carddav: add support for REPORT addressbook-multiget, fixes #2

carddav/carddav.go

@@ -5,12 +5,9 @@ package carddav
 import (
 	"bytes"
 	"encoding/xml"
-	"errors"
 	"net/http"
+	"net/url"
 	"os"
-	"strconv"
-	"strings"
-	"time"
 
 	"github.com/emersion/go-vcard"
 	"github.com/emersion/go-webdav"
@@ -19,310 +16,7 @@ import (
 	"log"
 )
 
-var (
-	errNotYetImplemented = errors.New("not yet implemented")
-	errUnsupported = errors.New("unsupported")
-)
-
-const nsDAV = "DAV:"
-
-var (
-	resourcetype = xml.Name{Space: nsDAV, Local: "resourcetype"}
-	displayname = xml.Name{Space: nsDAV, Local: "displayname"}
-	getcontenttype = xml.Name{Space: nsDAV, Local: "getcontenttype"}
-)
-
-const nsCardDAV = "urn:ietf:params:xml:ns:carddav"
-
-var (
-	addressBookDescription = xml.Name{Space: nsCardDAV, Local: "addressbook-description"}
-	addressBookSupportedAddressData = xml.Name{Space: nsCardDAV, Local: "supported-address-data"}
-	addressBookMaxResourceSize = xml.Name{Space: nsCardDAV, Local: "max-resource-size"}
-	addressBookHomeSet = xml.Name{Space: nsCardDAV, Local: "addressbook-home-set"}
-)
-
-type fileInfo struct {
-	name string
-	size int64
-	mode os.FileMode
-	modTime time.Time
-}
-
-func (fi *fileInfo) Name() string {
-	return fi.name
-}
-
-func (fi *fileInfo) Size() int64 {
-	return fi.size
-}
-
-func (fi *fileInfo) Mode() os.FileMode {
-	return fi.mode
-}
-
-func (fi *fileInfo) ModTime() time.Time {
-	return fi.modTime
-}
-
-func (fi *fileInfo) IsDir() bool {
-	return fi.mode.IsDir()
-}
-
-func (fi *fileInfo) Sys() interface{} {
-	return nil
-}
-
-type file struct {
-	*bytes.Reader
-	fs *fileSystem
-	name string
-	ao AddressObject
-}
-
-func (f *file) Close() error {
-	return nil
-}
-
-func (f *file) Read(b []byte) (int, error) {
-	if f.Reader == nil {
-		card, err := f.ao.Card()
-		if err != nil {
-			return 0, err
-		}
-
-		var b bytes.Buffer
-		if err := vcard.NewEncoder(&b).Encode(card); err != nil {
-			return 0, err
-		}
-
-		f.Reader = bytes.NewReader(b.Bytes())
-	}
-
-	return f.Reader.Read(b)
-}
-
-func (f *file) Write(b []byte) (int, error) {
-	return 0, errUnsupported
-}
-
-func (f *file) Seek(offset int64, whence int) (int64, error) {
-	if f.Reader == nil {
-		if _, err := f.Read(nil); err != nil {
-			return 0, err
-		}
-	}
-
-	return f.Reader.Seek(offset, whence)
-}
-
-func (f *file) Readdir(count int) ([]os.FileInfo, error) {
-	return nil, errUnsupported
-}
-
-func (f *file) Stat() (os.FileInfo, error) {
-	info, err := f.ao.Stat()
-	if info != nil || err != nil {
-		return info, err
-	}
-
-	return &fileInfo{
-		name: f.name,
-		mode: os.ModePerm,
-	}, nil
-}
-
-// TODO: getcontenttype for file
-
-type dir struct {
-	fs *fileSystem
-	name string
-	files []os.FileInfo
-
-	n int
-}
-
-func (d *dir) Close() error {
-	return nil
-}
-
-func (d *dir) Read(b []byte) (int, error) {
-	return 0, errUnsupported
-}
-
-func (d *dir) Write(b []byte) (int, error) {
-	return 0, errUnsupported
-}
-
-func (d *dir) Seek(offset int64, whence int) (int64, error) {
-	return 0, errUnsupported
-}
-
-func (d *dir) Readdir(count int) ([]os.FileInfo, error) {
-	if d.files == nil {
-		aos, err := d.fs.ab.ListAddressObjects()
-		if err != nil {
-			return nil, err
-		}
-
-		d.files = make([]os.FileInfo, len(aos))
-		for i, ao := range aos {
-			f := &file{
-				fs: d.fs,
-				name: ao.ID() + ".vcf",
-				ao: ao,
-			}
-
-			info, err := f.Stat()
-			if err != nil {
-				return nil, err
-			}
-
-			d.files[i] = info
