Edge Functions

Integrating With Supabase Auth

Integrate Supabase Auth with Edge Functions

Edge Functions work with Supabase Auth.

This allows you to:

  • Automatically identify users through Legacy JWT tokens
  • Enforce Row Level Security policies
  • Integrate with your existing auth flow

Setting up auth context#

When a user makes a request to an Edge Function, you can use the Authorization header to set the Auth context in the Supabase client and enforce Row Level Security policies.

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import { createClient } from 'npm:@supabase/supabase-js@2'
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Deno.serve(async (req: Request) => {
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  const supabaseClient = createClient(
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    Deno.env.get('SUPABASE_URL') ?? '',
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    Deno.env.get('SUPABASE_ANON_KEY') ?? '',
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    // Create client with Auth context of the user that called the function.
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    // This way your row-level-security (RLS) policies are applied.
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    {
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      global: {
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        headers: { Authorization: req.headers.get('Authorization')! },
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      },
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    }
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  );
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  //...
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})

Fetching the user#

By getting the JWT from the Authorization header, you can provide the token to getUser() to fetch the user object to obtain metadata for the logged in user.

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Deno.serve(async (req: Request) => {
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  // ...
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  const authHeader = req.headers.get('Authorization')!
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  const token = authHeader.replace('Bearer ', '')
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  const { data } = await supabaseClient.auth.getUser(token)
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  // ...
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})

Row Level Security#

After initializing a Supabase client with the Auth context, all queries will be executed with the context of the user. For database queries, this means Row Level Security will be enforced.

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import { createClient } from 'npm:@supabase/supabase-js@2'
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Deno.serve(async (req: Request) => {
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  // ...
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  // This query respects RLS - users only see rows they have access to
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  const { data, error } = await supabaseClient.from('profiles').select('*');
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  if (error) {
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    return new Response('Database error', { status: 500 })
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  }
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  // ...
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})

Example#

See the full example on GitHub.

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// Follow this setup guide to integrate the Deno language server with your editor:
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// https://deno.land/manual/getting_started/setup_your_environment
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// This enables autocomplete, go to definition, etc.
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import { withSupabase } from 'npm:@supabase/server@^1'
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console.log(`Function "select-from-table-with-auth-rls" up and running!`)
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export default {
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  fetch: withSupabase({ auth: 'user' }, async (req, ctx) => {
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    try {
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      // ctx.supabase runs queries as the authenticated user, so RLS applies.
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      // ctx.userClaims holds the verified user identity.
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      const { data, error } = await ctx.supabase.from('users').select('*')
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      if (error) throw error
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      return Response.json({ user: ctx.userClaims, data })
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    } catch (error) {
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      return Response.json({ error: error.message }, { status: 400 })
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    }
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  }),
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}
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// To invoke (auth: 'user' requires a signed-in user's access token):
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// curl -i --location --request POST 'http://localhost:54321/functions/v1/select-from-table-with-auth-rls' \
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//   --header 'Authorization: Bearer <USER_ACCESS_TOKEN>' \
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//   --header 'Content-Type: application/json' \
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//   --data '{"name":"Functions"}'
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