Initial import

1 files changed, 555 insertions, 0 deletions

diff --git a/src/modify-caldav-object.c b/src/modify-caldav-object.c
new file mode 100644
index 0000000..fb3a4d0
--- /dev/null
+++ b/src/modify-caldav-object.c
@@ -0,0 +1,555 @@
+/* vim: set textwidth=80 tabstop=4: */
+
+/* Copyright (c) 2008 Michael Rasmussen (mir@datanom.net)
+ *
+ * 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 "modify-caldav-object.h"
+#include "lock-caldav-object.h"
+#include <glib.h>
+#include <curl/curl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/**
+ * A static literal string containing the first part of the calendar query.
+ * The actual UID to use for the query is added at runtime.
+ */
+static char* search_head =
+"<?xml version=\"1.0\" encoding=\"utf-8\" ?>"
+"<C:calendar-query xmlns:D=\"DAV:\""
+"                  xmlns:C=\"urn:ietf:params:xml:ns:caldav\">"
+"  <D:prop>"
+"    <D:getetag/>"
+"    <C:calendar-data/>"
+"  </D:prop>"
+"  <C:filter>"
+"    <C:comp-filter name=\"VCALENDAR\">"
+"      <C:comp-filter name=\"VEVENT\">"
+"        <C:prop-filter name=\"UID\">";
+
+/**
+ * A static literal string containing the first part of the calendar query.
+ * The actual UID to use for the query is added at runtime.
+ */
+static char* search_tasks_head =
+"<?xml version=\"1.0\" encoding=\"utf-8\" ?>"
+"<C:calendar-query xmlns:D=\"DAV:\""
+"                  xmlns:C=\"urn:ietf:params:xml:ns:caldav\">"
+"  <D:prop>"
+"    <D:getetag/>"
+"    <C:calendar-data/>"
+"  </D:prop>"
+"  <C:filter>"
+"    <C:comp-filter name=\"VCALENDAR\">"
+"      <C:comp-filter name=\"VTODO\">"
+"        <C:prop-filter name=\"UID\">";
+
+/**
+ * A static literal string containing the last part of the calendar query
+ */
+static char* search_tail =
+"</C:prop-filter>"
+"      </C:comp-filter>"
+"    </C:comp-filter>"
+"  </C:filter>"
+"</C:calendar-query>";
+
+/**
+ * Function for modifying an event.
+ * @param settings A pointer to caldav_settings. @see caldav_settings
+ * @param error A pointer to caldav_error. @see caldav_error
+ * @return TRUE in case of error, FALSE otherwise.
+ */
+gboolean caldav_modify(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* search;
+	gchar* uid;
+	gboolean result = FALSE;
+	gboolean LOCKSUPPORT = FALSE;
+	gchar* lock_token = NULL;
+
+	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,
+			"Content-Type: application/xml; charset=\"utf-8\"");
+	http_header = curl_slist_append(http_header, "Depth: 1");
+	http_header = curl_slist_append(http_header, "Expect:");
+	http_header = curl_slist_append(http_header, "Transfer-Encoding:");
+	http_header = curl_slist_append(http_header, "Connection: close");
+	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);
+	}
+	gchar* file = g_strdup(settings->file);
+	if ((uid = get_response_header("uid", file, FALSE)) == NULL) {
+		g_free(file);
+		error->code = 1;
+		error->str = g_strdup("Error: Missing required UID for object");
+		return TRUE;
+	}
+	g_free(file);
+	/*
+	 * collation is not supported by ICalendar.
