feat(url-preview): Optionally download audio/video files for url preview requests

src/service/media/data.rs

@@ -207,6 +207,28 @@ impl Data {
 		value.extend_from_slice(&data.image_width.unwrap_or(0).to_be_bytes());
 		value.push(0xFF);
 		value.extend_from_slice(&data.image_height.unwrap_or(0).to_be_bytes());
+		value.push(0xFF);
+		value.extend_from_slice(
+			data.video
+				.as_ref()
+				.map(String::as_bytes)
+				.unwrap_or_default(),
+		);
+		value.push(0xFF);
+		value.extend_from_slice(&data.video_size.unwrap_or(0).to_be_bytes());
+		value.push(0xFF);
+		value.extend_from_slice(&data.video_width.unwrap_or(0).to_be_bytes());
+		value.push(0xFF);
+		value.extend_from_slice(&data.video_height.unwrap_or(0).to_be_bytes());
+		value.push(0xFF);
+		value.extend_from_slice(
+			data.audio
+				.as_ref()
+				.map(String::as_bytes)
+				.unwrap_or_default(),
+		);
+		value.push(0xFF);
+		value.extend_from_slice(&data.audio_size.unwrap_or(0).to_be_bytes());
 
 		self.url_previews.insert(url.as_bytes(), &value);
 
@@ -267,6 +289,48 @@ impl Data {
 			| Some(0) => None,
 			| x => x,
 		};
+		let video = match values
+			.next()
+			.and_then(|b| String::from_utf8(b.to_vec()).ok())
+		{
+			| Some(s) if s.is_empty() => None,
+			| x => x,
+		};
+		let video_size = match values
+			.next()
+			.map(|b| usize::from_be_bytes(b.try_into().unwrap_or_default()))
+		{
+			| Some(0) => None,
+			| x => x,
+		};
+		let video_width = match values
+			.next()
+			.map(|b| u32::from_be_bytes(b.try_into().unwrap_or_default()))
+		{
+			| Some(0) => None,
+			| x => x,
+		};
+		let video_height = match values
+			.next()
+			.map(|b| u32::from_be_bytes(b.try_into().unwrap_or_default()))
+		{
+			| Some(0) => None,
+			| x => x,
+		};
+		let audio = match values
+			.next()
+			.and_then(|b| String::from_utf8(b.to_vec()).ok())
+		{
+			| Some(s) if s.is_empty() => None,
+			| x => x,
+		};
+		let audio_size = match values
+			.next()
+			.map(|b| usize::from_be_bytes(b.try_into().unwrap_or_default()))
+		{
+			| Some(0) => None,
+			| x => x,
+		};
 
 		Ok(UrlPreviewData {
 			title,
@@ -275,6 +339,12 @@ impl Data {
 			image_size,
 			image_width,
 			image_height,
+			video,
+			video_size,
+			video_width,
+			video_height,
+			audio,
+			audio_size,
 		})
 	}
 }