0b21be6469
- TenantSlug in User-Struct + GetSessionUser per JOIN befüllt - middleware.go: RequireAuth, RequireAdmin, RequireTenantAccess - router.go: alle Routen mit passendem Middleware-Stack gesichert Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
102 lines
3.1 KiB
Go
102 lines
3.1 KiB
Go
package httpapi
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import (
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"context"
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"net/http"
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"net/url"
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"git.az-it.net/az/morz-infoboard/server/backend/internal/store"
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)
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// contextKey is an unexported type for context keys in this package.
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// Using a named type prevents collisions with keys from other packages.
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type contextKey int
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const (
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contextKeyUser contextKey = iota
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)
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// UserFromContext returns the authenticated *store.User stored in ctx,
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// or nil if none is present.
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func UserFromContext(ctx context.Context) *store.User {
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u, _ := ctx.Value(contextKeyUser).(*store.User)
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return u
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}
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// RequireAuth returns middleware that validates the morz_session cookie.
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// On success it stores the *store.User in the request context and calls next.
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// On failure it redirects to /login?next=<current-path>.
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func RequireAuth(authStore *store.AuthStore) func(http.Handler) http.Handler {
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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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cookie, err := r.Cookie("morz_session")
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if err != nil {
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redirectToLogin(w, r)
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return
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}
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user, err := authStore.GetSessionUser(r.Context(), cookie.Value)
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if err != nil {
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redirectToLogin(w, r)
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return
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}
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ctx := context.WithValue(r.Context(), contextKeyUser, user)
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next.ServeHTTP(w, r.WithContext(ctx))
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})
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}
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}
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// RequireAdmin is middleware that allows only users with role "admin".
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// It must be chained after RequireAuth (so a user is present in context).
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// On failure it responds with 403 Forbidden.
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func RequireAdmin(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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user := UserFromContext(r.Context())
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if user == nil || user.Role != "admin" {
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http.Error(w, "Forbidden", http.StatusForbidden)
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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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// RequireTenantAccess is middleware that allows access only when the
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// authenticated user belongs to the tenant identified by the {tenantSlug}
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// path value, or when the user has role "admin" (admins can access everything).
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// It must be chained after RequireAuth.
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func RequireTenantAccess(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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user := UserFromContext(r.Context())
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if user == nil {
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http.Error(w, "Forbidden", http.StatusForbidden)
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return
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}
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// Admins bypass tenant isolation.
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if user.Role == "admin" {
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next.ServeHTTP(w, r)
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return
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}
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tenantSlug := r.PathValue("tenantSlug")
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if tenantSlug != "" && user.TenantSlug != tenantSlug {
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http.Error(w, "Forbidden", http.StatusForbidden)
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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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// chain applies a list of middleware to a handler, wrapping outermost first.
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// chain(m1, m2, m3)(h) == m1(m2(m3(h)))
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func chain(h http.Handler, middlewares ...func(http.Handler) http.Handler) http.Handler {
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for i := len(middlewares) - 1; i >= 0; i-- {
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h = middlewares[i](h)
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}
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return h
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}
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// redirectToLogin issues a 303 redirect to /login with the current path as ?next=.
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func redirectToLogin(w http.ResponseWriter, r *http.Request) {
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target := "/login?next=" + url.QueryEscape(r.URL.RequestURI())
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http.Redirect(w, r, target, http.StatusSeeOther)
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}
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