(Tcl) 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 Tcl Extension Downloads Chilkat Tcl Extension Downloads

load ./chilkat.dll

# 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

set jsonToken [new_CkJsonObject]

set success [CkJsonObject_LoadFile $jsonToken "qa_data/tokens/mercadolibre.json"]
if {$success != 1} then {
    puts "Failed to load mercadolibre.json"
    delete_CkJsonObject $jsonToken
    exit
}

# 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"
# }

set oauth2 [new_CkOAuth2]

CkOAuth2_put_TokenEndpoint $oauth2 "https://api.mercadolibre.com/oauth/token"

# Replace these with actual values.
CkOAuth2_put_ClientId $oauth2 "MY_MERCADOLIBRE_APP_ID"
CkOAuth2_put_ClientSecret $oauth2 "MY_MERCADOLIBRE_APP_SECRET"

# Get the "refresh_token"
CkOAuth2_put_RefreshToken $oauth2 [CkJsonObject_stringOf $jsonToken "refresh_token"]

# Send the HTTP POST to refresh the access token..
set success [CkOAuth2_RefreshAccessToken $oauth2]
if {$success != 1} then {
    puts [CkOAuth2_lastErrorText $oauth2]
    delete_CkJsonObject $jsonToken
    delete_CkOAuth2 $oauth2
    exit
}

puts "New access token: [CkOAuth2_accessToken $oauth2]"
puts "New refresh token: [CkOAuth2_refreshToken $oauth2]"

# Update the JSON with the new tokens.
CkJsonObject_UpdateString $jsonToken "access_token" [CkOAuth2_accessToken $oauth2]
CkJsonObject_UpdateString $jsonToken "refresh_token" [CkOAuth2_refreshToken $oauth2]

# Save the new JSON access token response to a file.
set sbJson [new_CkStringBuilder]

CkJsonObject_put_EmitCompact $jsonToken 0
CkJsonObject_EmitSb $jsonToken $sbJson
CkStringBuilder_WriteFile $sbJson "qa_data/tokens/mercadolibre.json" "utf-8" 0

puts "OAuth2 authorization granted!"
puts "New Access Token = [CkOAuth2_accessToken $oauth2]"

delete_CkJsonObject $jsonToken
delete_CkOAuth2 $oauth2
delete_CkStringBuilder $sbJson