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
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
require 'active_support/core_ext/class/attribute'
require 'active_support/deprecation'
require 'loofah'
module ActionView
class FullSanitizer
def sanitize(html, options = {})
Loofah.fragment(html).text
end
end
class LinkSanitizer
def initialize
@link_scrubber = Loofah::Scrubber.new do |node|
next unless node.name == 'a'
node.before node.children
node.remove
end
end
def sanitize(html, options = {})
Loofah.scrub_fragment(html, @link_scrubber).to_s
end
end
class WhiteListSanitizer
def sanitize(html, options = {})
return nil unless html
validate_options(options)
loofah_fragment = Loofah.fragment(html)
loofah_fragment.scrub!(:strip)
loofah_fragment.xpath("./form").each { |form| form.remove }
loofah_fragment.to_s
end
def sanitize_css(style_string)
Loofah::HTML5::Scrub.scrub_css style_string
end
def protocol_separator
ActiveSupport::Deprecation.warn('protocol_separator has been deprecated and has no effect.')
end
def protocol_separator=(value)
ActiveSupport::Deprecation.warn('protocol_separator= has been deprecated and has no effect.')
end
def bad_tags
ActiveSupport::Deprecation.warn('bad_tags has been deprecated and has no effect.')
end
class << self
def protocol_separator
ActiveSupport::Deprecation.warn('protocol_separator has been deprecated and has no effect.')
end
def protocol_separator=(value)
ActiveSupport::Deprecation.warn('protocol_separator= has been deprecated and has no effect.')
end
def bad_tags
ActiveSupport::Deprecation.warn('The bad_tags class attribute has been deprecated and has no effect. You can still affect the tags being sanitized using bad_tags= which changes the allowed_tags.')
end
def bad_tags=(tags)
allowed_tags.replace(allowed_tags - tags)
end
end
[:uri_attributes, :allowed_attributes,
:allowed_tags, :allowed_protocols, :allowed_css_properties,
:allowed_css_keywords, :shorthand_css_properties].each do |attr|
class_attribute attr, :instance_writer => false
define_method "#{self}.update_#{attr}" do |arg|
attr.merge arg
end
end
# Constants are from Loofahs source at lib/loofah/html5/whitelist.rb
self.uri_attributes = Loofah::HTML5::WhiteList::ATTR_VAL_IS_URI
self.allowed_tags = Loofah::HTML5::WhiteList::ALLOWED_ELEMENTS
self.bad_tags = Set.new %w(script)
self.allowed_attributes = Loofah::HTML5::WhiteList::ALLOWED_ATTRIBUTES
self.allowed_css_properties = Loofah::HTML5::WhiteList::ALLOWED_CSS_PROPERTIES
self.allowed_css_keywords = Loofah::HTML5::WhiteList::ALLOWED_CSS_KEYWORDS
self.shorthand_css_properties = Loofah::HTML5::WhiteList::SHORTHAND_CSS_PROPERTIES
self.allowed_protocols = Loofah::HTML5::WhiteList::ALLOWED_PROTOCOLS
protected
def validate_options(options)
if options[:tags] && !options[:tags].is_a?(Enumerable)
raise ArgumentError, "You should pass :tags as an Enumerable"
end
if options[:attributes] && !options[:attributes].is_a?(Enumerable)
raise ArgumentError, "You should pass :attributes as an Enumerable"
end
end
def contains_bad_protocols?(attr_name, value)
protocol_separator = ':'
self.uri_attributes.include?(attr_name) &&
(value =~ /(^[^\/:]*):|(�*58)|(p)|(�*3a)|(%|%)3A/i && !self.allowed_protocols.include?(value.split(protocol_separator).first.downcase.strip))
end
end
end
|
