4eadb91a64
- Added rate limiting for outbound email sends to prevent abuse, implemented in `internal/api/mail/sendguard`. - Introduced idempotency key support for email sending to avoid duplicate submissions. - Enhanced attachment handling with new limits and validation in `internal/api/mail/limits`. - Updated outbox processing to include retry logic and circuit breaker for SMTP failures. - Improved HTML sanitization for email content to enhance security. - Added unit tests for new features, ensuring robust functionality and error handling. - Updated configuration options in `.env.example` for new mail settings.
56 lines
1009 B
Go
56 lines
1009 B
Go
package sendguard
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import (
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"errors"
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"sync"
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"time"
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"golang.org/x/time/rate"
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)
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var ErrSendRateLimited = errors.New("send rate limited")
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// RateLimiter limits outbound send API requests per user.
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type RateLimiter struct {
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mu sync.Mutex
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limits map[string]*rate.Limiter
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limit rate.Limit
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burst int
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}
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func NewRateLimiter(perMinute int, burst int) *RateLimiter {
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if perMinute < 1 {
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perMinute = 30
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}
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if burst < 1 {
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burst = 10
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}
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return &RateLimiter{
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limits: make(map[string]*rate.Limiter),
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limit: rate.Every(time.Minute / time.Duration(perMinute)),
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burst: burst,
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}
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}
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func (r *RateLimiter) Allow(userID string) error {
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if userID == "" {
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return ErrSendRateLimited
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}
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lim := r.limiter(userID)
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if !lim.Allow() {
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return ErrSendRateLimited
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}
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return nil
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}
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func (r *RateLimiter) limiter(userID string) *rate.Limiter {
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r.mu.Lock()
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defer r.mu.Unlock()
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lim, ok := r.limits[userID]
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if !ok {
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lim = rate.NewLimiter(r.limit, r.burst)
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r.limits[userID] = lim
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}
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return lim
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}
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