Rip out go, add aliases to /versions

api/src/index.js

@@ -0,0 +1,99 @@
+const { writeFile } = require('fs/promises');
+const express = require('express');
+const app = express();
+const languages = require('./languages');
+const { spawn, execFileSync } = require('child_process');
+
+const versions = execFileSync(__dirname + '/../../lxc/versions')
+    .toString()
+    .toLowerCase()
+    .split('---')
+    .map(section => section.split('\n'))
+    .filter(section => section.length >= 2);
+
+function getVersion(language) {
+    return versions.find(section => section[0] === language?.name);
+}
+
+for (const language of languages) {
+    // TODO: Add custom handlers for some languages
+
+    language.version = getVersion(language);
+}
+
+app.use(express.json());
+
+app.post('/execute', (req, res) => {
+    const body = req.body;
+
+    const language = languages.find(language => {
+        return language.aliases.includes(body.language?.toString()?.toLowerCase());
+    });
+
+    if (!language) {
+        return res.status(400).json({
+            code: 'unsupported_language',
+            message: `${body.language} is not supported by Piston`,
+        });
+    } else if (!(body.source instanceof string)) {
+        return res.status(400).json({
+            code: 'missing_source',
+            message: 'source field is invalid',
+        });
+    } else if (body.args && !(body.args instanceof Array)) {
+        return res.status(400).json({
+            code: 'invalid_args',
+            message: 'args field is not an array',
+        });
+    }
+
+    launch(res, language, body);
+});
+
+async function launch(res, language, body) {
+    const stamp = new Date().getTime();
+    const sourceFile = `/tmp/${stamp}.code`;
+
+    await writeFile(sourceFile, body.source);
+
+    const process = spawn(__dirname + '/../../lxc/execute', [language.name, sourceFile, (body.args ?? []).join('\n')]);
+
+    const result = {
+        ran: true,
+        language: language.name,
+        stderr: '',
+        stdout: '',
+        output: '',
+    };
+
+    if (language.version)
+        result.version = language.version;
+
+    process.stderr.setEncoding('utf-8');
+    process.stdout.setEncoding('utf-8');
+
+    process.stderr.addListener('data', chunk => {
+        result.stderr += chunk;
+        result.output += chunk;
+    });
+
+    process.stdout.addListener('data', chunk => {
+        result.stdout += chunk;
+        result.output += chunk;
+    });
+
+    result.stderr = result.stderr.substring(0, 65535);
+    result.stdout = result.stdout.substring(0, 65535);
+    result.output = result.output.substring(0, 65535);
+
+    process.on('exit', () => {
+        res.json(result);
+    });
+}
+
+app.get('/versions', (req, res) => {
+    res.json(languages);
+});
+
+const PORT = 2000;
+app.listen(PORT, () => console.log(`Listening on port ${PORT}`));