CkPython Requires Chilkat v10.1.3+

Datev OAuth2 Access Token

See more Datev Examples

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

import sys
import chilkat

success = False

#  To further clarify, see OAuth 2.0 Authorization Flow

oauth2 = chilkat.CkOAuth2()

#  Your Datev app should use "http://localhost" (no trailing forward slash) for the redirect URL.
oauth2.put_ListenPort(3017)

#  

oauth2.put_AuthorizationEndpoint("https://login.datev.de/openidsandbox/authorize")
oauth2.put_TokenEndpoint("https://sandbox-api.datev.de/token")

#  Replace this with your actual client ID.
oauth2.put_ClientId("DATEV_CLIENT_ID")
oauth2.put_ClientSecret("DATEV_CLIENT_SECRET")

oauth2.put_CodeChallenge(True)
oauth2.put_CodeChallengeMethod("S256")

oauth2.put_Scope("openid profile email datev:accounting:clients accounting:documents datev:accounting:extf-files-import")

#  Begin the OAuth2 authorization code flow.  This returns a URL that should be loaded in a browser.
url = oauth2.startAuth()
if (oauth2.get_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 interactive user to grant permission in the interactive browser session.
#  We'll wait for a max of 90 seconds.
numMsWaited = 0
while (numMsWaited < 90000) and (oauth2.get_AuthFlowState() < 3) :
    oauth2.SleepMs(100)
    numMsWaited = numMsWaited + 100

#  If there was no response from the browser within 90 seconds, then 
#  the AuthFlowState will be equal to 1 or 2.
#  1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
#  2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response.
#  In that case, cancel the background task started in the call to StartAuth.
if (oauth2.get_AuthFlowState() < 3):
    oauth2.Cancel()
    print("No response from the browser!")
    sys.exit()

#  Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
#  The possible AuthFlowState values are:
#  3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
#  4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
#  5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
if (oauth2.get_AuthFlowState() == 5):
    print("OAuth2 failed to complete.")
    print(oauth2.failureInfo())
    sys.exit()

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

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

#  Save the full JSON access token response to a file.
sbJson = chilkat.CkStringBuilder()
sbJson.Append(oauth2.accessTokenResponse())
sbJson.WriteFile("qa_data/tokens/datev.json","utf-8",False)

#  The saved JSON response looks like this:

#  {
#  	"refresh_token": "ZDA5Y .... FFhTXc9",
#  	"refresh_token_expires_in": 39600,
#  	"id_token": "eyJ .... Q9w",
#  	"access_token": "MTM .... 1UDA9",
#  	"token_type": "bearer",
#  	"expires_in": 900		
#  }

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