302 lines
9.1 KiB
Go
302 lines
9.1 KiB
Go
package server
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import (
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"errors"
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"heckel.io/ntfy/user"
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"net/netip"
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"sync"
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"time"
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"golang.org/x/time/rate"
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"heckel.io/ntfy/util"
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)
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const (
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// visitorExpungeAfter defines how long a visitor is active before it is removed from memory. This number
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// has to be very high to prevent e-mail abuse, but it doesn't really affect the other limits anyway, since
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// they are replenished faster (typically).
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visitorExpungeAfter = 24 * time.Hour
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// visitorDefaultReservationsLimit is the amount of topic names a user without a tier is allowed to reserve.
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// This number is zero, and changing it may have unintended consequences in the web app, or otherwise
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visitorDefaultReservationsLimit = int64(0)
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)
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var (
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errVisitorLimitReached = errors.New("limit reached")
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)
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// visitor represents an API user, and its associated rate.Limiter used for rate limiting
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type visitor struct {
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config *Config
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messageCache *messageCache
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userManager *user.Manager // May be nil!
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ip netip.Addr
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user *user.User
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messages int64 // Number of messages sent, reset every day
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emails int64 // Number of emails sent, reset every day
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requestLimiter *rate.Limiter // Rate limiter for (almost) all requests (including messages)
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messagesLimiter util.Limiter // Rate limiter for messages, may be nil
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emailsLimiter *rate.Limiter // Rate limiter for emails
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subscriptionLimiter util.Limiter // Fixed limiter for active subscriptions (ongoing connections)
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bandwidthLimiter util.Limiter // Limiter for attachment bandwidth downloads
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accountLimiter *rate.Limiter // Rate limiter for account creation
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firebase time.Time // Next allowed Firebase message
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seen time.Time // Last seen time of this visitor (needed for removal of stale visitors)
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mu sync.Mutex
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}
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type visitorInfo struct {
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Limits *visitorLimits
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Stats *visitorStats
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}
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type visitorLimits struct {
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Basis visitorLimitBasis
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MessagesLimit int64
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MessagesExpiryDuration time.Duration
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EmailsLimit int64
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ReservationsLimit int64
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AttachmentTotalSizeLimit int64
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AttachmentFileSizeLimit int64
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AttachmentExpiryDuration time.Duration
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}
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type visitorStats struct {
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Messages int64
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MessagesRemaining int64
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Emails int64
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EmailsRemaining int64
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Reservations int64
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ReservationsRemaining int64
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AttachmentTotalSize int64
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AttachmentTotalSizeRemaining int64
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}
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// visitorLimitBasis describes how the visitor limits were derived, either from a user's
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// IP address (default config), or from its tier
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type visitorLimitBasis string
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const (
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visitorLimitBasisIP = visitorLimitBasis("ip")
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visitorLimitBasisTier = visitorLimitBasis("tier")
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)
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func newVisitor(conf *Config, messageCache *messageCache, userManager *user.Manager, ip netip.Addr, user *user.User) *visitor {
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var messagesLimiter util.Limiter
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var requestLimiter, emailsLimiter, accountLimiter *rate.Limiter
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var messages, emails int64
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if user != nil {
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messages = user.Stats.Messages
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emails = user.Stats.Emails
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} else {
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accountLimiter = rate.NewLimiter(rate.Every(conf.VisitorAccountCreateLimitReplenish), conf.VisitorAccountCreateLimitBurst)
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}
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if user != nil && user.Tier != nil {
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requestLimiter = rate.NewLimiter(dailyLimitToRate(user.Tier.MessagesLimit), conf.VisitorRequestLimitBurst)
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messagesLimiter = util.NewFixedLimiter(user.Tier.MessagesLimit)
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emailsLimiter = rate.NewLimiter(dailyLimitToRate(user.Tier.EmailsLimit), conf.VisitorEmailLimitBurst)
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} else {
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requestLimiter = rate.NewLimiter(rate.Every(conf.VisitorRequestLimitReplenish), conf.VisitorRequestLimitBurst)
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emailsLimiter = rate.NewLimiter(rate.Every(conf.VisitorEmailLimitReplenish), conf.VisitorEmailLimitBurst)
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}
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return &visitor{
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config: conf,
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messageCache: messageCache,
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userManager: userManager, // May be nil
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ip: ip,
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user: user,
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messages: messages,
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emails: emails,
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requestLimiter: requestLimiter,
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messagesLimiter: messagesLimiter, // May be nil
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emailsLimiter: emailsLimiter,
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subscriptionLimiter: util.NewFixedLimiter(int64(conf.VisitorSubscriptionLimit)),
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bandwidthLimiter: util.NewBytesLimiter(conf.VisitorAttachmentDailyBandwidthLimit, 24*time.Hour),
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accountLimiter: accountLimiter, // May be nil
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firebase: time.Unix(0, 0),
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seen: time.Now(),
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}
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}
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func (v *visitor) RequestAllowed() error {
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if !v.requestLimiter.Allow() {
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return errVisitorLimitReached
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}
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return nil
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}
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func (v *visitor) FirebaseAllowed() error {
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v.mu.Lock()
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defer v.mu.Unlock()
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if time.Now().Before(v.firebase) {
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return errVisitorLimitReached
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}
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return nil
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}
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func (v *visitor) FirebaseTemporarilyDeny() {
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v.mu.Lock()
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defer v.mu.Unlock()
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v.firebase = time.Now().Add(v.config.FirebaseQuotaExceededPenaltyDuration)
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}
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func (v *visitor) MessageAllowed() error {
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if v.messagesLimiter != nil && v.messagesLimiter.Allow(1) != nil {
