[ Ruby on Rails ] 簡單好用的驗證碼Gem – Redis Captcha
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ImageM
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![[ Ruby on Rails ] 簡單好用的驗證碼Gem – Redis Captcha](/static/imghw/default1.png)
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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