From 16300727d1d6e1e03a0177bd024c28d699a144e3 Mon Sep 17 00:00:00 2001
From: Daniel Gultsch <daniel@gultsch.de>
Date: Tue, 21 Jul 2020 10:19:21 +0200
Subject: [PATCH] try to guess mime type via extension in display name

---
 .../siacs/conversations/utils/MimeUtils.java  | 39 ++++++++++++++-----
 1 file changed, 30 insertions(+), 9 deletions(-)

diff --git a/src/main/java/eu/siacs/conversations/utils/MimeUtils.java b/src/main/java/eu/siacs/conversations/utils/MimeUtils.java
index 530310f0b..1aea44565 100644
--- a/src/main/java/eu/siacs/conversations/utils/MimeUtils.java
+++ b/src/main/java/eu/siacs/conversations/utils/MimeUtils.java
@@ -16,7 +16,9 @@
 package eu.siacs.conversations.utils;
 
 import android.content.Context;
+import android.database.Cursor;
 import android.net.Uri;
+import android.provider.OpenableColumns;
 import android.util.Log;
 
 import java.io.File;
@@ -538,18 +540,20 @@ public final class MimeUtils {
         String mimeType;
         try {
             mimeType = context.getContentResolver().getType(uri);
-        } catch (Throwable throwable) {
+        } catch (final Throwable throwable) {
             mimeType = null;
         }
         // try the extension
-        if ((mimeType == null || mimeType.equals("application/octet-stream")) && uri.getPath() != null) {
-            String path = uri.getPath();
-            int start = path.lastIndexOf('.') + 1;
-            if (start < path.length()) {
-                final String guess = MimeUtils.guessMimeTypeFromExtension(path.substring(start));
-                if (guess != null) {
-                    mimeType = guess;
-                }
+        if (mimeType == null || mimeType.equals("application/octet-stream")) {
+            final String path = uri.getPath();
+            if (path != null) {
+                mimeType = guessFromPath(path);
+            }
+        }
+        if (mimeType == null && "content".equals(uri.getScheme())) {
+            final String name = getDisplayName(context, uri);
+            if (name != null) {
+                mimeType = guessFromPath(name);
             }
         }
         // sometimes this works (as with the commit content api)
@@ -559,6 +563,23 @@ public final class MimeUtils {
         return mimeType;
     }
 
+    private static String getDisplayName(final Context context, final Uri uri) {
+        try (Cursor cursor = context.getContentResolver().query(uri, null, null, null, null)) {
+            if (cursor != null && cursor.moveToFirst()) {
+                return cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
+            }
+        }
+        return null;
+    }
+
+    private static String guessFromPath(final String path) {
+        final int start = path.lastIndexOf('.') + 1;
+        if (start < path.length()) {
+            return MimeUtils.guessMimeTypeFromExtension(path.substring(start));
+        }
+        return null;
+    }
+
     public static String extractRelevantExtension(URL url) {
         String path = url.getPath();
         return extractRelevantExtension(path, true);