Send through a bot token so messages can be deleted again

Incoming webhooks return no message id, so nothing can be removed later.
Settings now take a bot token plus channel, chat.postMessage records channel
and timestamp on the run, and the history carries a delete button per
message. The webhook stays as a fallback and is marked as not deletable.

tests/lib/report-settings.test.ts

@@ -3,6 +3,8 @@ import { db } from '~/data/db'
 import { appSettings } from '~/data/schema'
 import { listReportRuns, writeSetting } from '~/data/repositories/settings'
 import { readSlackConfig, reportScope, runWeeklyReport } from '~/lib/report-settings'
+import { makeBrand, makeProject } from '../support/admin'
+import { makePost } from '../support/entries'
 
 const origin = 'https://logbuch.nyo.de'
 
@@ -19,7 +21,8 @@ describe('readSlackConfig', () => {
 
 		const config = await readSlackConfig()
 
-		expect(config.webhook).toContain('verwaltung')
+		expect(config.target).toMatchObject({ kind: 'webhook' })
+		expect(config.target && 'url' in config.target ? config.target.url : '').toContain('verwaltung')
 		expect(config.fromEnv).toBe(false)
 	})
 
@@ -55,3 +58,66 @@ describe('runWeeklyReport', () => {
 		expect(runs[0]).toMatchObject({ sent: false, total: 0, trigger: 'test', detail: 'nothing_published' })
 	})
 })
+
+describe('Bot-Token', () => {
+	it('nimmt Bot-Token und Kanal vor dem Webhook', async () => {
+		await writeSetting('slack.webhook', 'https://hooks.slack.com/services/a/b/c')
+		await writeSetting('slack.botToken', 'xoxb-1234')
+		await writeSetting('slack.channel', 'logbuch')
+
+		const config = await readSlackConfig()
+
+		expect(config.target).toEqual({ kind: 'bot', token: 'xoxb-1234', channel: 'logbuch' })
+		expect(config.hasBot).toBe(true)
+	})
+
+	it('braucht zum Bot-Token einen Kanal', async () => {
+		await writeSetting('slack.botToken', 'xoxb-1234')
+
+		const config = await readSlackConfig()
+
+		expect(config.target).toBeUndefined()
+		expect(config.hasBot).toBe(true)
+	})
+
+	it('merkt sich Kanal und Nachrichtenkennung eines Versands', async () => {
+		const brand = await makeBrand()
+		const project = await makeProject(brand.id)
+		const post = await makePost(project.id, { number: 1, slug: 'eins', status: 'published', publishAt: new Date() })
+
+		expect(post.id).toBeDefined()
+
+		await writeSetting('slack.botToken', 'xoxb-1234')
+		await writeSetting('slack.channel', 'logbuch')
+
+		vi.stubGlobal('fetch', vi.fn(async () => new Response(
+			JSON.stringify({ ok: true, channel: 'C999', ts: '1785600000.000100' }),
+			{ headers: { 'content-type': 'application/json' } },
+		)))
+
+		const outcome = await runWeeklyReport({ origin, trigger: 'test' })
+
+		expect(outcome.reason).toBe('sent')
+		expect(outcome.run).toMatchObject({ sent: true, channel: 'C999', messageTs: '1785600000.000100' })
+	})
+
+	it('vermerkt eine Ablehnung mit dem Grund von Slack', async () => {
+		const brand = await makeBrand()
+		const project = await makeProject(brand.id)
+
+		await makePost(project.id, { number: 1, slug: 'eins', status: 'published', publishAt: new Date() })
+
+		await writeSetting('slack.botToken', 'xoxb-1234')
+		await writeSetting('slack.channel', 'logbuch')
+
+		vi.stubGlobal('fetch', vi.fn(async () => new Response(
+			JSON.stringify({ ok: false, error: 'channel_not_found' }),
+			{ headers: { 'content-type': 'application/json' } },
+		)))
+
+		const outcome = await runWeeklyReport({ origin, trigger: 'test' })
+
+		expect(outcome.reason).toBe('rejected')
+		expect(outcome.run).toMatchObject({ sent: false, detail: 'channel_not_found' })
+	})
+})