[Story] Check room's address for invalid symbols and availability

[mxandreas]

Description

• As a user creating a public room or changing an existing room to be public
• I want to know if the room address is valid (does not have any invalid symbols) and available when I am editing it
• So that I can correct my mistakes instantly; or be happy that the address I desire is available.

Since this a functionality that already exists in EW, the algorithm for checking for invalid symbols and other constraints can be borrowed from EW (or from any other implementation that exists today, as this is not a new problem). For reference: Matrix spec on identifiers.

Same goes for checking if the room address is available - the approach for this can be borrowed from EW and adjusted as necessary.

Designs:

• TODO

Acceptance criteria

• When user types a symbol that is not allowed they get a hint that there are invalid symbols.
• When user corrects their mistakes and the address is valid, the hint for invalid symbols disappers.
• When user enters an address that is valid but not available they get a hint that the address is already in use.
• When user enters an address that is valid and available they get a confirmation that the address is available.

Size estimate

None

Dependencies

• None

Out of scope

• Nothing

Open questions

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Subtasks

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