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biosvos
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/*
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WebDAV 207 multi-status response handling
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Copyright (C) 1999-2004, Joe Orton <joe@manyfish.co.uk>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA
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*/
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/* Generic handling for WebDAV 207 Multi-Status responses. */
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#include "config.h"
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#include "ne_alloc.h"
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#include "ne_utils.h"
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#include "ne_xml.h"
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#include "ne_207.h"
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#include "ne_uri.h"
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#include "ne_basic.h"
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#include "ne_i18n.h"
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struct ne_207_parser_s {
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ne_207_start_response *start_response;
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ne_207_end_response *end_response;
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ne_207_start_propstat *start_propstat;
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ne_207_end_propstat *end_propstat;
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ne_xml_parser *parser;
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void *userdata;
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ne_buffer *cdata;
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/* remember whether we are in a response: the validation
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* doesn't encapsulate this since we only count as being
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* "in a response" when we've seen the href element. */
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int in_response;
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/* current position */
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void *response, *propstat;
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/* caching */
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ne_status status;
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char *description, *href;
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};
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#define ELM_multistatus 1
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#define ELM_response 2
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#define ELM_responsedescription 3
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#define ELM_href 4
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#define ELM_prop (NE_207_STATE_PROP)
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#define ELM_status 6
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#define ELM_propstat 7
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static const struct ne_xml_idmap map207[] = {
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{ "DAV:", "multistatus", ELM_multistatus },
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{ "DAV:", "response", ELM_response },
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{ "DAV:", "responsedescription", ELM_responsedescription },
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{ "DAV:", "href", ELM_href },
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{ "DAV:", "propstat", ELM_propstat },
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{ "DAV:", "prop", ELM_prop },
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{ "DAV:", "status", ELM_status }
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};
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/* Set the callbacks for the parser */
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void ne_207_set_response_handlers(ne_207_parser *p,
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ne_207_start_response *start,
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ne_207_end_response *end)
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{
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p->start_response = start;
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p->end_response = end;
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}
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void ne_207_set_propstat_handlers(ne_207_parser *p,
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ne_207_start_propstat *start,
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ne_207_end_propstat *end)
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{
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p->start_propstat = start;
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p->end_propstat = end;
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}
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void *ne_207_get_current_response(ne_207_parser *p)
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{
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return p->response;
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}
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void *ne_207_get_current_propstat(ne_207_parser *p)
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{
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return p->propstat;
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}
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/* return non-zero if (child, parent) is an interesting element */
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static int can_handle(int parent, int child)
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{
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return (parent == 0 && child == ELM_multistatus) ||
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(parent == ELM_multistatus && child == ELM_response) ||
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(parent == ELM_response &&
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(child == ELM_href || child == ELM_status ||
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child == ELM_propstat || child == ELM_responsedescription)) ||
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(parent == ELM_propstat &&
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(child == ELM_prop || child == ELM_status ||
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child == ELM_responsedescription));
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}
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static int cdata_207(void *userdata, int state, const char *buf, size_t len)
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{
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ne_207_parser *p = userdata;
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if ((state == ELM_href || state == ELM_responsedescription ||
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state == ELM_status) && p->cdata->used + len < 2048)
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ne_buffer_append(p->cdata, buf, len);
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return 0;
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}
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static int start_element(void *userdata, int parent,
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const char *nspace, const char *name,
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const char **atts)
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{
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ne_207_parser *p = userdata;
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int state = ne_xml_mapid(map207, NE_XML_MAPLEN(map207), nspace, name);
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if (!can_handle(parent, state))
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return NE_XML_DECLINE;
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/* if not in a response, ignore everything. */
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if (!p->in_response && state != ELM_response && state != ELM_multistatus &&
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state != ELM_href)
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return NE_XML_DECLINE;
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if (state == ELM_propstat && p->start_propstat) {
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p->propstat = p->start_propstat(p->userdata, p->response);
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if (p->propstat == NULL) {
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return NE_XML_ABORT;
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}
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}
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ne_buffer_clear(p->cdata);
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return state;
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}
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#define GIVE_STATUS(p) ((p)->status.reason_phrase?&(p)->status:NULL)
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#define HAVE_CDATA(p) ((p)->cdata->used > 1)
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static int
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end_element(void *userdata, int state, const char *nspace, const char *name)
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{
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ne_207_parser *p = userdata;
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const char *cdata = ne_shave(p->cdata->data, "\r\n\t ");
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switch (state) {
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case ELM_responsedescription:
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if (HAVE_CDATA(p)) {
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NE_FREE(p->description);
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p->description = ne_strdup(cdata);
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}
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break;
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case ELM_href:
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/* Now we have the href, begin the response */
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if (p->start_response && HAVE_CDATA(p)) {
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p->response = p->start_response(p->userdata, cdata);
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p->in_response = 1;
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}
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break;
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case ELM_status:
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if (HAVE_CDATA(p)) {
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NE_FREE(p->status.reason_phrase);
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if (ne_parse_statusline(cdata, &p->status)) {
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char buf[500];
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NE_DEBUG(NE_DBG_HTTP, "Status line: %s\n", cdata);
