Targets section: one Add, then a type and Next, then its fields (closes #370)

The webhook page's targets section lists only its targets until Add is
clicked. Add shows a choice of target type with Next; Next shows only
that type's fields, with Save and Cancel. The `database` and `log`
types have no URL field, and the `slack` form gains max retries.

A refused target now shows the webhook page again with the form open on
its type, the values entered and the reason, instead of a bare text
page. Target validation returns that message rather than writing the
response; newTarget validates a whole new target for reuse by the
new-webhook page. The edit page still answers a refusal in plain text.

Model: opus-5-5

README.md

@@ -1344,10 +1344,13 @@ markup. The CSP build runs no expressions, so every Alpine directive in
 `x-data="{ open: false }"` or `@click="open = !open"`.
 
 A browser test in `internal/server` loads the webhook page and the event log
-under the real policy and checks that: both add forms stay hidden until Add is
-clicked; choosing Slack in the add target form leaves the HTTP fields out of
-what it submits, also after leaving the page and going back to it, when the
-browser restores the choice; the Copy button beside an entrypoint URL reads
+under the real policy and checks that: the add entrypoint form stays hidden
+until Add is clicked; for every target type, the targets section's Add shows
+only a choice of type with Next and Cancel, Next shows only that type's fields
+(no url field for `database` or `log`), Cancel at either step closes the form,
+and saving adds the target; a refused target comes back with its form open, the
+values entered and the reason, and after Cancel the next Add starts with an
+empty form and no reason; the Copy button beside an entrypoint URL reads
 "Copied" once clicked; an entrypoint's Edit button shows its edit form in place
 of its description and hides until the form closes, Cancel hides the form and
 drops what was typed, as does leaving the page and going back to it, and Save

internal/handlers/export_test.go

@@ -137,22 +137,20 @@ func (s *Handlers) RenderTemplateForTest(
 // BuildSlackTargetConfigForTest exposes
 // buildSlackTargetConfig for use in the handlers_test package.
 func (s *Handlers) BuildSlackTargetConfigForTest(
-	w http.ResponseWriter,
-	r *http.Request,
+	ctx context.Context,
 	targetURL string,
-) (string, error) {
-	return s.buildSlackTargetConfig(w, r, targetURL)
+) (string, string) {
+	return s.buildSlackTargetConfig(ctx, targetURL)
 }
 
 // BuildHTTPTargetConfigForTest exposes buildHTTPTargetConfig
 // for use in the handlers_test package, taking the form fields
 // an HTTP target's configuration is built from.
 func (s *Handlers) BuildHTTPTargetConfigForTest(
-	w http.ResponseWriter,
-	r *http.Request,
+	ctx context.Context,
 	targetURL, headers, timeout string,
-) (string, error) {
-	return s.buildHTTPTargetConfig(w, r, targetFormInput{
+) (string, string) {
+	return s.buildHTTPTargetConfig(ctx, targetFormInput{
 		URL:     targetURL,
 		Headers: headers,
 		Timeout: timeout,
@@ -162,9 +160,6 @@ func (s *Handlers) BuildHTTPTargetConfigForTest(
 // BuildDatabaseTargetConfigForTest exposes
 // buildDatabaseTargetConfig for use in the handlers_test
 // package.
-func (s *Handlers) BuildDatabaseTargetConfigForTest(
-	w http.ResponseWriter,
-	expiry string,
-) (string, error) {
-	return s.buildDatabaseTargetConfig(w, newRequestForTest(), expiry)
+func BuildDatabaseTargetConfigForTest(expiry string) (string, string) {
+	return buildDatabaseTargetConfig(expiry)
 }

internal/handlers/handlers_test.go

@@ -314,16 +314,11 @@ func TestBuildSlackTargetConfig_AcceptsPublicURL(t *testing.T) {
 
 	t.Cleanup(app.RequireStop)
 
-	req := httptest.NewRequestWithContext(
-		context.Background(), http.MethodPost, "/", nil)
-	w := httptest.NewRecorder()
-
-	cfg, err := h.BuildSlackTargetConfigForTest(
-		w, req, "http://93.184.216.34/services/T00/B00/xxx",
+	cfg, errMsg := h.BuildSlackTargetConfigForTest(
+		t.Context(), "http://93.184.216.34/services/T00/B00/xxx",
 	)
 
-	require.NoError(t, err)
-	assert.Equal(t, http.StatusOK, w.Code)
+	assert.Empty(t, errMsg)
 	assert.Contains(t, cfg, "webhookUrl")
 }
 
@@ -337,17 +332,12 @@ func TestBuildSlackTargetConfig_RejectsReservedURL(t *testing.T) {
 
 	t.Cleanup(app.RequireStop)
 
-	req := httptest.NewRequestWithContext(
-		context.Background(), http.MethodPost, "/", nil)
-	w := httptest.NewRecorder()
-
-	cfg, err := h.BuildSlackTargetConfigForTest(
-		w, req, "http://169.254.169.254/latest/meta-data/",
+	cfg, errMsg := h.BuildSlackTargetConfigForTest(
+		t.Context(), "http://169.254.169.254/latest/meta-data/",
 	)
 
-	require.Error(t, err)
+	assert.Contains(t, errMsg, "Invalid target URL")
 	assert.Empty(t, cfg)
-	assert.Equal(t, http.StatusBadRequest, w.Code)
 }
 
 func TestRenderTemplate(t *testing.T) {
@@ -444,29 +434,19 @@ func TestRenderTemplateMidRenderErrorSendsNoPartialBody(t *testing.T) {
 func TestBuildDatabaseTargetConfig_Valid(t *testing.T) {
 	t.Parallel()
 
-	var h *handlers.Handlers
-
-	app := newTestApp(t, &h)
-	app.RequireStart()
-
-	t.Cleanup(app.RequireStop)
-
 	// Empty expiry: the keep-forever default, empty config.
-	w := httptest.NewRecorder()
-	cfg, err := h.BuildDatabaseTargetConfigForTest(w, "")
-	require.NoError(t, err)
+	cfg, errMsg := handlers.BuildDatabaseTargetConfigForTest("")
+	assert.Empty(t, errMsg)
 	assert.Empty(t, cfg)
 
 	// Explicit never is stored as config.
-	w = httptest.NewRecorder()
-	cfg, err = h.BuildDatabaseTargetConfigForTest(w, "never")
-	require.NoError(t, err)
+	cfg, errMsg = handlers.BuildDatabaseTargetConfigForTest("never")
+	assert.Empty(t, errMsg)
 	assert.JSONEq(t, `{"expiry":"never"}`, cfg)
 
