Skip to main content

Build a User Management App with Svelte

还没翻译译自英文（supabase.com）本页 45 段都还没译

This tutorial demonstrates how to build a basic user management app. The app authenticates and identifies the user, stores their profile information in the database, and allows the user to log in, update their profile details, and upload a profile photo. The app uses:

Supabase User Management example

Note

If you get stuck while working through this guide, you can find the full example on GitHub.

Project setup

Before you start building you need to set up the Database and API. You can do this by starting a new Project in Supabase and then creating a "schema" inside the database.

Create a project

  1. Create a new project in the Supabase Dashboard.
  2. Enter your project details.
  3. Wait for the new database to launch.

Set up the database schema

Now set up the database schema. You can use the "User Management Starter" quickstart in the SQL Editor, or you can copy/paste the SQL from below and run it.

  1. Go to the SQL Editor page in the Dashboard.
  2. Click User Management Starter under the Reference > Examples tab.
  3. Click Run.

Note

You can pull the database schema down to your local project by running the db pull command. Read the local development docs for detailed instructions.

supabase link --project-ref <project-id>
# You can get <project-id> from your project's dashboard URL: https://supabase.com/dashboard/project/<project-id>
supabase db pull

Note

When working locally you can run the following command to create a new migration file:

supabase migration new user_management_starter
-- Create a table for public profiles
create table profiles (
  id uuid references auth.users not null primary key,
  updated_at timestamp with time zone,
  username text unique,
  full_name text,
  avatar_url text,
  website text,

  constraint username_length check (char_length(username) >= 3)
);

-- Grant the privileges roles need
GRANT SELECT ON public.profiles TO anon;
GRANT SELECT, INSERT, UPDATE ON public.profiles TO authenticated;

-- Set up Row Level Security (RLS)
-- See https://supabase.com/docs/guides/database/postgres/row-level-security for more details.
alter table profiles
  enable row level security;

create policy "Public profiles are viewable by everyone." on profiles
  for select using (true);

create policy "Users can insert their own profile." on profiles
  for insert with check ((select auth.uid()) = id);

create policy "Users can update own profile." on profiles
  for update using ((select auth.uid()) = id);

-- This trigger automatically creates a profile entry when a new user signs up via Supabase Auth.
-- See https://supabase.com/docs/guides/auth/managing-user-data#using-triggers for more details.
create function public.handle_new_user()
returns trigger
set search_path = ''
as $$
begin
  insert into public.profiles (id, full_name, avatar_url)
  values (new.id, new.raw_user_meta_data->>'full_name', new.raw_user_meta_data->>'avatar_url');
  return new;
end;
$$ language plpgsql security definer;
create trigger on_auth_user_created
  after insert on auth.users
  for each row execute procedure public.handle_new_user();

-- Set up Storage!
insert into storage.buckets (id, name)
  values ('avatars', 'avatars');

-- Set up access controls for storage. Allows downloading object with public key
-- See https://supabase.com/docs/guides/storage/security/access-control#policy-examples for more details.
create policy "Avatar images are publicly accessible." on storage.objects
  for select using (bucket_id = 'avatars' and storage.allow_any_operation(array['object.get_authenticated_info', 'object.get_authenticated']));

create policy "Anyone can upload an avatar." on storage.objects
  for insert with check (bucket_id = 'avatars');

create policy "Anyone can update their own avatar." on storage.objects
  for update using ((select auth.uid()) = owner) with check (bucket_id = 'avatars');

Get API details

To interact with data in database tables, you use the client libraries that wrap the auto-generated Data API endpoints, authenticating using the Project URL and key from the project Connect dialog.

Project URL: https://<project-ref>.supabase.co (find yours in the dashboard)

Publishable key: sb_publishable_... (find yours in the dashboard)

Note

See API keys for a full explanation of all key types, their uses, and where to find them.

Building the app

Start building the Svelte app from scratch.

Initialize a Svelte app

You can use the Vite Svelte TypeScript Template to initialize an app called supabase-svelte:

npm create vite@latest supabase-svelte -- --template svelte-ts
cd supabase-svelte
npm install

Install the only additional dependency: supabase-js

npm install @supabase/supabase-js

Finally, save the environment variables in a .env. All you need are the API URL and the key that you copied earlier.

VITE_SUPABASE_URL=YOUR_SUPABASE_URL
VITE_SUPABASE_PUBLISHABLE_KEY=YOUR_SUPABASE_PUBLISHABLE_KEY

Now you have the API credentials in place, create a helper file to initialize the Supabase client. These variables will be exposed on the browser, and that's fine since you have Row Level Security enabled on the Database.

import { createClient } from '@supabase/supabase-js'

const supabaseUrl = import.meta.env.VITE_SUPABASE_URL
const supabasePublishableKey = import.meta.env.VITE_SUPABASE_PUBLISHABLE_KEY

export const supabase = createClient(supabaseUrl, supabasePublishableKey)

App styling (optional)

Optionally, update the CSS file src/app.css to make the app look better. You can find the full contents of this file in the example repository.

