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require "active_support/core_ext/big_decimal/conversions"
module ActiveRecord
module ConnectionAdapters # :nodoc:
module Quoting
# Quotes the column value to help prevent
# {SQL injection attacks}[http://en.wikipedia.org/wiki/SQL_injection].
def quote(value, column = nil)
# records are quoted as their primary key
return value.quoted_id if value.respond_to?(:quoted_id)
if column
ActiveSupport::Deprecation.warn(<<-MSG.squish)
Passing a column to `quote` has been deprecated. It is only used
for type casting, which should be handled elsewhere. See
https://github.com/rails/arel/commit/6160bfbda1d1781c3b08a33ec4955f170e95be11
for more information.
MSG
value = type_cast_from_column(column, value)
end
_quote(value)
end
# Cast a +value+ to a type that the database understands. For example,
# SQLite does not understand dates, so this method will convert a Date
# to a String.
def type_cast(value, column = nil)
if value.respond_to?(:quoted_id) && value.respond_to?(:id)
return value.id
end
if column
value = type_cast_from_column(column, value)
end
_type_cast(value)
rescue TypeError
to_type = column ? " to #{column.type}" : ""
raise TypeError, "can't cast #{value.class}#{to_type}"
end
# If you are having to call this function, you are likely doing something
# wrong. The column does not have sufficient type information if the user
# provided a custom type on the class level either explicitly (via
# Attributes::ClassMethods#attribute) or implicitly (via
# AttributeMethods::Serialization::ClassMethods#serialize, +time_zone_aware_attributes+).
# In almost all cases, the sql type should only be used to change quoting behavior, when the primitive to
# represent the type doesn't sufficiently reflect the differences
# (varchar vs binary) for example. The type used to get this primitive
# should have been provided before reaching the connection adapter.
def type_cast_from_column(column, value) # :nodoc:
if column
type = lookup_cast_type_from_column(column)
type.serialize(value)
else
value
end
end
# See docs for #type_cast_from_column
def lookup_cast_type_from_column(column) # :nodoc:
lookup_cast_type(column.sql_type)
end
def fetch_type_metadata(sql_type)
cast_type = lookup_cast_type(sql_type)
SqlTypeMetadata.new(
sql_type: sql_type,
type: cast_type.type,
limit: cast_type.limit,
precision: cast_type.precision,
scale: cast_type.scale,
)
end
# Quotes a string, escaping any ' (single quote) and \ (backslash)
# characters.
def quote_string(s)
s.gsub('\\'.freeze, '\&\&'.freeze).gsub("'".freeze, "''".freeze) # ' (for ruby-mode)
end
# Quotes the column name. Defaults to no quoting.
def quote_column_name(column_name)
column_name.to_s
end
# Quotes the table name. Defaults to column name quoting.
def quote_table_name(table_name)
quote_column_name(table_name)
end
# Override to return the quoted table name for assignment. Defaults to
# table quoting.
#
# This works for mysql2 where table.column can be used to
# resolve ambiguity.
#
# We override this in the sqlite3 and postgresql adapters to use only
# the column name (as per syntax requirements).
def quote_table_name_for_assignment(table, attr)
quote_table_name("#{table}.#{attr}")
end
def quote_default_expression(value, column) # :nodoc:
if value.is_a?(Proc)
value.call
else
value = lookup_cast_type(column.sql_type).serialize(value)
quote(value)
end
end
def quoted_true
"'t'".freeze
end
def unquoted_true
"t".freeze
end
def quoted_false
"'f'".freeze
end
def unquoted_false
"f".freeze
end
# Quote date/time values for use in SQL input. Includes microseconds
# if the value is a Time responding to usec.
def quoted_date(value)
if value.acts_like?(:time)
zone_conversion_method = ActiveRecord::Base.default_timezone == :utc ? :getutc : :getlocal
if value.respond_to?(zone_conversion_method)
value = value.send(zone_conversion_method)
end
end
result = value.to_s(:db)
if value.respond_to?(:usec) && value.usec > 0
"#{result}.#{sprintf("%06d", value.usec)}"
else
result
end
end
def quoted_time(value) # :nodoc:
quoted_date(value).sub(/\A2000-01-01 /, "")
end
private
def type_casted_binds(binds)
binds.map { |attr| type_cast(attr.value_for_database) }
end
def types_which_need_no_typecasting
[nil, Numeric, String]
end
def _quote(value)
case value
when String, ActiveSupport::Multibyte::Chars, Type::Binary::Data
"'#{quote_string(value.to_s)}'"
when true then quoted_true
when false then quoted_false
when nil then "NULL"
# BigDecimals need to be put in a non-normalized form and quoted.
when BigDecimal then value.to_s("F")
when Numeric, ActiveSupport::Duration then value.to_s
when Type::Time::Value then "'#{quoted_time(value)}'"
when Date, Time then "'#{quoted_date(value)}'"
when Symbol then "'#{quote_string(value.to_s)}'"
when Class then "'#{value}'"
else raise TypeError, "can't quote #{value.class.name}"
end
end
def _type_cast(value)
case value
when Symbol, ActiveSupport::Multibyte::Chars, Type::Binary::Data
value.to_s
when true then unquoted_true
when false then unquoted_false
# BigDecimals need to be put in a non-normalized form and quoted.
when BigDecimal then value.to_s("F")
when Type::Time::Value then quoted_time(value)
when Date, Time then quoted_date(value)
when *types_which_need_no_typecasting
value
else raise TypeError
end
end
end
end
end
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