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(Visual FoxPro) Datev OAuth2 Access Token
Demonstrates how to get a Datev OAuth2 access token from a desktop application or script.Note: This example requires Chilkat v10.1.3 or greater.
LOCAL loOauth2
LOCAL lcUrl
LOCAL lnSuccess
LOCAL lnNumMsWaited
LOCAL loSbJson
* To further clarify, see OAuth 2.0 Authorization Flow
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.OAuth2')
loOauth2 = CreateObject('Chilkat.OAuth2')
* Your Datev app should use "http://localhost" (no trailing forward slash) for the redirect URL.
loOauth2.ListenPort = 3017
* 
loOauth2.AuthorizationEndpoint = "https://login.datev.de/openidsandbox/authorize"
loOauth2.TokenEndpoint = "https://sandbox-api.datev.de/token"
* Replace this with your actual client ID.
loOauth2.ClientId = "DATEV_CLIENT_ID"
loOauth2.ClientSecret = "DATEV_CLIENT_SECRET"
loOauth2.CodeChallenge = 1
loOauth2.CodeChallengeMethod = "S256"
loOauth2.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.
lcUrl = loOauth2.StartAuth()
IF (loOauth2.LastMethodSuccess <> 1) THEN
? loOauth2.LastErrorText
RELEASE loOauth2
CANCEL
ENDIF
* Launch the default browser on the system and navigate to the url.
* The LaunchBrowser method was added in Chilkat v10.1.2.
lnSuccess = loOauth2.LaunchBrowser(lcUrl)
IF (lnSuccess = 0) THEN
? loOauth2.LastErrorText
RELEASE loOauth2
CANCEL
ENDIF
* Wait for the interactive user to grant permission in the interactive browser session.
* We'll wait for a max of 90 seconds.
lnNumMsWaited = 0
DO WHILE (lnNumMsWaited < 90000) AND (loOauth2.AuthFlowState < 3)
loOauth2.SleepMs(100)
lnNumMsWaited = lnNumMsWaited + 100
ENDDO
* 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 (loOauth2.AuthFlowState < 3) THEN
loOauth2.Cancel()
? "No response from the browser!"
RELEASE loOauth2
CANCEL
ENDIF
* 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 (loOauth2.AuthFlowState = 5) THEN
? "OAuth2 failed to complete."
? loOauth2.FailureInfo
RELEASE loOauth2
CANCEL
ENDIF
IF (loOauth2.AuthFlowState = 4) THEN
? "OAuth2 authorization was denied."
? loOauth2.AccessTokenResponse
RELEASE loOauth2
CANCEL
ENDIF
IF (loOauth2.AuthFlowState <> 3) THEN
? "Unexpected AuthFlowState:" + STR(loOauth2.AuthFlowState)
RELEASE loOauth2
CANCEL
ENDIF
* Save the full JSON access token response to a file.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbJson = CreateObject('Chilkat.StringBuilder')
loSbJson.Append(loOauth2.AccessTokenResponse)
loSbJson.WriteFile("qa_data/tokens/datev.json","utf-8",0)
* 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
* }
? "OAuth2 authorization granted!"
? "Access Token = " + loOauth2.AccessToken
RELEASE loOauth2
RELEASE loSbJson
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