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module ActiveRecord
module Sanitization
extend ActiveSupport::Concern
module ClassMethods
# Used to sanitize objects before they're used in an SQL SELECT statement. Delegates to <tt>connection.quote</tt>.
def sanitize(object) #:nodoc:
connection.quote(object)
end
alias_method :quote_value, :sanitize
protected
# Accepts an array or string of SQL conditions and sanitizes
# them into a valid SQL fragment for a WHERE clause.
# ["name='%s' and group_id='%s'", "foo'bar", 4] returns "name='foo''bar' and group_id='4'"
# "name='foo''bar' and group_id='4'" returns "name='foo''bar' and group_id='4'"
def sanitize_sql_for_conditions(condition, table_name = self.table_name)
return nil if condition.blank?
case condition
when Array; sanitize_sql_array(condition)
else condition
end
end
alias_method :sanitize_sql, :sanitize_sql_for_conditions
alias_method :sanitize_conditions, :sanitize_sql
# Accepts an array, hash, or string of SQL conditions and sanitizes
# them into a valid SQL fragment for a SET clause.
# { name: nil, group_id: 4 } returns "name = NULL , group_id='4'"
def sanitize_sql_for_assignment(assignments, default_table_name = self.table_name)
case assignments
when Array; sanitize_sql_array(assignments)
when Hash; sanitize_sql_hash_for_assignment(assignments, default_table_name)
else assignments
end
end
# Accepts a hash of SQL conditions and replaces those attributes
# that correspond to a +composed_of+ relationship with their expanded
# aggregate attribute values.
# Given:
# class Person < ActiveRecord::Base
# composed_of :address, class_name: "Address",
# mapping: [%w(address_street street), %w(address_city city)]
# end
# Then:
# { address: Address.new("813 abc st.", "chicago") }
# # => { address_street: "813 abc st.", address_city: "chicago" }
def expand_hash_conditions_for_aggregates(attrs)
expanded_attrs = {}
attrs.each do |attr, value|
if aggregation = reflect_on_aggregation(attr.to_sym)
mapping = aggregation.mapping
mapping.each do |field_attr, aggregate_attr|
if mapping.size == 1 && !value.respond_to?(aggregate_attr)
expanded_attrs[field_attr] = value
else
expanded_attrs[field_attr] = value.send(aggregate_attr)
end
end
else
expanded_attrs[attr] = value
end
end
expanded_attrs
end
# Sanitizes a hash of attribute/value pairs into SQL conditions for a SET clause.
# { status: nil, group_id: 1 }
# # => "status = NULL , group_id = 1"
def sanitize_sql_hash_for_assignment(attrs, table)
c = connection
attrs.map do |attr, value|
value = type_for_attribute(attr.to_s).serialize(value)
"#{c.quote_table_name_for_assignment(table, attr)} = #{c.quote(value)}"
end.join(', ')
end
# Sanitizes a +string+ so that it is safe to use within an SQL
# LIKE statement. This method uses +escape_character+ to escape all occurrences of "\", "_" and "%"
def sanitize_sql_like(string, escape_character = "\\")
pattern = Regexp.union(escape_character, "%", "_")
string.gsub(pattern) { |x| [escape_character, x].join }
end
# Accepts an array of conditions. The array has each value
# sanitized and interpolated into the SQL statement.
# ["name='%s' and group_id='%s'", "foo'bar", 4] returns "name='foo''bar' and group_id='4'"
def sanitize_sql_array(ary)
statement, *values = ary
if values.first.is_a?(Hash) && statement =~ /:\w+/
replace_named_bind_variables(statement, values.first)
elsif statement.include?('?')
replace_bind_variables(statement, values)
elsif statement.blank?
statement
else
statement % values.collect { |value| connection.quote_string(value.to_s) }
end
end
def replace_bind_variables(statement, values) #:nodoc:
raise_if_bind_arity_mismatch(statement, statement.count('?'), values.size)
bound = values.dup
c = connection
statement.gsub(/\?/) do
replace_bind_variable(bound.shift, c)
end
end
def replace_bind_variable(value, c = connection) #:nodoc:
if ActiveRecord::Relation === value
value.to_sql
else
quote_bound_value(value, c)
end
end
def replace_named_bind_variables(statement, bind_vars) #:nodoc:
statement.gsub(/(:?):([a-zA-Z]\w*)/) do
if $1 == ':' # skip postgresql casts
$& # return the whole match
elsif bind_vars.include?(match = $2.to_sym)
replace_bind_variable(bind_vars[match])
else
raise PreparedStatementInvalid, "missing value for :#{match} in #{statement}"
end
end
end
def quote_bound_value(value, c = connection) #:nodoc:
if value.respond_to?(:map) && !value.acts_like?(:string)
if value.respond_to?(:empty?) && value.empty?
c.quote(nil)
else
value.map { |v| c.quote(v) }.join(',')
end
else
c.quote(value)
end
end
def raise_if_bind_arity_mismatch(statement, expected, provided) #:nodoc:
unless expected == provided
raise PreparedStatementInvalid, "wrong number of bind variables (#{provided} for #{expected}) in: #{statement}"
end
end
end
# TODO: Deprecate this
def quoted_id
self.class.quote_value(@attributes[self.class.primary_key].value_for_database)
end
end
end
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