ntfy/server/server.go
2022-10-08 17:58:05 -04:00

1476 lines
48 KiB
Go

package server
import (
"bytes"
"context"
"crypto/sha256"
"embed"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"net"
"net/http"
"net/netip"
"net/url"
"os"
"path"
"path/filepath"
"regexp"
"sort"
"strconv"
"strings"
"sync"
"time"
"unicode/utf8"
"heckel.io/ntfy/log"
"github.com/emersion/go-smtp"
"github.com/gorilla/websocket"
"golang.org/x/sync/errgroup"
"heckel.io/ntfy/auth"
"heckel.io/ntfy/util"
)
// Server is the main server, providing the UI and API for ntfy
type Server struct {
config *Config
httpServer *http.Server
httpsServer *http.Server
unixListener net.Listener
smtpServer *smtp.Server
smtpServerBackend *smtpBackend
smtpSender mailer
topics map[string]*topic
visitors map[netip.Addr]*visitor
firebaseClient *firebaseClient
messages int64
auth auth.Auther
messageCache *messageCache
fileCache *fileCache
closeChan chan bool
mu sync.Mutex
}
// handleFunc extends the normal http.HandlerFunc to be able to easily return errors
type handleFunc func(http.ResponseWriter, *http.Request, *visitor) error
var (
// If changed, don't forget to update Android App and auth_sqlite.go
topicRegex = regexp.MustCompile(`^[-_A-Za-z0-9]{1,64}$`) // No /!
topicPathRegex = regexp.MustCompile(`^/[-_A-Za-z0-9]{1,64}$`) // Regex must match JS & Android app!
externalTopicPathRegex = regexp.MustCompile(`^/[^/]+\.[^/]+/[-_A-Za-z0-9]{1,64}$`) // Extended topic path, for web-app, e.g. /example.com/mytopic
jsonPathRegex = regexp.MustCompile(`^/[-_A-Za-z0-9]{1,64}(,[-_A-Za-z0-9]{1,64})*/json$`)
ssePathRegex = regexp.MustCompile(`^/[-_A-Za-z0-9]{1,64}(,[-_A-Za-z0-9]{1,64})*/sse$`)
rawPathRegex = regexp.MustCompile(`^/[-_A-Za-z0-9]{1,64}(,[-_A-Za-z0-9]{1,64})*/raw$`)
wsPathRegex = regexp.MustCompile(`^/[-_A-Za-z0-9]{1,64}(,[-_A-Za-z0-9]{1,64})*/ws$`)
authPathRegex = regexp.MustCompile(`^/[-_A-Za-z0-9]{1,64}(,[-_A-Za-z0-9]{1,64})*/auth$`)
publishPathRegex = regexp.MustCompile(`^/[-_A-Za-z0-9]{1,64}/(publish|send|trigger)$`)
webConfigPath = "/config.js"
userStatsPath = "/user/stats"
matrixPushPath = "/_matrix/push/v1/notify"
staticRegex = regexp.MustCompile(`^/static/.+`)
docsRegex = regexp.MustCompile(`^/docs(|/.*)$`)
fileRegex = regexp.MustCompile(`^/file/([-_A-Za-z0-9]{1,64})(?:\.[A-Za-z0-9]{1,16})?$`)
disallowedTopics = []string{"docs", "static", "file", "app", "settings"} // If updated, also update in Android app
urlRegex = regexp.MustCompile(`^https?://`)
//go:embed site
webFs embed.FS
webFsCached = &util.CachingEmbedFS{ModTime: time.Now(), FS: webFs}
webSiteDir = "/site"
webHomeIndex = "/home.html" // Landing page, only if "web-root: home"
webAppIndex = "/app.html" // React app
//go:embed docs
docsStaticFs embed.FS
docsStaticCached = &util.CachingEmbedFS{ModTime: time.Now(), FS: docsStaticFs}
)
const (
firebaseControlTopic = "~control" // See Android if changed
firebasePollTopic = "~poll" // See iOS if changed
emptyMessageBody = "triggered" // Used if message body is empty
newMessageBody = "New message" // Used in poll requests as generic message
defaultAttachmentMessage = "You received a file: %s" // Used if message body is empty, and there is an attachment
encodingBase64 = "base64"
)
// WebSocket constants
const (
wsWriteWait = 2 * time.Second
wsBufferSize = 1024
wsReadLimit = 64 // We only ever receive PINGs
wsPongWait = 15 * time.Second
)
// New instantiates a new Server. It creates the cache and adds a Firebase
// subscriber (if configured).
func New(conf *Config) (*Server, error) {
var mailer mailer
if conf.SMTPSenderAddr != "" {
mailer = &smtpSender{config: conf}
}
messageCache, err := createMessageCache(conf)
if err != nil {
return nil, err
}
topics, err := messageCache.Topics()
if err != nil {
return nil, err
}
var fileCache *fileCache
if conf.AttachmentCacheDir != "" {
fileCache, err = newFileCache(conf.AttachmentCacheDir, conf.AttachmentTotalSizeLimit, conf.AttachmentFileSizeLimit)
if err != nil {
return nil, err
}
}
var auther auth.Auther
if conf.AuthFile != "" {
auther, err = auth.NewSQLiteAuth(conf.AuthFile, conf.AuthDefaultRead, conf.AuthDefaultWrite)
if err != nil {
return nil, err
}
}
var firebaseClient *firebaseClient
if conf.FirebaseKeyFile != "" {
sender, err := newFirebaseSender(conf.FirebaseKeyFile)
if err != nil {
return nil, err
}
firebaseClient = newFirebaseClient(sender, auther)
}
return &Server{
config: conf,
messageCache: messageCache,
fileCache: fileCache,
firebaseClient: firebaseClient,
smtpSender: mailer,
topics: topics,
auth: auther,
visitors: make(map[netip.Addr]*visitor),
}, nil
}
func createMessageCache(conf *Config) (*messageCache, error) {
if conf.CacheDuration == 0 {
return newNopCache()
} else if conf.CacheFile != "" {
return newSqliteCache(conf.CacheFile, conf.CacheStartupQueries, false)
}
return newMemCache()
}
// Run executes the main server. It listens on HTTP (+ HTTPS, if configured), and starts
// a manager go routine to print stats and prune messages.