 	// A positive duration is stored as config.
-	w = httptest.NewRecorder()
-	cfg, err = h.BuildDatabaseTargetConfigForTest(w, "720h")
-	require.NoError(t, err)
+	cfg, errMsg = handlers.BuildDatabaseTargetConfigForTest("720h")
+	assert.Empty(t, errMsg)
 	assert.JSONEq(t, `{"expiry":"720h"}`, cfg)
 }
 
@@ -475,22 +455,13 @@ func TestBuildDatabaseTargetConfig_RejectsBadExpiry(
 ) {
 	t.Parallel()
 
-	var h *handlers.Handlers
-
-	app := newTestApp(t, &h)
-	app.RequireStart()
-
-	t.Cleanup(app.RequireStop)
-
 	for _, bad := range []string{"nonsense", "7d", "-5h"} {
-		w := httptest.NewRecorder()
-		cfg, err := h.BuildDatabaseTargetConfigForTest(w, bad)
+		cfg, errMsg := handlers.BuildDatabaseTargetConfigForTest(bad)
 
-		require.Error(t, err, "expiry %q", bad)
-		assert.Empty(t, cfg)
-		assert.Equal(
-			t, http.StatusBadRequest, w.Code,
-			"expiry %q should be rejected with 400", bad,
+		assert.Contains(
+			t, errMsg, "Invalid archive expiry",
+			"expiry %q should be refused", bad,
 		)
+		assert.Empty(t, cfg)
 	}
 }

internal/handlers/source_management.go

@@ -1,6 +1,7 @@
 package handlers
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -38,9 +39,6 @@ type WebhookListItem struct {
 	EventsUnreadable  bool
 }
 
-// errMissingURL signals that a required URL was not provided.
-var errMissingURL = errors.New("missing URL")
-
 // parseRetentionDays interprets a retention_days form value. It
 // returns the number of days, or, for a value it refuses, the message
 // the create and edit forms show; the message is empty when the value
@@ -460,15 +458,20 @@ func (h *Handlers) HandleSourceDetail() http.HandlerFunc {
 			return
 		}
 
-		h.renderSourceDetail(w, r, webhook)
+		h.renderSourceDetail(w, r, webhook, targetFormInput{}, "")
 	}
 }
 
-// renderSourceDetail loads and renders a source detail page.
+// renderSourceDetail loads and renders a source detail page. With a
+// targetErr, it is the page shown again for a refused add target
+// form: it answers 400, and the form opens on targetForm's type with
+// its values and the message.
 func (h *Handlers) renderSourceDetail(
 	w http.ResponseWriter,
 	r *http.Request,
 	webhook database.Webhook,
+	targetForm targetFormInput,
+	targetErr string,
 ) {
 	var entrypoints []database.Entrypoint
 
@@ -525,9 +528,16 @@ func (h *Handlers) renderSourceDetail(
 		"Events":      events,
 		"BaseURL":     baseURL,
 		"Stats":       h.loadWebhookStats(webhook.ID, entrypoints, targets),
+		"TargetForm":  targetForm,
+		"TargetError": targetErr,
 	}
 
-	h.renderTemplate(w, r, "source_detail.html", data)
+	status := http.StatusOK
+	if targetErr != "" {
+		status = http.StatusBadRequest
+	}
+
+	h.renderTemplateStatus(w, r, "source_detail.html", data, status)
 }
 
 // HandleSourceEdit shows the form to edit a webhook.
@@ -1501,67 +1511,24 @@ func (h *Handlers) HandleTargetCreate() http.HandlerFunc {
 	}
 }
 
-// processTargetCreate validates and creates a new target.
+// processTargetCreate validates and creates a new target. A refused
+// submission shows the webhook page again, with the add target form
+// open on the chosen type, the values entered, and the reason.
 func (h *Handlers) processTargetCreate(
 	w http.ResponseWriter,
 	r *http.Request,
 	webhook database.Webhook,
 ) {
-	// The body size cap is enforced by the MaxBodySize middleware,
-	// which runs before CSRF parses the form.
-	//
-	// Every field here is read with PostFormValue, not FormValue.
-	// FormValue falls back to the query string, which would let
-	// `POST /hook/{id}/targets?url=https://hooks.slack.com/...`
-	// configure a target from a value the request line carries — and
-	// the request line, unlike the body, is what logs, proxies,
-	// Referer headers and error trackers record.
-	name := r.PostFormValue("name")
-	targetType := database.TargetType(r.PostFormValue("type"))
+	in := targetFormInputFrom(r)
 
-	if name == "" {
-		http.Error(
-			w, "Name is required", http.StatusBadRequest,
-		)
+	target, errMsg := h.newTarget(r.Context(), webhook.ID, in)
+	if errMsg != "" {
+		h.renderSourceDetail(w, r, webhook, in, errMsg)
 
 		return
 	}
 
-	if !isValidTargetType(targetType) {
-		http.Error(
-			w, "Invalid target type",
-			http.StatusBadRequest,
-		)
-
-		return
-	}
-
-	configJSON, err := h.buildTargetConfig(
-		w, r, targetType, targetFormInputFrom(r),
-	)
-	if err != nil {
-		return
-	}
-
-	// A new target has no stored retry count, so an absent field
-	// takes the fire-and-forget default. A field the operator filled
-	// in with something invalid is rejected rather than becoming
-	// that default.
-	maxRetries, ok := targetMaxRetries(w, r, 0)
-	if !ok {
-		return
-	}
-
-	target := &database.Target{
-		WebhookID:  webhook.ID,
-		Name:       name,
-		Type:       targetType,
-		Active:     true,
-		Config:     configJSON,
-		MaxRetries: maxRetries,
-	}
-
-	err = h.db.DB().Create(target).Error
+	err := h.db.DB().Create(target).Error
 	if err != nil {
 		h.serverError(w, r, "failed to create target", err)
 
@@ -1574,6 +1541,47 @@ func (h *Handlers) processTargetCreate(
 	)
 }
 
+// newTarget validates a new target for a webhook and returns the row
+// to create, or, when it refuses the target, the message the form
+// shows. Every form that creates a target goes through here, so they
+// all accept and refuse the same things.
+func (h *Handlers) newTarget(
+	ctx context.Context,
+	webhookID string,
+	in targetFormInput,
+) (*database.Target, string) {
+	if in.Name == "" {
+		return nil, "Name is required"
+	}
+
+	if !isValidTargetType(in.Type) {
+		return nil, "Invalid target type"
+	}
+
+	configJSON, errMsg := h.buildTargetConfig(ctx, in.Type, in)
+	if errMsg != "" {
+		return nil, errMsg
+	}
+
+	// A new target has no stored retry count, so an absent field
+	// takes the fire-and-forget default. A field the operator filled
+	// in with something invalid is refused rather than becoming
+	// that default.
+	maxRetries, err := parseMaxRetries(in.MaxRetries, 0)
+	if err != nil {
+		return nil, "Invalid max retries: " + retriesErrorMessage(err)
+	}
+
+	return &database.Target{
+		WebhookID:  webhookID,
+		Name:       in.Name,
+		Type:       in.Type,
+		Active:     true,
+		Config:     configJSON,
+		MaxRetries: maxRetries,
+	}, ""
+}
+
 // isValidTargetType checks whether the target type is supported.
 func isValidTargetType(tt database.TargetType) bool {
 	switch tt {
@@ -1605,11 +1613,16 @@ func pageOrFirst(s string) int {
 	return v
 }
 
