support matrix.to links (#1849)

* support room via server params and eventId

* change copy link to matrix.to links

* display matrix.to links in messages as pill and stop generating url previews for them

* improve editor mention to include viaServers and eventId

* fix mention custom attributes

* always try to open room in current space

* jump to latest remove target eventId from url

* add create direct search options to open/create dm with url

src/app/plugins/matrix-to.ts

@@ -0,0 +1,84 @@
+const MATRIX_TO_BASE = 'https://matrix.to';
+
+export const getMatrixToUser = (userId: string): string => `${MATRIX_TO_BASE}/#/${userId}`;
+
+const withViaServers = (fragment: string, viaServers: string[]): string =>
+  `${fragment}?${viaServers.map((server) => `via=${server}`).join('&')}`;
+
+export const getMatrixToRoom = (roomIdOrAlias: string, viaServers?: string[]): string => {
+  let fragment = roomIdOrAlias;
+
+  if (Array.isArray(viaServers) && viaServers.length > 0) {
+    fragment = withViaServers(fragment, viaServers);
+  }
+
+  return `${MATRIX_TO_BASE}/#/${fragment}`;
+};
+
+export const getMatrixToRoomEvent = (
+  roomIdOrAlias: string,
+  eventId: string,
+  viaServers?: string[]
+): string => {
+  let fragment = `${roomIdOrAlias}/${eventId}`;
+
+  if (Array.isArray(viaServers) && viaServers.length > 0) {
+    fragment = withViaServers(fragment, viaServers);
+  }
+
+  return `${MATRIX_TO_BASE}/#/${fragment}`;
+};
+
+export type MatrixToRoom = {
+  roomIdOrAlias: string;
+  viaServers?: string[];
+};
+
+export type MatrixToRoomEvent = MatrixToRoom & {
+  eventId: string;
+};
+
+const MATRIX_TO = /^https?:\/\/matrix\.to\S*$/;
+export const testMatrixTo = (href: string): boolean => MATRIX_TO.test(href);
+
+const MATRIX_TO_USER = /^https?:\/\/matrix\.to\/#\/(@[^:\s]+:[^?/\s]+)\/?$/;
+const MATRIX_TO_ROOM = /^https?:\/\/matrix\.to\/#\/([#!][^:\s]+:[^?/\s]+)\/?(\?[\S]*)?$/;
+const MATRIX_TO_ROOM_EVENT =
+  /^https?:\/\/matrix\.to\/#\/([#!][^:\s]+:[^?/\s]+)\/(\$[^?/\s]+)\/?(\?[\S]*)?$/;
+
+export const parseMatrixToUser = (href: string): string | undefined => {
+  const match = href.match(MATRIX_TO_USER);
+  if (!match) return undefined;
+  const userId = match[1];
+  return userId;
+};
+
+export const parseMatrixToRoom = (href: string): MatrixToRoom | undefined => {
+  const match = href.match(MATRIX_TO_ROOM);
+  if (!match) return undefined;
+
+  const roomIdOrAlias = match[1];
+  const viaSearchStr = match[2];
+  const viaServers = new URLSearchParams(viaSearchStr).getAll('via');
+
+  return {
+    roomIdOrAlias,
+    viaServers: viaServers.length === 0 ? undefined : viaServers,
+  };
+};
+
+export const parseMatrixToRoomEvent = (href: string): MatrixToRoomEvent | undefined => {
+  const match = href.match(MATRIX_TO_ROOM_EVENT);
+  if (!match) return undefined;
+
+  const roomIdOrAlias = match[1];
+  const eventId = match[2];
+  const viaSearchStr = match[3];
+  const viaServers = new URLSearchParams(viaSearchStr).getAll('via');
+
+  return {
+    roomIdOrAlias,
+    eventId,
+    viaServers: viaServers.length === 0 ? undefined : viaServers,
+  };
+};