/* Copyright (C) 2004 SKYRIX Software AG This file is part of OpenGroupware.org. OGo is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. OGo 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with OGo; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "iCalRenderer.h" #include "iCalEvent.h" #include "iCalPerson.h" #include "common.h" @interface NSDate(UsedPrivates) - (NSString *)icalString; // declared in NGiCal @end @implementation iCalRenderer static iCalRenderer *renderer = nil; /* assume length of 1K - reasonable ? */ static unsigned DefaultICalStringCapacity = 1024; + (id)sharedICalendarRenderer { if (renderer == nil) renderer = [[self alloc] init]; return renderer; } /* renderer */ - (void)addPreambleForAppointment:(iCalEvent *)_apt toString:(NSMutableString *)s { [s appendString:@"BEGIN:VCALENDAR\r\nMETHOD:REQUEST\r\n"]; [s appendString:@"PRODID:NGiCal/4.3\r\n"]; [s appendString:@"VERSION:2.0\r\n"]; } - (void)addPostambleForAppointment:(iCalEvent *)_apt toString:(NSMutableString *)s { [s appendString:@"END:VCALENDAR\r\n"]; } - (void)addOrganizer:(iCalPerson *)p toString:(NSMutableString *)s { NSString *x; if (![p isNotNull]) return; [s appendString:@"ORGANIZER;CN=\""]; if ((x = [p cn])) [s appendString:[x iCalDQUOTESafeString]]; [s appendString:@"\""]; if ((x = [p email])) { [s appendString:@":"]; /* sic! */ [s appendString:[x iCalSafeString]]; } [s appendString:@"\r\n"]; } - (void)addAttendees:(NSArray *)persons toString:(NSMutableString *)s { unsigned i, count; iCalPerson *p; count = [persons count]; for (i = 0; i < count; i++) { NSString *x; p = [persons objectAtIndex:i]; [s appendString:@"ATTENDEE;"]; if ((x = [p role])) { [s appendString:@"ROLE="]; [s appendString:[x iCalSafeString]]; [s appendString:@";"]; } [s appendString:@"CN=\""]; if ((x = [p cn])) { [s appendString:[x iCalDQUOTESafeString]]; } [s appendString:@"\""]; if ([(x = [p email]) isNotNull]) { [s appendString:@":"]; /* sic! */ [s appendString:[x iCalSafeString]]; } [s appendString:@"\r\n"]; } } - (void)addVEventForAppointment:(iCalEvent *)event toString:(NSMutableString *)s { id tmp; [s appendString:@"BEGIN:VEVENT\r\n"]; [s appendString:@"SUMMARY:"]; [s appendString:[[event summary] iCalSafeString]]; [s appendString:@"\r\n"]; if ([[event location] length] > 0) { [s appendString:@"LOCATION:"]; [s appendString:[[event location] iCalSafeString]]; [s appendString:@"\r\n"]; } if ((tmp = [event uid]) != nil) { [s appendString:@"UID:"]; [s appendString:tmp]; [s appendString:@"\r\n"]; } [s appendString:@"DTSTART:"]; [s appendString:[[event startDate] icalString]]; [s appendString:@"\r\n"]; if ([event hasEndDate]) { [s appendString:@"DTEND:"]; [s appendString:[[event endDate] icalString]]; [s appendString:@"\r\n"]; } if ([event hasDuration]) { [s appendString:@"DURATION:"]; [s appendString:[event duration]]; [s appendString:@"\r\n"]; } if ([[event priority] length] > 0) { [s appendString:@"PRIORITY:"]; [s appendString:[event priority]]; [s appendString:@"\r\n"]; } if ([[event categories] length] > 0) { NSString *catString; catString = [event categories]; [s appendString:@"CATEGORIES:"]; [s appendString:catString]; [s appendString:@"\r\n"]; } if ([[event comment] length] > 0) { [s appendString:@"DESCRIPTION:"]; /* this is what iCal.app does */ [s appendString:[[event comment] iCalSafeString]]; [s appendString:@"\r\n"]; } if ((tmp = [event status]) != nil) { [s appendString:@"STATUS:"]; [s appendString:tmp]; [s appendString:@"\r\n"]; } /* what's all this? */ [s appendString:@"TRANSP:OPAQUE\r\n"]; /* transparency */ [s appendString:@"CLASS:PRIVATE\r\n"]; /* classification [like 'top secret'] */ [self addOrganizer:[event organizer] toString:s]; [self addAttendees:[event attendees] toString:s]; /* postamble */ [s appendString:@"END:VEVENT\r\n"]; } - (BOOL)isValidAppointment:(iCalEvent *)_apt { if (![_apt isNotNull]) return NO; if ([[_apt uid] length] == 0) { [self logWithFormat: @"WARNING: got apt without uid, rejecting iCal generation: %@", _apt]; return NO; } if ([[[_apt startDate] icalString] length] == 0) { [self logWithFormat: @"WARNING: got apt without start date, " @"rejecting iCal generation: %@", _apt]; return NO; } return YES; } - (NSString *)vEventStringForEvent:(iCalEvent *)_apt { NSMutableString *s; if (![self isValidAppointment:_apt]) return nil; s = [NSMutableString stringWithCapacity:DefaultICalStringCapacity]; [self addVEventForAppointment:_apt toString:s]; return s; } - (NSString *)iCalendarStringForEvent:(iCalEvent *)_apt { NSMutableString *s; if (![self isValidAppointment:_apt]) return nil; s = [NSMutableString stringWithCapacity:DefaultICalStringCapacity]; [self addPreambleForAppointment:_apt toString:s]; [self addVEventForAppointment:_apt toString:s]; [self addPostambleForAppointment:_apt toString:s]; return s; } @end /* iCalRenderer */ @interface NSString (SOGoiCal_Private) - (NSString *)iCalCleanString; @end @interface SOGoICalStringEscaper : NSObject { } + (id)sharedEscaper; @end @implementation SOGoICalStringEscaper + (id)sharedEscaper { static id sharedInstance = nil; if (!sharedInstance) { sharedInstance = [[self alloc] init]; } return sharedInstance; } - (NSString *)stringByEscapingString:(NSString *)_s { unichar c; if (!_s || [_s length] == 0) return nil; c = [_s characterAtIndex:0]; if (c == '\n') { return @"\\n"; } else if (c == '\r') { return nil; /* effectively remove char */ } return [NSString stringWithFormat:@"\\%@", _s]; } @end @implementation NSString (SOGoiCal) #if 0 - (NSString *)iCalFoldedString { /* RFC2445, 4.1 Content Lines The iCalendar object is organized into individual lines of text, called content lines. Content lines are delimited by a line break, which is a CRLF sequence (US-ASCII decimal 13, followed by US-ASCII decimal 10). Lines of text SHOULD NOT be longer than 75 octets, excluding the line break. Long content lines SHOULD be split into a multiple line representations using a line "folding" technique. That is, a long line can be split between any two characters by inserting a CRLF immediately followed by a single linear white space character (i.e., SPACE, US-ASCII decimal 32 or HTAB, US-ASCII decimal 9). Any sequence of CRLF followed immediately by a single linear white space character is ignored (i.e., removed) when processing the content type. */ } #endif /* strip off any characters from string which are not allowed in iCal */ - (NSString *)iCalCleanString { static NSCharacterSet *replaceSet = nil; if (replaceSet == nil) { replaceSet = [NSCharacterSet characterSetWithCharactersInString:@"\r"]; [replaceSet retain]; } return [self stringByEscapingCharactersFromSet:replaceSet usingStringEscaping:[SOGoICalStringEscaper sharedEscaper]]; } - (NSString *)iCalDQUOTESafeString { static NSCharacterSet *escapeSet = nil; if (escapeSet == nil) { escapeSet = [NSCharacterSet characterSetWithCharactersInString:@"\\\""]; [escapeSet retain]; } return [self iCalEscapedStringWithEscapeSet:escapeSet]; } - (NSString *)iCalSafeString { static NSCharacterSet *escapeSet = nil; if (escapeSet == nil) { escapeSet = [[NSCharacterSet characterSetWithCharactersInString:@"\n,;\\\""] retain]; } return [self iCalEscapedStringWithEscapeSet:escapeSet]; } /* Escape unsafe characters */ - (NSString *)iCalEscapedStringWithEscapeSet:(NSCharacterSet *)_es { NSString *s; s = [self iCalCleanString]; return [s stringByEscapingCharactersFromSet:_es usingStringEscaping:[SOGoICalStringEscaper sharedEscaper]]; } @end /* NSString (SOGoiCal) */