Provide JSON API for search

[jancborchardt]

(Reopening your issue here because we moved development @stefan-niedermann :)

There should be an API for searching for addresses.
Otherwise every client would have to implement searching in contacts etc. itself. Providing an API would save every client much work.

This should be read as "WiP", just brainstorming.

Request

GET /search?q=<string>

Response

Nextcloud Maps should search all reachable information in the Nextcloud (especially from Nextcloud Contacts, but maybe from Nextcloud Calendar - Meetings in the near future?). And it should search osm via nominatim to get PoIs.
Mimetype: application/json

{
  /* Contacts from contacts app */
  contacts : [
	  {
		firstname : <string>,
		lastname : <string>,
		address : {
		  nr : <int>,
		  street : <string>,
		  plz : <int>,
		  city : <string>
		},
		lat : <int>,
		long : <int>
	  },
	  ...
  ],
  /* Points of Interest (bars, clubs, toilets, buildings, ...) */
  poi : [
      {
        title : <string>,
        type : <string>, /* Enum? */
		address : {
		  nr : <int>,
		  street : <string>,
		  plz : <int>,
		  city : <string>
		},
        lat : <int>,
        long : <int>
      },
      ...
  ],
  /* Addresses from OSM search */
  addresses : [
    {
      /* Whatever the OSM JSON-API delivers ;-) */
    },
    ...
  ]
}

[tacruc]

@eneiluj What do you think of this?

[julien-nc]

That would be very nice and not so hard to implement. Let's keep it open. I'll probably do it in the summer.