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gui.go
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gui.go
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// Copyright (C) 2014 Jakob Borg and Contributors (see the CONTRIBUTORS file).
// All rights reserved. Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
package main
import (
"bytes"
"crypto/tls"
"encoding/base64"
"encoding/json"
"fmt"
"io/ioutil"
"math/rand"
"mime"
"net"
"net/http"
"os"
"path/filepath"
"reflect"
"runtime"
"strconv"
"strings"
"sync"
"time"
"code.google.com/p/go.crypto/bcrypt"
"github.com/syncthing/syncthing/auto"
"github.com/syncthing/syncthing/config"
"github.com/syncthing/syncthing/events"
"github.com/syncthing/syncthing/logger"
"github.com/syncthing/syncthing/model"
"github.com/syncthing/syncthing/protocol"
"github.com/syncthing/syncthing/upgrade"
"github.com/vitrun/qart/qr"
)
type guiError struct {
Time time.Time
Error string
}
var (
configInSync = true
guiErrors = []guiError{}
guiErrorsMut sync.Mutex
apiKey string
modt = time.Now().UTC().Format(http.TimeFormat)
eventSub *events.BufferedSubscription
)
const (
unchangedPassword = "--password-unchanged--"
)
func init() {
l.AddHandler(logger.LevelWarn, showGuiError)
sub := events.Default.Subscribe(events.AllEvents)
eventSub = events.NewBufferedSubscription(sub, 1000)
}
func startGUI(cfg config.GUIConfiguration, assetDir string, m *model.Model) error {
var listener net.Listener
var err error
if cfg.UseTLS {
cert, err := loadCert(confDir, "https-")
if err != nil {
l.Infoln("Loading HTTPS certificate:", err)
l.Infoln("Creating new HTTPS certificate")
newCertificate(confDir, "https-")
cert, err = loadCert(confDir, "https-")
}
if err != nil {
return err
}
tlsCfg := &tls.Config{
Certificates: []tls.Certificate{cert},
ServerName: "syncthing",
}
listener, err = tls.Listen("tcp", cfg.Address, tlsCfg)
if err != nil {
return err
}
} else {
listener, err = net.Listen("tcp", cfg.Address)
if err != nil {
return err
}
}
apiKey = cfg.APIKey
loadCsrfTokens()
// The GET handlers
getRestMux := http.NewServeMux()
getRestMux.HandleFunc("/rest/completion", withModel(m, restGetCompletion))
getRestMux.HandleFunc("/rest/config", restGetConfig)
getRestMux.HandleFunc("/rest/config/sync", restGetConfigInSync)
getRestMux.HandleFunc("/rest/connections", withModel(m, restGetConnections))
getRestMux.HandleFunc("/rest/discovery", restGetDiscovery)
getRestMux.HandleFunc("/rest/errors", restGetErrors)
getRestMux.HandleFunc("/rest/events", restGetEvents)
getRestMux.HandleFunc("/rest/lang", restGetLang)
getRestMux.HandleFunc("/rest/model", withModel(m, restGetModel))
getRestMux.HandleFunc("/rest/model/version", withModel(m, restGetModelVersion))
getRestMux.HandleFunc("/rest/need", withModel(m, restGetNeed))
getRestMux.HandleFunc("/rest/nodeid", restGetNodeID)
getRestMux.HandleFunc("/rest/report", withModel(m, restGetReport))
getRestMux.HandleFunc("/rest/system", restGetSystem)
getRestMux.HandleFunc("/rest/upgrade", restGetUpgrade)
getRestMux.HandleFunc("/rest/version", restGetVersion)
getRestMux.HandleFunc("/rest/stats/node", withModel(m, restGetNodeStats))
// Debug endpoints, not for general use
getRestMux.HandleFunc("/rest/debug/peerCompletion", withModel(m, restGetPeerCompletion))
// The POST handlers
postRestMux := http.NewServeMux()
postRestMux.HandleFunc("/rest/config", withModel(m, restPostConfig))
postRestMux.HandleFunc("/rest/discovery/hint", restPostDiscoveryHint)
postRestMux.HandleFunc("/rest/error", restPostError)
postRestMux.HandleFunc("/rest/error/clear", restClearErrors)
postRestMux.HandleFunc("/rest/model/override", withModel(m, restPostOverride))
postRestMux.HandleFunc("/rest/reset", restPostReset)
postRestMux.HandleFunc("/rest/restart", restPostRestart)
postRestMux.HandleFunc("/rest/shutdown", restPostShutdown)
postRestMux.HandleFunc("/rest/upgrade", restPostUpgrade)
postRestMux.HandleFunc("/rest/scan", withModel(m, restPostScan))
// A handler that splits requests between the two above and disables
// caching
restMux := noCacheMiddleware(getPostHandler(getRestMux, postRestMux))
// The main routing handler
mux := http.NewServeMux()
mux.Handle("/rest/", restMux)
mux.HandleFunc("/qr/", getQR)
// Serve compiled in assets unless an asset directory was set (for development)
mux.Handle("/", embeddedStatic(assetDir))
// Wrap everything in CSRF protection. The /rest prefix should be
// protected, other requests will grant cookies.