func (s *Server) Run() error {
var listenStr string
if s.config.ListenHTTP != "" {
listenStr += fmt.Sprintf(" %s[http]", s.config.ListenHTTP)
}
if s.config.ListenHTTPS != "" {
listenStr += fmt.Sprintf(" %s[https]", s.config.ListenHTTPS)
}
if s.config.ListenUnix != "" {
listenStr += fmt.Sprintf(" %s[unix]", s.config.ListenUnix)
}
if s.config.SMTPServerListen != "" {
listenStr += fmt.Sprintf(" %s[smtp]", s.config.SMTPServerListen)
}
log.Info("Listening on%s, ntfy %s, log level is %s", listenStr, s.config.Version, log.CurrentLevel().String())
mux := http.NewServeMux()
mux.HandleFunc("/", s.handle)
errChan := make(chan error)
s.mu.Lock()
s.closeChan = make(chan bool)
if s.config.ListenHTTP != "" {
s.httpServer = &http.Server{Addr: s.config.ListenHTTP, Handler: mux}
go func() {
errChan <- s.httpServer.ListenAndServe()
}()
}
if s.config.ListenHTTPS != "" {
s.httpsServer = &http.Server{Addr: s.config.ListenHTTPS, Handler: mux}
go func() {
errChan <- s.httpsServer.ListenAndServeTLS(s.config.CertFile, s.config.KeyFile)
}()
}
if s.config.ListenUnix != "" {
go func() {
var err error
s.mu.Lock()
os.Remove(s.config.ListenUnix)
s.unixListener, err = net.Listen("unix", s.config.ListenUnix)
if err != nil {
s.mu.Unlock()
errChan <- err
return
}
defer s.unixListener.Close()
if s.config.ListenUnixMode > 0 {
if err := os.Chmod(s.config.ListenUnix, s.config.ListenUnixMode); err != nil {
s.mu.Unlock()
errChan <- err
return
}
}
s.mu.Unlock()
httpServer := &http.Server{Handler: mux}
errChan <- httpServer.Serve(s.unixListener)
}()
}
if s.config.SMTPServerListen != "" {
go func() {
errChan <- s.runSMTPServer()
}()
}
s.mu.Unlock()
go s.runManager()
go s.runDelayedSender()
go s.runFirebaseKeepaliver()
return <-errChan
}
// Stop stops HTTP (+HTTPS) server and all managers
func (s *Server) Stop() {
s.mu.Lock()
defer s.mu.Unlock()
if s.httpServer != nil {
s.httpServer.Close()
}
if s.httpsServer != nil {
s.httpsServer.Close()
}
if s.unixListener != nil {
s.unixListener.Close()
}
if s.smtpServer != nil {
s.smtpServer.Close()
}
close(s.closeChan)
}
func (s *Server) handle(w http.ResponseWriter, r *http.Request) {
v := s.visitor(r)
log.Debug("%s Dispatching request", logHTTPPrefix(v, r))
if log.IsTrace() {
log.Trace("%s Entire request (headers and body):\n%s", logHTTPPrefix(v, r), renderHTTPRequest(r))
}
if err := s.handleInternal(w, r, v); err != nil {
if websocket.IsWebSocketUpgrade(r) {
isNormalError := strings.Contains(err.Error(), "i/o timeout")
if isNormalError {
log.Debug("%s WebSocket error (this error is okay, it happens a lot): %s", logHTTPPrefix(v, r), err.Error())
} else {
log.Info("%s WebSocket error: %s", logHTTPPrefix(v, r), err.Error())
}
return // Do not attempt to write to upgraded connection
}
if matrixErr, ok := err.(*errMatrix); ok {
writeMatrixError(w, r, v, matrixErr)
return
}
httpErr, ok := err.(*errHTTP)
if !ok {
httpErr = errHTTPInternalError
}
isNormalError := httpErr.HTTPCode == http.StatusNotFound || httpErr.HTTPCode == http.StatusBadRequest
if isNormalError {
log.Debug("%s Connection closed with HTTP %d (ntfy error %d): %s", logHTTPPrefix(v, r), httpErr.HTTPCode, httpErr.Code, err.Error())
} else {
log.Info("%s Connection closed with HTTP %d (ntfy error %d): %s", logHTTPPrefix(v, r), httpErr.HTTPCode, httpErr.Code, err.Error())
}
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*") // CORS, allow cross-origin requests
w.WriteHeader(httpErr.HTTPCode)
io.WriteString(w, httpErr.JSON()+"\n")
}
}
func (s *Server) handleInternal(w http.ResponseWriter, r *http.Request, v *visitor) error {
if r.Method == http.MethodGet && r.URL.Path == "/" {
return s.ensureWebEnabled(s.handleHome)(w, r, v)
} else if r.Method == http.MethodHead && r.URL.Path == "/" {
return s.ensureWebEnabled(s.handleEmpty)(w, r, v)
} else if r.Method == http.MethodGet && r.URL.Path == webConfigPath {
return s.ensureWebEnabled(s.handleWebConfig)(w, r, v)
} else if r.Method == http.MethodGet && r.URL.Path == userStatsPath {
return s.handleUserStats(w, r, v)
} else if r.Method == http.MethodGet && r.URL.Path == matrixPushPath {
return s.handleMatrixDiscovery(w)
} else if r.Method == http.MethodGet && staticRegex.MatchString(r.URL.Path) {
return s.ensureWebEnabled(s.handleStatic)(w, r, v)
} else if r.Method == http.MethodGet && docsRegex.MatchString(r.URL.Path) {
return s.ensureWebEnabled(s.handleDocs)(w, r, v)
} else if (r.Method == http.MethodGet || r.Method == http.MethodHead) && fileRegex.MatchString(r.URL.Path) && s.config.AttachmentCacheDir != "" {
return s.limitRequests(s.handleFile)(w, r, v)
} else if r.Method == http.MethodOptions {
return s.ensureWebEnabled(s.handleOptions)(w, r, v)
} else if (r.Method == http.MethodPut || r.Method == http.MethodPost) && r.URL.Path == "/" {
return s.limitRequests(s.transformBodyJSON(s.authWrite(s.handlePublish)))(w, r, v)
} else if r.Method == http.MethodPost && r.URL.Path == matrixPushPath {
return s.limitRequests(s.transformMatrixJSON(s.authWrite(s.handlePublishMatrix)))(w, r, v)
} else if (r.Method == http.MethodPut || r.Method == http.MethodPost) && topicPathRegex.MatchString(r.URL.Path) {
return s.limitRequests(s.authWrite(s.handlePublish))(w, r, v)
} else if r.Method == http.MethodGet && publishPathRegex.MatchString(r.URL.Path) {
return s.limitRequests(s.authWrite(s.handlePublish))(w, r, v)
} else if r.Method == http.MethodGet && jsonPathRegex.MatchString(r.URL.Path) {
return s.limitRequests(s.authRead(s.handleSubscribeJSON))(w, r, v)
} else if r.Method == http.MethodGet && ssePathRegex.MatchString(r.URL.Path) {
return s.limitRequests(s.authRead(s.handleSubscribeSSE))(w, r, v)
} else if r.Method == http.MethodGet && rawPathRegex.MatchString(r.URL.Path) {
return s.limitRequests(s.authRead(s.handleSubscribeRaw))(w, r, v)
} else if r.Method == http.MethodGet && wsPathRegex.MatchString(r.URL.Path) {
return s.limitRequests(s.authRead(s.handleSubscribeWS))(w, r, v)
} else if r.Method == http.MethodGet && authPathRegex.MatchString(r.URL.Path) {
return s.limitRequests(s.authRead(s.handleTopicAuth))(w, r, v)
} else if r.Method == http.MethodGet && (topicPathRegex.MatchString(r.URL.Path) || externalTopicPathRegex.MatchString(r.URL.Path)) {
return s.ensureWebEnabled(s.handleTopic)(w, r, v)
}
return errHTTPNotFound
}
func (s *Server) handleHome(w http.ResponseWriter, r *http.Request, v *visitor) error {
if s.config.WebRootIsApp {
r.URL.Path = webAppIndex
} else {
r.URL.Path = webHomeIndex
}
return s.handleStatic(w, r, v)
}
func (s *Server) handleTopic(w http.ResponseWriter, r *http.Request, v *visitor) error {
unifiedpush := readBoolParam(r, false, "x-unifiedpush", "unifiedpush", "up") // see PUT/POST too!
