+++ /dev/null
-//
-// This file contains functions which handle all of the CalDAV "REPORT" queries
-// specified in RFC4791 section 7.
-//
-// Copyright (c) 2022 by the citadel.org team
-//
-// This program is open source software. It runs great on the
-// Linux operating system (and probably elsewhere). You can use,
-// copy, and run it under the terms of the GNU General Public
-// License version 3.
-//
-// This program 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.
-
-#include "webcit.h"
-
-
-// A CalDAV REPORT can only be one type. This is stored in the report_type member.
-enum cr_type {
- cr_calendar_query,
- cr_calendar_multiget,
- cr_freebusy_query
-};
-
-
-// Data type for CalDAV Report Parameters.
-// As we slog our way through the XML we learn what the client is asking for
-// and build up the contents of this data type.
-struct cr_parms {
- int tag_nesting_level; // not needed, just kept for pretty-printing
- enum cr_type report_type; // which RFC4791 section 7 REPORT are we generating
- StrBuf *Chardata; // XML chardata in between tags is built up here
- StrBuf *Hrefs; // list of items requested by a calendar-multiget report
-};
-
-
-// XML parser callback
-void caldav_xml_start(void *data, const char *el, const char **attr) {
- struct cr_parms *crp = (struct cr_parms *) data;
- int i;
-
- // syslog(LOG_DEBUG, "CALDAV ELEMENT START: <%s> %d", el, crp->tag_nesting_level);
-
- for (i = 0; attr[i] != NULL; i += 2) {
- syslog(LOG_DEBUG, " Attribute '%s' = '%s'", attr[i], attr[i + 1]);
- }
-
- if (!strcasecmp(el, "urn:ietf:params:xml:ns:caldav:calendar-multiget")) {
- crp->report_type = cr_calendar_multiget;
- }
-
- else if (!strcasecmp(el, "urn:ietf:params:xml:ns:caldav:calendar-query")) {
- crp->report_type = cr_calendar_query;
- }
-
- else if (!strcasecmp(el, "urn:ietf:params:xml:ns:caldav:free-busy-query")) {
- crp->report_type = cr_freebusy_query;
- }
-
- ++crp->tag_nesting_level;
-}
-
-
-// XML parser callback
-void caldav_xml_end(void *data, const char *el) {
- struct cr_parms *crp = (struct cr_parms *) data;
- --crp->tag_nesting_level;
-
- if (crp->Chardata != NULL) {
- // syslog(LOG_DEBUG, "CALDAV CHARDATA : %s", ChrPtr(crp->Chardata));
- }
- // syslog(LOG_DEBUG, "CALDAV ELEMENT END : <%s> %d", el, crp->tag_nesting_level);
-
- if ((!strcasecmp(el, "DAV::href")) || (!strcasecmp(el, "DAV:href"))) {
- if (crp->Hrefs == NULL) { // append crp->Chardata to crp->Hrefs
- crp->Hrefs = NewStrBuf();
- }
- else {
- StrBufAppendBufPlain(crp->Hrefs, HKEY("|"), 0);
- }
- StrBufAppendBuf(crp->Hrefs, crp->Chardata, 0);
- }
-
- if (crp->Chardata != NULL) { // Tag is closed; chardata is now out of scope.
- FreeStrBuf(&crp->Chardata); // Free the buffer.
- crp->Chardata = NULL;
- }
-}
-
-
-// XML parser callback
-void caldav_xml_chardata(void *data, const XML_Char * s, int len) {
- struct cr_parms *crp = (struct cr_parms *) data;
-
- if (crp->Chardata == NULL) {
- crp->Chardata = NewStrBuf();
- }
-
- StrBufAppendBufPlain(crp->Chardata, s, len, 0);
-
- return;
-}
-
-
-// Called by caldav_response() to fetch a message (by number) in the current room,
-// and return only the icalendar data as a StrBuf. Returns NULL if not found.