-// targetFormInput carries the raw form values describing a target's
-// configuration. Both the create and the edit path fill one and hand
-// it to buildTargetConfig, so neither can come to validate a
-// destination differently from the other.
+// targetFormInput carries the raw values of a target form. Both the
+// create and the edit path fill one and hand it to buildTargetConfig,
+// so neither can come to validate a destination differently from the
+// other. A refused add target form is shown again from it.
 type targetFormInput struct {
+	// Name is the target's name.
+	Name string
+	// Type is the type chosen on the add target form. The edit form
+	// has none: a target's stored type decides.
+	Type database.TargetType
 	// URL is the destination for an HTTP target and the webhook URL
 	// for a Slack target.
 	URL string
@@ -1618,13 +1631,15 @@ type targetFormInput struct {
 	Headers string
 	// Timeout is an HTTP target's per-request timeout in seconds.
 	Timeout string
+	// MaxRetries is an HTTP or Slack target's max_retries.
+	MaxRetries string
 	// Expiry is a database (archive) target's row expiry.
 	Expiry string
 }
 
-// targetFormInputFrom reads the configuration fields from a request
-// body. The body size cap is enforced by the MaxBodySize middleware,
-// which runs before CSRF parses the form.
+// targetFormInputFrom reads a target form from a request body. The
+// body size cap is enforced by the MaxBodySize middleware, which runs
+// before CSRF parses the form.
 //
 // Every field is read with PostFormValue, not FormValue. FormValue
 // falls back to the query string, which would let
@@ -1636,38 +1651,36 @@ type targetFormInput struct {
 // tokens.
 func targetFormInputFrom(r *http.Request) targetFormInput {
 	return targetFormInput{
-		URL:     r.PostFormValue("url"),
-		Headers: r.PostFormValue("headers"),
-		Timeout: r.PostFormValue("timeout"),
-		Expiry:  r.PostFormValue("expiry"),
+		Name:       r.PostFormValue("name"),
+		Type:       database.TargetType(r.PostFormValue("type")),
+		URL:        r.PostFormValue("url"),
+		Headers:    r.PostFormValue("headers"),
+		Timeout:    r.PostFormValue("timeout"),
+		MaxRetries: r.PostFormValue("max_retries"),
+		Expiry:     r.PostFormValue("expiry"),
 	}
 }
 
 // buildTargetConfig builds the JSON config string for a target from
-// the submitted form values, writing its own 4xx response on
-// rejection. Which fields of in apply depends on the target type.
+// the submitted form values, or returns the message the form shows
+// for a value it refuses. Which fields of in apply depends on the
+// target type; a type without a URL ignores any URL submitted.
 func (h *Handlers) buildTargetConfig(
-	w http.ResponseWriter,
-	r *http.Request,
+	ctx context.Context,
 	targetType database.TargetType,
 	in targetFormInput,
-) (string, error) {
+) (string, string) {
 	switch targetType {
 	case database.TargetTypeHTTP:
-		return h.buildHTTPTargetConfig(w, r, in)
+		return h.buildHTTPTargetConfig(ctx, in)
 	case database.TargetTypeSlack:
-		return h.buildSlackTargetConfig(w, r, in.URL)
+		return h.buildSlackTargetConfig(ctx, in.URL)
 	case database.TargetTypeDatabase:
-		return h.buildDatabaseTargetConfig(w, r, in.Expiry)
+		return buildDatabaseTargetConfig(in.Expiry)
 	case database.TargetTypeLog:
-		return "", nil
+		return "", ""
 	default:
-		http.Error(
-			w, "Invalid target type",
-			http.StatusBadRequest,
-		)
-
-		return "", errMissingURL
+		return "", "Invalid target type"
 	}
 }
 
@@ -1675,40 +1688,27 @@ func (h *Handlers) buildTargetConfig(
 // SSRF-validated destination plus the optional headers and timeout
 // the delivery path honours.
 func (h *Handlers) buildHTTPTargetConfig(
-	w http.ResponseWriter,
-	r *http.Request,
+	ctx context.Context,
 	in targetFormInput,
-) (string, error) {
-	err := h.validateTargetURL(
-		w, r, in.URL, "URL is required for HTTP targets",
+) (string, string) {
+	errMsg := h.validateTargetURL(
+		ctx, in.URL, "URL is required for HTTP targets",
 	)
-	if err != nil {
-		return "", err
+	if errMsg != "" {
+		return "", errMsg
 	}
 
 	headers, err := delivery.ParseTargetHeaders(in.Headers)
 	if err != nil {
-		http.Error(
-			w,
-			"Invalid headers: "+err.Error(),
-			http.StatusBadRequest,
-		)
-
-		return "", err
+		return "", "Invalid headers: " + err.Error()
 	}
 
 	timeout, err := delivery.ParseTargetTimeout(in.Timeout)
 	if err != nil {
-		http.Error(
-			w,
-			"Invalid timeout: "+err.Error(),
-			http.StatusBadRequest,
-		)
-
-		return "", err
+		return "", "Invalid timeout: " + err.Error()
 	}
 
-	return h.marshalTargetConfig(w, r, delivery.HTTPTargetConfig{
+	return marshalTargetConfig(delivery.HTTPTargetConfig{
 		URL:     in.URL,
 		Headers: headers,
 		Timeout: timeout,
@@ -1718,49 +1718,39 @@ func (h *Handlers) buildHTTPTargetConfig(
 // buildSlackTargetConfig builds config JSON for a Slack target,
 // whose whole configuration is one SSRF-validated webhook URL.
 func (h *Handlers) buildSlackTargetConfig(
-	w http.ResponseWriter,
-	r *http.Request,
+	ctx context.Context,
 	targetURL string,
-) (string, error) {
-	err := h.validateTargetURL(
-		w, r, targetURL,
+) (string, string) {
+	errMsg := h.validateTargetURL(
+		ctx, targetURL,
 		"Webhook URL is required for Slack targets",
 	)
-	if err != nil {
-		return "", err
+	if errMsg != "" {
+		return "", errMsg
 	}
 
