Add expanded backend test suite for issue #335

.github/workflows/backend-tests.yml

@@ -0,0 +1,40 @@
+name: Backend Tests
+
+on:
+  pull_request:
+    paths:
+      - 'backend/**'
+      - 'config/distros.json'
+      - '.github/workflows/backend-tests.yml'
+  push:
+    branches:
+      - master
+    paths:
+      - 'backend/**'
+      - 'config/distros.json'
+      - '.github/workflows/backend-tests.yml'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    defaults:
+      run:
+        working-directory: backend
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+          cache-dependency-path: backend/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run backend tests
+        run: npm test

backend/app.js

@@ -0,0 +1,159 @@
+import express from 'express';
+import cors from 'cors';
+import swaggerJsdoc from 'swagger-jsdoc';
+import swaggerUi from 'swagger-ui-express';
+import { SUPPORTED_DISTROS, MAX_RECORDS_TO_SEND } from './config.js';
+import { buildDistroBitMap, getTables, stringifyBigInts } from './utils.js';
+
+const createCorsMiddleware = () => {
+  const allowedOrigins = process.env.ALLOWED_ORIGINS
+    ? process.env.ALLOWED_ORIGINS.split(',')
+    : ['http://localhost:3000'];
+
+  return cors({
+    origin: (origin, callback) => {
+      if (!origin) return callback(null, true);
+      if (allowedOrigins.indexOf(origin) === -1) {
+        const msg = 'The CORS policy for this site does not allow access from the specified Origin.';
+        return callback(new Error(msg), false);
+      }
+      return callback(null, true);
+    }
+  });
+};
+
+const createSwaggerMiddleware = () => {
+  const swaggerOptions = {
+    definition: {
+      openapi: '3.0.0',
+      info: {
+        title: 'Software Discovery Tool API',
+        version: '1.0.0',
+        description: 'REST API for the Open Mainframe Software Discovery Tool. Replaces the Flask backend.',
+      },
+      servers: [{ url: `http://localhost:${process.env.PORT || 5000}` }],
+    },
+    apis: ['./app.js'],
+  };
+  const swaggerSpec = swaggerJsdoc(swaggerOptions);
+  return [swaggerUi.serve, swaggerUi.setup(swaggerSpec)];
+};
+
+export const createApp = (pool) => {
+  const app = express();
+  const distroBitMap = buildDistroBitMap(SUPPORTED_DISTROS);
+
+  app.use(createCorsMiddleware());
+  app.use(express.json());
+  app.use('/api-docs', ...createSwaggerMiddleware());
+
+  const setNoCacheHeaders = (res) => {
+    res.setHeader('Cache-Control', 'no-cache, no-store, must-revalidate');
+    res.setHeader('Pragma', 'no-cache');
+    res.setHeader('Expires', '0');
+  };
+
+  const getSupportedDistrosHandler = (req, res) => {
+    setNoCacheHeaders(res);
+    res.json(stringifyBigInts(distroBitMap));
+  };
+
+  app.get('/getSupportedDistros', getSupportedDistrosHandler);
+  app.get('/sdt/getSupportedDistros', getSupportedDistrosHandler);
+
+  app.get(['/searchPackages', '/sdt/searchPackages'], async (req, res) => {
+    const searchTerm = (req.query.search_term || '').trim();
+    const exactMatch = req.query.exact_match === 'true';
+    const searchDescription = req.query.search_description === 'true';
+    const searchBitFlag = req.query.search_bit_flag || '0';
+    const pageNumber = parseInt(req.query.page_number || '0');
+    const limit = Math.min(parseInt(req.query.limit || MAX_RECORDS_TO_SEND), 500);
+
+    if (isNaN(pageNumber) || pageNumber < 0) {
+      return res.status(400).json({ error: 'Invalid page_number' });
+    }
+
+    if (isNaN(limit) || limit <= 0) {
+      return res.status(400).json({ error: 'Invalid limit' });
+    }
+
+    try {
+      BigInt(searchBitFlag);
+    } catch (e) {
+      return res.status(400).json({ error: 'Invalid search_bit_flag' });
+    }
+
+    if (!searchTerm) {
+      return res.json({
+        total_packages: 0,
+        current_page: 0,
+        last_page: 0,
+        more_available: false,
+        packages: []
+      });
+    }
+
+    try {
+      const tables = getTables(searchBitFlag, distroBitMap, SUPPORTED_DISTROS);
+      if (tables.length === 0) {
+        return res.json({
+          total_packages: 0,
+          current_page: pageNumber,
+          last_page: 0,
+          more_available: false,
+          packages: []
+        });
+      }
+
+      let sqlSearchTerm = searchTerm;
+      if (!exactMatch) {
+        if (sqlSearchTerm.includes('*')) {
+          sqlSearchTerm = sqlSearchTerm.replace(/\*/g, '%');
+        } else {
+          sqlSearchTerm = `%${sqlSearchTerm}%`;
+        }
+      }
+
+      const subQuery = exactMatch
+        ? 'SELECT packageName, description, version, osName FROM ?? WHERE packageName = ?'
+        : (searchDescription
+            ? 'SELECT packageName, description, version, osName FROM ?? WHERE (packageName LIKE ? OR description LIKE ?)'
+            : 'SELECT packageName, description, version, osName FROM ?? WHERE packageName LIKE ?');
+
+      const unionQuery = tables.map(() => `(${subQuery})`).join(' UNION ALL ');
+      const countQuery = `SELECT COUNT(*) as total FROM (${unionQuery}) AS combined`;
+
+      const queryParams = [];
+      tables.forEach(table => {
+        queryParams.push(table);
+        queryParams.push(sqlSearchTerm);
+        if (!exactMatch && searchDescription) {
+          queryParams.push(sqlSearchTerm);
+        }
+      });
+
+      const [countResult] = await pool.query(countQuery, queryParams);
+      const totalLength = countResult[0].total;
+
+      const dataQuery = `${unionQuery} LIMIT ? OFFSET ?`;
+      const dataParams = [...queryParams, limit, pageNumber * limit];
+
+      const [results] = await pool.query(dataQuery, dataParams);
+      const lastPage = Math.ceil(totalLength / limit);
+
+      setNoCacheHeaders(res);
+      res.json({
+        total_packages: totalLength,
+        current_page: pageNumber,
+        last_page: lastPage,
+        more_available: (pageNumber + 1) * limit < totalLength,
+        packages: results
+      });
+    } catch (err) {
+      console.error(err);
+      res.status(500).json({ error: 'Internal server error' });
+    }
+  });
+
+  return app;
+};