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require 'erb'
require 'active_support/core_ext/kernel/singleton_class'
class ERB
module Util
HTML_ESCAPE = { '&' => '&', '>' => '>', '<' => '<', '"' => '"' }
JSON_ESCAPE = { '&' => '\u0026', '>' => '\u003E', '<' => '\u003C' }
# A utility method for escaping HTML tag characters.
# This method is also aliased as <tt>h</tt>.
#
# In your ERB templates, use this method to escape any unsafe content. For example:
# <%=h @person.name %>
#
# ==== Example:
# puts html_escape("is a > 0 & a < 10?")
# # => is a > 0 & a < 10?
def html_escape(s)
s = s.to_s
if s.html_safe?
s
else
s.gsub(/[&"><]/) { |special| HTML_ESCAPE[special] }.html_safe
end
end
# Aliasing twice issues a warning "discarding old...". Remove first to avoid it.
remove_method(:h)
alias h html_escape
module_function :h
singleton_class.send(:remove_method, :html_escape)
module_function :html_escape
# A utility method for escaping HTML entities in JSON strings
# using \uXXXX JavaScript escape sequences for string literals:
#
# json_escape("is a > 0 & a < 10?")
# # => is a \u003E 0 \u0026 a \u003C 10?
#
# Note that after this operation is performed the output is not
# valid JSON. In particular double quotes are removed:
#
# json_escape('{"name":"john","created_at":"2010-04-28T01:39:31Z","id":1}')
# # => {name:john,created_at:2010-04-28T01:39:31Z,id:1}
#
# This method is also aliased as +j+, and available as a helper
# in Rails templates:
#
# <%=j @person.to_json %>
#
def json_escape(s)
s.to_s.gsub(/[&"><]/) { |special| JSON_ESCAPE[special] }
end
alias j json_escape
module_function :j
module_function :json_escape
end
end
class Object
def html_safe?
false
end
end
class Fixnum
def html_safe?
true
end
end
module ActiveSupport #:nodoc:
class SafeBuffer < String
UNSAFE_STRING_METHODS = ["capitalize", "chomp", "chop", "delete", "downcase", "gsub", "lstrip", "next", "reverse", "rstrip", "slice", "squeeze", "strip", "sub", "succ", "swapcase", "tr", "tr_s", "upcase"].freeze
alias safe_concat concat
def concat(value)
if value.html_safe?
super(value)
else
super(ERB::Util.h(value))
end
end
alias << concat
def +(other)
dup.concat(other)
end
def html_safe?
true
end
def html_safe
self
end
def to_s
self
end
def encode_with(coder)
coder.represent_scalar nil, to_str
end
def to_yaml(*args)
return super() if defined?(YAML::ENGINE) && !YAML::ENGINE.syck?
to_str.to_yaml(*args)
end
for unsafe_method in UNSAFE_STRING_METHODS
class_eval <<-EOT, __FILE__, __LINE__
def #{unsafe_method}(*args)
super.to_str
end
def #{unsafe_method}!(*args)
raise TypeError, "Cannot modify SafeBuffer in place"
end
EOT
end
end
end
class String
def html_safe!
raise "You can't call html_safe! on a String"
end
def html_safe
ActiveSupport::SafeBuffer.new(self)
end
end
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