local http = require("socket.http")
local ltn12 = require("ltn12")
local lfs = require "lfs"
http.TIMEOUT = 5

local function upload_file ( url, filename )
    local fileHandle = io.open( filename,"rb")
    if (fileHandle) then
        local fileContent = fileHandle:read( "*a" )
        fileHandle:close()
        local  boundary = 'abcd'
        local  header_b = 'Content-Disposition: form-data; name="file"; filename="' .. filename .. '"\r\nContent-Type: text/plain\r\n'
        local  fileContent =  '--' ..boundary .. '\r\n' ..header_b ..'\r\n'.. fileContent .. '\r\n--' .. boundary ..'--\r\n'
        local   response_body = { }
        local   _, code = http.request {
            url = url ,
            method = "POST",
            headers = {    ["Content-Length"] =  fileContent:len(),
                           ['Content-Type'] = 'multipart/form-data; boundary=' .. boundary
            },
            source = ltn12.source.string(fileContent) ,
            sink = ltn12.sink.table(response_body),
        }
        return code, table.concat(response_body)
    else
        return false, "File Not Found"
    end
end

local rc,content = upload_file ('http://127.0.0.1:826/api/upload', 'test.png' )
print(rc,content)


local function calc_token()

    -- Upyun upload parameters
    local operator = "operator123"
    local password = "password123"
    local bucket = "upyun-temp"

    local method = "POST"

    local save_key = "/demo.jpg"
    -- Get RFC1123 data
    local date = "Wed, 09 Nov 2016 14:26:58 GMT" -- RFC1123 date
    -- Generate upyun UCT time
    local utc_time = os.time(os.date("!*t"))
    print("utc_time...", utc_time, ngx.http_time(ngx.time()))
    -- Calculate upyun file expiration
    local expiration = "1478674618"
    local content_md5 = "7ac66c0f148de9519b8bd264312c4d64"
    local policy = string.format("{\"bucket\":\"%s\",\"save-key\":\"%s\",\"expiration\":\"%s\",\"date\":\"%s\",\"content-md5\":\"%s\"}", bucket, save_key, expiration, date, content_md5)
    print("policy....", policy, ngx.encode_base64(policy))
    local to_be_signed = method .. "&" .. "/" .. bucket .. "&" .. date .. "&" .. ngx.encode_base64(policy) .. '&' .. content_md5
    print('to be signed...', to_be_signed)
    print('md5 pwd...', ngx.md5(password))
    local hmac_sha1 = ngx.hmac_sha1(ngx.md5(password), to_be_signed)
    local signature = ngx.encode_base64(hmac_sha1)

    print("generated... " .. signature .. ", expected... k+fHTJndCFAraoeIrd60sJ/8Vb8=")
end

calc_token();