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feat(tazjin/tgsa): use permanent media links in bbcode

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uses the tgsa-proxied media links in the message bbcode, leading to
stable image serving even if telegram swaps cdn addresses around, as
long as their embed page is någorlunda the same.

Change-Id: I50af1b3512d4e429fae4a2b3d10395664169e7a1
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5611
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
This commit is contained in:
Vincent Ambo 2022-05-15 01:48:26 +02:00 committed by tazjin
parent b308361a73
commit 73c08943b8
1 changed files with 22 additions and 4 deletions
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26
users/tazjin/tgsa/src/main.rs
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@ -147,20 +147,38 @@ fn parse_tgmessage(embed: &str) -> Result<TgMessage> {
}) })
} }
// create a permanent media url that tgsa can redirect if telegram
// changes its upstream links.
//
// assumes that tgsa lives at tgsa.tazj.in (which it does)
fn media_url(link: &TgLink, idx: usize) -> String {
format!(
"https://tgsa.tazj.in/img/{}/{}/{}",
link.username, link.message_id, idx
)
}
fn to_bbcode(link: &TgLink, msg: &TgMessage) -> String { fn to_bbcode(link: &TgLink, msg: &TgMessage) -> String {
let mut out = String::new(); let mut out = String::new();
out.push_str(&format!("[quote=\"{}\"]\n", msg.author)); out.push_str(&format!("[quote=\"{}\"]\n", msg.author));
for video in &msg.videos { for video in 0..msg.videos.len() {
out.push_str(&format!("[url=\"{}\"]", link.to_url())); out.push_str(&format!("[url=\"{}\"]", link.to_url()));
out.push_str(&format!("[img]{}[/img]", video));
// video thumbnail links are appended to the photos, hence the
// addition here
out.push_str(&format!(
"[img]{}[/img]",
media_url(link, video + msg.photos.len())
));
out.push_str("[/url]\n"); out.push_str("[/url]\n");
out.push_str("[sub](Click thumbnail to open video)[/sub]\n") out.push_str("[sub](Click thumbnail to open video)[/sub]\n")
} }
for photo in &msg.photos { for photo in 0..msg.photos.len() {
out.push_str(&format!("[timg]{}[/timg]\n", photo)); out.push_str(&format!("[timg]{}[/timg]\n", media_url(link, photo)));
} }
if msg.has_audio { if msg.has_audio {