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(Visual FoxPro) Dropbox: OAuth2 Authorization to Obtain an Access TokenDemonstrates how to get a Dropbox OAuth2 access token from a desktop application or script. This example runs the OAuth 2.0 authorization flow that lets the user sign in to Dropbox and authorize your app. Note: This example requires Chilkat v9.5.0.66 or greater to work properly.
LOCAL loOauth2 LOCAL lnSuccess LOCAL lcUrl LOCAL lnNumMsWaited * This example requires the Chilkat API to have been previously unlocked. * See Global Unlock Sample for sample code. * Note: This example requires Chilkat v9.5.0.66 or greater to work properly. loOauth2 = CreateObject('Chilkat_9_5_0.OAuth2') * The port should match the Authorized Redirect URL in your Dropbox app, * which would look like "http://localhost:3017/" loOauth2.ListenPort = 3017 * IMPORTANT: One of the OAuth2 redirect URIs for your Dropbox app must be * exactly this string: http://localhost:3017/ loOauth2.AuthorizationEndpoint = "https://www.dropbox.com/oauth2/authorize" loOauth2.TokenEndpoint = "https://api.dropboxapi.com/oauth2/token" * Replace these with actual values. loOauth2.ClientId = "DROPBOX_APP_KEY" loOauth2.ClientSecret = "DROPBOX_APP_SECRET" loOauth2.CodeChallenge = 0 * Begin the OAuth2 three-legged 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 * At this point, your application should load the URL in a browser. * For example, * in C#: System.Diagnostics.Process.Start(url); * in Java: Desktop.getDesktop().browse(new URI(url)); * in VBScript: Set wsh=WScript.CreateObject("WScript.Shell") * wsh.Run url * in Xojo: ShowURL(url) (see http://docs.xojo.com/index.php/ShowURL) * in Dataflex: Runprogram Background "c:\Program Files\Internet Explorer\iexplore.exe" sUrl * The Dropbox account owner would interactively accept or deny the authorization request. * Add the code to load the url in a web browser here... * Add the code to load the url in a web browser here... * Add the code to load the url in a web browser here... * Now wait for the authorization. * We'll wait for a max of 30 seconds. lnNumMsWaited = 0 DO WHILE (lnNumMsWaited < 30000) AND (loOauth2.AuthFlowState < 3) loOauth2.SleepMs(100) lnNumMsWaited = lnNumMsWaited + 100 ENDDO * If there was no response from the browser within 30 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 ? "OAuth2 authorization granted!" ? "Access Token Response = " + loOauth2.AccessTokenResponse * A sample access token response: * {"access_token": "1Eo84WCYYKAAAAAA ... 7jwQLcxCTsvHPlgy", "token_type": "bearer", * "uid": "563512681", "account_id": "dbid:AADQhET0E3_Vb72Ynd0F-vxGWeTI2qcTHbA"} ? "Access Token = " + loOauth2.AccessToken * Note: This example requires Chilkat v9.5.0.66 or greater to work properly. RELEASE loOauth2 |
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