Add CardDav and CalDav servers (#80)

* Add CardDav and CalDav servers

This implements the servers, but not the clients (yet). The implementation is essentially a proxy to Radicale (as a container in `docker-compose.yml`), with certain security assurances.

If you're upgrading, basically you'll need to create a new `data-radicale` directory, and everything else should just work.

This will also release v2.3.0 with those enabled by default. Tested with Thunderbird and Apple Calendar + Contacts.

To disable these, simply add the new config details and comment out or don't add the new `radicale` service from `docker-compose.yml`.

Related to #56

lib/config.ts

@@ -36,6 +36,14 @@ export class AppConfig {
         host: 'localhost',
         port: 465,
       },
+      contacts: {
+        enableCardDavServer: true,
+        cardDavUrl: 'http://127.0.0.1:5232',
+      },
+      calendar: {
+        enableCalDavServer: true,
+        calDavUrl: 'http://127.0.0.1:5232',
+      },
     };
   }
 
@@ -176,4 +184,16 @@ export class AppConfig {
 
     return this.config.email;
   }
+
+  static async getContactsConfig(): Promise<Config['contacts']> {
+    await this.loadConfig();
+
+    return this.config.contacts;
+  }
+
+  static async getCalendarConfig(): Promise<Config['calendar']> {
+    await this.loadConfig();
+
+    return this.config.calendar;
+  }
 }