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Chilkat2-Python

Salesforce OAuth2 Access Token

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Demonstrates how to get a Salesforce OAuth2 access token from a desktop application or script.

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import sys
import chilkat2

success = False

# To further clarify, see OAuth 2.0 Authorization Flow

oauth2 = chilkat2.OAuth2()

# This should be the port in the localhost callback URL for your connected app.  
# The callback URL would look like "http://localhost:3017/" if the port number is 3017.
oauth2.ListenPort = 3017

oauth2.AuthorizationEndpoint = "https://login.salesforce.com/services/oauth2/authorize"
oauth2.TokenEndpoint = "https://login.salesforce.com/services/oauth2/token"

# Replace this with your actual client ID (Consumer Key)
oauth2.ClientId = "CLIENT_ID"

# We don't have to include the client secret.
# See the screenshot of our Connected App below..

# This is for Require Proof Key for Code Exchange (PKCE)
# See OAuth2 PKCE Explained
oauth2.CodeChallenge = True
oauth2.CodeChallengeMethod = "S256"

# To force the OAuth consent screen to reappear (even if previously granted), use:
oauth2.AddAuthQueryParam("prompt","consent")

# Begin the OAuth2 authorization flow.  This returns a URL that should be loaded in a browser.
url = oauth2.StartAuth()
if (oauth2.LastMethodSuccess != True):
    print(oauth2.LastErrorText)
    sys.exit()

# Launch the default browser on the system and navigate to the url.
# The LaunchBrowser method was added in Chilkat v10.1.2.
success = oauth2.LaunchBrowser(url)
if (success == False):
    print(oauth2.LastErrorText)
    sys.exit()

# Wait for the user to approve or deny authorization in the browser.
numMsWaited = 0
while (numMsWaited < 90000) and (oauth2.AuthFlowState < 3) :
    oauth2.SleepMs(100)
    numMsWaited = numMsWaited + 100

# If the browser does not respond within the specified time, AuthFlowState will be:
# 
# 1: Waiting for Redirect – The OAuth2 background thread is waiting for the browser's redirect request.
# 2: Waiting for Final Response – The thread is awaiting the final access token response.
# In either case, cancel the background task initiated by StartAuth.

if (oauth2.AuthFlowState < 3):
    oauth2.Cancel()
    print("No response from the browser!")
    sys.exit()

# Check AuthFlowState to determine if authorization was granted, denied, or failed:
# 
# 3: Success – OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse.
# 4: Access Denied – OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse.
# 5: Failure – OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo.

if (oauth2.AuthFlowState == 5):
    print("OAuth2 failed to complete.")
    print(oauth2.FailureInfo)
    sys.exit()

if (oauth2.AuthFlowState == 4):
    print("OAuth2 authorization was denied.")
    print(oauth2.AccessTokenResponse)
    sys.exit()

if (oauth2.AuthFlowState != 3):
    print("Unexpected AuthFlowState:" + str(oauth2.AuthFlowState))
    sys.exit()

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

# Save the full JSON access token response to a file.
sbJson = chilkat2.StringBuilder()
sbJson.Append(oauth2.AccessTokenResponse)
sbJson.WriteFile("qa_data/tokens/_salesforce.json","utf-8",False)

# The saved JSON response looks like this:

# {
#   "access_token": "00D41000....uLZBpT6",
#   "refresh_token": "5Aep....25xdGgkrV",
#   "signature": "cjTbSc5DvcKpaMoRTzuQTJLb1tcMw8LEO01flq4aMD4=",
#   "scope": "refresh_token id",
#   "instance_url": "https://d41000000f8a0eak-dev-ed.my.salesforce.com",
#   "id": "https://login.salesforce.com/id/00D41000000F8A0EAK/005410000....xAAE",
#   "token_type": "Bearer",
#   "issued_at": "1738348388166"
# }

# --------------------------------------------------------------------------
# Here's a screenshot of a Salesforce Connected App 
# with the correct Callback URL for this example,
# and also selects "Require Proof Key for Code Exchange (PKCE)"
# and does not requires the secret for the authorization or refresh flow,
# and also allows for the Client Credentials flow.
# image