241 lines
7.7 KiB
Go
241 lines
7.7 KiB
Go
package httpserver
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import (
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"bufio"
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"fmt"
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"net"
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"net/http"
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"strings"
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"time"
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"github.com/go-chi/chi/v5/middleware"
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"github.com/tim/cairnquire/apps/server/internal/auth"
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)
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const devLogoutCookieName = "cairnquire_dev_logout"
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func (s *Server) timeoutExceptWebSocket(timeout time.Duration) func(http.Handler) http.Handler {
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timeoutMiddleware := middleware.Timeout(timeout)
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if r.URL.Path == "/ws" {
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next.ServeHTTP(w, r)
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return
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}
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timeoutMiddleware(next).ServeHTTP(w, r)
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})
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}
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}
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func (s *Server) requestLogger(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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ww := &statusWriter{ResponseWriter: w, status: http.StatusOK}
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start := time.Now()
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next.ServeHTTP(ww, r)
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s.logger.Info("http request",
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"method", r.Method,
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"path", r.URL.Path,
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"status", ww.status,
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"duration", time.Since(start).String(),
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)
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})
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}
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func (s *Server) securityHeaders(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Security-Policy", "default-src 'self'; base-uri 'self'; frame-ancestors 'none'; img-src 'self' data:; style-src 'self' 'unsafe-inline' https://cdn.jsdelivr.net; script-src 'self' https://cdn.jsdelivr.net; font-src 'self' https://cdn.jsdelivr.net; connect-src 'self' ws: wss:; object-src 'none'")
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w.Header().Set("Referrer-Policy", "strict-origin-when-cross-origin")
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w.Header().Set("X-Content-Type-Options", "nosniff")
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w.Header().Set("X-Frame-Options", "DENY")
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w.Header().Set("Cross-Origin-Opener-Policy", "same-origin")
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w.Header().Set("Cross-Origin-Resource-Policy", "same-origin")
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next.ServeHTTP(w, r)
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})
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}
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func (s *Server) authMiddleware(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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principal, ok := s.authenticateRequest(r)
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if ok {
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r = r.WithContext(withPrincipal(r.Context(), principal))
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}
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required, protected := requiredScopeForPath(r)
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if !protected {
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next.ServeHTTP(w, r)
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return
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}
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if !ok {
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if r.Method == http.MethodGet && !strings.HasPrefix(r.URL.Path, "/api/") {
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http.Redirect(w, r, "/login?next="+urlQueryEscape(r.URL.RequestURI()), http.StatusSeeOther)
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return
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}
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writeJSONWithStatus(w, http.StatusUnauthorized, map[string]string{"error": "authentication required"})
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return
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}
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if !allowsProtectedRoute(principal, required) {
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writeJSONWithStatus(w, http.StatusForbidden, map[string]string{"error": "forbidden"})
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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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func allowsProtectedRoute(principal auth.Principal, required auth.Scope) bool {
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if required == auth.ScopeAdmin {
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return auth.Allows(principal, required)
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}
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if len(principal.Scopes) > 0 {
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return auth.HasScope(principal.Scopes, required)
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}
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return principal.UserID != ""
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}
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func urlQueryEscape(value string) string {
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return strings.NewReplacer("%", "%25", " ", "%20", "?", "%3F", "&", "%26", "=", "%3D", "#", "%23").Replace(value)
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}
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func (s *Server) setupMiddleware(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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settings, err := s.auth.GetInstanceSettings(r.Context())
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if err != nil {
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writeJSONWithStatus(w, http.StatusInternalServerError, map[string]string{"error": "lookup initial setup state"})
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return
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}
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if settings.SetupComplete || isSetupAllowedPath(r.URL.Path) {
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next.ServeHTTP(w, r)
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return
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}
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if r.Method == http.MethodGet && !strings.HasPrefix(r.URL.Path, "/api/") {
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http.Redirect(w, r, "/setup", http.StatusSeeOther)
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return
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}
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writeJSONWithStatus(w, http.StatusServiceUnavailable, map[string]string{"error": "initial setup is required"})
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})
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}
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func isSetupAllowedPath(path string) bool {
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return path == "/setup" ||
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path == "/api/setup" ||
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path == "/health" ||
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path == "/healthz" ||
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path == "/readyz" ||
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path == "/sw.js" ||
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strings.HasPrefix(path, "/static/")
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}
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func (s *Server) authenticateRequest(r *http.Request) (auth.Principal, bool) {
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var token string
