feat(server): add an embedded ACME directory server and certificate authority with challenge, order, and certificate endpoints

ts_server/server.classes.account.store.ts

@@ -0,0 +1,27 @@
+import type { IServerAccountStore, IServerAccount } from './server.interfaces.js';
+
+/**
+ * In-memory account storage for the ACME server.
+ */
+export class MemoryAccountStore implements IServerAccountStore {
+  private accounts = new Map<string, IServerAccount>();
+  private byThumbprint = new Map<string, string>();
+  private byUrl = new Map<string, string>();
+
+  async create(account: IServerAccount): Promise<IServerAccount> {
+    this.accounts.set(account.id, account);
+    this.byThumbprint.set(account.thumbprint, account.id);
+    this.byUrl.set(account.url, account.id);
+    return account;
+  }
+
+  async getByThumbprint(thumbprint: string): Promise<IServerAccount | null> {
+    const id = this.byThumbprint.get(thumbprint);
+    return id ? this.accounts.get(id) || null : null;
+  }
+
+  async getByUrl(url: string): Promise<IServerAccount | null> {
+    const id = this.byUrl.get(url);
+    return id ? this.accounts.get(id) || null : null;
+  }
+}