handler := csrfMiddleware("/rest", mux)
// Add our version as a header to responses
handler = withVersionMiddleware(handler)
// Wrap everything in basic auth, if user/password is set.
if len(cfg.User) > 0 {
handler = basicAuthMiddleware(cfg.User, cfg.Password, handler)
}
go http.Serve(listener, handler)
return nil
}
func getPostHandler(get, post http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
switch r.Method {
case "GET":
get.ServeHTTP(w, r)
case "POST":
post.ServeHTTP(w, r)
default:
http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
}
})
}
func noCacheMiddleware(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Cache-Control", "no-cache")
h.ServeHTTP(w, r)
})
}
func withVersionMiddleware(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("X-Syncthing-Version", Version)
h.ServeHTTP(w, r)
})
}
func withModel(m *model.Model, h func(m *model.Model, w http.ResponseWriter, r *http.Request)) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
h(m, w, r)
}
}
func restGetVersion(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(Version))
}
func restGetCompletion(m *model.Model, w http.ResponseWriter, r *http.Request) {
var qs = r.URL.Query()
var repo = qs.Get("repo")
var nodeStr = qs.Get("node")
node, err := protocol.NodeIDFromString(nodeStr)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
res := map[string]float64{
"completion": m.Completion(node, repo),
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
json.NewEncoder(w).Encode(res)
}
func restGetModelVersion(m *model.Model, w http.ResponseWriter, r *http.Request) {
var qs = r.URL.Query()
var repo = qs.Get("repo")
var res = make(map[string]interface{})
res["version"] = m.LocalVersion(repo)
w.Header().Set("Content-Type", "application/json; charset=utf-8")
json.NewEncoder(w).Encode(res)
}
func restGetModel(m *model.Model, w http.ResponseWriter, r *http.Request) {
var qs = r.URL.Query()
var repo = qs.Get("repo")
var res = make(map[string]interface{})
for _, cr := range cfg.Repositories {
if cr.ID == repo {
res["invalid"] = cr.Invalid
break
}
}
globalFiles, globalDeleted, globalBytes := m.GlobalSize(repo)
res["globalFiles"], res["globalDeleted"], res["globalBytes"] = globalFiles, globalDeleted, globalBytes
localFiles, localDeleted, localBytes := m.LocalSize(repo)
res["localFiles"], res["localDeleted"], res["localBytes"] = localFiles, localDeleted, localBytes
needFiles, needBytes := m.NeedSize(repo)
res["needFiles"], res["needBytes"] = needFiles, needBytes
res["inSyncFiles"], res["inSyncBytes"] = globalFiles-needFiles, globalBytes-needBytes
res["state"], res["stateChanged"] = m.State(repo)
res["version"] = m.LocalVersion(repo)
w.Header().Set("Content-Type", "application/json; charset=utf-8")
json.NewEncoder(w).Encode(res)
}
func restPostOverride(m *model.Model, w http.ResponseWriter, r *http.Request) {
var qs = r.URL.Query()
var repo = qs.Get("repo")
go m.Override(repo)
}
func restGetNeed(m *model.Model, w http.ResponseWriter, r *http.Request) {
var qs = r.URL.Query()
var repo = qs.Get("repo")
files := m.NeedFilesRepo(repo)
w.Header().Set("Content-Type", "application/json; charset=utf-8")
json.NewEncoder(w).Encode(files)
}
func restGetConnections(m *model.Model, w http.ResponseWriter, r *http.Request) {
var res = m.ConnectionStats()
w.Header().Set("Content-Type", "application/json; charset=utf-8")
