Ilia Denisov
7a48327ab6
- PLAN.md: new Stage 8 (UI social/account/history); Telegram->9, Admin->10, Linking->11, Polish->12; tracker + Stage 7 refinements; split the Stage 6 'wired in Stage 7' note between 7 and 8 - ARCHITECTURE: promote ui to current (slice scope, board-replay, codegen, theming, mock) - FUNCTIONAL(+ru): client-app section with the Stage 7/8 split - README + ui/README + CLAUDE.md: UI build/run/test, codegen, pnpm notes - bumped Stage 8-11 refs (+1) across docs and code comments
65 lines
2.1 KiB
Go
65 lines
2.1 KiB
Go
// Package admin is the gateway's admin surface: HTTP Basic-Auth in front of a
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// reverse proxy to the backend admin API (docs/ARCHITECTURE.md §12). The gateway
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// validates the operator credential and forwards authenticated requests to
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// backend /api/v1/admin/*; the backend trusts the gateway on this segment. The
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// admin API itself is filled in Stage 10.
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package admin
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import (
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"crypto/subtle"
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"fmt"
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"net/http"
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"net/http/httputil"
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"net/url"
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"strings"
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"go.uber.org/zap"
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)
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// backendAdminPrefix is where the backend mounts its admin API.
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const backendAdminPrefix = "/api/v1/admin"
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// NewProxy returns a handler that checks Basic-Auth against user/password and
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// reverse-proxies the request to the backend admin API, mapping an inbound
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// /admin/<rest> path to <backendURL>/api/v1/admin/<rest>.
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func NewProxy(backendURL, user, password string, log *zap.Logger) (http.Handler, error) {
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target, err := url.Parse(backendURL)
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if err != nil {
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return nil, fmt.Errorf("admin: parse backend url %q: %w", backendURL, err)
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}
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if log == nil {
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log = zap.NewNop()
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}
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proxy := &httputil.ReverseProxy{
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Rewrite: func(pr *httputil.ProxyRequest) {
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pr.SetURL(target)
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rel := strings.TrimPrefix(pr.In.URL.Path, "/admin")
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pr.Out.URL.Path = backendAdminPrefix + rel
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pr.Out.Host = pr.In.Host
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},
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ErrorHandler: func(w http.ResponseWriter, r *http.Request, err error) {
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log.Warn("admin proxy upstream error", zap.String("path", r.URL.Path), zap.Error(err))
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w.WriteHeader(http.StatusBadGateway)
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},
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}
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return basicAuth(user, password, proxy), nil
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}
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// basicAuth wraps next with a constant-time Basic-Auth check.
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func basicAuth(user, password string, next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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u, p, ok := r.BasicAuth()
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if !ok || !equal(u, user) || !equal(p, password) {
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w.Header().Set("WWW-Authenticate", `Basic realm="scrabble-admin"`)
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http.Error(w, "unauthorized", http.StatusUnauthorized)
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return
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}
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next.ServeHTTP(w, r)
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})
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}
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// equal compares two strings in constant time.
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func equal(a, b string) bool {
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return subtle.ConstantTimeCompare([]byte(a), []byte(b)) == 1
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}
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