+	 * <C:text-match collation=\"i;ascii-casemap\">%s</C:text-match>
+	 */
+	search = g_strdup_printf(
+		"%s\r\n<C:text-match>%s</C:text-match>\r\n%s",
+		search_head, uid, search_tail);
+	g_free(uid);
+	/* enable uploading */
+	curl_easy_setopt(curl, CURLOPT_POSTFIELDS, search);
+	curl_easy_setopt (curl, CURLOPT_POSTFIELDSIZE, strlen(search));
+	curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "REPORT");
+	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);
+	http_header = NULL;
+	g_free(search);
+	if (res != 0) {
+		error->code = -1;
+		error->str = g_strdup_printf("%s", error_buf);
+		g_free(settings->file);
+		settings->file = NULL;
+		result = TRUE;
+	}
+	else {
+		long code;
+		res = curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
+		if (code != 207) {
+			error->code = code;
+			error->str = g_strdup(chunk.memory);
+			result = TRUE;
+		}
+		else {
+			/* enable uploading */
+			gchar* url = NULL;
+			gchar* etag = NULL;
+			url = get_url(chunk.memory);
+			if (url) {
+				etag = get_etag(chunk.memory);
+				if (etag) {
+					gchar* host = get_host(settings->url);
+					if (host) {
+						file = g_strdup(url);
+						g_free(url);
+						url = g_strdup_printf("%s%s", host, file);
+						g_free(file);
+						g_free(host);
+					}
+					else {
+						g_free(etag);
+						g_free(url);
+						url = NULL;
+					}
+				}
+				else {
+					g_free(url);
+					url = NULL;
+				}
+				if (url) {
+					int lock = 0;
+					caldav_error lock_error;
+	
+					file = g_strdup(etag);
+					g_free(etag);
+					etag = g_strdup_printf("If-Match: %s", file);
+					g_free(file);
+					http_header = curl_slist_append(http_header, etag);
+					g_free(etag);
+					http_header = curl_slist_append(http_header,
+						"Content-Type: text/calendar; charset=\"utf-8\"");
+					http_header = curl_slist_append(http_header, "Expect:");
+					http_header = curl_slist_append(
+									http_header, "Transfer-Encoding:");
+					http_header = curl_slist_append(http_header, "Connection: close");
+					if (settings->use_locking)
+						LOCKSUPPORT = caldav_lock_support(settings, &lock_error);
+					else
+						LOCKSUPPORT = FALSE;
+					if (LOCKSUPPORT) {
+						lock_token = caldav_lock_object(url, settings, &lock_error);
+						if (lock_token) {
+							http_header = curl_slist_append(
+								http_header, g_strdup_printf(
+										"If: (%s)", lock_token));
+						}
+						/*
+						 * If error code is 423 (Resource is LOCKED) bail out
+						 */
+						else if (lock_error.code == 423) {
+							lock = -1;
+						}
+						/*
+						 * If error code is 501 (Not implemented) we continue
+						 * hoping for the best.
+						 */
+						else if (lock_error.code == 501) {
+							lock_token = g_strdup("");
+						}
+						else {
+							lock = -1;
+						}
+					}
+					if (! LOCKSUPPORT || (LOCKSUPPORT && lock_token && lock_error.code != 423)) {
+						curl_easy_setopt(curl, CURLOPT_HTTPHEADER, http_header);
+						curl_easy_setopt(curl, CURLOPT_URL, rebuild_url(settings, url));
+						curl_easy_setopt(curl, CURLOPT_POSTFIELDS, settings->file);
+						curl_easy_setopt (curl, CURLOPT_POSTFIELDSIZE, 
+									strlen(settings->file));
+						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);
+						curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "PUT");
+						res = curl_easy_perform(curl);
+						if (LOCKSUPPORT && lock_token) {
+							caldav_unlock_object(
+									lock_token, url, settings, &lock_error);
+						}
+					}
+					g_free(url);
+					g_free(lock_token);
+					if (res != 0 || lock < 0) {
+						/* Is this a lock_error don't change error*/
+						if (lock == 0 || lock_error.code == 423) {
+							error->code = code;
+							error->str = g_strdup(chunk.memory);
+						}
+						else {
+							error->code = lock_error.code;
+							error->str = g_strdup(lock_error.str);
+						}
+						result = TRUE;
+						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);
+							result = TRUE;
+						}
+					}
+					curl_slist_free_all(http_header);
+				}
+				else {
+					error->code = code;
+					if (chunk.memory)
+						error->str = g_strdup(chunk.memory);
+					else
+						error->str = g_strdup("No object found");
+					result = TRUE;
+				}
+			}
+			else {
+				/* 
+				 * No object found on server. Posible synchronization
+				 * problem or a server side race condition
+				 */
+				error->code = 409;
+				error->str = g_strdup("No object found");
+				result = TRUE;
+			}
+		}
+	}
+	if (chunk.memory)
+		free(chunk.memory);
+	if (headers.memory)
+		free(headers.memory);
+	curl_easy_cleanup(curl);
+	return result;
+}
+
+/**
+ * Function for modifying a task.
+ * @param settings A pointer to caldav_settings. @see caldav_settings
+ * @param error A pointer to caldav_error. @see caldav_error
+ * @return TRUE in case of error, FALSE otherwise.
+ */
+gboolean caldav_tasks_modify(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* search;
+	gchar* uid;
+	gboolean result = FALSE;
+	gboolean LOCKSUPPORT = FALSE;
+	gchar* lock_token = NULL;
+
+	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,
+			"Content-Type: application/xml; charset=\"utf-8\"");
+	http_header = curl_slist_append(http_header, "Depth: 1");
+	http_header = curl_slist_append(http_header, "Expect:");
+	http_header = curl_slist_append(http_header, "Transfer-Encoding:");
+	http_header = curl_slist_append(http_header, "Connection: close");
+	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);
+	}
+	gchar* file = g_strdup(settings->file);
+	if ((uid = get_response_header("uid", file, FALSE)) == NULL) {
+		g_free(file);
+		error->code = 1;
+		error->str = g_strdup("Error: Missing required UID for object");
+		return TRUE;
+	}
+	g_free(file);
+	/*
+	 * collation is not supported by ICalendar.
