Map event time zones

ATTRIBUTION.md

@@ -48,3 +48,4 @@ FairEmail uses:
 * [Send](https://github.com/timvisee/send). [Mozilla Public License 2.0](https://github.com/timvisee/send/blob/master/LICENSE).
 * [DetectHtml](https://github.com/dbennett455/DetectHtml). [The MIT License](https://github.com/dbennett455/DetectHtml/blob/master/LICENSE).
 * [Liberation Sans Narrow font](https://github.com/liberationfonts/liberation-sans-narrow). Copyright (C) 1989, 1991 Free Software Foundation, Inc. [GNU General Public License version 2 with exceptions](https://fedoraproject.org/wiki/Licensing/LiberationFontLicense).
+* [Evolution/MAPIProvider](https://github.com/GNOME/evolution-mapi/). Copyright (C) 1991, 1999 Free Software Foundation, Inc. [GNU Lesser General Public License, version 2.1](https://github.com/GNOME/evolution-mapi/blob/master/COPYING).

app/src/main/assets/ATTRIBUTION.md

@@ -48,3 +48,4 @@ FairEmail uses:
 * [Send](https://github.com/timvisee/send). [Mozilla Public License 2.0](https://github.com/timvisee/send/blob/master/LICENSE).
 * [DetectHtml](https://github.com/dbennett455/DetectHtml). [The MIT License](https://github.com/dbennett455/DetectHtml/blob/master/LICENSE).
 * [Liberation Sans Narrow font](https://github.com/liberationfonts/liberation-sans-narrow). Copyright (C) 1989, 1991 Free Software Foundation, Inc. [GNU General Public License version 2 with exceptions](https://fedoraproject.org/wiki/Licensing/LiberationFontLicense).
+* [Evolution/MAPIProvider](https://github.com/GNOME/evolution-mapi/). Copyright (C) 1991, 1999 Free Software Foundation, Inc. [GNU Lesser General Public License, version 2.1](https://github.com/GNOME/evolution-mapi/blob/master/COPYING).

app/src/main/assets/tz-mapi-to-ical.txt

@@ -0,0 +1,88 @@
+Dateline Standard Time~~~Pacific/Apia
+Samoa Standard Time~~~Pacific/Midway
+Hawaiian Standard Time~~~Pacific/Honolulu
+Alaskan Standard Time~~~America/Anchorage
+Pacific Standard Time~~~America/Los_Angeles
+Pacific Standard Time (Mexico)~~~America/Tijuana
+US Mountain Standard Time~~~America/Phoenix
+Mountain Standard Time (Mexico)~~~America/Mazatlan
+Mexico Standard Time 2~~~America/Chihuahua
+Mountain Standard Time~~~America/Denver
+Central America Standard Time~~~America/Costa_Rica
+Central Standard Time~~~America/Chicago
+Central Standard Time (Mexico)~~~America/Monterrey
+Mexico Standard Time~~~America/Mexico_City
+Canada Central Standard Time~~~America/Winnipeg
+SA Pacific Standard Time~~~America/Bogota
+Eastern Standard Time~~~America/New_York
+US Eastern Standard Time~~~America/Indiana/Indianapolis
+Venezuela Standard Time~~~America/Caracas
+Atlantic Standard Time~~~America/Halifax
+SA Western Standard Time~~~America/La_Paz
+Central Brazilian Standard Time~~~America/Manaus
+Pacific SA Standard Time~~~America/La_Paz
+Newfoundland Standard Time~~~America/St_Johns
+E. South America Standard Time~~~America/Bahia
+SA Eastern Standard Time~~~America/Argentina/Buenos_Aires
+Greenland Standard Time~~~America/Godthab
+Montevideo Standard Time~~~America/Montevideo
+Mid-Atlantic Standard Time~~~Atlantic/South_Georgia
+Azores Standard Time~~~Atlantic/Azores
+Cape Verde Standard Time~~~Atlantic/Cape_Verde
+Greenwich Standard Time~~~Africa/Casablanca
+GMT Standard Time~~~Europe/Dublin
+UTC~~~UTC
+W. Europe Standard Time~~~Europe/Berlin
+Central Europe Standard Time~~~Europe/Prague
+Romance Standard Time~~~Europe/Paris
+Central European Standard Time~~~Europe/Belgrade
+W. Central Africa Standard Time~~~Africa/Luanda
+Jordan Standard Time~~~Asia/Amman
+GTB Standard Time~~~Europe/Athens
+Middle East Standard Time~~~Asia/Beirut
+Egypt Standard Time~~~Africa/Cairo
+South Africa Standard Time~~~Africa/Harare
+FLE Standard Time~~~Europe/Helsinki
+Israel Standard Time~~~Asia/Jerusalem
+E. Europe Standard Time~~~Europe/Minsk
+Namibia Standard Time~~~Africa/Windhoek
+Arabic Standard Time~~~Asia/Baghdad
+Arab Standard Time~~~Asia/Qatar
+Russian Standard Time~~~Europe/Moscow
+E. Africa Standard Time~~~Africa/Nairobi
+Georgian Standard Time~~~Asia/Tbilisi
+Iran Standard Time~~~Asia/Tehran
+Arabian Standard Time~~~Asia/Muscat
+Azerbaijan Standard Time~~~Asia/Baku
+Caucasus Standard Time~~~Asia/Yerevan
+Armenian Standard Time~~~Asia/Yerevan
+Afghanistan Standard Time~~~Asia/Kabul
+Ekaterinburg Standard Time~~~Asia/Yekaterinburg
+West Asia Standard Time~~~Asia/Karachi
+India Standard Time~~~Asia/Kolkata
+Sri Lanka Standard Time~~~Asia/Colombo
+Nepal Standard Time~~~Asia/Kathmandu
+N. Central Asia Standard Time~~~Asia/Novosibirsk
+Central Asia Standard Time~~~Asia/Dhaka
+Myanmar Standard Time~~~Asia/Rangoon
+SE Asia Standard Time~~~Asia/Bangkok
+North Asia Standard Time~~~Asia/Krasnoyarsk
+China Standard Time~~~Asia/Shanghai
+North Asia East Standard Time~~~Asia/Ulaanbaatar
+Singapore Standard Time~~~Asia/Singapore
+W. Australia Standard Time~~~Australia/Perth
+Taipei Standard Time~~~Asia/Taipei
+Tokyo Standard Time~~~Asia/Tokyo
+Korea Standard Time~~~Asia/Seoul
+Yakutsk Standard Time~~~Asia/Yakutsk
+Cen. Australia Standard Time~~~Australia/Adelaide
+AUS Central Standard Time~~~Australia/Darwin
+E. Australia Standard Time~~~Australia/Brisbane
+AUS Eastern Standard Time~~~Australia/Sydney
+West Pacific Standard Time~~~Pacific/Guam
+Tasmania Standard Time~~~Australia/Hobart
+Vladivostok Standard Time~~~Asia/Vladivostok
+Central Pacific Standard Time~~~Asia/Magadan
+New Zealand Standard Time~~~Pacific/Auckland
+Fiji Standard Time~~~Pacific/Fiji
+Tonga Standard Time~~~Pacific/Tongatapu

