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Update DeveloperGuide.md
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Anthony Stirling
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@ -298,3 +298,260 @@ When contributing translations:
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3. The PR checks will verify consistency in language file updates.
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Remember to test your changes thoroughly to ensure they don't break any existing functionality.
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# Code examples
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### Overview of Thymeleaf
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Thymeleaf is a server-side Java HTML template engine. It is used in Stirling-PDF to render dynamic web pages. Thymeleaf integrates heavily with Spring Boot
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### Thymeleaf overview
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In Stirling-PDF, Thymeleaf is used to create HTML templates that are rendered on the server side. These templates are located in the `src/main/resources/templates` directory. Thymeleaf templates use a combination of HTML and special Thymeleaf attributes to dynamically generate content.
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Some examples of this are
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```html
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<th:block th:insert="~{fragments/navbar.html :: navbar}"></th:block>
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or
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<th:block th:insert="~{fragments/footer.html :: footer}"></th:block>
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```
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Where it uses the th:block, th: indicating its a special thymeleaf element to be used serverside in generating the html, and block being the actual element type.
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In this case we are inserting the ``navbar`` entry within the ``fragments/navbar.html`` fragment into the ``th:block`` element.
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They can be more complex such as
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```html
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<th:block th:insert="~{fragments/common :: head(title=#{pageExtracter.title}, header=#{pageExtracter.header})}"></th:block>
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```
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Which is the same as above but passes the parameters title and header into the fragment common.html to be used in its HTML generation
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Thymeleaf can also be used to loop through objects or pass things from java side into html side.
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```java
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@GetMapping
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public String newFeaturePage(Model model) {
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model.addAttribute("exampleData", exampleData);
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return "new-feature";
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}
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```
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in above example if exampleData is a list of plain java objects of class Person and within it you had id, name, age etc. You can reference it like so
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```html
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<tbody>
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<!-- Use th:each to iterate over the list -->
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<tr th:each="person : ${exampleData}">
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<td th:text="${person.id}"></td>
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<td th:text="${person.name}"></td>
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<td th:text="${person.age}"></td>
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<td th:text="${person.email}"></td>
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</tr>
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</tbody>
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```
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This would generate n entries of tr for each person in exampleData
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### Adding a New Feature to the Backend (API)
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1. **Create a New Controller:**
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- Create a new Java class in the `src/main/java/stirling/software/SPDF/controller/api` directory.
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- Annotate the class with `@RestController` and `@RequestMapping` to define the API endpoint.
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- Ensure to add API documentation annotations like `@Tag(name = "General", description = "General APIs")` and `@Operation(summary = "Crops a PDF document", description = "This operation takes an input PDF file and crops it according to the given coordinates. Input:PDF Output:PDF Type:SISO")`.
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```java
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package stirling.software.SPDF.controller.api;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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import io.swagger.v3.oas.annotations.Operation;
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import io.swagger.v3.oas.annotations.tags.Tag;
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@RestController
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@RequestMapping("/api/v1/new-feature")
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@Tag(name = "General", description = "General APIs")
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public class NewFeatureController {
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@GetMapping
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@Operation(summary = "New Feature", description = "This is a new feature endpoint.")
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public String newFeature() {
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return "NewFeatureResponse"; // This refers to the NewFeatureResponse.html template presenting the user with the generated html from that file when they navigate to /api/v1/new-feature
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}
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}
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```
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2. **Define the Service Layer:** (Not required but often useful)
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- Create a new service class in the `src/main/java/stirling/software/SPDF/service` directory.
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- Implement the business logic for the new feature.
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```java
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package stirling.software.SPDF.service;
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import org.springframework.stereotype.Service;
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@Service
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public class NewFeatureService {
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public String getNewFeatureData() {
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// Implement business logic here
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return "New Feature Data";
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}
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}
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```
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2b. **Integrate the Service with the Controller:**
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- Autowire the service class in the controller and use it to handle the API request.
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```java
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package stirling.software.SPDF.controller.api;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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import stirling.software.SPDF.service.NewFeatureService;
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import io.swagger.v3.oas.annotations.Operation;
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import io.swagger.v3.oas.annotations.tags.Tag;
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@RestController
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@RequestMapping("/api/v1/new-feature")
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@Tag(name = "General", description = "General APIs")
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public class NewFeatureController {
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@Autowired
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private NewFeatureService newFeatureService;
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@GetMapping
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@Operation(summary = "New Feature", description = "This is a new feature endpoint.")
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public String newFeature() {
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return newFeatureService.getNewFeatureData();
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}
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}
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```
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### Adding a New Feature to the Frontend (UI)
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1. **Create a New Thymeleaf Template:**
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- Create a new HTML file in the `src/main/resources/templates` directory.
