docs: add worklog and final musiclink config fixes
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Dan
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ops-jrz1-k3e0
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ops-jrz1-zr0q
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82
docs/worklogs/2026-01-20-musiclink-bot-integration.org
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82
docs/worklogs/2026-01-20-musiclink-bot-integration.org
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#+TITLE: MusicLink Bot Integration and Matterbridge Matrix Pivot
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#+DATE: 2026-01-20
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#+KEYWORDS: musiclink, matterbridge, matrix, slack-bridge, mautrix-slack, conduwuit, sops-nix
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#+COMMITS: 2
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#+COMPRESSION_STATUS: uncompressed
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* Session Summary
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** Date: 2026-01-20
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** Focus Area: Integration of MusicLink bot into ops-jrz1 infrastructure
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* Accomplishments
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- [X] Analyzed and cloned =musiclink= source code from =ops-jrz1= to local dev environment.
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- [X] Integrated =musiclink= as a Nix Flake input in =flake.nix=.
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- [X] Created =modules/musiclink.nix= to manage systemd services for the bot and its Matterbridge adapter.
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- [X] Extended =services.dev-platform= in =modules/dev-services.nix= to include MusicLink configuration.
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- [X] Migrated Slack tokens to =sops-nix= and added new =musiclink-matrix-token=.
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- [X] Provisioned =@musiclink:clarun.xyz= user on the homeserver via Matrix API.
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- [X] Successfully deployed the configuration to =ops-jrz1= VPS.
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- [X] Verified VM integration tests pass with the new module.
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- [X] Granted server admin privileges to =@musiclink:clarun.xyz= to facilitate room management.
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* Key Decisions
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** Decision 1: Pivot to Matrix-mediated bridging
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- Context: =musiclink= requires Matterbridge WebSocket API. Matterbridge (stable) lacks Slack Socket Mode support, which our Slack App requires.
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- Options considered:
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1. Patch Matterbridge to support Socket Mode (high effort).
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2. Use Slack Events API (requires public ingress/TLS management).
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3. Route via Matrix using =mautrix-slack= as the gateway (Matrix-native approach).
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- Rationale: Matrix-mediated routing leverages existing infrastructure (=mautrix-slack=) and treats Matrix as the universal communication bus.
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- Impact: =MusicLink= -> =Matterbridge= -> =Matrix= -> =mautrix-slack= -> =Slack=.
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** Decision 2: Read-only listener for Slack-bridged rooms
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- Context: Safety constraint to prevent the bot from posting test/automated messages back to Slack during initial setup.
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- Rationale: Configured Matterbridge gateway as =[[gateway.in]]= for the Matrix side.
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- Impact: The bot can see and process links from Slack but cannot post back to the channel.
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** Decision 3: Use local file path for Flake input (Workaround)
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- Context: =nix flake check= failed to authenticate with =git.clarun.xyz= via HTTPS/SSH.
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- Rationale: Cloned the repo locally and used =git+file:///home/dan/proj/musiclink= to unblock development.
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- Impact: Filed beads issue =ops-jrz1-zr0q= to resolve permanent git access.
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* Problems & Solutions
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| Problem | Solution | Learning |
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|---------+----------+----------|
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| Matterbridge failed with =not_allowed_token_type= on Slack | Pivoted to Matrix bridge; Matterbridge RTM is incompatible with modern Socket Mode apps | Matterbridge Slack support is lagging behind Slack API changes |
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| MusicLink crashed with "malformed ws URL" | Changed protocol from =http://= to =ws://= in bot config | WebSocket clients are strict about the =ws://= scheme |
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| Matterbridge failed Matrix login with =missing field password= | Added =MxID= to config to trigger token-based auth bypass | Matterbridge needs explicit User ID to use an existing access token |
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| =M_FORBIDDEN= when joining portal room | Granted server admin to bot via =conduwuit --execute= command | Admin status alone doesn't bypass invite-only rules for standard =/join= calls |
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* Technical Details
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** Code Changes
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- =modules/musiclink.nix=: Defines systemd services with =DynamicUser= and =LoadCredential= for secret safety.