-		}
-	}
-
-	if count == 0 {
-		count = len(d.files) - d.n
-	}
-	if d.n >= len(d.files) {
-		return nil, nil
-	}
-
-	from := d.n
-	d.n += count
-	if d.n > len(d.files) {
-		d.n = len(d.files)
-	}
-
-	return d.files[from:d.n], nil
-}
-
-func (d *dir) Stat() (os.FileInfo, error) {
-	return &fileInfo{
-		name: d.name,
-		mode: os.ModeDir | os.ModePerm,
-	}, nil
-}
-
-func (d *dir) DeadProps() (map[xml.Name]webdav.Property, error) {
-	info, err := d.fs.ab.Info()
-	if err != nil {
-		return nil, err
-	}
-
-	return map[xml.Name]webdav.Property{
-		resourcetype: webdav.Property{
-			XMLName: resourcetype,
-			InnerXML: []byte(`<collection xmlns="DAV:"/><addressbook xmlns="urn:ietf:params:xml:ns:carddav"/>`),
-		},
-		displayname: webdav.Property{
-			XMLName: displayname,
-			InnerXML: []byte(info.Name),
-		},
-		addressBookDescription: webdav.Property{
-			XMLName: addressBookDescription,
-			InnerXML: []byte(info.Description),
-		},
-		addressBookSupportedAddressData: webdav.Property{
-			XMLName: addressBookSupportedAddressData,
-			InnerXML: []byte(`<address-data-type xmlns="urn:ietf:params:xml:ns:carddav" content-type="text/vcard" version="3.0"/>` +
-				`<address-data-type xmlns="urn:ietf:params:xml:ns:carddav" content-type="text/vcard" version="4.0"/>`),
-		},
-		addressBookMaxResourceSize: webdav.Property{
-			XMLName: addressBookMaxResourceSize,
-			InnerXML: []byte(strconv.Itoa(info.MaxResourceSize)),
-		},
-		addressBookHomeSet: webdav.Property{
-			XMLName: addressBookHomeSet,
-			InnerXML: []byte(`<href xmlns="DAV:">/</href>`),
-		},
-	}, nil
-}
-
-func (d *dir) Patch([]webdav.Proppatch) ([]webdav.Propstat, error) {
-	return nil, errUnsupported
-}
-
-type fileSystem struct {
-	ab AddressBook
-}
-
-func (fs *fileSystem) Mkdir(ctx context.Context, name string, perm os.FileMode) error {
-	return errNotYetImplemented
-}
-
-func (fs *fileSystem) addressObjectID(name string) string {
-	return strings.TrimRight(strings.TrimLeft(name, "/"), ".vcf")
-}
-
-func (fs *fileSystem) OpenFile(ctx context.Context, name string, flag int, perm os.FileMode) (webdav.File, error) {
-	if name == "/" {
-		return &dir{
-			fs: fs,
-			name: name,
-		}, nil
-	}
-
-	id := fs.addressObjectID(name)
-	ao, err := fs.ab.GetAddressObject(id)
-	if err != nil {
-		return nil, err
-	}
-
-	return &file{
-		fs: fs,
-		name: name,
-		ao: ao,
-	}, nil
-}
-
-func (fs *fileSystem) RemoveAll(ctx context.Context, name string) error {
-	return errNotYetImplemented
-}
-
-func (fs *fileSystem) Rename(ctx context.Context, oldName, newName string) error {
-	return errNotYetImplemented
-}
-
-func (fs *fileSystem) Stat(ctx context.Context, name string) (os.FileInfo, error) {
-	if name == "/" {
-		return &fileInfo{
-			name: name,
-			mode: os.ModeDir | os.ModePerm,
-		}, nil
-	}
-
-	id := fs.addressObjectID(name)
-	ao, err := fs.ab.GetAddressObject(id)
-	if err != nil {
-		return nil, err
-	}
-
-	info, err := ao.Stat()
-	if info != nil || err != nil {
-		return info, err
-	}
-
-	return &fileInfo{
-		name: name,
-		mode: os.ModePerm,
-	}, nil
-}
-
-type Handler struct {
-	webdav *webdav.Handler
-}
-
-func NewHandler(ab AddressBook) *Handler {
-	return &Handler{&webdav.Handler{
-		FileSystem: &fileSystem{ab},
-		Logger: func(req *http.Request, err error) {
-			if err != nil {
-				log.Println("ERROR", req, err)
-			}
-		},
-	}}
-}
+var addressDataName = xml.Name{Space: "urn:ietf:params:xml:ns:carddav", Local: "address-data"}
 
