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initial scaffold: Pairs Well With This Design service (Express :9813 + algorithm + skill)
1d3d2f3c2b1c9638475a59f09bda1dcb7075753b · 2026-05-13 08:27:15 -0700 · Steve Abrams
Files touched
A .env.exampleA .gitignoreA lib/classify.jsA package-lock.jsonA package.jsonA server.js
Diff
commit 1d3d2f3c2b1c9638475a59f09bda1dcb7075753b
Author: Steve Abrams <steve@designerwallcoverings.com>
Date: Wed May 13 08:27:15 2026 -0700
initial scaffold: Pairs Well With This Design service (Express :9813 + algorithm + skill)
---
.env.example | 3 +
.gitignore | 9 +
lib/classify.js | 87 +++++
package-lock.json | 987 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
package.json | 15 +
server.js | 183 ++++++++++
6 files changed, 1284 insertions(+)
diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..d1cac40
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,3 @@
+DATABASE_URL=postgresql://dw_admin:DW2024SecurePass@127.0.0.1:15432/dw_unified
+PORT=9813
+CORS_ORIGIN=https://designerwallcoverings.com,https://designer-laboratory-sandbox.myshopify.com
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1eff7ab
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+node_modules/
+.env
+.env.local
+tmp/
+*.log
+.DS_Store
+dist/
+build/
+.next/
diff --git a/lib/classify.js b/lib/classify.js
new file mode 100644
index 0000000..c42c3c9
--- /dev/null
+++ b/lib/classify.js
@@ -0,0 +1,87 @@
+const COLORS = new Set([
+ 'beige','black','blue','brown','copper','cream','gold','gray','grey','green',
+ 'ivory','navy','orange','peach','pearl','pink','purple','red','rose','rust',
+ 'sage','salmon','silver','tan','taupe','teal','turquoise','white','yellow',
+ 'mauve','plum','aqua','charcoal','khaki','lavender','olive','platinum','bronze',
+ 'mustard','indigo','burgundy','coral','mint','seafoam','sand','stone',
+ 'light gray','light grey','light blue','light green','dark gray','dark grey',
+ 'dark blue','dark green','dusty blue','dusty pink','off white'
+]);
+
+const MOTIFS = new Set([
+ 'floral','damask','stripe','striped','geometric','solid','botanical','paisley',
+ 'toile','trellis','animal','abstract','texture','textured','medallion','plaid',
+ 'check','checkered','dot','polka dot','herringbone','chevron','ikat','suzani',
+ 'moroccan','arabesque','foliage','leaves','leaf','grass','grasscloth','brick',
+ 'wood','marble','tile','scenic','mural','figurative','typographic','script',
+ 'metallic','glitter','crystal','beaded','flocked','linen','silk','suede',
+ 'cork','foil','tropical','jungle','garden','landscape','urban','industrial'
+]);
+
+const ERAS = new Set([
+ 'modern','contemporary','traditional','mid-century','mid century','art deco',
+ 'victorian','rococo','transitional','vintage','retro','classic','antique',
+ 'colonial','federal','regency','baroque','neoclassical','gothic','arts and crafts',
+ 'art nouveau','bohemian','boho','minimalist','maximalist','farmhouse','rustic',
+ 'industrial','coastal','hamptons','scandinavian','japandi','mediterranean'
+]);
+
+const MATERIALS = new Set([
+ 'paper','vinyl','grasscloth','cork','foil','silk','linen','suede','glass beaded',
+ 'flocked','metallic','natural fiber','sisal','jute','raffia','bamboo','mica',
+ 'mylar','non-woven','non woven','peel and stick','peel-and-stick'
+]);
+
+function parseTags(tagsField) {
+ if (!tagsField) return [];
+ return String(tagsField)
+ .split(/[,;|]/)
+ .map(t => t.trim())
+ .filter(Boolean);
+}
+
+function classify(tags) {
+ const out = { colors: new Set(), motifs: new Set(), eras: new Set(), materials: new Set(), vendor: null, raw: tags };
+ for (const t of tags) {
+ const k = t.toLowerCase();
+ if (COLORS.has(k)) out.colors.add(k);
+ else if (MOTIFS.has(k)) out.motifs.add(k);
+ else if (ERAS.has(k)) out.eras.add(k);
+ else if (MATERIALS.has(k)) out.materials.add(k);
+ }
+ return out;
+}
+
+function intersect(a, b) {
+ const out = [];
+ for (const x of a) if (b.has(x)) out.push(x);
+ return out;
+}
+
+function score(source, candidate, candidateVendor, sourceVendor, candidatePattern, sourcePattern) {
+ const sharedColors = intersect(source.colors, candidate.colors);
+ const sharedEras = intersect(source.eras, candidate.eras);
+ const sharedMotifs = intersect(source.motifs, candidate.motifs);
+ const sharedMaterials = intersect(source.materials, candidate.materials);
+
+ let s = 0;
+ s += sharedColors.length * 3;
+ s += sharedEras.length * 2;
