Question

我正在为我的Rails项目寻找更好的文本到图像解决方案来替换我每次创建或更新新记录时使用ImageMagick生成png的当前方法。

我希望防止大量数据泄露和滥用电子邮件地址。我想知道是否有一个API来生成文本或使用javascript，或SVG等。任何缺少Flash。

我正在寻找比现有方法更好的解决方案：

  def create_new_email_image

    if email_changed?

      path_to_images = '/images/emails'

      puts "Connecting to AWS..."
      config = YAML.load(File.open("#{RAILS_ROOT}/config/s3_credentials.yml"))[RAILS_ENV]
      AWS::S3::Base.establish_connection!(
        :access_key_id     => config['access_key_id'],
        :secret_access_key => config['secret_access_key']
      )

      puts "Finding S3 bucket..."
      begin
        bucket = AWS::S3::Bucket.find config['bucket_name']
      rescue AWS::S3::NoSuchBucket
        AWS::S3::Bucket.create config['bucket_name']
        bucket = AWS::S3::Bucket.find config['bucket_name']
      end

      images_path = "#{RAILS_ROOT}/tmp/"
      file_name = "#{id}.png"
      #file_name = "5056.png"
      file_path = images_path + "/"+ file_name

      File.delete file_path if File.exists? file_path

      img = Magick::Image.new(400, 22) { self.background_color = 'transparent' }
      img.format = 'PNG'

      text = Magick::Draw.new
      text.annotate(img, 0, 0, 1, 0, "#{email}") {
          self.gravity = Magick::WestGravity
          self.pointsize = 18
          self.fill = '#000000'
          self.kerning = -1
          self.font_weight = Magick::BoldWeight
          }

      img.write file_path

      if AWS::S3::S3Object.exists? file_name, bucket.name + path_to_images
        puts "file exists (deleting)"
        AWS::S3::S3Object.delete file_name, bucket.name + path_to_images, :force => true
      end

      AWS::S3::S3Object.store file_name, 
         File.open(file_path), 
         bucket.name + path_to_images, 
         :content_type => 'image/png',
         :access => :public_read,
         :reload => true

      `rm #{file_path}`
    end
  end

Answer 1

Rails提供mail_to helper。

mail_to "me@domain.com"
# => <a href="mailto:me@domain.com">me@domain.com</a>

mail_to "me@domain.com", "My email", :encode => "javascript"
# => <script type="text/javascript">eval(decodeURIComponent('%64%6f%63...%27%29%3b'))</script>

mail_to "me@domain.com", "My email", :encode => "hex"
# => <a href="mailto:%6d%65@%64%6f%6d%61%69%6e.%63%6f%6d">My email</a>

mail_to "me@domain.com", nil, :replace_at => "_at_", :replace_dot => "_dot_", :class => "email"
# => <a href="mailto:me@domain.com" class="email">me_at_domain_dot_com</a>

mail_to "me@domain.com", "My email", :cc => "ccaddress@domain.com",
         :subject => "This is an example email"
# => <a href="mailto:me@domain.com?cc=ccaddress@domain.com&subject=This%20is%20an%20example%20email">My email</a>

您正在寻找:encode => "hex"或:encode => "javascript"选项。

Answer 2

我遇到了同样的问题。这是我的解决方案：

def text_to_image(text,options={})
    return if text.blank?
    filename=get_text_file_path(text)
    unless File.exists?(filename)
      gc = Magick::Draw.new
      gc.fill = options[:color] unless options[:color].blank?
      gc.pointsize options[:size] unless options[:size].blank?
      gc.font=options[:font] unless options[:font].blank?
      gc.gravity = Magick::CenterGravity
      gc.text(0,0, text)
      metrics=gc.get_type_metrics(text)
      image = Magick::Image.new(metrics.width, metrics.height){
        self.background_color = 'transparent'
        }
      gc.draw(image)
      image.write(filename)
    end
  end

我使用after_save回调来更新电子邮件属性的图形缓存。

生成电子邮件地址图像或无法轻易删除的内容

2 个答案: