nc_bot_webhooks/README.md

NCdiscordhook

Discord webhook bridge for Nextcloud Talk with image attachment support.

Accepts Discord webhook-style JSON payloads and posts them into Nextcloud Talk rooms, preserving images and embed formatting.

Installation

1. Deploy the app

cd /path/to/nextcloud/apps
cp -r /path/to/ncdiscordhook .
php occ app:enable ncdiscordhook

2. Create the bot user

php occ user:add --password-from-env --display-name="Webhook Bot" talk-bot

3. Generate an app password for the bot

1. Log in as talk-bot (or set a password as admin)
2. Go to Settings → Security → Devices & sessions → Add device
3. Copy the app password

4. Configure the app

Go to Settings → Admin → NCdiscordhook:

1. Bot Configuration — paste the app password from step 3
2. Image Retention — set how long to keep uploaded images (default: 90 days)
3. Room Management — click "Fetch Rooms" to see available Talk rooms, select the ones you want, and generate auth tokens

5. Point your services at the webhook URLs

Each configured room gets two webhook URLs (Discord and Apprise formats):

https://your-server.com/apps/ncdiscordhook/discord-webhook/<room-token>/<auth-token>

Copy the auth token from the app settings for each room.

API

Accepts (Discord webhook format)

{
  "content": "Build #1234 passed",
  "embeds": [
    {
      "title": "Deployment",
      "description": "Successfully deployed to production",
      "color": 3066993,
      "image": { "url": "https://example.com/screenshot.png" },
      "fields": [
        { "name": "Duration", "value": "2m 34s" },
        { "name": "Environment", "value": "Production" }
      ]
    }
  ],
  "username": "CI/CD",
  "avatar_url": "https://example.com/icon.png"
}

Sends to Nextcloud Talk

• Formatted text message (content + embeds + fields)
• Each image from embeds[].image or embeds[].thumbnail uploaded and shared inline
• username shown as the sender display name

Payload mapping

Discord field	Nextcloud action
content	Sent as text message
embeds[].title	Included as bold line
embeds[].description	Included in message body
embeds[].image.url	Downloaded, uploaded to NC, shared inline
embeds[].thumbnail.url	Downloaded, uploaded to NC, shared inline
embeds[].fields	Formatted as name: value lines
username	Sender display name
avatar_url	Ignored (NCTalk doesn't support per-message avatars)

Room routing

Each room gets its own webhook URL with a unique auth token:

/discord-webhook/<room-token>/<auth-token>

• Room token — identifies which Talk room to post to (from occ talk:room:list)
• Auth token — secret key for this webhook endpoint (generated in app settings)

Multiple auth tokens can be created per room — useful if you need to rotate keys or share the webhook across multiple services.

Apprise webhook

For Apprise integrations, each room also gets an Apprise webhook URL:

https://your-server.com/apps/ncdiscordhook/apprise-webhook/<room-token>/notify/<auth-token>

Note: the notify segment is required — Apprise's apprises:// URL scheme inserts it in the path.

Apprise sends a different JSON format. Supported fields:

{
  "title": "Build #1234",
  "body": "Successfully deployed to production",
  "type": "info",
  "attachments": [
    { "url": "https://example.com/screenshot.png" }
  ]
}

The apprise webhook maps title, body, and attachments to the same Talk message format as the Discord endpoint, so images and formatting work the same way.

Image management

• Images are uploaded to the bot user's files at /NCdiscordhook-images/<room-token>/
• Cron job purges images older than the configured retention period (default: 90 days)
• Images are stored in the bot user's storage — they count toward the bot user's quota

Security

• Auth token in the URL is the primary auth mechanism — keep it secret
• Bot password is encrypted at rest using Nextcloud's crypto
• Image download uses Nextcloud's HTTP client with local address blocking
• Rate limiting should be handled at the web server or reverse proxy level

Logging

Responses include a X-Webhook-Status header:

Header value	Meaning
ok	Forwarded successfully
unauthorized	Invalid auth token
bad_request	Invalid JSON payload
no_content	No message content in payload
error	Check server logs for details