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ne_snprintf(buf, 500,
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_("Invalid HTTP status line in status element "
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"at line %d of response:\nStatus line was: %s"),
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ne_xml_currentline(p->parser), cdata);
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ne_xml_set_error(p->parser, buf);
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return -1;
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} else {
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NE_DEBUG(NE_DBG_XML, "Decoded status line: %s\n", cdata);
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}
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}
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break;
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case ELM_propstat:
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if (p->end_propstat)
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p->end_propstat(p->userdata, p->propstat, GIVE_STATUS(p),
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p->description);
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p->propstat = NULL;
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NE_FREE(p->description);
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NE_FREE(p->status.reason_phrase);
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break;
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case ELM_response:
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if (!p->in_response) break;
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if (p->end_response)
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p->end_response(p->userdata, p->response, GIVE_STATUS(p),
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p->description);
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p->response = NULL;
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p->in_response = 0;
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NE_FREE(p->status.reason_phrase);
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NE_FREE(p->description);
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break;
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}
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return 0;
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}
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ne_207_parser *ne_207_create(ne_xml_parser *parser, void *userdata)
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{
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ne_207_parser *p = ne_calloc(sizeof *p);
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p->parser = parser;
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p->userdata = userdata;
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p->cdata = ne_buffer_create();
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/* Add handler for the standard 207 elements */
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ne_xml_push_handler(parser, start_element, cdata_207, end_element, p);
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return p;
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}
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void ne_207_destroy(ne_207_parser *p)
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{
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if (p->status.reason_phrase) ne_free(p->status.reason_phrase);
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ne_buffer_destroy(p->cdata);
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ne_free(p);
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}
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int ne_accept_207(void *userdata, ne_request *req, const ne_status *status)
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{
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return (status->code == 207);
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}
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/* Handling of 207 errors: we keep a string buffer, and append
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* messages to it as they come down.
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*
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* Note, 424 means it would have worked but something else went wrong.
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* We will have had the error for "something else", so we display
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* that, and skip 424 errors. */
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/* This is passed as userdata to the 207 code. */
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struct context {
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char *href;
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ne_buffer *buf;
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unsigned int is_error;
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};
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static void *start_response(void *userdata, const char *href)
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{
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struct context *ctx = userdata;
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NE_FREE(ctx->href);
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ctx->href = ne_strdup(href);
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return NULL;
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}
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static void handle_error(struct context *ctx, const ne_status *status,
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const char *description)
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{
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if (status && status->klass != 2 && status->code != 424) {
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char buf[50];
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ctx->is_error = 1;
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sprintf(buf, "%d", status->code);
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ne_buffer_concat(ctx->buf, ctx->href, ": ",
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buf, " ", status->reason_phrase, "\n", NULL);
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if (description != NULL) {
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/* TODO: these can be multi-line. Would be good to
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* word-wrap this at col 80. */
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ne_buffer_concat(ctx->buf, " -> ", description, "\n", NULL);
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}
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}
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}
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static void end_response(void *userdata, void *response,
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const ne_status *status, const char *description)
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{
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struct context *ctx = userdata;
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handle_error(ctx, status, description);
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}
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static void
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end_propstat(void *userdata, void *propstat,
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const ne_status *status, const char *description)
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{
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struct context *ctx = userdata;
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handle_error(ctx, status, description);
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}
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/* Dispatch a DAV request and handle a 207 error response appropriately */
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/* TODO: hook up Content-Type parsing; passing charset to XML parser */
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int ne_simple_request(ne_session *sess, ne_request *req)
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{
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int ret;
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struct context ctx = {0};
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ne_207_parser *p207;
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ne_xml_parser *p;
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p = ne_xml_create();
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p207 = ne_207_create(p, &ctx);
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/* The error string is progressively written into the
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* ne_buffer by the element callbacks */
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ctx.buf = ne_buffer_create();
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ne_207_set_response_handlers(p207, start_response, end_response);
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ne_207_set_propstat_handlers(p207, NULL, end_propstat);
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ne_add_response_body_reader(req, ne_accept_207, ne_xml_parse_v, p);
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ret = ne_request_dispatch(req);
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if (ret == NE_OK) {
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if (ne_get_status(req)->code == 207) {
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if (ne_xml_failed(p)) {
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/* The parse was invalid */
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ne_set_error(sess, "%s", ne_xml_get_error(p));
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ret = NE_ERROR;
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} else if (ctx.is_error) {
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/* If we've actually got any error information
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* from the 207, then set that as the error */
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ne_set_error(sess, "%s", ctx.buf->data);
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ret = NE_ERROR;
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}
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} else if (ne_get_status(req)->klass != 2) {
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ret = NE_ERROR;
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}
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}
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ne_207_destroy(p207);
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ne_xml_destroy(p);
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ne_buffer_destroy(ctx.buf);
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NE_FREE(ctx.href);
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ne_request_destroy(req);
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return ret;
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}
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