Classic ASP
Google Translate OAuth2 Access Token

Demonstrates how to get a Google OAuth2 access token for the Google Translate API from a desktop application or script.
Chilkat Classic ASP Downloads

Classic ASP
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<%
success = 0

' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

set oauth2 = Server.CreateObject("Chilkat.OAuth2")

' 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.
oauth2.ListenPort = 55568

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.CodeChallenge = 1
oauth2.CodeChallengeMethod = "S256"

' This is the scope for Google Translate.
' See https://developers.google.com/identity/protocols/googlescopes
oauth2.Scope = "https://www.googleapis.com/auth/cloud-translation"

' Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
url = oauth2.StartAuth()
If (oauth2.LastMethodSuccess = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( oauth2.LastErrorText) & "</pre>"
    Response.End
End If

' Launch the system's default browser navigated to the URL.
success = oauth2.LaunchBrowser(url)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( oauth2.LastErrorText) & "</pre>"
    Response.End
End If

' Now wait for the authorization.
' We'll wait for a max of 30 seconds.
numMsWaited = 0
Do While (numMsWaited < 30000) And (oauth2.AuthFlowState < 3)
    oauth2.SleepMs 100
    numMsWaited = numMsWaited + 100
Loop

' If there was no response from the browser within 30 seconds, then 
' the AuthFlowState will be equal to 1 or 2.
' 1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
' 2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response.
' In that case, cancel the background task started in the call to StartAuth.
If (oauth2.AuthFlowState < 3) Then
    success = oauth2.Cancel()
    Response.Write "<pre>" & Server.HTMLEncode( "No response from the browser!") & "</pre>"
    Response.End
End If

' Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
' The possible AuthFlowState values are:
' 3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
' 4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
' 5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
If (oauth2.AuthFlowState = 5) Then
    Response.Write "<pre>" & Server.HTMLEncode( "OAuth2 failed to complete.") & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( oauth2.FailureInfo) & "</pre>"
    Response.End
End If

If (oauth2.AuthFlowState = 4) Then
    Response.Write "<pre>" & Server.HTMLEncode( "OAuth2 authorization was denied.") & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( oauth2.AccessTokenResponse) & "</pre>"
    Response.End
End If

If (oauth2.AuthFlowState <> 3) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Unexpected AuthFlowState:" & oauth2.AuthFlowState) & "</pre>"
    Response.End
End If

' Save the full JSON access token response to a file.
set sbJson = Server.CreateObject("Chilkat.StringBuilder")
success = sbJson.Append(oauth2.AccessTokenResponse)
success = sbJson.WriteFile("qa_data/tokens/_googleTranslate.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"
' 	}
' 
Response.Write "<pre>" & Server.HTMLEncode( "OAuth2 authorization granted!") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "Access Token = " & oauth2.AccessToken) & "</pre>"

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