Lua

Download a Specific GMail Message into a Chilkat Email Object

See more GMail REST API Examples

Demonstrates how to download a GMail message into a Chilkat Email object. Lua

local chilkat = require("chilkat")

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

local http = chilkat.Http.new()
http.auth_token = "GMAIL-ACCESS-TOKEN"

-- The id of the GMail message to download.
local id = "166e50fed0b9b0cb"
local userId = "me"

http:set_url_var("userId", "me")
http:set_url_var("id", id)

-- Fetch the email.
local url = "https://www.googleapis.com/gmail/v1/users/{$userId}/messages/{$id}?format=raw"
local sbJson = chilkat.StringBuilder.new()
local success = http:download_sb(url, "utf-8", sbJson)
if not success then
    print(http.last_error_text)
    return
end

local json = chilkat.JsonObject.new()
json:load_sb(sbJson)
json.emit_compact = false

if http.last_status ~= 200 then
    print(json:emit())
    print("Failed.")
    return
end

-- The returned JSON contains something like this:

-- {
--   "id": "166e50fed0b9b0cb",
--   "threadId": "166e50fed0b9b0cb",
--   "labelIds": [
--     "CATEGORY_SOCIAL",
--     "INBOX"
--   ],
--   "snippet": "...",
--   "historyId": "582477",
--   "internalDate": "1541441317000",
--   "sizeEstimate": 28603,
--   "raw": "BASE64URL_CONTENT"
-- }

-- The RFC822 MIME of the email is contained in the "raw" as a base64URL encoded string.
-- Let's decode and load into a Chilkat email object..
local sbRaw = chilkat.StringBuilder.new()
json:string_of_sb("raw", sbRaw)
sbRaw:decode("base64url", "utf-8")

local email = chilkat.Email.new()
email:set_from_mime_sb(sbRaw)

-- Now we can use the email API to do whatever we desire..
print("From: " .. email.from_address)
print("Subject: " .. email.subject)
-- ...