feat: add plugin packing, signing, pinned trust and tmxplug bundling

packages/plugin-sdk/cli/lib/tmxplug.mjs

@@ -0,0 +1,106 @@
+import fs from "node:fs";
+import path from "node:path";
+import zlib from "node:zlib";
+
+/** What a .tmxplug holds, in the order the spec lists it. */
+export const TMXPLUG_CONTENTS = [
+  "manifest.json",
+  "dist",
+  "locales",
+  "migrations",
+  "README.md",
+  "CHANGELOG.md",
+  "icon.svg",
+];
+
+const BLOCK = 512;
+
+/**
+ * Every file under the given top-level entries, as sorted posix paths.
+ * Directories are implied by their files, so none get their own entry.
+ */
+export function collectFiles(cwd, entries = TMXPLUG_CONTENTS) {
+  const files = [];
+  const walk = (rel) => {
+    const full = path.join(cwd, rel);
+    const stat = fs.lstatSync(full);
+    if (stat.isSymbolicLink()) {
+      throw new Error(`${rel} is a symlink; a .tmxplug holds plain files only`);
+    }
+    if (stat.isDirectory()) {
+      for (const child of fs.readdirSync(full)) {
+        walk(path.posix.join(rel, child));
+      }
+    } else if (stat.isFile()) {
+      files.push(rel);
+    }
+  };
+  for (const entry of entries) {
+    if (fs.existsSync(path.join(cwd, entry))) walk(entry);
+  }
+  return files.sort((a, b) => (a < b ? -1 : a > b ? 1 : 0));
+}
+
+function writeString(buf, offset, length, value) {
+  const bytes = Buffer.from(value, "utf8");
+  if (bytes.length > length) throw new Error(`"${value}" is too long`);
+  bytes.copy(buf, offset);
+}
+
+function writeOctal(buf, offset, length, value) {
+  writeString(buf, offset, length, value.toString(8).padStart(length - 1, "0"));
+}
+
+function splitName(name) {
+  if (Buffer.byteLength(name) <= 100) return { name, prefix: "" };
+  for (let i = name.length - 1; i > 0; i--) {
+    if (name[i] !== "/") continue;
+    const prefix = name.slice(0, i);
+    const rest = name.slice(i + 1);
+    if (Buffer.byteLength(prefix) <= 155 && Buffer.byteLength(rest) <= 100) {
+      return { name: rest, prefix };
+    }
+  }
+  throw new Error(`${name} is too long for a .tmxplug entry`);
+}
+
+function header(name, size) {
+  const buf = Buffer.alloc(BLOCK);
+  const split = splitName(name);
+  writeString(buf, 0, 100, split.name);
+  writeOctal(buf, 100, 8, 0o644);
+  writeOctal(buf, 108, 8, 0);
+  writeOctal(buf, 116, 8, 0);
+  writeOctal(buf, 124, 12, size);
+  writeOctal(buf, 136, 12, 0);
+  buf.fill(0x20, 148, 156);
+  buf[156] = 0x30;
+  writeString(buf, 257, 6, "ustar");
+  writeString(buf, 263, 2, "00");
+  writeString(buf, 345, 155, split.prefix);
+  let sum = 0;
+  for (const byte of buf) sum += byte;
+  writeString(buf, 148, 8, sum.toString(8).padStart(6, "0") + "\0 ");
+  return buf;
+}
+
+/**
+ * A gzipped ustar archive that depends only on file names and contents:
+ * fixed mode, owner and mtime, sorted entries, and a gzip header with no
+ * timestamp and a fixed OS byte (Node on Windows writes a different one).
+ * Rebuilding from the same tag gives the same sha256 on any machine.
+ */
+export function createTmxplug(cwd, files) {
+  const parts = [];
+  for (const rel of files) {
+    const data = fs.readFileSync(path.join(cwd, rel));
+    parts.push(header(rel, data.length), data);
+    const pad = (BLOCK - (data.length % BLOCK)) % BLOCK;
+    if (pad) parts.push(Buffer.alloc(pad));
+  }
+  parts.push(Buffer.alloc(BLOCK * 2));
+  const gz = zlib.gzipSync(Buffer.concat(parts), { level: 9 });
+  gz.writeUInt32LE(0, 4);
+  gz[9] = 0x03;
+  return gz;
+}