tokidoki/storage/filesystem_caldav.go
2024-02-05 22:48:00 +01:00

373 lines
10 KiB
Go

package storage
import (
"context"
"encoding/json"
"errors"
"fmt"
"io/fs"
"net/http"
"os"
"path"
"path/filepath"
"github.com/rs/zerolog/log"
"github.com/emersion/go-ical"
"github.com/emersion/go-webdav"
"github.com/emersion/go-webdav/caldav"
)
const calendarFileName = "calendar.json"
func (b *filesystemBackend) CalendarHomeSetPath(ctx context.Context) (string, error) {
upPath, err := b.CurrentUserPrincipal(ctx)
if err != nil {
return "", err
}
return path.Join(upPath, b.caldavPrefix) + "/", nil
}
func (b *filesystemBackend) localCalDAVDir(ctx context.Context, components ...string) (string, error) {
homeSetPath, err := b.CalendarHomeSetPath(ctx)
if err != nil {
return "", err
}
return b.localDir(homeSetPath, components...)
}
func (b *filesystemBackend) safeLocalCalDAVPath(ctx context.Context, urlPath string) (string, error) {
homeSetPath, err := b.CalendarHomeSetPath(ctx)
if err != nil {
return "", err
}
return b.safeLocalPath(homeSetPath, urlPath)
}
func calendarFromFile(path string, propFilter []string) (*ical.Calendar, error) {
f, err := os.Open(path)
if err != nil {
return nil, err
}
defer f.Close()
dec := ical.NewDecoder(f)
cal, err := dec.Decode()
if err != nil {
return nil, err
}
return cal, nil
// TODO implement
//return icalPropFilter(cal, propFilter), nil
}
func (b *filesystemBackend) loadAllCalendarObjects(ctx context.Context, urlPath string, propFilter []string) ([]caldav.CalendarObject, error) {
var result []caldav.CalendarObject
localPath, err := b.safeLocalCalDAVPath(ctx, urlPath)
if err != nil {
return result, err
}
log.Debug().Str("path", localPath).Msg("loading calendar objects")
err = filepath.Walk(localPath, func(filename string, info os.FileInfo, err error) error {
if err != nil {
return fmt.Errorf("error accessing %s: %s", filename, err)
}
// Skip address book meta data files
if !info.Mode().IsRegular() || filepath.Ext(filename) != ".ics" {
return nil
}
cal, err := calendarFromFile(filename, propFilter)
if err != nil {
fmt.Printf("load calendar error for %s: %v\n", filename, err)
return err
}
etag, err := etagForFile(filename)
if err != nil {
return err
}
// TODO can this potentially be called on a calendar object resource?
// Would work (as Walk() includes root), except for the path construction below
obj := caldav.CalendarObject{
Path: path.Join(urlPath, filepath.Base(filename)),
ModTime: info.ModTime(),
ContentLength: info.Size(),
ETag: etag,
Data: cal,
}
result = append(result, obj)
return nil
})
return result, err
}
func (b *filesystemBackend) createDefaultCalendar(ctx context.Context) (*caldav.Calendar, error) {
// TODO what should the default calendar look like?
localPath, err_ := b.localCalDAVDir(ctx, defaultResourceName)
if err_ != nil {
return nil, fmt.Errorf("error creating default calendar: %s", err_.Error())
}
homeSetPath, err_ := b.CalendarHomeSetPath(ctx)
if err_ != nil {
return nil, fmt.Errorf("error creating default calendar: %s", err_.Error())
}
urlPath := path.Join(homeSetPath, defaultResourceName) + "/"
log.Debug().Str("local", localPath).Str("url", urlPath).Msg("filesystem.createDefaultCalendar()")
defaultC := caldav.Calendar{
Path: urlPath,
Name: "My calendar",
Description: "Default calendar",
MaxResourceSize: 4096,
}
blob, err := json.MarshalIndent(defaultC, "", " ")
if err != nil {
return nil, fmt.Errorf("error creating default calendar: %s", err.Error())
}
err = os.WriteFile(path.Join(localPath, calendarFileName), blob, 0644)
if err != nil {
return nil, fmt.Errorf("error writing default calendar: %s", err.Error())
}
return &defaultC, nil
}
func (b *filesystemBackend) ListCalendars(ctx context.Context) ([]caldav.Calendar, error) {
log.Debug().Msg("filesystem.ListCalendars()")
localPath, err := b.localCalDAVDir(ctx)
if err != nil {
return nil, err
}
log.Debug().Str("path", localPath).Msg("looking for calendars")
var result []caldav.Calendar
err = filepath.Walk(localPath, func(filename string, info os.FileInfo, err error) error {
if err != nil {
return fmt.Errorf("error accessing %s: %s", filename, err.Error())
}
if !info.IsDir() || filename == localPath {
return nil
}
calPath := path.Join(filename, calendarFileName)
data, err := os.ReadFile(calPath)
if err != nil {
if os.IsNotExist(err) {
return nil // not a calendar dir
} else {
return fmt.Errorf("error accessing %s: %s", calPath, err.Error())
}
}
var calendar caldav.Calendar
err = json.Unmarshal(data, &calendar)
if err != nil {
return fmt.Errorf("error reading calendar %s: %s", calPath, err.Error())
}
result = append(result, calendar)
return nil
})
if err == nil && len(result) == 0 {
// Nothing here yet? Create the default calendar.
