feat: custom address/date parser based on rfc5322 abnf

pkg/message/rfc5322/date_time.go

@@ -0,0 +1,79 @@
+// Copyright (c) 2020 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+package rfc5322
+
+import (
+	"time"
+
+	"github.com/ProtonMail/proton-bridge/pkg/message/rfc5322/parser"
+	"github.com/sirupsen/logrus"
+)
+
+type dateTime struct {
+	day   int
+	month time.Month
+	year  int
+
+	hour, min, sec int
+
+	loc *time.Location
+}
+
+func (dt *dateTime) withDay(day *day) {
+	dt.day = day.value
+}
+
+func (dt *dateTime) withMonth(month *month) {
+	dt.month = month.value
+}
+
+func (dt *dateTime) withYear(year *year) {
+	dt.year = year.value
+}
+
+func (dt *dateTime) withHour(hour *hour) {
+	dt.hour = hour.value
+}
+
+func (dt *dateTime) withMinute(minute *minute) {
+	dt.min = minute.value
+}
+
+func (dt *dateTime) withSecond(second *second) {
+	dt.sec = second.value
+}
+
+func (dt *dateTime) withZone(zone *zone) {
+	dt.loc = zone.location
+}
+
+func (w *walker) EnterDateTime(ctx *parser.DateTimeContext) {
+	logrus.WithField("text", ctx.GetText()).Trace("Entering dateTime")
+
+	w.enter(&dateTime{
+		loc: time.UTC,
+	})
+}
+
+func (w *walker) ExitDateTime(ctx *parser.DateTimeContext) {
+	logrus.WithField("text", ctx.GetText()).Trace("Exiting dateTime")
+
+	dt := w.exit().(*dateTime)
+
+	w.res = time.Date(dt.year, dt.month, dt.day, dt.hour, dt.min, dt.sec, 0, dt.loc)
+}