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(Chilkat2-Python) Get Google API Access Token using JSON Private KeyDemonstrates how to get a Google API access token using a JSON service account private key.
import sys import chilkat2 # This example requires the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. # -------------------------------------------------------------------------------- # For a step-by-step guide for setting up your Google Workspace service account, # see Setup Google Workspace Account for Sending SMTP GMail from a Service Account # -------------------------------------------------------------------------------- # First load the JSON key into a string. fac = chilkat2.FileAccess() jsonKey = fac.ReadEntireTextFile("qa_data/googleApi/chilkat25-b4214220e565.json","utf-8") if (fac.LastMethodSuccess != True): print(fac.LastErrorText) sys.exit() # A Google service account JSON private key looks like this: # { # "type": "service_account", # "project_id": "chilkat25", # "private_key_id": "b4214220f565881e19eeb97c2699bf5a0d1e3e0b", # "private_key": "-----BEGIN PRIVATE KEY-----\nMIIEvQ...NXcM=\n-----END PRIVATE KEY-----\n", # "client_email": "chilkatsvc@chilkat25.iam.gserviceaccount.com", # "client_id": "109122032928932715958", # "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/chilkatsvc%40chilkat25.iam.gserviceaccount.com", # "universe_domain": "googleapis.com" # } gAuth = chilkat2.AuthGoogle() gAuth.JsonKey = jsonKey # Specify a scope. gAuth.Scope = "https://mail.google.com/" # Request an access token that is valid for this many seconds. gAuth.ExpireNumSeconds = 3600 # When using a Google Workspace account with Gmail APIs, a service account can impersonate a user # via a process called domain-wide delegation — and the "sub" claim in the JWT is what enables this. # Domain-wide delegation allows a Google Workspace administrator to authorize a service account to # act on behalf of any user in the domain, without user interaction. # This is required for server-to-server access to user data — such as reading/sending Gmail from a background service. # This is your company email address. gAuth.SubEmailAddress = "info@chilkat.xyz" # Connect to www.googleapis.com using TLS tlsSock = chilkat2.Socket() success = tlsSock.Connect("www.googleapis.com",443,True,5000) if (success != True): print(tlsSock.LastErrorText) sys.exit() # Send the request to obtain the access token. success = gAuth.ObtainAccessToken(tlsSock) if (success != True): print(gAuth.LastErrorText) sys.exit() # Examine the access token: accessToken = gAuth.AccessToken print("Access Token: " + accessToken) # Sample output: # ya29.a0AW4XtxjGTD67Z8 .... IRw0218 # The access token allows us to send unlimited emails while it's valid. Once it expires, we must obtain and use a new one. # ----------------------------------------------------------------------- mailman = chilkat2.MailMan() # Set the properties for the GMail SMTP server: mailman.SmtpHost = "smtp.gmail.com" mailman.SmtpPort = 587 mailman.StartTLS = True mailman.SmtpUsername = "info@chilkat.xyz" mailman.OAuth2AccessToken = accessToken # Create a new email object email = chilkat2.Email() email.Subject = "This is a test" email.Body = "This is a test" email.From = "Chilkat Test <info@chilkat.xyz>" success = email.AddTo("Chilkat Software","info@chilkatsoft.com") # To add more recipients, call AddTo, AddCC, or AddBcc once per recipient. success = mailman.SendEmail(email) if (success != True): print(mailman.LastErrorText) sys.exit() success = mailman.CloseSmtpConnection() if (success != True): print("Connection to SMTP server not closed cleanly.") print("Successfully sent email using Gmail with a service account key.") |
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