move ProtocolManager into its own unit

cvmts/src/protocol/Manager.ts

@@ -0,0 +1,27 @@
+import { IProtocol } from "./Protocol";
+import { User } from "../User";
+
+// The protocol manager. Holds protocol factories, and provides the ability
+// to create a protocol by name. Avoids direct dependency on a given list of protocols,
+// and allows (relatively simple) expansion.
+export class ProtocolManager {
+	private protocols = new Map<String, () => IProtocol>();
+
+	// Registers a protocol with the given name.
+	registerProtocol(name: string, protocolFactory: () => IProtocol) {
+		if (!this.protocols.has(name)) this.protocols.set(name, protocolFactory);
+	}
+
+	// Creates an instance of a given protocol for a user.
+	createProtocol(name: string, user: User): IProtocol {
+		if (!this.protocols.has(name)) throw new Error(`ProtocolManager does not have protocol \"${name}\"`);
+
+		let factory = this.protocols.get(name)!;
+		let proto = factory();
+		proto.init(user);
+		return proto;
+	}
+}
+
+/// Global protocol manager
+export let TheProtocolManager = new ProtocolManager();