QR placeholder generation servlet

2 files changed, 186 insertions, 0 deletions

diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/config/WebConfiguration.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/config/WebConfiguration.java
index 0ad96b04..4ef320a1 100644
--- a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/config/WebConfiguration.java
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/config/WebConfiguration.java
@@ -93,6 +93,8 @@ public class WebConfiguration implements IConfigurationConstants {
 	public static final String UPLOAD_MAX_FILESIZE = "web.upload.filesizeMax";
 	public static final String UPLOAD_MAX_REQUESTSIZE = "web.upload.RequestsizeMax";
 	
+	public static final String PLACEHOLDER_GENERATOR_ENABLED = "qr.placeholder.generator.enabled";
+	
 	private static final int THRESHOLD_SIZE = 1024 * 1024 * 3; // 3MB
 	private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB
 	private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB
@@ -308,6 +310,16 @@ public class WebConfiguration implements IConfigurationConstants {
 		return false;
 	}
 	
+	public static boolean isQRPlaceholderGenerator() {
+		String value = properties.getProperty(PLACEHOLDER_GENERATOR_ENABLED);
+		if (value != null) {
+			if (value.equals("true")) {
+				return true;
+			}
+		}
+		return false;
+	}
+	
 	public static String getMoaURL(String keyIdentifier) {
 		return properties.getProperty(MOA_LIST + "." + keyIdentifier + "." + MOA_URL);
 	}
diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/PlaceholderGeneratorServlet.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/PlaceholderGeneratorServlet.java
new file mode 100644
index 00000000..bd64c75d
--- /dev/null
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/servlets/PlaceholderGeneratorServlet.java
@@ -0,0 +1,174 @@
+package at.gv.egiz.pdfas.web.servlets;
+
+import java.awt.Color;
+import java.awt.Font;
+import java.awt.Graphics;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+import javax.imageio.ImageIO;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.http.HttpStatus;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.zxing.WriterException;
+
+import at.gv.egiz.pdfas.lib.impl.placeholder.PlaceholderExtractorConstants;
+import at.gv.egiz.pdfas.lib.impl.placeholder.SignaturePlaceholderData;
+import at.gv.egiz.pdfas.web.config.WebConfiguration;
+import at.gv.egiz.pdfas.web.helper.QRCodeGenerator;
+
+public class PlaceholderGeneratorServlet extends HttpServlet implements PlaceholderExtractorConstants {
+
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = -5854130802422496977L;
+
+	public static final String PARAM_ID = "id";
+	public static final String PARAM_PROFILE = "profile";
+	
+	private static final Logger logger = LoggerFactory
+			.getLogger(ExternSignServlet.class);
+
+	@Override
+	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+		this.doProcess(req, resp);
+	}
+
+	@Override
+	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+		this.doProcess(req, resp);
+	}
+	
+	protected void doProcess(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+		
+		if(!WebConfiguration.isQRPlaceholderGenerator()) {
+			logger.info("QR Placeholder is disabled by configuration (see {})" + WebConfiguration.PLACEHOLDER_GENERATOR_ENABLED);
+			resp.sendError(HttpStatus.SC_NOT_FOUND);
+			return;
+		}
+		
+		String baseImage = "/img/PLATZHALTER-SIG.png";
+		
+		String id = req.getParameter(PARAM_ID);
+		String profile = req.getParameter(PARAM_PROFILE);
+		
+		String buildString = QR_PLACEHOLDER_IDENTIFIER;
+		
+		String filename = "placeholder";
+		
+		if(id != null && !id.isEmpty()) {
