Add watermark when loading documents

package.json

@@ -32,6 +32,7 @@
 		"jwt-decode": "^3.1.2",
 		"le-coffre-resources": "file:../lecoffre-ressources",
 		"next": "^14.2.3",
+		"pdf-lib": "^1.17.1",
 		"prettier": "^2.8.7",
 		"react": "18.2.0",
 		"react-dom": "18.2.0",

src/front/Components/Layouts/ClientDashboard/DepositDocumentComponent/index.tsx

@@ -10,6 +10,7 @@ import Confirm from "@Front/Components/DesignSystem/OldModal/Confirm";
 import FileService from "src/common/Api/LeCoffreApi/sdk/FileService";
 import DocumentService from "src/common/Api/LeCoffreApi/sdk/DocumentService";
 import { FileBlob, FileData } from "@Front/Api/Entities/types";
+import WatermarkService from "@Front/Services/WatermarkService";
 
 type IProps = {
 	document: any;
@@ -31,7 +32,57 @@ export default function DepositDocumentComponent(props: IProps) {
 	}, [document.files]);
 
 	const addFile = useCallback(
-		(file: File) => {
+		async (file: File) => {
+			try {
+				// Add watermark to the file before processing
+				const watermarkedFile = await WatermarkService.getInstance().addWatermark(file);
+				
+				return new Promise<void>(
+					(resolve: () => void) => {
+						const reader = new FileReader();
+						reader.onload = (event) => {
+							if (event.target?.result) {
+								const arrayBuffer = event.target.result as ArrayBuffer;
+								const uint8Array = new Uint8Array(arrayBuffer);
+
+								const fileBlob: FileBlob = {
+									type: watermarkedFile.type,
+									data: uint8Array
+								};
+
+								const fileData: FileData = {
+									file_blob: fileBlob,
+									file_name: watermarkedFile.name
+								};
+								const validatorId: string = '884cb36a346a79af8697559f16940141f068bdf1656f88fa0df0e9ecd7311fb8:0';
+
+								FileService.createFile(fileData, validatorId).then((processCreated: any) => {
+									const fileUid: string = processCreated.processData.uid;
+
+									DocumentService.getDocumentByUid(document.uid!).then((process: any) => {
+										if (process) {
+											const document: any = process.processData;
+
+											let files: any[] = document.files;
+											if (!files) {
+												files = [];
+											}
+											files.push({ uid: fileUid });
+
+											DocumentService.updateDocument(process, { files: files, document_status: EDocumentStatus.DEPOSITED }).then(() => resolve());
+										}
+									});
+								});
+							}
+						};
+						reader.readAsArrayBuffer(watermarkedFile);
+					})
+					.then(onChange)
+					.then(() => ToasterService.getInstance().success({ title: "Succès !", description: "Fichier uploadé avec succès!" }))
+					.catch((error) => ToasterService.getInstance().error({ title: "Erreur !", description: error.message }));
+			} catch (error) {
+				console.error('Error processing file with watermark:', error);
+				// If watermarking fails, proceed with original file
 				return new Promise<void>(
 					(resolve: () => void) => {
 						const reader = new FileReader();
@@ -75,6 +126,7 @@ export default function DepositDocumentComponent(props: IProps) {
 					.then(onChange)
 					.then(() => ToasterService.getInstance().success({ title: "Succès !", description: "Fichier uploadé avec succès!" }))
 					.catch((error) => ToasterService.getInstance().error({ title: "Erreur !", description: error.message }));
+			}
 		},
 		[document.uid, onChange],
 	);

