assume well-known is None if text length exceeds 10000 chars

Signed-off-by: strawberry <strawberry@puppygock.gay>

src/api/server_server.rs

@@ -595,14 +595,25 @@ async fn request_well_known(destination: &str) -> Option<String> {
         .await;
     debug!("Got well known response");
     debug!("Well known response: {:?}", response);
+
     if let Err(e) = &response {
         debug!("Well known error: {e:?}");
         return None;
     }
+
     let text = response.ok()?.text().await;
+
     debug!("Got well known response text");
     debug!("Well known response text: {:?}", text);
+
+    if text.as_ref().ok()?.len() > 10000 {
+        info!("Well known response for destination '{destination}' exceeded past 10000 characters, assuming no well-known.");
+        return None;
+    }
+
     let body: serde_json::Value = serde_json::from_str(&text.ok()?).ok()?;
+    debug!("serde_json body of well known text: {}", body);
+
     Some(body.get("m.server")?.as_str()?.to_owned())
 }