(CkPython) Docusign Refresh OAuth2 Access Token

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Demonstrates how to refresh a Docusign OAuth2 access token. The refresh does not require user interaction via a web browser. If an access token expires (typically with a 401 response code), a new access token can be automatically obtained by using the code in this example.

For more information, see https://developers.docusign.com/esign-rest-api/guides/authentication/oauth2-code-grant

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import sys
import chilkat

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

# It is assumed we previously obtained an OAuth2 access token.
# This example loads the JSON access token file 
# saved by this example: Get Docusign OAuth2 Access Token

jsonToken = chilkat.CkJsonObject()
success = jsonToken.LoadFile("qa_data/tokens/docusign.json")
if (success != True):
    print("Failed to load docusign.json")
    sys.exit()

# The access token JSON looks like this:

# {
#   "access_token": "eyJ0eXA....YQyig",
#   "token_type": "Bearer",
#   "refresh_token": "eyJ0eXA....auE3eHKg",
#   "expires_in": 28800
# }

oauth2 = chilkat.CkOAuth2()

# For the developer sandbox environment, the token endpoint is https://account-d.docusign.com/oauth/token
# For the production platform, the token endpoint is https://account.docusign.com/oauth/token
oauth2.put_TokenEndpoint("https://account-d.docusign.com/oauth/token")

# Replace these with actual values.
# The client ID is also known as the "integration key" in Docusign.
oauth2.put_ClientId("MY_DOCUSIGN_CLIENT_ID")
# This is your secret key for the authorization code grant.
oauth2.put_ClientSecret("MY_DOCUSIGN_CLIENT_SECRET")

# Get the "refresh_token"
oauth2.put_RefreshToken(jsonToken.stringOf("refresh_token"))

# Send the HTTP POST to refresh the access token..
success = oauth2.RefreshAccessToken()
if (success != True):
    print(oauth2.lastErrorText())
    sys.exit()

print("New access token: " + oauth2.accessToken())
print("New refresh token: " + oauth2.refreshToken())

# Update the JSON with the new tokens.
jsonToken.UpdateString("access_token",oauth2.accessToken())
jsonToken.UpdateString("refresh_token",oauth2.refreshToken())

# Save the new JSON access token response to a file.
sbJson = chilkat.CkStringBuilder()
jsonToken.put_EmitCompact(False)
jsonToken.EmitSb(sbJson)
sbJson.WriteFile("qa_data/tokens/docusign.json","utf-8",False)

print("OAuth2 authorization granted!")
print("New Access Token = " + oauth2.accessToken())