Lua Requires Chilkat v10.1.2+

Slack OAuth2

See more OAuth2 Examples

Slack OAuth2 Lua

local chilkat = require("chilkat")

-- For more information about the OAuth2, see OAuth 2.0 Authorization Flow

local oauth2 = chilkat.OAuth2.new()

-- This example is for desktop applicatons (it is not for code that runs on a web server).

-- Your applicaton must use your own public web server as an intermediate
-- to receive and forward the redirect to localhost.
-- See Using Your Web Server as an Intermediary for OAuth2 Redirect to localhost

-- This is the Redirect URL defined for your Slack App in the Slack developer portal, and contains the above PHP.
oauth2.app_callback_url = "https://yourwebserver.com/oauth2_redirect"
oauth2.listen_port = 3017

oauth2.authorization_endpoint = "https://slack.com/oauth/authorize"
oauth2.token_endpoint = "https://slack.com/api/oauth.access"

-- Replace these with actual values.
oauth2.client_id = "CLIENT_ID"
oauth2.client_secret = "CLIENT_SECRET"

oauth2.scope = "team:read users:read"

-- Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
local url = oauth2:start_auth()
if not oauth2.last_method_success then
    print(oauth2.last_error_text)
    return
end

print("url = " .. url)

-- Launch the default browser on the system and navigate to the url.
local success = oauth2:launch_browser(url)
if not success then
    print(oauth2.last_error_text)
    return
end

-- Wait for the user to approve or deny authorization in the browser.
local numMsWaited = 0
while (numMsWaited < 90000) and (oauth2.auth_flow_state < 3) do
    oauth2:sleep_ms(100)
    numMsWaited = numMsWaited + 100
end

-- If the browser does not respond within the specified time, AuthFlowState will be:
--
-- 1: Waiting for Redirect - The OAuth2 background thread is waiting for the browser's redirect request.
-- 2: Waiting for Final Response - The thread is awaiting the final access token response.
-- In either case, cancel the background task initiated by StartAuth.

if oauth2.auth_flow_state < 3 then
    oauth2:cancel()
    print("No response from the browser!")
    return
end

-- Check AuthFlowState to determine if authorization was granted, denied, or failed:
--
-- 3: Success - OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse.
-- 4: Access Denied - OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse.
-- 5: Failure - OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo.

if oauth2.auth_flow_state == 5 then
    print("OAuth2 failed to complete.")
    print(oauth2.failure_info)
    return
end

if oauth2.auth_flow_state == 4 then
    print("OAuth2 authorization was denied.")
    print(oauth2.access_token_response)
    return
end

if oauth2.auth_flow_state ~= 3 then
    print("Unexpected AuthFlowState:" .. oauth2.auth_flow_state)
    return
end

print("OAuth2 authorization granted!")
print("Access Token = " .. oauth2.access_token)

-- Get the full JSON response:
local json = chilkat.JsonObject.new()
json:load(oauth2.access_token_response)
json.emit_compact = false

-- The JSON response looks like this:

-- {
--   "ok": true,
--   "access_token": "xoxp-348475395242-348621810805-4768936228341-9f512b295124e7c9846ce63cb1464c4d",
--   "scope": "identify,team:read,users:read",
--   "user_id": "UA8HZRUPP",
--   "team_id": "TA3DZBN74",
--   "enterprise_id": null,
--   "team_name": "Chilkat Testing"
-- }

print(json:emit())

-- Save the JSON to a file for future requests.
local fac = chilkat.FileAccess.new()
fac:write_entire_text_file("qa_data/tokens/slack.json", json:emit(), "utf-8", false)