add users logic

coordinator/internal/authctx/authctx.go

@@ -0,0 +1,37 @@
+// Package authctx carries the authenticated requester across the transport and
+// use-case layers without either one importing the other. The HTTP middleware
+// stamps a Requester after verifying a user's JWT; the job use cases read it to
+// record ownership and to enforce that a non-admin only touches their own jobs.
+package authctx
+
+import (
+	"context"
+
+	"github.com/google/uuid"
+)
+
+// Requester is the identity behind a request, derived from a verified JWT.
+// A request authenticated only by the shared worker/service token carries no
+// Requester at all (From returns ok=false), which is how worker traffic and
+// legacy unauthenticated-user traffic stay owner-less.
+type Requester struct {
+	UserID uuid.UUID
+	Role   string
+}
+
+// IsAdmin reports whether the requester may act on any user's jobs.
+func (r Requester) IsAdmin() bool { return r.Role == "admin" }
+
+type ctxKey struct{}
+
+// With returns a copy of ctx carrying r.
+func With(ctx context.Context, r Requester) context.Context {
+	return context.WithValue(ctx, ctxKey{}, r)
+}
+
+// From returns the requester stamped by the middleware, or ok=false when the
+// request was not authenticated as a user.
+func From(ctx context.Context) (Requester, bool) {
+	r, ok := ctx.Value(ctxKey{}).(Requester)
+	return r, ok
+}