feat: reverse shares (#86)

* add first concept * add reverse share funcionality to frontend * allow creator to limit share expiration * moved reverse share in seperate module * add table to manage reverse shares * delete complete share if reverse share was deleted * optimize function names * add db migration * enable reverse share email notifications * fix config variable descriptions * fix migration for new installations
2024-06-30 06:30:11 +02:00 · 2023-01-26 13:44:04 +01:00 · 2023-01-26 13:44:04 +01:00 · 4a5fb549c6
commit 4a5fb549c6
parent 1ceb07b89e
43 changed files with 1456 additions and 280 deletions
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@ -62,7 +62,7 @@
        "eslint-plugin-prettier": "^4.2.1",
        "newman": "^5.3.2",
        "prettier": "^2.8.2",
-        "prisma": "^4.8.1",
+        "prisma": "^4.9.0",
        "source-map-support": "^0.5.21",
        "ts-loader": "^9.4.2",
        "tsconfig-paths": "4.1.2",
@ -1010,9 +1010,9 @@
      }
    },
    "node_modules/@prisma/engines": {
-      "version": "4.8.1",
-      "resolved": "https://registry.npmjs.org/@prisma/engines/-/engines-4.8.1.tgz",
-      "integrity": "sha512-93tctjNXcIS+i/e552IO6tqw17sX8liivv8WX9lDMCpEEe3ci+nT9F+1oHtAafqruXLepKF80i/D20Mm+ESlOw==",
+      "version": "4.9.0",
+      "resolved": "https://registry.npmjs.org/@prisma/engines/-/engines-4.9.0.tgz",
+      "integrity": "sha512-t1pt0Gsp+HcgPJrHFc+d/ZSAaKKWar2G/iakrE07yeKPNavDP3iVKPpfXP22OTCHZUWf7OelwKJxQgKAm5hkgw==",
      "devOptional": true,
      "hasInstallScript": true
    },
@ -5871,13 +5871,13 @@
      }
    },
    "node_modules/prisma": {
-      "version": "4.8.1",
-      "resolved": "https://registry.npmjs.org/prisma/-/prisma-4.8.1.tgz",
-      "integrity": "sha512-ZMLnSjwulIeYfaU1O6/LF6PEJzxN5par5weykxMykS9Z6ara/j76JH3Yo2AH3bgJbPN4Z6NeCK9s5fDkzf33cg==",
+      "version": "4.9.0",
+      "resolved": "https://registry.npmjs.org/prisma/-/prisma-4.9.0.tgz",
+      "integrity": "sha512-bS96oZ5oDFXYgoF2l7PJ3Mp1wWWfLOo8B/jAfbA2Pn0Wm5Z/owBHzaMQKS3i1CzVBDWWPVnOohmbJmjvkcHS5w==",
      "devOptional": true,
      "hasInstallScript": true,
      "dependencies": {
-        "@prisma/engines": "4.8.1"
+        "@prisma/engines": "4.9.0"
      },
      "bin": {
        "prisma": "build/index.js",
@ -8255,9 +8255,9 @@
      }
    },
    "@prisma/engines": {
-      "version": "4.8.1",
-      "resolved": "https://registry.npmjs.org/@prisma/engines/-/engines-4.8.1.tgz",
-      "integrity": "sha512-93tctjNXcIS+i/e552IO6tqw17sX8liivv8WX9lDMCpEEe3ci+nT9F+1oHtAafqruXLepKF80i/D20Mm+ESlOw==",
+      "version": "4.9.0",
+      "resolved": "https://registry.npmjs.org/@prisma/engines/-/engines-4.9.0.tgz",
+      "integrity": "sha512-t1pt0Gsp+HcgPJrHFc+d/ZSAaKKWar2G/iakrE07yeKPNavDP3iVKPpfXP22OTCHZUWf7OelwKJxQgKAm5hkgw==",
      "devOptional": true
    },
    "@prisma/engines-version": {
@ -11995,12 +11995,12 @@
      }
    },
    "prisma": {
-      "version": "4.8.1",
-      "resolved": "https://registry.npmjs.org/prisma/-/prisma-4.8.1.tgz",
-      "integrity": "sha512-ZMLnSjwulIeYfaU1O6/LF6PEJzxN5par5weykxMykS9Z6ara/j76JH3Yo2AH3bgJbPN4Z6NeCK9s5fDkzf33cg==",
+      "version": "4.9.0",
+      "resolved": "https://registry.npmjs.org/prisma/-/prisma-4.9.0.tgz",
+      "integrity": "sha512-bS96oZ5oDFXYgoF2l7PJ3Mp1wWWfLOo8B/jAfbA2Pn0Wm5Z/owBHzaMQKS3i1CzVBDWWPVnOohmbJmjvkcHS5w==",
      "devOptional": true,
      "requires": {
-        "@prisma/engines": "4.8.1"
+        "@prisma/engines": "4.9.0"
      }
    },
    "process-nextick-args": {
--- a/backend/package.json
+++ b/backend/package.json
@ -67,7 +67,7 @@
    "eslint-plugin-prettier": "^4.2.1",
    "newman": "^5.3.2",
    "prettier": "^2.8.2",
-    "prisma": "^4.8.1",
+    "prisma": "^4.9.0",
    "source-map-support": "^0.5.21",
    "ts-loader": "^9.4.2",
    "tsconfig-paths": "4.1.2",
--- a/backend/prisma/migrations/20230126094911_reverse_share/migration.sql
+++ b/backend/prisma/migrations/20230126094911_reverse_share/migration.sql
@ -0,0 +1,91 @@
+/*
+  Warnings:
+
+  - The primary key for the `Config` table will be changed. If it partially fails, the table could be left without primary key constraint.
+  - Added the required column `id` to the `Config` table without a default value. This is not possible if the table is not empty.
+
+*/
+-- CreateTable
+CREATE TABLE "ReverseShare" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "token" TEXT NOT NULL,
+    "shareExpiration" DATETIME NOT NULL,
+    "maxShareSize" TEXT NOT NULL,
+    "sendEmailNotification" BOOLEAN NOT NULL,
+    "used" BOOLEAN NOT NULL DEFAULT false,
+    "creatorId" TEXT NOT NULL,
+    "shareId" TEXT,
+    CONSTRAINT "ReverseShare_creatorId_fkey" FOREIGN KEY ("creatorId") REFERENCES "User" ("id") ON DELETE CASCADE ON UPDATE CASCADE,
+    CONSTRAINT "ReverseShare_shareId_fkey" FOREIGN KEY ("shareId") REFERENCES "Share" ("id") ON DELETE CASCADE ON UPDATE CASCADE
+);
+
+-- RedefineTables
+PRAGMA foreign_keys=OFF;
+CREATE TABLE "new_Config" (
+    "id" INTEGER,
+    "updatedAt" DATETIME NOT NULL,
+    "key" TEXT NOT NULL,
+    "type" TEXT NOT NULL,
+    "value" TEXT NOT NULL,
+    "description" TEXT NOT NULL,
+    "category" TEXT NOT NULL,
+    "obscured" BOOLEAN NOT NULL DEFAULT false,
+    "secret" BOOLEAN NOT NULL DEFAULT true,
+    "locked" BOOLEAN NOT NULL DEFAULT false
+);
+INSERT INTO "new_Config" ("category", "description", "key", "locked", "obscured", "secret", "type", "updatedAt", "value") SELECT "category", "description", "key", "locked", "obscured", "secret", "type", "updatedAt", "value" FROM "Config";
+DROP TABLE "Config";
+ALTER TABLE "new_Config" RENAME TO "Config";
+PRAGMA foreign_key_check;
+PRAGMA foreign_keys=ON;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "ReverseShare_token_key" ON "ReverseShare"("token");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "ReverseShare_shareId_key" ON "ReverseShare"("shareId");
+
+
+-- Add ids to existing settings
+
+
+UPDATE Config SET id = 1 WHERE key = "SETUP_FINISHED";
+UPDATE Config SET id = 2 WHERE key = "APP_URL";
+UPDATE Config SET id = 3 WHERE key = "SHOW_HOME_PAGE";
+UPDATE Config SET id = 4 WHERE key = "ALLOW_REGISTRATION";
+UPDATE Config SET id = 5 WHERE key = "ALLOW_UNAUTHENTICATED_SHARES";
+UPDATE Config SET id = 6 WHERE key = "MAX_SHARE_SIZE";
+UPDATE Config SET id = 7 WHERE key = "JWT_SECRET";
+UPDATE Config SET id = 8 WHERE key = "TOTP_SECRET";
+UPDATE Config SET id = 9, key = "ENABLE_SHARE_EMAIL_RECIPIENTS" WHERE key = "ENABLE_EMAIL_RECIPIENTS";
+UPDATE Config SET id = 10, key = "SHARE_RECEPIENTS_EMAIL_MESSAGE" WHERE key = "EMAIL_MESSAGE";
+UPDATE Config SET id = 11, key = "SHARE_RECEPIENTS_EMAIL_SUBJECT" WHERE key = "EMAIL_SUBJECT";
+UPDATE Config SET id = 15 WHERE key = "SMTP_HOST";
+UPDATE Config SET id = 16 WHERE key = "SMTP_PORT";
+UPDATE Config SET id = 17 WHERE key = "SMTP_EMAIL";
+UPDATE Config SET id = 18 WHERE key = "SMTP_USERNAME";
+UPDATE Config SET id = 19 WHERE key = "SMTP_PASSWORD";
+
+INSERT INTO Config (`id`, `key`, `description`, `type`, `value`, `category`, `secret`, `updatedAt`) VALUES (14, "SMTP_ENABLED", "Whether SMTP is enabled. Only set this to true if you entered the host, port, email, user and password of your SMTP server.", "boolean", IFNULL((SELECT value FROM Config WHERE key="ENABLE_SHARE_EMAIL_RECIPIENTS"), "false"), "smtp", 0, strftime('%s', 'now'));
+
+PRAGMA foreign_keys=OFF;
+CREATE TABLE "new_Config" (
+    "id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    "updatedAt" DATETIME NOT NULL,
+    "key" TEXT NOT NULL,
+    "type" TEXT NOT NULL,
+    "value" TEXT NOT NULL,
+    "description" TEXT NOT NULL,
+    "category" TEXT NOT NULL,
+    "obscured" BOOLEAN NOT NULL DEFAULT false,
+    "secret" BOOLEAN NOT NULL DEFAULT true,
+    "locked" BOOLEAN NOT NULL DEFAULT false
+);
+INSERT INTO "new_Config" ("id", "category", "description", "key", "locked", "obscured", "secret", "type", "updatedAt", "value") SELECT "id", "category", "description", "key", "locked", "obscured", "secret", "type", "updatedAt", "value" FROM "Config";
+DROP TABLE "Config";
+ALTER TABLE "new_Config" RENAME TO "Config";
+DELETE from Config WHERE key="MAX_FILE_SIZE";
+CREATE UNIQUE INDEX "Config_key_key" ON "Config"("key");
+PRAGMA foreign_key_check;
+PRAGMA foreign_keys=ON;
--- a/backend/prisma/schema.prisma
+++ b/backend/prisma/schema.prisma
@ -20,6 +20,7 @@ model User {
  shares        Share[]
  refreshTokens RefreshToken[]
  loginTokens   LoginToken[]
+  reverseShares ReverseShare[]

  totpEnabled  Boolean @default(false)
  totpVerified Boolean @default(false)
@ -59,13 +60,33 @@ model Share {
  description   String?
  removedReason String?