 type responseWriter struct {
 	http.ResponseWriter
@@ -333,11 +27,162 @@ func (w responseWriter) Write(b []byte) (int, error) {
 	return w.ResponseWriter.Write(b)
 }
 
-func (h *Handler) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
-	log.Printf("%+v\n", req)
-	if req.Method == http.MethodOptions {
-		resp.Header().Add("DAV", "addressbook")
-	}
-	//h.webdav.ServeHTTP(resp, req)
-	h.webdav.ServeHTTP(responseWriter{resp}, req)
+type Handler struct {
+	ab AddressBook
+	webdav *webdav.Handler
+}
+
+func NewHandler(ab AddressBook) *Handler {
+	return &Handler{
+		ab: ab,
+		webdav: &webdav.Handler{
+			FileSystem: &fileSystem{ab},
+			Logger: func(req *http.Request, err error) {
+				if err != nil {
+					log.Println("ERROR", req, err)
+				}
+			},
+		},
+	}
+}
+
+func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	log.Printf("%+v\n", r)
+	if r.Method == http.MethodOptions {
+		w.Header().Add("DAV", "addressbook")
+	}
+
+	w = responseWriter{w}
+	switch r.Method {
+	case "REPORT":
+		status, _ := h.handleReport(w, r)
+		if status != 0 {
+			w.WriteHeader(status)
+		}
+	case "OPTIONS":
+		w.Header().Add("Allow", "REPORT")
+		fallthrough
+	default:
+		h.webdav.ServeHTTP(w, r)
+	}
+}
+
+func (h *Handler) handleReport(w http.ResponseWriter, r *http.Request) (int, error) {
+	var mg addressbookMultiget
+	if err := xml.NewDecoder(r.Body).Decode(&mg); err != nil {
+		return http.StatusBadRequest, err
+	}
+	log.Printf("%#v\n", mg)
+
+	mw := webdav.NewMultistatusWriter(w)
+	defer mw.Close()
+
+	if len(mg.Href) == 0 {
+		mg.Href = []string{r.URL.Path}
+	}
+	for _, href := range mg.Href {
+		pstats, status, _ := multiget(r.Context(), h.webdav.FileSystem, h.webdav.LockSystem, href, []xml.Name(mg.Prop), mg.Allprop != nil)
+		// TODO: error handling
+
+		resp := &webdav.Response{
+			Href:     []string{(&url.URL{Path: href}).EscapedPath()},
+			Status:   status,
+			Propstat: pstats,
+		}
+
+		if err := mw.Write(resp); err != nil {
+			return http.StatusInternalServerError, err
+		}
+	}
+
+	return 0, nil
+}
+
+func multiget(ctx context.Context, fs webdav.FileSystem, ls webdav.LockSystem, name string, pnames []xml.Name, allprop bool) ([]webdav.Propstat, int, error) {
+	wantAddressData := false
+	for i, pname := range pnames {
+		if pname == addressDataName {
+			pnames = append(pnames[:i], pnames[i+1:]...)
+			wantAddressData = true
+			break
+		}
+	}
+
+	var pstats []webdav.Propstat
+	var err error
+	if allprop {
+		wantAddressData = true
+		pstats, err = webdav.Allprop(ctx, fs, ls, name, pnames)
+	} else {
+		pstats, err = webdav.Props(ctx, fs, ls, name, pnames)
+	}
+	if err != nil {
+		return pstats, http.StatusInternalServerError, err
+	}
+
+	// TODO: locking stuff
+
+	f, err := fs.OpenFile(ctx, name, os.O_RDONLY, 0)
+	if err != nil {
+		return nil, http.StatusNotFound, err
+	}
+	defer f.Close()
+	fi, err := f.Stat()
+	if err != nil {
+		return nil, http.StatusNotFound, err
+	}
+
+	if wantAddressData {
+		if fi.IsDir() {
+			// TODO
+			return nil, http.StatusNotFound, err
+		}
+
+		prop, status, _ := addressdata(f.(*file).ao)
+		if status == 0 {
+			status = http.StatusOK
+		}
+
+		inserted := false
+		for i, pstat := range pstats {
+			if pstat.Status == status {
+				pstats[i].Props = append(pstat.Props, prop)
+				inserted = true
+				break
+			}
+		}
+
+		if !inserted {
+			pstats = append(pstats, webdav.Propstat{
+				Props: []webdav.Property{prop},
+				Status: status,
+			})
+		}
+	}
+
+	return pstats, 0, nil
+}
+
+func addressdata(ao AddressObject) (webdav.Property, int, error) {
+	prop := webdav.Property{XMLName: addressDataName}
+
+	card, err := ao.Card()
+	if err != nil {
+		return prop, http.StatusInternalServerError, err
+	}
+
+	// TODO: restrict to requested props
+
+	var b bytes.Buffer
+	if err := vcard.NewEncoder(&b).Encode(card); err != nil {
+		return prop, http.StatusInternalServerError, err
+	}
+
+	var escaped bytes.Buffer
+	if err := xml.EscapeText(&escaped, b.Bytes()); err != nil {
+		return prop, http.StatusInternalServerError, err
+	}
+
+	prop.InnerXML = escaped.Bytes()
+	return prop, 0, nil
 }