-	return h.marshalTargetConfig(w, r, delivery.SlackTargetConfig{
+	return marshalTargetConfig(delivery.SlackTargetConfig{
 		WebhookURL: targetURL,
 	})
 }
 
-// validateTargetURL rejects an empty or SSRF-blocked destination,
-// writing the 400 itself. missingMsg is the error shown when no URL
-// is given.
+// validateTargetURL refuses an empty or SSRF-blocked destination,
+// returning the message the form shows, or "" when the destination
+// is accepted. missingMsg is the message for no URL at all.
 //
 // It is the single point at which a user-supplied destination enters
 // the SSRF guard, on create and on edit alike. An edit path that
 // reached storage without passing through here would reopen the hole
 // the guard closes.
 func (h *Handlers) validateTargetURL(
-	w http.ResponseWriter,
-	r *http.Request,
+	ctx context.Context,
 	targetURL, missingMsg string,
-) error {
+) string {
 	if targetURL == "" {
-		http.Error(
-			w,
-			missingMsg,
-			http.StatusBadRequest,
-		)
-
-		return errMissingURL
+		return missingMsg
 	}
 
-	err := h.ssrf.ValidateTargetURL(
-		r.Context(), targetURL,
-	)
+	err := h.ssrf.ValidateTargetURL(ctx, targetURL)
 	if err != nil {
 		// The submitted URL can be a credential (a Slack
 		// incoming webhook URL is a bearer token), so the log
@@ -1786,61 +1776,41 @@ func (h *Handlers) validateTargetURL(
 				"egress to your own network\" in the README)."
 		}
 
-		http.Error(w, msg, http.StatusBadRequest)
-
-		return err
+		return msg
 	}
 
-	return nil
+	return ""
 }
 
 // marshalTargetConfig serialises a target configuration for storage,
-// writing a 500 itself if it cannot.
-func (h *Handlers) marshalTargetConfig(
-	w http.ResponseWriter,
-	r *http.Request,
-	cfg any,
-) (string, error) {
+// or returns the message the form shows if it cannot.
+func marshalTargetConfig(cfg any) (string, string) {
 	configBytes, err := json.Marshal(cfg)
 	if err != nil {
-		h.serverError(w, r, "failed to encode target config", err)
-
-		return "", err
+		return "", "Could not encode the target configuration: " +
+			err.Error()
 	}
 
-	return string(configBytes), nil
+	return string(configBytes), ""
 }
 
 // buildDatabaseTargetConfig builds config JSON for a database
-// (archive) target. The optional expiry (a form value read by
-// the caller, which bounds the request body) is validated here,
-// at creation time, so an unparseable value is rejected with a
-// 400 instead of failing every subsequent delivery. An empty
-// expiry yields an empty config (the keep-forever default).
-func (h *Handlers) buildDatabaseTargetConfig(
-	w http.ResponseWriter,
-	r *http.Request,
-	expiry string,
-) (string, error) {
+// (archive) target. The optional expiry is validated here, at
+// creation time, so an unparseable value is refused instead of
+// failing every subsequent delivery. An empty expiry yields an
+// empty config (the keep-forever default).
+func buildDatabaseTargetConfig(expiry string) (string, string) {
 	expiry = strings.TrimSpace(expiry)
 	if expiry == "" {
-		return "", nil
+		return "", ""
 	}
 
 	err := delivery.ValidateArchiveExpiry(expiry)
 	if err != nil {
-		http.Error(
-			w,
-			"Invalid archive expiry: "+err.Error(),
-			http.StatusBadRequest,
-		)
-
-		return "", err
+		return "", "Invalid archive expiry: " + err.Error()
 	}
 
-	return h.marshalTargetConfig(
-		w, r, map[string]any{"expiry": expiry},
-	)
+	return marshalTargetConfig(map[string]any{"expiry": expiry})
 }
 
 // HandleEntrypointDelete handles deleting an entrypoint.

internal/handlers/target_create_test.go

@@ -0,0 +1,144 @@
+package handlers_test
+
+import (
+	"html"
+	"net/http"
+	"net/url"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"sneak.berlin/go/webhooker/internal/database"
+)
+
+// TestHandleTargetCreate_EveryType adds a target of each type. Each
+// submission carries a url: only the http and slack types store one.
+func TestHandleTargetCreate_EveryType(t *testing.T) {
+	t.Parallel()
+
+	env := setupSourceTest(t)
+
+	// fields is the rest of each submission, as a query string.
+	cases := []struct {
+		targetType  database.TargetType
+		fields      string
+		wantConfig  string
+		wantRetries int
+	}{
+		{
+			database.TargetTypeHTTP, "timeout=12&max_retries=3",
+			`{"url":"` + editOriginalURL + `","timeout":12}`, 3,
+		},
+		{
+			database.TargetTypeSlack, "max_retries=4",
+			`{"webhookUrl":"` + editOriginalURL + `"}`, 4,
+		},
+		{
+			database.TargetTypeDatabase, "expiry=720h",
+			`{"expiry":"720h"}`, 0,
+		},
+		{database.TargetTypeLog, "", "", 0},
+	}
+
+	for _, tc := range cases {
+		t.Run(string(tc.targetType), func(t *testing.T) {
+			t.Parallel()
+
+			webhook := seedWebhookWithRetention(t, env.db, 30)
+
+			form, err := url.ParseQuery(tc.fields)
+			require.NoError(t, err)
+			form.Set("name", "every-type")
+			form.Set("type", string(tc.targetType))
+			form.Set("url", editOriginalURL)
+
+			w := serveTarget(
+				env, http.MethodPost,
+				"/hook/"+webhook.ID+"/targets", form,
+			)
+			require.Equal(t, http.StatusSeeOther, w.Code, w.Body.String())
+
+			targets := targetsForWebhook(t, env.db, webhook.ID)
+			require.Len(t, targets, 1)
+			assert.Equal(t, tc.targetType, targets[0].Type)
+			assert.Equal(t, tc.wantRetries, targets[0].MaxRetries)
+
+			if tc.wantConfig == "" {
+				assert.Empty(t, targets[0].Config)
+			} else {
+				assert.JSONEq(t, tc.wantConfig, targets[0].Config)
+			}
+		})
+	}
+}
+
+// TestHandleTargetCreate_RefusedFormComesBack refuses a target of each
+// type and checks that the webhook page comes back with the add target
+// form open on that type, the values entered, and the reason.
+func TestHandleTargetCreate_RefusedFormComesBack(t *testing.T) {
+	t.Parallel()
+
+	env := setupSourceTest(t)
+
+	// fields is what the operator typed, as a query string.
+	cases := []struct {
+		targetType database.TargetType
+		fields     string
+		reason     string
+	}{
+		{
+			database.TargetTypeHTTP,
+			"name=private&url=" + editBlockedURL +
+				"&timeout=12&max_retries=3",
+			"Invalid target URL",
+		},
+		{
+			database.TargetTypeSlack, "name=no-url&max_retries=4",
+			"Webhook URL is required for Slack targets",
+		},
+		{
+			database.TargetTypeDatabase, "name=archive&expiry=7d",
+			"Invalid archive expiry",
+		},
+		{database.TargetTypeLog, "name=", "Name is required"},
+	}
+
+	for _, tc := range cases {
+		t.Run(string(tc.targetType), func(t *testing.T) {
+			t.Parallel()
+
+			webhook := seedWebhookWithRetention(t, env.db, 30)
+
+			typed, err := url.ParseQuery(tc.fields)
+			require.NoError(t, err)
+
+			form := url.Values{}
+			form.Set("type", string(tc.targetType))
+
+			for field := range typed {
+				form.Set(field, typed.Get(field))
+			}
+
+			w := serveTarget(
+				env, http.MethodPost,
+				"/hook/"+webhook.ID+"/targets", form,
+			)
+			assert.Equal(t, http.StatusBadRequest, w.Code)
+
+			page := w.Body.String()
+			assert.Contains(
+				t, page, `data-type="`+string(tc.targetType)+`"`,
+			)
+			assert.Contains(t, page, html.EscapeString(tc.reason))
+
+			for field := range typed {
+				assert.Contains(
+					t, page, `name="`+field+`" value="`+
+						html.EscapeString(typed.Get(field))+`"`,
+				)
+			}
+
+			assert.Empty(t, targetsForWebhook(t, env.db, webhook.ID))
+		})
+	}
+}

