GitHub App auth for Deno

A minimal Deno library and a CLI app to authenticate as a GitHub App installation.

Usage

CLI

Installation

deno install --allow-net=api.github.com https://deno.land/x/github_app_auth/cli.ts

Then you can use it as github_app_auth ....

Expected inputs

app-id: you can find it in the application settings
private-key: Base64-encoded content of the private key .pem file you got when you created the app
installation-id: organization or user installation ID you want to get access to
repositories (optional, trail-arg): list of repositories to give access to; if not provided, it will be all repositories that the installation can access

See the API endpoint documentation for more info.

GitHub API URL

If you need to change the default GitHub API URL, you can do it by setting the GITHUB_API_URL env var and adding --allow-env=GITHUB_API_URL when you install the script:

export GITHUB_API_URL='...'
deno install --allow-net="$GITHUB_API_URL" --allow-env='GITHUB_API_URL' https://deno.land/x/github_app_auth/cli.ts

Or use --allow-net --allow-env for simplicity.

Examples

Given app ID, private key and then installation ID it will create a new installation access token and print it to the standard output:

$ github_app_auth 123456 $(base64 < private-key.pem) 12345678
ghs_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

If you don't know the installation ID, you can run it with only the first two arguments and get a list of the app installations:

$ github_app_auth 123456 $(base64 < private-key.pem)
[
  {
    "id": 12345678,
    ...

You can use generated tokens to make requests on behalf on the app. Here are some examples using GitHub's official CLI gh, but you can also do it with curl or any other tool by adding the Authorization: token ... header.

$ GITHUB_TOKEN=$(github_app_auth 123456 $(base64 < private-key.pem) 12345678)

$ gh auth status
github.com
  ✓ Logged in to github.com as your-app-name[bot] (GITHUB_TOKEN)
  ✓ Git operations for github.com configured to use https protocol.
  ✓ Token: *******************

$ gh api installation/repositories --jq '.repositories[].name'
repo1
repo2
...

$ gh api repos/:owner/repo1/releases
...

Check out gh api docs for more examples and full feature list.