Configure Google Service Account Authentication for REST

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Demonstrates Rest.SetAuthGoogle, which associates an AuthGoogle provider so Chilkat supplies a Google OAuth 2.0 bearer token on each request. The provider is configured with a service account JSON key and the required OAuth scope.

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

require 'chilkat'

success = false

rest = Chilkat::CkRest.new()
bTls = true
bAutoReconnect = true
success = rest.Connect("example.com",443,bTls,bAutoReconnect)
if (success == false)
    print rest.lastErrorText() + "\n";
    exit
end

#  Configure Google service-account authentication.  Load the service account JSON key and set the
#  required OAuth scope(s).
gAuth = Chilkat::CkAuthGoogle.new()

sbJsonKey = Chilkat::CkStringBuilder.new()
bLoaded = sbJsonKey.LoadFile("qa_data/service_account.json")
if (bLoaded != true)
    print "Failed to load the service account JSON key." + "\n";
    exit
end

jsonKey = sbJsonKey.getAsString()
if (sbJsonKey.get_LastMethodSuccess() == false)
    print sbJsonKey.lastErrorText() + "\n";
    exit
end

gAuth.put_JsonKey(jsonKey)

#  A space-delimited list of the requested permissions.
gAuth.put_Scope("https://www.googleapis.com/auth/cloud-platform")

#  Associate the provider so Chilkat supplies a Google bearer token on each request.
success = rest.SetAuthGoogle(gAuth)
if (success == false)
    print rest.lastErrorText() + "\n";
    exit
end

responseText = rest.fullRequestNoBody("GET","/storage/v1/b?project=my-project")
if (rest.get_LastMethodSuccess() == false)
    print rest.lastErrorText() + "\n";
    exit
end

print responseText + "\n";