Add post image upload interface (#12)

Adds accessible drag-and-drop and browse controls, staged attachment editing, responsive lazy-loaded thread image grids, and UI regression coverage.

Reviewed-on: #12
Co-authored-by: codegirl-007 <s.raide@gmail.com>

internal/web/posts_test.go

@@ -413,6 +413,12 @@ func TestQuestionPageRendersNestedPostControls(t *testing.T) {
 		Body:     "Water under the cabinet.",
 		City:     "Oakland",
 		PostDate: pacific.Today(),
+		Images: []store.PostImage{{
+			ID: "root-photo", ObjectKey: "post-images/root-photo.jpg",
+			PublicURL:   "https://cdn.example/root-photo.jpg",
+			Description: "Water pooling below the shutoff valve",
+			Width:       1200, Height: 900,
+		}},
 	}
 	if err := mem.CreatePost(context.Background(), root); err != nil {
 		t.Fatal(err)
@@ -421,6 +427,11 @@ func TestQuestionPageRendersNestedPostControls(t *testing.T) {
 		ParentID: &root.ID,
 		AuthorID: homeowner.ID,
 		Body:     "The model number is 123.",
+		Images: []store.PostImage{{
+			ID: "reply-photo", ObjectKey: "post-images/reply-photo.png",
+			PublicURL: "https://cdn.example/reply-photo.png",
+			Width:     900, Height: 1200,
+		}},
 	}
 	if err := mem.CreatePost(context.Background(), homeownerReply); err != nil {
 		t.Fatal(err)
@@ -429,6 +440,12 @@ func TestQuestionPageRendersNestedPostControls(t *testing.T) {
 		ParentID: &homeownerReply.ID,
 		AuthorID: admin.ID,
 		Body:     "Replace the cartridge.",
+		Images: []store.PostImage{{
+			ID: "admin-photo", ObjectKey: "post-images/admin-photo.webp",
+			PublicURL:   "https://cdn.example/admin-photo.webp",
+			Description: "Replacement cartridge orientation",
+			Width:       1000, Height: 1000,
+		}},
 	}
 	if err := mem.CreatePost(context.Background(), adminReply); err != nil {
 		t.Fatal(err)
@@ -460,6 +477,19 @@ func TestQuestionPageRendersNestedPostControls(t *testing.T) {
 		`action="/posts"`,
 		`data-submit-once`,
 		`data-submit-button`,
+		`enctype="multipart/form-data"`,
+		`data-image-picker`,
+		`accept="image/jpeg,image/png,image/webp"`,
+		`aria-live="polite"`,
+		`name="existing_image_id" value="root-photo"`,
+		`name="existing_image_id" value="reply-photo"`,
+		`src="https://cdn.example/root-photo.jpg"`,
+		`alt="Water pooling below the shutoff valve"`,
+		`src="https://cdn.example/reply-photo.png"`,
+		`alt="Photo attached to this post"`,
+		`src="https://cdn.example/admin-photo.webp"`,
+		`loading="lazy" decoding="async"`,
+		`<figcaption>Replacement cartridge orientation</figcaption>`,
 		`action="/posts/` + root.ID + `/edit"`,
 		`action="/posts/` + homeownerReply.ID + `/edit"`,
 		`href="/questions/` + root.ID + `#post-` + root.ID + `"`,
@@ -475,6 +505,9 @@ func TestQuestionPageRendersNestedPostControls(t *testing.T) {
 	if got := strings.Count(body, ">Permalink</a>"); got != 3 {
 		t.Fatalf("question page rendered %d permalinks, want 3: %s", got, body)
 	}
+	if got := strings.Count(body, `data-image-picker`); got != 5 {
+		t.Fatalf("question page rendered %d image pickers, want 5: %s", got, body)
+	}
 	if strings.Contains(body, `action="/posts/`+adminReply.ID+`/edit"`) {
 		t.Fatalf("homeowner can edit admin reply: %s", body)
 	}
@@ -490,6 +523,63 @@ func TestQuestionPageRendersNestedPostControls(t *testing.T) {
 		strings.Contains(rec.Body.String(), `action="/posts/`+root.ID+`/edit"`) {
 		t.Fatalf("admin edit controls are incorrect: %d %s", rec.Code, rec.Body.String())
 	}
+
+	rec = httptest.NewRecorder()
+	req = httptest.NewRequest(http.MethodGet, "/", nil)
+	for _, cookie := range homeownerCookies {
+		req.AddCookie(cookie)
+	}
+	handler.ServeHTTP(rec, req)
+	if rec.Code != http.StatusOK {
+		t.Fatalf("hunt page status = %d: %s", rec.Code, rec.Body.String())
+	}
+	if strings.Contains(rec.Body.String(), "cdn.example") {
+		t.Fatalf("hunt page rendered post images: %s", rec.Body.String())
+	}
+}
+
+func TestImagePickerAssetsAreServed(t *testing.T) {
+	t.Parallel()
+
+	srv, _ := newTestServer(t, Config{})
+	handler := srv.Handler()
+	for _, asset := range []struct {
+		path  string
+		wants []string
+	}{
+		{
+			path: "/static/app.js",
+			wants: []string{
+				`const pickerSelector = "[data-image-picker]"`,
+				`new DataTransfer()`,
+				`addEventListener("drop"`,
+				`resetImagePicker`,
+				`URL.revokeObjectURL`,
+			},
+		},
+		{
+			path: "/static/app.css",
+			wants: []string{
+				`.image-dropzone`,
+				`.image-dropzone:focus-within`,
+				`.image-preview-list`,
+				`.post-image-grid`,
+				`@media (max-width: 520px)`,
+			},
+		},
+	} {
+		rec := httptest.NewRecorder()
+		req := httptest.NewRequest(http.MethodGet, asset.path, nil)
+		handler.ServeHTTP(rec, req)
+		if rec.Code != http.StatusOK {
+			t.Fatalf("%s status = %d", asset.path, rec.Code)
+		}
+		for _, want := range asset.wants {
+			if !strings.Contains(rec.Body.String(), want) {
+				t.Errorf("%s missing %q", asset.path, want)
+			}
+		}
+	}
 }
 
 func waitForMail(t *testing.T, recording *mail.Recording, want int) []mail.PostReply {