Lua

Dropbox Refresh OAuth2 Access Token

See more Dropbox Examples

Demonstrates how to mint a new access token using the refresh token obtained when originally getting the OAuth2 access token. Lua

local chilkat = require("chilkat")

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

local http = chilkat.Http.new()

-- Implements the following CURL command:

-- curl -X GET https://api.dropbox.com/oauth2/token \
--     -d grant_type=refresh_token \
--     -d refresh_token=<YOUR_REFRESH_TOKEN> \
--     -u <YOUR_APP_KEY>:<YOUR_APP_SECRET>

-- Use the following online tool to generate HTTP code from a CURL command
-- Convert a cURL Command to HTTP Source Code

http.login = "DROPBOX_APP_KEY"
http.password = "DROPBOX_APP_SECRET"

-- Get the refresh token from the JSON we saved when originally getting the access token.
-- (See Get Dropbox OAuth2 Access Token w/ Refresh Token
local json = chilkat.JsonObject.new()
local success = json:load_file("qa_data/tokens/dropbox.json")
if not success then
    print(json.last_error_text)
    return
end

local req = chilkat.HttpRequest.new()
req:add_param("grant_type", "refresh_token")
req:add_param("refresh_token", json:string_of("refresh_token"))

req.http_verb = "POST"
req.content_type = "application/x-www-form-urlencoded"

local resp = chilkat.HttpResponse.new()
success = http:http_req("https://api.dropbox.com/oauth2/token", req, resp)
if not success then
    print(http.last_error_text)
    return
end

local sbResponseBody = chilkat.StringBuilder.new()
resp:get_body_sb(sbResponseBody)

local jResp = chilkat.JsonObject.new()
jResp:load_sb(sbResponseBody)
jResp.emit_compact = false

print("Response Body:")
print(jResp:emit())

local respStatusCode = resp.status_code
print("Response Status Code = " .. respStatusCode)
if respStatusCode >= 400 then
    print("Response Header:")
    print(resp.header)
    print("Failed.")
    return
end

-- Sample JSON response:
-- (Sample code for parsing the JSON response is shown below)

-- {
--   "access_token": "sl.AC75WPYRqOi0mxcRqlimbV9FKHu04biz5qHwatG3MTgzFK7kLrGVlM9EgP4603tE7bWw0s1rMbTKiHsf37TUshPYvq-3r0qeBr_PrZIAibN8XOQicvboiOnqx6JrDekq-w8D-tE",
--   "token_type": "bearer",
--   "expires_in": 14400
-- }

local access_token = jResp:string_of("access_token")
print("New Access Token: " .. access_token)

-- Perhaps update our Dropbox JSON file with the new access token.
-- (The existing refresh token does not change, and can be used over and over to mint new access tokens.)
json:update_string("access_token", access_token)

json:write_file("qa_data/tokens/dropbox.json")