-  creatorId  String?
-  creator    User?            @relation(fields: [creatorId], references: [id], onDelete: Cascade)
+  creatorId String?
+  creator   User?   @relation(fields: [creatorId], references: [id], onDelete: Cascade)
+
+  reverseShare ReverseShare?
+
  security   ShareSecurity?
  recipients ShareRecipient[]
  files      File[]
 }

+model ReverseShare {
+  id        String   @id @default(uuid())
+  createdAt DateTime @default(now())
+
+  token                 String   @unique @default(uuid())
+  shareExpiration       DateTime
+  maxShareSize          String
+  sendEmailNotification Boolean
+  used                  Boolean  @default(false)
+
+  creatorId String
+  creator   User   @relation(fields: [creatorId], references: [id], onDelete: Cascade)
+
+  shareId String? @unique
+  share   Share?  @relation(fields: [shareId], references: [id], onDelete: Cascade)
+}
+
 model ShareRecipient {
  id    String @id @default(uuid())
  email String
@ -97,9 +118,10 @@ model ShareSecurity {
 }

 model Config {
+  id        Int      @id
  updatedAt DateTime @updatedAt

-  key         String  @id
+  key         String  @unique
  type        String
  value       String
  description String
--- a/backend/prisma/seed/config.seed.ts
+++ b/backend/prisma/seed/config.seed.ts
@ -3,6 +3,7 @@ import * as crypto from "crypto";

 const configVariables: Prisma.ConfigCreateInput[] = [
  {
+    id: 1,
    key: "SETUP_FINISHED",
    description: "Whether the setup has been finished",
    type: "boolean",
@ -12,6 +13,7 @@ const configVariables: Prisma.ConfigCreateInput[] = [
    locked: true,
  },
  {
+    id: 2,
    key: "APP_URL",
    description: "On which URL Pingvin Share is available",
    type: "string",
@ -20,6 +22,7 @@ const configVariables: Prisma.ConfigCreateInput[] = [
    secret: false,
  },
  {
+    id: 3,
    key: "SHOW_HOME_PAGE",
    description: "Whether to show the home page",
    type: "boolean",
@ -28,6 +31,7 @@ const configVariables: Prisma.ConfigCreateInput[] = [
    secret: false,
  },
  {
+    id: 4,
    key: "ALLOW_REGISTRATION",
    description: "Whether registration is allowed",
    type: "boolean",
@ -36,6 +40,7 @@ const configVariables: Prisma.ConfigCreateInput[] = [
    secret: false,
  },
  {
+    id: 5,
    key: "ALLOW_UNAUTHENTICATED_SHARES",
    description: "Whether unauthorized users can create shares",
    type: "boolean",
@ -44,6 +49,8 @@ const configVariables: Prisma.ConfigCreateInput[] = [
    secret: false,
  },
  {
+    id: 6,
+
    key: "MAX_SHARE_SIZE",
    description: "Maximum share size in bytes",
    type: "number",
@ -52,6 +59,7 @@ const configVariables: Prisma.ConfigCreateInput[] = [
    secret: false,
  },
  {
+    id: 7,
    key: "JWT_SECRET",
    description: "Long random string used to sign JWT tokens",
    type: "string",
@ -60,6 +68,7 @@ const configVariables: Prisma.ConfigCreateInput[] = [
    locked: true,
  },
  {
+    id: 8,
    key: "TOTP_SECRET",
    description: "A 16 byte random string used to generate TOTP secrets",
    type: "string",
@ -68,65 +77,103 @@ const configVariables: Prisma.ConfigCreateInput[] = [
    locked: true,
  },
  {
-    key: "ENABLE_EMAIL_RECIPIENTS",
+    id: 9,
+    key: "ENABLE_SHARE_EMAIL_RECIPIENTS",
    description:
-      "Whether to send emails to recipients. Only set this to true if you entered the host, port, email, user and password of your SMTP server.",
+      "Whether to allow emails to share recipients. Only enable this if you have enabled SMTP.",
    type: "boolean",
    value: "false",
    category: "email",
    secret: false,
  },
  {
-    key: "EMAIL_MESSAGE",
+    id: 10,
+    key: "SHARE_RECEPIENTS_EMAIL_MESSAGE",
    description:
-      "Message which gets sent to the recipients. {creator} and {shareUrl} will be replaced with the creator's name and the share URL.",
+      "Message which gets sent to the share recipients. {creator} and {shareUrl} will be replaced with the creator's name and the share URL.",
    type: "text",
    value:
      "Hey!\n{creator} shared some files with you. View or download the files with this link: {shareUrl}\nShared securely with Pingvin Share 🐧",
-      category: "email",
+    category: "email",
  },
  {
-    key: "EMAIL_SUBJECT",
-    description: "Subject of the email which gets sent to the recipients.",
+    id: 11,
+    key: "SHARE_RECEPIENTS_EMAIL_SUBJECT",
+    description:
+      "Subject of the email which gets sent to the share recipients.",
    type: "string",
    value: "Files shared with you",
    category: "email",
  },
  {
+    id: 12,
+    key: "REVERSE_SHARE_EMAIL_MESSAGE",
+    description:
+      "Message which gets sent when someone created a share with your reverse share link. {shareUrl} will be replaced with the creator's name and the share URL.",
+    type: "text",
+    value:
+      "Hey!\nA share was just created with your reverse share link: {shareUrl}\nShared securely with Pingvin Share 🐧",
+    category: "email",
+  },
+  {
+    id: 13,
+    key: "REVERSE_SHARE_EMAIL_SUBJECT",
+    description:
+      "Subject of the email which gets sent when someone created a share with your reverse share link.",
+    type: "string",
+    value: "Reverse share link used",
+    category: "email",
+  },
+  {
+    id: 14,
+    key: "SMTP_ENABLED",
+    description:
+      "Whether SMTP is enabled. Only set this to true if you entered the host, port, email, user and password of your SMTP server.",
+    type: "boolean",
+    value: "false",
+    category: "smtp",
+    secret: false,
+  },
+  {
+    id: 15,
    key: "SMTP_HOST",
    description: "Host of the SMTP server",
    type: "string",
    value: "",
-  category: "email",
+    category: "smtp",
  },
  {
+    id: 16,
    key: "SMTP_PORT",
    description: "Port of the SMTP server",
    type: "number",
    value: "0",
-    category: "email",
+    category: "smtp",
  },
  {
+    id: 17,
    key: "SMTP_EMAIL",
    description: "Email address which the emails get sent from",
    type: "string",
    value: "",
-    category: "email",
+    category: "smtp",
  },
  {
+    id: 18,
    key: "SMTP_USERNAME",
    description: "Username of the SMTP server",
    type: "string",
    value: "",
-    category: "email",
+    category: "smtp",
  },
  {
+    id: 19,
    key: "SMTP_PASSWORD",
    description: "Password of the SMTP server",
    type: "string",
    value: "",
    obscured: true,
-    category: "email",
+    category: "smtp",
  },
 ];

--- a/backend/src/app.module.ts
+++ b/backend/src/app.module.ts
@ -13,6 +13,7 @@ import { PrismaModule } from "./prisma/prisma.module";
 import { ShareModule } from "./share/share.module";
 import { UserModule } from "./user/user.module";
 import { ClamScanModule } from "./clamscan/clamscan.module";
+import { ReverseShareModule } from "./reverseShare/reverseShare.module";

@Module({
  imports: [
@ -30,6 +31,7 @@ import { ClamScanModule } from "./clamscan/clamscan.module";
    }),
    ScheduleModule.forRoot(),
    ClamScanModule,
+    ReverseShareModule,
  ],
  providers: [
    {
--- a/backend/src/config/config.service.ts
+++ b/backend/src/config/config.service.ts
@ -29,6 +29,7 @@ export class ConfigService {

  async listForAdmin() {
    return await this.prisma.config.findMany({
+      orderBy: { id: "asc" },
      where: { locked: { equals: false } },
    });
  }
--- a/backend/src/email/email.service.ts
+++ b/backend/src/email/email.service.ts
@ -8,6 +8,9 @@ export class EmailService {
  constructor(private config: ConfigService) {}

  getTransporter() {
+    if (!this.config.get("SMTP_ENABLED"))
+      throw new InternalServerErrorException("SMTP is disabled");
+
    return nodemailer.createTransport({
      host: this.config.get("SMTP_HOST"),
      port: parseInt(this.config.get("SMTP_PORT")),
@ -19,8 +22,12 @@ export class EmailService {
    });
  }

-  async sendMail(recipientEmail: string, shareId: string, creator: User) {
-    if (!this.config.get("ENABLE_EMAIL_RECIPIENTS"))
+  async sendMailToShareRecepients(
+    recipientEmail: string,
+    shareId: string,
+    creator?: User
+  ) {
+    if (!this.config.get("ENABLE_SHARE_EMAIL_RECIPIENTS"))
      throw new InternalServerErrorException("Email service disabled");

    const shareUrl = `${this.config.get("APP_URL")}/share/${shareId}`;
@ -28,11 +35,25 @@ export class EmailService {
    await this.getTransporter().sendMail({
      from: `"Pingvin Share" <${this.config.get("SMTP_EMAIL")}>`,
      to: recipientEmail,
-      subject: this.config.get("EMAIL_SUBJECT"),
+      subject: this.config.get("SHARE_RECEPIENTS_EMAIL_SUBJECT"),
      text: this.config
-        .get("EMAIL_MESSAGE")
+        .get("SHARE_RECEPIENTS_EMAIL_MESSAGE")
+        .replaceAll("\\n", "\n")
+        .replaceAll("{creator}", creator?.username ?? "Someone")
+        .replaceAll("{shareUrl}", shareUrl),
+    });
+  }
+
+  async sendMailToReverseShareCreator(recipientEmail: string, shareId: string) {
+    const shareUrl = `${this.config.get("APP_URL")}/share/${shareId}`;
+
+    await this.getTransporter().sendMail({
+      from: `"Pingvin Share" <${this.config.get("SMTP_EMAIL")}>`,
+      to: recipientEmail,
+      subject: this.config.get("REVERSE_SHARE_EMAIL_SUBJECT"),
+      text: this.config
+        .get("REVERSE_SHARE_EMAIL_MESSAGE")
        .replaceAll("\\n", "\n")
-        .replaceAll("{creator}", creator.username)
        .replaceAll("{shareUrl}", shareUrl),
    });
  }
--- a/backend/src/file/file.controller.ts
+++ b/backend/src/file/file.controller.ts
@ -14,6 +14,7 @@ import * as contentDisposition from "content-disposition";
 import { Response } from "express";
 import { JwtGuard } from "src/auth/guard/jwt.guard";
 import { FileDownloadGuard } from "src/file/guard/fileDownload.guard";
+import { CreateShareGuard } from "src/share/guard/createShare.guard";
 import { ShareOwnerGuard } from "src/share/guard/shareOwner.guard";
 import { ShareSecurityGuard } from "src/share/guard/shareSecurity.guard";
 import { FileService } from "./file.service";
@ -24,7 +25,7 @@ export class FileController {