Set up a sign-in component

Set up a Svelte component to manage sign-ins and sign-ups. It uses Magic Links, so users can sign in with their email without using passwords.

<script lang="ts">
  import { supabase } from "../supabaseClient";

  let loading = $state(false);
  let email = $state("");

  const handleLogin = async () => {
    try {
      loading = true;
      const { error } = await supabase.auth.signInWithOtp({ email });
      if (error) throw error;
      alert("Check your email for login link!");
    } catch (error) {
      if (error instanceof Error) {
        alert(error.message);
      }
    } finally {
      loading = false;
    }
  };
</script>

<div class="row flex-center flex">

  <div class="col-6 form-widget" aria-live="polite">
    <h1 class="header">Supabase + Svelte</h1>
    <p class="description">Sign in via magic link with your email below</p>
    <form class="form-widget" onsubmit={(e) => { e.preventDefault(); handleLogin(); }}>
      <div>
        <label for="email">Email</label>
        <input
          id="email"
          class="inputField"
          type="email"
          placeholder="Your email"
          bind:value={email}
        />
      </div>
      <div>
        <button
          type="submit"
          class="button block"
          aria-live="polite"
          disabled={loading}
        >
          <span>{loading ? "Loading" : "Send magic link"}</span>
        </button>
      </div>
    </form>
  </div>

</div>

Account page

After a user is signed in, allow them to edit their profile details and manage their account. Create a new component for that called Account.svelte.

<script lang="ts">
  import { onMount } from "svelte";
  import type { AuthSession } from "@supabase/supabase-js";
  import { supabase } from "../supabaseClient";

// ...


  interface Props {
    session: AuthSession;
  }

  let { session }: Props = $props();

  let loading = $state(false);
  let username = $state<string | null>(null);
  let website = $state<string | null>(null);
  let avatarUrl = $state<string | null>(null);

  onMount(() => {
    getProfile();
  });

  const getProfile = async () => {
    try {
      loading = true;
      const { user } = session;

      const { data, error, status } = await supabase
        .from("profiles")
        .select("username, website, avatar_url")
        .eq("id", user.id)
        .single();

      if (error && status !== 406) throw error;

      if (data) {
        username = data.username;
        website = data.website;
        avatarUrl = data.avatar_url;
      }
    } catch (error) {
      if (error instanceof Error) {
        alert(error.message);
      }
    } finally {
      loading = false;
    }
  };

  const updateProfile = async () => {
    try {
      loading = true;
      const { user } = session;

      const updates = {
        id: user.id,
        username,
        website,
        avatar_url: avatarUrl,
        updated_at: new Date().toISOString(),
      };

      const { error } = await supabase.from("profiles").upsert(updates);

      if (error) {
        throw error;
      }
    } catch (error) {
      if (error instanceof Error) {
        alert(error.message);
      }
    } finally {
      loading = false;
    }
  };
</script>

<form onsubmit={(e) => { e.preventDefault(); updateProfile(); }} class="form-widget">
  <div>Email: {session.user.email}</div>
  <div>

    // ...

    <label for="username">Name</label>
    <input id="username" type="text" bind:value={username} />
  </div>
  <div>
    <label for="website">Website</label>
    <input id="website" type="text" bind:value={website} />
  </div>
  <div>
    <button type="submit" class="button primary block" disabled={loading}>
      {loading ? "Saving ..." : "Update profile"}
    </button>
  </div>
  <button
    type="button"
    class="button block"
    onclick={() => supabase.auth.signOut()}
  >
    Sign Out
  </button>
</form>

Profile photos

Next, add a way for users to upload a profile photo. Supabase configures every project with Storage for managing large files like photos and videos.

Create an upload widget

Start by creating a new component:

<script lang="ts">
  import { supabase } from "../supabaseClient";

  interface Props {
    size: number;
    url?: string | null;
    onupload?: () => void;
  }

  let { size, url = $bindable(null), onupload }: Props = $props();

  let avatarUrl = $state<string | null>(null);
  let uploading = $state(false);
  let files = $state<FileList>();

  const downloadImage = async (path: string) => {
    try {
      const { data, error } = await supabase.storage
        .from("avatars")
        .download(path);

      if (error) {
        throw error;
      }

      const url = URL.createObjectURL(data);
      avatarUrl = url;
    } catch (error) {
      if (error instanceof Error) {
        console.log("Error downloading image: ", error.message);
      }
    }
  };

  const uploadAvatar = async () => {
    try {
      uploading = true;

      if (!files || files.length === 0) {
        throw new Error("You must select an image to upload.");
      }

      const file = files[0];
      const fileExt = file.name.split(".").pop();
      const filePath = `${Math.random()}.${fileExt}`;

      const { error } = await supabase.storage
        .from("avatars")
        .upload(filePath, file);

      if (error) {
        throw error;
      }

      url = filePath;
      onupload?.();
    } catch (error) {
      if (error instanceof Error) {
        alert(error.message);
      }
    } finally {
      uploading = false;
    }
  };