log.Debug().Msg("no calendars found, creating default calendar")
cal, err := b.createDefaultCalendar(ctx)
if err == nil {
result = append(result, *cal)
}
}
log.Debug().Int("results", len(result)).Err(err).Msg("filesystem.ListCalendars() done")
return result, err
}
func (b *filesystemBackend) GetCalendar(ctx context.Context, urlPath string) (*caldav.Calendar, error) {
log.Debug().Str("path", urlPath).Msg("filesystem.GetCalendar()")
localPath, err := b.safeLocalCalDAVPath(ctx, urlPath)
if err != nil {
return nil, err
}
localPath = filepath.Join(localPath, calendarFileName)
log.Debug().Str("path", localPath).Msg("loading calendar")
data, err := os.ReadFile(localPath)
if err != nil {
if os.IsNotExist(err) {
return nil, webdav.NewHTTPError(404, err)
}
return nil, fmt.Errorf("error opening calendar: %s", err.Error())
}
var calendar caldav.Calendar
err = json.Unmarshal(data, &calendar)
if err != nil {
return nil, fmt.Errorf("error reading calendar: %s", err.Error())
}
return &calendar, nil
}
func (b *filesystemBackend) GetCalendarObject(ctx context.Context, objPath string, req *caldav.CalendarCompRequest) (*caldav.CalendarObject, error) {
log.Debug().Str("path", objPath).Msg("filesystem.GetCalendarObject()")
localPath, err := b.safeLocalCalDAVPath(ctx, objPath)
if err != nil {
return nil, err
}
info, err := os.Stat(localPath)
if err != nil {
if errors.Is(err, fs.ErrNotExist) {
return nil, webdav.NewHTTPError(404, err)
}
return nil, err
}
var propFilter []string
if req != nil && !req.AllProps {
propFilter = req.Props
}
calendar, err := calendarFromFile(localPath, propFilter)
if err != nil {
log.Debug().Str("path", localPath).Err(err).Msg("error reading calendar")
return nil, err
}
etag, err := etagForFile(localPath)
if err != nil {
return nil, err
}
obj := caldav.CalendarObject{
Path: objPath,
ModTime: info.ModTime(),
ContentLength: info.Size(),
ETag: etag,
Data: calendar,
}
return &obj, nil
}
func (b *filesystemBackend) ListCalendarObjects(ctx context.Context, urlPath string, req *caldav.CalendarCompRequest) ([]caldav.CalendarObject, error) {
log.Debug().Str("path", urlPath).Msg("filesystem.ListCalendarObjects()")
var propFilter []string
if req != nil && !req.AllProps {
propFilter = req.Props
}
result, err := b.loadAllCalendarObjects(ctx, urlPath, propFilter)
log.Debug().Int("results", len(result)).Err(err).Msg("filesystem.ListCalendarObjects() done")
return result, err
}
func (b *filesystemBackend) QueryCalendarObjects(ctx context.Context, urlPath string, query *caldav.CalendarQuery) ([]caldav.CalendarObject, error) {
log.Debug().Str("path", urlPath).Msg("filesystem.QueryCalendarObjects()")
var propFilter []string
if query != nil && !query.CompRequest.AllProps {
propFilter = query.CompRequest.Props
}
result, err := b.loadAllCalendarObjects(ctx, urlPath, propFilter)
log.Debug().Int("results", len(result)).Err(err).Msg("filesystem.QueryCalendarObjects() load done")
if err != nil {
return result, err
}
filtered, err := caldav.Filter(query, result)
log.Debug().Int("results", len(filtered)).Err(err).Msg("filesystem.QueryCalendarObjects() filter done")
return filtered, err
}
func (b *filesystemBackend) PutCalendarObject(ctx context.Context, objPath string, calendar *ical.Calendar, opts *caldav.PutCalendarObjectOptions) (loc string, err error) {
log.Debug().Str("path", objPath).Msg("filesystem.PutCalendarObject()")
_, uid, err := caldav.ValidateCalendarObject(calendar)
if err != nil {
return "", caldav.NewPreconditionError(caldav.PreconditionValidCalendarObjectResource)
}
// Object always get saved as <UID>.ics
dirname, _ := path.Split(objPath)
objPath = path.Join(dirname, uid+".ics")
localPath, err := b.safeLocalCalDAVPath(ctx, objPath)
if err != nil {
return "", err
}
flags := os.O_RDWR | os.O_CREATE | os.O_TRUNC
// TODO handle IfNoneMatch == ETag
if opts.IfNoneMatch.IsWildcard() {
// Make sure we're not overwriting an existing file
flags |= os.O_EXCL
} else if opts.IfMatch.IsWildcard() {
// Make sure we _are_ overwriting an existing file
flags &= ^os.O_CREATE
} else if opts.IfMatch.IsSet() {
// Make sure we overwrite the _right_ file
etag, err := etagForFile(localPath)
if err != nil {
return "", webdav.NewHTTPError(http.StatusPreconditionFailed, err)
}
want, err := opts.IfMatch.ETag()
if err != nil {
return "", webdav.NewHTTPError(http.StatusBadRequest, err)
}
if want != etag {
err = fmt.Errorf("If-Match does not match current ETag (%s/%s)", want, etag)
return "", webdav.NewHTTPError(http.StatusPreconditionFailed, err)
}
}
f, err := os.OpenFile(localPath, flags, 0666)
if os.IsExist(err) {
return "", caldav.NewPreconditionError(caldav.PreconditionNoUIDConflict)
} else if err != nil {
return "", err
}
defer f.Close()
enc := ical.NewEncoder(f)
err = enc.Encode(calendar)
if err != nil {
return "", err
}
return objPath, nil
}
func (b *filesystemBackend) DeleteCalendarObject(ctx context.Context, path string) error {
log.Debug().Str("path", path).Msg("filesystem.DeleteCalendarObject()")
localPath, err := b.safeLocalCalDAVPath(ctx, path)
if err != nil {
return err
}
err = os.Remove(localPath)
if err != nil {
return err
}
return nil
}