json.NewEncoder(w).Encode(res)
}
func restGetNodeStats(m *model.Model, w http.ResponseWriter, r *http.Request) {
var res = m.NodeStatistics()
w.Header().Set("Content-Type", "application/json; charset=utf-8")
json.NewEncoder(w).Encode(res)
}
func restGetConfig(w http.ResponseWriter, r *http.Request) {
encCfg := cfg
if encCfg.GUI.Password != "" {
encCfg.GUI.Password = unchangedPassword
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
json.NewEncoder(w).Encode(encCfg)
}
func restPostConfig(m *model.Model, w http.ResponseWriter, r *http.Request) {
var newCfg config.Configuration
err := json.NewDecoder(r.Body).Decode(&newCfg)
if err != nil {
l.Warnln("decoding posted config:", err)
http.Error(w, err.Error(), 500)
return
} else {
if newCfg.GUI.Password == "" {
// Leave it empty
} else if newCfg.GUI.Password == unchangedPassword {
newCfg.GUI.Password = cfg.GUI.Password
} else {
hash, err := bcrypt.GenerateFromPassword([]byte(newCfg.GUI.Password), 0)
if err != nil {
l.Warnln("bcrypting password:", err)
http.Error(w, err.Error(), 500)
return
} else {
newCfg.GUI.Password = string(hash)
}
}
// Figure out if any changes require a restart
if len(cfg.Repositories) != len(newCfg.Repositories) {
configInSync = false
} else {
om := cfg.RepoMap()
nm := newCfg.RepoMap()
for id := range om {
if !reflect.DeepEqual(om[id], nm[id]) {
configInSync = false
break
}
}
}
if len(cfg.Nodes) != len(newCfg.Nodes) {
configInSync = false
} else {
om := cfg.NodeMap()
nm := newCfg.NodeMap()
for k := range om {
if _, ok := nm[k]; !ok {
// A node was removed and another added
configInSync = false
break
}
}
}
if newCfg.Options.URAccepted > cfg.Options.URAccepted {
// UR was enabled
newCfg.Options.URAccepted = usageReportVersion
err := sendUsageReport(m)
if err != nil {
l.Infoln("Usage report:", err)
}
go usageReportingLoop(m)
} else if newCfg.Options.URAccepted < cfg.Options.URAccepted {
// UR was disabled
newCfg.Options.URAccepted = -1
stopUsageReporting()
}
if !reflect.DeepEqual(cfg.Options, newCfg.Options) || !reflect.DeepEqual(cfg.GUI, newCfg.GUI) {
configInSync = false
}
// Activate and save
cfg = newCfg
saveConfig()
}
}
func restGetConfigInSync(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
json.NewEncoder(w).Encode(map[string]bool{"configInSync": configInSync})
}
func restPostRestart(w http.ResponseWriter, r *http.Request) {
flushResponse(`{"ok": "restarting"}`, w)
go restart()
}
func restPostReset(w http.ResponseWriter, r *http.Request) {
flushResponse(`{"ok": "resetting repos"}`, w)
resetRepositories()
go restart()
}
func restPostShutdown(w http.ResponseWriter, r *http.Request) {
flushResponse(`{"ok": "shutting down"}`, w)
go shutdown()
}
func flushResponse(s string, w http.ResponseWriter) {
w.Write([]byte(s + "\n"))
f := w.(http.Flusher)
f.Flush()
}
var cpuUsagePercent [10]float64 // The last ten seconds
var cpuUsageLock sync.RWMutex
func restGetSystem(w http.ResponseWriter, r *http.Request) {
var m runtime.MemStats
runtime.ReadMemStats(&m)
res := make(map[string]interface{})
res["myID"] = myID.String()
res["goroutines"] = runtime.NumGoroutine()
res["alloc"] = m.Alloc
res["sys"] = m.Sys - m.HeapReleased
res["tilde"] = expandTilde("~")
if cfg.Options.GlobalAnnEnabled && discoverer != nil {
res["extAnnounceOK"] = discoverer.ExtAnnounceOK()
}
cpuUsageLock.RLock()
var cpusum float64
