matrix-spec-proposals/content/client-server-api/modules/search.md

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Server Side Search

The search API allows clients to perform full text search across events in all rooms that the user has been in, including those that they have left. Only events that the user is allowed to see will be searched, e.g. it won't include events in rooms that happened after you left.

Client behaviour

There is a single HTTP API for performing server-side search, documented below.

{{% http-api spec="client-server" api="search" %}}

Search Categories

The search API allows clients to search in different categories of items. Currently the only specified category is room_events.

room_events

This category covers all events that the user is allowed to see, including events in rooms that they have left. The search is performed on certain keys of certain event types.

The supported keys to search over are:

• content.body in m.room.message
• content.name in m.room.name
• content.topic in m.room.topic

The search will not include rooms that are end to end encrypted.

The results include a rank key that can be used to sort the results by relevancy. The higher the rank the more relevant the result is.

The value of count gives an approximation of the total number of results. Homeservers may give an estimate rather than an exact value for this field.

Ordering

The client can specify the ordering that the server returns results in. The two allowed orderings are:

• rank, which returns the most relevant results first.
• recent, which returns the most recent results first.

The default ordering is rank.

Groups

The client can request that the results are returned along with grouping information, e.g. grouped by room_id. In this case the response will contain a group entry for each distinct value of room_id. Each group entry contains at least a list of the event_ids that are in that group, as well as potentially other metadata about the group.

The current required supported groupings are:

• room_id
• sender

Pagination

The server may return a next_batch key at various places in the response. These are used to paginate the results. To fetch more results, the client should send the same request to the server with a next_batch query parameter set to that of the token.

The scope of the pagination is defined depending on where the next_batch token was returned. For example, using a token inside a group will return more results from within that group.

The currently supported locations for the next_batch token are:

• search_categories.<category>.next_batch
• search_categories.<category>.groups.<group_key>.<group_id>.next_batch

A server need not support pagination, even if there are more matching results. In that case, they must not return a next_batch token in the response.

Security considerations

The server must only return results that the user has permission to see.