Simple static location sharing (#19754)

Adds static location share a la [MSC3488](https://github.com/matrix-org/matrix-doc/pull/3488) behind a labs flag, supporting legacy `m.location` `msgtype` too.  Powered by https://github.com/matrix-org/matrix-react-sdk/pull/7135.  Adds maplibre as a dependency.

To make this work, you have to add a valid `map_style_url` to your config.json.

docs/config.md

@@ -152,6 +152,8 @@ For a good example, see https://develop.element.io/config.json.
 1. `sentry`: [Sentry](https://sentry.io/) configuration for rageshake data being sent to sentry.
    1. `dsn`: the Sentry [DSN](https://docs.sentry.io/product/sentry-basics/dsn-explainer/)
    2. `environment`: (optional) The [Environment](https://docs.sentry.io/product/sentry-basics/environments/) to pass to sentry
+1. `map_style_url`: Maptile server URL for location sharing. e.g.
+   'https://api.maptiler.com/maps/basic/style.json?key=YOUR_KEY_GOES_HERE'
 1. `analyticsOwner`: The entity that analytics data is being sent to. Used in copy
    when explaining to the user where data is being sent. If not set, defaults to `brand`.
 

docs/labs.md

@@ -151,6 +151,19 @@ entirely incomplete and may not work at all - it is not recommended for general
 Metaspaces are automatically populated spaces you can enable in your Space panel.
 By default, you'll have Home or All rooms, but you can opt in to a People, Favourites, and Other Rooms metaspace too.
 
+## Location sharing (`feature_location_share`) [In Development]
+
+Allows users to send and display location data using [maplibre](https://maplibre.org).
+
+The current implementation is a quick in-progress development spike to
+demonstrate viability and prove [MSC3488](https://github.com/matrix-org/matrix-doc/pull/3488)
+and [MSC3489](https://github.com/matrix-org/matrix-doc/pull/3489) - **the UI has not yet
+been designed, and it will not exit labs until it has**.
+
+For this to work, you must specify a valid maptiler.com API key in
+`"map_style_url": "https://api.maptiler.com/maps/basic/style.json?key=YOUR_KEY_GOES_HERE"`
+in your config.json, or find an alternative map tile server.
+
 ## Breadcrumbs v2 (`feature_breadcrumbs_v2`)
 
 Instead of showing the horizontal list of breadcrumbs under the filter field, the new UX is an interactive context menu

src/vector/index.html

@@ -32,7 +32,7 @@
         font-src 'self' data:;
         media-src * blob: data:;
         child-src * blob: data:;
-        worker-src 'self';
+        worker-src 'self' blob:;
         frame-src * blob: data:;
         form-action 'self';
         manifest-src 'self';

test/jest-mocks.js

@@ -12,3 +12,6 @@ Object.defineProperty(window, 'matchMedia', {
         dispatchEvent: jest.fn(),
     })),
 });
+
+// maplibre requires a createObjectURL mock
+global.URL.createObjectURL = jest.fn();