  $effect(() => {
    if (url) downloadImage(url);
  });
</script>

<div style="width: {size}px" aria-live="polite">

  {#if avatarUrl}
    <img
      src={avatarUrl}
      alt={avatarUrl ? "Avatar" : "No image"}
      class="avatar image"
      style="height: {size}px, width: {size}px"
    />
  {:else}
    <div class="avatar no-image" style="height: {size}px, width: {size}px"></div>
  {/if}
  <div style="width: {size}px">
    <label class="button primary block" for="single">
      {uploading ? "Uploading ..." : "Upload avatar"}
    </label>
    <span style="display:none">
      <input
        type="file"
        id="single"
        accept="image/*"
        bind:files
        onchange={uploadAvatar}
        disabled={uploading}
      />
    </span>
  </div>

</div>

Update the account component

With the Avatar component created, update src/lib/Account.svelte to include it:

<script lang="ts">
  import { onMount } from "svelte";
  import type { AuthSession } from "@supabase/supabase-js";
  import { supabase } from "../supabaseClient";
  import Avatar from "./Avatar.svelte";

  interface Props {
    session: AuthSession;
  }

  let { session }: Props = $props();

  let loading = $state(false);
  let username = $state<string | null>(null);
  let website = $state<string | null>(null);
  let avatarUrl = $state<string | null>(null);

  onMount(() => {
    getProfile();
  });

  const getProfile = async () => {
    try {
      loading = true;
      const { user } = session;

      const { data, error, status } = await supabase
        .from("profiles")
        .select("username, website, avatar_url")
        .eq("id", user.id)
        .single();

      if (error && status !== 406) throw error;

      if (data) {
        username = data.username;
        website = data.website;
        avatarUrl = data.avatar_url;
      }
    } catch (error) {
      if (error instanceof Error) {
        alert(error.message);
      }
    } finally {
      loading = false;
    }
  };

  const updateProfile = async () => {
    try {
      loading = true;
      const { user } = session;

      const updates = {
        id: user.id,
        username,
        website,
        avatar_url: avatarUrl,
        updated_at: new Date().toISOString(),
      };

      const { error } = await supabase.from("profiles").upsert(updates);

      if (error) {
        throw error;
      }
    } catch (error) {
      if (error instanceof Error) {
        alert(error.message);
      }
    } finally {
      loading = false;
    }
  };
</script>

<form onsubmit={(e) => { e.preventDefault(); updateProfile(); }} class="form-widget">
  <div>Email: {session.user.email}</div>
  <div>
    <Avatar bind:url={avatarUrl} size={150} onupload={updateProfile} />
    <label for="username">Name</label>
    <input id="username" type="text" bind:value={username} />
  </div>
  <div>
    <label for="website">Website</label>
    <input id="website" type="text" bind:value={website} />
  </div>
  <div>
    <button type="submit" class="button primary block" disabled={loading}>
      {loading ? "Saving ..." : "Update profile"}
    </button>
  </div>
  <button
    type="button"
    class="button block"
    onclick={() => supabase.auth.signOut()}
  >
    Sign Out
  </button>
</form>

Launch!

With all the components in place, update App.svelte:

<script lang="ts">
  import { onMount } from 'svelte'
  import { supabase } from './supabaseClient'
  import type { AuthSession } from '@supabase/supabase-js'
  import Account from './lib/Account.svelte'
  import Auth from './lib/Auth.svelte'

  let session = $state<AuthSession | null>(null)

  onMount(() => {
    supabase.auth.getSession().then(({ data }) => {
      session = data.session
    })

    supabase.auth.onAuthStateChange((_event, _session) => {
      session = _session
    })
  })
</script>

<div class="container" style="padding: 50px 0 100px 0">

  {#if !session}
  <Auth />
  {:else}
  <Account {session} />
  {/if}

</div>

Once that's done, run this in a terminal window:

npm run dev

And then open the browser to localhost:5173 and you should see the completed app.

Note

Svelte uses Vite and the default port is 5173, Supabase uses port 3000. To change the redirection port for Supabase go to: Authentication > URL Configuration and change the Site URL to http://localhost:5173/

Supabase Svelte

At this stage you have a fully functional application!

Edit on GitHub
AI 翻译查看英文原文