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return errVisitorLimitReached
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}
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return nil
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}
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func (v *visitor) EmailAllowed() error {
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if !v.emailsLimiter.Allow() {
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return errVisitorLimitReached
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}
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return nil
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}
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func (v *visitor) SubscriptionAllowed() error {
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v.mu.Lock()
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defer v.mu.Unlock()
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if err := v.subscriptionLimiter.Allow(1); err != nil {
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return errVisitorLimitReached
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}
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return nil
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}
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func (v *visitor) RemoveSubscription() {
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v.mu.Lock()
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defer v.mu.Unlock()
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v.subscriptionLimiter.Allow(-1)
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}
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func (v *visitor) Keepalive() {
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v.mu.Lock()
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defer v.mu.Unlock()
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v.seen = time.Now()
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}
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func (v *visitor) BandwidthLimiter() util.Limiter {
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return v.bandwidthLimiter
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}
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func (v *visitor) Stale() bool {
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v.mu.Lock()
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defer v.mu.Unlock()
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return time.Since(v.seen) > visitorExpungeAfter
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}
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func (v *visitor) IncrementMessages() {
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v.mu.Lock()
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defer v.mu.Unlock()
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v.messages++
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if v.user != nil {
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v.user.Stats.Messages = v.messages
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}
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}
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func (v *visitor) IncrementEmails() {
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v.mu.Lock()
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defer v.mu.Unlock()
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v.emails++
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if v.user != nil {
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v.user.Stats.Emails = v.emails
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}
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}
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func (v *visitor) ResetStats() {
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v.mu.Lock()
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defer v.mu.Unlock()
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v.messages = 0
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v.emails = 0
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if v.user != nil {
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v.user.Stats.Messages = 0
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v.user.Stats.Emails = 0
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// v.messagesLimiter = ... // FIXME
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}
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}
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func (v *visitor) Limits() *visitorLimits {
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v.mu.Lock()
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defer v.mu.Unlock()
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limits := defaultVisitorLimits(v.config)
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if v.user != nil && v.user.Tier != nil {
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limits.Basis = visitorLimitBasisTier
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limits.MessagesLimit = v.user.Tier.MessagesLimit
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limits.MessagesExpiryDuration = v.user.Tier.MessagesExpiryDuration
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limits.EmailsLimit = v.user.Tier.EmailsLimit
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limits.ReservationsLimit = v.user.Tier.ReservationsLimit
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limits.AttachmentTotalSizeLimit = v.user.Tier.AttachmentTotalSizeLimit
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limits.AttachmentFileSizeLimit = v.user.Tier.AttachmentFileSizeLimit
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limits.AttachmentExpiryDuration = v.user.Tier.AttachmentExpiryDuration
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}
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return limits
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}
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func (v *visitor) Info() (*visitorInfo, error) {
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v.mu.Lock()
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messages := v.messages
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emails := v.emails
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v.mu.Unlock()
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var attachmentsBytesUsed int64
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var err error
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if v.user != nil {
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attachmentsBytesUsed, err = v.messageCache.AttachmentBytesUsedByUser(v.user.Name)
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} else {
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attachmentsBytesUsed, err = v.messageCache.AttachmentBytesUsedBySender(v.ip.String())
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}
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if err != nil {
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return nil, err
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}
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var reservations int64
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if v.user != nil && v.userManager != nil {
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reservations, err = v.userManager.ReservationsCount(v.user.Name)
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if err != nil {
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return nil, err
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}
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}
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limits := v.Limits()
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stats := &visitorStats{
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Messages: messages,
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MessagesRemaining: zeroIfNegative(limits.MessagesLimit - messages),
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Emails: emails,
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EmailsRemaining: zeroIfNegative(limits.EmailsLimit - emails),
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Reservations: reservations,
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ReservationsRemaining: zeroIfNegative(limits.ReservationsLimit - reservations),
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AttachmentTotalSize: attachmentsBytesUsed,
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AttachmentTotalSizeRemaining: zeroIfNegative(limits.AttachmentTotalSizeLimit - attachmentsBytesUsed),
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}
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return &visitorInfo{
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Limits: limits,
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Stats: stats,
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}, nil
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}
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func zeroIfNegative(value int64) int64 {
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if value < 0 {
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return 0
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}
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return value
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}
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func replenishDurationToDailyLimit(duration time.Duration) int64 {
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return int64(24 * time.Hour / duration)
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}
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func dailyLimitToRate(limit int64) rate.Limit {
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return rate.Limit(limit) * rate.Every(24*time.Hour)
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}
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func defaultVisitorLimits(conf *Config) *visitorLimits {
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return &visitorLimits{
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Basis: visitorLimitBasisIP,
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MessagesLimit: replenishDurationToDailyLimit(conf.VisitorRequestLimitReplenish),
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MessagesExpiryDuration: conf.CacheDuration,
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EmailsLimit: replenishDurationToDailyLimit(conf.VisitorEmailLimitReplenish),
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ReservationsLimit: visitorDefaultReservationsLimit,
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AttachmentTotalSizeLimit: conf.VisitorAttachmentTotalSizeLimit,
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AttachmentFileSizeLimit: conf.AttachmentFileSizeLimit,
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AttachmentExpiryDuration: conf.AttachmentExpiryDuration,
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}
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}
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