Chilkat2-Python

Refresh a Dynamics CRM OAuth2 Access Token

See more OAuth2 Examples

Demonstrates how to refresh an expiring Dynamics CRM access token using the refresh token. endpoint.

(If a REST API call fails with a 401 unauthorized error, an application can auto-recover by refreshing the access token, and then re-send the request using the new token.)

Chilkat2-Python

import sys
import chilkat2

success = False

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

# We previously obtained an access token and saved the JSON to a file using this example:
# Get Dynamics CRM OAuth2 Access Token

# This example will examine the JSON and expiration date, and if near expiration will
# refresh the access token.

json = chilkat2.JsonObject()
success = json.LoadFile("qa_data/tokens/dynamicsCrm.json")
if (success != True):
    sys.exit()

# The contents of the JSON look like this:
# {
#   "token_type": "Bearer",
#   "scope": "user_impersonation",
#   "expires_in": "3599",
#   "ext_expires_in": "0",
#   "expires_on": "1524783438",
#   "not_before": "1524779538",
#   "resource": "https://mydomain.api.crm.dynamics.com",
#   "access_token": "...",
#   "refresh_token": "...",
#   "id_token": "..."
# }

# The "expires_on" value is a Unix time.
dtExpire = chilkat2.CkDateTime()
dtExpire.SetFromUnixTime(False,json.IntOf("expires_on"))

# If this date/time expires within 10 minutes of the current system time, refresh the token.

# OK, we need to refresh the access token by sending a POST...
# 

req = chilkat2.HttpRequest()
req.AddParam("grant_type","refresh_token")
req.AddParam("redirect_uri","http://localhost:3017/")
req.AddParam("client_id","DYNAMICS-CRM-CLIENT-ID")
req.AddParam("client_secret","DYNAMICS-CRM-SECRET-KEY")
req.AddParam("refresh_token",json.StringOf("refresh_token"))
req.AddParam("resource","https://mydynamicsdomain.api.crm.dynamics.com")

http = chilkat2.Http()

req.HttpVerb = "POST"
req.ContentType = "application/x-www-form-urlencoded"

resp = chilkat2.HttpResponse()
success = http.HttpReq("https://login.microsoftonline.com/DYNAMICS-ENDPOINT-GUID/oauth2/token",req,resp)
if (success == False):
    print(http.LastErrorText)
    sys.exit()

# Load the JSON response.
json.Load(resp.BodyStr)
json.EmitCompact = False

# Show the JSON response.
print(json.Emit())

print("Response status code: " + str(resp.StatusCode))

# If the response status code is not 200, then it's an error.
if (resp.StatusCode != 200):
    sys.exit()

# If an "expires_on" member does not exist, then add the JSON member by
# getting the current system date/time and adding the "expires_in" seconds.
# This way we'll know when the token expires.
if (json.HasMember("expires_on") != True):
    dtExpire.SetFromCurrentSystemTime()
    dtExpire.AddSeconds(json.IntOf("expires_in"))
    json.AppendString("expires_on",dtExpire.GetAsUnixTimeStr(False))

# Save the refreshed access token JSON to a file for future requests.
fac = chilkat2.FileAccess()
fac.WriteEntireTextFile("qa_data/tokens/dynamicsCrm.json",json.Emit(),"utf-8",False)