Lianja

Datev OAuth2 Access Token

See more Datev Examples

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

llSuccess = .F.

// To further clarify, see OAuth 2.0 Authorization Flow

loOauth2 = createobject("CkOAuth2")

// 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 = .T.
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 <> .T.) then
    ? loOauth2.LastErrorText
    release loOauth2
    return
endif

// Launch the default browser on the system and navigate to the url.
// The LaunchBrowser method was added in Chilkat v10.1.2.
llSuccess = loOauth2.LaunchBrowser(lcUrl)
if (llSuccess = .F.) then
    ? loOauth2.LastErrorText
    release loOauth2
    return
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
    return
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
    return
endif

if (loOauth2.AuthFlowState = 4) then
    ? "OAuth2 authorization was denied."
    ? loOauth2.AccessTokenResponse
    release loOauth2
    return
endif

if (loOauth2.AuthFlowState <> 3) then
    ? "Unexpected AuthFlowState:" + str(loOauth2.AuthFlowState)
    release loOauth2
    return
endif

// Save the full JSON access token response to a file.
loSbJson = createobject("CkStringBuilder")
loSbJson.Append(loOauth2.AccessTokenResponse)
loSbJson.WriteFile("qa_data/tokens/datev.json","utf-8",.F.)

// 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