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/* vim: set textwidth=80 tabstop=4: */
/* Copyright (c) 2008 Michael Rasmussen ([email protected])
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "lock-caldav-object.h"
#include "options-caldav-server.h"
#include <glib.h>
#include <curl/curl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/**
* A static literal string containing the lock query.
*/
static char* lock_query =
"<?xml version=\"1.0\" encoding=\"utf-8\" ?>"
"<D:lockinfo xmlns:D=\"DAV:\">"
" <D:lockscope><D:exclusive/></D:lockscope>"
" <D:locktype><D:write/></D:locktype>"
"</D:lockinfo>";
/**
* Function which requests a lock on a calendar resource
* @param URI The resource to request lock on.
* @param settings @see caldav_settings
* @param error A pointer to caldav_error. @see caldav_error
* @return The Lock-Token or NULL in case of error
*/
gchar* caldav_lock_object(
gchar* URI, caldav_settings* settings, caldav_error* error) {
CURL* curl;
CURLcode res = 0;
char error_buf[CURL_ERROR_SIZE];
struct config_data data;
struct MemoryStruct chunk;
struct MemoryStruct headers;
struct curl_slist *http_header = NULL;
gchar* lock_token = NULL;
gchar* url;
if (! caldav_lock_support(settings, error))
return lock_token;
chunk.memory = NULL; /* we expect realloc(NULL, size) to work */
chunk.size = 0; /* no data at this point */
headers.memory = NULL;
headers.size = 0;
curl = get_curl(settings);
if (!curl) {
error->code = -1;
error->str = g_strdup("Could not initialize libcurl");
g_free(settings->file);
settings->file = NULL;
return lock_token;
}
http_header = curl_slist_append(http_header,
"Content-Type: application/xml; charset=\"utf-8\"");
http_header = curl_slist_append(http_header, "Timeout: Second-300");
http_header = curl_slist_append(http_header, "Expect:");
http_header = curl_slist_append(http_header, "Transfer-Encoding:");
data.trace_ascii = settings->trace_ascii;
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, http_header);
/* send all data to this function */
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
/* we pass our 'chunk' struct to the callback function */
curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&chunk);
/* send all data to this function */
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, WriteHeaderCallback);
/* we pass our 'headers' struct to the callback function */
curl_easy_setopt(curl, CURLOPT_WRITEHEADER, (void *)&headers);
curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, (char *) &error_buf);
if (settings->debug) {
curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, my_trace);
curl_easy_setopt(curl, CURLOPT_DEBUGDATA, &data);
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
}
if (settings->usehttps) {
url = g_strdup_printf("https://%s", URI);
} else {
url = g_strdup_printf("http://%s", URI);
}
curl_easy_setopt(curl, CURLOPT_URL, url);
g_free(url);
/* enable uploading */
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, lock_query);
curl_easy_setopt (curl, CURLOPT_POSTFIELDSIZE, strlen(lock_query));
curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "LOCK");
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
curl_easy_setopt(curl, CURLOPT_UNRESTRICTED_AUTH, 1);
curl_easy_setopt(curl, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
res = curl_easy_perform(curl);
curl_slist_free_all(http_header);
if (res != 0) {
error->code = -1;
error->str = g_strdup_printf("%s", error_buf);
g_free(settings->file);
settings->file = NULL;
}
else {
long code;
res = curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
if (code != 200) {
gchar* status = get_tag("status", chunk.memory);
if (status && strstr(status, "423") != NULL) {
error->code = 423;
error->str = g_strdup(status);
}
else {
error->code = code;
error->str = g_strdup(chunk.memory);
}
g_free(status);
}
else {
lock_token = get_response_header(
"Lock-Token", headers.memory, FALSE);
}
}
if (chunk.memory)
free(chunk.memory);
if (headers.memory)
free(headers.memory);
curl_easy_cleanup(curl);
return lock_token;
}
/**
* Function which requests to have a lock removed from a calendar resource
* @param lock_token A privious aquired Lock-Token
* @param URI The resource to request unlock on.
* @param settings @see caldav_settings
* @param error A pointer to caldav_error. @see caldav_error
* @return False in case the lock could not be removed. True otherwise.
