fix(link-preview): resolve YouTube videos through oEmbed

desktop/src-tauri/Cargo.toml

@@ -98,6 +98,7 @@ nostr = { version = "0.44", features = ["nip44", "nip49"] }
 # transitive dependency; pinned here for direct use).
 getrandom = "0.2"
 zeroize = "1"
+percent-encoding = "2"
 reqwest = { version = "0.13", features = ["json", "query", "stream", "blocking"] }
 rustls = { version = "0.23", default-features = false, features = ["aws_lc_rs", "std"] }
 url = "2"

desktop/src-tauri/src/commands/link_preview.rs

@@ -1,9 +1,8 @@
 use std::{io::Cursor, net::IpAddr, time::Duration};
 
 use base64::{engine::general_purpose::STANDARD as BASE64_STANDARD, Engine as _};
-use image::ImageDecoder;
-
 use futures_util::StreamExt;
+use image::ImageDecoder;
 use reqwest::{
     header::{ACCEPT, CONTENT_TYPE, LOCATION, USER_AGENT},
     redirect::Policy,
@@ -13,6 +12,8 @@ use url::Url;
 
 #[path = "link_preview_rate_limit.rs"]
 mod rate_limit;
+#[path = "link_preview_youtube.rs"]
+mod youtube;
 
 use rate_limit::{image_host_cooldown_remaining, retry_after_duration, set_image_host_cooldown};
 
@@ -67,6 +68,10 @@ async fn fetch_link_preview_metadata_inner(
     let mut url = Url::parse(href.trim()).map_err(|error| format!("invalid URL: {error}"))?;
     validate_public_https_url(&url).await?;
 
+    if youtube::is_video_url(&url) {
+        return youtube::fetch_oembed_metadata(&url).await;
+    }
+
     for redirect_count in 0..=MAX_REDIRECTS {
         let response = send_pinned_request(&url, "text/html,application/xhtml+xml;q=0.9").await?;