Load data: urls in markdown

app/src/main/java/com/github/gotify/messages/MessagesActivity.java

@@ -59,6 +59,7 @@ import com.github.gotify.messages.provider.MessageDeletion;
 import com.github.gotify.messages.provider.MessageFacade;
 import com.github.gotify.messages.provider.MessageState;
 import com.github.gotify.messages.provider.MessageWithImage;
+import com.github.gotify.picasso.PicassoDataRequestHandler;
 import com.github.gotify.service.WebSocketService;
 import com.google.android.material.navigation.NavigationView;
 import com.google.android.material.snackbar.BaseTransientBottomBar;
@@ -247,7 +248,10 @@ public class MessagesActivity extends AppCompatActivity
 
         OkHttp3Downloader downloader = new OkHttp3Downloader(builder.build());
 
-        return new Picasso.Builder(this).downloader(downloader).build();
+        return new Picasso.Builder(this)
+                .addRequestHandler(new PicassoDataRequestHandler())
+                .downloader(downloader)
+                .build();
     }
 
     private void initDrawer() {

app/src/main/java/com/github/gotify/picasso/PicassoDataRequestHandler.java

@@ -0,0 +1,41 @@
+package com.github.gotify.picasso;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.util.Base64;
+import com.github.gotify.log.Log;
+import com.squareup.picasso.Picasso;
+import com.squareup.picasso.Request;
+import com.squareup.picasso.RequestHandler;
+
+/**
+ * Adapted from https://github.com/square/picasso/issues/1395#issuecomment-220929377 By
+ * https://github.com/SmartDengg
+ */
+public class PicassoDataRequestHandler extends RequestHandler {
+
+    private static final String DATA_SCHEME = "data";
+
+    @Override
+    public boolean canHandleRequest(Request data) {
+        String scheme = data.uri.getScheme();
+        return DATA_SCHEME.equalsIgnoreCase(scheme);
+    }
+
+    @Override
+    public Result load(Request request, int networkPolicy) {
+        String uri = request.uri.toString();
+        String imageDataBytes = uri.substring(uri.indexOf(",") + 1);
+        byte[] bytes = Base64.decode(imageDataBytes.getBytes(), Base64.DEFAULT);
+        Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
+
+        if (bitmap == null) {
+            String show = uri.length() > 50 ? uri.substring(0, 49) + "..." : uri;
+            RuntimeException malformed = new RuntimeException("Malformed data uri: " + show);
+            Log.e("Could not load image", malformed);
+            throw malformed;
+        }
+
+        return new Result(bitmap, Picasso.LoadedFrom.NETWORK);
+    }
+}