[WIP] Add user agent with package version for hub calls

packages/hub/src/consts.ts

@@ -1 +1,3 @@
 export const HUB_URL = "https://huggingface.co";
+export const VERSION = "2.1.0";
+export const USER_AGENT = `@huggingface/hub/${VERSION}`;

packages/hub/src/index.ts

@@ -1,4 +1,7 @@
 export * from "./lib";
+export * from "./utils";
+export { USER_AGENT, VERSION } from "./consts";
+
 // Typescript 5 will add 'export type *'
 export type {
 	AccessToken,

packages/hub/src/utils/createFetch.spec.ts

@@ -0,0 +1,93 @@
+import { describe, it, expect, vi } from "vitest";
+import { createFetch } from "./createFetch";
+import { USER_AGENT } from "../consts";
+
+describe("createFetch", () => {
+  it("should add user-agent header to fetch requests", async () => {
+    // Create a mock fetch function
+    const mockFetch = vi.fn().mockResolvedValue({
+      ok: true,
+    });
+
+    // Create a wrapped fetch with our utility
+    const wrappedFetch = createFetch(mockFetch);
+
+    // Call the wrapped fetch
+    const url = "https://huggingface.co/api/test";
+    await wrappedFetch(url);
+
+    // Check if the mock was called with the correct headers
+    expect(mockFetch).toHaveBeenCalledWith(url, expect.objectContaining({
+      headers: expect.objectContaining({
+        get: expect.any(Function),
+        has: expect.any(Function),
+      })
+    }));
+
+    // Get the headers from the mock call
+    const headers = mockFetch.mock.calls[0][1].headers;
+    expect(headers.get("user-agent")).toBe(USER_AGENT);
+  });
+
+  it("should not override existing user-agent header", async () => {
+    // Create a mock fetch function
+    const mockFetch = vi.fn().mockResolvedValue({
+      ok: true,
+    });
+
+    // Create a wrapped fetch with our utility
+    const wrappedFetch = createFetch(mockFetch);
+
+    // Call the wrapped fetch with a custom user-agent header
+    const url = "https://huggingface.co/api/test";
+    const customUserAgent = "custom-user-agent";
+    await wrappedFetch(url, {
+      headers: {
+        "user-agent": customUserAgent,
+      },
+    });
+
+    // Get the headers from the mock call
+    const headers = mockFetch.mock.calls[0][1].headers;
+    expect(headers.get("user-agent")).toBe(customUserAgent);
+  });
+
+  it("should preserve other headers and request options", async () => {
+    // Create a mock fetch function
+    const mockFetch = vi.fn().mockResolvedValue({
+      ok: true,
+    });
+
+    // Create a wrapped fetch with our utility
+    const wrappedFetch = createFetch(mockFetch);
+
+    // Call the wrapped fetch with additional headers and options
+    const url = "https://huggingface.co/api/test";
+    const options = {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+        "Authorization": "token-value",
+      },
+      body: JSON.stringify({ data: "test" }),
+    };
+
+    await wrappedFetch(url, options);
+
+    // Check if the mock was called with all the options preserved
+    expect(mockFetch).toHaveBeenCalledWith(url, expect.objectContaining({
+      method: "POST",
+      body: JSON.stringify({ data: "test" }),
+      headers: expect.objectContaining({
+        get: expect.any(Function),
+        has: expect.any(Function),
+      })
+    }));
+
+    // Get the headers from the mock call
+    const headers = mockFetch.mock.calls[0][1].headers;
+    expect(headers.get("Content-Type")).toBe("application/json");
+    expect(headers.get("Authorization")).toBe("token-value");
+    expect(headers.get("user-agent")).toBe(USER_AGENT);
+  });
+});

packages/hub/src/utils/createFetch.ts

@@ -0,0 +1,32 @@
+import { USER_AGENT } from "../consts";
+
+/**
+ * Creates a fetch wrapper that automatically adds the user-agent header with the package version
+ * 
+ * @param fetch - The base fetch function to wrap
+ * @returns A wrapped fetch function that includes the user-agent header
+ */
+export function createFetch(
+  baseFetch: typeof fetch = typeof fetch !== "undefined" ? fetch : undefined as unknown as typeof fetch
+): typeof fetch {
+  return function wrappedFetch(input: RequestInfo | URL, init?: RequestInit): Promise<Response> {
+    const headers = new Headers(init?.headers);
+
+    // Only add the user-agent if it's not already set
+    if (!headers.has("user-agent")) {
+      headers.set("user-agent", USER_AGENT);
+    }
+
+    const newInit: RequestInit = {
+      ...init,
+      headers,
+    };
+
+    return baseFetch(input, newInit);
+  };
+}
+
+/**
+ * Default fetch instance with user-agent header included
+ */
+export const fetchWithUserAgent = createFetch();

packages/hub/src/utils/index.ts

@@ -0,0 +1,2 @@
+// Export utility functions
+export * from "./createFetch";