(Lianja) Get Access Token for Google Tasks using Service Account JSON Key

Demonstrates how to get an access token for the Google Tasks API using a Service Account JSON key.

Chilkat Lianja Extension Download Chilkat Lianja Extension

// 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.
loFac = createobject("CkFileAccess")
lcJsonKey = loFac.ReadEntireTextFile("qa_data/googleSvcAccountKeys/ChilkatCloud-48f7737c7505.json","utf-8")
if (loFac.LastMethodSuccess <> .T.) then
    ? loFac.LastErrorText
    release loFac
    return
endif

// A JSON private key should look like this:

// {
//   "type": "service_account",
//   "project_id": "chilkatcloud",
//   "private_key_id": "48f7737c7505bb88eee6a20d09993e10605d466e",
//   "private_key": "-----BEGIN PRIVATE KEY----- ... -----END PRIVATE KEY-----\n",
//   "client_email": "pip-564@chilkatcloud.iam.gserviceaccount.com",
//   "client_id": "109982228323456925225",
//   "auth_uri": "https://accounts.google.com/o/oauth2/auth",
//   "token_uri": "https://oauth2.googleapis.com/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/pip-564%40chilkatcloud.iam.gserviceaccount.com"
// }

loGAuth = createobject("CkAuthGoogle")
loGAuth.JsonKey = lcJsonKey

// Choose the scope for read/write access.
loGAuth.Scope = "https://www.googleapis.com/auth/tasks"

// Request an access token that is valid for this many seconds.
loGAuth.ExpireNumSeconds = 3600

loGAuth.SubEmailAddress = ""

// Connect to www.googleapis.com using TLS
loTlsSock = createobject("CkSocket")
llSuccess = loTlsSock.Connect("www.googleapis.com",443,.T.,5000)
if (llSuccess <> .T.) then
    ? loTlsSock.LastErrorText
    release loFac
    release loGAuth
    release loTlsSock
    return
endif

// Send the request to obtain the access token.
llSuccess = loGAuth.ObtainAccessToken(loTlsSock)
if (llSuccess <> .T.) then
    ? loGAuth.LastErrorText
    release loFac
    release loGAuth
    release loTlsSock
    return
endif

// Examine the access token:
? "Access Token: " + loGAuth.AccessToken

// Save our access token to a file.
llSuccess = loFac.WriteEntireTextFile("qa_data/tokens/googleTasks.txt",loGAuth.AccessToken,"utf-8",.F.)


release loFac
release loGAuth
release loTlsSock