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(VBScript) 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.)
Dim fso, outFile Set fso = CreateObject("Scripting.FileSystemObject") Set outFile = fso.CreateTextFile("output.txt", True) ' 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.. set sbToken = CreateObject("Chilkat_9_5_0.StringBuilder") success = sbToken.LoadFile("qa_data/tokens/googleCloudStorageAccessToken.txt","utf-8") If (success = 0) Then outFile.WriteLine("Failed to load access token.") WScript.Quit End If set http = CreateObject("Chilkat_9_5_0.Http") http.AuthToken = sbToken.GetAsString() ' Construct a URL to download an object named "starfish.jpg" from the "chilkat-ocean" bucket. success = http.SetUrlVar("bucket_name","chilkat-ocean") success = http.SetUrlVar("object_name","starfish.jpg") url = "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.. set fileData = CreateObject("Chilkat_9_5_0.BinData") success = http.DownloadBd(url,fileData) responseCode = http.LastStatus If ((success = 0) And (responseCode <> 401)) Then outFile.WriteLine(http.LastErrorText) WScript.Quit End If If (responseCode = 401) Then outFile.WriteLine("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. set fac = CreateObject("Chilkat_9_5_0.FileAccess") jsonKey = fac.ReadEntireTextFile("qa_data/googleApi/ChilkatCloud-13a07a2e8b3f.json","utf-8") If (fac.LastMethodSuccess <> 1) Then outFile.WriteLine(fac.LastErrorText) WScript.Quit End If set gAuth = CreateObject("Chilkat_9_5_0.AuthGoogle") gAuth.JsonKey = jsonKey gAuth.Scope = "https://www.googleapis.com/auth/cloud-platform" gAuth.ExpireNumSeconds = 3600 gAuth.SubEmailAddress = "" set tlsSock = CreateObject("Chilkat_9_5_0.Socket") success = tlsSock.Connect("www.googleapis.com",443,1,5000) If (success <> 1) Then outFile.WriteLine(tlsSock.LastErrorText) WScript.Quit End If success = gAuth.ObtainAccessToken(tlsSock) If (success <> 1) Then outFile.WriteLine(gAuth.LastErrorText) WScript.Quit End If success = fac.WriteEntireTextFile("qa_data/tokens/googleCloudStorageAccessToken.txt",gAuth.AccessToken,"utf-8",0) ' Retry the original request. http.AuthToken = gAuth.AccessToken success = http.DownloadBd(url,fileData) If (success = 0) Then outFile.WriteLine(http.LastErrorText) WScript.Quit End If End If If (responseCode <> 200) Then ' Get the error response set sbErrorResponse = CreateObject("Chilkat_9_5_0.StringBuilder") success = sbErrorResponse.AppendBd(fileData,"utf-8",0,0) outFile.WriteLine("Error response code = " & responseCode) outFile.WriteLine("Error:") outFile.WriteLine(sbErrorResponse.GetAsString()) WScript.Quit End If outFile.WriteLine("Success.") ' Save the downloaded data to a file. success = fileData.WriteFile("qa_output/starfish.jpg") outFile.Close |
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