stack/docs/guides/slice-1-identities.md

Slice 1 identities: Gitea bots, Vikunja bots and their tokens

Jason runs this guide once per business, by hand (PRD REQ-CRED-1, round 3, 1A and 2A). It creates every service identity slice 1 uses and writes each token to a 0600 file the broker reads. Nothing in v1 mints these tokens for you. Brief: docs/plans/2026-10-04_slice-1.md, row SR.

Plan on about 20 minutes with an existing Vikunja, and 30 if you start the bundled one.

Rules for the whole guide

• A token never appears on a command line, in a URL, in shell history, in a chat or in the repository. The commands below read secrets from files or a password prompt, and write tokens straight to files.
• Run every step in one shell with umask 077 set, so every file you create is 0600 and every directory 0700.
• To check a token file, use stat, never cat.
• The Vikunja owner password and the Gitea admin login are the high-value secrets. They are used only in this guide, and never reach the broker or an agent.

0. Set up the shell

umask 077
BIZ=mosaic-stack
S="$HOME/.config/mosaic-dev/secrets/$BIZ"   # token directory, outside the repo
mkdir -p "$S" && chmod 700 "$S"
VK=https://vikunja.example                   # your Vikunja base URL, no trailing slash
GITEA=https://git.example                    # your Gitea base URL
EXP=$(date -u -d '+90 days' +%Y-%m-%dT00:00:00Z)   # Vikunja token expiry

Write EXP down. It goes in the business file as each Vikunja token's expires.

1. Gitea: four bot users and their tokens

Gitea tokens don't expire, and the HTTP route for creating one needs a password, so this part uses the web UI.

1. As a site admin, create the users pm-bot, cto-bot, coder-bot and reviewer-bot (Site Administration, User Accounts, Create). Give each a long random password, which you won't need again after step 3. None of them is an admin.

2. In mosaicstack/stack, add each bot as a collaborator:

   Bot	Repository access
   pm-bot	Write (labels, assignees and closing need it)
   cto-bot	Write
   coder-bot	Write
   reviewer-bot	Read

   No bot is on a protected branch's push or merge allowlist. Pushing to a protected branch is a gated action, and it stays Jason's.

3. Log in as each bot, go to Settings, Applications, and generate one token named mosaic-stack-<role>-<date> with these scopes:

   Bot	Scopes
   pm-bot	write:issue, read:repository, read:user
   cto-bot	write:issue, write:repository, read:user
   coder-bot	write:issue, write:repository, read:user
   reviewer-bot	write:issue, write:repository, read:user

   Leave every other scope unset, and set none to "public only". Reviewer-bot's write:repository is there because Gitea files pull request reviews under the repository scope. Its Read collaborator access is what stops it pushing. Row SR's review checks that before anyone relies on it.

4. Copy each token into its file with an editor, never echo: $S/pm-gitea.token, $S/cto-gitea.token, $S/coder-gitea.token, $S/reviewer-gitea.token. One line, the token only.

5. Log out of each bot account. Record today's date as each Gitea token's rotateBy base. Section 5 has the rotation schedule.

2. Vikunja: the instance and the owner account

You need Vikunja 2.7.0 or later, with local login on and an owner account that is yours.

Path A, an existing instance

Check that curl -s "$VK/api/v1/info" reports v2.7.0 or later. Use your existing account as the owner.

Path B, the bundled instance

Row S3 ships packages/tasks/deploy/vikunja/ for this. Until it lands, these commands start the same pinned image the probes used, bound to 127.0.0.1:

VD="$HOME/.local/share/mosaic-dev/vikunja"; mkdir -p "$VD/db" "$VD/files"
printf 'VIKUNJA_SERVICE_SECRET=%s\n' "$(openssl rand -hex 32)" > "$VD/env"
cat >> "$VD/env" <<EOF
VIKUNJA_SERVICE_PUBLICURL=http://127.0.0.1:3456/
VIKUNJA_DATABASE_TYPE=sqlite
VIKUNJA_DATABASE_PATH=/db/vikunja.db
VIKUNJA_WEBHOOKS_ENABLED=false
VIKUNJA_SERVICE_ENABLEREGISTRATION=false
EOF
docker run -d --name mosaic-vikunja --restart unless-stopped --user "$(id -u):$(id -g)" \
  -p 127.0.0.1:3456:3456 -v "$VD/db:/db" -v "$VD/files:/app/vikunja/files" \
  --env-file "$VD/env" \
  vikunja/vikunja@sha256:e2204a1c1c6a81e833c2b3a5442be182ca2335b54c2e7e37578cc3fe12a27cfc
docker exec -it mosaic-vikunja /app/vikunja/vikunja user create -u jason -e [email protected]
VK=http://127.0.0.1:3456

user create asks for the password when you leave out -p. If your build doesn't prompt, stop and set it some other way. Don't put the password on the command line.

Owner login for this guide

This writes the owner's session header to a file. The password comes from a prompt, and the token never reaches the terminal.

python3 - "$VK" jason "$S/vikunja-owner.hdr" <<'PY'
import getpass, json, sys, urllib.request
base, user, out = sys.argv[1:4]
pw = getpass.getpass("Vikunja owner password: ")
req = urllib.request.Request(base + "/api/v2/login",
    data=json.dumps({"username": user, "password": pw}).encode(),
    headers={"Content-Type": "application/json"})
body = json.load(urllib.request.urlopen(req))
if "token" not in body:
    sys.exit("login answered without a token field; stop and report the keys: %s" % sorted(body))
open(out, "w").write("Authorization: Bearer " + body["token"] + "\n")
print("owner header written")
PY

The probes logged in at /api/v2/login. The token field name is assumed from v1, so the script stops if it's missing. Section 4 deletes the header file.