carddav/fs.go

@@ -0,0 +1,307 @@
+// Package carddav provides a CardDAV server implementation, as defined in
+// RFC 6352.
+package carddav
+
+import (
+	"bytes"
+	"encoding/xml"
+	"errors"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/emersion/go-vcard"
+	"github.com/emersion/go-webdav"
+	"golang.org/x/net/context"
+)
+
+var (
+	errNotYetImplemented = errors.New("not yet implemented")
+	errUnsupported = errors.New("unsupported")
+)
+
+const nsDAV = "DAV:"
+
+var (
+	resourcetype = xml.Name{Space: nsDAV, Local: "resourcetype"}
+	displayname = xml.Name{Space: nsDAV, Local: "displayname"}
+	getcontenttype = xml.Name{Space: nsDAV, Local: "getcontenttype"}
+)
+
+const nsCardDAV = "urn:ietf:params:xml:ns:carddav"
+
+var (
+	addressBookDescription = xml.Name{Space: nsCardDAV, Local: "addressbook-description"}
+	addressBookSupportedAddressData = xml.Name{Space: nsCardDAV, Local: "supported-address-data"}
+	addressBookMaxResourceSize = xml.Name{Space: nsCardDAV, Local: "max-resource-size"}
+	addressBookHomeSet = xml.Name{Space: nsCardDAV, Local: "addressbook-home-set"}
+)
+
+type fileInfo struct {
+	name string
+	size int64
+	mode os.FileMode
+	modTime time.Time
+}
+
+func (fi *fileInfo) Name() string {
+	return fi.name
+}
+
+func (fi *fileInfo) Size() int64 {
+	return fi.size
+}
+
+func (fi *fileInfo) Mode() os.FileMode {
+	return fi.mode
+}
+
+func (fi *fileInfo) ModTime() time.Time {
+	return fi.modTime
+}
+
+func (fi *fileInfo) IsDir() bool {
+	return fi.mode.IsDir()
+}
+
+func (fi *fileInfo) Sys() interface{} {
+	return nil
+}
+
+type file struct {
+	*bytes.Reader
+	fs *fileSystem
+	name string
+	ao AddressObject
+}
+
+func (f *file) Close() error {
+	return nil
+}
+
+func (f *file) Read(b []byte) (int, error) {
+	if f.Reader == nil {
+		card, err := f.ao.Card()
+		if err != nil {
+			return 0, err
+		}
+
+		var b bytes.Buffer
+		if err := vcard.NewEncoder(&b).Encode(card); err != nil {
+			return 0, err
+		}
+
+		f.Reader = bytes.NewReader(b.Bytes())
+	}
+
+	return f.Reader.Read(b)
+}
+
+func (f *file) Write(b []byte) (int, error) {
+	return 0, errUnsupported
+}
+
+func (f *file) Seek(offset int64, whence int) (int64, error) {
+	if f.Reader == nil {
+		if _, err := f.Read(nil); err != nil {
+			return 0, err
+		}
+	}
+
+	return f.Reader.Seek(offset, whence)
+}
+
+func (f *file) Readdir(count int) ([]os.FileInfo, error) {
+	return nil, errUnsupported
+}
+
+func (f *file) Stat() (os.FileInfo, error) {
+	info, err := f.ao.Stat()
+	if info != nil || err != nil {
+		return info, err
+	}
+
+	return &fileInfo{
+		name: f.name,
+		mode: os.ModePerm,
+	}, nil
+}
+
+// TODO: getcontenttype for file
+
+type dir struct {
+	fs *fileSystem
+	name string
+	files []os.FileInfo
+
+	n int
+}
+
+func (d *dir) Close() error {
+	return nil
+}
+
+func (d *dir) Read(b []byte) (int, error) {
+	return 0, errUnsupported
+}
+
+func (d *dir) Write(b []byte) (int, error) {
+	return 0, errUnsupported
+}
+
+func (d *dir) Seek(offset int64, whence int) (int64, error) {
+	return 0, errUnsupported
+}
+
+func (d *dir) Readdir(count int) ([]os.FileInfo, error) {
+	if d.files == nil {
+		aos, err := d.fs.ab.ListAddressObjects()
+		if err != nil {
+			return nil, err
+		}
+
+		d.files = make([]os.FileInfo, len(aos))
