feat: browse channel playlists

tests/unit/youtube.rs

@@ -787,6 +787,120 @@ fn search_sanitizes_display_metadata_and_rejects_invalid_envelopes() {
     }
 }
 
+#[test]
+fn channel_playlist_listing_uses_flat_ids_sanitizes_and_deduplicates() {
+    // yt-dlp's /playlists tab returns URL rows, not nested playlist contents.
+    let playlists = channel_playlists(
+        r#"{"_type":"playlist","entries":[
+            {"_type":"url","ie_key":"YoutubeTab","id":"PLJ5MFiMfElFA","title":"Rust\u001b"},
+            null,42,{},{"id":"PLJ5MFiMfElFA","title":"Duplicate"},
+            {"id":"PLabcdefghij&list=other","title":"Unsafe"},
+            {"id":"rQ_J9WH6CGk","title":"Video"},
+            {"id":"PLabcdefghij","title":null},
+            {"id":"PLabcdefghij","title":"\u001b\n"},
+            {"id":"OLAK5uy_abcdefghij","title":"Release"}
+        ]}"#,
+    )
+    .unwrap();
+    assert_eq!(
+        playlists
+            .iter()
+            .map(|playlist| (playlist.id.as_str(), playlist.title.as_str()))
+            .collect::<Vec<_>>(),
+        [("PLJ5MFiMfElFA", "Rust"), ("OLAK5uy_abcdefghij", "Release")]
+    );
+    assert!(channel_playlists(r#"{"entries":[]}"#).unwrap().is_empty());
+    for output in ["not JSON", "{}", r#"{"entries":null}"#, r#"{"entries":{}}"#] {
+        assert!(channel_playlists(output).is_err());
+        assert!(playlist_results(output).is_err());
+    }
+}
+
+#[test]
+fn playlist_ids_are_safe_and_support_music_and_legacy_families() {
+    for id in [
+        "PLJ5MFiMfElFA",
+        "OLAK5uy_abcdefghij-_",
+        "UUabcdefghij",
+        "RDabcdefghij",
+        "RDMM",
+        "WL",
+        "LL",
+        "LM",
+    ] {
+        assert!(valid_playlist_id(id), "{id}");
+        assert!(matches!(
+            Job::playlist(id, 0),
+            Err(error) if error.kind() == io::ErrorKind::InvalidInput
+        ));
+    }
+    for id in [
+        "",
+        "--bad",
+        "PLshort",
+        "PLabcdefghij&x=1",
+        "PLabcdefghij#x",
+        "PLabcdefghij/",
+    ] {
+        assert!(!valid_playlist_id(id), "{id}");
+        assert!(matches!(
+            Job::playlist(id, 1),
+            Err(error) if error.kind() == io::ErrorKind::InvalidInput
+        ));
+    }
+    assert!(Job::channel_playlists("https://example.com/@channel").is_err());
+}
+
+#[test]
+fn playlists_preserve_order_repeats_and_creator_identity_with_raw_pagination() {
+    let mut entries = vec![serde_json::Value::Null; PAGE_SIZE];
+    entries[0] = serde_json::json!({
+        "id":"l-GaaivVJCE","title":"First\u{1b}","timestamp":100
+    });
+    entries[1] = serde_json::json!({
+        "id":"SLV9AJxnb1U","title":"Second","timestamp":300,
+        "channel":"Another creator","channel_id":"UC4QobU6STFB0P71PMvOGN5A"
+    });
+    entries[2] = serde_json::json!({"id":"bad","title":"Invalid"});
+    entries[3] = serde_json::json!({"id":"jNQXAC9IVRw","title":null});
+    entries[4] = serde_json::json!({
+        "id":"jNQXAC9IVRw","title":"Members only","availability":"subscriber_only"
+    });
+    entries[5] = entries[0].clone();
+    entries[6] = serde_json::json!({
+        "id":"rQ_J9WH6CGk","title":"Owner upload","channel_id":"UCaYhcUwRBNscFNUKTjgPFiA"
+    });
+    let output = serde_json::json!({
+        "channel_id":"UCaYhcUwRBNscFNUKTjgPFiA","uploader_id":"@RustVideos",
+        "channel":"Rust\u{1b}","entries":entries
+    });
+    let page = playlist_results(&output.to_string()).unwrap();
+    assert!(page.has_more);
+    assert!(page.feed_progress.is_empty());
+    assert_eq!(
+        page.videos
+            .iter()
+            .map(|video| video.id.as_str())
+            .collect::<Vec<_>>(),
+        ["l-GaaivVJCE", "SLV9AJxnb1U", "l-GaaivVJCE", "rQ_J9WH6CGk"]
+    );
+    assert_eq!(page.videos[0].title, "First");
+    assert_eq!(page.videos[0].channel, None);
+    assert_eq!(page.videos[0].channel_id, None);
+    assert_eq!(page.videos[0].uploader_id, None);
+    assert_eq!(page.videos[3].channel.as_deref(), Some("Rust"));
+    assert_eq!(page.videos[3].uploader_id.as_deref(), Some("@RustVideos"));
+    assert_eq!(page.videos[1].channel.as_deref(), Some("Another creator"));
+    assert_eq!(
+        page.videos[1].channel_id.as_deref(),
+        Some("UC4QobU6STFB0P71PMvOGN5A")
+    );
+    assert_eq!(page.videos[1].uploader_id, None);
+    assert!(!playlist_results(r#"{"entries":[]}"#).unwrap().has_more);
+    assert!(playlist_results(r#"{"channel_id":"invalid","entries":[]}"#).is_err());
+    assert!(playlist_results(r#"{"uploader_id":"@bad\u001b","entries":[]}"#).is_err());
+}
+
 #[test]
 fn feeds_merge_newest_first_deduplicate_and_inherit_channel_identity() {
     let output = r#"{"channel_id":"UCaYhcUwRBNscFNUKTjgPFiA","uploader_id":"@RustVideos","channel":"Rust\u001b","entries":[null,{"id":"l-GaaivVJCE","title":"Older","timestamp":100},{"id":"jNQXAC9IVRw","title":"Unknown","timestamp":null}]}