import fs from 'fs';
import path from 'path';
import { execSync } from 'child_process';
export function generateMcpTools(openApiSpec, outputDir) {
try {
console.log('Generating client code from OpenAPI spec using openapi-zod-client...');
if (!fs.existsSync(outputDir)) {
fs.mkdirSync(outputDir, { recursive: true });
console.log(`Created directory: ${outputDir}`);
}
const rootDir = path.resolve(outputDir, '../..');
const openapiDir = path.join(rootDir, 'openapi');
const openapiTrimmedFile = path.join(openapiDir, 'openapi-trimmed.yaml');
const clientFilePath = path.join(outputDir, 'client.ts');
execSync(
`npx -y openapi-zod-client "${openapiTrimmedFile}" -o "${clientFilePath}" --with-description --strict-objects --additional-props-default-value=false`,
{
stdio: 'inherit',
}
);
console.log(`Generated client code at: ${clientFilePath}`);
let clientCode = fs.readFileSync(clientFilePath, 'utf-8');
clientCode = clientCode.replace(/'@zodios\/core';/, "'./hack.js';");
clientCode = clientCode.replace(
/const microsoft_graph_attachment = z\s+\.object\({[\s\S]*?}\)\s+\.strict\(\);/,
(match) => match.replace(/\.strict\(\);/, '.passthrough();')
);
console.log('Stripping unused errors arrays from endpoint definitions...');
// I didn't make up this crazy regex myself; you know who did. It seems works though.
clientCode = clientCode.replace(/,?\s*errors:\s*\[[\s\S]*?],?(?=\s*})/g, '');
console.log('Decoding HTML entities in path patterns...');
// openapi-zod-client HTML-encodes special characters in path patterns
// This breaks Microsoft Graph function-style APIs like range(address='A1:G10')
clientCode = clientCode.replace(/=/g, '='); // Decode = sign
clientCode = clientCode.replace(/'/g, "'"); // Decode single quote
clientCode = clientCode.replace(/(/g, '('); // Decode left paren
clientCode = clientCode.replace(/)/g, ')'); // Decode right paren
clientCode = clientCode.replace(/:/g, ':'); // Decode colon
console.log('Fixing function-style API paths with template literals...');
// After HTML decoding, paths like range(address=':address') have nested single quotes
// which cause TypeScript syntax errors. Convert the path string from single quotes
// to backticks (template literal) so single quotes can remain inside.
// Match: path: '/...range(param=':value')...',
// Replace with: path: `/...range(param=':value')...`,
clientCode = clientCode.replace(/(path:\s*)'(\/[^']*\([^)]*=':[\w]+'\)[^']*)'/g, '$1`$2`');
fs.writeFileSync(clientFilePath, clientCode);
return true;
} catch (error) {
throw new Error(`Error generating client code: ${error.message}`);
}
}
