Test script/build-bin's archive choice, hash check and refusal

The test runs the script with stub uname, ldd, curl, unzip and nix-shell
first on PATH, so it needs no network and no bun. The download and the
compile stay untested.

Model: opus-5-5

Makefile

@@ -26,10 +26,8 @@ check:
 build:
 	@script/build
 
-# Bundles the built dist/, so the binary reports the version script/build
-# stamped.
-build-bin: build
-	nix-shell -p bun --run "bun build dist/bin/quak.js --compile --outfile bin/quak"
+build-bin:
+	@script/build-bin
 
 install: build-bin
 	mkdir -p ~/bin

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 +70,29 @@ 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
+```
+
+`yarn link` also installs the `quak` command in yarn's global bin directory, and
+`yarn unlink` in the clone removes the link and the command.
+
+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";
@@ -135,10 +154,16 @@ requests. The "Library reference" below covers both.
 ## Running the backup from cron
 
 `quak backup` never prompts, so cron can run it. `make install` builds quak as
-one binary and copies it to `~/bin/quak`. Besides what Getting Started needs,
-`make install` needs `make` and [nix](https://nixos.org/download). It uses bun,
-a JavaScript runtime, to bundle the built `dist/` into one executable. It runs
-bun through `nix-shell -p bun`.
+one binary and copies it to `~/bin/quak`. It uses bun, a JavaScript runtime, to
+bundle the built `dist/` into one executable. Besides what Getting Started
+needs, `make install` needs `make`. On Linux it downloads bun from GitHub with
+`curl` and unpacks it with `unzip`. It checks the download against a SHA-256
+hash in the repo. On macOS it runs bun through `nix-shell -p bun`, so it needs
+[nix](https://nixos.org/download).
+
+On Linux systems that use the musl C library, such as Alpine, `make install`
+downloads bun's musl build. On Alpine, both that bun and `~/bin/quak` need the
+`libstdc++` and `libgcc` packages.
 
 Log in once with `~/bin/quak`, as the user the cron job will run as:
 
@@ -302,7 +327,7 @@ title, with unsafe characters replaced (see "File names from the server"). With
 original is kept in the cache as well.
 
 A file ID that no collection holds gives `File <id> not found`, and the exit
-status is 1. The option `--collection <id>` is accepted and ignored.
+status is 1.
 
 A live photo is a still image and a short video that Ente stores as one file.
 `get` writes both, each named after the title with its own extension, as Ente's
@@ -671,6 +696,9 @@ but letters and digits, or when it is longer than 16 characters.
 When the date or the time zone changes, the next run stores the original at its
 new path and leaves the old copy where it is.
 
+A file deleted in Ente keeps its original at its save path, and the JSON beside
+it. The next run removes its symlinks from the collection directories.
+
 The library gives the same path as `photo.savePath` and writes it with
 `photo.download()` (see "A photo's content").
 
@@ -1771,6 +1799,8 @@ standard. The others are additions to it.
   `package.json` declares (`main`, `types`, `bin`) were written, and make the
   command line executable.
 - `script/version`: print the version `script/build` stamps (see "Version").
+- `script/build-bin`: run `script/build`, then bundle the built `dist/` into one
+  binary, `bin/quak`, with bun (see "Running the backup from cron").
 - `script/test`: run the test suite, by building the `test` phase of the
   `Dockerfile`. Requires Docker.
 - `script/lint`: run eslint and a prettier check, by building the `lint` phase
@@ -1799,8 +1829,7 @@ The Makefile targets are:
 - `make build`: runs `script/build`.
 - `make docker`: runs `script/docker`.
 - `make hooks`: runs `script/install-precommit`.
-- `make build-bin`: bundles the built `dist/` into one binary, `bin/quak`. It
-  runs bun through `nix-shell -p bun`.
+- `make build-bin`: runs `script/build-bin`.
 - `make install`: runs `make build-bin` and copies the binary to `~/bin/quak`.
 - `make dev`: runs the TypeScript compiler in watch mode.
 - `make clean`: removes `dist/`, `coverage/`, `.vitest-cache/` and the
@@ -1908,9 +1937,11 @@ These apply to people and to coding agents alike.
     - container images by digest;
     - the nvm archive `script/bootstrap` downloads, and the Python packages
       `bin/clip-keyword-vectors` installs, by SHA-256 hash;
+    - bun's glibc and musl builds, which `script/build-bin` downloads on Linux,
+      by SHA-256 hash;
     - Node and yarn, when `script/bootstrap` installs them, by version.
 - Not pinned:
-    - bun, which `make build-bin` takes from `nix-shell -p bun`;
+    - bun on macOS, which `script/build-bin` takes from `nix-shell -p bun`;
     - `make` and `git`, which `script/bootstrap` installs from the system
       package manager when they are missing, as every `Dockerfile` stage does;
     - `bash` and `curl`, which `script/bootstrap` installs the same way when it