  @Post()
  @SkipThrottle()
-  @UseGuards(JwtGuard, ShareOwnerGuard)
+  @UseGuards(CreateShareGuard, ShareOwnerGuard)
  async create(
    @Query() query: any,

--- a/backend/src/file/file.module.ts
+++ b/backend/src/file/file.module.ts
@ -1,11 +1,12 @@
 import { Module } from "@nestjs/common";
 import { JwtModule } from "@nestjs/jwt";
+import { ReverseShareModule } from "src/reverseShare/reverseShare.module";
 import { ShareModule } from "src/share/share.module";
 import { FileController } from "./file.controller";
 import { FileService } from "./file.service";

@Module({
-  imports: [JwtModule.register({}), ShareModule],
+  imports: [JwtModule.register({}), ReverseShareModule, ShareModule],
  controllers: [FileController],
  providers: [FileService],
  exports: [FileService],
--- a/backend/src/file/file.service.ts
+++ b/backend/src/file/file.service.ts
@ -30,7 +30,7 @@ export class FileService {

    const share = await this.prisma.share.findUnique({
      where: { id: shareId },
-      include: { files: true },
+      include: { files: true, reverseShare: true },
    });

    if (share.uploadLocked)
@ -64,9 +64,12 @@ export class FileService {
      0
    );

+    const shareSizeSum = fileSizeSum + diskFileSize + buffer.byteLength;
+
    if (
-      fileSizeSum + diskFileSize + buffer.byteLength >
-      this.config.get("MAX_SHARE_SIZE")
+      shareSizeSum > this.config.get("MAX_SHARE_SIZE") ||
+      (share.reverseShare?.maxShareSize &&
+        shareSizeSum > parseInt(share.reverseShare.maxShareSize))
    ) {
      throw new HttpException(
        "Max share size exceeded",
--- a/backend/src/reverseShare/dto/createReverseShare.dto.ts
+++ b/backend/src/reverseShare/dto/createReverseShare.dto.ts
@ -0,0 +1,12 @@
+import { IsBoolean, IsString } from "class-validator";
+
+export class CreateReverseShareDTO {
+  @IsBoolean()
+  sendEmailNotification: boolean;
+
+  @IsString()
+  maxShareSize: string;
+
+  @IsString()
+  shareExpiration: string;
+}
--- a/backend/src/reverseShare/dto/reverseShare.dto.ts
+++ b/backend/src/reverseShare/dto/reverseShare.dto.ts
@ -0,0 +1,18 @@
+import { Expose, plainToClass } from "class-transformer";
+
+export class ReverseShareDTO {
+  @Expose()
+  id: string;
+
+  @Expose()
+  maxShareSize: string;
+
+  @Expose()
+  shareExpiration: Date;
+
+  from(partial: Partial<ReverseShareDTO>) {
+    return plainToClass(ReverseShareDTO, partial, {
+      excludeExtraneousValues: true,
+    });
+  }
+}
--- a/backend/src/reverseShare/dto/reverseShareTokenWithShare.ts
+++ b/backend/src/reverseShare/dto/reverseShareTokenWithShare.ts
@ -0,0 +1,23 @@
+import { OmitType } from "@nestjs/mapped-types";
+import { Expose, plainToClass, Type } from "class-transformer";
+import { MyShareDTO } from "src/share/dto/myShare.dto";
+import { ReverseShareDTO } from "./reverseShare.dto";
+
+export class ReverseShareTokenWithShare extends OmitType(ReverseShareDTO, [
+  "shareExpiration",
+] as const) {
+  @Expose()
+  shareExpiration: Date;
+
+  @Expose()
+  @Type(() => OmitType(MyShareDTO, ["recipients"] as const))
+  share: Omit<MyShareDTO, "recipients" | "files" | "from" | "fromList">;
+
+  fromList(partial: Partial<ReverseShareTokenWithShare>[]) {
+    return partial.map((part) =>
+      plainToClass(ReverseShareTokenWithShare, part, {
+        excludeExtraneousValues: true,
+      })
+    );
+  }
+}
--- a/backend/src/reverseShare/guards/reverseShareOwner.guard.ts
+++ b/backend/src/reverseShare/guards/reverseShareOwner.guard.ts
@ -0,0 +1,22 @@
+import { CanActivate, ExecutionContext, Injectable } from "@nestjs/common";
+import { User } from "@prisma/client";
+import { Request } from "express";
+import { PrismaService } from "src/prisma/prisma.service";
+
+@Injectable()
+export class ReverseShareOwnerGuard implements CanActivate {
+  constructor(private prisma: PrismaService) {}
+
+  async canActivate(context: ExecutionContext) {
+    const request: Request = context.switchToHttp().getRequest();
+    const { reverseShareId } = request.params;
+
+    const reverseShare = await this.prisma.reverseShare.findUnique({
+      where: { id: reverseShareId },
+    });
+
+    if (!reverseShare) return false;
+
+    return reverseShare.creatorId == (request.user as User).id;
+  }
+}
--- a/backend/src/reverseShare/reverseShare.controller.ts
+++ b/backend/src/reverseShare/reverseShare.controller.ts
@ -0,0 +1,64 @@
+import {
+  Body,
+  Controller,
+  Delete,
+  Get,
+  NotFoundException,
+  Param,
+  Post,
+  UseGuards,
+} from "@nestjs/common";
+import { Throttle } from "@nestjs/throttler";
+import { User } from "@prisma/client";
+import { GetUser } from "src/auth/decorator/getUser.decorator";
+import { JwtGuard } from "src/auth/guard/jwt.guard";
+import { ConfigService } from "src/config/config.service";
+import { CreateReverseShareDTO } from "./dto/createReverseShare.dto";
+import { ReverseShareDTO } from "./dto/reverseShare.dto";
+import { ReverseShareTokenWithShare } from "./dto/reverseShareTokenWithShare";
+import { ReverseShareOwnerGuard } from "./guards/reverseShareOwner.guard";
+import { ReverseShareService } from "./reverseShare.service";
+
+@Controller("reverseShares")
+export class ReverseShareController {
+  constructor(
+    private reverseShareService: ReverseShareService,
+    private config: ConfigService
+  ) {}
+
+  @Post()
+  @UseGuards(JwtGuard)
+  async create(@Body() body: CreateReverseShareDTO, @GetUser() user: User) {
+    const token = await this.reverseShareService.create(body, user.id);
+
+    const link = `${this.config.get("APP_URL")}/upload/${token}`;
+
+    return { token, link };
+  }
+
+  @Throttle(20, 60)
+  @Get(":reverseShareToken")
+  async getByToken(@Param("reverseShareToken") reverseShareToken: string) {
+    const isValid = await this.reverseShareService.isValid(reverseShareToken);
+
+    if (!isValid) throw new NotFoundException("Reverse share token not found");
+
+    return new ReverseShareDTO().from(
+      await this.reverseShareService.getByToken(reverseShareToken)
+    );
+  }
+
+  @Get()
+  @UseGuards(JwtGuard)
+  async getAllByUser(@GetUser() user: User) {
+    return new ReverseShareTokenWithShare().fromList(
+      await this.reverseShareService.getAllByUser(user.id)
+    );
+  }
+
+  @Delete(":reverseShareId")
+  @UseGuards(JwtGuard, ReverseShareOwnerGuard)
+  async remove(@Param("reverseShareId") id: string) {
+    await this.reverseShareService.remove(id);
+  }
+}
--- a/backend/src/reverseShare/reverseShare.module.ts
+++ b/backend/src/reverseShare/reverseShare.module.ts
@ -0,0 +1,12 @@
+import { forwardRef, Module } from "@nestjs/common";
+import { FileModule } from "src/file/file.module";
+import { ReverseShareController } from "./reverseShare.controller";
+import { ReverseShareService } from "./reverseShare.service";
+
+@Module({
+  imports: [forwardRef(() => FileModule)],
+  controllers: [ReverseShareController],
+  providers: [ReverseShareService],
+  exports: [ReverseShareService],
+})
+export class ReverseShareModule {}
--- a/backend/src/reverseShare/reverseShare.service.ts
+++ b/backend/src/reverseShare/reverseShare.service.ts
@ -0,0 +1,94 @@
+import { BadRequestException, Injectable } from "@nestjs/common";
+import * as moment from "moment";
+import { ConfigService } from "src/config/config.service";
+import { FileService } from "src/file/file.service";
+import { PrismaService } from "src/prisma/prisma.service";
+import { CreateReverseShareDTO } from "./dto/createReverseShare.dto";
+
+@Injectable()
+export class ReverseShareService {
+  constructor(
+    private config: ConfigService,
+    private prisma: PrismaService,
+    private fileService: FileService
+  ) {}
+
+  async create(data: CreateReverseShareDTO, creatorId: string) {
+    // Parse date string to date
+    const expirationDate = moment()
+      .add(
+        data.shareExpiration.split("-")[0],
+        data.shareExpiration.split(
+          "-"
+        )[1] as moment.unitOfTime.DurationConstructor
+      )
+      .toDate();
+
+    const globalMaxShareSize = this.config.get("MAX_SHARE_SIZE");
+
+    if (globalMaxShareSize < data.maxShareSize)
+      throw new BadRequestException(
+        `Max share size can't be greater than ${globalMaxShareSize} bytes.`
+      );
+
+    const reverseShare = await this.prisma.reverseShare.create({
+      data: {
+        shareExpiration: expirationDate,
+        maxShareSize: data.maxShareSize,
+        sendEmailNotification: data.sendEmailNotification,
+        creatorId,
+      },
+    });
+
+    return reverseShare.token;
+  }
+
+  async getByToken(reverseShareToken: string) {
+    const reverseShare = await this.prisma.reverseShare.findUnique({
+      where: { token: reverseShareToken },
+    });
+
+    return reverseShare;
+  }
+
+  async getAllByUser(userId: string) {
+    const reverseShares = await this.prisma.reverseShare.findMany({
+      where: {
+        creatorId: userId,
+        shareExpiration: { gt: new Date() },
+      },
+      orderBy: {
+        shareExpiration: "desc",
+      },
+      include: { share: { include: { creator: true } } },
+    });
+
+    return reverseShares;
+  }
+
+  async isValid(reverseShareToken: string) {
+    const reverseShare = await this.prisma.reverseShare.findUnique({
+      where: { token: reverseShareToken },
+    });
+
+    if (!reverseShare) return false;
+
+    const isExpired = new Date() > reverseShare.shareExpiration;
+    const isUsed = reverseShare.used;
+
+    return !(isExpired || isUsed);
+  }
+
+  async remove(id: string) {
+    const share = await this.prisma.share.findFirst({
+      where: { reverseShare: { id } },
+    });
+
+    if (share) {
+      await this.prisma.share.delete({ where: { id: share.id } });
+      await this.fileService.deleteAllFiles(share.id);
+    } else {
+      await this.prisma.reverseShare.delete({ where: { id } });
+    }
+  }
+}
--- a/backend/src/share/guard/createShare.guard.ts
+++ b/backend/src/share/guard/createShare.guard.ts
@ -0,0 +1,29 @@
+import { ExecutionContext, Injectable } from "@nestjs/common";
+import { JwtGuard } from "src/auth/guard/jwt.guard";
+import { ConfigService } from "src/config/config.service";
+import { ReverseShareService } from "src/reverseShare/reverseShare.service";
+
+@Injectable()
+export class CreateShareGuard extends JwtGuard {
+  constructor(
+    configService: ConfigService,
+    private reverseShareService: ReverseShareService
+  ) {
+    super(configService);
+  }
+
+  async canActivate(context: ExecutionContext): Promise<boolean> {
+    if (await super.canActivate(context)) return true;
+
+    const reverseShareTokenId = context.switchToHttp().getRequest()
+      .cookies.reverse_share_token;
+
+    if (!reverseShareTokenId) return false;
+
+    const isReverseShareTokenValid = await this.reverseShareService.isValid(
+      reverseShareTokenId
+    );
+
+    return isReverseShareTokenValid;
+  }
+}
--- a/backend/src/share/share.controller.ts
+++ b/backend/src/share/share.controller.ts
@ -6,24 +6,31 @@ import {
  HttpCode,
  Param,
  Post,
+  Req,
  UseGuards,
 } from "@nestjs/common";
 import { Throttle } from "@nestjs/throttler";
 import { User } from "@prisma/client";
+import { Request } from "express";
 import { GetUser } from "src/auth/decorator/getUser.decorator";
 import { JwtGuard } from "src/auth/guard/jwt.guard";
+import { ConfigService } from "src/config/config.service";
 import { CreateShareDTO } from "./dto/createShare.dto";
 import { MyShareDTO } from "./dto/myShare.dto";
 import { ShareDTO } from "./dto/share.dto";
 import { ShareMetaDataDTO } from "./dto/shareMetaData.dto";
 import { SharePasswordDto } from "./dto/sharePassword.dto";
+import { CreateShareGuard } from "./guard/createShare.guard";
 import { ShareOwnerGuard } from "./guard/shareOwner.guard";
 import { ShareSecurityGuard } from "./guard/shareSecurity.guard";
 import { ShareTokenSecurity } from "./guard/shareTokenSecurity.guard";
 import { ShareService } from "./share.service";
@Controller("shares")
 export class ShareController {
-  constructor(private shareService: ShareService) {}
+  constructor(
+    private shareService: ShareService,
+    private config: ConfigService
+  ) {}