*/
gboolean caldav_unlock_object(gchar* lock_token, gchar* URI,
caldav_settings* settings, caldav_error* error) {
CURL* curl;
CURLcode res = 0;
char error_buf[CURL_ERROR_SIZE];
struct config_data data;
struct MemoryStruct chunk;
struct MemoryStruct headers;
struct curl_slist *http_header = NULL;
gboolean result = FALSE;
gchar* url;
if (! caldav_lock_support(settings, error))
return result;
chunk.memory = NULL; /* we expect realloc(NULL, size) to work */
chunk.size = 0; /* no data at this point */
headers.memory = NULL;
headers.size = 0;
curl = get_curl(settings);
if (!curl) {
error->code = -1;
error->str = g_strdup("Could not initialize libcurl");
g_free(settings->file);
settings->file = NULL;
return TRUE;
}
http_header = curl_slist_append(http_header,
g_strdup_printf("Lock-Token: %s", lock_token));
http_header = curl_slist_append(http_header, "Expect:");
http_header = curl_slist_append(http_header, "Transfer-Encoding:");
data.trace_ascii = settings->trace_ascii;
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, http_header);
/* send all data to this function */
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
/* we pass our 'chunk' struct to the callback function */
curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&chunk);
/* send all data to this function */
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, WriteHeaderCallback);
/* we pass our 'headers' struct to the callback function */
curl_easy_setopt(curl, CURLOPT_WRITEHEADER, (void *)&headers);
curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, (char *) &error_buf);
if (settings->debug) {
curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, my_trace);
curl_easy_setopt(curl, CURLOPT_DEBUGDATA, &data);
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
}
if (settings->usehttps) {
url = g_strdup_printf("https://%s", URI);
} else {
url = g_strdup_printf("http://%s", URI);
}
curl_easy_setopt(curl, CURLOPT_URL, url);
g_free(url);
/* enable uploading */
curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "UNLOCK");
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
curl_easy_setopt(curl, CURLOPT_UNRESTRICTED_AUTH, 1);
curl_easy_setopt(curl, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
res = curl_easy_perform(curl);
curl_slist_free_all(http_header);
if (res != 0) {
error->code = -1;
error->str = g_strdup_printf("%s", error_buf);
g_free(settings->file);
settings->file = NULL;
}
else {
long code;
res = curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
if (code != 204) {
error->code = code;
error->str = g_strdup(chunk.memory);
}
else {
result = TRUE;
}
}
if (chunk.memory)
free(chunk.memory);
if (headers.memory)
free(headers.memory);
curl_easy_cleanup(curl);
return result;
}
/**
* Function to test whether the server supports locking or not. Searching
* for PROP LOCK. If LOCK is present then according to RFC4791 PROP UNLOCK
* must also be present.
* @param settings @see caldav_settings
* @param error A pointer to caldav_error. @see caldav_error
* @return True if locking is supported by the server. False otherwise
*/
gboolean caldav_lock_support(caldav_settings* settings, caldav_error* error) {
gboolean found = FALSE;
gchar* url = NULL;
gchar* mystr = NULL;
runtime_info* info;
info = caldav_get_runtime_info();
info->options->verify_ssl_certificate = settings->verify_ssl_certificate;
info->options->custom_cacert = g_strdup(settings->custom_cacert);
if (settings->usehttps) {
mystr = g_strdup("https://");
} else {
mystr = g_strdup("http://");
}
if (settings->username && settings->password) {
url = g_strdup_printf("%s%s:%s@%s",
mystr, settings->username, settings->password, settings->url);
}
else if (settings->username) {
url = g_strdup_printf("%s%s@%s",
mystr, settings->username, settings->url);
}
else {
url = g_strdup_printf("%s%s", mystr, settings->url);
}
gchar** options = caldav_get_server_options(url, info);
g_free(url);
gchar** tmp = options;
caldav_free_runtime_info(&info);
while (*options) {
if (strcmp(*options++, "LOCK") == 0) {
found = TRUE;
break;
}
}
g_strfreev(tmp);
g_free(mystr);
return found;
}
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