From a5be59329daa54c8afeab01a8ee530fca07baaf7 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Fri, 10 Jul 2020 02:06:44 +0200
Subject: Fallback to invidio.us if youtube-dl fails (happens with videos that
 require age verification)

---
 src/Program.c      |  3 ++-
 src/QuickMedia.cpp | 45 +++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 45 insertions(+), 3 deletions(-)

(limited to 'src')

diff --git a/src/Program.c b/src/Program.c
index 2509f6f..2c6759e 100644
--- a/src/Program.c
+++ b/src/Program.c
@@ -43,7 +43,8 @@ int exec_program(const char **args, ProgramOutputCallback output_callback, void
         close(fd[WRITE_END]);
 
         execvp(args[0], args);
-        return 0;
+        perror("execvp");
+        exit(127);
     } else { /* parent */
         close(fd[WRITE_END]);
 
diff --git a/src/QuickMedia.cpp b/src/QuickMedia.cpp
index 60fc523..e30d453 100644
--- a/src/QuickMedia.cpp
+++ b/src/QuickMedia.cpp
@@ -651,6 +651,35 @@ namespace QuickMedia {
         #endif
     }
 
+    static bool youtube_url_extract_id(const std::string &youtube_url, std::string &youtube_video_id) {
+        size_t index = youtube_url.find("youtube.com/watch?v=");
+        if(index != std::string::npos) {
+            index += 20;
+            size_t end_index = youtube_url.find("&", index);
+            if(end_index == std::string::npos)
+                end_index = youtube_url.size();
+            youtube_video_id = youtube_url.substr(index, end_index - index);
+            return true;
+        }
+
+        index = youtube_url.find("youtu.be/");
+        if(index != std::string::npos) {
+            index += 9;
+            size_t end_index = youtube_url.find("?", index);
+            if(end_index == std::string::npos)
+                end_index = youtube_url.size();
+            youtube_video_id = youtube_url.substr(index, end_index - index);
+            return true;
+        }
+
+        return false;
+    }
+
+    static bool youtube_dl_can_download_video(const std::string &video_url) {
+        const char *args[] = { "youtube-dl", "--skip-download", "--", video_url.c_str(), nullptr };
+        return exec_program(args, nullptr, nullptr) == 0;
+    }
+
     void Program::video_content_page() {
         search_bar->onTextUpdateCallback = nullptr;
         search_bar->onTextSubmitCallback = nullptr;
@@ -671,10 +700,22 @@ namespace QuickMedia {
 
         auto load_video_error_check = [this, &video_player, previous_page]() mutable {
             watched_videos.insert(content_url);
-            VideoPlayer::Error err = video_player->load_video(content_url.c_str(), window.getSystemHandle());
+            std::string video_url = content_url;
+            
+            std::string youtube_video_id;
+            if(youtube_url_extract_id(video_url, youtube_video_id)) {
+                // This can fail for example if the video requires age vertification...
+                // TODO: Remove this when youtube-dl is modified to work with videos that require age verification.
+                if(!youtube_dl_can_download_video(video_url)) {
+                    // Im sorry invidio.us server... this will be removed later and it only happens when youtube-dl fails!
+                    video_url = "https://www.invidio.us/latest_version?id=" + youtube_video_id + "&itag=22";
+                }
+            }
+
+            VideoPlayer::Error err = video_player->load_video(video_url.c_str(), window.getSystemHandle());
             if(err != VideoPlayer::Error::OK) {
                 std::string err_msg = "Failed to play url: ";
-                err_msg += content_url;
+                err_msg += video_url;
                 show_notification("Video player", err_msg.c_str(), Urgency::CRITICAL);
                 current_page = previous_page;
             }
-- 
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