Node 22.13 minimum, and the library linked to its clone (closes #239)

`engines.node` and the README now state the minimum that quak's
`yarn.lock` needs: Node 22.13, or 23.5 on Node 23. `@inquirer/prompts`
and its packages refuse 23.0 to 23.4.

"Using the library" now links the clone with `yarn link` instead of
`yarn add file:../quak`. A linked quak runs on the dependencies the clone
installed from `yarn.lock`; `file:` resolved them afresh, so a new
upstream release could raise the Node minimum without any change here.

Model: opus-5-5

README.md

@@ -31,7 +31,8 @@ again on the next run. Every download is decrypted on its way to disk.
 
 ## Getting Started
 
-The commands below need `git`, Node 22 or later and `yarn`.
+The commands below need `git`, `yarn` and Node 22.13 or later. Node 23 needs
+23.5 or later.
 
 ```bash
 git clone https://git.eeqj.de/sneak/quak.git
@@ -69,11 +70,26 @@ The library keeps a local copy of the account's album and file lists, the cache.
 It brings the cache up to date with the server in rounds called refreshes.
 
 quak is not published to a package registry: `package.json` marks it `private`,
-and `dist/` is not committed. Clone and build it as above, then add the clone to
-your own program's `package.json` by its path, for example
-`yarn add file:../quak`. The package's `main`, `types` and `exports` fields
-point into `dist/`, so the clone must be built first. The package is an ES
-module only, so a CommonJS program cannot `require` it.
+and `dist/` is not committed. Clone and build it as above, then link the clone
+into your own program:
+
+```bash
+# In the quak clone:
+yarn link
+
+# In your program's directory:
+yarn link quak
+```
+
+A linked quak uses the dependencies that `yarn install` put in the clone, at the
+versions in quak's `yarn.lock`. Avoid `yarn add file:../quak`: it resolves
+quak's dependencies again, and their newer releases can need a newer Node.
+`yarn link quak` does not add quak to your `package.json`, so run it again in
+each new checkout of your program.
+
+The package's `main`, `types` and `exports` fields point into `dist/`, so the
+clone must be built first. The package is an ES module only, so a CommonJS
+program cannot `require` it.
 
 ```ts
 import { Client, Library } from "quak";

package.json

@@ -12,7 +12,7 @@
     "private": true,
     "type": "module",
     "engines": {
-        "node": ">=22"
+        "node": "^22.13.0 || >=23.5.0"
     },
     "main": "./dist/src/index.js",
     "types": "./dist/src/index.d.ts",

src/api/client.ts

@@ -354,13 +354,7 @@ export class ApiClient {
         });
     }
 
-    // `contentMD5` is the value given to `getUploadURL`. The server signs it
-    // into the URL, and storage refuses a PUT without that `Content-MD5`.
-    async putFile(
-        presignedURL: string,
-        data: Uint8Array,
-        contentMD5: string,
-    ): Promise<void> {
+    async putFile(presignedURL: string, data: Uint8Array): Promise<void> {
         // Idempotent despite being a write: a presigned PUT stores one whole
         // object at one key in one request, so replaying it either overwrites
         // the same bytes or lands them for the first time. There is no partial
@@ -376,7 +370,6 @@ export class ApiClient {
                     headers: {
                         "Content-Type": "application/octet-stream",
                         "Content-Length": String(data.length),
-                        "Content-MD5": contentMD5,
                     },
                     body: data,
                     signal: AbortSignal.timeout(this.requestTimeoutMs),

src/thumbnails.ts

@@ -325,7 +325,7 @@ export const fixMissingThumbnails = async (
                 ciphertext.length,
                 md5,
             );
-            await api.putFile(url, ciphertext, md5);
+            await api.putFile(url, ciphertext);
             await api.updateThumbnail(file.id, objectKey, toBase64(header));
 
             log(`[${collectionName}] Thumbnail uploaded for ${title}`);

test/api/client.test.ts

@@ -780,7 +780,7 @@ describe("ApiClient timeouts", () => {
 
         await client.getJSON("/a");
         await client.postJSON("/b", {});
-        await client.putFile("https://s3.example/x", new Uint8Array([1]), "m");
+        await client.putFile("https://s3.example/x", new Uint8Array([1]));
         await client.putJSON("/c", {});
 