-//
-// NOTE: this function expects that "MSGP text/calendar" was issued at the beginning
-// of a REPORT operation to set our preferred MIME type to calendar data.
-StrBuf *fetch_ical(struct ctdlsession * c, long msgnum) {
- char buf[1024];
- StrBuf *Buf = NULL;
-
- ctdl_printf(c, "MSG4 %ld", msgnum);
- ctdl_readline(c, buf, sizeof(buf));
- if (buf[0] != '1') {
- return NULL;
- }
-
- while (ctdl_readline(c, buf, sizeof(buf)), strcmp(buf, "000")) {
- if (Buf != NULL) { // already in body
- StrBufAppendPrintf(Buf, "%s\n", buf);
- }
- else if (IsEmptyStr(buf)) { // beginning of body
- Buf = NewStrBuf();
- }
- }
-
- return Buf;
-
-// webcit[13039]: msgn=53CE87AF-00392161@uncensored.citadel.org
-// webcit[13039]: path=IGnatius T Foobar
-// webcit[13039]: time=1208008800
-// webcit[13039]: from=IGnatius T Foobar
-// webcit[13039]: room=0000000001.Calendar
-// webcit[13039]: node=uncnsrd
-// webcit[13039]: hnod=Uncensored
-// webcit[13039]: exti=040000008200E00074C5B7101A82E0080000000080C728F83E84C801000000000000000010000000E857E0DC57F53947ADF0BB91EE3A502F
-// webcit[13039]: subj==?UTF-8?B?V2VzbGV5J3MgYmlydGhkYXkgcGFydHk=
-// webcit[13039]: ?=
-// webcit[13039]: part=||1||text/calendar|1127||
-// webcit[13039]: text
-// webcit[13039]: Content-type: text/calendar
-// webcit[13039]: Content-length: 1127
-// webcit[13039]: Content-transfer-encoding: 7bit
-// webcit[13039]: X-Citadel-MSG4-Partnum: 1
-// webcit[13039]:
-// webcit[13039]: BEGIN:VCALENDAR
-}
-
-
-// Called by caldav_report() to output a single item.
-// Our policy is to throw away the list of properties the client asked for, and just send everything.
-void caldav_response(struct http_transaction *h, struct ctdlsession *c, StrBuf * ReportOut, StrBuf * ThisHref) {
- long msgnum;
- StrBuf *Caldata = NULL;
- char *euid;
-
- euid = strrchr(ChrPtr(ThisHref), '/');
- if (euid != NULL) {
- ++euid;
- }
- else {
- euid = (char *) ChrPtr(ThisHref);
- }
-
- char *unescaped_euid = strdup(euid);
- if (!unescaped_euid)
- return;
- unescape_input(unescaped_euid);
-
- StrBufAppendPrintf(ReportOut, "<D:response>");
- StrBufAppendPrintf(ReportOut, "<D:href>");
- StrBufXMLEscAppend(ReportOut, ThisHref, NULL, 0, 0);
- StrBufAppendPrintf(ReportOut, "</D:href>");
- StrBufAppendPrintf(ReportOut, "<D:propstat>");
-
- msgnum = locate_message_by_uid(c, unescaped_euid);
- free(unescaped_euid);
- if (msgnum > 0) {
- Caldata = fetch_ical(c, msgnum);
- }
-
- if (Caldata != NULL) {
- // syslog(LOG_DEBUG, "caldav_response(%s) 200 OK", ChrPtr(ThisHref));
- StrBufAppendPrintf(ReportOut, "<D:status>");
- StrBufAppendPrintf(ReportOut, "HTTP/1.1 200 OK");
- StrBufAppendPrintf(ReportOut, "</D:status>");
- StrBufAppendPrintf(ReportOut, "<D:prop>");
- StrBufAppendPrintf(ReportOut, "<D:getetag>");
- StrBufAppendPrintf(ReportOut, "%ld", msgnum);
- StrBufAppendPrintf(ReportOut, "</D:getetag>");
