feat(frontend): working Discord login + signup

frontend/src/routes/auth/login/discord/+page.server.ts

@@ -0,0 +1,35 @@
+import type { APIError, MeUser } from "$lib/api/entities";
+import { apiFetch } from "$lib/api/fetch";
+import type { PageServerLoad, Actions } from "./$types";
+import { PUBLIC_BASE_URL } from "$env/static/public";
+
+export const load = (async ({ locals, url }) => {
+  try {
+    const resp = await apiFetch<CallbackResponse>("/auth/discord/callback", {
+      method: "POST",
+      body: {
+        callback_domain: PUBLIC_BASE_URL,
+        code: url.searchParams.get("code"),
+        state: url.searchParams.get("state"),
+      },
+    });
+
+    return {
+      ...resp,
+    };
+  } catch (e) {
+    console.log(e);
+
+    return { error: e as APIError };
+  }
+}) satisfies PageServerLoad;
+
+interface CallbackResponse {
+  has_account: boolean;
+  token?: string;
+  user?: MeUser;
+
+  discord?: string;
+  ticket?: string;
+  require_invite: boolean;
+}

frontend/src/routes/auth/login/discord/+page.svelte

@@ -0,0 +1,95 @@
+<script lang="ts">
+  import { onMount } from "svelte";
+  import { Alert } from "sveltestrap";
+
+  import { goto } from "$app/navigation";
+  import type { APIError, MeUser } from "$lib/api/entities";
+  import { apiFetch } from "$lib/api/fetch";
+  import { userStore } from "$lib/store";
+  import type { PageData } from "./$types";
+
+  interface SignupResponse {
+    user: MeUser;
+    token: string;
+  }
+
+  export let data: PageData;
+
+  onMount(() => {
+    if (data.token && data.user) {
+      localStorage.setItem("pronouns-token", data.token);
+      userStore.set(data.user);
+      goto("/");
+    }
+  });
+
+  let username = "";
+  let invite = "";
+
+  const signupForm = async () => {
+    try {
+      const resp = await apiFetch<SignupResponse>("/auth/discord/signup", {
+        method: "POST",
+        body: {
+          ticket: data.ticket,
+          username: username,
+          invite_code: invite,
+        },
+      });
+
+      localStorage.setItem("pronouns-token", resp.token);
+      userStore.set(resp.user);
+      goto("/");
+    } catch (e) {
+      data.error = e as APIError;
+    }
+  };
+</script>
+
+<svelte:head>
+  <title>Log in with Discord - pronouns.cc</title>
+</svelte:head>
+
+<h1>Log in with Discord</h1>
+
+{#if data.error}
+  <Alert color="danger">
+    <h4 class="alert-heading">An error occurred</h4>
+    <b>{data.error.code}:</b>
+    {data.error.message}
+  </Alert>
+{/if}
+{#if data.ticket}
+  <form on:submit|preventDefault={signupForm}>
+    <div>
+      <label for="discord">Discord username</label>
+      <input id="discord" class="form-control" name="discord" disabled value={data.discord} />
+    </div>
+    <div>
+      <label for="username">Username</label>
+      <input id="username" class="form-control" name="username" bind:value={username} />
+    </div>
+    {#if data.require_invite}
+      <div>
+        <label for="invite">Invite code</label>
+        <input
+          id="invite"
+          class="form-control"
+          name="invite"
+          bind:value={invite}
+          aria-describedby="invite-help"
+        />
+        <div id="invite-help" class="form-text">
+          You currently need an invite code to sign up. You can get one from an existing user.
+        </div>
+      </div>
+    {/if}
+    <div class="form-text">
+      By signing up, you agree to the <a href="/page/tos">terms of service</a> and the
+      <a href="/page/privacy">privacy policy</a>.
+    </div>
+    <button type="submit" class="btn btn-primary">Sign up</button>
+  </form>
+{:else}
+  Loading...
+{/if}