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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 | /** * Middleware generator */ import { writeFileSync, existsSync, mkdirSync } from 'fs'; import { join } from 'path'; /** * Generate a new middleware module */ export async function generateMiddleware(name, options = {}) { const { path = 'src/middleware', template = 'basic', skipTest = false } = options; const middlewareName = `${toPascalCase(name).replace(/Middleware$/u, '')}Middleware`; const functionName = `${toCamelCase(name).replace(/Middleware$/u, '')}Middleware`; const fileName = `${toKebabCase(name).replace(/-middleware$/u, '')}-middleware`; const outputDir = join(process.cwd(), path); if (!existsSync(outputDir)) { mkdirSync(outputDir, { recursive: true }); } const files = []; const nextSteps = []; const middlewarePath = join(outputDir, `${fileName}.js`); const middlewareContent = generateMiddlewareContent({ middlewareName, functionName, template }); writeFileSync(middlewarePath, middlewareContent); files.push(middlewarePath); if (!skipTest) { const testPath = join(outputDir, `${fileName}.test.js`); const testContent = generateMiddlewareTestContent({ middlewareName, functionName, template, fileName }); writeFileSync(testPath, testContent); files.push(testPath); } nextSteps.push(`Register the middleware in your server: import { ${middlewareName} } from '${path}/${fileName}.js'`); nextSteps.push(`Use it with your framework (Express/Fastify/Koa) depending on the template`); if (!skipTest) { nextSteps.push('Run tests: npm test'); } return { files, nextSteps }; } function generateMiddlewareContent({ middlewareName, functionName, template }) { switch (template) { case 'fastify': return generateFastifyMiddleware({ middlewareName }); case 'auth': return generateAuthMiddleware({ middlewareName, functionName }); case 'logging': return generateLoggingMiddleware({ middlewareName, functionName }); case 'koa': return generateKoaMiddleware({ middlewareName, functionName }); default: return generateExpressMiddleware({ middlewareName, functionName }); } } function generateExpressMiddleware({ middlewareName, functionName }) { return `/** * ${middlewareName} - Express style middleware */ export function ${functionName}(req, res, next) { // Add middleware logic here // Example: attach request context req.context = req.context || {}; req.context.startedAt = Date.now(); next(); } export default ${functionName}; `; } function generateFastifyMiddleware({ middlewareName }) { return `/** * ${middlewareName} - Fastify plugin */ export async function ${middlewareName}(fastify, options) { fastify.addHook('onRequest', async (request, reply) => { request.context = request.context || {}; request.context.startedAt = Date.now(); }); fastify.decorateRequest('getContext', function getContext() { return this.context || {}; }); } export default ${middlewareName}; `; } function generateAuthMiddleware({ middlewareName, functionName }) { return `/** * ${middlewareName} - Authentication middleware */ export function ${functionName}(options = {}) { const { header = 'authorization', tokenPrefix = 'Bearer ' } = options; return (req, res, next) => { const token = req.headers?.[header]?.toString(); if (!token || !token.startsWith(tokenPrefix)) { res.statusCode = 401; res.end(JSON.stringify({ _error: 'Unauthorized' })); return; } req.user = { token: token.slice(tokenPrefix.length), scopes: ['read'] }; next(); }; } export default ${functionName}; `; } function generateLoggingMiddleware({ middlewareName, functionName }) { return `/** * ${middlewareName} - Request logging middleware */ export function ${functionName}(logger = console) { return (req, res, next) => { const start = process.hrtime.bigint(); res.on('finish', () => { const duration = Number(process.hrtime.bigint() - start) / 1_000_000; logger.info?.( '[Request]', req.method, req.url, res.statusCode, { duration: duration.toFixed(2) + 'ms' } ); }); next(); }; } export default ${functionName}; `; } function generateKoaMiddleware({ middlewareName, functionName }) { return `/** * ${middlewareName} - Koa compatible middleware */ export async function ${functionName}(ctx, next) { ctx.state = ctx.state || {}; ctx.state.requestId = ctx.state.requestId || crypto.randomUUID?.() || Date.now().toString(); await next(); } export default ${functionName}; `; } function generateMiddlewareTestContent({ middlewareName, functionName, template, fileName }) { if (template === 'fastify') { return `import { test } from 'node:test'; import assert from 'node:assert/strict'; import Fastify from 'fastify'; import ${middlewareName} from './${fileName}.js'; test('${middlewareName} registers fastify hook', async () => { const fastify = Fastify(); await fastify.register(${middlewareName}); assert.ok(fastify.hasDecorator('getContext')); }); `; } return `import { test } from 'node:test'; import assert from 'node:assert/strict'; import http from 'node:http'; import ${functionName} from './${fileName}.js'; test('${middlewareName} executes without errors', (t, done) => { const middleware = typeof ${functionName} === 'function' ? ${functionName}() : ${functionName}; const req = new http.IncomingMessage(); const res = new http.ServerResponse(req); req.headers = {}; middleware(req, res, () => { assert.ok(true); done(); }); }); `; } function toPascalCase(str) { return str .replace(/[-_\s]+(.)?/g, (_, c) => (c ? c.toUpperCase() : '')) .replace(/^(.)/, (_, c) => c.toUpperCase()); } function toCamelCase(str) { const pascal = toPascalCase(str); return pascal.charAt(0).toLowerCase() + pascal.slice(1); } function toKebabCase(str) { return str .replace(/([a-z0-9])([A-Z])/g, '$1-$2') .replace(/[_\s]+/g, '-') .toLowerCase(); } |