ghprapprove.sh

#!/usr/bin/env bash

set -euo pipefail

ME=''
GITHUB_API_TOKEN=${GITHUB_API_TOKEN:-}
ACTION=false

CURL=${CURL:-curl}
JQ=${JQ:-jq}

usage()
{
cat <<USAGE
Approve pull requests at Github in given repositories.

Usage: '$0' [options] owner1/repo1 [owner2/repo2 ...]

Options are:
    
    -m      "me", my Github login. Will not approve PR created by this user.
    -a      Action! Default is dry-run, i. e. don't really approve.

    -h, -?  This help message

Environment variables:

GITHUB_API_TOKEN - exactly what it reads. Required.

USAGE
    exit 42
}

while getopts h?m:a opt; do
  case $opt in
    m) ME=$OPTARG;;
    a) ACTION=true;;
    *) usage;;
  esac
done
shift $((OPTIND - 1))
REPOS=( "$@" )


_request()
{
  $CURL -s -S  -f \
    -H "Authorization: token $GITHUB_API_TOKEN" \
    -H 'Accept: application/vnd.github.black-cat-preview+json' \
    "$@"
}

_POST()
{
  _request -X POST \
    -H 'Content-Type: application/json' \
    "$@"
}

_GET()
{
  _request -X GET \
    "$@"
}



_approve()
{
  local repo="$1"
  local pr="$2"

  # shellcheck disable=SC2016
  _POST \
    -d '{"event":"APPROVE", "body":"`¯\\_(ツ)_/¯`"}' \
    "https://api.github.com/repos/$repo/pulls/$pr/reviews"
}

_isApproved()
{
  local repo="$1"
  local pr="$2"
  _GET \
    "https://api.github.com/repos/$repo/pulls/$pr/reviews" \
    | $JQ -e '. | map(select(.state == "APPROVED")) | length > 0' >/dev/null
  
}

approve()
{
  local repo="$1"
  local pr="$2"
  if _isApproved "$repo" "$pr"; then
    echo "PR $pr in $repo is already approved" >&2
  else
    if $ACTION; then
      echo "Approving PR $pr in $repo" >&2
      _approve "$repo" "$pr" | $JQ -r '. | .pull_request_url'
    else
      echo "Would approve PR $pr in $repo" >&2
    fi
  fi
}

listPullRequests()
{
  local repo="$1"
  _GET \
    "https://api.github.com/repos/$repo/pulls?state=open&base=master" \
    | $JQ ". | map(select(.user.login != \"$ME\")) | .[] | .number"
}


for repo in "${REPOS[@]}"; do
  listPullRequests "$repo" \
    | while read -r pr; do
        echo "Checking PR $pr in $repo" >&2
        approve "$repo" "$pr"
      done
done