Take cover art from YT if possible

src/main.rs

@@ -57,18 +57,35 @@ fn main() -> Result<(), Box<dyn Error>> {
             debug!("Cached cover failure");
             None
         } else {
-            let url = lb.cover_art(&track, &artist, release_name.as_deref(), 0);
+            let youtube_cover_url = metadata.additional_info.as_ref()
+                .and_then(|info| info.music_service_name.as_ref())
+                .filter(
+                    |service|
+                    ["YouTube", "YouTube Music"].contains(&service.as_str())
+                )
+                .and_then(|_| metadata.additional_info.as_ref())
+                .and_then(|info| info.origin_url.as_ref())
+                .and_then(|url| extract_youtube_video_id(url))
+                .map(|video_id| format!(
+                    "https://img.youtube.com/vi/{}/sddefault.jpg",
+                    video_id
+                ));
 
-            match url {
-                Ok(a) => {
-                    cover_cache.insert(hash_key, a.clone());
-                    Some(a)
-                },
-                Err(e) => {
-                    error!("Error fetching cover_art: {}", e);
-                    cover_failure_cache.insert(hash_key);
-                    None
-                },
+            if let Some(url) = youtube_cover_url {
+                cover_cache.insert(hash_key.clone(), url.clone());
+                Some(url)
+            } else {
+                match lb.cover_art(&track, &artist, release_name.as_deref(), 0) {
+                    Ok(url) => {
+                        cover_cache.insert(hash_key.clone(), url.clone());
+                        Some(url)
+                    },
+                    Err(e) => {
+                        error!("Error fetching cover_art: {}", e);
+                        cover_failure_cache.insert(hash_key);
+                        None
+                    },
+                }
             }
         };
 
@@ -80,10 +97,10 @@ fn main() -> Result<(), Box<dyn Error>> {
                 .state(artist.clone())
                 .details(track.clone());
 
-            if let Some(url) = cover_art {
+            if let Some(cover_url) = cover_art {
                 t = t.assets(|ass| {
                     ass
-                        .large_image(url)
+                        .large_image(cover_url)
                         .large_text(format!("{} - {}", &track, &artist))
                 })
             }
@@ -96,3 +113,29 @@ fn main() -> Result<(), Box<dyn Error>> {
         thread::sleep(time::Duration::from_secs(15));
     }
 }
+
+fn extract_youtube_video_id(url: &str) -> Option<&str> {
+    let patterns = [
+        "youtube.com/watch?v=",
+        "youtu.be/",
+        "youtube.com/v/",
+        "youtube.com/embed/",
+    ];
+
+    for pattern in patterns.iter() {
+        if let Some(pos) = url.find(pattern) {
+            let start = pos + pattern.len();
+            let end = url[start..]
+                .find(|c: char| !c.is_alphanumeric() && c != '_' && c != '-')
+                .map(|end_pos| start + end_pos)
+                .unwrap_or(url.len());
+
+            let video_id = &url[start..end];
+            if !video_id.is_empty() {
+                return Some(video_id);
+            }
+        }
+    }
+
+    None
+}