(Lianja) Get Google API Access Token using P12 Service Account Key

Demonstrates how to get a Google API access token using a P12 service account key.

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// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// First load the PKCS12 (.p12 / .pfx) into a PFX object.
loPfx = createobject("CkPfx")
llSuccess = loPfx.LoadPfxFile("qa_data/googleSvcAccountKeys/ChilkatCloud-6ba1b17d6d16.p12","notasecret")
if (llSuccess <> .T.) then
    ? loPfx.LastErrorText
    release loPfx
    return
endif

loGAuth = createobject("CkAuthGoogle")
llSuccess = loGAuth.SetP12(loPfx)

// Set the client email address.
loGAuth.EmailAddress = "pip-563@chilkatcloud.iam.gserviceaccount.com"

// Choose a scope.
loGAuth.Scope = "https://www.googleapis.com/auth/cloud-platform"

// Request an access token that is valid for this many seconds.
loGAuth.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.)
loGAuth.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.
loTlsSock = createobject("CkSocket")
llSuccess = loTlsSock.Connect("www.googleapis.com",443,.T.,5000)
if (llSuccess <> .T.) then
    ? loTlsSock.LastErrorText
    release loPfx
    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 loPfx
    release loGAuth
    release loTlsSock
    return
endif

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


release loPfx
release loGAuth
release loTlsSock