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Get Firebase Access Token from JSON Service Account Private Key

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Demonstrates how to get a Firebase access token using a JSON service account private key. Your Firebase service account can be used to authenticate multiple Firebase features, such as Database, Storage and Auth, programmatically.

A Firebase JSON service account private key can be created in the Firebase settings/admin portion of the console.firebase.google.com site as shown here:

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Dim success As Boolean = False

'  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.
Dim fac As ChilkatFileAccess
fac.Initialize
Dim jsonKey As String = fac.ReadEntireTextFile("qa_data/firebase/firebase-chilkat-firebase-adminsdk-n28n4-1b664ee163.json", "utf-8")
If fac.LastMethodSuccess <> True Then
    Log(fac.LastErrorText)
    Return
End If


'  A Firebase JSON private key should look something like this:

'  { 
'    "type": "service_account",
'    "project_id": "firebase-chilkat",
'    "private_key_id": "1c664ee164907413c91ddefcf5b765ecba8779e2",
'    "private_key": "-----BEGIN PRIVATE KEY-----\nMIIEvQIBA ... Ya2UZii/lXn73/ZOK8=\n-----END PRIVATE KEY-----\n",
'    "client_email": "firebase-adminsdk-n28n4@firebase-chilkat.iam.gserviceaccount.com",
'    "client_id": "134846322329335418431",
'    "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-n28n4%40firebase-chilkat.iam.gserviceaccount.com"
'  } 
'  

Dim gAuth As ChilkatAuthGoogle
gAuth.Initialize("gAuth")
gAuth.JsonKey = jsonKey

'  Choose a scope.
'  The scope could be "https://www.googleapis.com/auth/firebase.database"
'  or a space-delimited list of scopes:
'  "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.
Dim tlsSock As ChilkatSocket
tlsSock.Initialize("tlsSock")
success = tlsSock.Connect("www.googleapis.com", 443, True, 5000)
If success <> True Then
    Log(tlsSock.LastErrorText)
    Return
End If


'  Send the request to obtain the access token.
success = gAuth.ObtainAccessToken(tlsSock)
If success <> True Then
    Log(gAuth.LastErrorText)
    Return
End If


'  Examine the access token:
Log("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)