  @Get()
  @UseGuards(JwtGuard)
@ -46,9 +53,16 @@ export class ShareController {
  }

  @Post()
-  @UseGuards(JwtGuard)
-  async create(@Body() body: CreateShareDTO, @GetUser() user: User) {
-    return new ShareDTO().from(await this.shareService.create(body, user));
+  @UseGuards(CreateShareGuard)
+  async create(
+    @Body() body: CreateShareDTO,
+    @Req() request: Request,
+    @GetUser() user: User
+  ) {
+    const { reverse_share_token } = request.cookies;
+    return new ShareDTO().from(
+      await this.shareService.create(body, user, reverse_share_token)
+    );
  }

  @Delete(":id")
@ -59,11 +73,15 @@ export class ShareController {

  @Post(":id/complete")
  @HttpCode(202)
-  @UseGuards(JwtGuard, ShareOwnerGuard)
-  async complete(@Param("id") id: string) {
-    return new ShareDTO().from(await this.shareService.complete(id));
+  @UseGuards(CreateShareGuard, ShareOwnerGuard)
+  async complete(@Param("id") id: string, @Req() request: Request) {
+    const { reverse_share_token } = request.cookies;
+    return new ShareDTO().from(
+      await this.shareService.complete(id, reverse_share_token)
+    );
  }

+  @Throttle(10, 60)
  @Get("isShareIdAvailable/:id")
  async isShareIdAvailable(@Param("id") id: string) {
    return this.shareService.isShareIdAvailable(id);
--- a/backend/src/share/share.module.ts
+++ b/backend/src/share/share.module.ts
@ -3,6 +3,7 @@ import { JwtModule } from "@nestjs/jwt";
 import { ClamScanModule } from "src/clamscan/clamscan.module";
 import { EmailModule } from "src/email/email.module";
 import { FileModule } from "src/file/file.module";
+import { ReverseShareModule } from "src/reverseShare/reverseShare.module";
 import { ShareController } from "./share.controller";
 import { ShareService } from "./share.service";

@ -11,6 +12,7 @@ import { ShareService } from "./share.service";
    JwtModule.register({}),
    EmailModule,
    ClamScanModule,
+    ReverseShareModule,
    forwardRef(() => FileModule),
  ],
  controllers: [ShareController],
--- a/backend/src/share/share.service.ts
+++ b/backend/src/share/share.service.ts
@ -15,6 +15,7 @@ import { ConfigService } from "src/config/config.service";
 import { EmailService } from "src/email/email.service";
 import { FileService } from "src/file/file.service";
 import { PrismaService } from "src/prisma/prisma.service";
+import { ReverseShareService } from "src/reverseShare/reverseShare.service";
 import { CreateShareDTO } from "./dto/createShare.dto";

@Injectable()
@ -25,10 +26,11 @@ export class ShareService {
    private emailService: EmailService,
    private config: ConfigService,
    private jwtService: JwtService,
+    private reverseShareService: ReverseShareService,
    private clamScanService: ClamScanService
  ) {}

-  async create(share: CreateShareDTO, user?: User) {
+  async create(share: CreateShareDTO, user?: User, reverseShareToken?: string) {
    if (!(await this.isShareIdAvailable(share.id)).isAvailable)
      throw new BadRequestException("Share id already in use");

@ -39,30 +41,36 @@ export class ShareService {
      share.security.password = await argon.hash(share.security.password);
    }

-    // We have to add an exception for "never" (since moment won't like that)
    let expirationDate: Date;
-    if (share.expiration !== "never") {
-      expirationDate = moment()
-        .add(
-          share.expiration.split("-")[0],
-          share.expiration.split(
-            "-"
-          )[1] as moment.unitOfTime.DurationConstructor
-        )
-        .toDate();

-      // Throw error if expiration date is now
-      if (expirationDate.setMilliseconds(0) == new Date().setMilliseconds(0))
-        throw new BadRequestException("Invalid expiration date");
+    // If share is created by a reverse share token override the expiration date
+    if (reverseShareToken) {
+      const { shareExpiration } = await this.reverseShareService.getByToken(
+        reverseShareToken
+      );
+
+      expirationDate = shareExpiration;
    } else {
-      expirationDate = moment(0).toDate();
+      // We have to add an exception for "never" (since moment won't like that)
+      if (share.expiration !== "never") {
+        expirationDate = moment()
+          .add(
+            share.expiration.split("-")[0],
+            share.expiration.split(
+              "-"
+            )[1] as moment.unitOfTime.DurationConstructor
+          )
+          .toDate();
+      } else {
+        expirationDate = moment(0).toDate();
+      }
    }

    fs.mkdirSync(`./data/uploads/shares/${share.id}`, {
      recursive: true,
    });

-    return await this.prisma.share.create({
+    const shareTuple = await this.prisma.share.create({
      data: {
        ...share,
        expiration: expirationDate,
@ -75,6 +83,18 @@ export class ShareService {
        },
      },
    });
+
+    if (reverseShareToken) {
+      // Assign share to reverse share token
+      await this.prisma.reverseShare.update({
+        where: { token: reverseShareToken },
+        data: {
+          shareId: share.id,
+        },
+      });
+    }
+
+    return shareTuple;
  }

  async createZip(shareId: string) {
@ -96,10 +116,15 @@ export class ShareService {
    await archive.finalize();
  }

-  async complete(id: string) {
+  async complete(id: string, reverseShareToken?: string) {
    const share = await this.prisma.share.findUnique({
      where: { id },
-      include: { files: true, recipients: true, creator: true },
+      include: {
+        files: true,
+        recipients: true,
+        creator: true,
+        reverseShare: { include: { creator: true } },
+      },
    });

    if (await this.isShareCompleted(id))
@ -118,16 +143,34 @@ export class ShareService {

    // Send email for each recepient
    for (const recepient of share.recipients) {
-      await this.emailService.sendMail(
+      await this.emailService.sendMailToShareRecepients(
        recepient.email,
        share.id,
        share.creator
      );
    }

+    if (
+      share.reverseShare &&
+      this.config.get("SMTP_ENABLED") &&
+      share.reverseShare.sendEmailNotification
+    ) {
+      await this.emailService.sendMailToReverseShareCreator(
+        share.reverseShare.creator.email,
+        share.id
+      );
+    }
+
    // Check if any file is malicious with ClamAV
    this.clamScanService.checkAndRemove(share.id);