3. Vikunja: the project, the board and the bots

The project and its board

In the web UI, as the owner:

1. Create the project mosaic-stack, and note its id (in the URL).
2. Open its Kanban view and rename the buckets: To-Do becomes todo, Doing becomes in-progress, Done becomes done. Add in-review and blocked. Each title appears once.
3. In the view's settings, check that the done bucket is done and the default bucket is todo. Leave bucket configuration on manual.
4. Create the labels the business file template lists, and note each id. The business file names labels by id until row S3 settles which labels a bot can see.

P=<project id>

The five bots

api() { curl -sf -H @"$S/vikunja-owner.hdr" -H 'Content-Type: application/json' "$@"; }
for r in pm cto coder reviewer sync; do
  api -X POST "$VK/api/v2/user/bots" \
    -d "{\"username\":\"bot-$BIZ-$r\",\"name\":\"$BIZ $r\"}" | jq -c '{id, username}'
done

Note the five ids. Bot usernames must start with bot-, and this guide uses bot-<business>-<role> so two businesses on one instance don't collide.

Shares

The role bots get write (1). The sync bot gets read (0), so a bug in the poll path can't write.

for r in pm cto coder reviewer; do
  api -X POST "$VK/api/v2/projects/$P/users" -d "{\"username\":\"bot-$BIZ-$r\",\"permission\":1}" | jq -c '{username, permission}'
done
api -X POST "$VK/api/v2/projects/$P/users" -d "{\"username\":\"bot-$BIZ-sync\",\"permission\":0}" | jq -c '{username, permission}'

Scopes

From addendum B section 2 (lead decision 52). Every group or verb not listed stays off.

cat > "$S/scopes-sync.json" <<'EOF'
{"projects":["read_one","views_buckets","views_buckets_tasks_get"],"projects_views":["read_all"],"tasks":["read_all","read_one"],"tasks_comments":["read_all"]}
EOF
cat > "$S/scopes-pm.json" <<'EOF'
{"tasks":["read_one","create","update"],"tasks_assignees":["create","delete"],"tasks_relations":["create","delete"],"tasks_labels":["create","delete"],"tasks_comments":["create"],"labels":["read_all"],"projects":["views_buckets_tasks"]}
EOF
cat > "$S/scopes-worker.json" <<'EOF'
{"tasks":["read_one","update"],"tasks_comments":["create"],"projects":["views_buckets_tasks"]}
EOF

cto, coder and reviewer all use scopes-worker.json.

Tokens

mint sends the request, writes the token straight to its file, and prints only the metadata. Vikunja shows a token once.

mint() {  # mint ROLE BOT_ID SCOPES_FILE
  local r=$1 id=$2 sc=$3 resp="$S/.mint-$1.json"
  jq -n --arg t "$BIZ-$r-$(date +%F)" --argjson o "$id" --arg e "$EXP" --slurpfile p "$sc" \
     '{title:$t, owner_id:$o, expires_at:$e, permissions:$p[0]}' |
    api -X POST "$VK/api/v2/tokens" --data-binary @- -o "$resp" &&
  jq -j .token "$resp" > "$S/$r-vikunja.token" &&
  jq -c '{id, owner_id, expires_at, starts_tk: (.token | startswith("tk_"))}' "$resp"
  rm -f "$resp"
}
mint pm       <pm id>       "$S/scopes-pm.json"
mint cto      <cto id>      "$S/scopes-worker.json"
mint coder    <coder id>    "$S/scopes-worker.json"
mint reviewer <reviewer id> "$S/scopes-worker.json"
mint sync     <sync id>     "$S/scopes-sync.json"

Check that each line shows starts_tk: true and the expires_at you set. Vikunja accepts a past expiry without complaint, so read it. A 400 with code 14002 means a scope name is wrong. Fix the scope file and mint again.

4. Check and clean up

rm -f "$S/vikunja-owner.hdr"
stat -c '%a %s %n' "$S"/*.token

Each of the nine token files must show 600 and a nonzero size. Once row S3 lands, mosaic runs the broker's startup probe for every identity. It makes one control call and one call that must be refused, on a task id that doesn't exist, and it refuses to start on any surprise. That probe, passing for all nine, closes row SR's gate.

The business file (~/.config/mosaic-dev/businesses/mosaic-stack.json, row S1) references each file by absolute path, and never holds a value. One role's entry looks like this. Row S1's validator has the final shape.

"coder": { "definition": "coder",
           "tracker": { "bot": "bot-mosaic-stack-coder", "botId": 0 },
           "credentials": {
             "gitea":   { "file": "/home/you/.config/mosaic-dev/secrets/mosaic-stack/coder-gitea.token",   "rotateBy": "YYYY-MM-DD" },
             "vikunja": { "file": "/home/you/.config/mosaic-dev/secrets/mosaic-stack/coder-vikunja.token", "expires":  "YYYY-MM-DD" } } }

The sync bot has its own entry under the tracker settings, not under a role. The stack never writes this file.

5. Rotation

• Vikunja, before expires: log in as the owner (section 2), mint a new token for the same bot with mint, update expires in the business file, and restart the broker. Then revoke the old token: api -X DELETE "$VK/api/v2/tokens/<old id>". The broker refuses to start with a token past its expires, and it treats any 401 as a refusal, never a retry.
• Gitea, every 90 days or at once if a token may have leaked: log in as the bot, generate the replacement, write it to the file, restart the broker, then delete the old token in the same settings page. Update rotateBy. Each rotation gets one line in docs/SESSIONS.md: date, who, which identities, and no values.
• Revoking a role at once: delete its token, the Gitea one in the bot's settings and the Vikunja one with the DELETE above, or remove the bot's collaborator access or project share. The broker's next call gets a 401 or 403 and refuses.