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Merge the prerequisites for on-by-default XSS escaping into rails.
This consists of: * String#html_safe! a method to mark a string as 'safe' * ActionView::SafeBuffer a string subclass which escapes anything unsafe which is concatenated to it * Calls to String#html_safe! throughout the rails helpers * a 'raw' helper which lets you concatenate trusted HTML from non-safety-aware sources (e.g. presantized strings in the DB) Note, this does *not* give you on-by-default XSS escaping in 2.3 applications. To get that you'll need to install a plugin: http://github.com/nzkoz/rails_xss
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,9 @@ | ||
module ActionView #:nodoc: | ||
module Helpers #:nodoc: | ||
module RawOutputHelper | ||
def raw(stringish) | ||
stringish.to_s.html_safe! | ||
end | ||
end | ||
end | ||
end |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,28 @@ | ||
|
||
module ActionView #:nodoc: | ||
class SafeBuffer < String | ||
def <<(value) | ||
if value.html_safe? | ||
super(value) | ||
else | ||
super(ERB::Util.h(value)) | ||
end | ||
end | ||
|
||
def concat(value) | ||
self << value | ||
end | ||
|
||
def html_safe? | ||
true | ||
end | ||
|
||
def html_safe! | ||
self | ||
end | ||
|
||
def to_s | ||
self | ||
end | ||
end | ||
end |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,21 @@ | ||
require 'abstract_unit' | ||
require 'testing_sandbox' | ||
|
||
class RawOutputHelperTest < ActionView::TestCase | ||
tests ActionView::Helpers::RawOutputHelper | ||
include TestingSandbox | ||
|
||
def setup | ||
@string = "hello" | ||
end | ||
|
||
test "raw returns the safe string" do | ||
result = raw(@string) | ||
assert_equal @string, result | ||
assert result.html_safe? | ||
end | ||
|
||
test "raw handles nil values correctly" do | ||
assert_equal "", raw(nil) | ||
end | ||
end |
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