fix: add Session and Login

src/Login.tsx

@@ -0,0 +1,86 @@
+import { FormEvent, useContext, useState } from "react";
+import { useNavigate } from "react-router";
+import { currentUser, login, LoginRequest, User } from "./api";
+
+export interface LoginProps {
+  onLogin: (user: User) => void;
+}
+
+export const Login = ({ onLogin }: LoginProps) => {
+  const [username, setUsername] = useState("");
+  const [password, setPassword] = useState("");
+  const [error, setError] = useState<unknown>(null);
+  const [loading, setLoading] = useState(false);
+
+  async function doLogin() {
+    setLoading(true);
+    setError(null);
+    const timeout = new Promise((r) => setTimeout(r, 1500));
+    let user: User;
+    try {
+      login({ username, password });
+      user = await currentUser();
+    } catch (e) {
+      await timeout;
+      setError(e);
+      setLoading(false);
+      return
+    }
+
+    await timeout;
+    onLogin(user);
+  }
+
+  function handleClick() {
+    doLogin();
+  }
+
+  function handleSubmit(e: React.FormEvent) {
+    e.preventDefault();
+    doLogin();
+  }
+
+  return (
+    <form onSubmit={handleSubmit}>
+      <div>
+        <input type="text" id="username" name="username" placeholder="username" required value={username} onChange={evt => setUsername(evt.target.value)} />
+      </div>
+      <div>
+        <input type="password" id="password" name="password" placeholder="password" minLength={8} value={password} required onChange={evt => setPassword(evt.target.value)} />
+      </div>
+      <button type="submit" value="login" style={{ fontSize: "small" }} onClick={handleClick} >login</button>
+      {loading && <span className="loader" />}
+    </form>
+  )
+}
+
+/*
+export default function Login(props: { onLogin: (user: User) => void }) {
+  const { onLogin } = props;
+  const [username, setUsername] = useState("");
+  const [password, setPassword] = useState("");
+
+  async function handleLogin(e: FormEvent) {
+    e.preventDefault()
+    const timeout = new Promise((r) => setTimeout(r, 1500));
+    let user: User;
+    try {
+      login({ username, password })
+      user = await currentUser()
+    } catch (e) { await timeout; return }
+    await timeout;
+    onLogin(user);
+  }
+
+  return <div>
+    <form onSubmit={handleLogin}>
+      <div>
+        <input type="text" id="username" name="username" placeholder="username" required value={username} onChange={evt => setUsername(evt.target.value)} />
+      </div>
+      <div>
+        <input type="password" id="password" name="password" placeholder="password" minLength={8} value={password} required onChange={evt => setPassword(evt.target.value)} />
+      </div>
+      <input className="button" type="submit" value="login" onSubmit={handleLogin} />
+    </form>
+  </div>
+} */

src/Session.tsx

@@ -0,0 +1,40 @@
+import { createContext, ReactNode, useContext, useLayoutEffect, useState } from "react";
+import { currentUser, User } from "./api";
+import { Login } from "./Login";
+
+export interface SessionProviderProps {
+  children: ReactNode;
+}
+
+const sessionContext = createContext<User | null>(null);
+
+export function SessionProvider(props: SessionProviderProps) {
+  const { children } = props;
+
+  const [user, setUser] = useState<User | null>(null);
+  const [err, setErr] = useState<unknown>(null);
+
+  function loadUser() {
+    currentUser()
+      .then((user) => { setUser(user); setErr(null); })
+      .catch((err) => { setUser(null); setErr(err); });
+  }
+
+  useLayoutEffect(() => { loadUser(); }, [err]);
+
+  function onLogin(user: User) {
+    setUser(user);
+    setErr(null);
+  }
+
+  let content: ReactNode;
+  if (!err && !user) content = <span className="loader" />;
+  else if (err) content = <Login onLogin={onLogin} />;
+  else content = <sessionContext.Provider value={user}>{children}</sessionContext.Provider>;
+
+  return content;
+}
+
+export function useSession() {
+  return useContext(sessionContext);
+}