- StrBufAppendPrintf(ReportOut, "<C:calendar-data>");
- StrBufXMLEscAppend(ReportOut, Caldata, NULL, 0, 0);
- StrBufAppendPrintf(ReportOut, "</C:calendar-data>");
- StrBufAppendPrintf(ReportOut, "</D:prop>");
- FreeStrBuf(&Caldata);
- Caldata = NULL;
- }
- else {
- // syslog(LOG_DEBUG, "caldav_response(%s) 404 not found", ChrPtr(ThisHref));
- StrBufAppendPrintf(ReportOut, "<D:status>");
- StrBufAppendPrintf(ReportOut, "HTTP/1.1 404 not found");
- StrBufAppendPrintf(ReportOut, "</D:status>");
- }
-
- StrBufAppendPrintf(ReportOut, "</D:propstat>");
- StrBufAppendPrintf(ReportOut, "</D:response>");
-}
-
-
-// Called by report_the_room_itself() in room_functions.c when a CalDAV REPORT method
-// is requested on a calendar room. We fire up an XML Parser to decode the request and
-// hopefully produce the correct output.
-void caldav_report(struct http_transaction *h, struct ctdlsession *c) {
- struct cr_parms crp;
- char buf[1024];
-
- memset(&crp, 0, sizeof(struct cr_parms));
-
- XML_Parser xp = XML_ParserCreateNS("UTF-8", ':');
- if (xp == NULL) {
- syslog(LOG_INFO, "Cannot create XML parser!");
- do_404(h);
- return;
- }
-
- XML_SetElementHandler(xp, caldav_xml_start, caldav_xml_end);
- XML_SetCharacterDataHandler(xp, caldav_xml_chardata);
- XML_SetUserData(xp, &crp);
- XML_SetDefaultHandler(xp, NULL); // Disable internal entity expansion to prevent "billion laughs attack"
- XML_Parse(xp, h->request_body, h->request_body_length, 1);
- XML_ParserFree(xp);
-
- if (crp.Chardata != NULL) { // Discard any trailing chardata ... normally nothing here
- FreeStrBuf(&crp.Chardata);
- crp.Chardata = NULL;
- }
-
- // We're going to make a lot of MSG4 calls, and the preferred MIME type we want is "text/calendar".
- // The iCalendar standard is mature now, and we are no longer interested in text/x-vcal or application/ics.
- ctdl_printf(c, "MSGP text/calendar");
- ctdl_readline(c, buf, sizeof buf);
-
- // Now begin the REPORT.
- syslog(LOG_DEBUG, "CalDAV REPORT type is: %d", crp.report_type);
- StrBuf *ReportOut = NewStrBuf();
- StrBufAppendPrintf(ReportOut, "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
- "<D:multistatus " "xmlns:D=\"DAV:\" " "xmlns:C=\"urn:ietf:params:xml:ns:caldav\"" ">");
-
- if (crp.Hrefs != NULL) { // Output all qualifying calendar items!
- StrBuf *ThisHref = NewStrBuf();
- const char *pvset = NULL;
- while (StrBufExtract_NextToken(ThisHref, crp.Hrefs, &pvset, '|') >= 0) {
- caldav_response(h, c, ReportOut, ThisHref);
- }
- FreeStrBuf(&ThisHref);
- FreeStrBuf(&crp.Hrefs);
- crp.Hrefs = NULL;
- }
-
- StrBufAppendPrintf(ReportOut, "</D:multistatus>\n"); // End the REPORT.
-
- add_response_header(h, strdup("Content-type"), strdup("text/xml"));
- h->response_code = 207;
- h->response_string = strdup("Multi-Status");
- h->response_body_length = StrLength(ReportOut);
- h->response_body = SmashStrBuf(&ReportOut);
-}
projects / citadel.git / blobdiff