Class: Jsonview::Middleware

Inherits:
Object
  • Object
show all
Defined in:
lib/jsonview/middleware.rb

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Middleware

Returns a new instance of Middleware.



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# File 'lib/jsonview/middleware.rb', line 3

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/jsonview/middleware.rb', line 7

def call(env)
  response = @app.call(env)
  accept = env['HTTP_ACCEPT'] || ''

  if accept =~ /html/ && !(accept =~ /json/)
    status, headers, body = response
    content_type = headers['Content-Type'] || ''

    if content_type =~ /json/
      json = body.to_enum(:each).to_a.join
      html = html_document(JSON.parse(json))
      headers['Content-Type'] = "text/html;charset=utf-8"
      headers['Content-Length'] = html.bytesize.to_s
      response = [status, headers, [html]]
    end
  end

  response
end

#encode(string) ⇒ Object 



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# File 'lib/jsonview/middleware.rb', line 104

def encode(string)
  string.gsub /[<>&"]/, '<' => '&lt;', '>' => '&gt;', '&' => '&amp;', '"' => '\&quot;'
end

#html_document(value) ⇒ Object 



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# File 'lib/jsonview/middleware.rb', line 27

def html_document(value)
  <<-HTML
    <!DOCTYPE html>
    <html>
      <head>
        <style>
          null { color: red }
          string { color: green }
          number, boolean { color: blue }
          unknown { color: gray }
          hash, array { display: block; margin-left: 2em }
          key { font-weight: bold }
        </style>
      </head>
      <body>
        #{represent(value).join}
      </body>
    </html>
  HTML
end

#represent(value) ⇒ Object 



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# File 'lib/jsonview/middleware.rb', line 48

def represent(value)
  case value
  when nil
    "<null>null</null>"
  when Numeric
    "<number>#{value}</number>"
  when TrueClass, FalseClass
    "<boolean>#{value}</boolean>"
  when Array
    [
      "[<array>\n",
      value.each_with_index.map do |v, i|
        [
          (",<br/>\n" if i > 0),
          represent(v),
        ]
      end,
      "\n</array>]",
    ]
  when Hash
    [
      "{<hash>\n",
      value.each_with_index.map do |(k, v), i|
        [
          (",<br/>\n" if i > 0),
          "<key>&quot;",
          encode(k.to_s),
          "&quot;</key>: ",
          represent(v),
        ]
      end,
      "\n</hash>}",
    ]
  when URI.regexp(%w[http https])
    [
      "&quot;<a href=\"",
      encode(value),
      "\">",
      encode(value),
      "</a>&quot;",
    ]
  when String
    [
      "<string>&quot;",
      encode(value),
      "&quot;</string>",
    ]
  else
    [
      "<unknown>&quot;",
      encode(value.inspect),
      "&quot;</unknown>",
    ]
  end
end