(Ruby) MercadoLibre Refresh OAuth2 Access Token

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.

For more information, see https://developers.mercadolibre.com.ar/es_ar/autenticacion-y-autorizacion#Refresh-token

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# 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

jsonToken = Chilkat::CkJsonObject.new()
success = jsonToken.LoadFile("qa_data/tokens/mercadolibre.json")
if (success != true)
    print "Failed to load mercadolibre.json" + "\n";
    exit
end

# 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"
# }

oauth2 = Chilkat::CkOAuth2.new()

oauth2.put_TokenEndpoint("https://api.mercadolibre.com/oauth/token")

# Replace these with actual values.
oauth2.put_ClientId("MY_MERCADOLIBRE_APP_ID")
oauth2.put_ClientSecret("MY_MERCADOLIBRE_APP_SECRET")

# Get the "refresh_token"
oauth2.put_RefreshToken(jsonToken.stringOf("refresh_token"))

# Send the HTTP POST to refresh the access token..
success = oauth2.RefreshAccessToken()
if (success != true)
    print oauth2.lastErrorText() + "\n";
    exit
end

print "New access token: " + oauth2.accessToken() + "\n";
print "New refresh token: " + oauth2.refreshToken() + "\n";

# Update the JSON with the new tokens.
jsonToken.UpdateString("access_token",oauth2.accessToken())
jsonToken.UpdateString("refresh_token",oauth2.refreshToken())

# Save the new JSON access token response to a file.
sbJson = Chilkat::CkStringBuilder.new()
jsonToken.put_EmitCompact(false)
jsonToken.EmitSb(sbJson)
sbJson.WriteFile("qa_data/tokens/mercadolibre.json","utf-8",false)

print "OAuth2 authorization granted!" + "\n";
print "New Access Token = " + oauth2.accessToken() + "\n";