move hpke public key handler out of internal (#4065)

pkg/hpke/handlers/hpke_public_key_test.go

@@ -0,0 +1,34 @@
+package handlers_test
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/pomerium/pomerium/pkg/hpke"
+	"github.com/pomerium/pomerium/pkg/hpke/handlers"
+)
+
+func TestHPKEPublicKeyHandler(t *testing.T) {
+	t.Parallel()
+
+	k1 := hpke.DerivePrivateKey([]byte("TEST"))
+
+	t.Run("cors", func(t *testing.T) {
+		w := httptest.NewRecorder()
+		r := httptest.NewRequest(http.MethodOptions, "/", nil)
+		r.Header.Set("Origin", "https://www.example.com")
+		r.Header.Set("Access-Control-Request-Method", "GET")
+		handlers.HPKEPublicKeyHandler(k1.PublicKey()).ServeHTTP(w, r)
+		assert.Equal(t, http.StatusNoContent, w.Result().StatusCode)
+	})
+	t.Run("keys", func(t *testing.T) {
+		w := httptest.NewRecorder()
+		r := httptest.NewRequest(http.MethodGet, "/", nil)
+		handlers.HPKEPublicKeyHandler(k1.PublicKey()).ServeHTTP(w, r)
+
+		assert.Equal(t, k1.PublicKey().Bytes(), w.Body.Bytes())
+	})
+}