From a5c749701af2fe58fafff36f679a593bc3380421 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Sun, 3 Apr 2022 13:24:38 +0200
Subject: Make saucenao work when using pantalaimon (doesn't work for encrypted
 rooms)

---
 src/QuickMedia.cpp     | 22 ++++++++++++++++++++++
 src/plugins/Matrix.cpp | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+)

(limited to 'src')

diff --git a/src/QuickMedia.cpp b/src/QuickMedia.cpp
index da76335..101fa59 100644
--- a/src/QuickMedia.cpp
+++ b/src/QuickMedia.cpp
@@ -5246,6 +5246,26 @@ namespace QuickMedia {
         return message;
     }
 
+    static std::string pantalaimon_image_proxy_url_to_remote_image_url(Matrix *matrix, const std::string &image_url) {
+        std::string remote_homeserver_url = matrix->get_remote_homeserver_url();
+        if(!remote_homeserver_url.empty() && remote_homeserver_url.back() == '/')
+            remote_homeserver_url.pop_back();
+
+        std::string result_url = image_url;
+
+        if(string_starts_with(result_url, "http://"))
+            result_url.erase(result_url.begin(), result_url.begin() + 7);
+        else if(string_starts_with(result_url, "https://"))
+            result_url.erase(result_url.begin(), result_url.begin() + 8);
+
+        size_t path_index = result_url.find('/');
+        if(path_index == std::string::npos)
+            return remote_homeserver_url;
+
+        result_url.replace(0, path_index, remote_homeserver_url);
+        return result_url;
+    }
+
     bool Program::chat_page(MatrixChatPage *matrix_chat_page, RoomData *current_room) {
         assert(current_room);
         assert(strcmp(plugin_name, "matrix") == 0);
@@ -6627,6 +6647,8 @@ namespace QuickMedia {
                                 if(selected_item_message->type == MessageType::VIDEO)
                                     image_url = selected_item->thumbnail_url;
 
+                                image_url = pantalaimon_image_proxy_url_to_remote_image_url(matrix, image_url);
+
                                 std::vector<Tab> saucenao_tabs;
                                 saucenao_tabs.push_back(Tab{create_body(), std::make_unique<SaucenaoPage>(this, image_url, false), nullptr});
                                 page_loop(saucenao_tabs);
diff --git a/src/plugins/Matrix.cpp b/src/plugins/Matrix.cpp
index 144bbd8..5306349 100644
--- a/src/plugins/Matrix.cpp
+++ b/src/plugins/Matrix.cpp
@@ -3863,6 +3863,16 @@ namespace QuickMedia {
         if(home_server_json.IsString())
             this->homeserver_domain = home_server_json.GetString();
 
+        const rapidjson::Value &well_known_json = GetMember(json_root, "well_known");
+        if(well_known_json.IsObject()) {
+            const rapidjson::Value &homeserver_json = GetMember(well_known_json, "m.homeserver");
+            if(homeserver_json.IsObject()) {
+                const rapidjson::Value &base_url_json = GetMember(homeserver_json, "base_url");
+                if(base_url_json.IsString())
+                    well_known_base_url = base_url_json.GetString();
+            }
+        }
+
         // Use the user-provided homeserver instead of the one the server tells us about, otherwise this wont work with a proxy
         // such as pantalaimon
         json_root.AddMember("homeserver", rapidjson::StringRef(homeserver.c_str()), request_data.GetAllocator());
@@ -3906,6 +3916,7 @@ namespace QuickMedia {
         access_token.clear();
         homeserver.clear();
         homeserver_domain.clear();
+        well_known_base_url.clear();
         upload_limit.reset();
 
         return PluginResult::OK;
@@ -4103,6 +4114,16 @@ namespace QuickMedia {
         if(home_server_json.IsString())
             this->homeserver_domain = home_server_json.GetString();
 
+        const rapidjson::Value &well_known_json = GetMember(json_root, "well_known");
+        if(well_known_json.IsObject()) {
+            const rapidjson::Value &homeserver_json = GetMember(well_known_json, "m.homeserver");
+            if(homeserver_json.IsObject()) {
+                const rapidjson::Value &base_url_json = GetMember(homeserver_json, "base_url");
+                if(base_url_json.IsString())
+                    well_known_base_url = base_url_json.GetString();
+            }
+        }
+
         this->my_user_id = user_id_json.GetString();
         this->access_token = access_token_json.GetString();
         this->homeserver = homeserver_json.GetString();
@@ -4527,6 +4548,21 @@ namespace QuickMedia {
         return homeserver_domain;
     }
 
+    std::string Matrix::get_remote_homeserver_url() const {
+        if(!well_known_base_url.empty())
+            return well_known_base_url;
+
+        if(!homeserver_domain.empty()) {
+            if(string_starts_with(homeserver_domain, "http://") || string_starts_with(homeserver_domain, "https://"))
+                return homeserver_domain;
+            return "https://" + homeserver_domain; // TODO: What if domain does not use https?
+        }
+
+        if(string_starts_with(homeserver, "http://") || string_starts_with(homeserver, "https://"))
+            return homeserver;
+        return "https://" + homeserver; // TODO: What if domain does not use https?
+    }
+
     RoomData* Matrix::get_room_by_id(const std::string &id) {
         std::lock_guard<std::recursive_mutex> lock(room_data_mutex);
         auto room_it = room_data_by_id.find(id);
-- 
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