(PowerShell) Firebase JWT User Authentication

Demonstrates how to authenticate a Firebase REST API call using a JSON service account private key.

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

# First load the Firebase JSON private key into a string.
$fac = New-Object Chilkat.FileAccess
$jsonKey = $fac.ReadEntireTextFile("qa_data/firebase/fish-8abda-firebase-adminsdk-1ys3o-347d70d581.json","utf-8")
if ($fac.LastMethodSuccess -ne $true) {
    $($fac.LastErrorText)
    exit
}

# A JSON private key looks like this:

# {
#   "type": "service_account",
#   "project_id": "fish-8abda",
#   "private_key_id": "347e70d5810b92516905d2de12d292c16159375b",
#   "private_key": "-----BEGIN PRIVATE KEY-----\nMIIEvwIBADANBgkqhkiG9 ...  KQRtMB1gBu3KQxgoA==\n-----END PRIVATE KEY-----\n",
#   "client_email": "firebase-adminsdk-1ys3o@fish-8abda.iam.gserviceaccount.com",
#   "client_id": "107827947504591332107",
#   "auth_uri": "https://accounts.google.com/o/oauth2/auth",
#   "token_uri": "https://accounts.google.com/o/oauth2/token",
#   "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
#   "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/firebase-adminsdk-1ys3o%40fish-8abda.iam.gserviceaccount.com"
# }

$gAuth = New-Object Chilkat.AuthGoogle
$gAuth.JsonKey = $jsonKey

# Choose a scope.
# The scope could be "https://www.googleapis.com/auth/firebase.database"
# or
# "https://www.googleapis.com/auth/firebase.database https://www.googleapis.com/auth/userinfo.email"

$gAuth.Scope = "https://www.googleapis.com/auth/firebase.database https://www.googleapis.com/auth/userinfo.email"

# Request an access token that is valid for this many seconds.
$gAuth.ExpireNumSeconds = 3600

# If the application is requesting delegated access:
# The email address of the user for which the application is requesting delegated access,
# then set the email address here. (Otherwise leave it empty.)
$gAuth.SubEmailAddress = ""

# Connect to www.googleapis.com using TLS (TLS 1.2 is the default.)
# The Chilkat socket object is used so that the connection can be established
# through proxies or an SSH tunnel if desired.
$tlsSock = New-Object Chilkat.Socket
$success = $tlsSock.Connect("www.googleapis.com",443,$true,5000)
if ($success -ne $true) {
    $($tlsSock.LastErrorText)
    exit
}

# Send the request to obtain the access token.
$success = $gAuth.ObtainAccessToken($tlsSock)
if ($success -ne $true) {
    $($gAuth.LastErrorText)
    exit
}

# Examine the access token:
$("Firebase Access Token: " + $gAuth.AccessToken)

# Save the token to a file (or wherever desired).  This token is valid for 1 hour.
$fac.WriteEntireTextFile("qa_data/tokens/firebaseToken.txt",$gAuth.AccessToken,"utf-8",$false)