Commit 5e2f25c3 authored by Douwe Maan's avatar Douwe Maan

Add explanation to HelpController#clean_path_info.

parent 988b7035
......@@ -37,21 +37,34 @@ class HelpController < ApplicationController
def ui
end
# Taken from ActionDispatch::FileHandler
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
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 == '.'
part == '..' ? clean.pop : clean << 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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