restrict download-bus-stops to authenticated admin user

.env.local

@@ -1,5 +1,5 @@
 TRIGGER_API_KEY=tr_dev_f9kjPUxxfZO79OSjy1su
 TRIGGER_API_URL=https://api.trigger.dev
 NEXT_PUBLIC_TRIGGER_PUBLIC_API_KEY=pk_dev_0wewTNYuGo93XkoHaU9s
-NEXT_PUBLIC_SUPABASE_URL=https://yexfstvjfxhursmqcqcu.supabase.co
-NEXT_PUBLIC_SUPABASE_ANON_KEY=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJzdXBhYmFzZSIsInJlZiI6InlleGZzdHZqZnhodXJzbXFjcWN1Iiwicm9sZSI6ImFub24iLCJpYXQiOjE3MTI2ODg2OTMsImV4cCI6MjAyODI2NDY5M30.Mq1aKeO_SlwS-kEdsSn7VhHxHxNx1eeejd6jnBC7VJw
+NEXT_PUBLIC_SUPABASE_URL=http://127.0.0.1:54321
+NEXT_PUBLIC_SUPABASE_ANON_KEY=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJzdXBhYmFzZS1kZW1vIiwicm9sZSI6InNlcnZpY2Vfcm9sZSIsImV4cCI6MTk4MzgxMjk5Nn0.EGIM96RAZx35lJzdJsyH-qQwv8Hdp7fsn3W0YpN81IU

src/jobs/examples.ts

@@ -12,12 +12,13 @@ client.defineJob({
   id: "bus-stop-sanity-check",
   name: "Sanity Check Potential Job Arrivals",
   version: "0.1.1",
+  enabled: false, // 1 run per insert is a bit too insane.
   trigger: db.onInserted({
     table: 'potential_arrivals',
   }),
   run: async (payload, io, ctx) => {
     await io.runTask("log-payload", async function() {
-      console.log(payload);
+      io.logger.log(JSON.stringify(payload));
     });
   },
 });

supabase/functions/download-bus-stops/index.ts

@@ -1,4 +1,4 @@
-import { createClient } from "https://esm.sh/@supabase/supabase-js@2";
+import { SupabaseClient, createClient } from "https://esm.sh/@supabase/supabase-js@2";
 
 interface StraetoVariables {
   [key: string]: number | string;
@@ -97,31 +97,48 @@ async function getStops(): Promise<Array<StraetoBusStop>> {
   return body.data.GtfsStops.results;
 }
 
-Deno.serve(async (req) => {
-  const busStops = await getStops();
+async function verifyUserIsAdmin(userClient: SupabaseClient): Promise<boolean> {
+  const user = await userClient.auth.getUser();
+  const metadata = user.data.user?.app_metadata;
 
+  if (!metadata  || (metadata && !metadata.claims_admin)) {
+    return false;
+  }
+
+  return true;
+}
+
+Deno.serve(async (req) => {
   const authHeader = req.headers.get("Authorization")!;
-  const supabaseClient = createClient(
+
+  const userClient = createClient(
     Deno.env.get("SUPABASE_URL") ?? "",
-    Deno.env.get("SUPABASE_ANON_KEY") ?? "",
+    Deno.env.get("SUPABASE_SERVICE_ROLE_KEY") ?? "",
     { global: { headers: { Authorization: authHeader } } },
   );
 
+  const secureClient = createClient(
+    Deno.env.get("SUPABASE_URL") ?? "",
+    Deno.env.get("SUPABASE_SERVICE_ROLE_KEY") ?? "",
+  );
+
+  if (!(await verifyUserIsAdmin(userClient))) {
+    return new Response(
+      JSON.stringify({ status: "denied", error: "must be an admin" }),
+      { status: 403, headers: { "Content-Type": "application/json" } },
+    );
+  }
+
+  const busStops = await getStops();
+
   console.log("inserting", busStops.length, "rows");
   const toInsert = busStops.map(toDbBusStop);
 
-  const insert = await supabaseClient.from("bus_stops")
+  const insert = await secureClient.from("bus_stops")
     .upsert(toInsert, { ignoreDuplicates: true });
 
   console.log(insert.statusText, insert.error?.code, insert.error?.message);
 
-  console.log("rows inserted", insert.count);
-
-  // const { name } = await req.json()
-  // const data = {
-  //   message: `Hello ${name}!`,
-  // }
-
   return new Response(
     JSON.stringify({
       "status": insert.statusText,
@@ -139,7 +156,6 @@ Deno.serve(async (req) => {
 
   curl -i --location --request POST 'http://127.0.0.1:54321/functions/v1/download-bus-stops' \
     --header 'Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJzdXBhYmFzZS1kZW1vIiwicm9sZSI6ImFub24iLCJleHAiOjE5ODM4MTI5OTZ9.CRXP1A7WOeoJeXxjNni43kdQwgnWNReilDMblYTn_I0' \
-    --header 'Content-Type: application/json' \
-    --data '{"name":"Functions"}'
+    --header 'Content-Type: application/json'
 
