Xbase++

Firebase JWT User Authentication

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

LOCAL nSuccess
LOCAL oFac
LOCAL cJsonKey
LOCAL oGAuth
LOCAL oTlsSock

nSuccess := 0

//  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.
oFac := CreateObject("Chilkat.FileAccess")
cJsonKey := oFac:ReadEntireTextFile("qa_data/firebase/fish-8abda-firebase-adminsdk-1ys3o-347d70d581.json", "utf-8")
IF (oFac:LastMethodSuccess != 1)
    ? oFac:LastErrorText
    oFac:destroy()
    RETURN
ENDIF

//  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"
//  }

oGAuth := CreateObject("Chilkat.AuthGoogle")
oGAuth:JsonKey := cJsonKey

//  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"

oGAuth: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.
oGAuth: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.)
oGAuth: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.
oTlsSock := CreateObject("Chilkat.Socket")
nSuccess := oTlsSock:Connect("www.googleapis.com", 443, 1, 5000)
IF (nSuccess != 1)
    ? oTlsSock:LastErrorText
    oFac:destroy()
    oGAuth:destroy()
    oTlsSock:destroy()
    RETURN
ENDIF

//  Send the request to obtain the access token.
nSuccess := oGAuth:ObtainAccessToken(oTlsSock)
IF (nSuccess != 1)
    ? oGAuth:LastErrorText
    oFac:destroy()
    oGAuth:destroy()
    oTlsSock:destroy()
    RETURN
ENDIF

//  Examine the access token:
? "Firebase Access Token: " + oGAuth:AccessToken

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

oFac:destroy()
oGAuth:destroy()
oTlsSock:destroy()