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SwitchBot API v1.1をRubyから呼び出す

Last updated at Posted at 2023-05-13

はじめに

SwitchBot API v1.1をPostmanから呼び出す に引き続き、RubyでSwitchBot APIを呼び出すテストを行いました。公式の SwitchBot Open API Documents にはPython, JavaScript, C#など代表的な言語のサンプルコードは用意されていますがなぜかRubyはなかったので参考になれば幸いです。

コード

SwitchBotAPIv11.rb
require 'openssl'
require 'securerandom'
require 'base64'
require 'httpclient'

def getDevices
    token = "92708d6a34f4ea9f4a79f..."
    secret = "00f394fc46f732b6..."
    t = (Time.now.to_f * 1000).to_i
    nonce = SecureRandom.uuid
    payload = "#{token}#{t}#{nonce}"
    signature = Base64.strict_encode64(OpenSSL::HMAC.digest('sha256', secret, payload))

    client = HTTPClient.new
    url = "https://api.switch-bot.com/v1.1/devices"
    header = { "Authorization" => token, "sign" => signature, "nonce" => nonce, "t" => t }
    response = client.get(url, header: header)
    puts (response.body)
end

getDevices

実行結果

$ ruby SwitchBotAPIv11.rb 
{"statusCode":100,"body":{"deviceList":[{"deviceId":"44179310230F","deviceName":"デバイス名"...

ハマったポイント

  • 唯一ハマったのがt(UnixTime)です。RubyのTime.now.to_iは秒単位までのUnixTimeしか返してくれず、Time.now.to_iで送っても応答はUnauthorizedになってしまいます。必要なのはミリ秒単位のUnixTimeなのですが、それを送るにはTime.now.to_f * 1000と小数のUnixTimeを1000倍してから整数に直すという力技が必要になります。
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