+		for i, ao := range aos {
+			f := &file{
+				fs: d.fs,
+				name: ao.ID() + ".vcf",
+				ao: ao,
+			}
+
+			info, err := f.Stat()
+			if err != nil {
+				return nil, err
+			}
+
+			d.files[i] = info
+		}
+	}
+
+	if count == 0 {
+		count = len(d.files) - d.n
+	}
+	if d.n >= len(d.files) {
+		return nil, nil
+	}
+
+	from := d.n
+	d.n += count
+	if d.n > len(d.files) {
+		d.n = len(d.files)
+	}
+
+	return d.files[from:d.n], nil
+}
+
+func (d *dir) Stat() (os.FileInfo, error) {
+	return &fileInfo{
+		name: d.name,
+		mode: os.ModeDir | os.ModePerm,
+	}, nil
+}
+
+func (d *dir) DeadProps() (map[xml.Name]webdav.Property, error) {
+	info, err := d.fs.ab.Info()
+	if err != nil {
+		return nil, err
+	}
+
+	return map[xml.Name]webdav.Property{
+		resourcetype: webdav.Property{
+			XMLName: resourcetype,
+			InnerXML: []byte(`<collection xmlns="DAV:"/><addressbook xmlns="urn:ietf:params:xml:ns:carddav"/>`),
+		},
+		displayname: webdav.Property{
+			XMLName: displayname,
+			InnerXML: []byte(info.Name),
+		},
+		addressBookDescription: webdav.Property{
+			XMLName: addressBookDescription,
+			InnerXML: []byte(info.Description),
+		},
+		addressBookSupportedAddressData: webdav.Property{
+			XMLName: addressBookSupportedAddressData,
+			InnerXML: []byte(`<address-data-type xmlns="urn:ietf:params:xml:ns:carddav" content-type="text/vcard" version="3.0"/>` +
+				`<address-data-type xmlns="urn:ietf:params:xml:ns:carddav" content-type="text/vcard" version="4.0"/>`),
+		},
+		addressBookMaxResourceSize: webdav.Property{
+			XMLName: addressBookMaxResourceSize,
+			InnerXML: []byte(strconv.Itoa(info.MaxResourceSize)),
+		},
+		addressBookHomeSet: webdav.Property{
+			XMLName: addressBookHomeSet,
+			InnerXML: []byte(`<href xmlns="DAV:">/</href>`),
+		},
+	}, nil
+}
+
+func (d *dir) Patch([]webdav.Proppatch) ([]webdav.Propstat, error) {
+	return nil, errUnsupported
+}
+
+type fileSystem struct {
+	ab AddressBook
+}
+
+func (fs *fileSystem) Mkdir(ctx context.Context, name string, perm os.FileMode) error {
+	return errNotYetImplemented
+}
+
+func (fs *fileSystem) addressObjectID(name string) string {
+	return strings.TrimRight(strings.TrimLeft(name, "/"), ".vcf")
+}
+
+func (fs *fileSystem) OpenFile(ctx context.Context, name string, flag int, perm os.FileMode) (webdav.File, error) {
+	if name == "/" {
+		return &dir{
+			fs: fs,
+			name: name,
+		}, nil
+	}
+
+	id := fs.addressObjectID(name)
+	ao, err := fs.ab.GetAddressObject(id)
+	if err != nil {
+		return nil, err
+	}
+
+	return &file{
+		fs: fs,
+		name: name,
+		ao: ao,
+	}, nil
+}
+
+func (fs *fileSystem) RemoveAll(ctx context.Context, name string) error {
+	return errNotYetImplemented
+}
+
+func (fs *fileSystem) Rename(ctx context.Context, oldName, newName string) error {
+	return errNotYetImplemented
+}
+
+func (fs *fileSystem) Stat(ctx context.Context, name string) (os.FileInfo, error) {
+	if name == "/" {
+		return &fileInfo{
+			name: name,
+			mode: os.ModeDir | os.ModePerm,
+		}, nil
+	}
+
+	id := fs.addressObjectID(name)
+	ao, err := fs.ab.GetAddressObject(id)
+	if err != nil {
+		return nil, err
+	}
+
+	info, err := ao.Stat()
+	if info != nil || err != nil {
+		return info, err
+	}
+
+	return &fileInfo{
+		name: name,
+		mode: os.ModePerm,
+	}, nil
+}

