From 5b11322c33ef61d3aa8d6bc9c9bc0355f35afa52 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Thu, 20 May 2021 19:06:14 +0200
Subject: Restrict image size to body size

---
 src/plugins/Matrix.cpp | 29 +++++++++++++++++------------
 1 file changed, 17 insertions(+), 12 deletions(-)

(limited to 'src/plugins/Matrix.cpp')

diff --git a/src/plugins/Matrix.cpp b/src/plugins/Matrix.cpp
index afa8738..e015ada 100644
--- a/src/plugins/Matrix.cpp
+++ b/src/plugins/Matrix.cpp
@@ -1631,14 +1631,20 @@ namespace QuickMedia {
     static std::string thumbnail_url_extract_media_id(const std::string &media_url) {
         size_t start = 0;
         size_t end = media_url.size();
-        if(strncmp(media_url.c_str(), "mxc://", 6) == 0)
-            start = 6;
+        if(strncmp(media_url.c_str(), "mxc://", 6) != 0)
+            return "";
+        
+        start = 6;
         if(media_url.size() >= start + 5 && strncmp(media_url.c_str() + media_url.size() - 5, "#auto", 5) == 0)
             end = media_url.size() - 5;
+
         return media_url.substr(start, end - start);
     }
 
     static std::string get_thumbnail_url(const std::string &homeserver, const std::string &mxc_id) {
+        if(mxc_id.empty())
+            return "";
+
         std::string size = std::to_string(int(32 * get_ui_scale()));
         return homeserver + "/_matrix/media/r0/thumbnail/" + mxc_id + "?width=" + size + "&height=" + size + "&method=crop";
     }
@@ -1749,10 +1755,11 @@ namespace QuickMedia {
             const rapidjson::Value &thumbnail_url_json = GetMember(info_json, "thumbnail_url");
             if(thumbnail_url_json.IsString()) {
                 std::string thumbnail_str = thumbnail_url_json.GetString();
-                if(strncmp(thumbnail_str.c_str(), "mxc://", 6) == 0) {
-                    thumbnail_str.erase(thumbnail_str.begin(), thumbnail_str.begin() + 6);
-                    return homeserver + "/_matrix/media/r0/download/" + std::move(thumbnail_str);
-                }
+                if(strncmp(thumbnail_str.c_str(), "mxc://", 6) != 0)
+                    return "";
+
+                thumbnail_str.erase(thumbnail_str.begin(), thumbnail_str.begin() + 6);
+                return homeserver + "/_matrix/media/r0/download/" + std::move(thumbnail_str);
             }
         }
 
@@ -2287,11 +2294,10 @@ namespace QuickMedia {
                     continue;
 
                 const rapidjson::Value &url_json = GetMember(content_json, "url");
-                if(!url_json.IsString())
+                if(!url_json.IsString() || strncmp(url_json.GetString(), "mxc://", 6) != 0)
                     continue;
 
-                std::string url_json_str = url_json.GetString() + 6;
-                room_data->set_avatar_url(get_thumbnail_url(homeserver, thumbnail_url_extract_media_id(url_json_str)));
+                room_data->set_avatar_url(get_thumbnail_url(homeserver, thumbnail_url_extract_media_id(url_json.GetString())));
                 room_data->avatar_is_fallback = false;
             } else if(strcmp(type_json.GetString(), "m.room.avatar") == 0) {
                 const rapidjson::Value &content_json = GetMember(event_item_json, "content");
@@ -2299,11 +2305,10 @@ namespace QuickMedia {
                     continue;
 
                 const rapidjson::Value &url_json = GetMember(content_json, "url");
-                if(!url_json.IsString())
+                if(!url_json.IsString() || strncmp(url_json.GetString(), "mxc://", 6) != 0)
                     continue;
 
-                std::string url_json_str = url_json.GetString() + 6;
-                room_data->set_avatar_url(get_thumbnail_url(homeserver, thumbnail_url_extract_media_id(url_json_str)));
+                room_data->set_avatar_url(get_thumbnail_url(homeserver, thumbnail_url_extract_media_id(url_json.GetString())));
                 room_data->avatar_is_fallback = false;
             } else if(strcmp(type_json.GetString(), "m.room.topic") == 0) {
                 const rapidjson::Value &content_json = GetMember(event_item_json, "content");
-- 
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