for _, p := range cpuUsagePercent {
cpusum += p
}
cpuUsageLock.RUnlock()
res["cpuPercent"] = cpusum / 10
w.Header().Set("Content-Type", "application/json; charset=utf-8")
json.NewEncoder(w).Encode(res)
}
func restGetErrors(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
guiErrorsMut.Lock()
json.NewEncoder(w).Encode(guiErrors)
guiErrorsMut.Unlock()
}
func restPostError(w http.ResponseWriter, r *http.Request) {
bs, _ := ioutil.ReadAll(r.Body)
r.Body.Close()
showGuiError(0, string(bs))
}
func restClearErrors(w http.ResponseWriter, r *http.Request) {
guiErrorsMut.Lock()
guiErrors = []guiError{}
guiErrorsMut.Unlock()
}
func showGuiError(l logger.LogLevel, err string) {
guiErrorsMut.Lock()
guiErrors = append(guiErrors, guiError{time.Now(), err})
if len(guiErrors) > 5 {
guiErrors = guiErrors[len(guiErrors)-5:]
}
guiErrorsMut.Unlock()
}
func restPostDiscoveryHint(w http.ResponseWriter, r *http.Request) {
var qs = r.URL.Query()
var node = qs.Get("node")
var addr = qs.Get("addr")
if len(node) != 0 && len(addr) != 0 && discoverer != nil {
discoverer.Hint(node, []string{addr})
}
}
func restGetDiscovery(w http.ResponseWriter, r *http.Request) {
json.NewEncoder(w).Encode(discoverer.All())
}
func restGetReport(m *model.Model, w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
json.NewEncoder(w).Encode(reportData(m))
}
func restGetEvents(w http.ResponseWriter, r *http.Request) {
qs := r.URL.Query()
sinceStr := qs.Get("since")
limitStr := qs.Get("limit")
since, _ := strconv.Atoi(sinceStr)
limit, _ := strconv.Atoi(limitStr)
w.Header().Set("Content-Type", "application/json; charset=utf-8")
// Flush before blocking, to indicate that we've received the request
// and that it should not be retried.
f := w.(http.Flusher)
f.Flush()
evs := eventSub.Since(since, nil)
if 0 < limit && limit < len(evs) {
evs = evs[len(evs)-limit:]
}
json.NewEncoder(w).Encode(evs)
}
func restGetUpgrade(w http.ResponseWriter, r *http.Request) {
rel, err := upgrade.LatestRelease(strings.Contains(Version, "-beta"))
if err != nil {
http.Error(w, err.Error(), 500)
return
}
res := make(map[string]interface{})
res["running"] = Version
res["latest"] = rel.Tag
res["newer"] = upgrade.CompareVersions(rel.Tag, Version) == 1
w.Header().Set("Content-Type", "application/json; charset=utf-8")
json.NewEncoder(w).Encode(res)
}
func restGetNodeID(w http.ResponseWriter, r *http.Request) {
qs := r.URL.Query()
idStr := qs.Get("id")
id, err := protocol.NodeIDFromString(idStr)
w.Header().Set("Content-Type", "application/json; charset=utf-8")
if err == nil {
json.NewEncoder(w).Encode(map[string]string{
"id": id.String(),
})
} else {
json.NewEncoder(w).Encode(map[string]string{
"error": err.Error(),
})
}
}
func restGetLang(w http.ResponseWriter, r *http.Request) {
lang := r.Header.Get("Accept-Language")
var langs []string
for _, l := range strings.Split(lang, ",") {
parts := strings.SplitN(l, ";", 2)
langs = append(langs, strings.ToLower(strings.TrimSpace(parts[0])))
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
json.NewEncoder(w).Encode(langs)
}
func restPostUpgrade(w http.ResponseWriter, r *http.Request) {
rel, err := upgrade.LatestRelease(strings.Contains(Version, "-beta"))
if err != nil {
l.Warnln("getting latest release:", err)
http.Error(w, err.Error(), 500)
return
}
if upgrade.CompareVersions(rel.Tag, Version) == 1 {