+	 * <C:text-match collation=\"i;ascii-casemap\">%s</C:text-match>
+	 */
+	search = g_strdup_printf(
+		"%s\r\n<C:text-match>%s</C:text-match>\r\n%s",
+		search_tasks_head, uid, search_tail);
+	g_free(uid);
+	/* enable uploading */
+	curl_easy_setopt(curl, CURLOPT_POSTFIELDS, search);
+	curl_easy_setopt (curl, CURLOPT_POSTFIELDSIZE, strlen(search));
+	curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "REPORT");
+	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);
+	http_header = NULL;
+	g_free(search);
+	if (res != 0) {
+		error->code = -1;
+		error->str = g_strdup_printf("%s", error_buf);
+		g_free(settings->file);
+		settings->file = NULL;
+		result = TRUE;
+	}
+	else {
+		long code;
+		res = curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
+		if (code != 207) {
+			error->code = code;
+			error->str = g_strdup(chunk.memory);
+			result = TRUE;
+		}
+		else {
+			/* enable uploading */
+			gchar* url = NULL;
+			gchar* etag = NULL;
+			url = get_url(chunk.memory);
+			if (url) {
+				etag = get_etag(chunk.memory);
+				if (etag) {
+					gchar* host = get_host(settings->url);
+					if (host) {
+						file = g_strdup(url);
+						g_free(url);
+						url = g_strdup_printf("%s%s", host, file);
+						g_free(file);
+						g_free(host);
+					}
+					else {
+						g_free(etag);
+						g_free(url);
+						url = NULL;
+					}
+				}
+				else {
+					g_free(url);
+					url = NULL;
+				}
+				if (url) {
+					int lock = 0;
+					caldav_error lock_error;
+	
+					file = g_strdup(etag);
+					g_free(etag);
+					etag = g_strdup_printf("If-Match: %s", file);
+					g_free(file);
+					http_header = curl_slist_append(http_header, etag);
+					g_free(etag);
+					http_header = curl_slist_append(http_header,
+						"Content-Type: text/calendar; charset=\"utf-8\"");
+					http_header = curl_slist_append(http_header, "Expect:");
+					http_header = curl_slist_append(
+									http_header, "Transfer-Encoding:");
+					http_header = curl_slist_append(http_header, "Connection: close");
+					if (settings->use_locking)
+						LOCKSUPPORT = caldav_lock_support(settings, &lock_error);
+					else
+						LOCKSUPPORT = FALSE;
+					if (LOCKSUPPORT) {
+						lock_token = caldav_lock_object(url, settings, &lock_error);
+						if (lock_token) {
+							http_header = curl_slist_append(
+								http_header, g_strdup_printf(
+										"If: (%s)", lock_token));
+						}
+						/*
+						 * If error code is 423 (Resource is LOCKED) bail out
+						 */
+						else if (lock_error.code == 423) {
+							lock = -1;
+						}
+						/*
+						 * If error code is 501 (Not implemented) we continue
+						 * hoping for the best.
+						 */
+						else if (lock_error.code == 501) {
+							lock_token = g_strdup("");
+						}
+						else {
+							lock = -1;
+						}
+					}
+					if (! LOCKSUPPORT || (LOCKSUPPORT && lock_token && lock_error.code != 423)) {
+						curl_easy_setopt(curl, CURLOPT_HTTPHEADER, http_header);
+						curl_easy_setopt(curl, CURLOPT_URL, rebuild_url(settings, url));
+						curl_easy_setopt(curl, CURLOPT_POSTFIELDS, settings->file);
+						curl_easy_setopt (curl, CURLOPT_POSTFIELDSIZE, 
+									strlen(settings->file));
+						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);
+						curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "PUT");
+						res = curl_easy_perform(curl);
+						if (LOCKSUPPORT && lock_token) {
+							caldav_unlock_object(
+									lock_token, url, settings, &lock_error);
+						}
+					}
+					g_free(url);
+					g_free(lock_token);
+					if (res != 0 || lock < 0) {
+						/* Is this a lock_error don't change error*/
+						if (lock == 0 || lock_error.code == 423) {
+							error->code = code;
+							error->str = g_strdup(chunk.memory);
+						}
+						else {
+							error->code = lock_error.code;
+							error->str = g_strdup(lock_error.str);
+						}
+						result = TRUE;
+						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);
+							result = TRUE;
+						}
+					}
+					curl_slist_free_all(http_header);
+				}
+				else {
+					error->code = code;
+					if (chunk.memory)
+						error->str = g_strdup(chunk.memory);
+					else
+						error->str = g_strdup("No object found");
+					result = TRUE;
+				}
+			}
+			else {
+				/* 
+				 * No object found on server. Posible synchronization
+				 * problem or a server side race condition
+				 */
+				error->code = 409;
+				error->str = g_strdup("No object found");
+				result = TRUE;
+			}
+		}
+	}
+	if (chunk.memory)
+		free(chunk.memory);
+	if (headers.memory)
+		free(headers.memory);
+	curl_easy_cleanup(curl);
+	return result;
+}
+