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/**
* Static checks and transpilation of agent-submitted code.
*
* Agent code is the body of an async function receiving `sdk` and
* `console`. Module syntax and dynamic `import()` are rejected before
* execution; the Deno sandbox additionally disables string code generation
* so imports cannot be smuggled through eval. These checks are defence in
* depth, not the security boundary: the separate, permissionless Deno
* process is.
*
* @module executor/code-policy
*/
import ts from "typescript";
import type { Diagnostic, ExecutionError } from "./types.js";
/** Number of wrapper lines that precede agent code. */
export const WRAPPER_HEADER_LINES = 1;
/** Result of preparing code. */
export type PreparedCode =
| { ok: true; moduleBase64: string; js: string }
| { ok: false; error: ExecutionError; violations?: string[] };
/**
* Wrap agent code for transpilation and execution.
*
* @param {String} code - agent code
* @return {String} module source
*/
export function wrapForExecution(code: string): string {
return `export default async function __oagMcpMain(sdk, console) {\n${code}\n}\n`;
}
/**
* Wrap agent code for type checking against the global `sdk` declaration.
*
* @param {String} code - agent code
* @return {String} TypeScript source
*/
export function wrapForTypecheck(code: string): string {
return `export {}; async function __oagMcpMain() {\n${code}\n}\n`;
}
/**
* Convert a TypeScript diagnostic to agent coordinates.
*
* @param {Object} d - diagnostic
* @return {Object|undefined} mapped diagnostic
*/
export function mapDiagnostic(d: ts.Diagnostic): Diagnostic | undefined {
if (!d.file || d.start === undefined) {
return {
line: 0,
column: 0,
code: d.code,
message: ts.flattenDiagnosticMessageText(d.messageText, "\n"),
};
}
const pos = d.file.getLineAndCharacterOfPosition(d.start);
const line = pos.line + 1 - WRAPPER_HEADER_LINES;
return {
line: Math.max(line, 1),
column: pos.character + 1,
code: d.code,
message: ts.flattenDiagnosticMessageText(d.messageText, "\n"),
};
}
/** Module-loading constructs agent code may not use, and how to name them. */
const MODULE_LOADERS: ReadonlyArray<[(n: ts.Node) => boolean, string]> = [
[
(n) =>
ts.isCallExpression(n) &&
n.expression.kind === ts.SyntaxKind.ImportKeyword,
"dynamic import()",
],
[
(n) =>
ts.isMetaProperty(n) && n.keywordToken === ts.SyntaxKind.ImportKeyword,
"import.meta",
],
[
(n) =>
ts.isCallExpression(n) &&
ts.isIdentifier(n.expression) &&
n.expression.text === "require",
"require()",
],
[
(n) =>
ts.isImportDeclaration(n) ||
ts.isImportEqualsDeclaration(n) ||
(ts.isExportDeclaration(n) && Boolean(n.moduleSpecifier)),
"module import",
],
];
/**
* Find module-loading constructs in agent code.
*
* @param {String} code - agent code
* @param {String} language - "typescript" or "javascript"
* @return {Array} violation descriptions with line numbers
*/
export function findViolations(
code: string,
language: "typescript" | "javascript",
): string[] {
const sf = ts.createSourceFile(
language === "typescript" ? "agent.ts" : "agent.js",
wrapForExecution(code),
ts.ScriptTarget.ES2022,
true,
language === "typescript" ? ts.ScriptKind.TS : ts.ScriptKind.JS,
);
const out: string[] = [];
const visit = (n: ts.Node) => {
const loader = MODULE_LOADERS.find(([matches]) => matches(n));
if (loader) {
const line =
sf.getLineAndCharacterOfPosition(n.getStart(sf)).line +
1 -
WRAPPER_HEADER_LINES;
out.push(`${loader[1]} at line ${line}`);
}
ts.forEachChild(n, visit);
};
visit(sf);
return out;
}
/**
* Validate and transpile agent code into a base64 ES module.
*
* @param {String} code - agent code
* @param {String} language - "typescript" or "javascript"
* @param {Number} maxBytes - maximum accepted code size
* @return {Object} prepared code or error
*/
export function prepareCode(
code: string,
language: "typescript" | "javascript",
maxBytes: number,
): PreparedCode {
if (Buffer.byteLength(code) > maxBytes) {
return {
ok: false,
error: {
type: "resource_limit",
reason: "code_too_large",
message: `Code is ${Buffer.byteLength(code)} bytes; the limit is ${maxBytes}`,
},
};
}
const result = ts.transpileModule(wrapForExecution(code), {
fileName: language === "typescript" ? "agent.ts" : "agent.js",
reportDiagnostics: true,
compilerOptions: {
target: ts.ScriptTarget.ES2022,
module: ts.ModuleKind.ESNext,
allowJs: true,
sourceMap: false,
removeComments: false,
},
});
const syntax = (result.diagnostics ?? [])
.filter((d) => d.category === ts.DiagnosticCategory.Error)
.map(mapDiagnostic)
.filter((d): d is Diagnostic => Boolean(d));
if (syntax.length > 0) {
return {
ok: false,
error: {
type: "syntax_error",
message: `Code has ${syntax.length} syntax error(s): ${syntax[0].message} (line ${syntax[0].line})`,
diagnostics: syntax.slice(0, 10),
},
};
}
const violations = findViolations(code, language);
if (violations.length > 0) {
return {
ok: false,
violations,
error: {
type: "permission_denied",
reason: "import_not_allowed",
message: `Imports are not allowed; use the provided \`sdk\` binding instead (${violations.slice(0, 3).join("; ")})`,
},
};
}
return {
ok: true,
js: result.outputText,
moduleBase64: Buffer.from(result.outputText).toString("base64"),
};
}
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