if unifiedpush {
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*") // CORS, allow cross-origin requests
_, err := io.WriteString(w, `{"unifiedpush":{"version":1}}`+"\n")
return err
}
r.URL.Path = webAppIndex
return s.handleStatic(w, r, v)
}
func (s *Server) handleEmpty(_ http.ResponseWriter, _ *http.Request, _ *visitor) error {
return nil
}
func (s *Server) handleTopicAuth(w http.ResponseWriter, _ *http.Request, _ *visitor) error {
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*") // CORS, allow cross-origin requests
_, err := io.WriteString(w, `{"success":true}`+"\n")
return err
}
func (s *Server) handleWebConfig(w http.ResponseWriter, _ *http.Request, _ *visitor) error {
appRoot := "/"
if !s.config.WebRootIsApp {
appRoot = "/app"
}
disallowedTopicsStr := `"` + strings.Join(disallowedTopics, `", "`) + `"`
w.Header().Set("Content-Type", "text/javascript")
_, err := io.WriteString(w, fmt.Sprintf(`// Generated server configuration
var config = {
appRoot: "%s",
disallowedTopics: [%s]
};`, appRoot, disallowedTopicsStr))
return err
}
func (s *Server) handleUserStats(w http.ResponseWriter, r *http.Request, v *visitor) error {
stats, err := v.Stats()
if err != nil {
return err
}
w.Header().Set("Content-Type", "text/json")
w.Header().Set("Access-Control-Allow-Origin", "*") // CORS, allow cross-origin requests
if err := json.NewEncoder(w).Encode(stats); err != nil {
return err
}
return nil
}
func (s *Server) handleStatic(w http.ResponseWriter, r *http.Request, _ *visitor) error {
r.URL.Path = webSiteDir + r.URL.Path
util.Gzip(http.FileServer(http.FS(webFsCached))).ServeHTTP(w, r)
return nil
}
func (s *Server) handleDocs(w http.ResponseWriter, r *http.Request, _ *visitor) error {
util.Gzip(http.FileServer(http.FS(docsStaticCached))).ServeHTTP(w, r)
return nil
}
func (s *Server) handleFile(w http.ResponseWriter, r *http.Request, v *visitor) error {
if s.config.AttachmentCacheDir == "" {
return errHTTPInternalError
}
matches := fileRegex.FindStringSubmatch(r.URL.Path)
if len(matches) != 2 {
return errHTTPInternalErrorInvalidFilePath
}
messageID := matches[1]
file := filepath.Join(s.config.AttachmentCacheDir, messageID)
stat, err := os.Stat(file)
if err != nil {
return errHTTPNotFound
}
if r.Method == http.MethodGet {
if err := v.BandwidthLimiter().Allow(stat.Size()); err != nil {
return errHTTPTooManyRequestsAttachmentBandwidthLimit
}
}
w.Header().Set("Content-Length", fmt.Sprintf("%d", stat.Size()))
w.Header().Set("Access-Control-Allow-Origin", "*") // CORS, allow cross-origin requests
if r.Method == http.MethodGet {
f, err := os.Open(file)
if err != nil {
return err
}
defer f.Close()
_, err = io.Copy(util.NewContentTypeWriter(w, r.URL.Path), f)
return err
}
return nil
}
func (s *Server) handleMatrixDiscovery(w http.ResponseWriter) error {
if s.config.BaseURL == "" {
return errHTTPInternalErrorMissingBaseURL
}
return writeMatrixDiscoveryResponse(w)
}
func (s *Server) handlePublishWithoutResponse(r *http.Request, v *visitor) (*message, error) {
t, err := s.topicFromPath(r.URL.Path)
if err != nil {
return nil, err
}
body, err := util.Peek(r.Body, s.config.MessageLimit)
if err != nil {
return nil, err
}
m := newDefaultMessage(t.ID, "")
cache, firebase, email, unifiedpush, err := s.parsePublishParams(r, v, m)
if err != nil {
return nil, err
}
if m.PollID != "" {
m = newPollRequestMessage(t.ID, m.PollID)
}
if err := s.handlePublishBody(r, v, m, body, unifiedpush); err != nil {
return nil, err
}
if m.Message == "" {
m.Message = emptyMessageBody
}
delayed := m.Time > time.Now().Unix()
log.Debug("%s Received message: event=%s, body=%d byte(s), delayed=%t, firebase=%t, cache=%t, up=%t, email=%s",
logMessagePrefix(v, m), m.Event, len(m.Message), delayed, firebase, cache, unifiedpush, email)
if log.IsTrace() {
log.Trace("%s Message body: %s", logMessagePrefix(v, m), util.MaybeMarshalJSON(m))
}
if !delayed {
if err := t.Publish(v, m); err != nil {
return nil, err
}
if s.firebaseClient != nil && firebase {
go s.sendToFirebase(v, m)
}
if s.smtpSender != nil && email != "" {
go s.sendEmail(v, m, email)
}
if s.config.UpstreamBaseURL != "" {
go s.forwardPollRequest(v, m)
}
} else {
log.Debug("%s Message delayed, will process later", logMessagePrefix(v, m))
}
if cache {
if err := s.messageCache.AddMessage(m); err != nil {
return nil, err
}
}
s.mu.Lock()
s.messages++
s.mu.Unlock()
return m, nil
}
func (s *Server) handlePublish(w http.ResponseWriter, r *http.Request, v *visitor) error {
m, err := s.handlePublishWithoutResponse(r, v)
if err != nil {
return err
}
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*") // CORS, allow cross-origin requests
if err := json.NewEncoder(w).Encode(m); err != nil {
return err
}
return nil
}
func (s *Server) handlePublishMatrix(w http.ResponseWriter, r *http.Request, v *visitor) error {
_, err := s.handlePublishWithoutResponse(r, v)
if err != nil {
return &errMatrix{pushKey: r.Header.Get(matrixPushKeyHeader), err: err}
}
return writeMatrixSuccess(w)
}
func (s *Server) sendToFirebase(v *visitor, m *message) {
log.Debug("%s Publishing to Firebase", logMessagePrefix(v, m))
if err := s.firebaseClient.Send(v, m); err != nil {
if err == errFirebaseTemporarilyBanned {
log.Debug("%s Unable to publish to Firebase: %v", logMessagePrefix(v, m), err.Error())
} else {
log.Warn("%s Unable to publish to Firebase: %v", logMessagePrefix(v, m), err.Error())
}
}
}
func (s *Server) sendEmail(v *visitor, m *message, email string) {
log.Debug("%s Sending email to %s", logMessagePrefix(v, m), email)
if err := s.smtpSender.Send(v, m, email); err != nil {
log.Warn("%s Unable to send email to %s: %v", logMessagePrefix(v, m), email, err.Error())
}
}
func (s *Server) forwardPollRequest(v *visitor, m *message) {
topicURL := fmt.Sprintf("%s/%s", s.config.BaseURL, m.Topic)
topicHash := fmt.Sprintf("%x", sha256.Sum256([]byte(topicURL)))
forwardURL := fmt.Sprintf("%s/%s", s.config.UpstreamBaseURL, topicHash)
log.Debug("%s Publishing poll request to %s", logMessagePrefix(v, m), forwardURL)
req, err := http.NewRequest("POST", forwardURL, strings.NewReader(""))