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- Use Thymeleaf attributes to dynamically generate content.
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- Use `extract-page.html` as a base example for the HTML template, useful to ensure importing of the general layout, navbar and footer.
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```html
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<!DOCTYPE html>
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<html th:lang="${#locale.language}" th:dir="#{language.direction}" th:data-language="${#locale.toString()}" xmlns:th="https://www.thymeleaf.org">
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<head>
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<th:block th:insert="~{fragments/common :: head(title=#{newFeature.title}, header=#{newFeature.header})}"></th:block>
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</head>
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<body>
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<div id="page-container">
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<div id="content-wrap">
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<th:block th:insert="~{fragments/navbar.html :: navbar}"></th:block>
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<br><br>
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<div class="container">
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<div class="row justify-content-center">
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<div class="col-md-6 bg-card">
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<div class="tool-header">
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<span class="material-symbols-rounded tool-header-icon organize">upload</span>
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<span class="tool-header-text" th:text="#{newFeature.header}"></span>
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</div>
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<form th:action="@{'/api/v1/new-feature'}" method="post" enctype="multipart/form-data">
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<div th:replace="~{fragments/common :: fileSelector(name='fileInput', multipleInputsForSingleRequest=false, accept='application/pdf')}"></div>
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<input type="hidden" id="customMode" name="customMode" value="">
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<div class="mb-3">
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<label for="featureInput" th:text="#{newFeature.prompt}"></label>
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<input type="text" class="form-control" id="featureInput" name="featureInput" th:placeholder="#{newFeature.placeholder}" required>
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</div>
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<button type="submit" id="submitBtn" class="btn btn-primary" th:text="#{newFeature.submit}"></button>
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</form>
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</div>
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</div>
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</div>
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</div>
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<th:block th:insert="~{fragments/footer.html :: footer}"></th:block>
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</div>
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</body>
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</html>
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```
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2. **Create a New Controller for the UI:**
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- Create a new Java class in the `src/main/java/stirling/software/SPDF/controller/ui` directory.
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- Annotate the class with `@Controller` and `@RequestMapping` to define the UI endpoint.
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```java
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package stirling.software.SPDF.controller.ui;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Controller;
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import org.springframework.ui.Model;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RequestMapping;
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import stirling.software.SPDF.service.NewFeatureService;
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@Controller
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@RequestMapping("/new-feature")
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public class NewFeatureUIController {
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@Autowired
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private NewFeatureService newFeatureService;
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@GetMapping
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public String newFeaturePage(Model model) {
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model.addAttribute("newFeatureData", newFeatureService.getNewFeatureData());
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return "new-feature";
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}
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}
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```
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3. **Update the Navigation Bar:**
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- Add a link to the new feature page in the navigation bar.
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- Update the `src/main/resources/templates/fragments/navbar.html` file.
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```html
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<li class="nav-item">
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<a class="nav-link" th:href="@{/new-feature}">New Feature</a>
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</li>
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```
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## Adding New Translations to Existing Language Files in Stirling-PDF
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When adding a new feature or modifying existing ones in Stirling-PDF, you'll need to add new translation entries to the existing language files. Here's a step-by-step guide:
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### 1. Locate Existing Language Files
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Find the existing `messages.properties` files in the `src/main/resources` directory. You'll see files like:
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- `messages.properties` (default, usually English)
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- `messages_en_GB.properties`
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- `messages_fr.properties`
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- `messages_de.properties`
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- etc.
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### 2. Add New Translation Entries
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Open each of these files and add your new translation entries. For example, if you're adding a new feature called "PDF Splitter",
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Use descriptive, hierarchical keys (e.g., `feature.element.description`)
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you might add:
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```properties
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pdfSplitter.title=PDF Splitter
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pdfSplitter.description=Split your PDF into multiple documents
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pdfSplitter.button.split=Split PDF
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pdfSplitter.input.pages=Enter page numbers to split
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```
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Add these entries to the default GB language file and any others you wish, translating the values as appropriate for each language.
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### 3. Use Translations in Thymeleaf Templates
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In your Thymeleaf templates, use the `#{key}` syntax to reference the new translations:
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```html
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<h1 th:text="#{pdfSplitter.title}">PDF Splitter</h1>
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<p th:text="#{pdfSplitter.description}">Split your PDF into multiple documents</p>
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<input type="text" th:placeholder="#{pdfSplitter.input.pages}">
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<button th:text="#{pdfSplitter.button.split}">Split PDF</button>
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```
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Remember, never hard-code text in your templates or Java code. Always use translation keys to ensure proper localization.
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