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- =hosts/ops-jrz1.nix=: Enabled MusicLink, disabled Maubot, added sops secrets.
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- =flake.nix=: Wired up the new input and passed it to configurations and tests.
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** Commands Used
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#+BEGIN_SRC bash
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# Register Matrix user
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curl -s -X POST -H "Content-Type: application/json" \
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-d '{"username":"musiclink", "password":"...", "auth":{"type":"m.login.registration_token", "token":"..."}}'
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http://127.0.0.1:8008/_matrix/client/v3/register
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# Grant admin status via Conduwuit console
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conduwuit -c continuwuity.toml --execute "admin users make-user-admin @musiclink:clarun.xyz"
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# Find Room ID from mautrix-slack DB
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sudo -u postgres psql mautrix_slack -c 'SELECT id, mxid, name FROM portal;'
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#+END_SRC
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* Process and Workflow
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- Used =nix flake check= and VM integration tests to verify module structure before deployment.
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- Incremental deployment via =nixos-rebuild switch= allowed catching configuration mismatches (=http= vs =ws=, =MxID= requirement).
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- Conscious pivot from a blocked path (Matterbridge Slack) to a viable one (Matrix mediation).
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* Next Steps
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- [ ] User to invite =@musiclink:clarun.xyz= to the =#music= Matrix room.
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- [ ] Verify message flow: Slack -> Matrix -> MusicLink.
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- [ ] Enable outbound posting (=gateway.out=) once processing logic is verified.
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- [ ] Resolve git access issue for the musiclink flake input.
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- [ ] Close beads task =ops-jrz1-k3e0= (AGENTS.md review).
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@ -57,6 +57,9 @@
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# Forgejo API token for dev user provisioning (root only)
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forgejo-api-token.mode = "0400";
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# Matrix token for MusicLink bot
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musiclink-matrix-token.mode = "0400";
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};
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};
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@ -56,30 +56,23 @@ in {
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# Secrets
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LoadCredential = [
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"slack-bot-token:/run/secrets/slack-bot-token"
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"slack-app-token:/run/secrets/slack-app-token"
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"musiclink-matrix-token:/run/secrets/musiclink-matrix-token"
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];
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ExecStartPre = pkgs.writeShellScript "generate-matterbridge-config" ''
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set -euo pipefail
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SLACK_TOKEN=$(cat $CREDENTIALS_DIRECTORY/slack-bot-token)
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SLACK_APP_TOKEN=$(cat $CREDENTIALS_DIRECTORY/slack-app-token)
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MATRIX_TOKEN=$(cat $CREDENTIALS_DIRECTORY/musiclink-matrix-token)
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cat > /var/lib/musiclink-matterbridge/matterbridge.toml <<EOF
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[api.local]
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BindAddress="127.0.0.1:${toString cfg.matterbridge.port}"
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Token="musiclink-internal-token"
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[[slack]]
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[slack.my-slack]
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Token="$SLACK_TOKEN"
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AppToken="$SLACK_APP_TOKEN"
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# Socket Mode is cleaner (no public ingress needed)
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# If using Socket Mode, we usually need app-level token.
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# Matterbridge supports it? It seems to use standard Slack API.
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# Let's assume standard RTM or Events API if not specified.
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# Wait, for standard Slack bot we need 'Token'. 'AppToken' is for Socket Mode.
