(PowerBuilder) Get Firebase Access Token from JSON Service Account Private Key

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:

Scroll down to see the example code...

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

integer li_rc
oleobject loo_Fac
string ls_JsonKey
oleobject loo_GAuth
oleobject loo_TlsSock
integer li_Success

// 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.
loo_Fac = create oleobject
// Use "Chilkat_9_5_0.FileAccess" for versions of Chilkat < 10.0.0
li_rc = loo_Fac.ConnectToNewObject("Chilkat.FileAccess")
if li_rc < 0 then
    destroy loo_Fac
    MessageBox("Error","Connecting to COM object failed")
    return
end if
ls_JsonKey = loo_Fac.ReadEntireTextFile("qa_data/firebase/firebase-chilkat-firebase-adminsdk-n28n4-1b664ee163.json","utf-8")
if loo_Fac.LastMethodSuccess <> 1 then
    Write-Debug loo_Fac.LastErrorText
    destroy loo_Fac
    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"
// } 
// 

loo_GAuth = create oleobject
// Use "Chilkat_9_5_0.AuthGoogle" for versions of Chilkat < 10.0.0
li_rc = loo_GAuth.ConnectToNewObject("Chilkat.AuthGoogle")

loo_GAuth.JsonKey = ls_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"

loo_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.
loo_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.)
loo_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.
loo_TlsSock = create oleobject
// Use "Chilkat_9_5_0.Socket" for versions of Chilkat < 10.0.0
li_rc = loo_TlsSock.ConnectToNewObject("Chilkat.Socket")

li_Success = loo_TlsSock.Connect("www.googleapis.com",443,1,5000)
if li_Success <> 1 then
    Write-Debug loo_TlsSock.LastErrorText
    destroy loo_Fac
    destroy loo_GAuth
    destroy loo_TlsSock
    return
end if

// Send the request to obtain the access token.
li_Success = loo_GAuth.ObtainAccessToken(loo_TlsSock)
if li_Success <> 1 then
    Write-Debug loo_GAuth.LastErrorText
    destroy loo_Fac
    destroy loo_GAuth
    destroy loo_TlsSock
    return
end if

// Examine the access token:
Write-Debug "Firebase Access Token: " + loo_GAuth.AccessToken

// Save the token to a file (or wherever desired).  This token is valid for 1 hour.
loo_Fac.WriteEntireTextFile("qa_data/tokens/firebaseToken.txt",loo_GAuth.AccessToken,"utf-8",0)


destroy loo_Fac
destroy loo_GAuth
destroy loo_TlsSock