feat: spec graph

server.js

@@ -0,0 +1,80 @@
+const express = require('express');
+const path = require('path');
+const yaml = require('js-yaml');
+
+const app = express();
+const PORT = process.env.PORT || 3000;
+
+app.use(express.static(path.join(__dirname, 'public')));
+app.use(express.json({ limit: '2mb' }));
+
+app.get('/api/health', (req, res) => {
+  res.json({ status: 'ok' });
+});
+
+function buildGraphFromPaths(pathsObject) {
+  const httpMethods = new Set(['get','put','post','delete','options','head','patch','trace']);
+  const nodeIdSet = new Set();
+  const linkKeySet = new Set();
+  const nodes = [];
+  const links = [];
+  const endpoints = [];
+
+  for (const pathKey of Object.keys(pathsObject || {})) {
+    const pathItem = pathsObject[pathKey] || {};
+    // Collect endpoints
+    for (const method of Object.keys(pathItem)) {
+      const lower = method.toLowerCase();
+      if (httpMethods.has(lower)) {
+        endpoints.push({ method: lower.toUpperCase(), path: pathKey });
+      }
+    }
+    // Build nodes/links from URL segments
+    const segments = pathKey.split('/').filter(Boolean);
+    if (segments.length === 0) continue;
+
+    // Ensure nodes
+    for (const seg of segments) {
+      if (!nodeIdSet.has(seg)) {
+        nodeIdSet.add(seg);
+        nodes.push({ id: seg });
+      }
+    }
+
+    // Create sequential links along the path
+    for (let i = 0; i < segments.length - 1; i++) {
+      const source = segments[i];
+      const target = segments[i + 1];
+      const key = `${source}|${target}`;
+      if (!linkKeySet.has(key)) {
+        linkKeySet.add(key);
+        links.push({ source, target });
+      }
+    }
+  }
+
+  return { nodes, links, endpoints };
+}
+
+app.post('/api/parse', (req, res) => {
+  try {
+    const { yaml: yamlText } = req.body || {};
+    if (typeof yamlText !== 'string' || yamlText.trim() === '') {
+      return res.status(400).json({ error: 'Missing yaml string in body' });
+    }
+    const spec = yaml.load(yamlText);
+    if (!spec || typeof spec !== 'object') {
+      return res.status(400).json({ error: 'Invalid YAML content' });
+    }
+
+    const pathsObject = spec.paths || {};
+    const graph = buildGraphFromPaths(pathsObject);
+    res.json({ graph, info: { title: spec.info && spec.info.title, version: spec.info && spec.info.version } });
+  } catch (err) {
+    res.status(400).json({ error: err.message || 'Failed to parse YAML' });
+  }
+});
+
+app.listen(PORT, () => {
+  console.log(`Server listening on http://localhost:${PORT}`);
+});