[ Ruby on Rails ] 簡單好用的驗證碼Gem – Redis Captcha-Mysql Tutorial-php.cn

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[ Ruby on Rails ] 簡單好用的驗證碼Gem – Redis Captcha

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Jun 07, 2016 pm 04:27 PM

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RedisCaptcha釋出了！為何要開發RedisCaptcha？之所以會寫RedisCaptcha主要是因為之前使用的simple-captcha是用SQL去處理，需要額外做migrate，加上SQL本身沒有自動expire的功能，搞的行為非常奇怪，還有本身很多先天性的限制(view)，所以乾脆自己用ImageMagick搭配Redis寫了一個！原理簡單的說明一下原理，有興趣的朋友可以看一下source code，沒寫太多難懂的東西 :) 產生Captcha 1. 讀取頁面前產生一個session[:captcha_key]，接著發送一個Request到 /captcha 。 2. 判斷session是否被lock，若無則繼續，反之Response nothing。 3. 產生一個Captcha，把string用session[:captcha_key]當key存到Redis，並且設定expired_time。同時，也設定locked_times和locked_time確保短時間內單一使用者不會大量產生資料。 4. 吐captcha給瀏覽器。 ps: 單一使用者同一時間只會有一張圖，沒有session無法產生圖片。送出Captcha 檢查Redis，看送出的值和當初產生captcha的值是否相同。安裝請看README 參數設定 RedisCaptcha.setup do |config| # ==> Redis configuration config.redis_config = { :host => "127.0.0.1", :port … 繼續閱讀 →

原文地址：[ Ruby on Rails ] 簡單好用的驗證碼Gem – Redis Captcha, 感谢原作者分享。

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