carddav/xml.go

@@ -0,0 +1,24 @@
+package carddav
+
+import (
+	"encoding/xml"
+
+	"github.com/emersion/go-webdav"
+)
+
+// https://tools.ietf.org/html/rfc6352#section-10.7
+type addressbookMultiget struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:carddav addressbook-multiget"`
+	Allprop  *struct{}     `xml:"DAV: allprop"`
+	Propname *struct{}     `xml:"DAV: propname"`
+	Prop     webdav.PropfindProps `xml:"DAV: prop"`
+	Href      []string   `xml:"DAV: href"`
+}
+
+// TODO
+type addressData struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:carddav address-data"`
+	ContentType string `xml:"content-type,attr"`
+	Version string `xml:"version,attr"`
+	Prop []string `xml:"prop>name,attr"`
+}

prop.go

@@ -160,13 +160,11 @@ var liveProps = map[xml.Name]struct {
 	},
 }
 
-// TODO(nigeltao) merge props and allprop?
-
 // Props returns the status of the properties named pnames for resource name.
 //
 // Each Propstat has a unique status and each property name will only be part
 // of one Propstat element.
-func props(ctx context.Context, fs FileSystem, ls LockSystem, name string, pnames []xml.Name) ([]Propstat, error) {
+func Props(ctx context.Context, fs FileSystem, ls LockSystem, name string, pnames []xml.Name) ([]Propstat, error) {
 	f, err := fs.OpenFile(ctx, name, os.O_RDONLY, 0)
 	if err != nil {
 		return nil, err
@@ -254,7 +252,7 @@ func propnames(ctx context.Context, fs FileSystem, ls LockSystem, name string) (
 // returned if they are named in 'include'.
 //
 // See http://www.webdav.org/specs/rfc4918.html#METHOD_PROPFIND
-func allprop(ctx context.Context, fs FileSystem, ls LockSystem, name string, include []xml.Name) ([]Propstat, error) {
+func Allprop(ctx context.Context, fs FileSystem, ls LockSystem, name string, include []xml.Name) ([]Propstat, error) {
 	pnames, err := propnames(ctx, fs, ls, name)
 	if err != nil {
 		return nil, err
@@ -269,7 +267,7 @@ func allprop(ctx context.Context, fs FileSystem, ls LockSystem, name string, inc
 			pnames = append(pnames, pn)
 		}
 	}
-	return props(ctx, fs, ls, name, pnames)
+	return Props(ctx, fs, ls, name, pnames)
 }
 
 // Patch patches the properties of resource name. The return values are

prop_test.go

@@ -534,9 +534,9 @@ func TestMemPS(t *testing.T) {
 				}
 				continue
