import { readFileSync, accessSync, constants } from "fs";
import { basename } from "path";
import type { FileInput } from "../types.js";
/**
* 将文件输入转换为 File 对象
* 支持从文件路径读取或从 base64 解码
*/
export async function convertToFiles(fileInputs: FileInput[]): Promise<File[]> {
return Promise.all(
fileInputs.map(async (input) => {
if (input.path) {
// 从路径读取文件
validateFilePath(input.path);
const buffer = readFileSync(input.path);
const filename = input.filename || basename(input.path);
return new File([buffer], filename);
} else if (input.base64) {
// 从 base64 解码
if (!input.filename) {
throw new Error(
"filename is required when using base64 file input"
);
}
const buffer = Buffer.from(input.base64, "base64");
const options = input.mimeType ? { type: input.mimeType } : undefined;
return new File([buffer], input.filename, options);
}
throw new Error(
"File input must have either 'path' or 'base64' property"
);
})
);
}
/**
* 验证文件路径是否可读
*/
function validateFilePath(filePath: string): void {
try {
accessSync(filePath, constants.R_OK);
} catch (error) {
throw new Error(`Cannot read file at path: ${filePath}`);
}
}
