--- /dev/null
+/*
+ * This file contains functions which handle all of the CalDAV "REPORT" queries
+ * specified in RFC4791 section 7.
+ *
+ * Copyright (c) 2016 by the citadel.org team
+ *
+ * This program is open source software; you can redistribute it and/or modify
+ * 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.
+ */
+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