 			case "allprop":
-				propstats, err = allprop(ctx, fs, ls, op.name, op.pnames)
+				propstats, err = Allprop(ctx, fs, ls, op.name, op.pnames)
 			case "propfind":
-				propstats, err = props(ctx, fs, ls, op.name, op.pnames)
+				propstats, err = Props(ctx, fs, ls, op.name, op.pnames)
 			case "proppatch":
 				propstats, err = patch(ctx, fs, ls, op.name, op.patches)
 			default:

webdav.go

@@ -577,9 +577,9 @@ func (h *Handler) handlePropfind(w http.ResponseWriter, r *http.Request) (status
 			}
 			pstats = append(pstats, pstat)
 		} else if pf.Allprop != nil {
-			pstats, err = allprop(ctx, h.FileSystem, h.LockSystem, reqPath, pf.Prop)
+			pstats, err = Allprop(ctx, h.FileSystem, h.LockSystem, reqPath, pf.Prop)
 		} else {
-			pstats, err = props(ctx, h.FileSystem, h.LockSystem, reqPath, pf.Prop)
+			pstats, err = Props(ctx, h.FileSystem, h.LockSystem, reqPath, pf.Prop)
 		}
 		if err != nil {
 			return err

xml.go

@@ -115,13 +115,13 @@ func next(d *xml.Decoder) (xml.Token, error) {
 }
 
 // http://www.webdav.org/specs/rfc4918.html#ELEMENT_prop (for propfind)
-type propfindProps []xml.Name
+type PropfindProps []xml.Name
 
 // UnmarshalXML appends the property names enclosed within start to pn.
 //
 // It returns an error if start does not contain any properties or if
 // properties contain values. Character data between properties is ignored.
-func (pn *propfindProps) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+func (pn *PropfindProps) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
 	for {
 		t, err := next(d)
 		if err != nil {
@@ -152,8 +152,8 @@ type propfind struct {
 	XMLName  xml.Name      `xml:"DAV: propfind"`
 	Allprop  *struct{}     `xml:"DAV: allprop"`
 	Propname *struct{}     `xml:"DAV: propname"`
-	Prop     propfindProps `xml:"DAV: prop"`
-	Include  propfindProps `xml:"DAV: include"`
+	Prop     PropfindProps `xml:"DAV: prop"`
+	Include  PropfindProps `xml:"DAV: include"`
 }
 
 func readPropfind(r io.Reader) (pf propfind, status int, err error) {
@@ -246,12 +246,16 @@ type MultistatusWriter struct {
 	// of the multistatus XML element. Only the latest content before
 	// close will be emitted. Empty response descriptions are not
 	// written.
-	responseDescription string
+	ResponseDescription string
 
