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ed0f56f144
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/metrics is behind a password, and REPO_POLICIES.md requires rate limiting on password logins. Each client address may now send it 30 requests a minute, counted by httprate before Basic Auth, so failed logins use up the allowance and a request over it gets 429 without the password being checked. The address is the one the existing trusted-proxy logic in internal/middleware works out, with IPv6 addresses grouped by /64; an IPv4 address a proxy reports in IPv6-mapped form counts as the plain IPv4 address. A Prometheus server scraping every 15 seconds sends 4 requests a minute. Model: opus-5-5
78 lines
2.2 KiB
Go
78 lines
2.2 KiB
Go
package server
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import (
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"net/http"
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"time"
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"github.com/go-chi/chi/v5"
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chimw "github.com/go-chi/chi/v5/middleware"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"sneak.berlin/go/dnswatcher/static"
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)
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// requestTimeout is the maximum duration for handling a request.
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const requestTimeout = 60 * time.Second
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// SetupRoutes configures all HTTP routes.
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func (s *Server) SetupRoutes() {
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s.router = chi.NewRouter()
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// Global middleware
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s.router.Use(chimw.Recoverer)
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s.router.Use(chimw.RequestID)
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s.router.Use(s.mw.SecurityHeaders())
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s.router.Use(s.mw.Logging())
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s.router.Use(chimw.Timeout(requestTimeout))
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// Public, unauthenticated, read-only routes, the only ones
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// REPO_POLICIES.md allows wildcard CORS on. CORS is middleware of
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// this whole router, not of a Group, so that it also answers
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// OPTIONS preflight requests, which no route here registers.
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public := chi.NewRouter()
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public.Use(s.mw.CORS())
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// Dashboard (read-only web UI)
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public.Get("/", s.handlers.HandleDashboard())
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// Static assets (embedded CSS/JS)
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public.Mount(
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"/s",
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http.StripPrefix(
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"/s",
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http.FileServer(http.FS(static.Static)),
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),
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)
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// Health check (standard well-known path)
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public.Get(
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"/.well-known/healthcheck",
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s.handlers.HandleHealthCheck(),
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)
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// Legacy health check (keep for backward compatibility)
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public.Get("/health", s.handlers.HandleHealthCheck())
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// API v1 routes
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public.Route("/api/v1", func(r chi.Router) {
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r.Get("/status", s.handlers.HandleStatus())
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})
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s.router.Mount("/", public)
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// Metrics endpoint (optional, with basic auth) and no CORS: a
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// Prometheus scraper is not a browser. It is mounted rather than
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// added with Get so that every method on /metrics, OPTIONS
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// included, ends here instead of falling through to the public
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// router and its CORS. The rate limit comes before Basic Auth, so
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// failed logins count against it and a request over the limit
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// never reaches the password check.
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if s.params.Config.MetricsUsername != "" {
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metrics := chi.NewRouter()
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metrics.Use(s.mw.MetricsRateLimit())
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metrics.Use(s.mw.MetricsAuth())
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metrics.Get("/", promhttp.Handler().ServeHTTP)
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s.router.Mount("/metrics", metrics)
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}
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}
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