Move webhook pages to /hook/ID and inbound URLs to /h/UUID (closes #367)

The webhook page and everything under it move from /source/ID to
/hook/ID, the list and new-webhook form to /hooks and /hooks/new, and
the event log from .../logs to /hook/ID/events, body download
included. Entrypoint URLs move from /webhook/UUID to /h/UUID, and the
webhook page shows only that form. The old paths are gone.

Links, redirects, form actions, tests, comments and the README follow.
Both links to the event log page, and its title and heading, now read
"Full Event Log". Go identifiers and template file names are
unchanged. A new route test posts to the entrypoint URL the webhook
page shows and checks that the receiver rate limit applies to it.

Model: opus-5-5

internal/server/routes_test.go

@@ -674,7 +674,7 @@ func TestPagesLogin_CookiesFromAnEarlierDatabase(t *testing.T) {
 
 	require.NotNil(t, fresh, "login must set a session cookie")
 	assert.Equal(
-		t, "/sources",
+		t, "/hooks",
 		env.get("/", []*http.Cookie{fresh}).Header().Get("Location"),
 		"the new session cookie must authenticate",
 	)
@@ -741,7 +741,7 @@ func TestPasswordChange_UnderLimit_Succeeds(t *testing.T) {
 	)
 }
 
-// --- /source/{sourceID} group ---
+// --- /hook/{sourceID} group ---
 
 // TestSourceLogs_TruncationLinkDownloadsTheBody walks the whole
 // feature the way a user does: render the event log page through
@@ -769,11 +769,11 @@ func TestSourceLogs_TruncationLinkDownloadsTheBody(t *testing.T) {
 	wh := env.seedWebhook(t, userID)
 	env.seedEvent(t, wh.ID, stored)
 
-	page := env.get("/source/"+wh.ID+"/logs", cookies)
+	page := env.get("/hook/"+wh.ID+"/events", cookies)
 	require.Equal(t, http.StatusOK, page.Code)
 
 	link := regexp.MustCompile(
-		`href="(/source/[^"]+/body)"`,
+		`href="(/hook/[^"]+/body)"`,
 	).FindStringSubmatch(page.Body.String())
 	require.Len(
 		t, link, 2,
@@ -819,7 +819,7 @@ func TestSourceLogsBody_OtherUser404s(t *testing.T) {
 	const payload = "OWNERS-PAYLOAD-77c1"
 
 	evt := env.seedEvent(t, wh.ID, payload)
-	path := "/source/" + wh.ID + "/logs/" + evt.ID + "/body"
+	path := "/hook/" + wh.ID + "/events/" + evt.ID + "/body"
 
 	intruderID, _ := env.seedUser(t, "intruder", "somepassword")
 	intruder := env.authCookies(t, intruderID, "intruder")
@@ -853,7 +853,7 @@ func TestDeliveryReplay_PostOnlyAndCSRFProtected(t *testing.T) {
 	evt := env.seedEvent(t, wh.ID, `{"replay":"me"}`)
 	dlv := env.seedFailedDelivery(t, wh.ID, evt.ID, tgt.ID)
 
-	path := "/source/" + wh.ID + "/deliveries/" + dlv.ID +
+	path := "/hook/" + wh.ID + "/deliveries/" + dlv.ID +
 		"/replay"
 
 	assert.Equal(
@@ -879,7 +879,7 @@ func TestDeliveryReplay_PostOnlyAndCSRFProtected(t *testing.T) {
 	// The token and the action URL both come out of the rendered
 	// page, so a typo in either the route pattern or the template
 	// fails here.
-	logsPath := "/source/" + wh.ID + "/logs"
+	logsPath := "/hook/" + wh.ID + "/events"
 
 	token, cookies := env.csrfFrom(t, logsPath, cookies)
 
@@ -887,7 +887,7 @@ func TestDeliveryReplay_PostOnlyAndCSRFProtected(t *testing.T) {
 	require.Equal(t, http.StatusOK, page.Code)
 
 	action := regexp.MustCompile(
-		`action="(/source/[^"]+/replay)"`,
+		`action="(/hook/[^"]+/replay)"`,
 	).FindStringSubmatch(page.Body.String())
 	require.Len(
 		t, action, 2,
@@ -912,6 +912,59 @@ func TestDeliveryReplay_PostOnlyAndCSRFProtected(t *testing.T) {
 	)
 }
 
+// --- /h/{uuid} receiver ---
+
+// TestReceiver_EntrypointURLIsRateLimited takes the entrypoint URL
+// the webhook page shows and posts to it through the production
+// router until the receiver rate limit refuses it. The URL has to
+// reach the receiver, and the limit has to apply to it.
+func TestReceiver_EntrypointURLIsRateLimited(t *testing.T) {
+	t.Parallel()
+
+	const limit = 2
+
+	env := newTestEnvWithConfig(t, &config.Config{
+		DataDir:           t.TempDir(),
+		Environment:       config.EnvironmentDev,
+		ReceiverRateLimit: limit,
+	})
+
+	userID, _ := env.seedUser(t, "receiver", "somepassword")
+	cookies := env.authCookies(t, userID, "receiver")
+
+	wh := env.seedWebhook(t, userID)
+	require.NoError(t, env.db.DB().Omit(clause.Associations).Create(
+		&database.Entrypoint{
+			WebhookID: wh.ID,
+			Path:      "6f1e2a9c-4b7d-4e3a-9c2f-1d8b5a7e3c60",
+			Active:    true,
+		},
+	).Error)
+
+	page := env.get("/hook/"+wh.ID, cookies)
+	require.Equal(t, http.StatusOK, page.Code)
+
+	shown := regexp.MustCompile(`(/h/[^<]+)</code>`).
+		FindStringSubmatch(page.Body.String())
+	require.Len(
+		t, shown, 2, "the webhook page should show the entrypoint URL",
+	)
+
+	for i := range limit {
+		assert.Equal(
+			t, http.StatusOK,
+			env.post(shown[1], url.Values{}, nil).Code,
+			"request %d should reach the receiver", i,
+		)
+	}
+
+	assert.Equal(
+		t, http.StatusTooManyRequests,
+		env.post(shown[1], url.Values{}, nil).Code,
+		"the receiver rate limit must apply to the entrypoint URL",
+	)
+}
+
 // metricsConfig is a Config differing from the routing default only
 // in the two /metrics credentials.
 func metricsConfig(