fix: Detect Pomerium proxy (#3219)

* chore: Remove unused DocumentList component

* fix: Add support for detecting Pomerium

* Refactor to avoid reading cookies on every request

* refactor: Just enable cookies for all self-hosted builds

* Remove unused userAgent

* test: Add window.env to mock

__mocks__/window.js

@@ -1 +1,2 @@
-window.matchMedia = data => data;
+window.matchMedia = (data) => data;
+window.env = {};

app/utils/ApiClient.ts

@@ -1,9 +1,9 @@
 import retry from "fetch-retry";
 import invariant from "invariant";
 import { map, trim } from "lodash";
-import { getCookie } from "tiny-cookie";
 import EDITOR_VERSION from "@shared/editor/version";
 import stores from "~/stores";
+import env from "~/env";
 import download from "./download";
 import {
   AuthorizationError,
@@ -19,21 +19,15 @@ import {
 type Options = {
   baseUrl?: string;
 };
-// authorization cookie set by a Cloudflare Access proxy
-const CF_AUTHORIZATION = getCookie("CF_Authorization");
 
-// if the cookie is set, we must pass it with all ApiClient requests
-const CREDENTIALS = CF_AUTHORIZATION ? "same-origin" : "omit";
 const fetchWithRetry = retry(fetch);
+const isHosted = env.DEPLOYMENT === "hosted";
 
 class ApiClient {
   baseUrl: string;
 
-  userAgent: string;
-
   constructor(options: Options = {}) {
     this.baseUrl = options.baseUrl || "/api";
-    this.userAgent = "OutlineFrontend";
   }
 
   fetch = async (
@@ -105,7 +99,11 @@ class ApiClient {
         body,
         headers,
         redirect: "follow",
-        credentials: CREDENTIALS,
+        // For the hosted deployment we omit cookies on API requests as they are
+        // not needed for authentication this offers a performance increase.
+        // For self-hosted we include them to support a wide variety of
+        // authenticated proxies, e.g. Pomerium, Cloudflare Access etc.
+        credentials: isHosted ? "omit" : "same-origin",
         cache: "no-cache",
       });
     } catch (err) {
@@ -203,8 +201,7 @@ class ApiClient {
     return this.fetch(path, "POST", data, options);
   };
 
-  // Helpers
-  constructQueryString = (data: Record<string, any>) => {
+  private constructQueryString = (data: Record<string, any>) => {
     return map(
       data,
       (v, k) => `${encodeURIComponent(k)}=${encodeURIComponent(v)}`
@@ -212,6 +209,4 @@ class ApiClient {
   };
 }
 
-export default ApiClient; // In case you don't want to always initiate, just import with `import { client } ...`
-
 export const client = new ApiClient();