err = upgrade.UpgradeTo(rel, GoArchExtra)
if err != nil {
l.Warnln("upgrading:", err)
http.Error(w, err.Error(), 500)
return
}
restPostRestart(w, r)
}
}
func restPostScan(m *model.Model, w http.ResponseWriter, r *http.Request) {
qs := r.URL.Query()
repo := qs.Get("repo")
sub := qs.Get("sub")
err := m.ScanRepoSub(repo, sub)
if err != nil {
http.Error(w, err.Error(), 500)
}
}
func getQR(w http.ResponseWriter, r *http.Request) {
var qs = r.URL.Query()
var text = qs.Get("text")
code, err := qr.Encode(text, qr.M)
if err != nil {
http.Error(w, "Invalid", 500)
return
}
w.Header().Set("Content-Type", "image/png")
w.Write(code.PNG())
}
func restGetPeerCompletion(m *model.Model, w http.ResponseWriter, r *http.Request) {
tot := map[string]float64{}
count := map[string]float64{}
for _, repo := range cfg.Repositories {
for _, node := range repo.NodeIDs() {
nodeStr := node.String()
if m.ConnectedTo(node) {
tot[nodeStr] += m.Completion(node, repo.ID)
} else {
tot[nodeStr] = 0
}
count[nodeStr]++
}
}
comp := map[string]int{}
for node := range tot {
comp[node] = int(tot[node] / count[node])
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
json.NewEncoder(w).Encode(comp)
}
func basicAuthMiddleware(username string, passhash string, next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if validAPIKey(r.Header.Get("X-API-Key")) {
next.ServeHTTP(w, r)
return
}
error := func() {
time.Sleep(time.Duration(rand.Intn(100)+100) * time.Millisecond)
w.Header().Set("WWW-Authenticate", "Basic realm=\"Authorization Required\"")
http.Error(w, "Not Authorized", http.StatusUnauthorized)
}
hdr := r.Header.Get("Authorization")
if !strings.HasPrefix(hdr, "Basic ") {
error()
return
}
hdr = hdr[6:]
bs, err := base64.StdEncoding.DecodeString(hdr)
if err != nil {
error()
return
}
fields := bytes.SplitN(bs, []byte(":"), 2)
if len(fields) != 2 {
error()
return
}
if string(fields[0]) != username {
error()
return
}
if err := bcrypt.CompareHashAndPassword([]byte(passhash), fields[1]); err != nil {
error()
return
}
next.ServeHTTP(w, r)
})
}
func validAPIKey(k string) bool {
return len(apiKey) > 0 && k == apiKey
}
func embeddedStatic(assetDir string) http.Handler {
assets := auto.Assets()
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
file := r.URL.Path
if file[0] == '/' {
file = file[1:]
}
if len(file) == 0 {
file = "index.html"
}
if assetDir != "" {
p := filepath.Join(assetDir, filepath.FromSlash(file))
_, err := os.Stat(p)
if err == nil {
http.ServeFile(w, r, p)
return
}
}
bs, ok := assets[file]
if !ok {
http.NotFound(w, r)
return
}
mtype := mimeTypeForFile(file)
if len(mtype) != 0 {
w.Header().Set("Content-Type", mtype)
}
w.Header().Set("Content-Length", fmt.Sprintf("%d", len(bs)))
w.Header().Set("Last-Modified", modt)
w.Write(bs)
})
}
func mimeTypeForFile(file string) string {
// We use a built in table of the common types since the system
// TypeByExtension might be unreliable. But if we don't know, we delegate
// to the system.
ext := filepath.Ext(file)
switch ext {
case ".htm", ".html":
return "text/html"
case ".css":
return "text/css"
case ".js":
return "application/javascript"
case ".json":
return "application/json"
case ".png":
return "image/png"
case ".ttf":
return "application/x-font-ttf"
case ".woff":
return "application/x-font-woff"
default:
return mime.TypeByExtension(ext)
}
}