if err != nil {
log.Warn("%s Unable to publish poll request: %v", logMessagePrefix(v, m), err.Error())
return
}
req.Header.Set("X-Poll-ID", m.ID)
var httpClient = &http.Client{
Timeout: time.Second * 10,
}
response, err := httpClient.Do(req)
if err != nil {
log.Warn("%s Unable to publish poll request: %v", logMessagePrefix(v, m), err.Error())
return
} else if response.StatusCode != http.StatusOK {
log.Warn("%s Unable to publish poll request, unexpected HTTP status: %d", logMessagePrefix(v, m), response.StatusCode)
return
}
}
func (s *Server) parsePublishParams(r *http.Request, v *visitor, m *message) (cache bool, firebase bool, email string, unifiedpush bool, err error) {
cache = readBoolParam(r, true, "x-cache", "cache")
firebase = readBoolParam(r, true, "x-firebase", "firebase")
m.Title = readParam(r, "x-title", "title", "t")
m.Click = readParam(r, "x-click", "click")
icon := readParam(r, "x-icon", "icon")
filename := readParam(r, "x-filename", "filename", "file", "f")
attach := readParam(r, "x-attach", "attach", "a")
if attach != "" || filename != "" {
m.Attachment = &attachment{}
}
if filename != "" {
m.Attachment.Name = filename
}
if attach != "" {
if !urlRegex.MatchString(attach) {
return false, false, "", false, errHTTPBadRequestAttachmentURLInvalid
}
m.Attachment.URL = attach
if m.Attachment.Name == "" {
u, err := url.Parse(m.Attachment.URL)
if err == nil {
m.Attachment.Name = path.Base(u.Path)
if m.Attachment.Name == "." || m.Attachment.Name == "/" {
m.Attachment.Name = ""
}
}
}
if m.Attachment.Name == "" {
m.Attachment.Name = "attachment"
}
}
if icon != "" {
if !urlRegex.MatchString(icon) {
return false, false, "", false, errHTTPBadRequestIconURLInvalid
}
m.Icon = icon
}
email = readParam(r, "x-email", "x-e-mail", "email", "e-mail", "mail", "e")
if email != "" {
if err := v.EmailAllowed(); err != nil {
return false, false, "", false, errHTTPTooManyRequestsLimitEmails
}
}
if s.smtpSender == nil && email != "" {
return false, false, "", false, errHTTPBadRequestEmailDisabled
}
messageStr := strings.ReplaceAll(readParam(r, "x-message", "message", "m"), "\\n", "\n")
if messageStr != "" {
m.Message = messageStr
}
m.Priority, err = util.ParsePriority(readParam(r, "x-priority", "priority", "prio", "p"))
if err != nil {
return false, false, "", false, errHTTPBadRequestPriorityInvalid
}
tagsStr := readParam(r, "x-tags", "tags", "tag", "ta")
if tagsStr != "" {
m.Tags = make([]string, 0)
for _, s := range util.SplitNoEmpty(tagsStr, ",") {
m.Tags = append(m.Tags, strings.TrimSpace(s))
}
}
delayStr := readParam(r, "x-delay", "delay", "x-at", "at", "x-in", "in")
if delayStr != "" {
if !cache {
return false, false, "", false, errHTTPBadRequestDelayNoCache
}
if email != "" {
return false, false, "", false, errHTTPBadRequestDelayNoEmail // we cannot store the email address (yet)
}
delay, err := util.ParseFutureTime(delayStr, time.Now())
if err != nil {
return false, false, "", false, errHTTPBadRequestDelayCannotParse
} else if delay.Unix() < time.Now().Add(s.config.MinDelay).Unix() {
return false, false, "", false, errHTTPBadRequestDelayTooSmall
} else if delay.Unix() > time.Now().Add(s.config.MaxDelay).Unix() {
return false, false, "", false, errHTTPBadRequestDelayTooLarge
}
m.Time = delay.Unix()
m.Sender = v.ip // Important for rate limiting
}
actionsStr := readParam(r, "x-actions", "actions", "action")
if actionsStr != "" {
m.Actions, err = parseActions(actionsStr)
if err != nil {
return false, false, "", false, wrapErrHTTP(errHTTPBadRequestActionsInvalid, err.Error())
}
}
unifiedpush = readBoolParam(r, false, "x-unifiedpush", "unifiedpush", "up") // see GET too!
if unifiedpush {
firebase = false
unifiedpush = true
}
m.PollID = readParam(r, "x-poll-id", "poll-id")
if m.PollID != "" {
unifiedpush = false
cache = false
email = ""
}
return cache, firebase, email, unifiedpush, nil
}
// handlePublishBody consumes the PUT/POST body and decides whether the body is an attachment or the message.
//
// 1. curl -X POST -H "Poll: 1234" ntfy.sh/...
// If a message is flagged as poll request, the body does not matter and is discarded
// 2. curl -T somebinarydata.bin "ntfy.sh/mytopic?up=1"
// If body is binary, encode as base64, if not do not encode
// 3. curl -H "Attach: http://example.com/file.jpg" ntfy.sh/mytopic
// Body must be a message, because we attached an external URL
// 4. curl -T short.txt -H "Filename: short.txt" ntfy.sh/mytopic
// Body must be attachment, because we passed a filename
// 5. curl -T file.txt ntfy.sh/mytopic
// If file.txt is <= 4096 (message limit) and valid UTF-8, treat it as a message
// 6. curl -T file.txt ntfy.sh/mytopic
// If file.txt is > message limit, treat it as an attachment
func (s *Server) handlePublishBody(r *http.Request, v *visitor, m *message, body *util.PeekedReadCloser, unifiedpush bool) error {
if m.Event == pollRequestEvent { // Case 1
return s.handleBodyDiscard(body)
} else if unifiedpush {
return s.handleBodyAsMessageAutoDetect(m, body) // Case 2
} else if m.Attachment != nil && m.Attachment.URL != "" {
return s.handleBodyAsTextMessage(m, body) // Case 3
} else if m.Attachment != nil && m.Attachment.Name != "" {
return s.handleBodyAsAttachment(r, v, m, body) // Case 4
} else if !body.LimitReached && utf8.Valid(body.PeekedBytes) {
return s.handleBodyAsTextMessage(m, body) // Case 5
}
return s.handleBodyAsAttachment(r, v, m, body) // Case 6
}
func (s *Server) handleBodyDiscard(body *util.PeekedReadCloser) error {
_, err := io.Copy(io.Discard, body)
_ = body.Close()
return err
}
func (s *Server) handleBodyAsMessageAutoDetect(m *message, body *util.PeekedReadCloser) error {
if utf8.Valid(body.PeekedBytes) {
m.Message = string(body.PeekedBytes) // Do not trim
} else {
m.Message = base64.StdEncoding.EncodeToString(body.PeekedBytes)
m.Encoding = encodingBase64
}
return nil
}
func (s *Server) handleBodyAsTextMessage(m *message, body *util.PeekedReadCloser) error {
if !utf8.Valid(body.PeekedBytes) {
return errHTTPBadRequestMessageNotUTF8
}
if len(body.PeekedBytes) > 0 { // Empty body should not override message (publish via GET!)
