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nextcloud.go
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nextcloud.go
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// Package nextcloud is a client library for NextCloud. It only supports files
// via Webdav for the moment.
package nextcloud
import (
"encoding/json"
"io"
"net/http"
"net/url"
"path/filepath"
"runtime"
"strconv"
"time"
"github.com/cozy/cozy-stack/model/account"
"github.com/cozy/cozy-stack/model/instance"
"github.com/cozy/cozy-stack/model/vfs"
build "github.com/cozy/cozy-stack/pkg/config"
"github.com/cozy/cozy-stack/pkg/consts"
"github.com/cozy/cozy-stack/pkg/couchdb"
"github.com/cozy/cozy-stack/pkg/jsonapi"
"github.com/cozy/cozy-stack/pkg/safehttp"
"github.com/cozy/cozy-stack/pkg/webdav"
"github.com/labstack/echo/v4"
)
type OperationKind int
const (
MoveOperation OperationKind = iota
CopyOperation
)
type File struct {
DocID string `json:"id,omitempty"`
Type string `json:"type"`
Name string `json:"name"`
Size uint64 `json:"size,omitempty"`
Mime string `json:"mime,omitempty"`
Class string `json:"class,omitempty"`
UpdatedAt string `json:"updated_at,omitempty"`
ETag string `json:"etag,omitempty"`
url string
}
func (f *File) ID() string { return f.DocID }
func (f *File) Rev() string { return "" }
func (f *File) DocType() string { return consts.NextCloudFiles }
func (f *File) SetID(id string) { f.DocID = id }
func (f *File) SetRev(id string) {}
func (f *File) Clone() couchdb.Doc { panic("nextcloud.File should not be cloned") }
func (f *File) Included() []jsonapi.Object { return nil }
func (f *File) Relationships() jsonapi.RelationshipMap { return nil }
func (f *File) Links() *jsonapi.LinksList {
return &jsonapi.LinksList{
Self: f.url,
}
}
var _ jsonapi.Object = (*File)(nil)
type NextCloud struct {
inst *instance.Instance
accountID string
userID string
webdav *webdav.Client
}
func New(inst *instance.Instance, accountID string) (*NextCloud, error) {
var doc couchdb.JSONDoc
err := couchdb.GetDoc(inst, consts.Accounts, accountID, &doc)
if err != nil {
if couchdb.IsNotFoundError(err) {
return nil, ErrAccountNotFound
}
return nil, err
}
account.Decrypt(doc)
if doc.M == nil || doc.M["account_type"] != "nextcloud" {
return nil, ErrInvalidAccount
}
auth, ok := doc.M["auth"].(map[string]interface{})
if !ok {
return nil, ErrInvalidAccount
}
ncURL, _ := auth["url"].(string)
if ncURL == "" {
return nil, ErrInvalidAccount
}
u, err := url.Parse(ncURL)
if err != nil {
return nil, ErrInvalidAccount
}
username, _ := auth["login"].(string)
password, _ := auth["password"].(string)
logger := inst.Logger().WithNamespace("nextcloud")
webdav := &webdav.Client{
Scheme: u.Scheme,
Host: u.Host,
Username: username,
Password: password,
BasePath: "/remote.php/dav",
Logger: logger,
}
nc := &NextCloud{
inst: inst,
accountID: accountID,
webdav: webdav,
}
if err := nc.fillUserID(&doc); err != nil {
return nil, err
}
return nc, nil
}
func (nc *NextCloud) Download(path string) (*webdav.Download, error) {
return nc.webdav.Get("/files/" + nc.userID + "/" + path)
}
func (nc *NextCloud) Upload(path, mime string, contentLength int64, body io.Reader) error {
headers := map[string]string{
echo.HeaderContentType: mime,
}
path = "/files/" + nc.userID + "/" + path
return nc.webdav.Put(path, contentLength, headers, body)
}
func (nc *NextCloud) Mkdir(path string) error {
return nc.webdav.Mkcol("/files/" + nc.userID + "/" + path)
}
func (nc *NextCloud) Delete(path string) error {
return nc.webdav.Delete("/files/" + nc.userID + "/" + path)
}
func (nc *NextCloud) Move(oldPath, newPath string) error {
oldPath = "/files/" + nc.userID + "/" + oldPath
newPath = "/files/" + nc.userID + "/" + newPath
return nc.webdav.Move(oldPath, newPath)
}
func (nc *NextCloud) Copy(oldPath, newPath string) error {
oldPath = "/files/" + nc.userID + "/" + oldPath
newPath = "/files/" + nc.userID + "/" + newPath
return nc.webdav.Copy(oldPath, newPath)
}
func (nc *NextCloud) Restore(path string) error {
path = "/trashbin/" + nc.userID + "/" + path
dst := "/trashbin/" + nc.userID + "/restore/" + filepath.Base(path)
return nc.webdav.Move(path, dst)
}
func (nc *NextCloud) EmptyTrash() error {
return nc.webdav.Delete("/trashbin/" + nc.userID + "/trash")
}
func (nc *NextCloud) ListFiles(path string) ([]jsonapi.Object, error) {
items, err := nc.webdav.List("/files/" + nc.userID + "/" + path)
if err != nil {
return nil, err
}
var files []jsonapi.Object
for _, item := range items {
var mime, class string
if item.Type == "file" {