 	w   http.ResponseWriter
 	enc *xml.Encoder
 }
 
+func NewMultistatusWriter(w http.ResponseWriter) *MultistatusWriter {
+	return &MultistatusWriter{w: w}
+}
+
 // Write validates and emits a DAV response as part of a multistatus response
 // element.
 //
@@ -337,11 +341,11 @@ func (w *MultistatusWriter) Close() error {
 		return nil
 	}
 	var end []xml.Token
-	if w.responseDescription != "" {
+	if w.ResponseDescription != "" {
 		name := xml.Name{Space: "DAV:", Local: "responsedescription"}
 		end = append(end,
 			xml.StartElement{Name: name},
-			xml.CharData(w.responseDescription),
+			xml.CharData(w.ResponseDescription),
 			xml.EndElement{Name: name},
 		)
 	}

xml_test.go

@@ -175,7 +175,7 @@ func TestReadPropfind(t *testing.T) {
 		wantPF: propfind{
 			XMLName: xml.Name{Space: "DAV:", Local: "propfind"},
 			Allprop: new(struct{}),
-			Include: propfindProps{xml.Name{Space: "DAV:", Local: "displayname"}},
+			Include: PropfindProps{xml.Name{Space: "DAV:", Local: "displayname"}},
 		},
 	}, {
 		desc: "propfind: include followed by allprop",
@@ -187,7 +187,7 @@ func TestReadPropfind(t *testing.T) {
 		wantPF: propfind{
 			XMLName: xml.Name{Space: "DAV:", Local: "propfind"},
 			Allprop: new(struct{}),
-			Include: propfindProps{xml.Name{Space: "DAV:", Local: "displayname"}},
+			Include: PropfindProps{xml.Name{Space: "DAV:", Local: "displayname"}},
 		},
 	}, {
 		desc: "propfind: propfind",
@@ -197,7 +197,7 @@ func TestReadPropfind(t *testing.T) {
 			"</A:propfind>",
 		wantPF: propfind{
 			XMLName: xml.Name{Space: "DAV:", Local: "propfind"},
-			Prop:    propfindProps{xml.Name{Space: "DAV:", Local: "displayname"}},
+			Prop:    PropfindProps{xml.Name{Space: "DAV:", Local: "displayname"}},
 		},
 	}, {
 		desc: "propfind: prop with ignored comments",
@@ -210,7 +210,7 @@ func TestReadPropfind(t *testing.T) {
 			"</A:propfind>",
 		wantPF: propfind{
 			XMLName: xml.Name{Space: "DAV:", Local: "propfind"},
-			Prop:    propfindProps{xml.Name{Space: "DAV:", Local: "displayname"}},
+			Prop:    PropfindProps{xml.Name{Space: "DAV:", Local: "displayname"}},
 		},
 	}, {
 		desc: "propfind: propfind with ignored whitespace",
@@ -220,7 +220,7 @@ func TestReadPropfind(t *testing.T) {
 			"</A:propfind>",
 		wantPF: propfind{
 			XMLName: xml.Name{Space: "DAV:", Local: "propfind"},
-			Prop:    propfindProps{xml.Name{Space: "DAV:", Local: "displayname"}},
+			Prop:    PropfindProps{xml.Name{Space: "DAV:", Local: "displayname"}},
 		},
 	}, {
 		desc: "propfind: propfind with ignored mixed-content",
@@ -230,7 +230,7 @@ func TestReadPropfind(t *testing.T) {
 			"</A:propfind>",
 		wantPF: propfind{
 			XMLName: xml.Name{Space: "DAV:", Local: "propfind"},
-			Prop:    propfindProps{xml.Name{Space: "DAV:", Local: "displayname"}},
+			Prop:    PropfindProps{xml.Name{Space: "DAV:", Local: "displayname"}},
 		},
 	}, {
 		desc: "propfind: propname with ignored element (section A.4)",
@@ -564,7 +564,7 @@ func TestMultistatusWriter(t *testing.T) {
 loop:
 	for _, tc := range testCases {
 		rec := httptest.NewRecorder()
-		w := MultistatusWriter{w: rec, responseDescription: tc.respdesc}
+		w := MultistatusWriter{w: rec, ResponseDescription: tc.respdesc}
 		if tc.writeHeader {
 			if err := w.writeHeader(); err != nil {
 				t.Errorf("%s: got writeHeader error %v, want nil", tc.desc, err)