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if header := r.Header.Get("Authorization"); strings.HasPrefix(header, "Bearer ") {
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token = strings.TrimSpace(strings.TrimPrefix(header, "Bearer "))
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} else if r.URL.Path == "/ws" {
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token = r.URL.Query().Get("token")
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}
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if token != "" {
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if s.config.DevMode && token == "dev" {
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principal, err := s.auth.PrincipalForUser(r.Context(), s.devUserID)
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return principal, err == nil
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}
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principal, err := s.auth.ValidateBearerToken(r.Context(), token)
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if err == nil {
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return principal, true
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}
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s.logger.Warn("invalid bearer token", "error", err)
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return auth.Principal{}, false
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}
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cookie, err := r.Cookie(auth.SessionCookieName)
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if err != nil || cookie.Value == "" {
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if s.devUserID == "" || hasDevLogoutCookie(r) {
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return auth.Principal{}, false
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}
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principal, err := s.auth.PrincipalForUser(r.Context(), s.devUserID)
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return principal, err == nil
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}
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principal, err := s.auth.ValidateSessionToken(r.Context(), cookie.Value)
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if err != nil {
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return auth.Principal{}, false
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}
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return principal, true
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}
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func hasDevLogoutCookie(r *http.Request) bool {
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cookie, err := r.Cookie(devLogoutCookieName)
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return err == nil && cookie.Value == "1"
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}
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func requiredScopeForPath(r *http.Request) (auth.Scope, bool) {
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path := r.URL.Path
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method := r.Method
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switch {
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case path == "/" || (path == "/permissions" && method == http.MethodGet):
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return auth.ScopeDocsRead, true
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case path == "/permissions" && method == http.MethodPost:
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return auth.ScopeDocsWrite, true
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case strings.HasPrefix(path, "/api/auth/"):
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if path == "/api/auth/me" || path == "/api/auth/logout" || path == "/api/auth/password/change" || path == "/api/auth/account" || strings.HasPrefix(path, "/api/auth/passkeys/me/") {
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return auth.ScopeDocsRead, true
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}
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return "", false
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case strings.HasPrefix(path, "/api/device/"):
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if path == "/api/device/approve" || path == "/api/device/verify" {
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return auth.ScopeDocsRead, true
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}
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return "", false
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case strings.HasPrefix(path, "/api/tokens"):
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return auth.ScopeDocsRead, true
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case path == "/ws":
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return auth.ScopeDocsRead, true
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case strings.HasPrefix(path, "/api/admin/"):
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return auth.ScopeAdmin, true
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case strings.HasPrefix(path, "/api/documents/") && method != http.MethodGet:
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return auth.ScopeDocsWrite, true
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case path == "/api/documents" || path == "/api/search" || (path == "/api/permissions" && method == http.MethodGet):
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return auth.ScopeDocsRead, true
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case path == "/api/permissions" && method == http.MethodPatch:
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return auth.ScopeDocsWrite, true
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case strings.HasPrefix(path, "/api/uploads"):
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return auth.ScopeDocsWrite, true
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case path == "/api/attachments":
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return auth.ScopeDocsRead, true
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case strings.HasPrefix(path, "/api/sync/"):
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if method == http.MethodPost {
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return auth.ScopeSyncWrite, true
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}
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return auth.ScopeSyncRead, true
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case strings.HasPrefix(path, "/api/content/"):
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return auth.ScopeSyncRead, true
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case strings.HasPrefix(path, "/api/comments"):
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return auth.ScopeDocsRead, true
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case strings.HasPrefix(path, "/api/notifications"):
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return auth.ScopeDocsRead, true
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case strings.HasPrefix(path, "/api/watch"):
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return auth.ScopeDocsRead, true
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case path == "/docs" || strings.HasPrefix(path, "/docs/"):
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return auth.ScopeDocsRead, true
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case strings.HasSuffix(path, "/edit"):
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return auth.ScopeDocsWrite, true
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default:
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return "", false
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}
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}
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type statusWriter struct {
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http.ResponseWriter
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status int
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}
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func (w *statusWriter) WriteHeader(status int) {
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w.status = status
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w.ResponseWriter.WriteHeader(status)
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}
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func (w *statusWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
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hijacker, ok := w.ResponseWriter.(http.Hijacker)
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if !ok {
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return nil, nil, fmt.Errorf("response writer does not support hijacking")
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}
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return hijacker.Hijack()
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}
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