Visual FoxPro Requires Chilkat v10.1.2+

Adobe Sign OAuth2 Access Token

See more OAuth2 Examples

Demonstrates how to get an Adobe Sign OAuth2 access token from a desktop application or script. Visual FoxPro

LOCAL lnSuccess
LOCAL loOauth2
LOCAL lcUrl
LOCAL lnNumMsWaited
LOCAL loSbJson

lnSuccess = 0

*  To further clarify, see OAuth 2.0 Authorization Flow

loOauth2 = CreateObject('Chilkat.OAuth2')

*  The Adobe Sign OAuth2 requires an "https" callback URL.  This means the "http://localhost:<portNumber>/" is not possible.
*  For a desktop app, you must provide a script on your web server to redirect to "http://localhost:<portNumber>/"

*  See Using Your Web Server as an Intermediary for OAuth2 Redirect to localhost

loOauth2.AppCallbackUrl = "https://yourwebserver.com/OAuth2.php"
loOauth2.ListenPort = 3017

loOauth2.AuthorizationEndpoint = "https://secure.na2.echosign.com/public/oauth"
loOauth2.TokenEndpoint = "https://api.na2.echosign.com/oauth/token"

*  Replace these with actual values.
loOauth2.ClientId = "MY_CLIENT_ID"

*  This is for Require Proof Key for Code Exchange (PKCE)
*  See OAuth2 PKCE Explained
loOauth2.CodeChallenge = 1
loOauth2.CodeChallengeMethod = "S256"

*  Indicate the desired access by listing scopes.
loOauth2.Scope = "user_read agreement_read workflow_read"

*  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

? "url = " + lcUrl

*  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 user to approve or deny authorization in the browser.
lnNumMsWaited = 0
DO WHILE (lnNumMsWaited < 90000) AND (loOauth2.AuthFlowState < 3)
    loOauth2.SleepMs(100)
    lnNumMsWaited = lnNumMsWaited + 100
ENDDO

*  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 (loOauth2.AuthFlowState < 3) THEN
    loOauth2.Cancel()
    ? "No response from the browser!"
    RELEASE loOauth2
    CANCEL
ENDIF

*  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 (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.
loSbJson = CreateObject('Chilkat.StringBuilder')
loSbJson.Append(loOauth2.AccessTokenResponse)
loSbJson.WriteFile("qa_data/tokens/adobe-sign-access-token.json","utf-8",0)

*  The full JSON received looks like this:
*  {
*    "access_token": "3AAABL ... YCpUu",
*    "refresh_token": "3AAABL ... tpDs0*",
*    "token_type": "Bearer",
*    "expires_in": 3600
*  }

? "OAuth2 authorization granted!"
? "Access Token = " + loOauth2.AccessToken

RELEASE loOauth2
RELEASE loSbJson