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/*
Copyright 2016 Canonical Ltd.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License version 3, as published
by the Free Software Foundation.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranties of
MERCHANTABILITY, SATISFACTORY QUALITY, 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, see <http://www.gnu.org/licenses/>.
*/
package caldav
import (
"bytes"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"os"
"strings"
"time"
"launchpad.net/account-polld/accounts"
"launchpad.net/account-polld/plugins"
"launchpad.net/account-polld/syncmonitor"
)
const (
APP_ID = "com.ubuntu.calendar_calendar"
pluginName = "caldav"
)
type CalDavPlugin struct {
accountId uint
}
func New(accountId uint) *CalDavPlugin {
return &CalDavPlugin{accountId: accountId}
}
func (p *CalDavPlugin) ApplicationId() plugins.ApplicationId {
return plugins.ApplicationId(APP_ID)
}
func (p *CalDavPlugin) Poll(authData *accounts.AuthData) ([]*plugins.PushMessageBatch, error) {
// This envvar check is to ease testing.
if token := os.Getenv("ACCOUNT_POLLD_TOKEN_CALDAV"); token != "" {
log.Print("Using token from: ACCOUNT_POLLD_TOKEN_CALDAV env var")
authData.AccessToken = token
}
log.Print("Check calendar changes for account:", p.accountId)
syncMonitor := syncmonitor.NewSyncMonitor()
if syncMonitor == nil {
log.Print("Sync monitor not available yet.")
return nil, nil
}
state, err := syncMonitor.State()
if err != nil {
log.Print("Fail to retrieve sync monitor state ", err)
return nil, nil
}
if state != "idle" {
log.Print("Sync monitor is not on 'idle' state, try later!")
return nil, nil
}
calendars, err := syncMonitor.ListCalendarsByAccount(p.accountId)
if err != nil {
log.Print("Calendar plugin ", p.accountId, ": cannot load calendars: ", err)
return nil, nil
}
var calendarsToSync []string
log.Print("Number of calendars for account:", p.accountId, " size:", len(calendars))
for id, calendar := range calendars {
lastSyncDate, err := syncMonitor.LastSyncDate(p.accountId, id)
if err != nil {
log.Print("\tcalendar: ", id, ", cannot load previous sync date: ", err, ". Try next time.")
continue
} else {
log.Print("\tcalendar: ", id, " Url: ", calendar, " last sync date: ", lastSyncDate)
}
var needSync bool
needSync = (len(lastSyncDate) == 0)
if !needSync {
resp, err := p.requestChanges(authData, calendar, lastSyncDate)
if err != nil {
log.Print("\tERROR: Fail to query for changes: ", err)
continue
}
needSync, err = p.containEvents(resp)
if err != nil {
log.Print("\tERROR: Fail to parse changes: ", err)
if err == plugins.ErrTokenExpired {
log.Print("\t\tAbort poll")
return nil, err
} else {
continue
}
}
}
if needSync {
log.Print("\tCalendar needs sync: ", id)
calendarsToSync = append(calendarsToSync, id)
} else {
log.Print("\tFound no calendar updates for account: ", p.accountId, " calendar: ", id)
}
}
if len(calendarsToSync) > 0 {
log.Print("Request account sync")
err = syncMonitor.SyncAccount(p.accountId, calendarsToSync)
if err != nil {
log.Print("ERROR: Fail to start account sync ", p.accountId, " message: ", err)
}
}
return nil, nil
}
func (p *CalDavPlugin) containEvents(resp *http.Response) (bool, error) {
defer resp.Body.Close()
log.Print("RESPONSE CODE ----:", resp.StatusCode)
if resp.StatusCode != 207 {
var errResp errorResp
log.Print("Invalid response:", errResp.Err.Code)
return false, nil
} else {
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return false, err
}
fmt.Printf("DATA: %s", data)
return strings.Contains(string(data), "BEGIN:VEVENT"), nil
}
return false, nil
}
func (p *CalDavPlugin) requestChanges(authData *accounts.AuthData, calendar string, lastSyncDate string) (*http.Response, error) {
u, err := url.Parse(calendar)
if err != nil {
return nil, err
}
startDate, err := time.Parse(time.RFC3339, lastSyncDate)
if err != nil {
log.Print("Fail to parse date: ", lastSyncDate)
return nil, err
}
// Start date will be one minute before last sync
startDate = startDate.Add(time.Duration(-1) * time.Minute)
// End Date will be one year in the future from now
endDate := time.Now().AddDate(1, 0, 0).UTC()
log.Print("Calendar Url:", calendar)
query := "<c:calendar-query xmlns:d=\"DAV:\" xmlns:c=\"urn:ietf:params:xml:ns:caldav\">\n"
query += "<d:prop>\n"
query += "<d:getetag />\n"
query += "<c:calendar-data />\n"
query += "</d:prop>\n"
query += "<c:filter>\n"
query += "<c:comp-filter name=\"VCALENDAR\">\n"
query += "<c:comp-filter name=\"VEVENT\">\n"
query += "<c:prop-filter name=\"LAST-MODIFIED\">\n"
query += "<c:time-range start=\"" + startDate.Format("20060102T150405Z") + "\" end=\"" + endDate.Format("20060102T150405Z") + "\"/>\n"
query += "</c:prop-filter>\n"
query += "</c:comp-filter>\n"
query += "</c:comp-filter>\n"
query += "</c:filter>\n"
query += "</c:calendar-query>\n"
log.Print("Query: ", query)
req, err := http.NewRequest("REPORT", u.String(), bytes.NewBufferString(query))
if err != nil {
return nil, err
}
req.Header.Set("Depth", "1")
req.Header.Set("Prefer", "return-minimal")
req.Header.Set("Content-Type", "application/xml; charset=utf-8")
req.SetBasicAuth(authData.UserName, authData.Secret)
return http.DefaultClient.Do(req)
}
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