Ensuring the website uses the most specific auth type with the backend when fetching and interacting with tasks

website/src/lib/users.ts

@@ -0,0 +1,38 @@
+import prisma from "src/lib/prismadb";
+import type { BackendUserCore } from "src/types/Users";
+
+/**
+ * Returns a `BackendUserCore` that can be used for interacting with the Backend service.
+ *
+ * @param {string} id The user's web auth id.
+ *
+ * @return {BackendUserCore} The most specific auth type and id for the user.
+ */
+const getBackendUserCore = async (id: string) => {
+  const user = await prisma.user.findUnique({
+    where: { id },
+    select: {
+      id: true,
+      name: true,
+      accounts: true,
+    },
+  });
+
+  // If there are no linked accounts, just use what we have locally.
+  if (user.accounts.length === 0) {
+    return {
+      id: user.id,
+      display_name: user.name,
+      auth_method: "local",
+    } as BackendUserCore;
+  }
+
+  // Otherwise, use the first linked account that the user created.
+  return {
+    id: user.accounts[0].providerAccountId,
+    display_name: user.name,
+    auth_method: user.accounts[0].provider,
+  } as BackendUserCore;
+};
+
+export { getBackendUserCore };