X-Git-Url: https://git.mdrn.pl/wl-app.git/blobdiff_plain/48b2fe9f7c2dc3d9aeaaa6dbfb27c7da4f3235ff..269195b3729c1bdc22e9053ee4ebca667ea8549d:/Android/r2-streamer/r2-parser/src/main/java/org/readium/r2_streamer/parser/EncryptionParser.java

diff --git a/Android/r2-streamer/r2-parser/src/main/java/org/readium/r2_streamer/parser/EncryptionParser.java b/Android/r2-streamer/r2-parser/src/main/java/org/readium/r2_streamer/parser/EncryptionParser.java
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+++ b/Android/r2-streamer/r2-parser/src/main/java/org/readium/r2_streamer/parser/EncryptionParser.java
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+package org.readium.r2_streamer.parser;
+
+import org.readium.r2_streamer.model.container.Container;
+import org.readium.r2_streamer.model.publication.Encryption;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.NodeList;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Created by gautam chibde on 31/5/17.
+ */
+
+public class EncryptionParser {
+
+    private static final String TAG = EncryptionParser.class.getSimpleName();
+
+    /**
+     * parse file encryption.xml located at META-INF/encryption.xml
+     * <p>
+     * content of the encryption file are saved as {@link Encryption} where path to
+     * encrypted file is saved in {@link Encryption#profile} and
+     * encryption algorithm in {@link Encryption#algorithm}
+     */
+    public static List<Encryption> parseEncryption(Container container) {
+        String containerPath = "META-INF/encryption.xml";
+        try {
+            String containerData = container.rawData(containerPath);
+            Document encryptionDocument = EpubParser.xmlParser(containerData);
+            if (encryptionDocument == null) {
+                throw new EpubParserException("Error while paring META-INF/encryption.xml");
+            }
+            NodeList element = encryptionDocument.getDocumentElement().getElementsByTagName("EncryptedData");
+
+            List<Encryption> encryptions = new ArrayList<>();
+            for (int i = 0; i < element.getLength(); i++) {
+                Encryption encryption = new Encryption();
+                Element algorithmElement = (Element) ((Element) element.item(i)).getElementsByTagName("EncryptionMethod").item(0);
+                Element pathElement = (Element) ((Element) ((Element) element.item(i)).getElementsByTagName("CipherData").item(0)).getElementsByTagName("CipherReference").item(0);
+                if (algorithmElement != null) {
+                    if (algorithmElement.hasAttribute("Algorithm")) {
+                        encryption.setAlgorithm(algorithmElement.getAttribute("Algorithm"));
+                    }
+                }
+                if (pathElement != null) {
+                    if (pathElement.hasAttribute("URI")) {
+                        encryption.setProfile(pathElement.getAttribute("URI"));
+                    }
+                }
+                //TODO properties
+                //TODO LCP
+                encryptions.add(encryption);
+            }
+            return encryptions;
+        } catch (EpubParserException e) {
+            e.printStackTrace();
+            return null;
+        } catch (NullPointerException e) {
+            System.out.println(TAG + " META-INF/encryption.xml not found " + e);
+            return null;
+        }
+    }
+}