obtain-github-app-installation-access-token

A simple CLI to obtain a GitHub App Installation Access Token.

npx obtain-github-app-installation-access-token \
  -a <appId> -i <installationId> -k <path/to/private-key.pem>

(An installation access token is then printed out to the standard output.)

This source code is compiled using @zeit/ncc into a single .js file which is then published to npm, so it installs and runs fast!

CI usage

In CI, usually you’d want to store your credentials as a token that contains no special characters or whitespaces, and also includes all the information needed.

You can generate such token by running the following Node.js script (replacing with the appropriate value):

console.log(
  Buffer.from(
    JSON.stringify({
      appId: '61290',
      installationId: '8099760',
      privateKey: `-----BEGIN RSA PRIVATE KEY-----
MIIEowIBAAKCAQEAmurnQ/dF3Y+S0vq46ROfEHQ9WUbmNMVmfikNAL09GCqdbE3V
W3r3N0+S7r4n93rs+70/L0v3+j00KN0w7/3h/RuL3s4ndS0D014+pHULl+k0Mm17
M3N7S/wh47+/1+M/7H1NK1N90Fj00w0uLdn7+9377H1SphR0M4Ny0+7H+3r+9uy/
1juS7++W4nN4+73lL/J00H0w1mPH33l/1n990774M4K/3j00UnD3rs74nDN3V3R9
0nn491v3/j00up/n3V3R+90nn4/l37J00D0WNn3V3R+90nN4RuN/4R0unD+4nD/d
3S3r7J00n3V3R/90nn4m4k3j00cRyN3v3R90nN4s4y900d8y3N3V3R+90Nn473lL
/4/L134NdHUr7J00/w3v3Kn0WN/34CH07H3RPh0R+s0L0n9J00rh34r7+s/833N/
4cH1N9+8u7+J00R3/700ShY++70S4Y17/1Ns1d3/W380/+7hKn0w+Wh47S//833n
+901n9//0N/W3k+N0w73H+94M3/4nD+w3+/r390nn4PL4y/174nD1fJ00+4SKM3H
H0w1+MPh33l1n9/d0N7/73llM3hj00+r3700/8L1nd/70S33/n3/V+3r90nN4/91
V3+J00Up+N3V3r+90nn4l37J00d0Wn/N3V3r/90NN4rUN+4R0Und/4ndD3+s3r7J
00/N3V3r90NN4/+m4k3+j00CRy+N3V3r+/90nn4+S4Y900d8y3/n3v3r90nN4+73
LL/4++l134Nd/HUR7/J00N3v3r//90Nn4+91v3+j00UP/n3v3R90Nn4/L37J00D/
0WNn3V3R90nN4R/U/n+4+r0UND4nd/D3s3r7j00+N3v3R+/90NN4M4K3/j00/crY
N3+V3r90nN/4+s4y900d8/Y3N3v3R/9/0nn4/73LL4/l134NDhur7/j00+N3V3r+
90NN/491v/3N3V3r+90nN491V391v3j00UP00hn3v3R++90nn4+91v3++N3V3R90
N+N491v391V3j0+0Up+w3v3+kn0WN/34ch07H3Rph0rS0/l0N9j00RH34r7s/833
N4CH1n98u7+j00r3/700+/sHY+70/s4y171ns1d3w3/807H/kN0wwh47/S/833N9
01N90N+/w3kN0w73H94M3/4NdW3r3/90NN4+PL4Y/+17+/1JUS7/w4Nn473LlJ00
h0w1m/PH33L1n990774M4k3/j00/und3RS74NdN3v3R90N+N491V3/J00u/PN3V3
R90nn4L37/J00+D0wnn3V3r90Nn4run4r0UNd4Ndd3S3r7+J00/N3v3r90NN4m4K
3J00CRY/n3v3R90NN4/s4y900D8y3n3v3r90+NN4+73LL4l13+4NdHUR7+j00n3V
3R/90Nn491V3J00UPn3V3r90nN4L37/J00+d0wnN3v3r90NN4ruN+4r0UND+4nD+
D3s++3r7J00N3v3r90NN4/M4K3j00+Cryn3V3R+90nn/4+S4Y900//D8y3n3v3R9
+0nN473Ll4L1+34NdhuR7J00N3V3r90NN4+91v3j00+uPn3V3r/9
-----END RSA PRIVATE KEY-----`,
    }),
  ).toString('base64'),
)

It results in this token, ready to be put into a CI:

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

Then you can run it:

npx obtain-github-app-installation-access-token ci "$TOKEN"

See .github/workflows/test.yml for example usage.