Make compatible with Microsoft Entra (v1 and v2 tokens) (#821)

* Make the profile picture claim optional

Some identity providers (such as Azure AD) do not provide or support the
picture claim. This patch makes it optional.

* Allow using Microsoft Entra v1 tokens

---------

Co-authored-by: Nathan Sarrazin <sarrazin.nathan@gmail.com>

src/lib/types/User.ts

@@ -7,6 +7,6 @@ export interface User extends Timestamps {
 	username?: string;
 	name: string;
 	email?: string;
-	avatarUrl: string;
+	avatarUrl: string | undefined;
 	hfUserId: string;
 }

src/routes/login/callback/updateUser.ts

@@ -18,6 +18,12 @@ export async function updateUser(params: {
 }) {
 	const { userData, locals, cookies, userAgent, ip } = params;
 
+	// Microsoft Entra v1 tokens do not provide preferred_username, instead the username is provided in the upn
+	// claim. See https://learn.microsoft.com/en-us/entra/identity-platform/access-token-claims-reference
+	if (!userData.preferred_username && userData.upn) {
+		userData.preferred_username = userData.upn as string;
+	}
+
 	const {
 		preferred_username: username,
 		name,
@@ -28,7 +34,7 @@ export async function updateUser(params: {
 		.object({
 			preferred_username: z.string().optional(),
 			name: z.string(),
-			picture: z.string(),
+			picture: z.string().optional(),
 			sub: z.string(),
 			email: z.string().email().optional(),
 		})