(Tcl) 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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load ./chilkat.dll

# 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.
set pfx [new_CkPfx]

set success [CkPfx_LoadPfxFile $pfx "qa_data/googleSvcAccountKeys/ChilkatCloud-6ba1b17d6d16.p12" "notasecret"]
if {$success != 1} then {
    puts [CkPfx_lastErrorText $pfx]
    delete_CkPfx $pfx
    exit
}

set gAuth [new_CkAuthGoogle]

set success [CkAuthGoogle_SetP12 $gAuth $pfx]

# Set the client email address.
CkAuthGoogle_put_EmailAddress $gAuth "pip-563@chilkatcloud.iam.gserviceaccount.com"

# Choose a scope.
CkAuthGoogle_put_Scope $gAuth "https://www.googleapis.com/auth/cloud-platform"

# Request an access token that is valid for this many seconds.
CkAuthGoogle_put_ExpireNumSeconds $gAuth 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.)
CkAuthGoogle_put_SubEmailAddress $gAuth ""

# 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.
set tlsSock [new_CkSocket]

set success [CkSocket_Connect $tlsSock "www.googleapis.com" 443 1 5000]
if {$success != 1} then {
    puts [CkSocket_lastErrorText $tlsSock]
    delete_CkPfx $pfx
    delete_CkAuthGoogle $gAuth
    delete_CkSocket $tlsSock
    exit
}

# Send the request to obtain the access token.
set success [CkAuthGoogle_ObtainAccessToken $gAuth $tlsSock]
if {$success != 1} then {
    puts [CkAuthGoogle_lastErrorText $gAuth]
    delete_CkPfx $pfx
    delete_CkAuthGoogle $gAuth
    delete_CkSocket $tlsSock
    exit
}

# Examine the access token:
puts "Access Token: [CkAuthGoogle_accessToken $gAuth]"

delete_CkPfx $pfx
delete_CkAuthGoogle $gAuth
delete_CkSocket $tlsSock