(Tcl) Rabobank Refresh OAuth2 Access Token

Demonstrates how to refresh an expired Rabobank OAuth2 access token. (No interactive user interaction is required to refresh an access token.)

For more information, see https://developer.rabobank.nl/implementoauth2

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load ./chilkat.dll

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

# We previously obtained an access token and saved the JSON to a file using this example:
# Get Rabobank OAuth2 Access Token

set json [new_CkJsonObject]

set success [CkJsonObject_LoadFile $json "qa_data/tokens/rabobank.json"]
if {$success != 1} then {
    delete_CkJsonObject $json
    exit
}

# {
#   "token_type": "Bearer",
#   "access_token": "AAIkYTU0ZWM ... sxE0KL0HHWw",
#   "expires_in": 3600,
#   "consented_on": 1584641121,
#   "scope": "ais.balances.read ais.transactions.read-90days ais.transactions.read-history",
#   "refresh_token": "AAJXXSdN ... Uiblz9ILkxNBlytRGA",
#   "refresh_token_expires_in": 157784760,
#   "expires_on": "1584644722"
# }

# Refresh the access token by sending a POST like this:
# 

# POST /oauth2/token
# Headers:
#     Content-Type: application/x-www-form-urlencoded
#     Authorization: Basic BASE64(CLIENT_ID + ":" + CLIENT_SECRET)
# 
# Body (x-www-form-urlencoded):
#     grant_type: refresh_token
#     refresh_token: REFRESH_TOKEN

set req [new_CkHttpRequest]

CkHttpRequest_AddParam $req "grant_type" "refresh_token"
CkHttpRequest_AddParam $req "refresh_token" [CkJsonObject_stringOf $json "refresh_token"]

set http [new_CkHttp]

# Causes the "Authorization: Basic BASE64(CLIENT_ID + ":" + CLIENT_SECRET)" header to be added..
CkHttp_put_BasicAuth $http 1
CkHttp_put_Login $http "YOUR_APP_CLIENT_ID"
CkHttp_put_Password $http "YOUR_APP_CLIENT_SECRET"

# resp is a CkHttpResponse
set resp [CkHttp_PostUrlEncoded $http "https://api-sandbox.rabobank.nl/openapi/sandbox/oauth2/token" $req]
if {[CkHttp_get_LastMethodSuccess $http] != 1} then {
    puts [CkHttp_lastErrorText $http]
    delete_CkJsonObject $json
    delete_CkHttpRequest $req
    delete_CkHttp $http
    exit
}

# Load the JSON response.
CkJsonObject_Load $json [CkHttpResponse_bodyStr $resp]
CkJsonObject_put_EmitCompact $json 0

# Show the JSON response.
puts [CkJsonObject_emit $json]

puts "Response status code: [CkHttpResponse_get_StatusCode $resp]"

# If the response status code is not 200, then it's an error.
if {[CkHttpResponse_get_StatusCode $resp] != 200} then {
    delete_CkJsonObject $json
    delete_CkHttpRequest $req
    delete_CkHttp $http
    exit
}

delete_CkHttpResponse $resp

# Save the refreshed access token JSON to a file for future requests.
set fac [new_CkFileAccess]

CkFileAccess_WriteEntireTextFile $fac "qa_data/tokens/rabobank.json" [CkJsonObject_emit $json] "utf-8" 0

delete_CkJsonObject $json
delete_CkHttpRequest $req
delete_CkHttp $http
delete_CkFileAccess $fac