+			id = id.replaceAll("[^a-zA-Z0-9]", "_");
+			buildString = buildString + ";" + SignaturePlaceholderData.ID_KEY + "=" + id;
+			filename = filename + "_" + id;
+		}
+		
+		if(profile != null && !profile.isEmpty()) {
+			buildString = buildString + ";" + SignaturePlaceholderData.PROFILE_KEY + "=" + profile;
+			
+			if(profile.endsWith("_EN")) {
+				baseImage = "/img/PLACEHOLDER-SIG_EN.png";
+				filename = filename + "_en";
+			} else {
+				filename = filename + "_de";
+			}
+		}
+		
+		filename = filename + ".png";
+		
+		logger.info("generating qr placeholder for '{}' as {}", buildString, filename);
+		
+		//if(id != null || profile != null) {
+			// We need to generate the image
+			
+			InputStream is = this.getClass().getClassLoader().getResourceAsStream(baseImage);
+			if(is == null) {
+				logger.warn("Cannot open resource {} to generator QR placeholder", baseImage);
+				resp.sendError(HttpStatus.SC_NOT_FOUND);
+				return;
+			}
+			
+			ByteArrayOutputStream baos = new ByteArrayOutputStream();
+			
+			// generate QR code
+			try {
+				QRCodeGenerator.generateQRCode(buildString, baos, 90);
+			} catch (WriterException e) {
+				logger.warn("Failed to generate QR Code for placeholder generationg", e);
+				resp.sendError(HttpStatus.SC_INTERNAL_SERVER_ERROR);
+				return;
+			}
+			
+			baos.close();
+			
+			BufferedImage base = ImageIO.read(is);
+			BufferedImage qr = ImageIO.read(new ByteArrayInputStream(baos.toByteArray()));
+			
+			BufferedImage off_Image =
+					  new BufferedImage(250, 98,
+					                    BufferedImage.TYPE_INT_ARGB);
+			
+			Graphics g = off_Image.getGraphics();
+			g.drawImage(base, 0, 0, 250, 98, 0, 0, base.getWidth(), base.getHeight(), null);
+			g.drawImage(qr, 4, 4, 94, 94, 0, 0, qr.getWidth(), qr.getHeight(), null);
+			g.setColor(Color.WHITE);
+			g.fillRect(94, 4, 152, 90);
+			//g.(x, y, width, height);
+			Font writeFont = new Font(Font.SANS_SERIF, Font.BOLD, 14);
+			g.setFont(writeFont);
+			g.setColor(Color.BLACK);
+			
+			if(profile != null && profile.endsWith("_EN")) {
+				g.drawString("placeholder for", 102, 13+18);
+				g.drawString("the electronic", 102, 13+18 + 18);
+				g.drawString("signature", 102, 13+18 + 18 + 18);
+			} else {
+				g.drawString("Platzhalter für", 102, 13+18);
+				g.drawString("die elektronische", 102, 13+18 + 18);
+				g.drawString("Signatur", 102, 13+18 + 18 + 18);
+			}
+			if(id != null && !id.isEmpty()) {
+				
+				Font nrFont = new Font(Font.SANS_SERIF, Font.BOLD | Font.ITALIC, 14);
+				g.setFont(nrFont);
+				
+				g.drawString("NR: " + id, 102, 13+18 + 18 + 18 + 18);
+			}
+			
+			logger.info("serving qr placeholder for '{}'", buildString);
+			resp.setContentType("image/png");
+			resp.setHeader("Cache-Control", "private, no-store, no-cache, must-revalidate");
+			resp.setHeader("Pragma", "no-cache");
+			resp.setHeader ("Content-Disposition", "attachment; filename=\""+filename+"\""); 
+
+			ImageIO.write(off_Image, "PNG", resp.getOutputStream());
+			return;
+		/*} else {
+			// just use the template
+			InputStream is = this.getClass().getClassLoader().getResourceAsStream(baseImage);
+			if(is == null) {
+				logger.warn("Cannot open resource {} to generator QR placeholder", baseImage);
+				resp.sendError(HttpStatus.SC_NOT_FOUND);
+				return;
+			} else {
+				logger.info("serving default qr placeholder");
+				resp.setContentType("image/png");
+				resp.setHeader("Cache-Control", "private, no-store, no-cache, must-revalidate");
+				resp.setHeader("Pragma", "no-cache");
+				IOUtils.copy(is, resp.getOutputStream());
+				return;
+			}
+		}*/
+	}
+	
+}