89 lines
2.1 KiB
Ruby
89 lines
2.1 KiB
Ruby
class HelpController < ApplicationController
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layout 'help'
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def index
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end
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def show
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@category = clean_path_info(path_params[:category])
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@file = path_params[:file]
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respond_to do |format|
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format.any(:markdown, :md, :html) do
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# Note: We are purposefully NOT using `Rails.root.join`
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path = File.join(Rails.root, 'doc', @category, "#{@file}.md")
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if File.exist?(path)
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@markdown = File.read(path)
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render 'show.html.haml'
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else
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# Force template to Haml
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render 'errors/not_found.html.haml', layout: 'errors', status: 404
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end
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end
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# Allow access to images in the doc folder
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format.any(:png, :gif, :jpeg) do
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# Note: We are purposefully NOT using `Rails.root.join`
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path = File.join(Rails.root, 'doc', @category, "#{@file}.#{params[:format]}")
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if File.exist?(path)
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send_file(path, disposition: 'inline')
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else
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head :not_found
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end
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end
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# Any other format we don't recognize, just respond 404
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format.any { head :not_found }
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end
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end
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def shortcuts
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end
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def ui
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end
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private
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def path_params
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params.require(:category)
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params.require(:file)
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params
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end
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PATH_SEPS = Regexp.union(*[::File::SEPARATOR, ::File::ALT_SEPARATOR].compact)
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# Taken from ActionDispatch::FileHandler
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# 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 == '..'
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# Turn `one/two/../` into `one`
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clean.pop
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else
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# Add simple folder names to the clean path.
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clean << part
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end
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end
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# If the path was an absolute path (i.e. `/` or `/one/two`),
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# 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)
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end
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end
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