Turn a channel name into an id before touching a message

conversations.history and chat.delete only take ids, so a stored name like
logbuch answered channel_not_found. The name is resolved through
conversations.list first, and the hint asks for the id.

messages/de.json

@@ -757,7 +757,7 @@
 				"includeInternal": "Slack ist intern, deshalb standardmäßig an. Aus heißt nur Kunden- und öffentliche Beiträge.",
 				"sendNow": "Schickt den Stand der letzten sieben Tage sofort in den Kanal.",
 				"botToken": "Aus der Slack-App unter OAuth & Permissions, beginnt mit xoxb. Mit Bot-Token lassen sich Nachrichten später wieder löschen.",
-				"channel": "Name oder Kennung des Kanals, etwa logbuch oder C01234567."
+				"channel": "Am besten die Kanal-ID, etwa C01234567. In Slack: Kanal öffnen, auf den Namen klicken, unten steht die Kanal-ID. Ein Name wie logbuch geht auch, dafür braucht der Bot zusätzlich channels:read."
 			},
 			"errors": {
 				"webhookInvalid": "Das sieht nicht nach einer Slack-Webhook-Adresse aus.",

messages/en.json

@@ -757,7 +757,7 @@
 				"includeInternal": "Slack is internal, so this is on by default. Off means customer and public entries only.",
 				"sendNow": "Sends the last seven days into the channel right away.",
 				"botToken": "From the Slack app under OAuth & Permissions, starts with xoxb. A bot token lets messages be deleted later.",
-				"channel": "Channel name or id, for example logbuch or C01234567."
+				"channel": "Prefer the channel id, for example C01234567. In Slack open the channel, click its name, the id sits at the bottom. A name like logbuch works too, but then the bot also needs channels:read."
 			},
 			"errors": {
 				"webhookInvalid": "That does not look like a Slack webhook address.",

src/lib/admin-settings.ts

@@ -8,7 +8,7 @@ import {
 } from '~/data/repositories/settings'
 import { invalid, isUuid, readField, readFlag, type AdminFormState } from './admin-forms'
 import { runWeeklyReport } from './report-settings'
-import { deleteFromSlack, findMessageTs } from './slack'
+import { deleteFromSlack, findMessageTs, resolveChannelId } from './slack'
 import { reportText } from './weekly-report'
 import type { Viewer } from './auth-access'
 
@@ -132,12 +132,18 @@ export async function performDeleteMessage(viewer: Viewer, formData: FormData):
 		return invalid('runNoChannel')
 	}
 
+	const resolved = await resolveChannelId(token, channel)
+
+	if (!resolved.ok) {
+		return invalid('slackSaid', { detail: resolved.detail })
+	}
+
 	let messageTs = run.messageTs
 
 	if (!messageTs) {
 		const lookup = await findMessageTs({
 			token,
-			channel,
+			channel: resolved.id,
 			text: reportText({ from: run.fromAt, to: run.toAt, total: run.total }),
 			around: run.createdAt,
 		})
@@ -149,7 +155,7 @@ export async function performDeleteMessage(viewer: Viewer, formData: FormData):
 		messageTs = lookup.messageTs
 	}
 
-	const result = await deleteFromSlack(token, channel, messageTs)
+	const result = await deleteFromSlack(token, resolved.id, messageTs)
 
 	if (!result.ok) {
 		return invalid('slackSaid', { detail: result.detail })
@@ -163,7 +169,7 @@ export async function performDeleteMessage(viewer: Viewer, formData: FormData):
 		action: 'settings.reportDelete',
 		entity: 'setting',
 		entityId: run.id,
-		data: { channel, messageTs },
+		data: { channel: resolved.id, messageTs },
 	})
 
 	return { status: 'ok', message: 'messageDeleted' }

src/lib/slack.ts

@@ -121,3 +121,52 @@ export async function findMessageTs(args: {
 
 	return { ok: false, detail: `no_match_in_${messages.length}_messages` }
 }
+
+export type ChannelResult =
+	| { ok: true, id: string }
+	| { ok: false, detail: string }
+
+const channelIdPattern = /^[CGD][A-Z0-9]{6,}$/u
+
+export function looksLikeChannelId(value: string): boolean {
+	return channelIdPattern.test(value)
+}
+
+export async function resolveChannelId(token: string, channel: string): Promise<ChannelResult> {
+	const wanted = channel.trim().replace(/^#/u, '')
+
+	if (looksLikeChannelId(wanted)) {
+		return { ok: true, id: wanted }
+	}
+
+	let cursor: string | undefined
+
+	for (let page = 0; page < 5; page += 1) {
+		const { ok, data } = await callApi(token, 'conversations.list', {
+			types: 'public_channel,private_channel',
+			exclude_archived: true,
+			limit: 200,
+			...(cursor ? { cursor } : {}),
+		})
+
+		if (!ok) {
+			return { ok: false, detail: String(data.error ?? 'unknown_error') }
+		}
+
+		const channels = Array.isArray(data.channels) ? data.channels as { id?: string, name?: string }[] : []
+		const found = channels.find(entry => entry.name === wanted)
+
+		if (found?.id) {
+			return { ok: true, id: found.id }
+		}
+
+		const meta = data.response_metadata as { next_cursor?: string } | undefined
+		cursor = meta?.next_cursor
+
+		if (!cursor) {
+			break
+		}
+	}
+
+	return { ok: false, detail: `channel_name_not_found:${wanted}` }
+}