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(DataFlex) Get GMail SMTP OAuth2 Access Token for Desktop AppSee more OAuth2 ExamplesThis example show how to obtain a Gmail SMTP OAuth2 access token from a desktop application or script, enabling the use of XOAUTH2 authentication.Note: This example requires Chilkat v10.1.2 or greater.
Use ChilkatAx-win32.pkg Procedure Test Handle hoOauth2 String sUrl Boolean iSuccess Integer iNumMsWaited Handle hoSbJson String sTemp1 Integer iTemp1 Boolean bTemp1 // To further clarify, see OAuth 2.0 Authorization Flow Get Create (RefClass(cComChilkatOAuth2)) To hoOauth2 If (Not(IsComObjectCreated(hoOauth2))) Begin Send CreateComObject of hoOauth2 End // For Google OAuth2, set the listen port equal to the port used // in the Authorized Redirect URL for the Client ID. // For example, in this case the Authorized Redirect URL would be http://localhost:55568/ // Your app should choose a port not likely not used by any other application. Set ComListenPort Of hoOauth2 To 55568 Set ComAuthorizationEndpoint Of hoOauth2 To "https://accounts.google.com/o/oauth2/v2/auth" Set ComTokenEndpoint Of hoOauth2 To "https://www.googleapis.com/oauth2/v4/token" // Replace these with actual values. Set ComClientId Of hoOauth2 To "GOOGLE-CLIENT-ID" Set ComClientSecret Of hoOauth2 To "GOOGLE-CLIENT-SECRET" // To use Gmail's OAuth2 for sending emails via the SMTP protocol, you need to request the https://mail.google.com/ scope. // See About GMail SMTP OAuth2 Scopes Set ComScope Of hoOauth2 To "https://mail.google.com/" // Begin the OAuth2 Authorization code flow. This returns a URL that should be loaded in a browser. Get ComStartAuth Of hoOauth2 To sUrl Get ComLastMethodSuccess Of hoOauth2 To bTemp1 If (bTemp1 <> True) Begin Get ComLastErrorText Of hoOauth2 To sTemp1 Showln sTemp1 Procedure_Return End // Launch the default browser on the system and navigate to the url. // The LaunchBrowser method was added in Chilkat v10.1.2. Get ComLaunchBrowser Of hoOauth2 sUrl To iSuccess If (iSuccess = False) Begin Get ComLastErrorText Of hoOauth2 To sTemp1 Showln sTemp1 Procedure_Return End // Wait for the user to approve or deny authorization in the browser. Move 0 To iNumMsWaited While ((iNumMsWaited < 90000) And ((ComAuthFlowState(hoOauth2)) < 3)) Send ComSleepMs To hoOauth2 100 Move (iNumMsWaited + 100) To iNumMsWaited Loop // 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. Get ComAuthFlowState Of hoOauth2 To iTemp1 If (iTemp1 < 3) Begin Get ComCancel Of hoOauth2 To iSuccess Showln "No response from the browser!" Procedure_Return End // 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. Get ComAuthFlowState Of hoOauth2 To iTemp1 If (iTemp1 = 5) Begin Showln "OAuth2 failed to complete." Get ComFailureInfo Of hoOauth2 To sTemp1 Showln sTemp1 Procedure_Return End Get ComAuthFlowState Of hoOauth2 To iTemp1 If (iTemp1 = 4) Begin Showln "OAuth2 authorization was denied." Get ComAccessTokenResponse Of hoOauth2 To sTemp1 Showln sTemp1 Procedure_Return End Get ComAuthFlowState Of hoOauth2 To iTemp1 If (iTemp1 <> 3) Begin Get ComAuthFlowState Of hoOauth2 To iTemp1 Showln "Unexpected AuthFlowState:" iTemp1 Procedure_Return End // Save the full JSON access token response to a file. Get Create (RefClass(cComChilkatStringBuilder)) To hoSbJson If (Not(IsComObjectCreated(hoSbJson))) Begin Send CreateComObject of hoSbJson End Get ComAccessTokenResponse Of hoOauth2 To sTemp1 Get ComAppend Of hoSbJson sTemp1 To iSuccess Get ComWriteFile Of hoSbJson "qa_data/tokens/_gmailSmtp.json" "utf-8" False To iSuccess // The saved JSON response looks like this: // { // "access_token": "ya39.Ci-XA_C5bGgRDC3UaD-h0_NeL-DVIQnI2gHtBBBHkZzrwlARkwX6R3O0PCDEzRlfaQ", // "token_type": "Bearer", // "expires_in": 3600, // "refresh_token": "1/r_2c_7jddspcdfesrrfKqfXtqo08D6Q-gUU0DsdfVMsx0c" // } // Showln "OAuth2 authorization granted!" Get ComAccessToken Of hoOauth2 To sTemp1 Showln "Access Token = " sTemp1 End_Procedure |
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