Xbase++

MercadoLibre Refresh OAuth2 Access Token

See more MercadoLibre Examples

Demonstrates how to refresh a MercadoLibre OAuth2 access token. The refresh does not require user interaction via a web browser. If an access token expires (typically with a 401 response code), a new access token can be automatically obtained by using the code in this example. Xbase++

LOCAL nSuccess
LOCAL oJsonToken
LOCAL oOauth2
LOCAL oSbJson

nSuccess := 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 MercadoLibre OAuth2 Access Token

oJsonToken := CreateObject("Chilkat.JsonObject")
nSuccess := oJsonToken:LoadFile("qa_data/tokens/mercadolibre.json")
IF (nSuccess != 1)
    ? "Failed to load mercadolibre.json"
    oJsonToken:destroy()
    RETURN
ENDIF

//  The access token JSON looks like this:

//  {
//    "access_token": "APP_USR-8133606632685744-060115-93e1fd8b5e767c51c238df347bd0b288-577628017",
//    "token_type": "bearer",
//    "expires_in": 21600,
//    "scope": "offline_access read write",
//    "user_id": 577625107,
//    "refresh_token": "TG-5ad522a286f1200006ac4ed1-577625007"
//  }

oOauth2 := CreateObject("Chilkat.OAuth2")

oOauth2:TokenEndpoint := "https://api.mercadolibre.com/oauth/token"

//  Replace these with actual values.
oOauth2:ClientId := "MY_MERCADOLIBRE_APP_ID"
oOauth2:ClientSecret := "MY_MERCADOLIBRE_APP_SECRET"

//  Get the "refresh_token"
oOauth2:RefreshToken := oJsonToken:StringOf("refresh_token")

//  Send the HTTP POST to refresh the access token..
nSuccess := oOauth2:RefreshAccessToken()
IF (nSuccess != 1)
    ? oOauth2:LastErrorText
    oJsonToken:destroy()
    oOauth2:destroy()
    RETURN
ENDIF

? "New access token: " + oOauth2:AccessToken
? "New refresh token: " + oOauth2:RefreshToken

//  Update the JSON with the new tokens.
oJsonToken:UpdateString("access_token", oOauth2:AccessToken)
oJsonToken:UpdateString("refresh_token", oOauth2:RefreshToken)

//  Save the new JSON access token response to a file.
oSbJson := CreateObject("Chilkat.StringBuilder")
oJsonToken:EmitCompact := 0
oJsonToken:EmitSb(oSbJson)
oSbJson:WriteFile("qa_data/tokens/mercadolibre.json", "utf-8", 0)

? "OAuth2 authorization granted!"
? "New Access Token = " + oOauth2:AccessToken

oJsonToken:destroy()
oOauth2:destroy()
oSbJson:destroy()