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help_controller.rb 2.49 KB
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class HelpController < ApplicationController
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  skip_before_action :authenticate_user!, :reject_blocked

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  layout 'help'
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  def index
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    @help_index = File.read(Rails.root.join('doc', 'README.md'))
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    # Prefix Markdown links with `help/` unless they already have been
    # See http://rubular.com/r/nwwhzH6Z8X
    @help_index.gsub!(/(\]\()(?!help\/)([^\)\(]+)(\))/, '\1help/\2\3')
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  end
Dmitriy Zaporozhets committed
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  def show
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    @category = clean_path_info(path_params[:category])
    @file = path_params[:file]
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    respond_to do |format|
      format.any(:markdown, :md, :html) do
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        # Note: We are purposefully NOT using `Rails.root.join`
        path = File.join(Rails.root, 'doc', @category, "#{@file}.md")
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        if File.exist?(path)
          @markdown = File.read(path)

          render 'show.html.haml'
        else
          # Force template to Haml
          render 'errors/not_found.html.haml', layout: 'errors', status: 404
        end
      end

      # Allow access to images in the doc folder
      format.any(:png, :gif, :jpeg) do
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        # Note: We are purposefully NOT using `Rails.root.join`
        path = File.join(Rails.root, 'doc', @category, "#{@file}.#{params[:format]}")
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        if File.exist?(path)
          send_file(path, disposition: 'inline')
        else
          head :not_found
        end
      end

      # Any other format we don't recognize, just respond 404
      format.any { head :not_found }
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    end
  end

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  def shortcuts
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  end
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  def ui
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    @user = User.new(id: 0, name: 'John Doe', username: '@johndoe')
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  end
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  private

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  def path_params
    params.require(:category)
    params.require(:file)

    params
  end

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  PATH_SEPS = Regexp.union(*[::File::SEPARATOR, ::File::ALT_SEPARATOR].compact)

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  # Taken from ActionDispatch::FileHandler
  # Cleans up the path, to prevent directory traversal outside the doc folder.
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  def clean_path_info(path_info)
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    parts = path_info.split(PATH_SEPS)
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    clean = []

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    # Walk over each part of the path
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    parts.each do |part|
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      # Turn `one//two` or `one/./two` into `one/two`.
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      next if part.empty? || part == '.'
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      if part == '..'
        # Turn `one/two/../` into `one`
        clean.pop
      else
        # Add simple folder names to the clean path.
        clean << part
      end
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    end

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    # If the path was an absolute path (i.e. `/` or `/one/two`),
    # add `/` to the front of the clean path.
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    clean.unshift '/' if parts.empty? || parts.first.empty?

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    # Join all the clean path parts by the path separator.
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    ::File.join(*clean)
  end
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end