Class: Jekyll::AssetImg

Inherits:
Liquid::Tag
  • Object
show all
Defined in:
lib/ext.rb

Instance Method Summary collapse

Constructor Details

#initialize(tag_name, text, tokens) ⇒ AssetImg

Returns a new instance of AssetImg.



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# File 'lib/ext.rb', line 31

def initialize(tag_name, text, tokens)
  arr =  text.strip.split(" ")
  @img_name = arr[0]
  @img_width = nil
  if arr.count > 1
    @img_width = arr[1]
  end
end

Instance Method Details

#guess_image_mime_by_base64(base64_str) ⇒ Object 



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# File 'lib/ext.rb', line 40

def guess_image_mime_by_base64(base64_str)
  prefix = base64_str[0, 15]  # 取前 15 个字符足够判断

  case
  when prefix.start_with?('/9j/')
    'image/jpeg'
  when prefix.start_with?('iVBOR')
    'image/png'
  when prefix.start_with?('R0lGODdh', 'R0lGODlh')
    'image/gif'
  when prefix.start_with?('UklGR')
    'image/webp'
  else
    'image/png'
  end
end

#render(context) ⇒ Object 



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# File 'lib/ext.rb', line 58

def render(context)
  path = context['page']['path']
  

  dirPath0 = path[0...(path.length - 3)]
  pathComponent = dirPath0.split("/")
  dirPath = pathComponent[-1]
  
  base = $g_config['baseurl']
  link = "/pics/#{dirPath}/#{@img_name}"
  if base && base.length
    link = "#{base}/pics/#{dirPath}/#{@img_name}"
  end 

  enc = EncFilterClass.new
  encid = enc.get_encrypt_id('',context['page'])
  if !encid.nil? && encid.length > 0
    begin
      file = File.open(File.expand_path("pics/#{dirPath}/#{@img_name}"))
      b64 = Base64.strict_encode64 file.read()
      link =  "data:image/#{guess_image_mime_by_base64(b64)};base64," + b64  
      puts "Encrypt img #{"pics/#{dirPath}/#{@img_name}"}"
    rescue => exception
      puts "\n----------------------------"
      puts exception

      puts "\nEncrypt img #{"pics/#{dirPath}/#{@img_name}"} Fail"
      puts "----------------------------"
      
      link = 'ERROR '
    end
    
    


    
  else
  end
  

  if @img_width != nil
    return "<img src='#{link}' style='width:#{@img_width}px'>"
  else
    return "![](#{link})" 
  end

  
end