bin/quak.ts

@@ -123,7 +123,6 @@ program
     .description("Download and decrypt a single file")
     .argument("<fileID>", "File ID (from `quak files`)")
     .option("--out <path>", "Output file path")
-    .option("--collection <id>", "Accepted for compatibility; ignored")
     .action((fileID: string, opts: { out?: string }) =>
         run(getCommand(context(), fileID, opts)),
     );
@@ -133,7 +132,6 @@ program
     .description("Download and decrypt a thumbnail")
     .argument("<fileID>", "File ID (from `quak files`)")
     .option("--out <path>", "Output file path")
-    .option("--collection <id>", "Accepted for compatibility; ignored")
     .action((fileID: string, opts: { out?: string }) =>
         run(getThumbCommand(context(), fileID, opts)),
     );

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",

script/build-bin

@@ -0,0 +1,73 @@
+#!/bin/sh
+# script/build-bin: run script/build, then bundle the built dist/ into one
+# executable, bin/quak, which reports the version script/build stamped. Our own
+# extension to scripts-to-rule-them-all.
+#
+# bun compiles the binary from a copy of its own executable. On Linux, nix's
+# bun loads through a C library in the nix store, and so does a binary compiled
+# from it. nix-collect-garbage can delete that library, and the binary then no
+# longer starts. On Linux this script therefore compiles with bun's own release
+# build, which loads through the system's C library. It downloads that build
+# and checks it against the hash below before running it.
+set -eu
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
+
+# bun 1.3.13, 2026-11-11, and the SHA-256 of each release archive below. The
+# x86-64 archives are the baseline builds, which also run on CPUs without AVX2.
+# The musl archives are for Linux systems that use the musl C library, such as
+# Alpine.
+BUN_VERSION="1.3.13"
+BUN_LINUX_X64_BASELINE_SHA256="9d8a24292a7068090205daac0a5a223f5f69736f5287e37bf88d3b4031edc750"
+BUN_LINUX_X64_MUSL_BASELINE_SHA256="88ca7c7ad235b498f549eea2f770f434e9f0f5e9ba95168a2d3a1f235184c394"
+BUN_LINUX_AARCH64_SHA256="70bae41b3908b0a120e1e58c5c8af30e74afae3b8d11b0d3fdd8e787ddfb4b22"
+BUN_LINUX_AARCH64_MUSL_SHA256="5385e978107ce4934298d8d6afe9bfbb898683f6cc23e6753a0da60bc60c5b81"
+
+# compile_with_downloaded_bun <archive-name> <sha256>
+compile_with_downloaded_bun() {
+    tmp="$(mktemp -d)"
+    trap 'rm -rf "$tmp"' EXIT
+    curl -fsSL -o "$tmp/$1.zip" \
+        "https://github.com/oven-sh/bun/releases/download/bun-v$BUN_VERSION/$1.zip"
+    echo "$2  $tmp/$1.zip" | sha256sum -c -
+    unzip -q "$tmp/$1.zip" -d "$tmp"
+    "$tmp/$1/bun" build dist/bin/quak.js --compile --outfile bin/quak
+}
+
+main() {
+    cd "$ROOT"
+    "$ROOT/script/build"
+    platform="$(uname -s)-$(uname -m)"
+    # musl's ldd begins its version output with "musl libc"; glibc's does not.
+    if ldd --version 2>&1 | grep -q '^musl libc'; then
+        platform="$platform-musl"
+    fi
+    case "$platform" in
+        Linux-x86_64)
+            compile_with_downloaded_bun bun-linux-x64-baseline \
+                "$BUN_LINUX_X64_BASELINE_SHA256"
+            ;;
+        Linux-x86_64-musl)
+            compile_with_downloaded_bun bun-linux-x64-musl-baseline \
+                "$BUN_LINUX_X64_MUSL_BASELINE_SHA256"
+            ;;
+        Linux-aarch64)
+            compile_with_downloaded_bun bun-linux-aarch64 \
+                "$BUN_LINUX_AARCH64_SHA256"
+            ;;
+        Linux-aarch64-musl)
+            compile_with_downloaded_bun bun-linux-aarch64-musl \
+                "$BUN_LINUX_AARCH64_MUSL_SHA256"
+            ;;
+        Linux-*)
+            echo "build-bin: bun has no release build for Linux on $(uname -m)" >&2
+            exit 1
+            ;;
+        *)
+            nix-shell -p bun --run \
+                "bun build dist/bin/quak.js --compile --outfile bin/quak"
+            ;;
+    esac
+}
+
+main "$@"