+    if (reverseShareToken) {
+      await this.prisma.reverseShare.update({
+        where: { token: reverseShareToken },
+        data: { used: true },
+      });
+    }
+
    return await this.prisma.share.update({
      where: { id },
      data: { uploadLocked: true },
--- a/frontend/src/components/admin/configuration/AdminConfigTable.tsx
+++ b/frontend/src/components/admin/configuration/AdminConfigTable.tsx
@ -100,7 +100,7 @@ const AdminConfigTable = () => {
                  <Space h="lg" />
                </>
              ))}
-              {category == "email" && (
+              {category == "smtp" && (
                <Group position="right">
                  <TestEmailButton />
                </Group>
--- a/frontend/src/components/navBar/ActionAvatar.tsx
+++ b/frontend/src/components/navBar/ActionAvatar.tsx
@ -1,6 +1,6 @@
 import { ActionIcon, Avatar, Menu } from "@mantine/core";
 import Link from "next/link";
-import { TbDoorExit, TbLink, TbSettings, TbUser } from "react-icons/tb";
+import { TbDoorExit, TbSettings, TbUser } from "react-icons/tb";
 import useUser from "../../hooks/user.hook";
 import authService from "../../services/auth.service";

@ -11,17 +11,10 @@ const ActionAvatar = () => {
    <Menu position="bottom-start" withinPortal>
      <Menu.Target>
        <ActionIcon>
-          <Avatar size={28} radius="xl" />
+          <Avatar size={28} />
        </ActionIcon>
      </Menu.Target>
      <Menu.Dropdown>
-        <Menu.Item
-          component={Link}
-          href="/account/shares"
-          icon={<TbLink size={14} />}
-        >
-          My shares
-        </Menu.Item>
        <Menu.Item component={Link} href="/account" icon={<TbUser size={14} />}>
          My account
        </Menu.Item>
--- a/frontend/src/components/navBar/NavBar.tsx
+++ b/frontend/src/components/navBar/NavBar.tsx
@ -1,4 +1,5 @@
 import {
+  ActionIcon,
  Box,
  Burger,
  Container,
@ -13,10 +14,12 @@ import {
 import { useDisclosure } from "@mantine/hooks";
 import Link from "next/link";
 import { ReactNode, useEffect, useState } from "react";
+import { TbPlus } from "react-icons/tb";
 import useConfig from "../../hooks/config.hook";
 import useUser from "../../hooks/user.hook";
 import Logo from "../Logo";
 import ActionAvatar from "./ActionAvatar";
+import NavbarShareMenu from "./NavbarShareMenu";

 const HEADER_HEIGHT = 60;

@ -117,6 +120,9 @@ const NavBar = () => {
      link: "/upload",
      label: "Upload",
    },
+    {
+      component: <NavbarShareMenu />,
+    },
    {
      component: <ActionAvatar />,
    },
--- a/frontend/src/components/navBar/NavbarShareMenu.tsx
+++ b/frontend/src/components/navBar/NavbarShareMenu.tsx
@ -0,0 +1,29 @@
+import { ActionIcon, Menu } from "@mantine/core";
+import Link from "next/link";
+import { TbArrowLoopLeft, TbLink } from "react-icons/tb";
+
+const NavbarShareMneu = () => {
+  return (
+    <Menu position="bottom-start" withinPortal>
+      <Menu.Target>
+        <ActionIcon>
+          <TbLink />
+        </ActionIcon>
+      </Menu.Target>
+      <Menu.Dropdown>
+        <Menu.Item component={Link} href="/account/shares" icon={<TbLink />}>
+          My shares
+        </Menu.Item>
+        <Menu.Item
+          component={Link}
+          href="/account/reverseShares"
+          icon={<TbArrowLoopLeft />}
+        >
+          Reverse shares
+        </Menu.Item>
+      </Menu.Dropdown>
+    </Menu>
+  );
+};
+
+export default NavbarShareMneu;
--- a/frontend/src/components/share/FileList.tsx
+++ b/frontend/src/components/share/FileList.tsx
@ -2,7 +2,7 @@ import { ActionIcon, Loader, Skeleton, Table } from "@mantine/core";
 import { TbCircleCheck, TbDownload } from "react-icons/tb";
 import shareService from "../../services/share.service";

-import { byteStringToHumanSizeString } from "../../utils/math/byteStringToHumanSizeString.util";
+import { byteToHumanSizeString } from "../../utils/fileSize.util";

 const FileList = ({
  files,
@ -28,7 +28,7 @@ const FileList = ({
          : files!.map((file) => (
              <tr key={file.name}>
                <td>{file.name}</td>
-                <td>{byteStringToHumanSizeString(file.size)}</td>
+                <td>{byteToHumanSizeString(file.size)}</td>
                <td>
                  {file.uploadingState ? (
                    file.uploadingState != "finished" ? (
--- a/frontend/src/components/share/FileSizeInput.tsx
+++ b/frontend/src/components/share/FileSizeInput.tsx
@ -0,0 +1,62 @@
+import { Col, Grid, NumberInput, Select } from "@mantine/core";
+import { useEffect, useState } from "react";
+import {
+  byteToUnitAndSize,
+  unitAndSizeToByte,
+} from "../../utils/fileSize.util";
+
+const FileSizeInput = ({
+  label,
+  value,
+  onChange,
+}: {
+  label: string;
+  value: number;
+  onChange: (number: number) => void;
+}) => {
+  const [unit, setUnit] = useState("MB");
+  const [size, setSize] = useState(100);
+
+  useEffect(() => {
+    const { unit, size } = byteToUnitAndSize(value);
+    setUnit(unit);
+    setSize(size);
+  }, [value]);
+
+  return (
+    <Grid align="flex-end">
+      <Col xs={6}>
+        <NumberInput
+          min={1}
+          max={99999}
+          precision={0}
+          variant="filled"
+          label={label}
+          value={size}
+          onChange={(value) => {
+            setSize(value!);
+            onChange(unitAndSizeToByte(unit, value!));
+          }}
+        />
+      </Col>
+      <Col xs={6}>
+        <Select
+          data={[
+            { label: "B", value: "B" },
+            { label: "KB", value: "KB" },
+            { label: "MB", value: "MB" },
+            { label: "GB", value: "GB" },
+            { label: "TB", value: "TB" },
+          ]}
+          value={unit}
+          onChange={(value) => {
+            setUnit(value!);
+            onChange(unitAndSizeToByte(value!, size));
+          }}
+        />
+      </Col>
+    </Grid>
+  );
+};
+
+export default FileSizeInput;
--- a/frontend/src/components/share/modals/showCompletedReverseShareModal.tsx
+++ b/frontend/src/components/share/modals/showCompletedReverseShareModal.tsx
@ -0,0 +1,68 @@
+import { ActionIcon, Button, Stack, TextInput, Title } from "@mantine/core";
+import { useClipboard } from "@mantine/hooks";
+import { useModals } from "@mantine/modals";
+import { ModalsContextProps } from "@mantine/modals/lib/context";
+import { TbCopy } from "react-icons/tb";
+import toast from "../../../utils/toast.util";
+
+const showCompletedReverseShareModal = (
+  modals: ModalsContextProps,
+  link: string,
+  getReverseShares: () => void
+) => {
+  return modals.openModal({
+    closeOnClickOutside: false,
+    withCloseButton: false,
+    closeOnEscape: false,
+    title: (
+      <Stack align="stretch" spacing={0}>
+        <Title order={4}>Reverse share link</Title>
+      </Stack>
+    ),
+    children: <Body link={link} getReverseShares={getReverseShares} />,
+  });
+};
+
+const Body = ({
+  link,
+  getReverseShares,
+}: {
+  link: string;
+  getReverseShares: () => void;
+}) => {
+  const clipboard = useClipboard({ timeout: 500 });
+  const modals = useModals();
+
+  return (
+    <Stack align="stretch">
+      <TextInput
+        readOnly
+        variant="filled"
+        value={link}
+        rightSection={
+          window.isSecureContext && (
+            <ActionIcon
+              onClick={() => {
+                clipboard.copy(link);
+                toast.success("Your link was copied to the keyboard.");
+              }}
+            >
+              <TbCopy />
+            </ActionIcon>
+          )
+        }
+      />
+
+      <Button
+        onClick={() => {
+          modals.closeAll();
+          getReverseShares();
+        }}
+      >
+        Done
+      </Button>
+    </Stack>
+  );
+};
+
+export default showCompletedReverseShareModal;
--- a/frontend/src/components/share/modals/showCreateReverseShareModal.tsx
+++ b/frontend/src/components/share/modals/showCreateReverseShareModal.tsx
@ -0,0 +1,156 @@
+import {
+  Button,
+  Col,
+  Grid,
+  Group,
+  NumberInput,
+  Select,
+  Stack,
+  Switch,
+  Text,
+  Title,
+} from "@mantine/core";
+import { useForm } from "@mantine/form";
+import { useModals } from "@mantine/modals";
+import { ModalsContextProps } from "@mantine/modals/lib/context";
+import shareService from "../../../services/share.service";
+import { getExpirationPreview } from "../../../utils/date.util";
+import toast from "../../../utils/toast.util";
+import FileSizeInput from "../FileSizeInput";
+import showCompletedReverseShareModal from "./showCompletedReverseShareModal";
+
+const showCreateReverseShareModal = (
+  modals: ModalsContextProps,
+  showSendEmailNotificationOption: boolean,
+  getReverseShares: () => void
+) => {
+  return modals.openModal({
+    title: <Title order={4}>Create reverse share</Title>,
+    children: (
+      <Body
+        showSendEmailNotificationOption={showSendEmailNotificationOption}
+        getReverseShares={getReverseShares}
+      />
+    ),
+  });
+};
+
+const Body = ({
+  getReverseShares,
+  showSendEmailNotificationOption,
+}: {
+  getReverseShares: () => void;
+  showSendEmailNotificationOption: boolean;
+}) => {
+  const modals = useModals();
+
+  const form = useForm({
+    initialValues: {
+      maxShareSize: 104857600,
+      sendEmailNotification: false,
+      expiration_num: 1,
+      expiration_unit: "-days",
+    },
+  });
+  return (
+    <Group>
+      <form
+        onSubmit={form.onSubmit(async (values) => {
+          shareService
+            .createReverseShare(
+              values.expiration_num + values.expiration_unit,
+              values.maxShareSize,
+              values.sendEmailNotification
+            )
+            .then(({ link }) => {
+              modals.closeAll();
+              showCompletedReverseShareModal(modals, link, getReverseShares);
+            })
+            .catch(toast.axiosError);
+        })}
+      >
+        <Stack align="stretch">
+          <div>
+            <Grid align={form.errors.link ? "center" : "flex-end"}>
+              <Col xs={6}>
+                <NumberInput
+                  min={1}
+                  max={99999}
+                  precision={0}
+                  variant="filled"
+                  label="Share expiration"
+                  {...form.getInputProps("expiration_num")}
+                />
+              </Col>
+              <Col xs={6}>
+                <Select
+                  {...form.getInputProps("expiration_unit")}
+                  data={[
+                    // Set the label to singular if the number is 1, else plural
+                    {
+                      value: "-minutes",
+                      label:
+                        "Minute" + (form.values.expiration_num == 1 ? "" : "s"),
+                    },
+                    {
+                      value: "-hours",
+                      label:
+                        "Hour" + (form.values.expiration_num == 1 ? "" : "s"),
+                    },
+                    {
+                      value: "-days",
+                      label:
+                        "Day" + (form.values.expiration_num == 1 ? "" : "s"),
+                    },
+                    {
+                      value: "-weeks",
+                      label:
+                        "Week" + (form.values.expiration_num == 1 ? "" : "s"),
+                    },
+                    {
+                      value: "-months",
+                      label:
+                        "Month" + (form.values.expiration_num == 1 ? "" : "s"),
+                    },
+                  ]}
+                />
+              </Col>
+            </Grid>
+            <Text
+              mt="sm"
+              italic
+              size="xs"
+              sx={(theme) => ({
+                color: theme.colors.gray[6],
+              })}
+            >
+              {getExpirationPreview("reverse share", form)}
+            </Text>
+          </div>
+          <FileSizeInput
+            label="Max share size"
+            value={form.values.maxShareSize}
+            onChange={(number) => form.setFieldValue("maxShareSize", number)}
+          />
+          {showSendEmailNotificationOption && (
+            <Switch
+              mt="xs"
+              labelPosition="left"
+              label="Send email notification"
+              description="Send an email notification when a share is created with this reverse share link"
+              {...form.getInputProps("sendEmailNotification", {
+                type: "checkbox",
+              })}
+            />
+          )}
+
+          <Button mt="md" type="submit">
+            Create
+          </Button>
+        </Stack>
+      </form>
+    </Group>
+  );
+};
+
+export default showCreateReverseShareModal;
--- a/frontend/src/components/upload/Dropzone.tsx
+++ b/frontend/src/components/upload/Dropzone.tsx
@ -4,7 +4,7 @@ import { Dispatch, ForwardedRef, SetStateAction, useRef } from "react";
 import { TbCloudUpload, TbUpload } from "react-icons/tb";
 import useConfig from "../../hooks/config.hook";
 import { FileUpload } from "../../types/File.type";
-import { byteStringToHumanSizeString } from "../../utils/math/byteStringToHumanSizeString.util";
+import { byteToHumanSizeString } from "../../utils/fileSize.util";
 import toast from "../../utils/toast.util";