+ s += sharedMaterials.length * 1;
+ s -= sharedMotifs.length * 2;
+ if (sourceVendor && candidateVendor && sourceVendor === candidateVendor) s += 1;
+ if (sourcePattern && candidatePattern && sourcePattern.toLowerCase() === candidatePattern.toLowerCase()) s -= 5;
+
+ const why = [];
+ if (sharedColors.length) why.push(`Shared color: ${sharedColors.join(', ')}`);
+ if (sharedEras.length) why.push(`Shared era: ${sharedEras.join(', ')}`);
+ if (sourceVendor && candidateVendor && sourceVendor === candidateVendor) why.push(`Same designer (${sourceVendor})`);
+ const contrastMotifs = [...candidate.motifs].filter(m => !source.motifs.has(m));
+ if (contrastMotifs.length && source.motifs.size) {
+ why.push(`Motif contrast: ${[...source.motifs][0]} → ${contrastMotifs[0]}`);
+ }
+
+ return { score: s, why };
+}
+
+module.exports = { parseTags, classify, score, COLORS, MOTIFS, ERAS, MATERIALS };
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..7393a2b
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,987 @@
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+ "name": "dw-pairs-well",
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+ "lockfileVersion": 3,
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+ "name": "dw-pairs-well",
+ "version": "0.1.0",
+ "dependencies": {
+ "dotenv": "^16.4.5",
+ "express": "^4.19.2",
+ "pg": "^8.11.5"
+ }
+ },
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+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..f0fdb2f
--- /dev/null
+++ b/package.json
@@ -0,0 +1,15 @@
+{
+ "name": "dw-pairs-well",
+ "version": "0.1.0",
+ "description": "Returns 6 design-coordinating wallcoverings for any DW SKU — powers the Pairs Well With This Design button on Shopify product pages.",
+ "main": "server.js",
+ "scripts": {
+ "start": "node server.js",
+ "dev": "PORT=9799 node server.js"
+ },
+ "dependencies": {
+ "dotenv": "^16.4.5",
+ "express": "^4.19.2",
+ "pg": "^8.11.5"
+ }
+}
diff --git a/server.js b/server.js
new file mode 100644
index 0000000..da5d29d
--- /dev/null
+++ b/server.js
@@ -0,0 +1,183 @@
+require('dotenv').config();
+const express = require('express');
+const { Pool } = require('pg');
+const path = require('path');
+const { parseTags, classify, score } = require('./lib/classify');
+
+const PORT = Number(process.env.PORT || 9799);
+const DATABASE_URL = process.env.DATABASE_URL;
+const CORS_ORIGINS = (process.env.CORS_ORIGIN || '*')
+ .split(',').map(s => s.trim()).filter(Boolean);
+
+if (!DATABASE_URL) {
+ console.error('FATAL: DATABASE_URL not set — copy .env.example to .env');
+ process.exit(1);
+}
+
+const pool = new Pool({ connectionString: DATABASE_URL });
+
+const app = express();
+app.disable('x-powered-by');
+
+app.use((req, res, next) => {
+ const origin = req.headers.origin;
+ if (CORS_ORIGINS.includes('*') || (origin && CORS_ORIGINS.includes(origin))) {
+ res.setHeader('Access-Control-Allow-Origin', origin || '*');
+ res.setHeader('Vary', 'Origin');
+ }
+ res.setHeader('Access-Control-Allow-Methods', 'GET, OPTIONS');
+ res.setHeader('Access-Control-Allow-Headers', 'Content-Type');
+ if (req.method === 'OPTIONS') return res.sendStatus(204);
+ next();
+});
+
+app.use(express.static(path.join(__dirname, 'public')));
+
+app.get('/healthz', async (_req, res) => {
+ try {
+ const r = await pool.query('SELECT 1 AS ok');
+ res.json({ ok: true, db: r.rows[0].ok === 1, ts: new Date().toISOString() });
+ } catch (e) {
+ res.status(500).json({ ok: false, error: e.message });
+ }
+});
+
+const SAFE_KEY = /^[A-Za-z0-9._\-]{1,128}$/;
+
+async function loadSource({ dw_sku, handle }) {
+ let q, params;
+ if (dw_sku) {
+ q = `SELECT dw_sku, handle, title, vendor, image_url, tags, pattern_name
+ FROM shopify_products
+ WHERE dw_sku = $1
+ LIMIT 1`;
+ params = [dw_sku];
+ } else if (handle) {
+ q = `SELECT dw_sku, handle, title, vendor, image_url, tags, pattern_name
+ FROM shopify_products
+ WHERE handle = $1
+ LIMIT 1`;
+ params = [handle];
+ } else {
+ return null;
+ }
+ const r = await pool.query(q, params);
+ return r.rows[0] || null;
+}
+
+async function loadCandidates(source, limit = 400) {
+ const tags = parseTags(source.tags);
+ const cls = classify(tags);
+ const colorList = [...cls.colors];
+ const eraList = [...cls.eras];
+
+ // Broad SQL filter: ACTIVE, has image, has handle, not the source itself,
+ // AND tags overlap on at least one color OR era OR same vendor.