src/api/client.ts

@@ -354,7 +354,13 @@ export class ApiClient {
         });
     }
 
-    async putFile(presignedURL: string, data: Uint8Array): Promise<void> {
+    // `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> {
         // 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
@@ -370,6 +376,7 @@ 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);
+            await api.putFile(url, ciphertext, md5);
             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]));
+        await client.putFile("https://s3.example/x", new Uint8Array([1]), "m");
         await client.putJSON("/c", {});
 
         for (const call of calls) {
@@ -825,7 +825,8 @@ describe("ApiClient timeouts", () => {
             [
                 "putFile",
                 () => new Response(null, { status: 200 }),
-                (c) => c.putFile("https://s3.example/x", new Uint8Array([1])),
+                (c) =>
+                    c.putFile("https://s3.example/x", new Uint8Array([1]), "m"),
             ],
             [
                 "getFileStream",
@@ -1049,7 +1050,7 @@ 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]))
+            .putFile("https://s3.example/obj", new Uint8Array([1, 2]), "m")
             .catch((e: unknown) => e);
 
         expect(err).toBeInstanceOf(ApiError);
@@ -1067,7 +1068,11 @@ describe("ApiClient error typing", () => {
         );
         const client = new ApiClient({ fetch, retry: noWait });
 
-        await client.putFile("https://s3.example/obj", new Uint8Array([1, 2]));
+        await client.putFile(
+            "https://s3.example/obj",
+            new Uint8Array([1, 2]),
+            "m",
+        );
         expect(calls).toHaveLength(2);
     });
 
@@ -1277,6 +1282,7 @@ 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

@@ -80,13 +80,20 @@ 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);
+        await client.putFile(
+            "https://s3.example.com/presigned?sig=abc",
+            data,
+            "md5base64==",
+        );
 
         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);
@@ -99,7 +106,11 @@ describe("ApiClient.putFile", () => {
         const client = new ApiClient({ fetch });
 
         await expect(
-            client.putFile("https://s3.example.com/bad", new Uint8Array(10)),
+            client.putFile(
+                "https://s3.example.com/bad",
+                new Uint8Array(10),
+                "md5base64==",
+            ),
         ).rejects.toThrow(/403/);
     });
 });

test/cli/bin.test.ts

@@ -1,8 +1,9 @@
 /**
  * Tests for the retry options `bin/quak.ts` loads the saved session with
  * (`quak backup` gets the unattended ones, every other command the default),
- * each with the callbacks that log its requests and retries, and for
- * `quak files` taking its collection ID as an optional argument.
+ * each with the callbacks that log its requests and retries, for `quak files`
+ * taking its collection ID as an optional argument, and for `quak get` and
+ * `quak get-thumb` refusing `--collection`.
  *
  * Each test runs `bin/quak.ts`, as the smoke test does, with its session loader
  * replaced by one that records the options it is given and reports no session,
@@ -105,3 +106,14 @@ describe("bin/quak.ts files", () => {
         expect(await quak("files", "7")).toMatch(/^Not logged in/);
     });
 });
+
+describe("bin/quak.ts get and get-thumb", () => {
+    it.each(["get", "get-thumb"])(
+        "%s refuses --collection as an unknown option",
+        async (command) => {
+            expect(await quak(command, "1", "--collection", "2")).toMatch(
+                /^error: unknown option '--collection'/,
+            );
+        },
+    );
+});

test/cli/commands.test.ts

@@ -569,14 +569,14 @@ describe("files", () => {
 });
 
 describe("get and get-thumb", () => {
-    it("get finds a file in any album without --collection", async () => {
+    it("get finds a file in any album", async () => {
         const out = join(root, "diagram.png");
         expect(await getCommand(context(), "200", { out })).toBe(0);
         expect(readFileSync(out)).toEqual(Buffer.alloc(7, 200));
         expect(stderr.text).toBe(`7 bytes -> ${out}\n`);
     });
 
