Lua

IMAP Auto-Refresh Office365 Access Token

See more Office365 Examples

Demonstrates how to automatically recover from an expired access token when OAuth2 authentication fails in the IMAP protocol. If the server responds with "NO AUTHENTICATE failed.", then we refresh the access token and retry. Lua

local chilkat = require("chilkat")

-- An Office365 OAuth2 access token must first be obtained prior
-- to running this code.

-- Getting the OAuth2 access token for the 1st time requires the O365 account owner's
-- interactive authorizaition via a web browser.  Afterwards, the access token
-- can be repeatedly refreshed automatically.

-- See the following examples for getting and refreshing an OAuth2 access token

-- Get Office365 SMTP/IMAP/POP3 OAuth2 Access Token
-- Refresh Office365 SMTP/IMAP/POP3 OAuth2 Access Token

-- First get our previously obtained OAuth2 access token.
local jsonToken = chilkat.JsonObject.new()
local success = jsonToken:load_file("qa_data/tokens/office365.json")
if not success then
    print("Failed to open the office365 OAuth JSON file.")
    return
end

local imap = chilkat.Imap.new()

imap.ssl = true
imap.port = 993

-- Connect to the Office365 IMAP server.
success = imap:connect("outlook.office365.com")
if not success then
    print(imap.last_error_text)
    return
end

-- Use OAuth2 authentication.
imap.auth_method = "XOAUTH2"

-- Login using our username (i.e. email address) and the access token for the password.
success = imap:login("OFFICE365_EMAIL_ADDRESS", jsonToken:string_of("access_token"))
if not success then
    local loginLastErrorText = imap.last_error_text

    -- If we're still connected to the mail server, then it means the server sent a non-success response,
    -- Such as:  NO AUTHENTICATE failed.
    if imap:is_connected() then
        -- Refresh the OAuth2 access token, and if successful, save the new (refreshed) access token and try authenticating again.
        local oauth2 = chilkat.OAuth2.new()

        -- Use your actual Directory (tenant) ID instead of "112d7ed6-71bf-4eba-a866-738364321bfc"
        oauth2.token_endpoint = "https://login.microsoftonline.com/112d7ed6-71bf-4eba-a866-738364321bfc/oauth2/v2.0/token"

        -- Replace these with your Azure App Registration's actual values.
        oauth2.client_id = "CLIENT_ID"
        oauth2.client_secret = "CLIENT_SECRET"

        -- Get the "refresh_token"
        oauth2.refresh_token = jsonToken:string_of("refresh_token")

        -- Send the HTTP POST to refresh the access token..
        success = oauth2:refresh_access_token()
        if not success then
            print(oauth2.last_error_text)
            return
        end

        print("New access token: " .. oauth2.access_token)
        print("New refresh token: " .. oauth2.refresh_token)

        -- Update the JSON with the new tokens.
        jsonToken:update_string("access_token", oauth2.access_token)
        jsonToken:update_string("refresh_token", oauth2.refresh_token)

        -- Save the new JSON access token response to a file.
        local sbJson = chilkat.StringBuilder.new()
        jsonToken.emit_compact = false
        jsonToken:emit_sb(sbJson)
        sbJson:write_file("qa_data/tokens/office365.json", "utf-8", false)

        print("New Access Token = " .. oauth2.access_token)

        -- Retry the login.
        success = imap:login("OFFICE365_EMAIL_ADDRESS", jsonToken:string_of("access_token"))
        if not success then
            print(imap.last_error_text)
            return
        end
    else
        -- Show the last error text for the call to Login
        print(loginLastErrorText)
        return
    end
else
    print("O365 OAuth authentication is successful.")
end

-- Do something...
success = imap:select_mailbox("Inbox")
if not success then
    print(imap.last_error_text)
    return
end

-- Your application can continue to do other things in the IMAP session....

-- When finished, logout and close the connection.
success = imap:logout()
success = imap:disconnect()

print("Finished.")