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fix(site): truncate captions to Telegram's 1024-char limit

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A long tweet text or a pixiv artwork with many tags can exceed Telegram's
1024-char caption cap for HTML parse mode, turning an otherwise fine send
into a permanent 400. truncate_caption() cuts at a char boundary (never
splitting a multi-byte rune or an HTML entity like &) and appends an
ellipsis. Applied in caption_with / caption_from_fields, the link-cache
re-send path and the inline-query captions.
This commit is contained in:
YoursFunny
2026-08-13 22:15:33 +08:00
parent 4580b79d4f
commit 2297fdc91c
2 changed files with 80 additions and 11 deletions
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crates/xmedia-bot/src/handlers.rs
+5 -2
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@@ -608,7 +608,7 @@ async fn url_media(bot: Bot, message: &Message, url: &str) {
.cloned()
.unwrap_or_default();
let caption = if format.is_empty() {
cached.caption.clone()
x_media::site::truncate_caption(&cached.caption)
} else {
x_media::site::caption_from_fields(
&format,
@@ -859,6 +859,9 @@ async fn answer_inline_query(bot: Bot, query: InlineQuery) -> Result<bool, Reque
match x_media::site::fetch(&query.query).await {
Ok(Some(fetched)) => {
let mut results: Vec<InlineQueryResult> = Vec::new();
// Inline results have the same 1024-char caption limit as regular
// messages; truncate once here for all items.
let caption = x_media::site::truncate_caption(&fetched.caption);
for (i, media) in fetched.media.iter().enumerate() {
let id = format!("{i}");
let Some(url) = url::Url::parse(media.url()).ok() else {
@@ -868,7 +871,7 @@ async fn answer_inline_query(bot: Bot, query: InlineQuery) -> Result<bool, Reque
.thumbnail_url()
.and_then(|t| url::Url::parse(t).ok())
.unwrap_or_else(|| url.clone());
let caption = fetched.caption.clone();
let caption = caption.clone();
let result = match media {
Media::Illustration { .. } => {
// Inline photo results have their own (smaller) size