 */

supabase/migrations/20240410213210_custom-claims.sql

@@ -0,0 +1,101 @@
+CREATE OR REPLACE FUNCTION is_claims_admin() RETURNS "bool"
+  LANGUAGE "plpgsql"
+  AS $$
+  BEGIN
+    IF session_user = 'authenticator' THEN
+      --------------------------------------------
+      -- To disallow any authenticated app users
+      -- from editing claims, delete the following
+      -- block of code and replace it with:
+      -- RETURN FALSE;
+      --------------------------------------------
+      IF extract(epoch from now()) > coalesce((current_setting('request.jwt.claims', true)::jsonb)->>'exp', '0')::numeric THEN
+        return false; -- jwt expired
+      END IF;
+      If current_setting('request.jwt.claims', true)::jsonb->>'role' = 'service_role' THEN
+        RETURN true; -- service role users have admin rights
+      END IF;
+      IF coalesce((current_setting('request.jwt.claims', true)::jsonb)->'app_metadata'->'claims_admin', 'false')::bool THEN
+        return true; -- user has claims_admin set to true
+      ELSE
+        return false; -- user does NOT have claims_admin set to true
+      END IF;
+      --------------------------------------------
+      -- End of block
+      --------------------------------------------
+    ELSE -- not a user session, probably being called from a trigger or something
+      return true;
+    END IF;
+  END;
+$$;
+
+CREATE OR REPLACE FUNCTION get_my_claims() RETURNS "jsonb"
+    LANGUAGE "sql" STABLE
+    AS $$
+  select
+  	coalesce(nullif(current_setting('request.jwt.claims', true), '')::jsonb -> 'app_metadata', '{}'::jsonb)::jsonb
+$$;
+CREATE OR REPLACE FUNCTION get_my_claim(claim TEXT) RETURNS "jsonb"
+    LANGUAGE "sql" STABLE
+    AS $$
+  select
+  	coalesce(nullif(current_setting('request.jwt.claims', true), '')::jsonb -> 'app_metadata' -> claim, null)
+$$;
+
+CREATE OR REPLACE FUNCTION get_claims(uid uuid) RETURNS "jsonb"
+    LANGUAGE "plpgsql" SECURITY DEFINER SET search_path = public
+    AS $$
+    DECLARE retval jsonb;
+    BEGIN
+      IF NOT is_claims_admin() THEN
+          RETURN '{"error":"access denied"}'::jsonb;
+      ELSE
+        select raw_app_meta_data from auth.users into retval where id = uid::uuid;
+        return retval;
+      END IF;
+    END;
+$$;
+
+CREATE OR REPLACE FUNCTION get_claim(uid uuid, claim text) RETURNS "jsonb"
+    LANGUAGE "plpgsql" SECURITY DEFINER SET search_path = public
+    AS $$
+    DECLARE retval jsonb;
+    BEGIN
+      IF NOT is_claims_admin() THEN
+          RETURN '{"error":"access denied"}'::jsonb;
+      ELSE
+        select coalesce(raw_app_meta_data->claim, null) from auth.users into retval where id = uid::uuid;
+        return retval;
+      END IF;
+    END;
+$$;
+
+CREATE OR REPLACE FUNCTION set_claim(uid uuid, claim text, value jsonb) RETURNS "text"
+    LANGUAGE "plpgsql" SECURITY DEFINER SET search_path = public
+    AS $$
+    BEGIN
+      IF NOT is_claims_admin() THEN
+          RETURN 'error: access denied';
+      ELSE
+        update auth.users set raw_app_meta_data =
+          raw_app_meta_data ||
+            json_build_object(claim, value)::jsonb where id = uid;
+        return 'OK';
+      END IF;
+    END;
+$$;
+
+CREATE OR REPLACE FUNCTION delete_claim(uid uuid, claim text) RETURNS "text"
+    LANGUAGE "plpgsql" SECURITY DEFINER SET search_path = public
+    AS $$
+    BEGIN
+      IF NOT is_claims_admin() THEN
+          RETURN 'error: access denied';
+      ELSE
+        update auth.users set raw_app_meta_data =
+          raw_app_meta_data - claim where id = uid;
+        return 'OK';
+      END IF;
+    END;
+$$;
+NOTIFY pgrst, 'reload schema';