app/src/main/java/eu/faircode/email/CalendarHelper.java

@@ -33,6 +33,9 @@ import androidx.preference.PreferenceManager;
 
 import org.json.JSONObject;
 
+import java.io.BufferedReader;
+import java.io.InputStream;
+import java.io.InputStreamReader;
 import java.text.SimpleDateFormat;
 import java.util.Calendar;
 import java.util.Date;
@@ -129,44 +132,6 @@ public class CalendarHelper {
             }
         }
 
-        if (false) {
-            // BEGIN:VCALENDAR
-            // METHOD:REQUEST
-            // PRODID:Microsoft Exchange Server 2010
-            // VERSION:2.0
-            // BEGIN:VTIMEZONE
-            //   TZID:W. Europe Standard Time
-            //   BEGIN:STANDARD
-            //     DTSTART:16010101T030000
-            //     TZOFFSETFROM:+0200
-            //     TZOFFSETTO:+0100
-            //     RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=-1SU;BYMONTH=10
-            //   END:STANDARD
-            //   BEGIN:DAYLIGHT
-            //     DTSTART:16010101T020000
-            //     TZOFFSETFROM:+0100
-            //     TZOFFSETTO:+0200
-            //     RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=-1SU;BYMONTH=3
-            //   END:DAYLIGHT
-            // END:VTIMEZONE
-            // BEGIN:VEVENT
-            //   UID:...
-            //   DTSTART;TZID=W. Europe Standard Time:20231030T100000
-            //   DTEND;TZID=W. Europe Standard Time:20231030T110000
-            //   ...
-            for (TimezoneAssignment assignment : icalendar.getTimezoneInfo().getTimezones()) {
-                for (List<ICalComponent> components : assignment.getComponent().getComponents().getMap().values())
-                    for (ICalComponent component : components) {
-                        RecurrenceRule recurrence = component.getProperty(RecurrenceRule.class);
-                        if (recurrence != null) {
-                            RecurrenceRuleScribe scribe = new RecurrenceRuleScribe();
-                            WriteContext wcontext = new WriteContext(ICalVersion.V2_0, icalendar.getTimezoneInfo(), null);
-                            String rrule = scribe.writeText(recurrence, wcontext);
-                        }
-                    }
-            }
-        }
-
         String organizer = (event.getOrganizer() == null ? null : event.getOrganizer().getEmail());
 
         String summary = (event.getSummary() == null ? null : event.getSummary().getValue());
@@ -180,9 +145,25 @@ public class CalendarHelper {
         TimezoneInfo tzinfo = icalendar.getTimezoneInfo();
         TimezoneAssignment tza = (tzinfo == null ? null : tzinfo.getTimezone(event.getDateStart()));
         TimeZone tz = (tza == null ? null : tza.getTimeZone());
-        //if (tz != null && "W. Europe Standard Time".equals(tz.getID()))
+        String tzid = (tz == null ? null : tz.getID());
-        //    tz.setID("GMT");
+        if (tzid == null)
-        String tzid = (tz == null ? TimeZone.getDefault().getID() : tz.getID());
+            tzid = TimeZone.getDefault().getID();
+        else {
+            // https://github.com/GNOME/evolution-mapi/blob/master/src/libexchangemapi/tz-mapi-to-ical
+            try (InputStream is = context.getAssets().open("tz-mapi-to-ical.txt")) {
+                BufferedReader br = new BufferedReader(new InputStreamReader((is)));
+                String line;
+                while ((line = br.readLine()) != null) {
+                    String[] info = line.split("~~~");
+                    if (info.length == 2 && info[0].equalsIgnoreCase(tzid)) {
+                        EntityLog.log(context, "Event map " + tzid + " to " + info[1]);
+                        tz.setID(info[1]);
+                    }
+                }
+            } catch (Throwable ex) {
+                Log.e(ex);
+            }
+        }
 
         String rrule = null;
         RecurrenceRule recurrence = event.getRecurrenceRule();