 const useStyles = createStyles((theme) => ({
@ -33,10 +33,12 @@ const useStyles = createStyles((theme) => ({

 const Dropzone = ({
  isUploading,
+  maxShareSize,
  files,
  setFiles,
 }: {
  isUploading: boolean;
+  maxShareSize: number;
  files: FileUpload[];
  setFiles: Dispatch<SetStateAction<FileUpload[]>>;
 }) => {
@ -58,10 +60,10 @@ const Dropzone = ({
            0
          );

-          if (fileSizeSum > config.get("MAX_SHARE_SIZE")) {
+          if (fileSizeSum > maxShareSize) {
            toast.error(
-              `Your files exceed the maximum share size of ${byteStringToHumanSizeString(
-                config.get("MAX_SHARE_SIZE")
+              `Your files exceed the maximum share size of ${byteToHumanSizeString(
+                maxShareSize
              )}.`
            );
          } else {
@ -84,9 +86,8 @@ const Dropzone = ({
          </Text>
          <Text align="center" size="sm" mt="xs" color="dimmed">
            Drag&apos;n&apos;drop files here to start your share. We can accept
-            only files that are less than{" "}
-            {byteStringToHumanSizeString(config.get("MAX_SHARE_SIZE"))} in
-            total.
+            only files that are less than {byteToHumanSizeString(maxShareSize)}{" "}
+            in total.
          </Text>
        </div>
      </MantineDropzone>
--- a/frontend/src/components/upload/ExpirationPreview.tsx
+++ b/frontend/src/components/upload/ExpirationPreview.tsx
@ -1,19 +0,0 @@
-import moment from "moment";
-
-const ExpirationPreview = ({ form }: { form: any }) => {
-  const value = form.values.never_expires
-    ? "never"
-    : form.values.expiration_num + form.values.expiration_unit;
-  if (value === "never") return "This share will never expire.";
-
-  const expirationDate = moment()
-    .add(
-      value.split("-")[0],
-      value.split("-")[1] as moment.unitOfTime.DurationConstructor
-    )
-    .toDate();
-
-  return `This share will expire on ${moment(expirationDate).format("LLL")}`;
-};
-
-export default ExpirationPreview;
--- a/frontend/src/components/upload/FileList.tsx
+++ b/frontend/src/components/upload/FileList.tsx
@ -2,7 +2,7 @@ import { ActionIcon, Table } from "@mantine/core";
 import { Dispatch, SetStateAction } from "react";
 import { TbTrash } from "react-icons/tb";
 import { FileUpload } from "../../types/File.type";
-import { byteStringToHumanSizeString } from "../../utils/math/byteStringToHumanSizeString.util";
+import { byteToHumanSizeString } from "../../utils/fileSize.util";
 import UploadProgressIndicator from "./UploadProgressIndicator";

 const FileList = ({
@ -19,7 +19,7 @@ const FileList = ({
  const rows = files.map((file, i) => (
    <tr key={i}>
      <td>{file.name}</td>
-      <td>{byteStringToHumanSizeString(file.size.toString())}</td>
+      <td>{byteToHumanSizeString(file.size)}</td>
      <td>
        {file.uploadingProgress == 0 ? (
          <ActionIcon
--- a/frontend/src/components/upload/modals/showCreateUploadModal.tsx
+++ b/frontend/src/components/upload/modals/showCreateUploadModal.tsx
@ -5,7 +5,6 @@ import {
  Checkbox,
  Col,
  Grid,
-  Group,
  MultiSelect,
  NumberInput,
  PasswordInput,
@ -24,12 +23,13 @@ import { TbAlertCircle } from "react-icons/tb";
 import * as yup from "yup";
 import shareService from "../../../services/share.service";
 import { CreateShare } from "../../../types/share.type";
-import ExpirationPreview from "../ExpirationPreview";
+import { getExpirationPreview } from "../../../utils/date.util";

 const showCreateUploadModal = (
  modals: ModalsContextProps,
  options: {
    isUserSignedIn: boolean;
+    isReverseShare: boolean;
    appUrl: string;
    allowUnauthenticatedShares: boolean;
    enableEmailRecepients: boolean;
@ -54,6 +54,7 @@ const CreateUploadModalBody = ({
  uploadCallback: (createShare: CreateShare) => void;
  options: {
    isUserSignedIn: boolean;
+    isReverseShare: boolean;
    appUrl: string;
    allowUnauthenticatedShares: boolean;
    enableEmailRecepients: boolean;
@ -89,7 +90,7 @@ const CreateUploadModalBody = ({
    validate: yupResolver(validationSchema),
  });
  return (
-    <Group>
+    <>
      {showNotSignedInAlert && !options.isUserSignedIn && (
        <Alert
          withCloseButton
@ -161,72 +162,78 @@ const CreateUploadModalBody = ({
            {options.appUrl}/share/
            {form.values.link == "" ? "myAwesomeShare" : form.values.link}
          </Text>
-          <Grid align={form.errors.link ? "center" : "flex-end"}>
-            <Col xs={6}>
-              <NumberInput
-                min={1}
-                max={99999}
-                precision={0}
-                variant="filled"
-                label="Expiration"
-                placeholder="n"
-                disabled={form.values.never_expires}
-                {...form.getInputProps("expiration_num")}
+          {!options.isReverseShare && (
+            <>
+              <Grid align={form.errors.link ? "center" : "flex-end"}>
+                <Col xs={6}>
+                  <NumberInput
+                    min={1}
+                    max={99999}
+                    precision={0}
+                    variant="filled"
+                    label="Expiration"
+                    placeholder="n"
+                    disabled={form.values.never_expires}
+                    {...form.getInputProps("expiration_num")}
+                  />
+                </Col>
+                <Col xs={6}>
+                  <Select
+                    disabled={form.values.never_expires}
+                    {...form.getInputProps("expiration_unit")}
+                    data={[
+                      // Set the label to singular if the number is 1, else plural
+                      {
+                        value: "-minutes",
+                        label:
+                          "Minute" +
+                          (form.values.expiration_num == 1 ? "" : "s"),
+                      },
+                      {
+                        value: "-hours",
+                        label:
+                          "Hour" + (form.values.expiration_num == 1 ? "" : "s"),
+                      },
+                      {
+                        value: "-days",
+                        label:
+                          "Day" + (form.values.expiration_num == 1 ? "" : "s"),
+                      },
+                      {
+                        value: "-weeks",
+                        label:
+                          "Week" + (form.values.expiration_num == 1 ? "" : "s"),
+                      },
+                      {
+                        value: "-months",
+                        label:
+                          "Month" +
+                          (form.values.expiration_num == 1 ? "" : "s"),
+                      },
+                      {
+                        value: "-years",
+                        label:
+                          "Year" + (form.values.expiration_num == 1 ? "" : "s"),
+                      },
+                    ]}
+                  />
+                </Col>
+              </Grid>
+              <Checkbox
+                label="Never Expires"
+                {...form.getInputProps("never_expires")}
              />
-            </Col>
-            <Col xs={6}>
-              <Select
-                disabled={form.values.never_expires}
-                {...form.getInputProps("expiration_unit")}
-                data={[
-                  // Set the label to singular if the number is 1, else plural
-                  {
-                    value: "-minutes",
-                    label:
-                      "Minute" + (form.values.expiration_num == 1 ? "" : "s"),
-                  },
-                  {
-                    value: "-hours",
-                    label:
-                      "Hour" + (form.values.expiration_num == 1 ? "" : "s"),
-                  },
-                  {
-                    value: "-days",
-                    label: "Day" + (form.values.expiration_num == 1 ? "" : "s"),
-                  },
-                  {
-                    value: "-weeks",
-                    label:
-                      "Week" + (form.values.expiration_num == 1 ? "" : "s"),
-                  },
-                  {
-                    value: "-months",
-                    label:
-                      "Month" + (form.values.expiration_num == 1 ? "" : "s"),
-                  },
-                  {
-                    value: "-years",
-                    label:
-                      "Year" + (form.values.expiration_num == 1 ? "" : "s"),
-                  },
-                ]}
-              />
-            </Col>
-          </Grid>
-          <Checkbox
-            label="Never Expires"
-            {...form.getInputProps("never_expires")}
-          />
-          {/* Preview expiration date text */}
-          <Text
-            italic
-            size="xs"
-            sx={(theme) => ({
-              color: theme.colors.gray[6],
-            })}
-          >
-            {ExpirationPreview({ form })}
-          </Text>
+              <Text
+                italic
+                size="xs"
+                sx={(theme) => ({
+                  color: theme.colors.gray[6],
+                })}
+              >
+                {getExpirationPreview("share", form)}
+              </Text>
+            </>
+          )}
          <Accordion>
            <Accordion.Item value="description" sx={{ borderBottom: "none" }}>
              <Accordion.Control>Description</Accordion.Control>
@ -296,7 +303,7 @@ const CreateUploadModalBody = ({
          <Button type="submit">Share</Button>
        </Stack>
      </form>
-    </Group>
+    </>
  );
 };

