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(PureBasic) 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.
IncludeFile "CkOAuth2.pb" IncludeFile "CkStringBuilder.pb" Procedure ChilkatExample() ; To further clarify, see OAuth 2.0 Authorization Flow oauth2.i = CkOAuth2::ckCreate() If oauth2.i = 0 Debug "Failed to create object." ProcedureReturn EndIf ; 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. CkOAuth2::setCkListenPort(oauth2, 55568) CkOAuth2::setCkAuthorizationEndpoint(oauth2, "https://accounts.google.com/o/oauth2/v2/auth") CkOAuth2::setCkTokenEndpoint(oauth2, "https://www.googleapis.com/oauth2/v4/token") ; Replace these with actual values. CkOAuth2::setCkClientId(oauth2, "GOOGLE-CLIENT-ID") CkOAuth2::setCkClientSecret(oauth2, "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 CkOAuth2::setCkScope(oauth2, "https://mail.google.com/") ; Begin the OAuth2 Authorization code flow. This returns a URL that should be loaded in a browser. url.s = CkOAuth2::ckStartAuth(oauth2) If CkOAuth2::ckLastMethodSuccess(oauth2) <> 1 Debug CkOAuth2::ckLastErrorText(oauth2) CkOAuth2::ckDispose(oauth2) ProcedureReturn EndIf ; Launch the default browser on the system and navigate to the url. ; The LaunchBrowser method was added in Chilkat v10.1.2. success.i = CkOAuth2::ckLaunchBrowser(oauth2,url) If success = 0 Debug CkOAuth2::ckLastErrorText(oauth2) CkOAuth2::ckDispose(oauth2) ProcedureReturn EndIf ; Wait for the user to approve or deny authorization in the browser. numMsWaited.i = 0 While (numMsWaited < 90000) AND (CkOAuth2::ckAuthFlowState(oauth2) < 3) CkOAuth2::ckSleepMs(oauth2,100) numMsWaited = numMsWaited + 100 Wend ; 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 CkOAuth2::ckAuthFlowState(oauth2) < 3 CkOAuth2::ckCancel(oauth2) Debug "No response from the browser!" CkOAuth2::ckDispose(oauth2) ProcedureReturn 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 CkOAuth2::ckAuthFlowState(oauth2) = 5 Debug "OAuth2 failed to complete." Debug CkOAuth2::ckFailureInfo(oauth2) CkOAuth2::ckDispose(oauth2) ProcedureReturn EndIf If CkOAuth2::ckAuthFlowState(oauth2) = 4 Debug "OAuth2 authorization was denied." Debug CkOAuth2::ckAccessTokenResponse(oauth2) CkOAuth2::ckDispose(oauth2) ProcedureReturn EndIf If CkOAuth2::ckAuthFlowState(oauth2) <> 3 Debug "Unexpected AuthFlowState:" + Str(CkOAuth2::ckAuthFlowState(oauth2)) CkOAuth2::ckDispose(oauth2) ProcedureReturn EndIf ; Save the full JSON access token response to a file. sbJson.i = CkStringBuilder::ckCreate() If sbJson.i = 0 Debug "Failed to create object." ProcedureReturn EndIf CkStringBuilder::ckAppend(sbJson,CkOAuth2::ckAccessTokenResponse(oauth2)) CkStringBuilder::ckWriteFile(sbJson,"qa_data/tokens/_gmailSmtp.json","utf-8",0) ; 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" ; } ; Debug "OAuth2 authorization granted!" Debug "Access Token = " + CkOAuth2::ckAccessToken(oauth2) CkOAuth2::ckDispose(oauth2) CkStringBuilder::ckDispose(sbJson) ProcedureReturn EndProcedure |
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