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authorTobias Kellner <tobias.kellner@iaik.tugraz.at>2016-10-10 18:35:33 +0200
committerTobias Kellner <tobias.kellner@iaik.tugraz.at>2016-10-25 17:00:13 +0200
commit5962867b411bc53bf14938b0312414f040986b54 (patch)
tree91c25af9dd61249f047f0567e0f72b87abda3091 /pdf-over-signator
parent1f614332bcd103229f15f51157a52824005fba96 (diff)
downloadpdf-over-5962867b411bc53bf14938b0312414f040986b54.tar.gz
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Cache (and scale) custom emblem images
Diffstat (limited to 'pdf-over-signator')
-rw-r--r--pdf-over-signator/src/main/java/at/asit/pdfover/signator/CachedFileNameEmblem.java150
-rw-r--r--pdf-over-signator/src/main/java/at/asit/pdfover/signator/SignatureParameter.java4
2 files changed, 152 insertions, 2 deletions
diff --git a/pdf-over-signator/src/main/java/at/asit/pdfover/signator/CachedFileNameEmblem.java b/pdf-over-signator/src/main/java/at/asit/pdfover/signator/CachedFileNameEmblem.java
new file mode 100644
index 00000000..dc54d84a
--- /dev/null
+++ b/pdf-over-signator/src/main/java/at/asit/pdfover/signator/CachedFileNameEmblem.java
@@ -0,0 +1,150 @@
+/*
+ * Copyright 2012 by A-SIT, Secure Information Technology Center Austria
+ *
+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * http://joinup.ec.europa.eu/software/page/eupl
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ */
+package at.asit.pdfover.signator;
+
+// Imports
+import java.awt.Graphics2D;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.Properties;
+
+import javax.imageio.ImageIO;
+
+import org.apache.commons.codec.digest.DigestUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ *
+ */
+public class CachedFileNameEmblem implements Emblem {
+ /**
+ * SLF4J Logger instance
+ **/
+ private static final Logger log = LoggerFactory
+ .getLogger(CachedFileNameEmblem.class);
+
+ private String fileName = null;
+
+ /**
+ * Constructor
+ * @param filename
+ */
+ public CachedFileNameEmblem(String filename) {
+ this.fileName = filename;
+ }
+
+ private String getFileHash(String filename) throws IOException {
+ InputStream is = Files.newInputStream(Paths.get(this.fileName));
+ return DigestUtils.md5Hex(is);
+ }
+
+ /* (non-Javadoc)
+ * @see at.asit.pdfover.signator.Emblem#getFileName()
+ */
+ @Override
+ public String getFileName() {
+ final String fileDir = System.getProperty("user.home") + File.separator + ".pdf-over"; //$NON-NLS-1$ //$NON-NLS-2$
+ final String imgFileName = ".emblem"; //$NON-NLS-1$
+ final String imgFileExt = "png"; //$NON-NLS-1$
+ final String propFileName = ".emblem.properties"; //$NON-NLS-1$
+
+ final String imgProp = "IMG"; //$NON-NLS-1$
+ final String hshProp = "HSH"; //$NON-NLS-1$
+ final int maxWidth = 480;
+ final int maxHeight = 600;
+
+ String emblemImg = this.fileName;
+ String emblemHsh = null;
+ String cachedEmblemFileName = fileDir + File.separator + imgFileName + "." + imgFileExt; //$NON-NLS-1$
+
+ if (emblemImg == null || !(new File(emblemImg).exists()))
+ return null;
+
+ Properties emblemProps = new Properties();
+ // compare cache, try to load if match
+ try {
+ InputStream in = new FileInputStream(new File(fileDir, propFileName));
+ emblemProps.load(in);
+ if (emblemImg.equals(emblemProps.getProperty(imgProp))) {
+ emblemHsh = getFileHash(emblemImg);
+ if (emblemHsh.equals(emblemProps.getProperty(hshProp))) {
+ log.debug("Emblem cache hit: " + cachedEmblemFileName); //$NON-NLS-1$
+ return cachedEmblemFileName; //$NON-NLS-1$
+ }
+ }
+ log.debug("Emblem cache miss");
+ } catch (Exception e) {
+ log.warn("Can't load emblem cache", e); //$NON-NLS-1$
+ }
+
+ try {
+ // create new cache
+ if (emblemHsh == null)
+ emblemHsh = getFileHash(emblemImg);
+ emblemProps.setProperty(imgProp, emblemImg);
+ emblemProps.setProperty(hshProp, emblemHsh);
+ BufferedImage img = ImageIO.read(new File(emblemImg));
+ int oheight = img.getHeight();
+ int owidth = img.getWidth();
+ double ratio = (double)owidth/(double)oheight;
+
+ int height = oheight;
+ int width = owidth;
+ if (height > maxHeight) {
+ height = maxHeight;
+ width = (int) (maxHeight * ratio);
+ }
+ if (width > maxWidth) {
+ width = maxWidth;
+ height = (int) (maxWidth / ratio);
+ }
+ BufferedImage cacheImg = img;
+ if (width != owidth || height == oheight) {
+ //scale image
+ log.debug("Scaling emblem: " + owidth + "x" + oheight + " to " + width + "x" + height); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
+ cacheImg = new BufferedImage(width, height, img.getType() == 0 ? BufferedImage.TYPE_INT_ARGB : img.getType());
+ Graphics2D g = cacheImg.createGraphics();
+ g.drawImage(img, 0, 0, width, height, null);
+ g.dispose();
+ }
+
+ File file = new File(fileDir, imgFileName + "." + imgFileExt); //$NON-NLS-1$
+ ImageIO.write(cacheImg, imgFileExt, file); // ignore returned boolean
+ OutputStream out = new FileOutputStream(new File(fileDir, propFileName));
+ emblemProps.store(out, null);
+ } catch (IOException e) {
+ log.error("Can't save emblem cache", e); //$NON-NLS-1$
+ return this.fileName;
+ }
+ return cachedEmblemFileName;
+ }
+
+ /**
+ * Return the original filename
+ * @return the original filename
+ */
+ public String getOriginalFileName() {
+ return this.fileName;
+ }
+}
diff --git a/pdf-over-signator/src/main/java/at/asit/pdfover/signator/SignatureParameter.java b/pdf-over-signator/src/main/java/at/asit/pdfover/signator/SignatureParameter.java
index 8b08e3dd..8e1b965e 100644
--- a/pdf-over-signator/src/main/java/at/asit/pdfover/signator/SignatureParameter.java
+++ b/pdf-over-signator/src/main/java/at/asit/pdfover/signator/SignatureParameter.java
@@ -162,9 +162,9 @@ public abstract class SignatureParameter {
public abstract SignatureDimension getPlaceholderDimension();
/**
- * Gets the Dimension to display the Placeholder
+ * Gets the Placeholder image
*
- * @return the placeholder dimensions
+ * @return the placeholder image
*/
public abstract Image getPlaceholder();