Move permalink host check into permalink constructors

Without the requirement for a room to work

src/utils/permalinks/PermalinkConstructor.js

@@ -34,4 +34,8 @@ export default class PermalinkConstructor {
     forUser(userId: string): string {
         throw new Error("Not implemented");
     }
+
+    isPermalinkHost(host: string): boolean {
+        throw new Error("Not implemented");
+    }
 }

src/utils/permalinks/RoomPermalinkCreator.js

@@ -17,10 +17,7 @@ limitations under the License.
 import MatrixClientPeg from "../../MatrixClientPeg";
 import isIp from "is-ip";
 import utils from 'matrix-js-sdk/lib/utils';
-import SpecPermalinkConstructor, {
-    baseUrl as matrixtoBaseUrl,
-    host as matrixtoHost
-} from "./SpecPermalinkConstructor";
+import SpecPermalinkConstructor from "./SpecPermalinkConstructor";
 import PermalinkConstructor from "./PermalinkConstructor";
 
 const SdkConfig = require("../../SdkConfig");
@@ -127,10 +124,6 @@ export class RoomPermalinkCreator {
         return this._started;
     }
 
-    isPermalinkHost(host: string): boolean {
-        return host === matrixtoHost;
-    }
-
     forEvent(eventId) {
         return getPermalinkConstructor().forEvent(this._roomId, eventId, this._serverCandidates);
     }
@@ -285,6 +278,10 @@ export function makeGroupPermalink(groupId) {
     return getPermalinkConstructor().forGroup(groupId);
 }
 
+export function isPermalinkHost(host: string): boolean {
+    return getPermalinkConstructor().isPermalinkHost(host);
+}
+
 function getPermalinkConstructor(): PermalinkConstructor {
     if (SdkConfig.get()['useRiotToCreatePermalinks']) {
         // TODO: Return a RiotPermalinkConstructor

src/utils/permalinks/SpecPermalinkConstructor.js

@@ -43,6 +43,10 @@ export default class SpecPermalinkConstructor extends PermalinkConstructor {
         return `${baseUrl}/#/${groupId}`;
     }
 
+    isPermalinkHost(testHost: string): boolean {
+        return testHost === host;
+    }
+
     encodeServerCandidates(candidates: string[]) {
         if (!candidates || candidates.length === 0) return '';
         return `?via=${candidates.map(c => encodeURIComponent(c)).join("&via=")}`;