From 370698164590b602e6b0fc7cc579c44a92c13473 Mon Sep 17 00:00:00 2001
From: Daniel Gultsch <daniel@gultsch.de>
Date: Thu, 14 Oct 2021 17:30:55 +0200
Subject: [PATCH] fix mime type detection in urls that have query params or an
 anchor

---
 .../siacs/conversations/utils/MimeUtils.java  | 39 +++++++++++++------
 1 file changed, 27 insertions(+), 12 deletions(-)

diff --git a/src/main/java/eu/siacs/conversations/utils/MimeUtils.java b/src/main/java/eu/siacs/conversations/utils/MimeUtils.java
index 76d4911b8..c0a6f4cfd 100644
--- a/src/main/java/eu/siacs/conversations/utils/MimeUtils.java
+++ b/src/main/java/eu/siacs/conversations/utils/MimeUtils.java
@@ -21,6 +21,8 @@ import android.net.Uri;
 import android.provider.OpenableColumns;
 import android.util.Log;
 
+import com.google.common.base.Strings;
+
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
@@ -274,6 +276,8 @@ public final class MimeUtils {
         add("image/ico", "ico");
         add("image/ief", "ief");
         add("image/heic", "heic");
+        add("image/heif", "heif");
+        add("image/avif", "avif");
         // add ".jpg" first so it will be the default for guessExtensionFromMimeType
         add("image/jpeg", "jpg");
         add("image/jpeg", "jpeg");
@@ -587,22 +591,33 @@ public final class MimeUtils {
     }
 
     public static String extractRelevantExtension(final String path, final boolean ignoreCryptoExtension) {
-        if (path == null || path.isEmpty()) {
+        if (Strings.isNullOrEmpty(path)) {
             return null;
         }
 
-        String filename = path.substring(path.lastIndexOf('/') + 1).toLowerCase();
-        int dotPosition = filename.lastIndexOf(".");
+        final String filenameQueryAnchor = path.substring(path.lastIndexOf('/') + 1);
+        final String filenameQuery = cutBefore(filenameQueryAnchor, '#');
+        final String filename = cutBefore(filenameQuery, '?');
+        final int dotPosition = filename.lastIndexOf('.');
 
-        if (dotPosition != -1) {
-            String extension = filename.substring(dotPosition + 1);
-            // we want the real file extension, not the crypto one
-            if (ignoreCryptoExtension && Transferable.VALID_CRYPTO_EXTENSIONS.contains(extension)) {
-                return extractRelevantExtension(filename.substring(0, dotPosition));
-            } else {
-                return extension;
-            }
+        if (dotPosition == -1) {
+            return null;
+        }
+        final String extension = filename.substring(dotPosition + 1);
+        // we want the real file extension, not the crypto one
+        if (ignoreCryptoExtension && Transferable.VALID_CRYPTO_EXTENSIONS.contains(extension)) {
+            return extractRelevantExtension(filename.substring(0, dotPosition));
+        } else {
+            return extension;
+        }
+    }
+
+    private static String cutBefore(final String input, final char c) {
+        final int position = input.indexOf(c);
+        if (position > 0) {
+            return input.substring(0, position);
+        } else {
+            return input;
         }
-        return null;
     }
 }