internal/handlers/target_edit.go

@@ -127,11 +127,12 @@ func (h *Handlers) applyTargetEdit(
 		return
 	}
 
-	configJSON, err := h.buildTargetConfig(
-		w, r, target.Type, targetFormInputFrom(r),
+	configJSON, errMsg := h.buildTargetConfig(
+		r.Context(), target.Type, targetFormInputFrom(r),
 	)
-	if err != nil {
-		// buildTargetConfig has already written the response.
+	if errMsg != "" {
+		http.Error(w, errMsg, http.StatusBadRequest)
+
 		return
 	}
 
@@ -161,7 +162,7 @@ func (h *Handlers) applyTargetEdit(
 	// A new name renames the archive file before it is saved (see
 	// delivery.Engine.Rename). If either step fails, it goes back to
 	// the name that is still stored.
-	err = h.renameTargetArchive(target, webhook.Name, oldName, name)
+	err := h.renameTargetArchive(target, webhook.Name, oldName, name)
 	if err == nil {
 		err = h.db.DB().Save(target).Error
 	}

internal/handlers/target_private_refusal_test.go

@@ -1,6 +1,7 @@
 package handlers_test
 
 import (
+	"html"
 	"net/http"
 	"net/url"
 	"testing"
@@ -43,12 +44,16 @@ func TestTargetRefusal_PrivateDestinationSaysHowToAllowIt(
 			form.Set("type", string(targetType))
 			form.Set("url", editBlockedURL)
 
+			// A refused add shows the webhook page again, where
+			// the hint is HTML-escaped; a refused edit answers in
+			// plain text.
 			added := serveTarget(
 				env, http.MethodPost, targetsPath, form,
 			)
 			assert.Equal(t, http.StatusBadRequest, added.Code)
 			assert.Contains(
-				t, added.Body.String(), privateRefusalHint,
+				t, added.Body.String(),
+				html.EscapeString(privateRefusalHint),
 			)
 
 			form.Set("url", editOriginalURL)

internal/handlers/target_retries.go

@@ -90,13 +90,14 @@ func retriesErrorMessage(err error) string {
 		", or 0 for fire-and-forget"
 }
 
-// targetMaxRetries reads and validates max_retries from a target form
+// targetMaxRetries reads and validates max_retries from a target edit
 // submission, answering the request with a 400 and reporting false
 // when the value is set but invalid.
 //
-// Both the create and the edit path go through here, so the two
-// cannot come to disagree about what a valid retry count is. The
-// wording matches the timeout control on the same submission.
+// It and the create path (newTarget) both use parseMaxRetries and
+// retriesErrorMessage, so the two cannot come to disagree about what a
+// valid retry count is. The wording matches the timeout control on
+// the same submission.
 func targetMaxRetries(
 	w http.ResponseWriter,
 	r *http.Request,

internal/server/alpine_browser_test.go

@@ -83,8 +83,37 @@ func TestAlpineRunsUnderTheSecurityPolicy(t *testing.T) {
 
 	page := srv.URL + "/hook/" + webhook.ID
 
-	checkAddForms(ctx, t, page)
-	checkTargetType(ctx, t, page+"/events")
+	checkAddEntrypoint(ctx, t, page)
+
+	// Each target type, with the fields its add target form submits, in
+	// page order. Only http and slack have a url field.
+	targetTypes := []struct {
+		name   string
+		fields string
+		values map[string]string
+	}{
+		{
+			"http", "csrf_token name type url headers timeout max_retries",
+			map[string]string{"url": publicTargetURL},
+		},
+		{
+			"slack", "csrf_token name type url max_retries",
+			map[string]string{"url": publicTargetURL},
+		},
+		{
+			"database", "csrf_token name type expiry",
+			map[string]string{"expiry": "720h"},
+		},
+		{"log", "csrf_token name type", nil},
+	}
+
+	for _, tt := range targetTypes {
+		checkAddTarget(
+			ctx, t, page, tt.name, strings.Fields(tt.fields), tt.values,
+		)
+	}
+
+	checkRefusedTarget(ctx, t, page)
 	checkCopy(ctx, t, page)
 	checkEntrypointEdit(ctx, t, page, page+"/events")
 	checkEventLog(ctx, t, page+"/events", event.ID, target.Name)
@@ -228,115 +257,176 @@ func click(ctx context.Context, t *testing.T, xpath string) {
 	))
 }
 
