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Refactor saveJson to use path.resolve and validate path #74

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Refactor saveJson to use path.resolve and validate path #74

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6 changes: 5 additions & 1 deletion src/server/storage/filesystem.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,11 @@ export class FilesystemStorage {
}

async saveJson(relativePath: string, data: unknown): Promise<string> {
const target = path.join(this.baseDir, relativePath);
const target = path.resolve(this.baseDir, relativePath);

if (!target.startsWith(path.resolve(this.baseDir))) {
throw new Error("Invalid path");
}
await fs.mkdir(path.dirname(target), { recursive: true });
await fs.writeFile(target, JSON.stringify(data, null, 2), "utf8");
return target;
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