-    it("get-thumb finds a file in any album without --collection", async () => {
+    it("get-thumb finds a file in any album", async () => {
         const out = join(root, "thumb.jpg");
         expect(await getThumbCommand(context(), "200", { out })).toBe(0);
         expect(readFileSync(out)).toEqual(Buffer.alloc(3, 200));

test/packaging/build-bin.test.ts

@@ -0,0 +1,180 @@
+// `script/build-bin` compiles `bin/quak`, the single binary that the README's
+// cron setup runs. bun compiles it from a copy of its own executable, so the
+// binary loads through the same C library as the bun that built it. nix's bun
+// loads through a C library in the nix store, which garbage collection can
+// delete. On Linux the script therefore downloads bun's own release build,
+// which loads through the system's C library.
+//
+// What the script promises, and why each test matters:
+//
+// - On Linux, each machine and C library that bun publishes a build for gets
+//   its own archive: x86-64 or arm64, with glibc or with musl, as on Alpine. A
+//   bun built for another machine or C library does not start, and
+//   `make install` fails.
+// - The archive's SHA-256 must match the one in the script before anything in
+//   the archive runs. Without that check, a tampered download would build the
+//   binary that cron runs.
+// - Linux on any other machine stops with an error. Building there with nix's
+//   bun would bring back the dependency on the nix store.
+// - Other systems, such as macOS, compile with nix's bun as before, and
+//   download nothing.
+//
+// Each test copies the script into a fresh directory, which the script then
+// treats as the checkout, and runs it there. Stubs first on PATH stand in for
+// `uname`, `ldd`, `curl`, `unzip` and `nix-shell`, so no test downloads
+// anything or runs a real bun.
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+import { spawnSync } from "node:child_process";
+import {
+    chmodSync,
+    copyFileSync,
+    existsSync,
+    mkdirSync,
+    mkdtempSync,
+    readFileSync,
+    rmSync,
+    writeFileSync,
+} from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const repoRoot = fileURLToPath(new URL("../../", import.meta.url));
+
+// The stubs, keyed by the command each replaces. `uname` and `ldd` describe the
+// system that runBuildBin passes in the environment. `curl`, `unzip` and
+// `nix-shell` write the arguments they were given, one per line, to a file
+// named after the command in $STUB_LOG_DIR, which also shows that they ran.
+const stubs: Record<string, string> = {
+    uname: `
+        case "$1" in
+            -s) echo "$STUB_UNAME_S" ;;
+            -m) echo "$STUB_UNAME_M" ;;
+        esac`,
+    // The script looks only at the start of the line: "musl libc" or not.
+    ldd: `
+        if [ "$STUB_LIBC" = musl ]; then
+            echo "musl libc (x86_64)"
+        else
+            echo "ldd (GNU libc) 2.36"
+        fi`,
+    // Writes a file that is not the archive to the path after -o.
+    curl: `
+        printf '%s\\n' "$@" > "$STUB_LOG_DIR/curl"
+        while [ $# -gt 1 ]; do
+            if [ "$1" = -o ]; then echo "not the archive" > "$2"; fi
+            shift
+        done`,
+    // Unpacks a stub bun where the real archive puts bun: in a directory named
+    // after the archive, inside the directory after -d. That bun writes
+    // bin/quak, as a real compile would.
+    unzip: `
+        printf '%s\\n' "$@" > "$STUB_LOG_DIR/unzip"
+        for arg in "$@"; do
+            case "$arg" in *.zip) archive="$arg" ;; esac
+            if [ "$previous" = -d ]; then directory="$arg"; fi
+            previous="$arg"
+        done
+        bun="$directory/$(basename "$archive" .zip)/bun"
+        mkdir -p "$(dirname "$bun")"
+        echo '#!/bin/sh' > "$bun"
+        echo 'mkdir -p bin && echo binary > bin/quak' >> "$bun"
+        chmod +x "$bun"`,
+    "nix-shell": `
+        printf '%s\\n' "$@" > "$STUB_LOG_DIR/nix-shell"`,
+};
+
+let checkout = "";
+
+const writeScript = (path: string, body: string): void => {
