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(Visual FoxPro) Refresh Access Token on 401 Unauthorized and RetryDemonstrates how to handle an expired access token error, refresh the token, and retry the request. (In this case, the request is to download an object from Google Cloud Storage.)
LOCAL loSbToken LOCAL lnSuccess LOCAL loHttp LOCAL lcUrl LOCAL loFileData LOCAL lnResponseCode LOCAL loFac LOCAL lcJsonKey LOCAL loGAuth LOCAL loTlsSock LOCAL loSbErrorResponse * This example requires the Chilkat API to have been previously unlocked. * See Global Unlock Sample for sample code. * This example uses a previously obtained access token having permission for the * scope "https://www.googleapis.com/auth/cloud-platform" * In this example, Get Google Cloud Storage OAuth2 Access Token, * the service account access token was saved to a text file. This example fetches the access token from the file.. loSbToken = CreateObject('Chilkat_9_5_0.StringBuilder') lnSuccess = loSbToken.LoadFile("qa_data/tokens/googleCloudStorageAccessToken.txt","utf-8") IF (lnSuccess = 0) THEN ? "Failed to load access token." RELEASE loSbToken CANCEL ENDIF loHttp = CreateObject('Chilkat_9_5_0.Http') loHttp.AuthToken = loSbToken.GetAsString() * Construct a URL to download an object named "starfish.jpg" from the "chilkat-ocean" bucket. loHttp.SetUrlVar("bucket_name","chilkat-ocean") loHttp.SetUrlVar("object_name","starfish.jpg") lcUrl = "https://www.googleapis.com/storage/v1/b/{$bucket_name}/o/{$object_name}?alt=media" * If there is an error response, then we didn't actually download the file data, * but instead we downloaded an error response.. loFileData = CreateObject('Chilkat_9_5_0.BinData') lnSuccess = loHttp.DownloadBd(lcUrl,loFileData) lnResponseCode = loHttp.LastStatus IF ((lnSuccess = 0) AND (lnResponseCode <> 401)) THEN ? loHttp.LastErrorText RELEASE loSbToken RELEASE loHttp RELEASE loFileData CANCEL ENDIF IF (lnResponseCode = 401) THEN ? "Received 401 Unauthorized response. Attempting to refresh the access token..." * May be that the access token expired. * Load our JSON key and request a new access token, then retry the original request. loFac = CreateObject('Chilkat_9_5_0.FileAccess') lcJsonKey = loFac.ReadEntireTextFile("qa_data/googleApi/ChilkatCloud-13a07a2e8b3f.json","utf-8") IF (loFac.LastMethodSuccess <> 1) THEN ? loFac.LastErrorText RELEASE loSbToken RELEASE loHttp RELEASE loFileData RELEASE loFac CANCEL ENDIF loGAuth = CreateObject('Chilkat_9_5_0.AuthGoogle') loGAuth.JsonKey = lcJsonKey loGAuth.Scope = "https://www.googleapis.com/auth/cloud-platform" loGAuth.ExpireNumSeconds = 3600 loGAuth.SubEmailAddress = "" loTlsSock = CreateObject('Chilkat_9_5_0.Socket') lnSuccess = loTlsSock.Connect("www.googleapis.com",443,1,5000) IF (lnSuccess <> 1) THEN ? loTlsSock.LastErrorText RELEASE loSbToken RELEASE loHttp RELEASE loFileData RELEASE loFac RELEASE loGAuth RELEASE loTlsSock CANCEL ENDIF lnSuccess = loGAuth.ObtainAccessToken(loTlsSock) IF (lnSuccess <> 1) THEN ? loGAuth.LastErrorText RELEASE loSbToken RELEASE loHttp RELEASE loFileData RELEASE loFac RELEASE loGAuth RELEASE loTlsSock CANCEL ENDIF loFac.WriteEntireTextFile("qa_data/tokens/googleCloudStorageAccessToken.txt",loGAuth.AccessToken,"utf-8",0) * Retry the original request. loHttp.AuthToken = loGAuth.AccessToken lnSuccess = loHttp.DownloadBd(lcUrl,loFileData) IF (lnSuccess = 0) THEN ? loHttp.LastErrorText RELEASE loSbToken RELEASE loHttp RELEASE loFileData RELEASE loFac RELEASE loGAuth RELEASE loTlsSock CANCEL ENDIF ENDIF IF (lnResponseCode <> 200) THEN * Get the error response loSbErrorResponse = CreateObject('Chilkat_9_5_0.StringBuilder') loSbErrorResponse.AppendBd(loFileData,"utf-8",0,0) ? "Error response code = " + STR(lnResponseCode) ? "Error:" ? loSbErrorResponse.GetAsString() RELEASE loSbToken RELEASE loHttp RELEASE loFileData RELEASE loFac RELEASE loGAuth RELEASE loTlsSock RELEASE loSbErrorResponse CANCEL ENDIF ? "Success." * Save the downloaded data to a file. lnSuccess = loFileData.WriteFile("qa_output/starfish.jpg") RELEASE loSbToken RELEASE loHttp RELEASE loFileData RELEASE loFac RELEASE loGAuth RELEASE loTlsSock RELEASE loSbErrorResponse |
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