Add aresult variable for CALENDAR_WRITE

This patch adds a CALENDAR_SUCCESS=1/0 variable that is set to show whether or
not CALENDAR_WRITE has passed. This patch also adds some debugging for caldav
PUT responses and no longer treats responses with no body as an error (as a PUT
gets a 201 Created with no body).

(closes issue ASTERISK-16903)
Reported by: Clod Patry
Tested by: Terry Wilson
Patches:
  	calendarstatus.diff uploaded by Clod Patry (License #5138), slightly modified by Terry Wilson

Review: https://reviewboard.asterisk.org/r/1692/
- This line, and those below, will be ignored--

M    res/res_calendar.c
M    res/res_calendar_exchange.c
M    res/res_calendar_caldav.c


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@352916 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_calendar.c

@@ -54,7 +54,7 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 		<syntax>
 			<parameter name="calendar" required="true" />
 		</syntax>
-    	<description>
+		<description>
 			<para>Check the specified calendar's current busy status.</para>
 		</description>
 		<see-also>
@@ -186,6 +186,18 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 		<description>
 			<para>Example: CALENDAR_WRITE(calendar,field1,field2,field3)=val1,val2,val3</para>
 			<para>The field and value arguments can easily be set/passed using the HASHKEYS() and HASH() functions</para>
+			<variablelist>
+				<variable name="CALENDAR_SUCCESS">
+					<para>The status of the write operation to the calendar</para>
+					<value name="1" >
+						The event was successfully written to the calendar.
+					</value>
+					<value name="0" >
+						The event was not written to the calendar due to network issues, permissions, etc.
+					</value>
+				</variable>
+			</variablelist>
+
 		</description>
 		<see-also>
 			<ref type="function">CALENDAR_BUSY</ref>
@@ -1361,7 +1373,7 @@ static int calendar_write_exec(struct ast_channel *chan, const char *cmd, char *
 
 	if (!(val_dup = ast_strdup(value))) {
 		ast_log(LOG_ERROR, "Could not allocate memory for values\n");
-		return -1;
+		goto write_cleanup;
 	}
 
 	AST_STANDARD_APP_ARGS(fields, data);
@@ -1434,6 +1446,11 @@ static int calendar_write_exec(struct ast_channel *chan, const char *cmd, char *
 	}
 
 write_cleanup:
+	if (ret) {
+		pbx_builtin_setvar_helper(chan, "CALENDAR_SUCCESS", "0");
+	} else {
+		pbx_builtin_setvar_helper(chan, "CALENDAR_SUCCESS", "1");
+	}
 	if (cal) {
 		cal = unref_calendar(cal);
 	}

res/res_calendar_caldav.c

@@ -125,6 +125,15 @@ static int auth_credentials(void *userdata, const char *realm, int attempts, cha
 	return 0;
 }
 
+static int debug_response_handler(void *userdata, ne_request *req, const ne_status *st)
+{
+	if (st->code < 200 || st->code > 299) {
+		ast_debug(1, "Unexpected response from server, %d: %s\n", st->code, st->reason_phrase);
+		return 0;
+	}
+	return 1;
+}
+
 static struct ast_str *caldav_request(struct caldav_pvt *pvt, const char *method, struct ast_str *req_body, struct ast_str *subdir, const char *content_type)
 {
 	struct ast_str *response;
@@ -145,17 +154,15 @@ static struct ast_str *caldav_request(struct caldav_pvt *pvt, const char *method
 	snprintf(buf, sizeof(buf), "%s%s", pvt->uri.path, subdir ? ast_str_buffer(subdir) : "");
 
 	req = ne_request_create(pvt->session, method, buf);
-	ne_add_response_body_reader(req, ne_accept_2xx, fetch_response_reader, &response);
+	ne_add_response_body_reader(req, debug_response_handler, fetch_response_reader, &response);
 	ne_set_request_body_buffer(req, ast_str_buffer(req_body), ast_str_strlen(req_body));
 	ne_add_request_header(req, "Content-type", ast_strlen_zero(content_type) ? "text/xml" : content_type);
 
 	ret = ne_request_dispatch(req);
 	ne_request_destroy(req);
 
-	if (ret != NE_OK || !ast_str_strlen(response)) {
-		if (ret != NE_OK) {
-			ast_log(LOG_WARNING, "Unknown response to CalDAV calendar %s, request %s to %s: %s\n", pvt->owner->name, method, buf, ne_get_error(pvt->session));
-		}
+	if (ret != NE_OK) {
+		ast_log(LOG_WARNING, "Unknown response to CalDAV calendar %s, request %s to %s: %s\n", pvt->owner->name, method, buf, ne_get_error(pvt->session));
 		ast_free(response);
 		return NULL;
 	}
@@ -244,9 +251,9 @@ static int caldav_write_event(struct ast_calendar_event *event)
 	ast_str_append(&body, 0, "%s", icalcomponent_as_ical_string(calendar));
 	ast_str_set(&subdir, 0, "%s%s.ics", pvt->url[strlen(pvt->url) - 1] == '/' ? "" : "/", event->uid);
 
-	response = caldav_request(pvt, "PUT", body, subdir, "text/calendar");
-
-	ret = 0;
+	if ((response = caldav_request(pvt, "PUT", body, subdir, "text/calendar"))) {
+		ret = 0;
+	}
 
 write_cleanup:
 	if (body) {
@@ -302,6 +309,10 @@ static struct ast_str *caldav_get_events_between(struct caldav_pvt *pvt, time_t
 
 	response = caldav_request(pvt, "REPORT", body, NULL, NULL);
 	ast_free(body);
+	if (response && !ast_str_strlen(response)) {
+		ast_free(response);
+		return NULL;
+	}
 
 	return response;
 }

res/res_calendar_exchange.c

@@ -505,9 +505,10 @@ static int exchangecal_write_event(struct ast_calendar_event *event)
 	ast_verb(0, "\n\n%s\n\n", ast_str_buffer(body));
 	ast_str_set(&subdir, 0, "/Calendar/%s.eml", ast_str_buffer(uid));
 
-	response = exchangecal_request(event->owner->tech_pvt, "PROPPATCH", body, subdir);
+	if ((response = exchangecal_request(event->owner->tech_pvt, "PROPPATCH", body, subdir))) {
+		ret = 0;
+	}
 
-	ret = 0;
 write_cleanup:
 	if (uid) {
 		ast_free(uid);