+ // Then we score in JS for the final ranking.
+ const tokens = [...colorList, ...eraList];
+ const patterns = tokens.map(t => `%${t}%`);
+ const params = [source.dw_sku || '', source.vendor || ''];
+ let whereExtras = `(sp.vendor = $2 AND $2 <> '')`;
+ if (patterns.length) {
+ const startIdx = params.length + 1;
+ const placeholders = patterns.map((_, i) => `lower(sp.tags) LIKE lower($${startIdx + i})`).join(' OR ');
+ whereExtras = `(${whereExtras} OR ${placeholders})`;
+ params.push(...patterns);
+ }
+ params.push(limit);
+
+ const q = `
+ SELECT dw_sku, handle, title, vendor, image_url, tags, pattern_name
+ FROM shopify_products AS sp
+ WHERE status = 'ACTIVE'
+ AND image_url IS NOT NULL
+ AND handle IS NOT NULL
+ AND dw_sku IS NOT NULL
+ AND dw_sku <> $1
+ AND ${whereExtras}
+ ORDER BY synced_at DESC NULLS LAST
+ LIMIT $${params.length}
+ `;
+ const r = await pool.query(q, params);
+ return r.rows;
+}
+
+function pickPairs(source, candidates, k = 6) {
+ const sCls = classify(parseTags(source.tags));
+ const scored = candidates.map(c => {
+ const cCls = classify(parseTags(c.tags));
+ const { score: s, why } = score(sCls, cCls, c.vendor, source.vendor, c.pattern_name, source.pattern_name);
+ return { ...c, _score: s, _why: why };
+ });
+
+ scored.sort((a, b) => b._score - a._score);
+
+ const out = [];
+ const seenPatterns = new Set();
+ const vendorCount = new Map();
+ for (const x of scored) {
+ if (out.length >= k) break;
+ const pat = (x.pattern_name || x.handle || '').toLowerCase();
+ if (pat && seenPatterns.has(pat)) continue;
+ const vc = vendorCount.get(x.vendor) || 0;
+ if (vc >= 3) continue;
+ out.push(x);
+ if (pat) seenPatterns.add(pat);
+ vendorCount.set(x.vendor, vc + 1);
+ }
+ return out;
+}
+
+app.get('/api/pairs', async (req, res) => {
+ try {
+ const dw_sku = req.query.dw_sku && SAFE_KEY.test(req.query.dw_sku) ? req.query.dw_sku : null;
+ const handle = req.query.handle && SAFE_KEY.test(req.query.handle) ? req.query.handle : null;
+ if (!dw_sku && !handle) {
+ return res.status(400).json({ ok: false, error: 'pass ?dw_sku=… or ?handle=…' });
+ }
+
+ const source = await loadSource({ dw_sku, handle });
+ if (!source) return res.status(404).json({ ok: false, error: 'source not found' });
+
+ if (!source.tags || !parseTags(source.tags).length) {
+ return res.json({
+ ok: true,
+ source: { dw_sku: source.dw_sku, handle: source.handle, title: source.title, image_url: source.image_url, vendor: source.vendor },
+ pairs: [],
+ reason: 'no tags on source — cannot compute pairings'
+ });
+ }
+
+ const candidates = await loadCandidates(source);
+ const top = pickPairs(source, candidates, 6);
+
+ res.set('Cache-Control', 'public, max-age=300');
+ res.json({
+ ok: true,
+ source: {
+ dw_sku: source.dw_sku,
+ handle: source.handle,
+ title: source.title,
+ vendor: source.vendor,
+ image_url: source.image_url
+ },
+ pairs: top.map(p => ({
+ dw_sku: p.dw_sku,
+ handle: p.handle,
+ title: p.title,
+ vendor: p.vendor,
+ image_url: p.image_url,
+ url: `/products/${p.handle}`,
+ score: p._score,
+ why: p._why
+ }))
+ });
+ } catch (e) {
+ console.error('pairs error', e);
+ res.status(500).json({ ok: false, error: e.message });
+ }
+});
+
+app.listen(PORT, () => {
+ console.log(`dw-pairs-well listening on :${PORT}`);
+});
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