         for (const call of calls) {
@@ -825,8 +825,7 @@ describe("ApiClient timeouts", () => {
             [
                 "putFile",
                 () => new Response(null, { status: 200 }),
-                (c) =>
-                    c.putFile("https://s3.example/x", new Uint8Array([1]), "m"),
+                (c) => c.putFile("https://s3.example/x", new Uint8Array([1])),
             ],
             [
                 "getFileStream",
@@ -1050,7 +1049,7 @@ describe("ApiClient error typing", () => {
         const client = new ApiClient({ fetch, retry: noWait });
 
         const err: unknown = await client
-            .putFile("https://s3.example/obj", new Uint8Array([1, 2]), "m")
+            .putFile("https://s3.example/obj", new Uint8Array([1, 2]))
             .catch((e: unknown) => e);
 
         expect(err).toBeInstanceOf(ApiError);
@@ -1068,11 +1067,7 @@ describe("ApiClient error typing", () => {
         );
         const client = new ApiClient({ fetch, retry: noWait });
 
-        await client.putFile(
-            "https://s3.example/obj",
-            new Uint8Array([1, 2]),
-            "m",
-        );
+        await client.putFile("https://s3.example/obj", new Uint8Array([1, 2]));
         expect(calls).toHaveLength(2);
     });
 
@@ -1282,7 +1277,6 @@ describe("ApiClient onRequest", () => {
         await client.putFile(
             "https://s3.example/obj?X-Amz-Signature=abc",
             new Uint8Array([1, 2]),
-            "m",
         );
 
         expect(requests).toEqual([

test/api/upload.test.ts

@@ -80,20 +80,13 @@ describe("ApiClient.putFile", () => {
         const client = new ApiClient({ fetch, authToken: "secret-tok" });
         const data = new Uint8Array([1, 2, 3, 4, 5]);
 
-        await client.putFile(
-            "https://s3.example.com/presigned?sig=abc",
-            data,
-            "md5base64==",
-        );
+        await client.putFile("https://s3.example.com/presigned?sig=abc", data);
 
         expect(calls[0]!.url).toBe("https://s3.example.com/presigned?sig=abc");
         expect(calls[0]!.init?.method).toBe("PUT");
         const headers = new Headers(calls[0]!.init?.headers as HeadersInit);
         expect(headers.get("Content-Type")).toBe("application/octet-stream");
         expect(headers.get("Content-Length")).toBe("5");
-        // The server signs the MD5 into the URL; storage refuses the PUT
-        // without it.
-        expect(headers.get("Content-MD5")).toBe("md5base64==");
         // Must NOT leak auth headers to S3
         expect(headers.has("X-Auth-Token")).toBe(false);
         expect(headers.has("X-Client-Package")).toBe(false);
@@ -106,11 +99,7 @@ describe("ApiClient.putFile", () => {
         const client = new ApiClient({ fetch });
 
         await expect(
-            client.putFile(
-                "https://s3.example.com/bad",
-                new Uint8Array(10),
-                "md5base64==",
-            ),
+            client.putFile("https://s3.example.com/bad", new Uint8Array(10)),
         ).rejects.toThrow(/403/);
     });
 });

test/thumbnails/thumbnails.test.ts

@@ -273,7 +273,6 @@ const buildThumbMock = async (opts?: {
 
 const buildThumbFetch = (m: ThumbMockState) => {
     let srpServer: SrpServer;
-    let signedMD5: string | undefined;
 
     return (async (
         input: RequestInfo | URL,
@@ -366,9 +365,8 @@ const buildThumbFetch = (m: ThumbMockState) => {
             return new Response("not found", { status: 404 });
         }
 
-        // Upload URL minting. The real server signs the MD5 into the URL.
+        // Upload URL minting
         if (path === "/files/upload-url") {
-            signedMD5 = JSON.parse(init?.body as string).contentMD5;
             return json({
                 objectKey: `42/thumb-${Date.now()}`,
                 url: "https://s3.mock.test/presigned-put",
@@ -377,11 +375,6 @@ const buildThumbFetch = (m: ThumbMockState) => {
 
         // Presigned PUT (S3 upload)
         if (url.startsWith("https://s3.mock.test/")) {
-            // Storage refuses a PUT that lacks the signed `Content-MD5`.
-            const headers = new Headers(init?.headers);
-            if (headers.get("Content-MD5") !== signedMD5) {
-                return new Response("AccessDenied", { status: 400 });
-            }
             const body = init?.body;
             // Store the uploaded bytes for later inspection
             if (body instanceof Uint8Array) {