1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
class HelpController < ApplicationController
layout 'help'
def index
end
def show
@category = clean_path_info(path_params[:category])
@file = path_params[:file]
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', @category, "#{@file}.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) do
# Note: We are purposefully NOT using `Rails.root.join`
path = File.join(Rails.root, 'doc', @category, "#{@file}.#{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
end
private
def path_params
params.require(:category)
params.require(:file)
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
|