fix: handle age restricted channels

refactor! rename ExtractionError::VideoUnavailable to ExtractionError::Unavailable

src/client/response/channel.rs

@@ -36,7 +36,7 @@ pub(crate) struct TabRendererWrap {
 pub(crate) struct TabRenderer {
     #[serde(default)]
     pub content: TabContent,
-    pub endpoint: ChannelTabEndpoint,
+    pub endpoint: Option<ChannelTabEndpoint>,
 }
 
 #[serde_as]
@@ -148,10 +148,16 @@ pub(crate) struct MicroformatDataRenderer {
 
 #[serde_as]
 #[derive(Debug, Deserialize)]
-#[serde(rename_all = "camelCase")]
-pub(crate) struct ChannelAbout {
-    #[serde_as(as = "VecSkipError<_>")]
-    pub on_response_received_endpoints: Vec<ContinuationActionWrap<AboutChannelRendererWrap>>,
+#[serde(untagged)]
+pub(crate) enum ChannelAbout {
+    #[serde(rename_all = "camelCase")]
+    ReceivedEndpoints {
+        #[serde_as(as = "VecSkipError<_>")]
+        on_response_received_endpoints: Vec<ContinuationActionWrap<AboutChannelRendererWrap>>,
+    },
+    Content {
+        contents: Option<Contents>,
+    },
 }
 
 #[derive(Debug, Deserialize)]

src/client/response/video_item.rs

@@ -69,6 +69,14 @@ pub(crate) enum YouTubeListItem {
         contents: MapResult<Vec<YouTubeListItem>>,
     },
 
+    /// Age-restricted channel
+    #[serde(rename_all = "camelCase")]
+    ChannelAgeGateRenderer {
+        channel_title: String,
+        #[serde_as(as = "Text")]
+        main_text: String,
+    },
+
     /// No video list item (e.g. ad) or unimplemented item
     ///
     /// Unimplemented:
@@ -704,7 +712,7 @@ impl YouTubeListMapper<YouTubeItem> {
                 self.warnings.append(&mut contents.warnings);
                 contents.c.into_iter().for_each(|it| self.map_item(it));
             }
-            YouTubeListItem::None => {}
+            YouTubeListItem::None | YouTubeListItem::ChannelAgeGateRenderer { .. } => {}
         }
     }