server: extract image title and alt attributes into figure captions

server/src/newsreader.rs

@@ -15,7 +15,8 @@ use crate::{
     compute_offset_limit,
     error::ServerError,
     graphql::{Body, Email, Html, Message, NewsPost, Tag, Thread, ThreadSummary},
-    AddOutlink, EscapeHtml, InlineStyle, SanitizeHtml, SlurpContents, StripHtml, Transformer,
+    AddOutlink, EscapeHtml, FrameImages, InlineStyle, SanitizeHtml, SlurpContents, StripHtml,
+    Transformer,
 };
 
 pub fn is_newsreader_search(query: &str) -> bool {
@@ -193,6 +194,7 @@ pub async fn thread(pool: &PgPool, thread_id: String) -> Result<Thread, ServerEr
                 ],
             ],
         }),
+        Box::new(FrameImages),
         Box::new(AddOutlink),
         Box::new(EscapeHtml),
         Box::new(InlineStyle),