B4X

Get Google Cloud SQL Access Token using Service Account JSON Private Key

See more Google Cloud SQL Examples

Demonstrates how to get a Google Cloud SQL access token using a JSON service account private key. Obtaining an access token for a service account requires no user interaction (it does not require a browser, nor callback URI's, etc.).

When an access token expires, an application can be (and should be) designed to automatically fetch a new access token.

B4X

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 JSON key into a string.
Dim fac As ChilkatFileAccess
fac.Initialize
Dim jsonKey As String = fac.ReadEntireTextFile("qa_data/googleApi/ChilkatCloud-13a07a2e8b3f.json", "utf-8")
If fac.LastMethodSuccess <> True Then
    Log(fac.LastErrorText)
    Return
End If


'  A JSON private key should look something like this:

'  	{
'  	  "type": "service_account",
'  	  "project_id": "chilkattest-1350",
'  	  "private_key_id": "fa2e36ee26986eab628b59868af8bec1d1c64c38",
'  	  "private_key": "-----BEGIN PRIVATE KEY-----\nMIIEvgIjFa...28N64N2n1E4FYzBZjSdy\n-----END PRIVATE KEY-----\n",
'  	  "client_email": "598922945226-00rb0ppfg0sndajo6bhvd4v17jtj2d3a@developer.gserviceaccount.com",
'  	  "client_id": "598922945226-00rb0ppfg0snd9jo7bhvd4v17jtj2d3a.apps.googleusercontent.com",
'  	  "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/x509/598922945226-00rb0ppfg0sndajo6bhvd4v17jtj2d3a%40developer.gserviceaccount.com"
'  	}

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

'  Choose a scope.
'  Here's the OAuth 2.0 scope information for the Cloud SQL Admin API:
'  https://www.googleapis.com/auth/sqlservice.admin 	(Read/write access to Cloud SQL.)
'  https://www.googleapis.com/auth/cloud-platform 	(Instances.import and Instances.export need this additional scope.)
gAuth.Scope = "https://www.googleapis.com/auth/sqlservice.admin"

'  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("Access Token: " & gAuth.AccessToken)

'  Access token looks like this:  ya29.c.Ko4Bwwe3nG5rUvoBmJwadi ... Br4Ogz0B6qLAjg

'  We're going to save this access token to a file to be used
'  by other examples.
Dim sbToken As ChilkatStringBuilder
sbToken.Initialize
sbToken.Append(gAuth.AccessToken)
sbToken.WriteFile("qa_data/tokens/google_cloud_sql_access_token.txt", "utf-8", False)