Start separating authentication from connection to collab (#35471)

This pull request should be idempotent, but lays the groundwork for
avoiding to connect to collab in order to interact with AI features
provided by Zed.

Release Notes:

- N/A

---------

Co-authored-by: Marshall Bowers <git@maxdeviant.com>
Co-authored-by: Richard Feldman <oss@rtfeldman.com>

crates/client/src/test.rs

@@ -1,8 +1,11 @@
 use crate::{Client, Connection, Credentials, EstablishConnectionError, UserStore};
 use anyhow::{Context as _, Result, anyhow};
 use chrono::Duration;
+use cloud_api_client::{AuthenticatedUser, GetAuthenticatedUserResponse, PlanInfo};
+use cloud_llm_client::{CurrentUsage, Plan, UsageData, UsageLimit};
 use futures::{StreamExt, stream::BoxStream};
 use gpui::{AppContext as _, BackgroundExecutor, Entity, TestAppContext};
+use http_client::{AsyncBody, Method, Request, http};
 use parking_lot::Mutex;
 use rpc::{
     ConnectionId, Peer, Receipt, TypedEnvelope,
@@ -39,6 +42,44 @@ impl FakeServer {
             executor: cx.executor(),
         };
 
+        client.http_client().as_fake().replace_handler({
+            let state = server.state.clone();
+            move |old_handler, req| {
+                let state = state.clone();
+                let old_handler = old_handler.clone();
+                async move {
+                    match (req.method(), req.uri().path()) {
+                        (&Method::GET, "/client/users/me") => {
+                            let credentials = parse_authorization_header(&req);
+                            if credentials
+                                != Some(Credentials {
+                                    user_id: client_user_id,
+                                    access_token: state.lock().access_token.to_string(),
+                                })
+                            {
+                                return Ok(http_client::Response::builder()
+                                    .status(401)
+                                    .body("Unauthorized".into())
+                                    .unwrap());
+                            }
+
+                            Ok(http_client::Response::builder()
+                                .status(200)
+                                .body(
+                                    serde_json::to_string(&make_get_authenticated_user_response(
+                                        client_user_id as i32,
+                                        format!("user-{client_user_id}"),
+                                    ))
+                                    .unwrap()
+                                    .into(),
+                                )
+                                .unwrap())
+                        }
+                        _ => old_handler(req).await,
+                    }
+                }
+            }
+        });
         client
             .override_authenticate({
                 let state = Arc::downgrade(&server.state);
@@ -105,7 +146,7 @@ impl FakeServer {
             });
 
         client
-            .authenticate_and_connect(false, &cx.to_async())
+            .connect(false, &cx.to_async())
             .await
             .into_response()
             .unwrap();
@@ -223,3 +264,54 @@ impl Drop for FakeServer {
         self.disconnect();
     }
 }
+
+pub fn parse_authorization_header(req: &Request<AsyncBody>) -> Option<Credentials> {
+    let mut auth_header = req
+        .headers()
+        .get(http::header::AUTHORIZATION)?
+        .to_str()
+        .ok()?
+        .split_whitespace();
+    let user_id = auth_header.next()?.parse().ok()?;
+    let access_token = auth_header.next()?;
+    Some(Credentials {
+        user_id,
+        access_token: access_token.to_string(),
+    })
+}
+
+pub fn make_get_authenticated_user_response(
+    user_id: i32,
+    github_login: String,
+) -> GetAuthenticatedUserResponse {
+    GetAuthenticatedUserResponse {
+        user: AuthenticatedUser {
+            id: user_id,
+            metrics_id: format!("metrics-id-{user_id}"),
+            avatar_url: "".to_string(),
+            github_login,
+            name: None,
+            is_staff: false,
+            accepted_tos_at: None,
+        },
+        feature_flags: vec![],
+        plan: PlanInfo {
+            plan: Plan::ZedPro,
+            subscription_period: None,
+            usage: CurrentUsage {
+                model_requests: UsageData {
+                    used: 0,
+                    limit: UsageLimit::Limited(500),
+                },
+                edit_predictions: UsageData {
+                    used: 250,
+                    limit: UsageLimit::Unlimited,
+                },
+            },
+            trial_started_at: None,
+            is_usage_based_billing_enabled: false,
+            is_account_too_young: false,
+            has_overdue_invoices: false,
+        },
+    }
+}