Initial commit

main.ts

@@ -0,0 +1,97 @@
+const MASTODON_INSTANCE_URL = Deno.env.get('MASTODON_INSTANCE_URL')      // e.g. https://botsin.space
+const MASTODON_ACCESS_TOKEN = Deno.env.get('MASTODON_ACCESS_TOKEN') // you can get this at $INSTANCE_URL/settings/applications
+
+// first we need to find out which files we can post, and which ones we already
+// have posted
+
+console.log('Picking file to post…')
+const alreadyPostedFiles = new Set()
+for await (const dirEntry of Deno.readDir("./posts/.posted")) {
+  if (dirEntry.isSymlink) {
+    alreadyPostedFiles.add(dirEntry.name)
+  }
+}
+
+const availableFiles = []
+for await (const dirEntry of Deno.readDir("./posts/")) {
+  if (dirEntry.name === '.gitignore') continue
+
+  if (dirEntry.isFile && !alreadyPostedFiles.has(dirEntry.name)) {
+    availableFiles.push(dirEntry.name)
+  }
+}
+
+console.log(`Found ${availableFiles.length} files which are not yet posted`)
+
+if (availableFiles.length === 0) {
+  console.log('Nothing left to post at the moment. Bye!')
+  Deno.exit()
+}
+
+const fileToPost = availableFiles[Math.floor(Math.random() * availableFiles.length)]
+const bytes = await Deno.readFile(`./posts/${fileToPost}`)
+
+// we need two requests
+// 1. upload media
+// 2. create status with media id
+
+// see https://docs.joinmastodon.org/methods/media/#v2
+const mediaData = new FormData()
+mediaData.append('file', new Blob([bytes]))
+
+type MediaResponse = {
+  'id': string
+  'type': string
+  'url': string
+  'preview_url': string
+  'remote_url': null,
+  'text_url': string
+  'meta': {
+    'focus': {
+      'x': number
+      'y': number
+    },
+    'original': {
+      'width': number
+      'height': number
+      'size': string
+      'aspect': number
+    },
+    'small': {
+      'width': number
+      'height': number
+      'size': string
+      'aspect': number
+    }
+  },
+  'description': string
+  'blurhash': string
+}
+
+console.log('Sending post request to', `${MASTODON_INSTANCE_URL}/api/v2/media`)
+const mediaRequest = await fetch(`${MASTODON_INSTANCE_URL}/api/v2/media`, {
+  method: 'POST',
+  headers: {
+    Authorization: `Bearer ${MASTODON_ACCESS_TOKEN}`
+  },
+  body: mediaData
+}).then(res => res.json()) as unknown as MediaResponse
+console.log('mediaRequest', mediaRequest)
+
+// see https://docs.joinmastodon.org/methods/statuses/#create
+const statusData = new FormData()
+statusData.append('media_ids[]', mediaRequest.id)
+
+console.log('Sending post request to', `${MASTODON_INSTANCE_URL}/api/v1/statuses`)
+const statusRequest = await fetch(`${MASTODON_INSTANCE_URL}/api/v1/statuses`, {
+  method: 'POST',
+  headers: {
+    Authorization: `Bearer ${MASTODON_ACCESS_TOKEN}`
+  },
+  body: statusData
+}).then(res => res.json())
+console.log('statusRequest', statusRequest)
+
+console.log('Linking posted file so we can skip it in the future…')
+await Deno.symlink(`./posts/${fileToPost}`, `./posts/.posted/${fileToPost}`)
+console.log('Done!')