Lua Requires Chilkat v9.5.0.67+
Outlook --Download Attachments for a Specific Message

Demonstrates how to download the attachments for a particular email message.
Chilkat Lua Downloads

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()

-- Use your previously obtained access token here:
-- See the following examples for getting an access token:
--    Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
--    Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
--    Refresh Access Token (Azure AD v2.0 Endpoint).
--    Refresh Access Token (Azure AD Endpoint).

http.auth_token = "MICROSOFT_GRAPH_ACCESS_TOKEN"

local sbResponse = chilkat.StringBuilder.new()

-- Sends:  GET /users/{user_id | userPrincipalName}/messages/{message_id}/attachments
-- Note: It is also possible to use the literal string "me" for the current logged-on user.
-- For example: GET /me/messages/{message_id}/attachments

http:clear_url_vars()
http:set_url_var("userPrincipalName", "chilkatsoft@outlook.com")

-- Assume we already have a message ID from previously listing the messages in a folder
local messageId = "AAMkADYzZWE3YmZmLWU0YzgtNGNkZC04MGE1LWFiYTFlNTRlY2QwYQBGAAAAAAAu7cUXL5YOTrdsUIw7-v8FBwBUcG0qWqkmQYqWLHQataQxAACnwqJUAABUcG0qWqkmQYqWLHQataQxAACnwrnOAAA="
http:set_url_var("message_id", messageId)

-- Send the request to download the attachments.
local success = http:quick_get_sb("https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/messages/{$message_id}/attachments", sbResponse)
if (not success) and (http.last_status == 0) then
    print(http.last_error_text)
    return
end

-- The attachment data is contained within the JSON response.
local json = chilkat.JsonObject.new()
json:load_sb(sbResponse)
json.emit_compact = false

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

-- This is a sample JSON response.  The code for parsing and extracting/saving the attachments
-- is shown below.

--     {
--       "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users('chilkatsoft%40outlook.com')/messages('AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAA%3D%3D')/attachments",
--       "value": [
--         {
--           "@odata.type": "#microsoft.graph.fileAttachment",
--           "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAAESABAAft6wtbaSJU6sgQLi98DI0Q==",
--           "lastModifiedDateTime": "2017-05-10T00:30:51Z",
--           "name": "fishing.pdf",
--           "contentType": "application/pdf",
--           "size": 295680,
--           "isInline": false,
--           "contentId": "F861B218BE380F44B16933097FDDACFC@namprd20.prod.outlook.com",
--           "contentLocation": null,
--           "contentBytes": "JVBERi0xLjMKJcfsj6 ... yZWYKMjk0MzY5CiUlRU9GCg=="
--         },
--         {
--           "@odata.type": "#microsoft.graph.fileAttachment",
--           "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAAESABAAXS7qXQ-iRUCYXnhJpN8Ihg==",
--           "lastModifiedDateTime": "2017-05-10T00:30:51Z",
--           "name": "testCert.cer",
--           "contentType": "application/octet-stream",
--           "size": 1674,
--           "isInline": false,
--           "contentId": "5E51FA33EF0F8941ACC8260395CB1A33@namprd20.prod.outlook.com",
--           "contentLocation": null,
--           "contentBytes": "MIIFRjCCBC6gAwIBA ... 7pt3C5w=="
--         }
--       ]
--     }

local sbSavePath = chilkat.StringBuilder.new()
local attachData = chilkat.BinData.new()
local lastMod = chilkat.DateTime.new()
local fac = chilkat.FileAccess.new()

local i = 0
local numMessages = json:size_of_array("value")
while i < numMessages do
    json.i = i

    print("name: " .. json:string_of("value[i].name"))
    print("contentType: " .. json:string_of("value[i].contentType"))
    local sizeInBytes = json:int_of("value[i].size")
    print("size: " .. sizeInBytes)

    -- Extract the data and save to a file.
    sbSavePath:set_string("qa_output/")
    sbSavePath:append(json:string_of("value[i].name"))

    attachData:clear()
    attachData:append_encoded(json:string_of("value[i].contentBytes"), "base64")
    attachData:write_file(sbSavePath:get_as_string())

    -- Get the last-modified date/time and set the output file's last-mod date/time..
    lastMod:set_from_timestamp(json:string_of("value[i].lastModifiedDateTime"))
    fac:set_last_modified(sbSavePath:get_as_string(), lastMod)

    print("----")

    i = i + 1
end

-- The output of the above loop is:
--
--     name: fishing.pdf
--     contentType: application/pdf
--     size: 295680
--     ----
--     name: testCert.cer
--     contentType: application/octet-stream
--     size: 1674
--     ----
--