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const PRELUDE = `
define('STDIN', fopen('php://stdin', 'r'));
define('STDOUT', fopen('php://stdout', 'r'));
define('STDERR', fopen('php://stderr', 'r'));
error_reporting(E_ALL & ~E_WARNING & ~E_NOTICE & ~E_DEPRECATED);
`;
const BUFFER_MAX = 10 * 1024;
const FORBIDDEN_CONSTRUCTS = [/\beval\b/i];
export function validateCode(code) {
for (const pattern of FORBIDDEN_CONSTRUCTS) {
if (pattern.test(code)) {
return `Forbidden: eval() is not allowed`;
}
}
return null;
}
export function preprocessCode(originalCode) {
if (originalCode.startsWith("<?php")) {
return PRELUDE + originalCode.slice(5);
}
if (originalCode.startsWith("<?")) {
return PRELUDE + originalCode.slice(2);
}
return PRELUDE + originalCode;
}
export function createIOCallbacks(input) {
let stdinPos = 0;
const stdinBuf = Buffer.from(input);
let stdoutPos = 0;
const stdoutBuf = Buffer.alloc(BUFFER_MAX);
let stderrPos = 0;
const stderrBuf = Buffer.alloc(BUFFER_MAX);
return {
stdin: () => {
if (stdinBuf.length <= stdinPos) {
return null;
}
return stdinBuf.readUInt8(stdinPos++);
},
stdout: (asciiCode) => {
if (asciiCode === null) {
return;
}
if (BUFFER_MAX <= stdoutPos) {
return;
}
stdoutBuf.writeUInt8(
asciiCode < 0 ? asciiCode + 256 : asciiCode,
stdoutPos++,
);
},
stderr: (asciiCode) => {
if (asciiCode === null) {
return;
}
if (BUFFER_MAX <= stderrPos) {
return;
}
stderrBuf.writeUInt8(
asciiCode < 0 ? asciiCode + 256 : asciiCode,
stderrPos++,
);
},
getStdout: () => stdoutBuf.subarray(0, stdoutPos).toString(),
getStderr: () => stderrBuf.subarray(0, stderrPos).toString(),
};
}
export function buildResult(err, ccallResult, getStdout, getStderr) {
if (err) {
return {
status: "runtime_error",
stdout: getStdout(),
stderr: `${getStderr()}\n${err.toString()}`,
};
}
return {
status: ccallResult === 0 ? "success" : "runtime_error",
stdout: getStdout(),
stderr: getStderr(),
};
}
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