quak login --server: log in to a self-hosted Ente server (closes #243)

`quak login` takes the server's API address from `--server` or
`QUAK_SERVER`, refusing anything that is not an http or https URL. The
client's snapshot now keeps a non-default `apiOrigin`, so the session
file names the server and every later command uses it. A snapshot's
`apiOrigin` wins over the one in `fromJSON`'s `apiOptions`, since the
token belongs to that server.

Model: opus-5-5

test/cli/commands.test.ts

@@ -328,6 +328,7 @@ describe("login", () => {
         prompts = [];
         vi.stubEnv("QUAK_EMAIL", "cli@example.com");
         vi.stubEnv("QUAK_PASSWORD", "hunter2");
+        vi.stubEnv("QUAK_SERVER", undefined);
     });
 
     afterEach(() => {
@@ -340,12 +341,14 @@ describe("login", () => {
             calls.push(opts);
             return loggedIn;
         });
-        expect(await loginCommand(ctx)).toBe(0);
+        expect(await loginCommand(ctx, {})).toBe(0);
 
         expect(prompts).toEqual([]);
         expect(calls).toHaveLength(1);
         expect(calls[0]!.email).toBe("cli@example.com");
         expect(calls[0]!.password).toBe("hunter2");
+        // No server named: the client uses Ente's hosted service.
+        expect(calls[0]!.apiOptions).toBeUndefined();
         const path = join(ctx.sessionDir, "session.json");
         expect(stderr.text).toBe(
             "Authenticating...\n" +
@@ -356,7 +359,7 @@ describe("login", () => {
 
     it("saves the session with mode 0600 in a directory with mode 0700", async () => {
         const ctx = loginContext(async () => loggedIn);
-        expect(await loginCommand(ctx)).toBe(0);
+        expect(await loginCommand(ctx, {})).toBe(0);
 
         expect(statSync(ctx.sessionDir).mode & 0o777).toBe(0o700);
         const path = join(ctx.sessionDir, "session.json");
@@ -370,7 +373,7 @@ describe("login", () => {
             code = await opts.totp!();
             return loggedIn;
         });
-        expect(await loginCommand(ctx)).toBe(0);
+        expect(await loginCommand(ctx, {})).toBe(0);
 
         expect(prompts).toEqual(["TOTP code: "]);
         expect(code).toBe("123456");
@@ -380,13 +383,68 @@ describe("login", () => {
         const ctx = loginContext(async () => {
             throw new Error("HTTP 401 from server");
         });
-        expect(await loginCommand(ctx)).toBe(1);
+        expect(await loginCommand(ctx, {})).toBe(1);
 
         expect(stderr.text).toBe(
             "Authenticating...\nLogin failed: HTTP 401 from server\n",
         );
         expect(existsSync(join(ctx.sessionDir, "session.json"))).toBe(false);
     });
+
+    it("logs in to the server --server names, ahead of QUAK_SERVER", async () => {
+        vi.stubEnv("QUAK_SERVER", "https://other.example.com");
+        const calls: LoginOptions[] = [];
+        const ctx = loginContext(async (opts) => {
+            calls.push(opts);
+            return loggedIn;
+        });
+        expect(
+            await loginCommand(ctx, { server: "https://ente.example.com" }),
+        ).toBe(0);
+
+        expect(calls[0]!.apiOptions).toEqual({
+            apiOrigin: "https://ente.example.com",
+        });
+    });
+
+    it("logs in to the server QUAK_SERVER names without --server", async () => {
+        vi.stubEnv("QUAK_SERVER", "http://192.0.2.1:8080/ente");
+        const calls: LoginOptions[] = [];
+        const ctx = loginContext(async (opts) => {
+            calls.push(opts);
+            return loggedIn;
+        });
+        expect(await loginCommand(ctx, {})).toBe(0);
+
+        expect(calls[0]!.apiOptions).toEqual({
+            apiOrigin: "http://192.0.2.1:8080/ente",
+        });
+    });
+
+    it.each([
+        "",
+        "ente.example.com",
+        "ftp://ente.example.com",
+        "https://ente.example.com/?region=eu",
+        "https://ente.example.com/#top",
+    ])(
+        "refuses the server address %j before asking for anything",
+        async (server) => {
+            const ctx = loginContext(async () => {
+                throw new Error("login must not be called");
+            });
+            expect(await loginCommand(ctx, { server })).toBe(1);
+
+            expect(prompts).toEqual([]);
+            expect(stderr.text).toBe(
+                `Invalid server address "${server}": it must be an http or ` +
+                    `https URL with no query or fragment\n`,
+            );
+            expect(existsSync(join(ctx.sessionDir, "session.json"))).toBe(
+                false,
+            );
+        },
+    );
 });
 
 // These use a real client read from the session file, over a fake API that
@@ -1851,6 +1909,47 @@ describe("an account with many albums", () => {
         expect(existsSync(join(root, "cache", "metadata.json"))).toBe(false);
     });
 
+    // A self-hosted server serves downloads under its own address, at
+    // `/files/download/<id>`, so no request goes to Ente's hosted service.
+    it("login --server saves the server, and a later get sends every request to it", async () => {
+        vi.stubEnv("QUAK_EMAIL", "many@example.com");
+        vi.stubEnv("QUAK_PASSWORD", PASSWORD);
+        vi.stubEnv("QUAK_SERVER", undefined);
+        const hosts = new Set<string>();
+        const fetch = (async (input: RequestInfo | URL, init?: RequestInit) => {
+            hosts.add(
+                new URL(input instanceof Request ? input.url : input).host,
+            );
+            return server(input, init);
+        }) as typeof globalThis.fetch;
+        const ctx: CliContext = {
+            ...context(),
+            login: (opts) =>
+                Client.login({
+                    ...opts,
+                    apiOptions: { ...opts.apiOptions, fetch },
+                }),
+            loadSession: (path) => loadSession(path, { fetch }),
+        };
+        const out = join(root, "photo.jpg");
+        try {
+            const opts = { server: "https://ente.example.com" };
+            expect(await loginCommand(ctx, opts)).toBe(0);
+            requests.length = 0;
+            expect(await getCommand(ctx, "200", { out })).toBe(0);
+        } finally {
+            vi.unstubAllEnvs();
+        }
+
+        const path = join(ctx.sessionDir, "session.json");
+        expect(JSON.parse(readFileSync(path, "utf-8")).apiOrigin).toBe(
+            "https://ente.example.com",
+        );
+        expect(readFileSync(out, "utf-8")).toBe("photo-2.jpg");
+        expect(requests.at(-1)).toBe("/files/download/200");
+        expect([...hosts]).toEqual(["ente.example.com"]);
+    });
+
     // `files` first fills the cache, so `get` waits for a refresh. No album has
     // changed since, so the refresh asks for no album's files.
     it("get on a cache that holds the account asks for no unchanged album's files, also for a photo in no album", async () => {