+    writeFileSync(path, `#!/bin/sh\n${body}\n`);
+    chmodSync(path, 0o755);
+};
+
+// A checkout holding the script, a stub script/build that does nothing, the
+// stubs, and the directory they log to.
+beforeEach(() => {
+    checkout = mkdtempSync(join(tmpdir(), "quak-build-bin-"));
+    mkdirSync(join(checkout, "script"));
+    copyFileSync(
+        join(repoRoot, "script/build-bin"),
+        join(checkout, "script/build-bin"),
+    );
+    chmodSync(join(checkout, "script/build-bin"), 0o755);
+    writeScript(join(checkout, "script/build"), "exit 0");
+    mkdirSync(join(checkout, "stubs"));
+    for (const [command, body] of Object.entries(stubs)) {
+        writeScript(join(checkout, "stubs", command), body);
+    }
+    mkdirSync(join(checkout, "log"));
+});
+
+afterEach(() => {
+    rmSync(checkout, { recursive: true, force: true });
+});
+
+// Runs the script with nothing in its environment but the stubs' settings and a
+// PATH that finds the stubs first.
+const runBuildBin = (system: string, machine: string, libc = "glibc") =>
+    spawnSync(join(checkout, "script/build-bin"), {
+        cwd: checkout,
+        encoding: "utf-8",
+        env: {
+            PATH: `${join(checkout, "stubs")}:${process.env.PATH}`,
+            STUB_UNAME_S: system,
+            STUB_UNAME_M: machine,
+            STUB_LIBC: libc,
+            STUB_LOG_DIR: join(checkout, "log"),
+        },
+    });
+
+const ran = (command: string): boolean =>
+    existsSync(join(checkout, "log", command));
+
+const argumentsOf = (command: string): string[] =>
+    readFileSync(join(checkout, "log", command), "utf-8")
+        .trimEnd()
+        .split("\n");
+
+describe("script/build-bin", () => {
+    // The stub curl writes a file that is not the archive, so the hash check
+    // must stop the script before unzip runs. A script without the check would
+    // run unzip, and the stub bun it unpacks would write bin/quak.
+    it.each([
+        ["x86_64", "glibc", "bun-linux-x64-baseline.zip"],
+        ["x86_64", "musl", "bun-linux-x64-musl-baseline.zip"],
+        ["aarch64", "glibc", "bun-linux-aarch64.zip"],
+        ["aarch64", "musl", "bun-linux-aarch64-musl.zip"],
+    ])(
+        "on Linux %s with %s, downloads %s and stops when its hash does not match",
+        (machine, libc, archive) => {
+            const result = runBuildBin("Linux", machine, libc);
+            expect(argumentsOf("curl")).toContain(
+                "https://github.com/oven-sh/bun/releases/download/bun-v1.3.13/" +
+                    archive,
+            );
+            expect(result.status).not.toBe(0);
+            expect(ran("unzip")).toBe(false);
+            expect(existsSync(join(checkout, "bin/quak"))).toBe(false);
+        },
+    );
+
+    it("stops on a Linux machine that bun publishes no build for", () => {
+        const result = runBuildBin("Linux", "riscv64");
+        expect(result.status).not.toBe(0);
+        expect(ran("curl")).toBe(false);
+        expect(ran("nix-shell")).toBe(false);
+    });
+
+    it("compiles with nix's bun on macOS", () => {
+        const result = runBuildBin("Darwin", "arm64");
+        expect(result.status).toBe(0);
+        expect(ran("curl")).toBe(false);
+        expect(argumentsOf("nix-shell")).toEqual([
+            "-p",
+            "bun",
+            "--run",
+            "bun build dist/bin/quak.js --compile --outfile bin/quak",
+        ]);
+    });
+});

test/thumbnails/thumbnails.test.ts

@@ -273,6 +273,7 @@ const buildThumbMock = async (opts?: {
 
 const buildThumbFetch = (m: ThumbMockState) => {
     let srpServer: SrpServer;
+    let signedMD5: string | undefined;
 
     return (async (
         input: RequestInfo | URL,
@@ -365,8 +366,9 @@ const buildThumbFetch = (m: ThumbMockState) => {
             return new Response("not found", { status: 404 });
         }
 
-        // Upload URL minting
+        // Upload URL minting. The real server signs the MD5 into the URL.
         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",
@@ -375,6 +377,11 @@ 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) {