Goose
3563f311db
Move token generation logic from inline SKILL.md code blocks into a single scripts/generate-token.sh that agents can invoke directly. Adds env var validation, error handling, and gh CLI auth in one step. Co-Authored-By: Paperclip <noreply@paperclip.ing>
48 lines
1.8 KiB
Bash
Executable File
48 lines
1.8 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -euo pipefail
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die() { echo "ERROR: $*" >&2; exit 1; }
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# --- Validate required env vars ---
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[[ -z "${GITHUB_APP_ID:-}" ]] && die "GITHUB_APP_ID is not set"
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[[ -z "${GITHUB_APP_INSTALLATION_ID:-}" ]] && die "GITHUB_APP_INSTALLATION_ID is not set"
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[[ -z "${GITHUB_APP_PEM_FILE:-}" ]] && die "GITHUB_APP_PEM_FILE is not set"
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[[ ! -f "$GITHUB_APP_PEM_FILE" ]] && die "PEM file not found: $GITHUB_APP_PEM_FILE"
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for cmd in openssl curl jq gh; do
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command -v "$cmd" >/dev/null 2>&1 || die "Required command not found: $cmd"
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done
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# --- Build JWT (valid 10 minutes) ---
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b64url() { openssl enc -base64 -A | tr '+/' '-_' | tr -d '='; }
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NOW=$(date +%s)
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HEADER=$(printf '{"alg":"RS256","typ":"JWT"}' | b64url)
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PAYLOAD=$(printf '{"iat":%s,"exp":%s,"iss":"%s"}' "$NOW" "$((NOW + 600))" "$GITHUB_APP_ID" | b64url)
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SIGNED="${HEADER}.${PAYLOAD}"
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SIG=$(printf '%s' "$SIGNED" | openssl dgst -binary -sha256 -sign "$GITHUB_APP_PEM_FILE" | b64url)
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JWT="${SIGNED}.${SIG}"
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# --- Exchange JWT for installation access token ---
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RESPONSE=$(curl -sf -X POST \
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-H "Authorization: Bearer ${JWT}" \
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-H "Accept: application/vnd.github+json" \
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-H "X-GitHub-Api-Version: 2022-11-28" \
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"https://api.github.com/app/installations/${GITHUB_APP_INSTALLATION_ID}/access_tokens") \
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|| die "GitHub API request failed — check App ID, Installation ID, and PEM key"
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TOKEN=$(echo "$RESPONSE" | jq -r '.token // empty')
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[[ -z "$TOKEN" ]] && die "No token in GitHub response: $RESPONSE"
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# --- Write token to file ---
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GH_TOKEN_FILE="${AGENT_HOME:+${AGENT_HOME}/.gh-token}"
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GH_TOKEN_FILE="${GH_TOKEN_FILE:-$(mktemp)}"
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printf '%s' "$TOKEN" > "$GH_TOKEN_FILE"
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chmod 600 "$GH_TOKEN_FILE"
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# --- Authenticate gh CLI ---
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gh auth login --with-token < "$GH_TOKEN_FILE"
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echo "Authenticated. Token written to $GH_TOKEN_FILE (expires in 1 hour)."
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