Lua

Download Google Contact Photo

See more Google APIs Examples

Demonstrates how to download Google Contact's photo. Lua

local chilkat = require("chilkat")

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

-- --------------------------------------------------------------------------------------------------------
-- Note: The code for setting up the Chilkat REST object and making the initial connection can be done once.
-- Once connected, the REST object may be re-used for many REST API calls.
-- (It's a good idea to put the connection setup code in a separate function/subroutine.)
-- --------------------------------------------------------------------------------------------------------

-- It is assumed we previously obtained an OAuth2 access token.
-- This example loads the JSON access token file
-- saved by this example: Get Google Contacts OAuth2 Access Token

local jsonToken = chilkat.JsonObject.new()
local success = jsonToken:load_file("qa_data/tokens/googleContacts.json")
if not success then
    print("Failed to load googleContacts.json")
    return
end

local gAuth = chilkat.AuthGoogle.new()
gAuth.access_token = jsonToken:string_of("access_token")

local rest = chilkat.Rest.new()

-- Connect using TLS.
local bAutoReconnect = true
success = rest:connect("www.google.com", 443, true, bAutoReconnect)

-- Provide the authentication credentials (i.e. the access token)
rest:set_auth_google(gAuth)

-- ----------------------------------------------
-- OK, the REST connection setup is completed..
-- ----------------------------------------------

-- To get the photo, send the following:

--     GET /m8/feeds/photos/media/default/contactId

rest:add_header("GData-Version", "3.0")

local sbPath = chilkat.StringBuilder.new()
-- Get the photo for the contact having contactId = "1ea2e4fe0ef24e09"
local contactId = "1ea2e4fe0ef24e09"
sbPath:set_string("/m8/feeds/photos/media/default/{contactId}")
local numReplacements = sbPath:replace("{contactId}", contactId)

local imageData = chilkat.BinData.new()
success = rest:full_request_no_body_bd("GET", sbPath:get_as_string(), imageData)
if not success then
    print(rest.last_error_text)
    return
end

-- A 404 response indicates the contact has no photo.
-- (We could've first fetched the contact information, parsed out the
-- photo etag, and then if no photo etag existed, we'd know the contact has no
-- photo.  Or... we can just try to download the photo and if a 404 is received,
-- we know there's no photo.  Much simpler.)
if rest.response_status_code == 404 then
    print("This contact has no photo.")
    return
end

-- A successful response will have a status code equal to 200.
if rest.response_status_code ~= 200 then
    -- If the response was not successful, then the response body
    -- does not contain image data.  Instead it contains XML.
    local sbResponseBody = chilkat.StringBuilder.new()
    sbResponseBody:append_bd(imageData, "utf-8", 0, 0)

    print("response status code = " .. rest.response_status_code)
    print("response status text = " .. rest.response_status_text)
    print("response header: " .. rest.response_header)
    print("response body: " .. sbResponseBody:get_as_string())
    print("request startline: " .. rest.last_request_start_line)
    print("request header: " .. rest.last_request_header)
    return
end

-- Examine the content-type in the response header so we know what file
-- extension to use (.jpg, .png, etc.)
local sbContentType = chilkat.StringBuilder.new()
sbContentType:append(rest:response_hdr_by_name("Content-Type"))

if sbContentType:contents_equal("image/jpeg", false) then
    imageData:write_file("qa_output/contact_photo.jpg")
end

if sbContentType:contents_equal("image/png", false) then
    imageData:write_file("qa_output/contact_photo.png")
end

print("Content-Type: " .. sbContentType:get_as_string())
print("Success.")