feat: patreon check

src/app/api/patreon/membership/[token]/route.ts

@@ -0,0 +1,75 @@
+import { NextResponse } from 'next/server';
+
+interface PatreonMembershipResponse {
+  data: {
+    attributes: unknown;
+    id: `${number}`;
+    relationships: {
+      memberships: {
+        data: {
+          id: string; // uuid
+          type: 'member';
+        }[];
+      };
+    };
+    type: 'user';
+  };
+  included: (
+    | {
+        attributes: {
+          patron_status:
+            | 'active_patron'
+            | 'declined_patron'
+            | 'former_patron'
+            | null; // null = never a paid member
+        };
+        id: string; // uuid
+        relationships: {
+          campaign: {
+            data: {
+              id: `${number}`; // id of my campaign to check against
+              type: 'campaign';
+            };
+            links: {
+              related: string; // url
+            };
+          };
+        };
+        type: 'member';
+      }
+    | {
+        attributes: {};
+        id: `${number}`;
+        type: 'campaign'; // ignore this discriminator
+      }
+  )[];
+  links: {
+    self: 'https://www.patreon.com/api/oauth2/v2/user/124201389';
+  };
+}
+
+export async function GET(
+  request: Request,
+  { params }: { params: { token: string } },
+) {
+  const response = await fetch(
+    encodeURI(
+      'https://www.patreon.com/api/oauth2/v2/identity?include=memberships.campaign&fields[member]=patron_status',
+    ),
+    { headers: { Authorization: `Bearer ${params.token}` } },
+  );
+
+  if (!response.ok) return NextResponse.json(false);
+
+  const json = (await response.json()) as PatreonMembershipResponse;
+
+  return NextResponse.json(
+    json.included.some(
+      (item) =>
+        item.type === 'member' &&
+        item.relationships.campaign.data.id ===
+          process.env.PATREON_CAMPAIGN_ID &&
+        item.attributes.patron_status === 'active_patron',
+    ),
+  );
+}