-// checkAddForms loads a webhook page and checks that each section's add
-// form stays hidden until the Add button beside its heading is clicked.
-// The click looks for a button element there, so it also checks that
-// Add is one.
-func checkAddForms(ctx context.Context, t *testing.T, url string) {
+// checkAddEntrypoint loads a webhook page and checks that the add
+// entrypoint form stays hidden until the Add button beside its heading
+// is clicked. The click looks for a button element there, so it also
+// checks that Add is one.
+func checkAddEntrypoint(ctx context.Context, t *testing.T, url string) {
+	t.Helper()
+
+	form := `form[action$="/entrypoints"]`
+
+	require.NoError(t, chromedp.Run(ctx, loadPage(url)))
+
+	assert.True(t, hidden(ctx, form),
+		"the add entrypoint form shows before Add is clicked")
+
+	click(ctx, t, `//h2[text()="Entrypoints"]/following-sibling::button`)
+
+	assert.True(t, shown(ctx, form),
+		"the add entrypoint form stays hidden when Add is clicked")
+}
+
+// publicTargetURL is a destination the server accepts for an http or
+// slack target. It is a literal public address, so accepting it needs
+// no DNS.
+const publicTargetURL = "https://93.184.216.34/hook"
+
+// The parts of the targets section's add target form the checks below
+// find and click. Add is the button beside the Targets heading; each
+// Cancel is found from the button beside it, since both are on the
+// page at once.
+const (
+	addTarget     = `//h2[text()="Targets"]/following-sibling::button`
+	typeSelect    = `//select[@aria-label="Target type"]`
+	nextButton    = `//button[text()="Next"]`
+	cancelChoice  = nextButton + `/following-sibling::button[text()="Cancel"]`
+	saveButton    = `//form[contains(@action, "/targets")]//button[text()="Save"]`
+	cancelFields  = saveButton + `/following-sibling::button[text()="Cancel"]`
+	targetName    = `form[action$="/targets"] input[name="name"]`
+	submittedKeys = `[...new FormData(
+		document.querySelector('form[action$="/targets"]')).keys()]`
+)
+
+// checkAddTarget loads a webhook page and walks the add target form for
+// one target type. The form shows nothing until Add is clicked; Add
+// shows only the type choice; Cancel there closes it; Next shows the
+// type's own fields in place of the choice, and the form then submits
+// exactly fields, so a field another type uses, such as url, is absent;
+// Cancel closes it again. It then adds a target of the type, filling in
+// values, and checks that the section lists it with that type.
+func checkAddTarget(
+	ctx context.Context,
+	t *testing.T,
+	url, targetType string,
+	fields []string,
+	values map[string]string,
+) {
 	t.Helper()
 
 	require.NoError(t, chromedp.Run(ctx, loadPage(url)))
 
-	sections := []struct{ heading, form string }{
-		{"Entrypoints", `form[action$="/entrypoints"]`},
-		{"Targets", `form[action$="/targets"]`},
+	assert.Truef(t, hidden(ctx, typeSelect),
+		"%s: the type choice shows before Add is clicked", targetType)
+	assert.Truef(t, hidden(ctx, targetName),
+		"%s: the fields show before Add is clicked", targetType)
+
+	click(ctx, t, addTarget)
+	assert.Truef(t, shown(ctx, typeSelect),
+		"%s: Add does not show the type choice", targetType)
+	assert.Truef(t, hidden(ctx, targetName),
+		"%s: Add shows the fields before Next", targetType)
+
+	click(ctx, t, cancelChoice)
+	assert.Truef(t, hidden(ctx, typeSelect),
+		"%s: Cancel does not close the type choice", targetType)
+
+	chooseTargetType(ctx, t, targetType)
+
+	var submitted []string
+
+	require.NoError(t, chromedp.Run(
+		ctx, chromedp.Evaluate(submittedKeys, &submitted),
+	))
+	assert.Equalf(t, fields, submitted,
+		"%s: the form does not submit exactly the type's fields", targetType)
+
+	click(ctx, t, cancelFields)
+	assert.Truef(t, hidden(ctx, targetName),
+		"%s: Cancel does not close the fields", targetType)
+	assert.Truef(t, shown(ctx, addTarget),
+		"%s: Add does not come back after Cancel", targetType)
+
+	name := "added-" + targetType
+
+	chooseTargetType(ctx, t, targetType)
+	require.NoError(t, chromedp.Run(
+		ctx, chromedp.SetValue(targetName, name, chromedp.ByQuery),
+	))
+
+	for field, value := range values {
+		require.NoError(t, chromedp.Run(ctx, chromedp.SetValue(
+			`form[action$="/targets"] [name="`+field+`"]`, value,
+			chromedp.ByQuery,
+		)))
 	}
 
-	for _, s := range sections {
-		assert.Truef(
-			t, hidden(ctx, s.form),
-			"%s: the add form shows before Add is clicked", s.heading,
-		)
-
-		click(ctx, t, `//h2[text()="`+s.heading+
-			`"]/following-sibling::button`)
-
-		assert.Truef(
-			t, shown(ctx, s.form),
-			"%s: the add form stays hidden when Add is clicked", s.heading,
-		)
-	}
+	click(ctx, t, saveButton)
+	assert.Truef(t, shown(ctx, `//span[text()="`+name+
+		`"]/following-sibling::div/span[text()="`+targetType+`"]`),
+		"%s: the added target is not listed with its type", targetType)
 }
 
-// checkTargetType chooses Slack in the open add target form and checks
-// what the form would then submit: one url field, the Slack one, and
-// not the HTTP url, headers or timeout, which are hidden and disabled.
-//
-// It then opens the page at elsewhere and goes back. The browser loads
-// the webhook page again and restores the form as it was left, Slack
-// chosen, without a change event; the form must again show and submit
-// Slack's fields, not the HTTP ones.
-func checkTargetType(ctx context.Context, t *testing.T, elsewhere string) {
+// chooseTargetType clicks Add, picks targetType and clicks Next, and
+// checks that the type's fields then show in place of the type choice.
+func chooseTargetType(ctx context.Context, t *testing.T, targetType string) {
+	t.Helper()
+
+	click(ctx, t, addTarget)
+	require.NoError(t, chromedp.Run(
+		ctx, chromedp.SetValue(typeSelect, targetType, chromedp.BySearch),
+	))
+	click(ctx, t, nextButton)
+
+	assert.Truef(t, shown(ctx, targetName),
+		"%s: Next does not show the fields", targetType)
+	assert.Truef(t, hidden(ctx, typeSelect),
+		"%s: Next leaves the type choice showing", targetType)
+	assert.Truef(t, hidden(ctx, addTarget),
+		"%s: Add still shows while the form is open", targetType)
+}
+
+// checkRefusedTarget submits an http target the server refuses, a
+// loopback destination, and checks that the page comes back with the
+// form open on the http fields, the values entered and the reason.
+func checkRefusedTarget(ctx context.Context, t *testing.T, url string) {
 	t.Helper()
 
 	const (
-		chooseSlack = `(() => {
-			const type = document.querySelector('select[name="type"]');
-			type.value = "slack";
-			type.dispatchEvent(new Event("change"));
-		})()`
-		chosen    = `document.querySelector('select[name="type"]').value`
-		howLoaded = `performance.getEntriesByType("navigation")[0].type`
-		submitted = `[...new FormData(
-			document.querySelector('form[action$="/targets"]')).keys()]`
-		slackURL = `input[placeholder^="https://hooks.slack.com/"]`
-		httpURL  = `input[placeholder="https://example.com/webhook"]`
+		refusedURL = "http://127.0.0.1/hook"
+		urlField   = `form[action$="/targets"] input[name="url"]`
 	)
 
