refactor(site): introduce Site trait and SITES registry

crates/x-media/src/site/twitter/interface.rs

@@ -1,10 +1,31 @@
 use super::model;
 use crate::media::Media;
-use crate::site::{FetchError, Fetched};
+use crate::site::{FetchError, Fetched, Site, SiteFuture};
 use html_escape::{encode_double_quoted_attribute, encode_text};
 use regex::Regex;
 use std::sync::LazyLock;
 
+/// Registry entry for the twitter adapter (see [`crate::site::Site`]).
+pub struct TwitterSite;
+
+impl Site for TwitterSite {
+    fn id(&self) -> &'static str {
+        "twitter"
+    }
+
+    fn pattern(&self) -> &'static Regex {
+        &PATTERN
+    }
+
+    fn cache_key(&self, url: &str) -> Option<String> {
+        cache_key(url)
+    }
+
+    fn fetch_from_url<'a>(&'a self, url: &'a str) -> SiteFuture<'a, Fetched> {
+        Box::pin(async move { fetch_from_url(url).await })
+    }
+}
+
 pub static PATTERN: LazyLock<Regex> = LazyLock::new(|| {
     Regex::new(r"^(?:https?://)?(?:www\.|mobile\.)?(?:x|twitter|fixvx|vxtwitter|fixupx|fxtwitter)\.com/[^.]+/status/(\d+)").unwrap()
 });

crates/x-media/src/site/twitter/mod.rs

@@ -3,5 +3,5 @@ mod interface;
 mod model;
 
 pub use interface::{
-    PATTERN, Tweet, cache_key, enabled, fetch_from_url, is_retryable, media_headers,
+    PATTERN, Tweet, TwitterSite, cache_key, enabled, fetch_from_url, is_retryable, media_headers,
 };