40 lines
1.9 KiB
Markdown
40 lines
1.9 KiB
Markdown
# matrix.to permalink navigation
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Currently Matrix uses matrix.to URIs to reference rooms and other entities in a
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permanent manner. With just a room ID, users can't get into rooms if their server
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is not already aware of the room. This makes permalinks to rooms or events difficult
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as the user won't actually be able to join. A matrix.to link generated using a
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room's alias is not a permanent link due to aliases being transferable.
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In lieu of an improved way to reference entities permanently in Matrix, a new parameter
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is to be added to matrix.to URIs to assist clients and servers receiving permanent links
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in joining the room.
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For reference, existing permalinks look like this:
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```
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https://matrix.to/#/!somewhere:example.org
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https://matrix.to/#/!somewhere:example.org/$something:example.org
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```
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By adding a new parameter to the end, receivers can more easily join the room:
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```
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https://matrix.to/#/!somewhere:example.org?via=example-1.org&via=example-2.org
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https://matrix.to/#/!somewhere:example.org/$something:example.org?via=example-1.org&via=example-2.org
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```
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Clients can pass the servers directly to `/join` in the form of `server_name`
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parameters.
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When generating the permalinks, clients should pick servers that have a reasonably
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high chance of being in the room in the distant future. The current recommendation
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is to pick up to 3 unique servers where the first one is that of the user with the
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highest power level in the room, provided that power level is 50 or higher. The other
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2 servers should be the most popular servers in the room based on the number of joined
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users. This same heuristic should apply to the first server if no user meets the power
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level requirements. Servers blocked by server ACLs should not be picked because they
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are unlikely to continue being residents of the room. Similarly, IP addresses should
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not be picked because they cannot be redirected to another location like domain names
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can, making them a higher risk option.
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