m.Message = strings.TrimSpace(string(body.PeekedBytes)) // Truncates the message to the peek limit if required
}
if m.Attachment != nil && m.Attachment.Name != "" && m.Message == "" {
m.Message = fmt.Sprintf(defaultAttachmentMessage, m.Attachment.Name)
}
return nil
}
func (s *Server) handleBodyAsAttachment(r *http.Request, v *visitor, m *message, body *util.PeekedReadCloser) error {
if s.fileCache == nil || s.config.BaseURL == "" || s.config.AttachmentCacheDir == "" {
return errHTTPBadRequestAttachmentsDisallowed
} else if m.Time > time.Now().Add(s.config.AttachmentExpiryDuration).Unix() {
return errHTTPBadRequestAttachmentsExpiryBeforeDelivery
}
visitorStats, err := v.Stats()
if err != nil {
return err
}
contentLengthStr := r.Header.Get("Content-Length")
if contentLengthStr != "" { // Early "do-not-trust" check, hard limit see below
contentLength, err := strconv.ParseInt(contentLengthStr, 10, 64)
if err == nil && (contentLength > visitorStats.VisitorAttachmentBytesRemaining || contentLength > s.config.AttachmentFileSizeLimit) {
return errHTTPEntityTooLargeAttachmentTooLarge
}
}
if m.Attachment == nil {
m.Attachment = &attachment{}
}
var ext string
m.Sender = v.ip // Important for attachment rate limiting
m.Attachment.Expires = time.Now().Add(s.config.AttachmentExpiryDuration).Unix()
m.Attachment.Type, ext = util.DetectContentType(body.PeekedBytes, m.Attachment.Name)
m.Attachment.URL = fmt.Sprintf("%s/file/%s%s", s.config.BaseURL, m.ID, ext)
if m.Attachment.Name == "" {
m.Attachment.Name = fmt.Sprintf("attachment%s", ext)
}
if m.Message == "" {
m.Message = fmt.Sprintf(defaultAttachmentMessage, m.Attachment.Name)
}
m.Attachment.Size, err = s.fileCache.Write(m.ID, body, v.BandwidthLimiter(), util.NewFixedLimiter(visitorStats.VisitorAttachmentBytesRemaining))
if err == util.ErrLimitReached {
return errHTTPEntityTooLargeAttachmentTooLarge
} else if err != nil {
return err
}
return nil
}
func (s *Server) handleSubscribeJSON(w http.ResponseWriter, r *http.Request, v *visitor) error {
encoder := func(msg *message) (string, error) {
var buf bytes.Buffer
if err := json.NewEncoder(&buf).Encode(&msg); err != nil {
return "", err
}
return buf.String(), nil
}
return s.handleSubscribeHTTP(w, r, v, "application/x-ndjson", encoder)
}
func (s *Server) handleSubscribeSSE(w http.ResponseWriter, r *http.Request, v *visitor) error {
encoder := func(msg *message) (string, error) {
var buf bytes.Buffer
if err := json.NewEncoder(&buf).Encode(&msg); err != nil {
return "", err
}
if msg.Event != messageEvent {
return fmt.Sprintf("event: %s\ndata: %s\n", msg.Event, buf.String()), nil // Browser's .onmessage() does not fire on this!
}
return fmt.Sprintf("data: %s\n", buf.String()), nil
}
return s.handleSubscribeHTTP(w, r, v, "text/event-stream", encoder)
}
func (s *Server) handleSubscribeRaw(w http.ResponseWriter, r *http.Request, v *visitor) error {
encoder := func(msg *message) (string, error) {
if msg.Event == messageEvent { // only handle default events
return strings.ReplaceAll(msg.Message, "\n", " ") + "\n", nil
}
return "\n", nil // "keepalive" and "open" events just send an empty line
}
return s.handleSubscribeHTTP(w, r, v, "text/plain", encoder)
}
func (s *Server) handleSubscribeHTTP(w http.ResponseWriter, r *http.Request, v *visitor, contentType string, encoder messageEncoder) error {
log.Debug("%s HTTP stream connection opened", logHTTPPrefix(v, r))
defer log.Debug("%s HTTP stream connection closed", logHTTPPrefix(v, r))
if err := v.SubscriptionAllowed(); err != nil {
return errHTTPTooManyRequestsLimitSubscriptions
}
defer v.RemoveSubscription()
topics, topicsStr, err := s.topicsFromPath(r.URL.Path)
if err != nil {
return err
}
poll, since, scheduled, filters, err := parseSubscribeParams(r)
if err != nil {
return err
}
var wlock sync.Mutex
defer func() {
// Hack: This is the fix for a horrible data race that I have not been able to figure out in quite some time.
// It appears to be happening when the Go HTTP code reads from the socket when closing the request (i.e. AFTER
// this function returns), and causes a data race with the ResponseWriter. Locking wlock here silences the
// data race detector. See https://github.com/binwiederhier/ntfy/issues/338#issuecomment-1163425889.
wlock.TryLock()
}()
sub := func(v *visitor, msg *message) error {
if !filters.Pass(msg) {
return nil
}
m, err := encoder(msg)
if err != nil {
return err
}
wlock.Lock()
defer wlock.Unlock()
if _, err := w.Write([]byte(m)); err != nil {
return err
}
if fl, ok := w.(http.Flusher); ok {
fl.Flush()
}
return nil
}
w.Header().Set("Access-Control-Allow-Origin", "*") // CORS, allow cross-origin requests
w.Header().Set("Content-Type", contentType+"; charset=utf-8") // Android/Volley client needs charset!
if poll {
return s.sendOldMessages(topics, since, scheduled, v, sub)
}
subscriberIDs := make([]int, 0)
for _, t := range topics {
subscriberIDs = append(subscriberIDs, t.Subscribe(sub))
}
defer func() {
for i, subscriberID := range subscriberIDs {
topics[i].Unsubscribe(subscriberID) // Order!