src/front/Services/WatermarkService/index.ts

@@ -0,0 +1,211 @@
+export default class WatermarkService {
+	private static instance: WatermarkService;
+
+	public static getInstance(): WatermarkService {
+		if (!WatermarkService.instance) {
+			WatermarkService.instance = new WatermarkService();
+		}
+		return WatermarkService.instance;
+	}
+
+	/**
+	 * Add a watermark to a file based on its type
+	 * @param file - The original file
+	 * @returns Promise<File> - The file with watermark added
+	 */
+	public async addWatermark(file: File): Promise<File> {
+		const fileType = file.type;
+		
+		try {
+			if (fileType.startsWith('image/')) {
+				return await this.addWatermarkToImage(file);
+			} else if (fileType === 'application/pdf') {
+				return await this.addWatermarkToPdf(file);
+			} else {
+				// For other file types, return the original file
+				console.log(`Watermark not supported for file type: ${fileType}`);
+				return file;
+			}
+		} catch (error) {
+			console.error('Error adding watermark:', error);
+			// Return original file if watermarking fails
+			return file;
+		}
+	}
+
+	/**
+	 * Add watermark to image files
+	 * @param file - Image file
+	 * @returns Promise<File> - Image with watermark
+	 */
+	private async addWatermarkToImage(file: File): Promise<File> {
+		return new Promise((resolve, reject) => {
+			const reader = new FileReader();
+			reader.onload = (event) => {
+				try {
+					const img = new Image();
+					img.onload = () => {
+						try {
+							// Create canvas
+							const canvas = document.createElement('canvas');
+							const ctx = canvas.getContext('2d');
+							
+							if (!ctx) {
+								reject(new Error('Could not get canvas context'));
+								return;
+							}
+							
+							// Set canvas size to image size
+							canvas.width = img.width;
+							canvas.height = img.height;
+							
+							// Draw original image
+							ctx.drawImage(img, 0, 0);
+							
+							// Add watermark
+							this.addImageWatermark(ctx, img.width, img.height);
+							
+							// Convert to blob
+							canvas.toBlob((blob) => {
+								if (blob) {
+									const watermarkedFile = new File([blob], file.name, { type: file.type });
+									resolve(watermarkedFile);
+								} else {
+									reject(new Error('Could not create blob from canvas'));
+								}
+							}, file.type);
+						} catch (error) {
+							reject(error);
+						}
+					};
+					img.onerror = reject;
+					img.src = event.target?.result as string;
+				} catch (error) {
+					reject(error);
+				}
+			};
+			reader.onerror = reject;
+			reader.readAsDataURL(file);
+		});
+	}
+
+	/**
+	 * Add watermark to PDF files
+	 * @param file - PDF file
+	 * @returns Promise<File> - PDF with watermark
+	 */
+	private async addWatermarkToPdf(file: File): Promise<File> {
+		return new Promise((resolve, reject) => {
+			const reader = new FileReader();
+			reader.onload = async (event) => {
+				try {
+					const arrayBuffer = event.target?.result as ArrayBuffer;
+					
+					// Import pdf-lib dynamically to avoid SSR issues
+					const { PDFDocument, rgb } = await import('pdf-lib');
+					
+					// Load the existing PDF
+					const pdfDoc = await PDFDocument.load(arrayBuffer);
+					
+					// Get all pages
+					const pages = pdfDoc.getPages();
+					
+					// Add watermark to each page
+					for (const page of pages) {
+						this.addPdfWatermark(page, rgb(0.8, 0.2, 0.2)); // Pale red color
+					}
+					
+					// Save the modified PDF
+					const pdfBytes = await pdfDoc.save();
+					const watermarkedFile = new File([pdfBytes], file.name, { type: file.type });
+					resolve(watermarkedFile);
+					
+				} catch (error) {
+					console.error('Error adding watermark to PDF:', error);
+					// If PDF watermarking fails, return original file
+					resolve(file);
+				}
+			};
+			reader.onerror = reject;
+			reader.readAsArrayBuffer(file);
+		});
+	}
+
+	/**
+	 * Add watermark to image using Canvas
+	 * @param ctx - Canvas 2D context
+	 * @param width - Image width
+	 * @param height - Image height
+	 */
+	private addImageWatermark(ctx: CanvasRenderingContext2D, width: number, height: number): void {
+		// Save current state
+		ctx.save();
+		
+		// Set watermark properties
+		ctx.fillStyle = 'rgba(128, 128, 128, 0.7)'; // Semi-transparent gray
+		ctx.font = '12px Arial';
+		ctx.textAlign = 'right';
+		ctx.textBaseline = 'bottom';
+		
+		// Position watermark in bottom-right corner
+		const text = 'Processed by LeCoffre';
+		const x = width - 10; // 10 pixels from right edge
+		const y = height - 10; // 10 pixels from bottom
+		
+		// Add watermark text
+		ctx.fillText(text, x, y);
+		
+		// Restore state
+		ctx.restore();
+	}
+
+	/**
+	 * Add watermark to PDF using pdf-lib
+	 * @param page - PDF page from pdf-lib
+	 * @param color - Color for the watermark
+	 */
+	private addPdfWatermark(page: any, color: any): void {
+		const { width, height } = page.getSize();
+		
+		// Calculate watermark position (bottom-right corner)
+		const text = 'Processed by LeCoffre';
+		const dateTime = new Date().toLocaleString('fr-FR', {
+			year: 'numeric',
+			month: '2-digit',
+			day: '2-digit',
+			hour: '2-digit',
+			minute: '2-digit'
+		});
+		
+		const fontSize = 10;
+		const lineHeight = 12; // Space between lines
+		
+		// Calculate text widths (approximate - pdf-lib doesn't have a direct method for this)
+		// Using a conservative estimate: ~6 points per character for 10pt font
+		const estimatedTextWidth1 = text.length * 6;
+		const estimatedTextWidth2 = dateTime.length * 6;
+		const maxTextWidth = Math.max(estimatedTextWidth1, estimatedTextWidth2);
+		
+		// Position watermark with proper margins (20 points from edges)
+		const x = width - maxTextWidth - 20; // 20 points from right edge
+		const y = 20; // 20 points from bottom
+		
+		// Add watermark text with transparency (first line)
+		page.drawText(text, {
+			x: x,
+			y: y + lineHeight, // Second line (top)
+			size: fontSize,
+			color: color,
+			opacity: 0.7
+		});
+		
+		// Add date/time with transparency (second line)
+		page.drawText(dateTime, {
+			x: x,
+			y: y, // First line (bottom)
+			size: fontSize,
+			color: color,
+			opacity: 0.7
+		});
+	}
+}