cinic2003/rucaptcha-api

#1
This is a Captcha gem for Rails Applications which generates captcha image by C code.

Example
1635511923591.png

Feature
  • No dependencies. No ImageMagick. No RMagick;
  • For Rails Application;
  • Simple, Easy to use;
  • High performance.
Usage
Put rucaptcha in your Gemfile:

gem 'rucaptcha-api'

Create config/initializers/rucaptcha.rb

Code:
RuCaptcha.configure do
  # Color style, default: :colorful, allows: [:colorful, :black_white]
  # self.style = :colorful
  # Custom captcha code expire time if you need, default: 2 minutes
  # self.expires_in = 120
  # [Requirement / 重要]
  # Store Captcha code where, this config more like Rails config.cache_store
  # default: Read config info from `Rails.application.config.cache_store`
  # But RuCaptcha requirements cache_store not in [:null_store, :memory_store, :file_store]
  # 默认:会从 Rails 配置的 cache_store 里面读取相同的配置信息,并尝试用可以运行的方式,用于存储验证码字符
  # 但如果是 [:null_store, :memory_store, :file_store] 之类的,你可以通过下面的配置项单独给 RuCaptcha 配置 cache_store
  self.cache_store = :mem_cache_store
  # 如果想要 disable cache_store 的 warning,就设置为 true,default false
  # self.skip_cache_store_check = true
  # Chars length, default: 5, allows: [3 - 7]
  # self.length = 5
  # enable/disable Strikethrough.
  # self.strikethrough = true
  # enable/disable Outline style
  # self.outline = false
end
Controller app/controller/account_controller.rb

When you called verify_rucaptcha?, it uses value from params[:_rucaptcha] to validate.

Code:
class AccountController < ApplicationController
  def create
    @user = User.new(params[:user])
    if verify_rucaptcha?(@user) && @user.save
      redirect_to root_path, notice: 'Sign up successed.'
    else
      render 'account/new'
    end
  end
end

class ForgotPasswordController < ApplicationController
  def create
    # without any args
    if verify_rucaptcha?
      to_send_email
    else
      redirect_to '/forgot-password', alert: 'Invalid captcha code.'
    end
  end
end
TIP: Sometimes you may need to keep last verified captcha code in session on verify_rucaptcha? method call, you can use keep_session: true. For example: verify_rucaptcha? @user, keep_session: true.​
View app/views/account/new.html.erb

Code:
<form method="POST">
  ...
  <div class="form-group">
    <%= rucaptcha_input_tag(class: 'form-control', placeholder: 'Input Captcha') %>
    <%= rucaptcha_image_tag(alt: 'Captcha') %>
  </div>
  ...

  <div class="form-group">
    <button type="submit" class="btn btn-primary">Submit</button>
  </div>
</form>
And if you are using Devise, you can read this reference to add validation: RuCaptcha with Devise.
Documentation https://githubmemory.com/repo/cinic2003/rucaptcha-api