-	slackFields := strings.Fields("csrf_token name type max_retries url")
+	require.NoError(t, chromedp.Run(ctx, loadPage(url)))
 
-	var fields []string
+	chooseTargetType(ctx, t, "http")
+	require.NoError(t, chromedp.Run(
+		ctx,
+		chromedp.SetValue(targetName, "refused", chromedp.ByQuery),
+		chromedp.SetValue(urlField, refusedURL, chromedp.ByQuery),
+	))
+
+	click(ctx, t, saveButton)
+
+	assert.True(t, shown(ctx, `//div[@class="alert-error"]`),
+		"a refused target does not show the reason")
+
+	var name, typed string
 
 	require.NoError(t, chromedp.Run(
 		ctx,
-		chromedp.Evaluate(chooseSlack, nil),
-		chromedp.Evaluate(submitted, &fields),
+		chromedp.Value(targetName, &name, chromedp.ByQuery),
+		chromedp.Value(urlField, &typed, chromedp.ByQuery),
 	))
 
-	assert.Equal(
-		t, slackFields, fields,
-		"with Slack chosen, the HTTP fields must not be submitted",
-	)
-
-	var loaded, restored string
-
-	// Going back waits for the load event, after which the browser has
-	// restored the form.
-	require.NoError(t, chromedp.Run(
-		ctx,
-		loadPage(elsewhere),
-		chromedp.NavigateBack(),
-		chromedp.WaitNotPresent("[x-cloak]", chromedp.ByQuery),
-		chromedp.Evaluate(howLoaded, &loaded),
-		chromedp.Evaluate(chosen, &restored),
-	))
-
-	// A page the browser kept in memory and showed again as it was
-	// would prove nothing here.
-	require.Equal(
-		t, "back_forward", loaded,
-		"going back, the browser did not load the page again",
-	)
-	require.Equal(
-		t, "slack", restored,
-		"going back, the browser did not restore the chosen type",
-	)
-
-	click(ctx, t, `//h2[text()="Targets"]/following-sibling::button`)
-
-	assert.True(t, shown(ctx, slackURL),
-		"going back with Slack chosen, the Slack fields are not shown")
-	assert.True(t, hidden(ctx, httpURL),
-		"going back with Slack chosen, the HTTP fields are shown")
-
-	require.NoError(t, chromedp.Run(
-		ctx, chromedp.Evaluate(submitted, &fields),
-	))
-
-	assert.Equal(
-		t, slackFields, fields,
-		"going back with Slack chosen, the HTTP fields must not be submitted",
-	)
+	assert.Equal(t, "refused", name,
+		"a refused target does not keep the name entered")
+	assert.Equal(t, refusedURL, typed,
+		"a refused target does not keep the url entered")
+	assert.True(t, shown(ctx, targetName),
+		"a refused target does not come back with the form open")
+	assert.True(t, hidden(ctx, typeSelect),
+		"a refused target comes back on the type choice")
 }
 
 // checkCopy loads a webhook page and checks that the Copy control beside

static/js/app.js

@@ -88,24 +88,35 @@ document.addEventListener("alpine:init", function () {
         };
     });
 
-    // The add target form. Only the chosen type's fields show, and the
-    // others are disabled so that the form does not submit them.
+    // The targets section's add target form, in three steps: closed,
+    // choosing a type, then filling in that type's fields. targetType
+    // is empty until Next takes it from the type select.
     //
-    // The type is read from the type select when Alpine starts, when the
-    // select changes, and on pageshow. Going back to the page, the
-    // browser restores the type chosen before without a change event,
-    // in some browsers only after Alpine has started, but always before
-    // pageshow.
+    // A refused submission comes back with the type it was submitted
+    // with in the section's data-type, and starts on that type's fields.
     window.Alpine.data("targetForm", function () {
         return {
+            choosing: false,
             targetType: "",
             init() {
-                this.readType();
+                this.targetType = this.$root.dataset.type;
             },
-            readType() {
-                this.targetType = this.$root.querySelector(
-                    'select[name="type"]'
-                ).value;
+            add() {
+                this.choosing = true;
+            },
+            next() {
+                this.targetType = this.$refs.type.value;
+                this.choosing = false;
+            },
+            cancel() {
+                this.choosing = false;
+                this.targetType = "";
+            },
+            get filling() {
+                return this.targetType !== "";
+            },
+            get closed() {
+                return !this.choosing && !this.filling;
             },
             get isHttp() {
                 return this.targetType === "http";
@@ -116,14 +127,8 @@ document.addEventListener("alpine:init", function () {
             get isDatabase() {
                 return this.targetType === "database";
             },
-            get notHttp() {
-                return !this.isHttp;
-            },
-            get notSlack() {
-                return !this.isSlack;
-            },
-            get notDatabase() {
-                return !this.isDatabase;
+            get isLog() {
+                return this.targetType === "log";
             },
         };
     });

templates/source_detail.html

@@ -105,10 +105,10 @@
         </div>
 
         <!-- Targets -->
-        <div class="card" x-data="collapsible">
+        <div class="card" x-data="targetForm" data-type="{{.TargetForm.Type}}">
             <div class="p-4 border-b border-gray-200 flex justify-between items-center">
                 <h2 class="text-lg font-medium text-gray-900">Targets</h2>
-                <button type="button" @click="toggle" class="btn-small">
+                <button type="button" @click="add" x-show="closed" class="btn-small">
                     <svg class="w-3 h-3 mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                         <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v16m8-8H4"/>
                     </svg>
@@ -116,48 +116,84 @@
                 </button>
             </div>
 