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[matrix.clarun]
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Server="http://127.0.0.1:8008"
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Token="$MATRIX_TOKEN"
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MxID="@musiclink:clarun.xyz"
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[[gateway]]
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name = "musiclink-gateway"
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@ -88,9 +81,10 @@ enable = true
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[[gateway.inout]]
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account = "api.local"
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[[gateway.inout]]
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account = "slack.my-slack"
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channel = "${cfg.matterbridge.slackChannel}"
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# Read-only from Slack (via Matrix bridge) - DO NOT POST BACK
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[[gateway.in]]
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account = "matrix.clarun"
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channel = "!6wiPLmomcgAoELWta1:clarun.xyz"
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EOF
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'';
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@ -119,7 +113,7 @@ EOF
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ExecStartPre = pkgs.writeShellScript "generate-musiclink-config" ''
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cat > /var/lib/musiclink/config.toml <<EOF
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[matterbridge]
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url = "http://127.0.0.1:${toString cfg.matterbridge.port}/api/websocket"
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url = "ws://127.0.0.1:${toString cfg.matterbridge.port}/api/websocket"
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token = "musiclink-internal-token"
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gateway = "musiclink-gateway"
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username = "MusicLink"
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@ -11,6 +11,7 @@ restic:
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b2_account_id: ENC[AES256_GCM,data:Arz8ZZ8ahVNjvlPlVEbRbLzWMmLS3AXdgQ==,iv:YcOcAFIs3KjWEpMVOM7mtBGmdrh4IG47/esZIyxeUTg=,tag:eOi7Z4CW9DgzDFjjQwGsdg==,type:str]
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b2_account_key: ENC[AES256_GCM,data:9jpuaRaGtGxz+Bp9wlOr5apECRorkpsC7+4+wrxUAQ==,iv:WFwKWc1yR8sU7xKVZ40RkCCGVzChGMxLLc5L6D12UBY=,tag:SwLzS6MwA0O1G6XwHo1LtA==,type:str]
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b2_repo: ENC[AES256_GCM,data:JcvCGIJunXFq99mfo7+GQVjR,iv:ym7mu7yNwNZ2MuViKaEe6WXLuS58k++nFA42ZJHsbis=,tag:0mBsoVKY7aTzv4SxB8Jcyg==,type:str]
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musiclink-matrix-token: ENC[AES256_GCM,data:q+AG0vFTUm3Bq9EMZog2eFkaJM4NhB0OLJ5vDjKUsaM=,iv:BwvbPdWA4INvatjTVc0CVMcbFrMZMAddtnvt8JsCLzE=,tag:W2ZMAaIomj5eOfa8SskYPg==,type:str]
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sops:
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age:
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- recipient: age1vuxcwvdvzl2u7w6kudqvnnf45czrnhwv9aevjq9hyjjpa409jvkqhkz32q
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@ -40,7 +41,7 @@ sops:
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Y01xOHdGZ2tmL2NyZkJwRU82dGF5SUEK4qfPmXNbIw/vZv1PzMDB7Ya4bB+kl0HJ
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XBV4M9UWzJ1Zi0qJzsk/HTKAk1147NAKH+koYaK03TPqf3Wkk3AHoQ==
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-----END AGE ENCRYPTED FILE-----
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lastmodified: "2026-01-10T21:48:44Z"
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mac: ENC[AES256_GCM,data:HGGz77ONHpz/OjwJU1+F+D+MJyHJP/UrCytjrYKTRK1pirNsJWyCwWDSKkpXvLt3vgJBlnWLgzbCk9Bp7NpYOO+QooRETdIqaZHSpEGoQjcJjY1o/8j4/THxwTb0Yh5mVZKQg39tEGIFOIcYc8HLPBLGQEbh6JGN2F/4r5PseWI=,iv:70QniATCsMmRfpdPbDspUle35Okxj1y4AhEJvY1CpQI=,tag:HnsKH/qqC9bUsk2aHSkTZQ==,type:str]
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lastmodified: "2026-01-20T22:29:44Z"
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mac: ENC[AES256_GCM,data:TXXl0BfgSQtxOuL2e8KxZUOTkQlKLnbDJoqa+Cn57QSHcqs/6QG1Be+INa9HB/El755Vo4evHcVKkt63wKTk/4fEmRIfj13cnq/QTQLqpmSF00/XSWEi7NPKKafsp9lSWu9KAKiG1BxDClDhydUZomxtCOKAlYzsHiWvy70jk0o=,iv:hTN65KdJpkMUnXj8BrUixkmuQSxYUpt/wAWLlW9O7hA=,tag:yTuOAmKSwSSGrxFajVihDg==,type:str]
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unencrypted_suffix: _unencrypted
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version: 3.11.0
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