Visual FoxPro

Google Translate API Refresh Access Token

See more Google Translate Examples

Demonstrates how to refresh a Google Access Token for the Google Translate API. Visual FoxPro

LOCAL lnSuccess
LOCAL loJsonToken
LOCAL loOauth2
LOCAL loSbJson

lnSuccess = 0

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

*  It is assumed we previously obtained an OAuth2 access token.
*  This example loads the JSON access token file 
*  saved by this example: Get Google Translate API OAuth2 Access Token

loJsonToken = CreateObject('Chilkat.JsonObject')
lnSuccess = loJsonToken.LoadFile("qa_data/tokens/_googleTranslate.json")
IF (lnSuccess <> 1) THEN
    ? "Failed to load _googleTranslate.json"
    RELEASE loJsonToken
    CANCEL
ENDIF

*  The access token JSON looks like this:

*  {
*    "access_token": "ya29.a0AfH6S ... LAZYFUkf0",
*    "expires_in": 3599,
*    "refresh_token": "1//0fL_Ov ... ee0",
*    "scope": "https://www.googleapis.com/auth/cloud-translation",
*    "token_type": "Bearer"
*  }

loOauth2 = CreateObject('Chilkat.OAuth2')

loOauth2.TokenEndpoint = "https://www.googleapis.com/oauth2/v4/token"

*  Replace these with actual values.
loOauth2.ClientId = "GOOGLE-CLIENT-ID"
loOauth2.ClientSecret = "GOOGLE-CLIENT-SECRET"

*  Get the "refresh_token"
loOauth2.RefreshToken = loJsonToken.StringOf("refresh_token")

*  Send the HTTP POST to refresh the access token..
lnSuccess = loOauth2.RefreshAccessToken()
IF (lnSuccess <> 1) THEN
    ? loOauth2.LastErrorText
    RELEASE loJsonToken
    RELEASE loOauth2
    CANCEL
ENDIF

*  The response contains a new access token, but we must keep
*  our existing refresh token for when we need to refresh again in the future.
loJsonToken.UpdateString("access_token",loOauth2.AccessToken)

*  Save the new JSON access token response to a file.
loSbJson = CreateObject('Chilkat.StringBuilder')
loJsonToken.EmitCompact = 0
loJsonToken.EmitSb(loSbJson)
loSbJson.WriteFile("qa_data/tokens/_googleTranslate.json","utf-8",0)

? "OAuth2 authorization granted!"
? "New Access Token = " + loOauth2.AccessToken

RELEASE loJsonToken
RELEASE loOauth2
RELEASE loSbJson