mime, class = vfs.ExtractMimeAndClassFromFilename(item.Name)
}
file := &File{
DocID: item.ID,
Type: item.Type,
Name: item.Name,
Size: item.Size,
Mime: mime,
Class: class,
UpdatedAt: item.LastModified,
ETag: item.ETag,
url: nc.buildURL(item, path),
}
files = append(files, file)
}
return files, nil
}
func (nc *NextCloud) ListTrash(path string) ([]jsonapi.Object, error) {
items, err := nc.webdav.List("/trashbin/" + nc.userID + "/trash/" + path)
if err != nil {
return nil, err
}
var files []jsonapi.Object
for _, item := range items {
var mime, class string
if item.Type == "file" {
mime, class = vfs.ExtractMimeAndClassFromFilename(item.TrashName)
}
file := &File{
DocID: item.ID,
Type: item.Type,
Name: item.TrashName,
Size: item.Size,
Mime: mime,
Class: class,
UpdatedAt: item.LastModified,
ETag: item.ETag,
url: nc.buildTrashURL(item, path),
}
files = append(files, file)
}
return files, nil
}
func (nc *NextCloud) Downstream(path, dirID string, kind OperationKind, cozyMetadata *vfs.FilesCozyMetadata) (*vfs.FileDoc, error) {
path = "/files/" + nc.userID + "/" + path
dl, err := nc.webdav.Get(path)
if err != nil {
return nil, err
}
defer dl.Content.Close()
size, _ := strconv.Atoi(dl.Length)
mime, class := vfs.ExtractMimeAndClass(dl.Mime)
doc, err := vfs.NewFileDoc(
filepath.Base(path),
dirID,
int64(size),
nil, // md5sum
mime,
class,
time.Now(),
false, // executable
false, // trashed
false, // encrypted
nil, // tags
)
if err != nil {
return nil, err
}
doc.CozyMetadata = cozyMetadata
fs := nc.inst.VFS()
file, err := fs.CreateFile(doc, nil)
if err != nil {
return nil, err
}
_, err = io.Copy(file, dl.Content)
if cerr := file.Close(); err == nil && cerr != nil {
return nil, cerr
}
if err != nil {
return nil, err
}
if kind == MoveOperation {
_ = nc.webdav.Delete(path)
}
return doc, nil
}
func (nc *NextCloud) Upstream(path, from string, kind OperationKind) error {
path = "/files/" + nc.userID + "/" + path
fs := nc.inst.VFS()
doc, err := fs.FileByID(from)
if err != nil {
return err
}
f, err := fs.OpenFile(doc)
if err != nil {
return err
}
defer f.Close()
headers := map[string]string{
echo.HeaderContentType: doc.Mime,
}
if err := nc.webdav.Put(path, doc.ByteSize, headers, f); err != nil {
return err
}
if kind == MoveOperation {
_ = fs.DestroyFile(doc)
}
return nil
}
func (nc *NextCloud) fillUserID(accountDoc *couchdb.JSONDoc) error {
userID, _ := accountDoc.M["webdav_user_id"].(string)
if userID != "" {
nc.userID = userID
return nil
}
userID, err := nc.fetchUserID()
if err != nil {
return err
}
nc.userID = userID
// Try to persist the userID to avoid fetching it for every WebDAV request
accountDoc.M["webdav_user_id"] = userID
accountDoc.Type = consts.Accounts
account.Encrypt(*accountDoc)
_ = couchdb.UpdateDoc(nc.inst, accountDoc)
return nil
}
func (nc *NextCloud) buildURL(item webdav.Item, path string) string {
u := &url.URL{
Scheme: nc.webdav.Scheme,
Host: nc.webdav.Host,
Path: "/apps/files/files/" + item.ID,
RawQuery: "dir=/" + path,
}
return u.String()
}
func (nc *NextCloud) buildTrashURL(item webdav.Item, path string) string {
u := &url.URL{
Scheme: nc.webdav.Scheme,
Host: nc.webdav.Host,
Path: "/apps/files/trashbin/" + item.ID,
RawQuery: "dir=/" + path,
}
return u.String()
}
// https://docs.nextcloud.com/server/latest/developer_manual/client_apis/OCS/ocs-status-api.html#fetch-your-own-status
func (nc *NextCloud) fetchUserID() (string, error) {
logger := nc.webdav.Logger
u := url.URL{
Scheme: nc.webdav.Scheme,
Host: nc.webdav.Host,
User: url.UserPassword(nc.webdav.Username, nc.webdav.Password),
Path: "/ocs/v2.php/apps/user_status/api/v1/user_status",
}
req, err := http.NewRequest(http.MethodGet, u.String(), nil)
if err != nil {
return "", err
}
req.Header.Set("User-Agent", "cozy-stack "+build.Version+" ("+runtime.Version()+")")
req.Header.Set("OCS-APIRequest", "true")
req.Header.Set("Accept", "application/json")
start := time.Now()
res, err := safehttp.ClientWithKeepAlive.Do(req)
elapsed := time.Since(start)
if err != nil {
logger.Warnf("user_status %s: %s (%s)", u.Host, err, elapsed)
return "", err
}
defer res.Body.Close()
logger.Infof("user_status %s: %d (%s)", u.Host, res.StatusCode, elapsed)
if res.StatusCode != 200 {
return "", webdav.ErrInvalidAuth
}
var payload OCSPayload
if err := json.NewDecoder(res.Body).Decode(&payload); err != nil {
logger.Warnf("cannot fetch NextCloud userID: %s", err)
return "", err
}
return payload.OCS.Data.UserID, nil
}
type OCSPayload struct {
OCS struct {
Data struct {
UserID string `json:"userId"`
} `json:"data"`
} `json:"ocs"`
}