Chilkat Examples

ChilkatHOMEAndroid™Classic ASPCC++C#Mono C#.NET Core C#C# UWP/WinRTDataFlexDelphi ActiveXDelphi DLLVisual FoxProJavaLianjaMFCObjective-CPerlPHP ActiveXPHP ExtensionPowerBuilderPowerShellPureBasicCkPythonChilkat2-PythonRubySQL ServerSwift 2Swift 3,4,5...TclUnicode CUnicode C++Visual Basic 6.0VB.NETVB.NET UWP/WinRTVBScriptXojo PluginNode.jsExcelGo

Excel Examples

Web API Categories

ASN.1
Amazon EC2
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Azure Cloud Storage
Azure Service Bus
Azure Table Service
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Compression
DKIM / DomainKey
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
EBICS
ECC
Ed25519
Email Object
Encryption
FTP
FileAccess
Firebase
GMail REST API
GMail SMTP/IMAP/POP
Geolocation
Google APIs
Google Calendar
Google Cloud SQL
Google Cloud Storage
Google Drive
Google Photos
Google Sheets
Google Tasks
Gzip
HTML-to-XML/Text
HTTP

HTTP Misc
IMAP
JSON
JSON Web Encryption (JWE)
JSON Web Signatures (JWS)
JSON Web Token (JWT)
Java KeyStore (JKS)
MHT / HTML Email
MIME
MS Storage Providers
Microsoft Graph
NTLM
OAuth1
OAuth2
OIDC
Office365
OneDrive
OpenSSL
Outlook
Outlook Calendar
Outlook Contact
PDF Signatures
PEM
PFX/P12
PKCS11
POP3
PRNG
REST
REST Misc
RSA
SCP
SCard
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
ScMinidriver
SharePoint
Socket/SSL/TLS
Spider
Stream
Tar Archive
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl

 

 

 

(Excel) Google Drive Refresh Access Token

Demonstrates how to automatically refresh the access token when it expires.

Download Excel Class Modules

Chilkat Excel Class Modules

success = True

' It 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 
' Google Drive scope.

' The access token (and refresh token) was previously saved to a JSON file with this format:
' See Get Google Drive OAuth2 Access Token

' {
'   "access_token": "ya29.Gls-BsdxTWuenChv ... yzVIrXikkLxu5T6dy4I6GjADFardoz4Lruw",
'   "expires_in": 3600,
'   "refresh_token": "1/tMBJ ... 27D-Hk6rpQYBA",
'   "scope": "https://www.googleapis.com/auth/drive",
'   "token_type": "Bearer"
' }

Dim json As Chilkat.JsonObject
Set json = Chilkat.NewJsonObject

tokenFilePath = "qa_data/tokens/googleDrive.json"
Dim success As Boolean
success = json.LoadFile(tokenFilePath)

Dim oauth2 As Chilkat.OAuth2
Set oauth2 = Chilkat.NewOAuth2
oauth2.AccessToken = json.StringOf("access_token")
oauth2.RefreshToken = json.StringOf("refresh_token")

Dim rest As Chilkat.Rest
Set rest = Chilkat.NewRest

' Connect using TLS.

bAutoReconnect = True
success = rest.Connect("www.googleapis.com",443,True,bAutoReconnect)

' Provide the authentication credentials (i.e. the access token)
success = rest.SetAuthOAuth2(oauth2)

' We'll test with a simple request to empty trash.
' If our access token expired, we'll get a 401 response..

jsonResponse = rest.FullRequestNoBody("DELETE","/drive/v3/files/trash")
If (rest.LastMethodSuccess <> True) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

' If the access token expired, we'll get a 401 response status with this response body:
' {
'  "error": {
'   "errors": [
'    {
'     "domain": "global",
'     "reason": "authError",
'     "message": "Invalid Credentials",
'     "locationType": "header",
'     "location": "Authorization"
'    }
'   ],
'   "code": 401,
'   "message": "Invalid Credentials"
'  }
' }
If (rest.ResponseStatusCode = 401) Then

    Debug.Print "Refreshing access token..."

    oauth2.AuthorizationEndpoint = "https://accounts.google.com/o/oauth2/v2/auth"
    oauth2.TokenEndpoint = "https://www.googleapis.com/oauth2/v4/token"

    '  Replace these with actual values.
    oauth2.ClientId = "GOOGLE-CLIENT-ID"
    oauth2.ClientSecret = "GOOGLE-CLIENT-SECRET"
    oauth2.Scope = "https://www.googleapis.com/auth/drive"

    ' Use OAuth2 to refresh the access token.
    success = oauth2.RefreshAccessToken()
    If (success <> True) Then
        Debug.Print oauth2.LastErrorText
        Exit Sub
    End If

    ' Save the new access token to our XML file (so we can refresh it again when needed).
    success = json.UpdateString("access_token",oauth2.AccessToken)

    Dim fac As Chilkat.FileAccess
    Set fac = Chilkat.NewFileAccess
    success = fac.WriteEntireTextFile(tokenFilePath,json.Emit(),"utf-8",False)

    Debug.Print "Access Token Refreshed!"

    ' Retry the request with the new access token..
    jsonResponse = rest.FullRequestNoBody("DELETE","/drive/v3/files/trash")
    If (rest.LastMethodSuccess <> True) Then
        Debug.Print rest.LastErrorText
        Exit Sub
    End If

End If

' A successful response will have a status code equal to 204 and the response body is empty.
' (If not successful, then there should be a JSON response body with information..)
If (rest.ResponseStatusCode <> 204) Then
    Debug.Print "response status code = "; rest.ResponseStatusCode
    Debug.Print "response status text = "; rest.ResponseStatusText
    Debug.Print "response header: "; rest.ResponseHeader
    Debug.Print "response JSON: "; jsonResponse
    Exit Sub
End If

Debug.Print "Trash Emptied!"

 

© 2000-2022 Chilkat Software, Inc. All Rights Reserved.