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src/v1/routes/pimage.js

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+import sharp from 'sharp';
+import * as db from '../../db/posterminal.js';
+
+const MAX_DIMENSION = 200;
+
+/**
+ * @openapi
+ * /v1/pimage:
+ *   get:
+ *     tags: [POS]
+ *     summary: POS product image delivery
+ *     description: |
+ *       Returns product image by hash (`path` query param) scaled to preview size.
+ *     x-markdown: pos/pimage.md
+ *     parameters:
+ *       - in: query
+ *         name: path
+ *         required: true
+ *         schema:
+ *           type: string
+ *         description: SHA-256 hash of the product image
+ *         example: "71de4085ce2b1a53317832421009d844eec0c36a3ec071a31661cc2a212e15e6"
+ *       - in: query
+ *         name: w
+ *         required: false
+ *         schema:
+ *           type: integer
+ *           default: 200
+ *         description: Max width
+ *       - in: query
+ *         name: h
+ *         required: false
+ *         schema:
+ *           type: integer
+ *           default: 200
+ *         description: Max height
+ *       - in: query
+ *         name: format
+ *         required: false
+ *         schema:
+ *           type: string
+ *           enum: [jpeg, png, webp, avif]
+ *         description: Optional target format (defaults to jpeg/png or client Accept preference)
+ *     responses:
+ *       200:
+ *         description: Resized image binary
+ *         content:
+ *           image/jpeg:
+ *             schema:
+ *               type: string
+ *               format: binary
+ *           image/png:
+ *             schema:
+ *               type: string
+ *               format: binary
+ *           image/webp:
+ *             schema:
+ *               type: string
+ *               format: binary
+ *           image/avif:
+ *             schema:
+ *               type: string
+ *               format: binary
+ *       304:
+ *         description: Image not modified
+ *       400:
+ *         description: Missing required query parameter 'path'
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ *               properties:
+ *                 Message:
+ *                   type: string
+ *                   example: "Missing required query parameter 'path'."
+ *       404:
+ *         description: Image not found
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ *               properties:
+ *                 Message:
+ *                   type: string
+ *                   example: "No image was found for path 'abc'."
+ */
+export async function handlePimage(req, res) {
+    const rawPath = typeof req.query.path === 'string' ? req.query.path.trim() : '';
+
+    if (!rawPath) {
+        return res.status(400).json({ Message: "Missing required query parameter 'path'." });
+    }
+
+    const widthParam = req.query.w !== undefined ? Number(req.query.w) : MAX_DIMENSION;
+    const heightParam = req.query.h !== undefined ? Number(req.query.h) : MAX_DIMENSION;
+    const targetW = Number.isFinite(widthParam) && widthParam > 0 ? Math.min(Math.round(widthParam), 2000) : MAX_DIMENSION;
+    const targetH = Number.isFinite(heightParam) && heightParam > 0 ? Math.min(Math.round(heightParam), 2000) : MAX_DIMENSION;
+
+    try {
+        const image = await db.getPosImageByHash(rawPath, { width: targetW, height: targetH });
+        if (!image) {
+            return res.status(404).json({ Message: `No image was found for path '${rawPath}'.` });
+        }
+
+        const etag = `"${image.fullHash}-${targetW}x${targetH}"`;
+        const ifNoneMatch = req.headers['if-none-match'];
+        if (ifNoneMatch === etag || ifNoneMatch === image.fullHash || ifNoneMatch === `"${image.fullHash}"`) {
+            res.setHeader('ETag', etag);
+            res.setHeader('Cache-Control', 'public, max-age=86400');
+            return res.status(304).end();
+        }
+
+        let buffer = image.buffer;
+        let contentType = 'image/jpeg';
+
+        try {
+            const imageSharp = sharp(buffer);
+            const meta = await imageSharp.metadata();
+
+            let pipeline = imageSharp.resize(targetW, targetH, {
+                fit: 'inside',
+                withoutEnlargement: true,
+            });
+
+            const accept = String(req.headers.accept || '');
+            const formatParam = typeof req.query.format === 'string' ? req.query.format.toLowerCase() : '';
+
+            if (formatParam === 'avif' || (!formatParam && accept.includes('image/avif'))) {
+                pipeline = pipeline.avif({ effort: 2 });
+                contentType = 'image/avif';
+            } else if (formatParam === 'webp' || (!formatParam && accept.includes('image/webp'))) {
+                pipeline = pipeline.webp({ quality: 85 });
+                contentType = 'image/webp';
+            } else if (formatParam === 'png' || (!formatParam && meta.hasAlpha)) {
+                pipeline = pipeline.png();
+                contentType = 'image/png';
+            } else {
+                pipeline = pipeline.jpeg({ quality: 85 });
+                contentType = 'image/jpeg';
+            }
+
+            buffer = await pipeline.toBuffer();
+        } catch (resizeErr) {
+            console.warn(`[pimage] resize/convert fallback for ${rawPath}:`, resizeErr.message);
+        }
+
+        res.setHeader('Content-Type', contentType);
+        res.setHeader('Content-Length', String(buffer.length));
+        res.setHeader('Cache-Control', 'public, max-age=86400');
+        res.setHeader('ETag', etag);
+        return res.status(200).send(buffer);
+    } catch (err) {
+        console.error('POS /v1/pimage error:', err);
+        return res.status(500).json({ Message: 'Internal server error' });
+    }
+}