}
}()
if err := sub(v, newOpenMessage(topicsStr)); err != nil { // Send out open message
return err
}
if err := s.sendOldMessages(topics, since, scheduled, v, sub); err != nil {
return err
}
for {
select {
case <-r.Context().Done():
return nil
case <-time.After(s.config.KeepaliveInterval):
log.Trace("%s Sending keepalive message", logHTTPPrefix(v, r))
v.Keepalive()
if err := sub(v, newKeepaliveMessage(topicsStr)); err != nil { // Send keepalive message
return err
}
}
}
}
func (s *Server) handleSubscribeWS(w http.ResponseWriter, r *http.Request, v *visitor) error {
if strings.ToLower(r.Header.Get("Upgrade")) != "websocket" {
return errHTTPBadRequestWebSocketsUpgradeHeaderMissing
}
if err := v.SubscriptionAllowed(); err != nil {
return errHTTPTooManyRequestsLimitSubscriptions
}
defer v.RemoveSubscription()
log.Debug("%s WebSocket connection opened", logHTTPPrefix(v, r))
defer log.Debug("%s WebSocket connection closed", logHTTPPrefix(v, r))
topics, topicsStr, err := s.topicsFromPath(r.URL.Path)
if err != nil {
return err
}
poll, since, scheduled, filters, err := parseSubscribeParams(r)
if err != nil {
return err
}
upgrader := &websocket.Upgrader{
ReadBufferSize: wsBufferSize,
WriteBufferSize: wsBufferSize,
CheckOrigin: func(r *http.Request) bool {
return true // We're open for business!
},
}
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
return err
}
defer conn.Close()
var wlock sync.Mutex
g, ctx := errgroup.WithContext(context.Background())
g.Go(func() error {
pongWait := s.config.KeepaliveInterval + wsPongWait
conn.SetReadLimit(wsReadLimit)
if err := conn.SetReadDeadline(time.Now().Add(pongWait)); err != nil {
return err
}
conn.SetPongHandler(func(appData string) error {
log.Trace("%s Received WebSocket pong", logHTTPPrefix(v, r))
return conn.SetReadDeadline(time.Now().Add(pongWait))
})
for {
_, _, err := conn.NextReader()
if err != nil {
return err
}
}
})
g.Go(func() error {
ping := func() error {
wlock.Lock()
defer wlock.Unlock()
if err := conn.SetWriteDeadline(time.Now().Add(wsWriteWait)); err != nil {
return err
}
log.Trace("%s Sending WebSocket ping", logHTTPPrefix(v, r))
return conn.WriteMessage(websocket.PingMessage, nil)
}
for {
select {
case <-ctx.Done():
return nil
case <-time.After(s.config.KeepaliveInterval):
v.Keepalive()
if err := ping(); err != nil {
return err
}
}
}
})
sub := func(v *visitor, msg *message) error {
if !filters.Pass(msg) {
return nil
}
wlock.Lock()
defer wlock.Unlock()
if err := conn.SetWriteDeadline(time.Now().Add(wsWriteWait)); err != nil {
return err
}
return conn.WriteJSON(msg)
}
w.Header().Set("Access-Control-Allow-Origin", "*") // CORS, allow cross-origin requests
if poll {
return s.sendOldMessages(topics, since, scheduled, v, sub)
}
subscriberIDs := make([]int, 0)
for _, t := range topics {
subscriberIDs = append(subscriberIDs, t.Subscribe(sub))
}
defer func() {
for i, subscriberID := range subscriberIDs {
topics[i].Unsubscribe(subscriberID) // Order!
}
}()
if err := sub(v, newOpenMessage(topicsStr)); err != nil { // Send out open message
return err
}
if err := s.sendOldMessages(topics, since, scheduled, v, sub); err != nil {
return err
}
err = g.Wait()
if err != nil && websocket.IsCloseError(err, websocket.CloseNormalClosure, websocket.CloseGoingAway, websocket.CloseAbnormalClosure) {
log.Trace("%s WebSocket connection closed: %s", logHTTPPrefix(v, r), err.Error())
return nil // Normal closures are not errors; note: "1006 (abnormal closure)" is treated as normal, because people disconnect a lot
}
return err
}
func parseSubscribeParams(r *http.Request) (poll bool, since sinceMarker, scheduled bool, filters *queryFilter, err error) {
poll = readBoolParam(r, false, "x-poll", "poll", "po")
scheduled = readBoolParam(r, false, "x-scheduled", "scheduled", "sched")
since, err = parseSince(r, poll)
if err != nil {
return
}
filters, err = parseQueryFilters(r)
if err != nil {
return
}
return
}
// sendOldMessages selects old messages from the messageCache and calls sub for each of them. It uses since as the
// marker, returning only messages that are newer than the marker.
func (s *Server) sendOldMessages(topics []*topic, since sinceMarker, scheduled bool, v *visitor, sub subscriber) error {
if since.IsNone() {
return nil
}
messages := make([]*message, 0)
for _, t := range topics {
topicMessages, err := s.messageCache.Messages(t.ID, since, scheduled)
if err != nil {
return err
}
messages = append(messages, topicMessages...)
}
sort.Slice(messages, func(i, j int) bool {
return messages[i].Time < messages[j].Time
})
for _, m := range messages {
if err := sub(v, m); err != nil {
return err
}
}
return nil
}
// parseSince returns a timestamp identifying the time span from which cached messages should be received.
//
// Values in the "since=..." parameter can be either a unix timestamp or a duration (e.g. 12h), or
// "all" for all messages.
func parseSince(r *http.Request, poll bool) (sinceMarker, error) {
since := readParam(r, "x-since", "since", "si")
// Easy cases (empty, all, none)
if since == "" {
if poll {
return sinceAllMessages, nil
}
return sinceNoMessages, nil
} else if since == "all" {
return sinceAllMessages, nil
} else if since == "none" {
return sinceNoMessages, nil
}
// ID, timestamp, duration
if validMessageID(since) {
return newSinceID(since), nil
} else if s, err := strconv.ParseInt(since, 10, 64); err == nil {
return newSinceTime(s), nil
} else if d, err := time.ParseDuration(since); err == nil {
return newSinceTime(time.Now().Add(-1 * d).Unix()), nil
}
return sinceNoMessages, errHTTPBadRequestSinceInvalid
}
func (s *Server) handleOptions(w http.ResponseWriter, _ *http.Request, _ *visitor) error {
w.Header().Set("Access-Control-Allow-Methods", "GET, PUT, POST")
w.Header().Set("Access-Control-Allow-Origin", "*") // CORS, allow cross-origin requests
w.Header().Set("Access-Control-Allow-Headers", "*") // CORS, allow auth via JS // FIXME is this terrible?
