feat(marketplace): add rich text description with sanitization

apps/web/src/components/marketplace/product-detail-view/ProductDetailViewDescription.tsx

@@ -1,7 +1,9 @@
 /**
  * ProductDetailView — description card.
+ * v0.401 M1.11: Rich text description with sanitization
  */
 import { Card } from '@/components/ui/card';
+import { sanitizeProductDescription } from '@/utils/sanitize';
 import type { Product } from '@/types';
 
 interface ProductDetailViewDescriptionProps {
@@ -9,13 +11,19 @@ interface ProductDetailViewDescriptionProps {
 }
 
 export function ProductDetailViewDescription({ product }: ProductDetailViewDescriptionProps) {
+  const safeDescription = sanitizeProductDescription(product.description ?? '');
+
   return (
     <Card variant="default">
       <h3 className="font-bold text-foreground text-xl mb-4 border-b border-border pb-2 tracking-tight">
         Description
       </h3>
       <div className="prose prose-invert max-w-none text-foreground">
-        <p>{product.description}</p>
+        {safeDescription ? (
+          <div dangerouslySetInnerHTML={{ __html: safeDescription }} />
+        ) : (
+          <p>{product.description || 'No description.'}</p>
+        )}
         {product.features?.length ? (
           <ul>
             {product.features.map((f: string, i: number) => (

apps/web/src/components/seller/create-product-view/CreateProductViewDetailsCard.tsx

@@ -1,6 +1,8 @@
+import { useRef } from 'react';
 import { Card } from '@/components/ui/card';
 import { Input } from '@/components/ui/input';
-import { Tag } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { Tag, Bold, List } from 'lucide-react';
 
 interface CreateProductViewDetailsCardProps {
   title: string;
@@ -31,6 +33,26 @@ export function CreateProductViewDetailsCard({
   keyVal,
   setKey,
 }: CreateProductViewDetailsCardProps) {
+  const descriptionRef = useRef<HTMLTextAreaElement>(null);
+
+  const insertAtCursor = (before: string, after: string) => {
+    const ta = descriptionRef.current;
+    if (!ta) return;
+    const start = ta.selectionStart;
+    const end = ta.selectionEnd;
+    const text = description;
+    const selected = text.slice(start, end) || 'text';
+    const newText = text.slice(0, start) + before + selected + after + text.slice(end);
+    setDescription(newText);
+    setTimeout(() => {
+      ta.focus();
+      ta.setSelectionRange(start + before.length, start + before.length + selected.length);
+    }, 0);
+  };
+
+  const handleBold = () => insertAtCursor('<b>', '</b>');
+  const handleList = () => insertAtCursor('\n<ul>\n<li>', '</li>\n</ul>\n');
+
   return (
     <Card variant="default">
       <h3 className="font-bold text-foreground mb-6 border-b border-border pb-2 tracking-tight">
@@ -47,9 +69,19 @@ export function CreateProductViewDetailsCard({
           <label className="block text-sm font-medium text-muted-foreground mb-2">
             Description
           </label>
+          <div className="flex gap-2 mb-2">
+            <Button type="button" variant="outline" size="sm" onClick={handleBold} className="h-8 px-3" aria-label="Bold">
+              <Bold className="w-4 h-4" />
+            </Button>
+            <Button type="button" variant="outline" size="sm" onClick={handleList} className="h-8 px-3" aria-label="Insert list">
+              <List className="w-4 h-4" />
+            </Button>
+            <span className="text-xs text-muted-foreground self-center">Basic HTML: &lt;b&gt;, &lt;ul&gt;&lt;li&gt;</span>
+          </div>
           <textarea
+            ref={descriptionRef}
             className="w-full bg-muted border border-border rounded-xl p-4 text-foreground focus:border-primary outline-none focus-visible:ring-2 focus-visible:ring-ring min-h-24 transition-colors duration-[var(--sumi-duration-normal)]"
-            placeholder="Describe your sound pack..."
+            placeholder="Describe your sound pack... Use Bold and List for formatting."
             value={description}
             onChange={(e) => setDescription(e.target.value)}
           />

apps/web/src/utils/sanitize.ts

@@ -322,6 +322,34 @@ export function sanitizeChatMessage(message: string): string {
   return sanitizeHTML(message, chatOptions);
 }
 