--- a/frontend/src/pages/account/reverseShares.tsx
+++ b/frontend/src/pages/account/reverseShares.tsx
@ -0,0 +1,200 @@
+import {
+  ActionIcon,
+  Box,
+  Button,
+  Center,
+  Group,
+  LoadingOverlay,
+  Stack,
+  Table,
+  Text,
+  Title,
+  Tooltip,
+} from "@mantine/core";
+import { useClipboard } from "@mantine/hooks";
+import { useModals } from "@mantine/modals";
+import moment from "moment";
+import { useRouter } from "next/router";
+import { useEffect, useState } from "react";
+import { TbInfoCircle, TbLink, TbPlus, TbTrash } from "react-icons/tb";
+import showShareLinkModal from "../../components/account/showShareLinkModal";
+import Meta from "../../components/Meta";
+import showCreateReverseShareModal from "../../components/share/modals/showCreateReverseShareModal";
+import useConfig from "../../hooks/config.hook";
+import useUser from "../../hooks/user.hook";
+import shareService from "../../services/share.service";
+import { MyReverseShare } from "../../types/share.type";
+import { byteToHumanSizeString } from "../../utils/fileSize.util";
+import toast from "../../utils/toast.util";
+
+const MyShares = () => {
+  const modals = useModals();
+  const clipboard = useClipboard();
+  const router = useRouter();
+  const config = useConfig();
+
+  const { user } = useUser();
+
+  const [reverseShares, setReverseShares] = useState<MyReverseShare[]>();
+
+  const getReverseShares = () => {
+    shareService
+      .getMyReverseShares()
+      .then((shares) => setReverseShares(shares));
+  };
+
+  useEffect(() => {
+    getReverseShares();
+  }, []);
+
+  if (!user) {
+    router.replace("/");
+  } else {
+    if (!reverseShares) return <LoadingOverlay visible />;
+    return (
+      <>
+        <Meta title="My shares" />
+        <Group position="apart" align="baseline" mb={20}>
+          <Group align="center" spacing={3} mb={30}>
+            <Title order={3}>My reverse shares</Title>
+            <Tooltip
+              position="bottom"
+              multiline
+              width={220}
+              label="A reverse share allows you to generate a unique URL for a single-use share for an external user."
+              events={{ hover: true, focus: false, touch: true }}
+            >
+              <ActionIcon>
+                <TbInfoCircle />
+              </ActionIcon>
+            </Tooltip>
+          </Group>
+          <Button
+            onClick={() =>
+              showCreateReverseShareModal(
+                modals,
+                config.get("SMTP_ENABLED"),
+                getReverseShares
+              )
+            }
+            leftIcon={<TbPlus size={20} />}
+          >
+            Create
+          </Button>
+        </Group>
+        {reverseShares.length == 0 ? (
+          <Center style={{ height: "70vh" }}>
+            <Stack align="center" spacing={10}>
+              <Title order={3}>It's empty here 👀</Title>
+              <Text>You don't have any reverse shares.</Text>
+            </Stack>
+          </Center>
+        ) : (
+          <Box sx={{ display: "block", overflowX: "auto" }}>
+            <Table>
+              <thead>
+                <tr>
+                  <th>Name</th>
+                  <th>Visitors</th>
+                  <th>Max share size</th>
+                  <th>Expires at</th>
+                  <th></th>
+                </tr>
+              </thead>
+              <tbody>
+                {reverseShares.map((reverseShare) => (
+                  <tr key={reverseShare.id}>
+                    <td>
+                      {reverseShare.share ? (
+                        reverseShare.share?.id
+                      ) : (
+                        <Text color="dimmed">No share created yet</Text>
+                      )}
+                    </td>
+                    <td>{reverseShare.share?.views ?? "0"}</td>
+                    <td>
+                      {byteToHumanSizeString(
+                        parseInt(reverseShare.maxShareSize)
+                      )}
+                    </td>
+                    <td>
+                      {moment(reverseShare.shareExpiration).unix() === 0
+                        ? "Never"
+                        : moment(reverseShare.shareExpiration).format("LLL")}
+                    </td>
+                    <td>
+                      <Group position="right">
+                        {reverseShare.share && (
+                          <ActionIcon
+                            color="victoria"
+                            variant="light"
+                            size={25}
+                            onClick={() => {
+                              if (window.isSecureContext) {
+                                clipboard.copy(
+                                  `${config.get("APP_URL")}/share/${
+                                    reverseShare.share!.id
+                                  }`
+                                );
+                                toast.success(
+                                  "The share link was copied to the keyboard."
+                                );
+                              } else {
+                                showShareLinkModal(
+                                  modals,
+                                  reverseShare.share!.id,
+                                  config.get("APP_URL")
+                                );
+                              }
+                            }}
+                          >
+                            <TbLink />
+                          </ActionIcon>
+                        )}
+                        <ActionIcon
+                          color="red"
+                          variant="light"
+                          size={25}
+                          onClick={() => {
+                            modals.openConfirmModal({
+                              title: `Delete reverse share`,
+                              children: (
+                                <Text size="sm">
+                                  Do you really want to delete this reverse
+                                  share? If you do, the share will be deleted as
+                                  well.
+                                </Text>
+                              ),
+                              confirmProps: {
+                                color: "red",
+                              },
+                              labels: { confirm: "Confirm", cancel: "Cancel" },
+                              onConfirm: () => {
+                                shareService.removeReverseShare(
+                                  reverseShare.id
+                                );
+                                setReverseShares(
+                                  reverseShares.filter(
+                                    (item) => item.id !== reverseShare.id
+                                  )
+                                );
+                              },
+                            });
+                          }}
+                        >
+                          <TbTrash />
+                        </ActionIcon>
+                      </Group>
+                    </td>
+                  </tr>
+                ))}
+              </tbody>
+            </Table>
+          </Box>
+        )}
+      </>
+    );
+  }
+};
+
+export default MyShares;
--- a/frontend/src/pages/account/shares.tsx
+++ b/frontend/src/pages/account/shares.tsx
@ -1,5 +1,6 @@
 import {
  ActionIcon,
+  Box,
  Button,
  Center,
  Group,
@ -61,83 +62,85 @@ const MyShares = () => {
            </Stack>
          </Center>
        ) : (
-          <Table>
-            <thead>
-              <tr>
-                <th>Name</th>
-                <th>Visitors</th>
-                <th>Expires at</th>
-                <th></th>
-              </tr>
-            </thead>
-            <tbody>
-              {shares.map((share) => (
-                <tr key={share.id}>
-                  <td>{share.id}</td>
-                  <td>{share.views}</td>
-                  <td>
-                    {moment(share.expiration).unix() === 0
-                      ? "Never"
-                      : moment(share.expiration).format("LLL")}
-                  </td>
-                  <td>
-                    <Group position="right">
-                      <ActionIcon
-                        color="victoria"
-                        variant="light"
-                        size={25}
-                        onClick={() => {
-                          if (window.isSecureContext) {
-                            clipboard.copy(
-                              `${config.get("APP_URL")}/share/${share.id}`
-                            );
-                            toast.success(
-                              "Your link was copied to the keyboard."
-                            );
-                          } else {
-                            showShareLinkModal(
-                              modals,
-                              share.id,
-                              config.get("APP_URL")
-                            );
-                          }
-                        }}
-                      >
-                        <TbLink />
-                      </ActionIcon>
-                      <ActionIcon
-                        color="red"
-                        variant="light"
-                        size={25}
-                        onClick={() => {
-                          modals.openConfirmModal({
-                            title: `Delete share ${share.id}`,
-                            children: (
-                              <Text size="sm">
-                                Do you really want to delete this share?
-                              </Text>
-                            ),
-                            confirmProps: {
-                              color: "red",
-                            },
-                            labels: { confirm: "Confirm", cancel: "Cancel" },
-                            onConfirm: () => {
-                              shareService.remove(share.id);
-                              setShares(
-                                shares.filter((item) => item.id !== share.id)
-                              );
-                            },
-                          });
-                        }}
-                      >
-                        <TbTrash />
-                      </ActionIcon>
-                    </Group>
-                  </td>
+          <Box sx={{ display: "block", overflowX: "auto" }}>
+            <Table>
+              <thead>
+                <tr>
+                  <th>Name</th>
+                  <th>Visitors</th>
+                  <th>Expires at</th>
+                  <th></th>
                </tr>
-              ))}
-            </tbody>
-          </Table>
+              </thead>
+              <tbody>
+                {shares.map((share) => (
+                  <tr key={share.id}>
+                    <td>{share.id}</td>
+                    <td>{share.views}</td>
+                    <td>
+                      {moment(share.expiration).unix() === 0
+                        ? "Never"
+                        : moment(share.expiration).format("LLL")}
+                    </td>
+                    <td>
+                      <Group position="right">
+                        <ActionIcon
+                          color="victoria"
+                          variant="light"
+                          size={25}
+                          onClick={() => {
+                            if (window.isSecureContext) {
+                              clipboard.copy(
+                                `${config.get("APP_URL")}/share/${share.id}`
+                              );
+                              toast.success(
+                                "Your link was copied to the keyboard."
+                              );
+                            } else {
+                              showShareLinkModal(
+                                modals,
+                                share.id,
+                                config.get("APP_URL")
+                              );
+                            }
+                          }}
+                        >
+                          <TbLink />
+                        </ActionIcon>
+                        <ActionIcon
+                          color="red"
+                          variant="light"
+                          size={25}
+                          onClick={() => {
+                            modals.openConfirmModal({
+                              title: `Delete share ${share.id}`,
+                              children: (
+                                <Text size="sm">
+                                  Do you really want to delete this share?
+                                </Text>
+                              ),
+                              confirmProps: {
+                                color: "red",
+                              },
+                              labels: { confirm: "Confirm", cancel: "Cancel" },
+                              onConfirm: () => {
+                                shareService.remove(share.id);
+                                setShares(
+                                  shares.filter((item) => item.id !== share.id)
+                                );
+                              },
+                            });
+                          }}
+                        >
+                          <TbTrash />
+                        </ActionIcon>
+                      </Group>
+                    </td>
+                  </tr>
+                ))}
+              </tbody>
+            </Table>
+          </Box>
        )}
      </>
    );
--- a/frontend/src/pages/upload/[reverseShareToken].tsx
+++ b/frontend/src/pages/upload/[reverseShareToken].tsx
@ -0,0 +1,43 @@
+import { LoadingOverlay } from "@mantine/core";
+import { useModals } from "@mantine/modals";
+import { GetServerSidePropsContext } from "next";
+import { useEffect, useState } from "react";
+import Upload from ".";
+import showErrorModal from "../../components/share/showErrorModal";
+import shareService from "../../services/share.service";
+
+export function getServerSideProps(context: GetServerSidePropsContext) {
+  return {
+    props: { reverseShareToken: context.params!.reverseShareToken },
+  };
+}
+
+const Share = ({ reverseShareToken }: { reverseShareToken: string }) => {
+  const modals = useModals();
+  const [isLoading, setIsLoading] = useState(true);
+
+  const [maxShareSize, setMaxShareSize] = useState(0);
+
+  useEffect(() => {
+    shareService
+      .setReverseShare(reverseShareToken)
+      .then((reverseShareTokenData) => {
+        setMaxShareSize(parseInt(reverseShareTokenData.maxShareSize));
+        setIsLoading(false);
+      })
+      .catch(() => {
+        showErrorModal(
+          modals,
+          "Invalid Link",
+          "This link is invalid. Please check your link."
+        );
+        setIsLoading(false);
+      });
+  }, []);
+
+  if (isLoading) return <LoadingOverlay visible />;
+
+  return <Upload isReverseShare maxShareSize={maxShareSize} />;
+};
+
+export default Share;
--- a/frontend/src/pages/upload/index.tsx
+++ b/frontend/src/pages/upload/index.tsx
@ -2,27 +2,34 @@ import { Button, Group } from "@mantine/core";
 import { useModals } from "@mantine/modals";
 import { cleanNotifications } from "@mantine/notifications";
 import { AxiosError } from "axios";
+import { getCookie } from "cookies-next";
 import { useRouter } from "next/router";
 import pLimit from "p-limit";
 import { useEffect, useState } from "react";
-import Meta from "../components/Meta";
-import Dropzone from "../components/upload/Dropzone";
-import FileList from "../components/upload/FileList";
-import showCompletedUploadModal from "../components/upload/modals/showCompletedUploadModal";
-import showCreateUploadModal from "../components/upload/modals/showCreateUploadModal";
-import useConfig from "../hooks/config.hook";
-import useUser from "../hooks/user.hook";
-import shareService from "../services/share.service";
-import { FileUpload } from "../types/File.type";
-import { CreateShare, Share } from "../types/share.type";
-import toast from "../utils/toast.util";
+import Meta from "../../components/Meta";
+import Dropzone from "../../components/upload/Dropzone";
+import FileList from "../../components/upload/FileList";
+import showCompletedUploadModal from "../../components/upload/modals/showCompletedUploadModal";
+import showCreateUploadModal from "../../components/upload/modals/showCreateUploadModal";
+import useConfig from "../../hooks/config.hook";
+import useUser from "../../hooks/user.hook";
+import shareService from "../../services/share.service";
+import { FileUpload } from "../../types/File.type";
+import { CreateShare, Share } from "../../types/share.type";
+import toast from "../../utils/toast.util";