return nil
}
func (s *Server) topicFromPath(path string) (*topic, error) {
parts := strings.Split(path, "/")
if len(parts) < 2 {
return nil, errHTTPBadRequestTopicInvalid
}
topics, err := s.topicsFromIDs(parts[1])
if err != nil {
return nil, err
}
return topics[0], nil
}
func (s *Server) topicsFromPath(path string) ([]*topic, string, error) {
parts := strings.Split(path, "/")
if len(parts) < 2 {
return nil, "", errHTTPBadRequestTopicInvalid
}
topicIDs := util.SplitNoEmpty(parts[1], ",")
topics, err := s.topicsFromIDs(topicIDs...)
if err != nil {
return nil, "", errHTTPBadRequestTopicInvalid
}
return topics, parts[1], nil
}
func (s *Server) topicsFromIDs(ids ...string) ([]*topic, error) {
s.mu.Lock()
defer s.mu.Unlock()
topics := make([]*topic, 0)
for _, id := range ids {
if util.Contains(disallowedTopics, id) {
return nil, errHTTPBadRequestTopicDisallowed
}
if _, ok := s.topics[id]; !ok {
if len(s.topics) >= s.config.TotalTopicLimit {
return nil, errHTTPTooManyRequestsLimitTotalTopics
}
s.topics[id] = newTopic(id)
}
topics = append(topics, s.topics[id])
}
return topics, nil
}
func (s *Server) updateStatsAndPrune() {
log.Debug("Manager: Starting")
defer log.Debug("Manager: Finished")
// WARNING: Make sure to only selectively lock with the mutex, and be aware that this
// there is no mutex for the entire function.
// Expire visitors from rate visitors map
s.mu.Lock()
staleVisitors := 0
for ip, v := range s.visitors {
if v.Stale() {
log.Trace("Deleting stale visitor %s", v.ip)
delete(s.visitors, ip)
staleVisitors++
}
}
s.mu.Unlock()
log.Debug("Manager: Deleted %d stale visitor(s)", staleVisitors)
// Delete expired attachments
if s.fileCache != nil && s.config.AttachmentExpiryDuration > 0 {
olderThan := time.Now().Add(-1 * s.config.AttachmentExpiryDuration)
ids, err := s.fileCache.Expired(olderThan)
if err != nil {
log.Warn("Error retrieving expired attachments: %s", err.Error())
} else if len(ids) > 0 {
log.Debug("Manager: Deleting expired attachments: %v", ids)
if err := s.fileCache.Remove(ids...); err != nil {
log.Warn("Error deleting attachments: %s", err.Error())
}
} else {
log.Debug("Manager: No expired attachments to delete")
}
}
// Prune message cache
olderThan := time.Now().Add(-1 * s.config.CacheDuration)
log.Debug("Manager: Pruning messages older than %s", olderThan.Format("2006-01-02 15:04:05"))
if err := s.messageCache.Prune(olderThan); err != nil {
log.Warn("Manager: Error pruning cache: %s", err.Error())
}
// Message count per topic
var messages int
messageCounts, err := s.messageCache.MessageCounts()
if err != nil {
log.Warn("Manager: Cannot get message counts: %s", err.Error())
messageCounts = make(map[string]int) // Empty, so we can continue
}
for _, count := range messageCounts {
messages += count
}
// Remove subscriptions without subscribers
s.mu.Lock()
var subscribers int
for _, t := range s.topics {
subs := t.SubscribersCount()
msgs, exists := messageCounts[t.ID]
if subs == 0 && (!exists || msgs == 0) {
log.Trace("Deleting empty topic %s", t.ID)
delete(s.topics, t.ID)
continue
}
subscribers += subs
}
s.mu.Unlock()
// Mail stats
var receivedMailTotal, receivedMailSuccess, receivedMailFailure int64
if s.smtpServerBackend != nil {
receivedMailTotal, receivedMailSuccess, receivedMailFailure = s.smtpServerBackend.Counts()
}
var sentMailTotal, sentMailSuccess, sentMailFailure int64
if s.smtpSender != nil {
sentMailTotal, sentMailSuccess, sentMailFailure = s.smtpSender.Counts()
}
// Print stats
s.mu.Lock()
messagesCount, topicsCount, visitorsCount := s.messages, len(s.topics), len(s.visitors)
s.mu.Unlock()
log.Info("Stats: %d messages published, %d in cache, %d topic(s) active, %d subscriber(s), %d visitor(s), %d mails received (%d successful, %d failed), %d mails sent (%d successful, %d failed)",
messagesCount, messages, topicsCount, subscribers, visitorsCount,
receivedMailTotal, receivedMailSuccess, receivedMailFailure,
sentMailTotal, sentMailSuccess, sentMailFailure)
}
func (s *Server) runSMTPServer() error {
s.smtpServerBackend = newMailBackend(s.config, s.handle)
s.smtpServer = smtp.NewServer(s.smtpServerBackend)
s.smtpServer.Addr = s.config.SMTPServerListen
s.smtpServer.Domain = s.config.SMTPServerDomain
s.smtpServer.ReadTimeout = 10 * time.Second
s.smtpServer.WriteTimeout = 10 * time.Second
s.smtpServer.MaxMessageBytes = 1024 * 1024 // Must be much larger than message size (headers, multipart, etc.)
s.smtpServer.MaxRecipients = 1
s.smtpServer.AllowInsecureAuth = true
return s.smtpServer.ListenAndServe()
}
func (s *Server) runManager() {
for {
select {
case <-time.After(s.config.ManagerInterval):
s.updateStatsAndPrune()
case <-s.closeChan:
return
}
}
}
func (s *Server) runFirebaseKeepaliver() {
if s.firebaseClient == nil {
return
}
v := newVisitor(s.config, s.messageCache, netip.IPv4Unspecified()) // Background process, not a real visitor, uses IP 0.0.0.0
for {
select {
case <-time.After(s.config.FirebaseKeepaliveInterval):
s.sendToFirebase(v, newKeepaliveMessage(firebaseControlTopic))
case <-time.After(s.config.FirebasePollInterval):
s.sendToFirebase(v, newKeepaliveMessage(firebasePollTopic))
case <-s.closeChan:
return
}
}
}
func (s *Server) runDelayedSender() {
for {
select {
case <-time.After(s.config.DelayedSenderInterval):
if err := s.sendDelayedMessages(); err != nil {
log.Warn("Error sending delayed messages: %s", err.Error())
}
case <-s.closeChan:
return
}
}
}
func (s *Server) sendDelayedMessages() error {
messages, err := s.messageCache.MessagesDue()
if err != nil {
return err
}
for _, m := range messages {
v := s.visitorFromIP(m.Sender)
if err := s.sendDelayedMessage(v, m); err != nil {
log.Warn("%s Error sending delayed message: %s", logMessagePrefix(v, m), err.Error())
}
}
return nil
}
func (s *Server) sendDelayedMessage(v *visitor, m *message) error {
log.Debug("%s Sending delayed message", logMessagePrefix(v, m))
s.mu.Lock()
t, ok := s.topics[m.Topic] // If no subscribers, just mark message as published
s.mu.Unlock()
if ok {
go func() {
// We do not rate-limit messages here, since we've rate limited them in the PUT/POST handler
if err := t.Publish(v, m); err != nil {
log.Warn("%s Unable to publish message: %v", logMessagePrefix(v, m), err.Error())
}
}()
}
if s.firebaseClient != nil { // Firebase subscribers may not show up in topics map
go s.sendToFirebase(v, m)
}
if s.config.UpstreamBaseURL != "" {
go s.forwardPollRequest(v, m)
}
if err := s.messageCache.MarkPublished(m); err != nil {
return err
}
return nil
}
func (s *Server) limitRequests(next handleFunc) handleFunc {
return func(w http.ResponseWriter, r *http.Request, v *visitor) error {
if util.ContainsIP(s.config.VisitorRequestExemptIPAddrs, v.ip) {
return next(w, r, v)
} else if err := v.RequestAllowed(); err != nil {
return errHTTPTooManyRequestsLimitRequests
}
return next(w, r, v)
}
}
func (s *Server) ensureWebEnabled(next handleFunc) handleFunc {
return func(w http.ResponseWriter, r *http.Request, v *visitor) error {
if !s.config.EnableWeb {
return errHTTPNotFound
}
return next(w, r, v)
}
}
// transformBodyJSON peeks the request body, reads the JSON, and converts it to headers
// before passing it on to the next handler. This is meant to be used in combination with handlePublish.
