88 lines
1.9 KiB
Go
88 lines
1.9 KiB
Go
package server
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import (
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"errors"
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"golang.org/x/time/rate"
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"heckel.io/ntfy/util"
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"sync"
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"time"
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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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)
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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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ip string
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requests *rate.Limiter
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subscriptions util.Limiter
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emails *rate.Limiter
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seen time.Time
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mu sync.Mutex
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}
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func newVisitor(conf *Config, ip string) *visitor {
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return &visitor{
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config: conf,
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ip: ip,
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requests: rate.NewLimiter(rate.Every(conf.VisitorRequestLimitReplenish), conf.VisitorRequestLimitBurst),
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subscriptions: util.NewFixedLimiter(int64(conf.VisitorSubscriptionLimit)),
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emails: rate.NewLimiter(rate.Every(conf.VisitorEmailLimitReplenish), conf.VisitorEmailLimitBurst),
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seen: time.Now(),
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}
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}
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func (v *visitor) IP() string {
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return v.ip
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}
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func (v *visitor) RequestAllowed() error {
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if !v.requests.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) EmailAllowed() error {
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if !v.emails.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.subscriptions.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.subscriptions.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) 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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