 const promiseLimit = pLimit(3);
 const chunkSize = 10 * 1024 * 1024; // 10MB
 let errorToastShown = false;
 let createdShare: Share;

-const Upload = () => {
+const Upload = ({
+  maxShareSize,
+  isReverseShare = false,
+}: {
+  maxShareSize?: number;
+  isReverseShare: boolean;
+}) => {
  const router = useRouter();
  const modals = useModals();

@ -31,6 +38,8 @@ const Upload = () => {
  const [files, setFiles] = useState<FileUpload[]>([]);
  const [isUploading, setisUploading] = useState(false);

+  maxShareSize ??= parseInt(config.get("MAX_SHARE_SIZE"));
+
  const uploadFiles = async (share: CreateShare) => {
    setisUploading(true);
    createdShare = await shareService.create(share);
@ -138,9 +147,9 @@ const Upload = () => {
    ) {
      shareService
        .completeShare(createdShare.id)
-        .then(() => {
+        .then((share) => {
          setisUploading(false);
-          showCompletedUploadModal(modals, createdShare, config.get("APP_URL"));
+          showCompletedUploadModal(modals, share, config.get("APP_URL"));
          setFiles([]);
        })
        .catch(() =>
@ -149,8 +158,13 @@ const Upload = () => {
    }
  }, [files]);

-  if (!user && !config.get("ALLOW_UNAUTHENTICATED_SHARES")) {
+  if (
+    !user &&
+    !config.get("ALLOW_UNAUTHENTICATED_SHARES") &&
+    !getCookie("reverse_share_token")
+  ) {
    router.replace("/");
+    return null;
  } else {
    return (
      <>
@ -164,11 +178,14 @@ const Upload = () => {
                modals,
                {
                  isUserSignedIn: user ? true : false,
+                  isReverseShare,
                  appUrl: config.get("APP_URL"),
                  allowUnauthenticatedShares: config.get(
                    "ALLOW_UNAUTHENTICATED_SHARES"
                  ),
-                  enableEmailRecepients: config.get("ENABLE_EMAIL_RECIPIENTS"),
+                  enableEmailRecepients: config.get(
+                    "ENABLE_SHARE_EMAIL_RECIPIENTS"
+                  ),
                },
                uploadFiles
              );
@ -177,7 +194,12 @@ const Upload = () => {
            Share
          </Button>
        </Group>
-        <Dropzone files={files} setFiles={setFiles} isUploading={isUploading} />
+        <Dropzone
+          maxShareSize={maxShareSize}
+          files={files}
+          setFiles={setFiles}
+          isUploading={isUploading}
+        />
        {files.length > 0 && <FileList files={files} setFiles={setFiles} />}
      </>
    );
--- a/frontend/src/services/share.service.ts
+++ b/frontend/src/services/share.service.ts
@ -1,6 +1,8 @@
+import { setCookie } from "cookies-next";
 import { FileUploadResponse } from "../types/File.type";
 import {
  CreateShare,
+  MyReverseShare,
  MyShare,
  Share,
  ShareMetaData,
@ -98,6 +100,34 @@ const uploadFile = async (
  ).data;
 };

+const createReverseShare = async (
+  shareExpiration: string,
+  maxShareSize: number,
+  sendEmailNotification: boolean
+) => {
+  return (
+    await api.post("reverseShares", {
+      shareExpiration,
+      maxShareSize: maxShareSize.toString(),
+      sendEmailNotification,
+    })
+  ).data;
+};
+
+const getMyReverseShares = async (): Promise<MyReverseShare[]> => {
+  return (await api.get("reverseShares")).data;
+};
+
+const setReverseShare = async (reverseShareToken: string) => {
+  const { data } = await api.get(`/reverseShares/${reverseShareToken}`);
+  setCookie("reverse_share_token", reverseShareToken);
+  return data;
+};
+
+const removeReverseShare = async (id: string) => {
+  await api.delete(`/reverseShares/${id}`);
+};
+
 export default {
  create,
  completeShare,
@ -109,4 +139,8 @@ export default {
  isShareIdAvailable,
  downloadFile,
  uploadFile,
+  setReverseShare,
+  createReverseShare,
+  getMyReverseShares,
+  removeReverseShare,
 };
--- a/frontend/src/types/share.type.ts
+++ b/frontend/src/types/share.type.ts
@ -26,6 +26,13 @@ export type MyShare = Share & {
  cratedAt: Date;
 };

+export type MyReverseShare = {
+  id: string;
+  maxShareSize: string;
+  shareExpiration: Date;
+  share?: MyShare;
+};
+
 export type ShareSecurity = {
  maxViews?: number;
  password?: string;
--- a/frontend/src/utils/date.util.ts
+++ b/frontend/src/utils/date.util.ts
@ -0,0 +1,26 @@
+import moment from "moment";
+
+export const getExpirationPreview = (
+  name: string,
+  form: {
+    values: {
+      never_expires?: boolean;
+      expiration_num: number;
+      expiration_unit: string;
+    };
+  }
+) => {
+  const value = form.values.never_expires
+    ? "never"
+    : form.values.expiration_num + form.values.expiration_unit;
+  if (value === "never") return `This ${name} will never expire.`;
+
+  const expirationDate = moment()
+    .add(
+      value.split("-")[0],
+      value.split("-")[1] as moment.unitOfTime.DurationConstructor
+    )
+    .toDate();
+
+  return `This ${name} will expire on ${moment(expirationDate).format("LLL")}`;
+};
--- a/frontend/src/utils/fileSize.util.ts
+++ b/frontend/src/utils/fileSize.util.ts
@ -0,0 +1,23 @@
+export function byteToHumanSizeString(bytes: number) {
+  const sizes = ["B", "KB", "MB", "GB", "TB"];
+  if (bytes == 0) return "0 Byte";
+  const i = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)).toString());
+  return (bytes / Math.pow(1024, i)).toFixed(1).toString() + " " + sizes[i];
+}
+
+export function byteToUnitAndSize(bytes: number) {
+  const units = ["B", "KB", "MB", "GB", "TB"];
+  if (bytes == 0) return { unit: "B", size: 0 };
+  const i = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)).toString());
+
+  return {
+    size: parseFloat((bytes / Math.pow(1024, i)).toFixed(1)),
+    unit: units[i],
+  };
+}
+
+export function unitAndSizeToByte(unit: string, size: number) {
+  const units = ["B", "KB", "MB", "GB", "TB"];
+  const i = units.indexOf(unit);
+  return Math.pow(1024, i) * size;
+}
--- a/frontend/src/utils/math/byteStringToHumanSizeString.util.ts
+++ b/frontend/src/utils/math/byteStringToHumanSizeString.util.ts
@ -1,11 +0,0 @@
-export function byteStringToHumanSizeString(bytes: string) {
-  const bytesNumber = parseInt(bytes);
-  const sizes = ["B", "KB", "MB", "GB", "TB"];
-  if (bytesNumber == 0) return "0 Byte";
-  const i = parseInt(
-    Math.floor(Math.log(bytesNumber) / Math.log(1024)).toString()
-  );
-  return (
-    (bytesNumber / Math.pow(1024, i)).toFixed(1).toString() + " " + sizes[i]
-  );
-}