-            <!-- Add target form -->
-            <div x-show="open" x-cloak class="p-4 bg-gray-50 border-b border-gray-200">
-                <form method="POST" action="/hook/{{.Webhook.ID}}/targets" x-data="targetForm" @pageshow.window="readType" class="space-y-3">
-                    <input type="hidden" name="csrf_token" value="{{.CSRFToken}}">
-                    <div class="flex gap-2">
-                        <input type="text" name="name" placeholder="Target name" required class="input text-sm flex-1">
-                        <select name="type" @change="readType" class="input text-sm w-32">
-                            <option value="http">HTTP</option>
-                            <option value="slack">Slack</option>
-                            <option value="database">Database</option>
-                            <option value="log">Log</option>
-                        </select>
-                    </div>
-                    <div x-show="isHttp">
-                        <input type="url" name="url" placeholder="https://example.com/webhook" :disabled="notHttp" class="input text-sm">
-                    </div>
-                    <div x-show="isHttp">
-                        <textarea name="headers" rows="3" placeholder="Authorization: Bearer ..." :disabled="notHttp" class="input text-sm"></textarea>
-                        <p class="text-xs text-gray-500 mt-1">Optional request headers, one <code>Name: value</code> per line, sent with every delivery.</p>
-                    </div>
-                    <div x-show="isHttp" class="flex gap-2 items-center">
-                        <label class="text-sm text-gray-700">Timeout (seconds, blank = default):</label>
-                        <input type="number" name="timeout" min="0" max="300" :disabled="notHttp" class="input text-sm w-24">
-                    </div>
-                    <div x-show="isHttp">
-                        <div class="flex gap-2 items-center">
-                            <label class="text-sm text-gray-700">Max retries:</label>
-                            <input type="number" name="max_retries" value="0" min="0" max="20" class="input text-sm w-24">
+            <!-- Add target form. Add shows the type choice; Next replaces
+                 it with the chosen type's fields. Each type's fields,
+                 and the hidden type field submitted with them, exist
+                 only while that type is chosen. A refused submission
+                 comes back open on its type, with the values entered. -->
+            <form method="POST" action="/hook/{{.Webhook.ID}}/targets">
+                <input type="hidden" name="csrf_token" value="{{.CSRFToken}}">
+                <div x-show="choosing" x-cloak class="p-4 bg-gray-50 border-b border-gray-200 flex flex-wrap gap-2">
+                    <select x-ref="type" aria-label="Target type" class="input text-sm w-40">
+                        <option value="http">HTTP</option>
+                        <option value="slack">Slack</option>
+                        <option value="database">Database</option>
+                        <option value="log">Log</option>
+                    </select>
+                    <button type="button" @click="next" class="btn-primary text-sm">Next</button>
+                    <button type="button" @click="cancel" class="btn-secondary text-sm">Cancel</button>
+                </div>
+                <div x-show="filling" x-cloak class="p-4 bg-gray-50 border-b border-gray-200 space-y-3">
+                    {{if .TargetError}}
+                    <div class="alert-error">{{.TargetError}}</div>
+                    {{end}}
+                    <input type="text" name="name" value="{{.TargetForm.Name}}" placeholder="Target name" required class="input text-sm">
+                    <template x-if="isHttp">
+                        <div class="space-y-3">
+                            <input type="hidden" name="type" value="http">
+                            <input type="url" name="url" value="{{.TargetForm.URL}}" placeholder="https://example.com/webhook" class="input text-sm">
+                            <div>
+                                <textarea name="headers" rows="3" placeholder="Authorization: Bearer ..." class="input text-sm">{{.TargetForm.Headers}}</textarea>
+                                <p class="text-xs text-gray-500 mt-1">Optional request headers, one <code>Name: value</code> per line, sent with every delivery.</p>
+                            </div>
+                            <div class="flex gap-2 items-center">
+                                <label class="text-sm text-gray-700">Timeout (seconds, blank = default):</label>
+                                <input type="number" name="timeout" value="{{.TargetForm.Timeout}}" min="0" max="300" class="input text-sm w-24">
+                            </div>
+                            <div>
+                                <div class="flex gap-2 items-center">
+                                    <label class="text-sm text-gray-700">Max retries:</label>
+                                    <input type="number" name="max_retries" value="{{.TargetForm.MaxRetries}}" placeholder="0" min="0" max="20" class="input text-sm w-24">
+                                </div>
+                                <p class="text-xs text-gray-500 mt-1">This is the total number of delivery attempts, not retries on top of the first: a value of 3 makes three attempts in all. 0 means a single attempt with no retries and no circuit breaker.</p>
+                            </div>
                         </div>
-                        <p class="text-xs text-gray-500 mt-1">This is the total number of delivery attempts, not retries on top of the first: a value of 3 makes three attempts in all. 0 means a single attempt with no retries and no circuit breaker.</p>
+                    </template>
+                    <template x-if="isSlack">
+                        <div class="space-y-3">
+                            <input type="hidden" name="type" value="slack">
+                            <div>
+                                <input type="url" name="url" value="{{.TargetForm.URL}}" placeholder="https://hooks.slack.com/services/..." class="input text-sm">
+                                <p class="text-xs text-gray-500 mt-1">Slack or Mattermost incoming webhook URL. Payloads are pretty-printed in code blocks.</p>
+                            </div>
+                            <div>
+                                <div class="flex gap-2 items-center">
+                                    <label class="text-sm text-gray-700">Max retries:</label>
+                                    <input type="number" name="max_retries" value="{{.TargetForm.MaxRetries}}" placeholder="0" min="0" max="20" class="input text-sm w-24">
+                                </div>
+                                <p class="text-xs text-gray-500 mt-1">This is the total number of delivery attempts, not retries on top of the first: a value of 3 makes three attempts in all. 0 means a single attempt with no retries and no circuit breaker.</p>
+                            </div>
+                        </div>
+                    </template>
+                    <template x-if="isDatabase">
+                        <div>
+                            <input type="hidden" name="type" value="database">
+                            <input type="text" name="expiry" value="{{.TargetForm.Expiry}}" placeholder="never" class="input text-sm">
+                            <p class="text-xs text-gray-500 mt-1">Archive expiry: "never" (default) keeps rows forever, or a duration like "720h" prunes older rows.</p>
+                        </div>
+                    </template>
+                    <template x-if="isLog">
+                        <div>
+                            <input type="hidden" name="type" value="log">
+                            <p class="text-xs text-gray-500">A log target writes each event to the application log. It has no settings beyond its name.</p>
+                        </div>
+                    </template>
+                    <div class="flex gap-2">
+                        <button type="submit" class="btn-primary text-sm">Save</button>
+                        <button type="button" @click="cancel" class="btn-secondary text-sm">Cancel</button>
                     </div>
-                    <div x-show="isSlack">
-                        <input type="url" name="url" placeholder="https://hooks.slack.com/services/..." :disabled="notSlack" class="input text-sm">
-                        <p class="text-xs text-gray-500 mt-1">Slack or Mattermost incoming webhook URL. Payloads are pretty-printed in code blocks.</p>
-                    </div>
-                    <div x-show="isDatabase">
-                        <input type="text" name="expiry" placeholder="never" :disabled="notDatabase" class="input text-sm">
-                        <p class="text-xs text-gray-500 mt-1">Archive expiry: "never" (default) keeps rows forever, or a duration like "720h" prunes older rows.</p>
-                    </div>
-                    <button type="submit" class="btn-primary text-sm">Add Target</button>
-                </form>
-            </div>
+                </div>
+            </form>
 
             <div class="divide-y divide-gray-100">
                 {{range .Targets}}