func (s *Server) transformBodyJSON(next handleFunc) handleFunc {
return func(w http.ResponseWriter, r *http.Request, v *visitor) error {
body, err := util.Peek(r.Body, s.config.MessageLimit)
if err != nil {
return err
}
defer r.Body.Close()
var m publishMessage
if err := json.NewDecoder(body).Decode(&m); err != nil {
return errHTTPBadRequestJSONInvalid
}
if !topicRegex.MatchString(m.Topic) {
return errHTTPBadRequestTopicInvalid
}
if m.Message == "" {
m.Message = emptyMessageBody
}
r.URL.Path = "/" + m.Topic
r.Body = io.NopCloser(strings.NewReader(m.Message))
if m.Title != "" {
r.Header.Set("X-Title", m.Title)
}
if m.Priority != 0 {
r.Header.Set("X-Priority", fmt.Sprintf("%d", m.Priority))
}
if m.Tags != nil && len(m.Tags) > 0 {
r.Header.Set("X-Tags", strings.Join(m.Tags, ","))
}
if m.Attach != "" {
r.Header.Set("X-Attach", m.Attach)
}
if m.Filename != "" {
r.Header.Set("X-Filename", m.Filename)
}
if m.Click != "" {
r.Header.Set("X-Click", m.Click)
}
if m.Icon != "" {
r.Header.Set("X-Icon", m.Icon)
}
if len(m.Actions) > 0 {
actionsStr, err := json.Marshal(m.Actions)
if err != nil {
return errHTTPBadRequestJSONInvalid
}
r.Header.Set("X-Actions", string(actionsStr))
}
if m.Email != "" {
r.Header.Set("X-Email", m.Email)
}
if m.Delay != "" {
r.Header.Set("X-Delay", m.Delay)
}
return next(w, r, v)
}
}
func (s *Server) transformMatrixJSON(next handleFunc) handleFunc {
return func(w http.ResponseWriter, r *http.Request, v *visitor) error {
newRequest, err := newRequestFromMatrixJSON(r, s.config.BaseURL, s.config.MessageLimit)
if err != nil {
return err
}
if err := next(w, newRequest, v); err != nil {
return &errMatrix{pushKey: newRequest.Header.Get(matrixPushKeyHeader), err: err}
}
return nil
}
}
func (s *Server) authWrite(next handleFunc) handleFunc {
return s.withAuth(next, auth.PermissionWrite)
}
func (s *Server) authRead(next handleFunc) handleFunc {
return s.withAuth(next, auth.PermissionRead)
}
func (s *Server) withAuth(next handleFunc, perm auth.Permission) handleFunc {
return func(w http.ResponseWriter, r *http.Request, v *visitor) error {
if s.auth == nil {
return next(w, r, v)
}
topics, _, err := s.topicsFromPath(r.URL.Path)
if err != nil {
return err
}
var user *auth.User // may stay nil if no auth header!
username, password, ok := extractUserPass(r)
if ok {
if user, err = s.auth.Authenticate(username, password); err != nil {
log.Info("authentication failed: %s", err.Error())
return errHTTPUnauthorized
}
}
for _, t := range topics {
if err := s.auth.Authorize(user, t.ID, perm); err != nil {
log.Info("unauthorized: %s", err.Error())
return errHTTPForbidden
}
}
return next(w, r, v)
}
}
// extractUserPass reads the username/password from the basic auth header (Authorization: Basic ...),
// or from the ?auth=... query param. The latter is required only to support the WebSocket JavaScript
// class, which does not support passing headers during the initial request. The auth query param
// is effectively double base64 encoded. Its format is base64(Basic base64(user:pass)).
func extractUserPass(r *http.Request) (username string, password string, ok bool) {
username, password, ok = r.BasicAuth()
if ok {
return
}
authParam := readQueryParam(r, "authorization", "auth")
if authParam != "" {
a, err := base64.RawURLEncoding.DecodeString(authParam)
if err != nil {
return
}
r.Header.Set("Authorization", string(a))
return r.BasicAuth()
}
return
}
// visitor creates or retrieves a rate.Limiter for the given visitor.
// This function was taken from https://www.alexedwards.net/blog/how-to-rate-limit-http-requests (MIT).
func (s *Server) visitor(r *http.Request) *visitor {
remoteAddr := r.RemoteAddr
addrPort, err := netip.ParseAddrPort(remoteAddr)
ip := addrPort.Addr()
if err != nil {
// This should not happen in real life; only in tests. So, using falling back to 0.0.0.0 if address unspecified
ip, err = netip.ParseAddr(remoteAddr)
if err != nil {
ip = netip.IPv4Unspecified()
log.Warn("unable to parse IP (%s), new visitor with unspecified IP (0.0.0.0) created %s", remoteAddr, err)
}
}
if s.config.BehindProxy && strings.TrimSpace(r.Header.Get("X-Forwarded-For")) != "" {
// X-Forwarded-For can contain multiple addresses (see #328). If we are behind a proxy,
// only the right-most address can be trusted (as this is the one added by our proxy server).
// See https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For for details.
ips := util.SplitNoEmpty(r.Header.Get("X-Forwarded-For"), ",")
realIP, err := netip.ParseAddr(strings.TrimSpace(util.LastString(ips, remoteAddr)))
if err != nil {
log.Error("invalid IP address %s received in X-Forwarded-For header: %s", ip, err.Error())
// Fall back to regular remote address if X-Forwarded-For is damaged
} else {
ip = realIP
}
}
return s.visitorFromIP(ip)
}
func (s *Server) visitorFromIP(ip netip.Addr) *visitor {
s.mu.Lock()
defer s.mu.Unlock()
v, exists := s.visitors[ip]
if !exists {
s.visitors[ip] = newVisitor(s.config, s.messageCache, ip)
return s.visitors[ip]
}
v.Keepalive()
return v
}