diff --git a/src/BanList.ts b/src/BanList.ts
new file mode 100644
index 0000000..2158c9e
--- /dev/null
+++ b/src/BanList.ts
@@ -0,0 +1,40 @@
+/*
+Copyright 2019 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { MatrixClient, Permalinks } from "matrix-bot-sdk";
+
+export default class BanList {
+    private viaServers: string[] = [];
+
+    constructor(private roomRef: string, private client: MatrixClient) {
+        if (this.roomRef.startsWith("https")) {
+            const parts = Permalinks.parseUrl(this.roomRef);
+            this.roomRef = parts.roomIdOrAlias;
+
+            if (parts.viaServers) this.viaServers = parts.viaServers;
+        }
+
+        client.resolveRoom(this.roomRef).then(roomId => this.roomRef = roomId);
+    }
+
+    public async ensureJoined(): Promise<void> {
+        await this.client.joinRoom(this.roomRef, this.viaServers);
+    }
+
+    // TODO: Update list
+    // TODO: Match checking
+
+}
diff --git a/src/ListRule.ts b/src/ListRule.ts
new file mode 100644
index 0000000..126894a
--- /dev/null
+++ b/src/ListRule.ts
@@ -0,0 +1,30 @@
+/*
+Copyright 2019 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+export const RECOMMENDATION_BAN = "m.ban";
+export const RECOMMENDATION_BAN_TYPES = [RECOMMENDATION_BAN, "org.matrix.mjolnir.ban"];
+
+export class ListRule {
+    constructor(public entity: string, private action: string, public reason: string) {
+        // TODO: Convert entity to regex
+    }
+
+    public get recommendation(): string {
+        if (RECOMMENDATION_BAN_TYPES.includes(this.action)) return RECOMMENDATION_BAN;
+    }
+
+    // TODO: Match checking functions
+}