Add a key importer for plain text aegis databases

app/src/main/java/me/impy/aegis/crypto/KeyInfo.java

@@ -16,7 +16,7 @@ public class KeyInfo implements Serializable {
     private int _digits = 6;
     private int _period = 30;
 
-    public String getURL() throws Exception {
+    public String getURL() {
         Uri.Builder builder = new Uri.Builder();
         builder.scheme("otpauth");
         builder.authority(_type);

app/src/main/java/me/impy/aegis/db/DatabaseEntry.java

@@ -1,5 +1,6 @@
 package me.impy.aegis.db;
 
+import org.json.JSONException;
 import org.json.JSONObject;
 
 import java.io.Serializable;
@@ -17,7 +18,7 @@ public class DatabaseEntry implements Serializable {
         _info = info;
     }
 
-    public JSONObject serialize() throws Exception {
+    public JSONObject serialize() throws JSONException {
         JSONObject obj = new JSONObject();
         obj.put("id", _id);
         obj.put("name", _name);

app/src/main/java/me/impy/aegis/ext/AegisImporter.java

@@ -0,0 +1,30 @@
+package me.impy.aegis.ext;
+
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+import java.util.List;
+
+import me.impy.aegis.db.Database;
+import me.impy.aegis.db.DatabaseEntry;
+
+public class AegisImporter extends KeyConverter {
+
+    public AegisImporter(InputStream stream) {
+        super(stream);
+    }
+
+    @Override
+    public List<DatabaseEntry> convert() throws Exception {
+        int read;
+        byte[] buffer = new byte[4096];
+        ByteArrayOutputStream stream = new ByteArrayOutputStream();
+        while ((read = _stream.read(buffer, 0, buffer.length)) != -1) {
+            stream.write(buffer, 0, read);
+        }
+
+        byte[] bytes = stream.toByteArray();
+        Database db = new Database();
+        db.deserialize(bytes);
+        return db.getKeys();
+    }
+}