99 lines
2.9 KiB
TypeScript
99 lines
2.9 KiB
TypeScript
import type { SysCallMapping } from "../system.ts";
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import { mime, path } from "../deps.ts";
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import { base64DecodeDataUrl, base64Encode } from "../asset_bundle/base64.ts";
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import { FileMeta } from "../../common/types.ts";
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export default function fileSystemSyscalls(root = "/"): SysCallMapping {
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function resolvedPath(p: string): string {
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p = path.resolve(root, p);
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if (!p.startsWith(root)) {
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throw Error("Path outside root, not allowed");
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}
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return p;
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}
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return {
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"fs.readFile": async (
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_ctx,
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filePath: string,
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encoding: "utf8" | "dataurl" = "utf8",
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): Promise<string> => {
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const p = resolvedPath(filePath);
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let text = "";
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if (encoding === "utf8") {
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text = await Deno.readTextFile(p);
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} else {
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text = `data:application/octet-stream,${
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base64Encode(await Deno.readFile(p))
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}`;
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}
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return text;
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},
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"fs.getFileMeta": async (_ctx, filePath: string): Promise<FileMeta> => {
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const p = resolvedPath(filePath);
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const s = await Deno.stat(p);
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return {
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name: filePath,
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lastModified: s.mtime!.getTime(),
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contentType: mime.getType(filePath) || "application/octet-stream",
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size: s.size,
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perm: "rw",
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};
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},
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"fs.writeFile": async (
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_ctx,
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filePath: string,
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text: string,
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encoding: "utf8" | "dataurl" = "utf8",
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): Promise<FileMeta> => {
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const p = resolvedPath(filePath);
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await Deno.mkdir(path.dirname(p), { recursive: true });
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if (encoding === "utf8") {
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await Deno.writeTextFile(p, text);
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} else {
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await Deno.writeFile(p, base64DecodeDataUrl(text));
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}
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const s = await Deno.stat(p);
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return {
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name: filePath,
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lastModified: s.mtime!.getTime(),
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contentType: mime.getType(filePath) || "application/octet-stream",
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size: s.size,
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perm: "rw",
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};
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},
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"fs.deleteFile": async (_ctx, filePath: string): Promise<void> => {
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await Deno.remove(resolvedPath(filePath));
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},
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"fs.listFiles": async (
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_ctx,
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dirPath: string,
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recursive: boolean,
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): Promise<FileMeta[]> => {
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dirPath = resolvedPath(dirPath);
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const allFiles: FileMeta[] = [];
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async function walkPath(dir: string) {
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const files = await Deno.readDir(dir);
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for await (const file of files) {
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const fullPath = path.join(dir, file.name);
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const s = await Deno.stat(fullPath);
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if (s.isDirectory && recursive) {
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await walkPath(fullPath);
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} else {
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allFiles.push({
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name: fullPath.substring(dirPath.length + 1),
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lastModified: s.mtime!.getTime(),
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contentType: mime.getType(fullPath) || "application/octet-stream",
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size: s.size,
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perm: "rw",
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});
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}
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}
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}
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await walkPath(dirPath);
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return allFiles;
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},
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};
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}
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