243 lines
8.9 KiB
Java
243 lines
8.9 KiB
Java
package stirling.software.SPDF.utils;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.MalformedURLException;
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import java.nio.file.FileVisitResult;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.nio.file.SimpleFileVisitor;
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import java.nio.file.attribute.BasicFileAttributes;
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import java.util.ArrayList;
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import java.util.List;
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import org.springframework.web.multipart.MultipartFile;
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import com.fathzer.soft.javaluator.DoubleEvaluator;
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import io.github.pixee.security.HostValidator;
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import io.github.pixee.security.Urls;
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public class GeneralUtils {
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public static File convertMultipartFileToFile(MultipartFile multipartFile) throws IOException {
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File tempFile = Files.createTempFile("temp", null).toFile();
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try (FileOutputStream os = new FileOutputStream(tempFile)) {
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os.write(multipartFile.getBytes());
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}
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return tempFile;
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}
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public static void deleteDirectory(Path path) throws IOException {
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Files.walkFileTree(
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path,
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new SimpleFileVisitor<Path>() {
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@Override
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public FileVisitResult visitFile(Path file, BasicFileAttributes attrs)
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throws IOException {
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Files.delete(file);
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return FileVisitResult.CONTINUE;
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}
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@Override
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public FileVisitResult postVisitDirectory(Path dir, IOException exc)
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throws IOException {
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Files.delete(dir);
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return FileVisitResult.CONTINUE;
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}
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});
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}
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public static String convertToFileName(String name) {
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String safeName = name.replaceAll("[^a-zA-Z0-9]", "_");
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if (safeName.length() > 50) {
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safeName = safeName.substring(0, 50);
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}
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return safeName;
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}
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public static boolean isValidURL(String urlStr) {
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try {
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Urls.create(
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urlStr, Urls.HTTP_PROTOCOLS, HostValidator.DENY_COMMON_INFRASTRUCTURE_TARGETS);
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return true;
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} catch (MalformedURLException e) {
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return false;
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}
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}
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public static File multipartToFile(MultipartFile multipart) throws IOException {
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Path tempFile = Files.createTempFile("overlay-", ".pdf");
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try (InputStream in = multipart.getInputStream();
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FileOutputStream out = new FileOutputStream(tempFile.toFile())) {
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byte[] buffer = new byte[1024];
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int bytesRead;
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while ((bytesRead = in.read(buffer)) != -1) {
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out.write(buffer, 0, bytesRead);
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}
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}
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return tempFile.toFile();
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}
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public static Long convertSizeToBytes(String sizeStr) {
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if (sizeStr == null) {
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return null;
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}
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sizeStr = sizeStr.trim().toUpperCase();
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try {
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if (sizeStr.endsWith("KB")) {
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return (long)
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(Double.parseDouble(sizeStr.substring(0, sizeStr.length() - 2)) * 1024);
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} else if (sizeStr.endsWith("MB")) {
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return (long)
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(Double.parseDouble(sizeStr.substring(0, sizeStr.length() - 2))
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* 1024
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* 1024);
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} else if (sizeStr.endsWith("GB")) {
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return (long)
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(Double.parseDouble(sizeStr.substring(0, sizeStr.length() - 2))
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* 1024
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* 1024
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* 1024);
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} else if (sizeStr.endsWith("B")) {
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return Long.parseLong(sizeStr.substring(0, sizeStr.length() - 1));
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} else {
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// Assume MB if no unit is specified
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return (long) (Double.parseDouble(sizeStr) * 1024 * 1024);
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}
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} catch (NumberFormatException e) {
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// The numeric part of the input string cannot be parsed, handle this case
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}
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return null;
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}
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public static List<Integer> parsePageList(String pages, int totalPages, boolean oneBased) {
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if (pages == null) {
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return List.of(1); // Default to first page if input is null
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}
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try {
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return parsePageList(pages.split(","), totalPages, oneBased);
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} catch (NumberFormatException e) {
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return List.of(1); // Default to first page if input is invalid
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}
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}
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public static List<Integer> parsePageList(String[] pages, int totalPages) {
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return parsePageList(pages, totalPages, false);
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}
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public static List<Integer> parsePageList(String[] pages, int totalPages, boolean oneBased) {
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List<Integer> result = new ArrayList<>();
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int offset = oneBased ? 1 : 0;
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for (String page : pages) {
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if ("all".equalsIgnoreCase(page)) {
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for (int i = 0; i < totalPages; i++) {
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result.add(i + offset);
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}
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} else if (page.contains(",")) {
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// Split the string into parts, could be single pages or ranges
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String[] parts = page.split(",");
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for (String part : parts) {
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result.addAll(handlePart(part, totalPages, offset));
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}
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} else {
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result.addAll(handlePart(page, totalPages, offset));
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}
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}
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return new ArrayList<>(
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new java.util.LinkedHashSet<>(result)); // Remove duplicates and maintain order
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}
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public static List<Integer> evaluateNFunc(String expression, int maxValue) {
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List<Integer> results = new ArrayList<>();
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DoubleEvaluator evaluator = new DoubleEvaluator();
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// Validate the expression
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if (!expression.matches("[0-9n+\\-*/() ]+")) {
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throw new IllegalArgumentException("Invalid expression");
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}
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int n = 0;
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while (true) {
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// Replace 'n' with the current value of n, correctly handling numbers before 'n'
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String sanitizedExpression = insertMultiplicationBeforeN(expression, n);
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Double result = evaluator.evaluate(sanitizedExpression);
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// Check if the result is null or not within bounds
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if (result == null || result <= 0 || result.intValue() > maxValue) {
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if (n != 0) break;
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} else {
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results.add(result.intValue());
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}
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n++;
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}
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return results;
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}
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private static String insertMultiplicationBeforeN(String expression, int nValue) {
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// Insert multiplication between a number and 'n' (e.g., "4n" becomes "4*n")
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String withMultiplication = expression.replaceAll("(\\d)n", "$1*n");
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// Now replace 'n' with its current value
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return withMultiplication.replaceAll("n", String.valueOf(nValue));
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}
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private static List<Integer> handlePart(String part, int totalPages, int offset) {
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List<Integer> partResult = new ArrayList<>();
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// First check for n-syntax because it should not be processed as a range
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if (part.contains("n")) {
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partResult = evaluateNFunc(part, totalPages);
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// Adjust the results according to the offset
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for (int i = 0; i < partResult.size(); i++) {
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int adjustedValue = partResult.get(i) - 1 + offset;
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partResult.set(i, adjustedValue);
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}
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} else if (part.contains("-")) {
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// Process ranges only if it's not n-syntax
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String[] rangeParts = part.split("-");
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try {
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int start = Integer.parseInt(rangeParts[0]);
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int end = Integer.parseInt(rangeParts[1]);
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for (int i = start; i <= end; i++) {
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if (i >= 1 && i <= totalPages) {
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partResult.add(i - 1 + offset);
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}
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}
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} catch (NumberFormatException e) {
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// Range is invalid, ignore this part
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}
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} else {
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// This is a single page number
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try {
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int pageNum = Integer.parseInt(part.trim());
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if (pageNum >= 1 && pageNum <= totalPages) {
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partResult.add(pageNum - 1 + offset);
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}
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} catch (NumberFormatException ignored) {
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// Ignore invalid numbers
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}
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}
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return partResult;
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}
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public static boolean createDir(String path) {
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Path folder = Paths.get(path);
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if (!Files.exists(folder)) {
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try {
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Files.createDirectories(folder);
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} catch (IOException e) {
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e.printStackTrace();
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return false;
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}
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}
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return true;
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}
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}
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