refactor(scripts): pin the draw.io release in one json file and share the zip reader

2026-10-12 04:29:51 +08:00 · 2026-10-11 20:56:07 +09:00
parent 1aa8abcd6e
commit f89d23880e
3 changed files with 81 additions and 50 deletions
@@ -0,0 +1,67 @@
+/**
+ * Shared by the two draw.io fetch scripts (the web app's scripts/fetch-drawio.mjs
+ * and packages/mcp-server/scripts/fetch-drawio.mjs): the pinned release and a
+ * minimal reader for its draw.war zip file, so no extra dependency is needed.
+ */
+import crypto from "node:crypto"
+import fs from "node:fs"
+import path from "node:path"
+import { fileURLToPath } from "node:url"
+import zlib from "node:zlib"
+
+// Pinned because the UI relies on draw.io internals; bump deliberately. The
+// web app and the MCP server embed the same release.
+const VERSION_FILE = path.join(
+    path.dirname(fileURLToPath(import.meta.url)),
+    "../packages/mcp-server/src/drawio-version.json",
+)
+
+/** { version, sha256, downloadUrl } of the pinned draw.war */
+export function readDrawioVersion() {
+    return JSON.parse(fs.readFileSync(VERSION_FILE, "utf8"))
+}
+
+export function sha256(buf) {
+    return crypto.createHash("sha256").update(buf).digest("hex")
+}
+
+// Minimal zip reader: finds the central directory and inflates each entry
+export function* readZipEntries(buf) {
+    const EOCD_SIG = 0x06054b50
+    let eocd = -1
+    for (let i = buf.length - 22; i >= Math.max(0, buf.length - 65557); i--) {
+        if (buf.readUInt32LE(i) === EOCD_SIG) {
+            eocd = i
+            break
+        }
+    }
+    if (eocd < 0) throw new Error("Not a zip file (end record not found)")
+
+    const count = buf.readUInt16LE(eocd + 10)
+    let offset = buf.readUInt32LE(eocd + 16)
+
+    for (let n = 0; n < count; n++) {
+        if (buf.readUInt32LE(offset) !== 0x02014b50) {
+            throw new Error("Corrupt zip central directory")
+        }
+        const method = buf.readUInt16LE(offset + 10)
+        const compressedSize = buf.readUInt32LE(offset + 20)
+        const nameLength = buf.readUInt16LE(offset + 28)
+        const extraLength = buf.readUInt16LE(offset + 30)
+        const commentLength = buf.readUInt16LE(offset + 32)
+        const localOffset = buf.readUInt32LE(offset + 42)
+        const name = buf.toString("utf8", offset + 46, offset + 46 + nameLength)
+        offset += 46 + nameLength + extraLength + commentLength
+
+        const localNameLength = buf.readUInt16LE(localOffset + 26)
+        const localExtraLength = buf.readUInt16LE(localOffset + 28)
+        const start = localOffset + 30 + localNameLength + localExtraLength
+        const raw = buf.subarray(start, start + compressedSize)
+
+        if (name.endsWith("/")) continue
+        if (method !== 0 && method !== 8) {
+            throw new Error(`Unsupported zip compression ${method} (${name})`)
+        }
+        yield { name, data: method === 8 ? zlib.inflateRawSync(raw) : raw }
+    }
+}