1 files changed, 168 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb b/activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb
new file mode 100644
index 0000000000..0895d06356
--- /dev/null
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb
@@ -0,0 +1,168 @@
+# frozen_string_literal: true
+
+module ActiveRecord
+  module ConnectionAdapters
+    module PostgreSQL
+      module Quoting
+        # Escapes binary strings for bytea input to the database.
+        def escape_bytea(value)
+          @connection.escape_bytea(value) if value
+        end
+
+        # Unescapes bytea output from a database to the binary string it represents.
+        # NOTE: This is NOT an inverse of escape_bytea! This is only to be used
+        # on escaped binary output from database drive.
+        def unescape_bytea(value)
+          @connection.unescape_bytea(value) if value
+        end
+
+        # Quotes strings for use in SQL input.
+        def quote_string(s) #:nodoc:
+          @connection.escape(s)
+        end
+
+        # Checks the following cases:
+        #
+        # - table_name
+        # - "table.name"
+        # - schema_name.table_name
+        # - schema_name."table.name"
+        # - "schema.name".table_name
+        # - "schema.name"."table.name"
+        def quote_table_name(name) # :nodoc:
+          @quoted_table_names[name] ||= Utils.extract_schema_qualified_name(name.to_s).quoted.freeze
+        end
+
+        # Quotes schema names for use in SQL queries.
+        def quote_schema_name(name)
+          PG::Connection.quote_ident(name)
+        end
+
+        def quote_table_name_for_assignment(table, attr)
+          quote_column_name(attr)
+        end
+
+        # Quotes column names for use in SQL queries.
+        def quote_column_name(name) # :nodoc:
+          @quoted_column_names[name] ||= PG::Connection.quote_ident(super).freeze
+        end
+
+        # Quote date/time values for use in SQL input.
+        def quoted_date(value) #:nodoc:
+          if value.year <= 0
+            bce_year = format("%04d", -value.year + 1)
+            super.sub(/^-?\d+/, bce_year) + " BC"
+          else
+            super
+          end
+        end
+
+        def quoted_binary(value) # :nodoc:
+          "'#{escape_bytea(value.to_s)}'"
+        end
+
+        def quote_default_expression(value, column) # :nodoc:
+          if value.is_a?(Proc)
+            value.call
+          elsif column.type == :uuid && value.is_a?(String) && /\(\)/.match?(value)
+            value # Does not quote function default values for UUID columns
+          elsif column.respond_to?(:array?)
+            value = type_cast_from_column(column, value)
+            quote(value)
+          else
+            super
+          end
+        end
+
+        def lookup_cast_type_from_column(column) # :nodoc:
+          type_map.lookup(column.oid, column.fmod, column.sql_type)
+        end
+
+        private
+          def lookup_cast_type(sql_type)
+            super(query_value("SELECT #{quote(sql_type)}::regtype::oid", "SCHEMA").to_i)
+          end
+
+          def _quote(value)
+            case value
+            when OID::Xml::Data
+              "xml '#{quote_string(value.to_s)}'"
+            when OID::Bit::Data
+              if value.binary?
+                "B'#{value}'"
+              elsif value.hex?
+                "X'#{value}'"
+              end
+            when Numeric
+              if value.finite?
+                super
+              else
+                "'#{value}'"
+              end
+            when OID::Array::Data
+              _quote(encode_array(value))
+            when Range
+              _quote(encode_range(value))
+            else
+              super
+            end
+          end
+
+          def _type_cast(value)
+            case value
+            when Type::Binary::Data
+              # Return a bind param hash with format as binary.
+              # See https://deveiate.org/code/pg/PG/Connection.html#method-i-exec_prepared-doc
+              # for more information
+              { value: value.to_s, format: 1 }
+            when OID::Xml::Data, OID::Bit::Data
+              value.to_s
+            when OID::Array::Data
+              encode_array(value)
+            when Range
+              encode_range(value)
+            else
+              super
+            end
+          end
+
+          def encode_array(array_data)
+            encoder = array_data.encoder
+            values = type_cast_array(array_data.values)
+
+            result = encoder.encode(values)
+            if encoding = determine_encoding_of_strings_in_array(values)
+              result.force_encoding(encoding)
+            end
+            result
+          end
+
+          def encode_range(range)
+            "[#{type_cast_range_value(range.first)},#{type_cast_range_value(range.last)}#{range.exclude_end? ? ')' : ']'}"
+          end
+
+          def determine_encoding_of_strings_in_array(value)
+            case value
+            when ::Array then determine_encoding_of_strings_in_array(value.first)
+            when ::String then value.encoding
+            end
+          end
+
+          def type_cast_array(values)
+            case values
+            when ::Array then values.map { |item| type_cast_array(item) }
+            else _type_cast(values)
+            end
+          end
+
+          def type_cast_range_value(value)
+            infinity?(value) ? "" : type_cast(value)
+          end
+
+          def infinity?(value)
+            value.respond_to?(:infinite?) && value.infinite?
+          end
+      end
+    end
+  end
+end