Extract location utils from components (#8152)

* extract util functions from MLocationBody

Signed-off-by: Kerry Archibald <kerrya@element.io>

* disassemble mlocationbody

Signed-off-by: Kerry Archibald <kerrya@element.io>

* tidy and add copyrights

Signed-off-by: Kerry Archibald <kerrya@element.io>

* move types and utils from components/location to utils

Signed-off-by: Kerry Archibald <kerrya@element.io>

* i18n

Signed-off-by: Kerry Archibald <kerrya@element.io>

* empty line

Signed-off-by: Kerry Archibald <kerrya@element.io>

src/utils/location/locationEventGeoUri.ts

@@ -0,0 +1,31 @@
+/*
+Copyright 2022 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 { MatrixEvent } from "matrix-js-sdk/src/matrix";
+import { M_LOCATION } from "matrix-js-sdk/src/@types/location";
+
+/**
+ * Find the geo-URI contained within a location event.
+ */
+export const locationEventGeoUri = (mxEvent: MatrixEvent): string => {
+    // unfortunately we're stuck supporting legacy `content.geo_uri`
+    // events until the end of days, or until we figure out mutable
+    // events - so folks can read their old chat history correctly.
+    // https://github.com/matrix-org/matrix-doc/issues/3516
+    const content = mxEvent.getContent();
+    const loc = M_LOCATION.findIn(content) as { uri?: string };
+    return loc ? loc.uri : content['geo_uri'];
+};