+/**
+ * Sanitise la description produit (rich text) pour affichage sécurisé
+ * v0.401 M1.11: Bold, listes (ul, ol, li), paragraphes
+ */
+export function sanitizeProductDescription(html: string): string {
+  if (!html?.trim()) return '';
+  if (typeof window !== 'undefined' && DOMPurify.isSupported) {
+    return DOMPurify.sanitize(html, {
+      ALLOWED_TAGS: ['p', 'br', 'strong', 'em', 'u', 'i', 'b', 'ul', 'ol', 'li', 'span', 'a'],
+      ALLOWED_ATTR: ['class', 'href', 'title', 'target'],
+      ALLOWED_URI_REGEXP: /^(?:(?:(?:f|ht)tps?|mailto):|[^a-z]|[a-z+.-]+(?:[^a-z+.\-:]|$))/i,
+      KEEP_CONTENT: true,
+      RETURN_DOM: false,
+      RETURN_DOM_FRAGMENT: false,
+      FORBID_TAGS: ['script', 'iframe', 'object', 'embed', 'form', 'input', 'button'],
+      FORBID_ATTR: ['onerror', 'onload', 'onclick', 'onmouseover', 'onfocus', 'onblur'],
+    });
+  }
+  const opts: SanitizeOptions = {
+    allowedTags: ['p', 'br', 'strong', 'em', 'u', 'i', 'b', 'ul', 'ol', 'li', 'span', 'a'],
+    allowedAttributes: { a: ['href', 'title', 'target'], span: ['class'] },
+    allowedSchemes: ['http', 'https', 'mailto'],
+    stripUnknownTags: true,
+    stripEmptyTags: true,
+  };
+  return sanitizeHTML(html, opts);
+}
+
 /**
  * Sanitise les noms d'utilisateur et autres champs texte
  */

veza-backend-api/internal/handlers/marketplace.go

@@ -8,6 +8,7 @@ import (
 
 	"veza-backend-api/internal/core/marketplace"
 	"veza-backend-api/internal/response"
+	"veza-backend-api/internal/utils"
 
 	"github.com/gin-gonic/gin"
 	"github.com/google/uuid"
@@ -78,7 +79,7 @@ func (h *MarketplaceHandler) CreateProduct(c *gin.Context) {
 	product := &marketplace.Product{
 		SellerID:    userID,
 		Title:       req.Title,
-		Description: req.Description,
+		Description: utils.SanitizeHTML(req.Description, 5000),
 		Price:       req.Price,
 		ProductType: req.ProductType,
 		LicenseType: marketplace.LicenseType(req.LicenseType),
@@ -268,6 +269,49 @@ func (h *MarketplaceHandler) UploadProductPreview(c *gin.Context) {
 	response.Created(c, preview)
 }
 
+// GetProduct returns a single product by ID (v0.401 M1 - includes previews and images)
+// GET /marketplace/products/:id
+func (h *MarketplaceHandler) GetProduct(c *gin.Context) {
+	productID, err := uuid.Parse(c.Param("id"))
+	if err != nil {
+		response.BadRequest(c, "Invalid product id")
+		return
+	}
+	product, err := h.service.GetProduct(c.Request.Context(), productID)
+	if err != nil {
+		if err == marketplace.ErrProductNotFound {
+			response.NotFound(c, "Product not found")
+			return
+		}
+		response.InternalServerError(c, "Failed to get product")
+		return
+	}
+	response.Success(c, product)
+}
+
+// StreamProductPreview streams the first audio preview for a product (v0.401 M1)
+// GET /marketplace/products/:id/preview
+func (h *MarketplaceHandler) StreamProductPreview(c *gin.Context) {
+	productID, err := uuid.Parse(c.Param("id"))
+	if err != nil {
+		response.BadRequest(c, "Invalid product id")
+		return
+	}
+	product, err := h.service.GetProduct(c.Request.Context(), productID)
+	if err != nil || len(product.Previews) == 0 {
+		response.NotFound(c, "Preview not found")
+		return
+	}
+	preview := product.Previews[0]
+	fullPath := filepath.Join(h.uploadDir, preview.FilePath)
+	if _, err := os.Stat(fullPath); os.IsNotExist(err) {
+		response.NotFound(c, "Preview file not found")
+		return
+	}
+	c.Header("Content-Disposition", "inline")
+	c.File(fullPath)
+}
+
 // UpdateProductImagesRequest body for PUT /products/:id/images
 type UpdateProductImagesRequest struct {
 	Images []struct {
@@ -466,7 +510,7 @@ func (h *MarketplaceHandler) UpdateProduct(c *gin.Context) {
 		updates["title"] = *req.Title
 	}
 	if req.Description != nil {
-		updates["description"] = *req.Description
+		updates["description"] = utils.SanitizeHTML(*req.Description, 5000)
 	}
 	if req.Price != nil {
 		updates["price"] = *req.Price