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class HelpController < ApplicationController
skip_before_action :authenticate_user!, :reject_blocked!
layout 'help'
def index
@help_index = File.read(Rails.root.join('doc', 'README.md'))
# Prefix Markdown links with `help/` unless they are external links
# See http://rubular.com/r/MioSrVLK3S
@help_index.gsub!(%r{(\]\()(?!.+://)([^\)\(]+\))}, '\1/help/\2')
end
def show
@path = clean_path_info(path_params[:path])
respond_to do |format|
format.any(:markdown, :md, :html) do
# Note: We are purposefully NOT using `Rails.root.join`
path = File.join(Rails.root, 'doc', "#{@path}.md")
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, :mp4) do
# Note: We are purposefully NOT using `Rails.root.join`
path = File.join(Rails.root, 'doc', "#{@path}.#{params[:format]}")
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 }
end
end
def shortcuts
end
def ui
@user = User.new(id: 0, name: 'John Doe', username: '@johndoe')
end
private
def path_params
params.require(:path)
params
end
PATH_SEPS = Regexp.union(*[::File::SEPARATOR, ::File::ALT_SEPARATOR].compact)
# Taken from ActionDispatch::FileHandler
# Cleans up the path, to prevent directory traversal outside the doc folder.
def clean_path_info(path_info)
parts = path_info.split(PATH_SEPS)
clean = []
# Walk over each part of the path
parts.each do |part|
# Turn `one//two` or `one/./two` into `one/two`.
next if part.empty? || part == '.'
if part == '..'
# Turn `one/two/../` into `one`
clean.pop
else
# Add simple folder names to the clean path.
clean << part
end
end
# If the path was an absolute path (i.e. `/` or `/one/two`),
# add `/` to the front of the clean path.
clean.unshift '/' if parts.empty? || parts.first.empty?
# Join all the clean path parts by the path separator.
::File.join(*clean)
end
end
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