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package ratelimiter
import (
"net/http"
"strconv"
"github.com/sirupsen/logrus"
"gitlab.com/gitlab-org/labkit/correlation"
"gitlab.com/gitlab-org/labkit/log"
"gitlab.com/gitlab-org/gitlab-pages/internal/httperrors"
"gitlab.com/gitlab-org/gitlab-pages/internal/request"
)
const (
headerGitLabRealIP = "GitLab-Real-IP"
headerXForwardedFor = "X-Forwarded-For"
headerXForwardedProto = "X-Forwarded-Proto"
)
// Middleware returns middleware for rate-limiting clients
func (rl *RateLimiter) Middleware(handler http.Handler) http.Handler {
if rl.limitPerSecond <= 0.0 {
return handler
}
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if rl.requestAllowed(r) {
handler.ServeHTTP(w, r)
return
}
rl.logRateLimitedRequest(r)
if rl.blockedCount != nil {
rl.blockedCount.WithLabelValues(strconv.FormatBool(rl.enforce)).Inc()
}
if rl.enforce {
httperrors.Serve429(w)
return
}
handler.ServeHTTP(w, r)
})
}
func (rl *RateLimiter) logRateLimitedRequest(r *http.Request) {
log.WithFields(logrus.Fields{
"rate_limiter_name": rl.name,
"correlation_id": correlation.ExtractFromContext(r.Context()),
"req_scheme": r.URL.Scheme,
"req_host": r.Host,
"req_path": r.URL.Path,
"pages_domain": request.GetHostWithoutPort(r),
"remote_addr": r.RemoteAddr,
"source_ip": request.GetRemoteAddrWithoutPort(r),
"x_forwarded_proto": r.Header.Get(headerXForwardedProto),
"x_forwarded_for": r.Header.Get(headerXForwardedFor),
"gitlab_real_ip": r.Header.Get(headerGitLabRealIP),
"rate_limiter_enabled": rl.enforce,
"rate_limiter_limit_per_second": rl.limitPerSecond,
"rate_limiter_burst_size": rl.burstSize,
}). // TODO: change to Debug with https://gitlab.com/gitlab-org/gitlab-pages/-/issues/629
Info("request hit rate limit")
}
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