1 files changed, 77 insertions, 0 deletions
diff --git a/src/handlers/event/pinboard.rs b/src/handlers/event/pinboard.rs
new file mode 100644
index 0000000..0c87a5b
--- /dev/null
+++ b/src/handlers/event/pinboard.rs
@@ -0,0 +1,77 @@
+use crate::settings::Settings;
+use crate::utils;
+
+use log::*;
+use poise::serenity_prelude::model::prelude::*;
+use poise::serenity_prelude::Context;
+
+pub async fn handle(ctx: &Context, pin: &ChannelPinsUpdateEvent, settings: &Settings) {
+	if let Some(sources) = &settings.pinboard_sources {
+		if !sources.contains(&pin.channel_id) {
+			warn!("can't access source of pin!");
+			return;
+		}
+	}
+
+	let mut pinner = guess_pinner(ctx, pin).await;
+	let pins = pin
+		.channel_id
+		.pins(&ctx.http)
+		.await
+		.expect("couldn't get a list of pins!?");
+
+	for pin in pins {
+		// We call `take` because it's supposed to be just for the latest message.
+		redirect(ctx, &pin, pinner.take(), settings.pinboard_target).await;
+		pin.unpin(&ctx).await.expect("couldn't unpin message");
+	}
+}
+
+async fn redirect(ctx: &Context, pin: &Message, pinner: Option<UserId>, target: ChannelId) {
+	let pinner = pinner.map_or("*someone*".to_owned(), |u| format!("<@{u}>"));
+	let embed = utils::resolve_message_to_embed(ctx, pin).await;
+
+	target
+		.send_message(&ctx.http, |m| {
+			m.allowed_mentions(|am| am.empty_parse())
+				.content(format!("📌'd by {pinner} in {}", pin.link()))
+				.set_embed(embed)
+		})
+		.await
+		.expect("couldn't redirect message");
+}
+
+/// (Desperate, best-effort) attempt to get the user that pinned the last message
+///
+/// Now, since Discord is SUPER annoying, it doesn't actually tell you which bloody user
+/// that triggered the pins update event. So, you have to dig into the audit log.
+/// Unfortunately, while you do get a timestamp, the REST API does not return the time at
+/// which each action is logged, which, to me, means that it is not a freaking log *at all*.
+///
+/// I love Discord.
+///
+/// So, the plan is that only the first pinned message gets clear pinner information,
+/// since we can just get the latest pin, which should happen on the exact second.
+/// We can't reliably say the same for any existing pins, so we can only /shrug and say
+/// *somebody* did it. Ugh.
+async fn guess_pinner(ctx: &Context, pin: &ChannelPinsUpdateEvent) -> Option<UserId> {
+	if let Some(g) = pin.guild_id {
+		g.audit_logs(
+			&ctx.http,
+			// This `num` call shouldn't be necessary.
+			// See https://github.com/serenity-rs/serenity/issues/2488
+			Some(Action::Message(MessageAction::Pin).num()),
+			None,    // user id
+			None,    // before
+			Some(1), // limit
+		)
+		.await
+		.ok()
+		.and_then(|mut logs| logs.entries.pop())
+		.map(|first| first.user_id)
+	} else {
+		// TODO: mayyyyybe we can guess who pinned something in a DM...?
+		warn!("couldn't figure out who pinned in {}!", pin.channel_id);
+		None
+	}
+}