watermark fix

build.gradle

@@ -62,10 +62,6 @@ dependencies {
     implementation 'org.springframework.boot:spring-boot-starter-actuator'
     implementation 'io.micrometer:micrometer-core'
     
-    // https://mvnrepository.com/artifact/com.cybozu.labs/langdetect
-implementation group: 'com.cybozu.labs', name: 'langdetect', version: '1.1-20120112'
-    
-    
     developmentOnly("org.springframework.boot:spring-boot-devtools")
 
 }

src/main/java/stirling/software/SPDF/controller/api/security/WatermarkController.java

@@ -5,6 +5,8 @@ import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.util.Arrays;
+import java.util.List;
 
 import org.apache.commons.io.IOUtils;
 import org.apache.pdfbox.pdmodel.PDDocument;
@@ -23,14 +25,11 @@ import org.springframework.web.bind.annotation.RequestPart;
 import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.multipart.MultipartFile;
 
-import com.cybozu.labs.langdetect.Detector;
-import com.cybozu.labs.langdetect.DetectorFactory;
-
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.Parameter;
 import io.swagger.v3.oas.annotations.tags.Tag;
 import stirling.software.SPDF.utils.WebResponseUtils;
-
+import io.swagger.v3.oas.annotations.media.Schema;
 @RestController
 @Tag(name = "Security", description = "Security APIs")
 public class WatermarkController {
@@ -42,6 +41,12 @@ public class WatermarkController {
             @RequestPart(required = true, value = "fileInput")
             @Parameter(description = "The input PDF file to add a watermark")
                     MultipartFile pdfFile,
+            @RequestParam(defaultValue = "roman", name = "alphabet")
+            @Parameter(description = "The selected alphabet", 
+                       schema = @Schema(type = "string", 
+                                        allowableValues = {"roman","arabic","japanese","korean","chinese"}, 
+                                        defaultValue = "roman"))
+                    String alphabet,
             @RequestParam("watermarkText")
             @Parameter(description = "The watermark text to add to the PDF file")
                     String watermarkText,
@@ -63,7 +68,7 @@ public class WatermarkController {
 
         // Load the input PDF
         PDDocument document = PDDocument.load(pdfFile.getInputStream());
-
+        String producer = document.getDocumentInformation().getProducer();
         // Create a page in the document
         for (PDPage page : document.getPages()) {
 
@@ -75,42 +80,39 @@ public class WatermarkController {
             graphicsState.setNonStrokingAlphaConstant(opacity);
             contentStream.setGraphicsStateParameters(graphicsState);
 
-            DetectorFactory.loadProfile("profiles");
+
+			String resourceDir = "";
+		    PDFont font = PDType1Font.HELVETICA_BOLD;
+		    switch (alphabet) {
+		        case "arabic":
+		            resourceDir = "static/fonts/NotoSansArabic-Regular.ttf";
+		            break;
+		        case "japanese":
+		            resourceDir = "static/fonts/Meiryo.ttf";
+		            break;
+		        case "korean":
+		            resourceDir = "static/fonts/malgun.ttf";
+		            break;
+		        case "chinese":
+		            resourceDir = "static/fonts/SimSun.ttf";
+		            break;
+		        case "roman":
+		        default:
+		            resourceDir = "static/fonts/NotoSans-Regular.ttf";
+		            break;
+		    }
+
             
-            Detector detector = DetectorFactory.create();
-            detector.append(watermarkText);
-            String lang = detector.detect();
-
-            System.out.println("Detected lang" + lang);
-            // Set font of watermark
-         // Load NotoSans-Regular font from resources
-            String resourceDir = "";
-            PDFont font = PDType1Font.HELVETICA_BOLD;
-            switch (lang) {
-                case "ar":
-                    resourceDir = "src/main/resources/static/fonts/NotoSansArabic-Regular.ttf";
-                    break;
-                case "ja":
-                    resourceDir = "src/main/resources/static/fonts/NotoSansJP-Regular.otf";
-                    break;
-                case "ko":
-                    resourceDir = "src/main/resources/static/fonts/NotoSansKR-Regular.otf";
-                    break;
-                case "zh-cn":
-                    resourceDir = "src/main/resources/static/fonts/NotoSansSC-Regular.otf";
-                    break;
-                default:
-                    font = PDType1Font.HELVETICA_BOLD;
-            }
-
             if(!resourceDir.equals("")) {
-	            ClassPathResource classPathResource = new ClassPathResource("static/fonts/NotoSans-Regular.ttf");
-	            File tempFile = File.createTempFile("NotoSans-Regular", ".ttf");
+	            ClassPathResource classPathResource = new ClassPathResource(resourceDir);
+	            String fileExtension = resourceDir.substring(resourceDir.lastIndexOf("."));
+	            File tempFile = File.createTempFile("NotoSansFont", fileExtension);
 	            try (InputStream is = classPathResource.getInputStream(); FileOutputStream os = new FileOutputStream(tempFile)) {
 	                IOUtils.copy(is, os);
 	            }
 	            
 	            font = PDType0Font.load(document, tempFile);
+	            tempFile.deleteOnExit();
             }
             contentStream.beginText();
             contentStream.setFont(font, fontSize);
@@ -127,11 +129,19 @@ public class WatermarkController {
             // Add the watermark text
             for (int i = 0; i < watermarkRows; i++) {
                 for (int j = 0; j < watermarkCols; j++) {
-                    contentStream.setTextMatrix(Matrix.getRotateInstance((float) Math.toRadians(rotation), j * watermarkWidth, i * watermarkHeight));
+                	
+                	if(producer.contains("Google Docs")) {
+                		//This fixes weird unknown google docs y axis rotation/flip issue 
+                		//TODO: Long term fix one day
+                        //contentStream.setTextMatrix(1, 0, 0, -1, j * watermarkWidth, pageHeight - i * watermarkHeight);
+                		Matrix matrix = new Matrix(1, 0, 0, -1, j * watermarkWidth, pageHeight - i * watermarkHeight);
+                		contentStream.setTextMatrix(matrix);
+                	} else {
+                		contentStream.setTextMatrix(Matrix.getRotateInstance((float) Math.toRadians(rotation), j * watermarkWidth, i * watermarkHeight));
+                	}
                     contentStream.showTextWithPositioning(new Object[] { watermarkText });
                 }
             }
-
             contentStream.endText();
 
             // Close the content stream

src/main/resources/templates/security/add-watermark.html

@@ -18,6 +18,17 @@
                                 <label th:text="#{watermark.selectText.1}"></label>
                                 <div th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false, accept='application/pdf')}"></div>
                             </div>
+
+                            <div class="form-group">
+	                            <label for="fontSize" th:text="#{alphabet}"></label> 
+	                            <select class="form-control" name="alphabet" id="alphabet-select">
+	                                <option value="romain">Roman</option>
+	                                <option value="arabic">العربية</option>
+	                                <option value="japanese">日本語</option>
+	                                <option value="korean">한국어</option>
+	                                <option value="chinese">简体中文</option>
+	                            </select>
+                            </div>
                             <div class="form-group">
                                 <label for="watermarkText" th:text="#{watermark.selectText.2}"></label> 
                                 <input type="text" id="watermarkText" name="watermarkText" class="form-control" placeholder="Stirling-PDF" required />