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================================
Taler Wallet Website Integration
================================
Websites (such as banks and online shops) can communicate with
the Taler wallet by a standardized protocol.
From a technical perspective, the Taller wallet communicates with
the website by sending and receiving `DOM events <http://www.w3.org/TR/DOM-Level-3-Events/>`_
on the bank website's ``HTMLDocument``.
DOM events used by Taler have the prefix ``taler-``.
.. _communication:
----------------------
Communication Example
----------------------
The bank website can send the event ``taler-XYZ`` with the event data ``eventData``.
to the wallet with the following JavaScript code:
.. sourcecode:: javascript
const myEvent = new CustomEvent("taler-XYZ", eventData);
document.dispatchEvent(myEvent);
Events can be received by installing a listener:
.. sourcecode:: javascript
function myListener(talerEvent) {
// handle event here!
}
document.addEventListener("taler-XYZ", myListener);
--------------------
Normalized Base URLs
--------------------
Mints and merchants have a base URL for their service. This URL *must* be in a
canonical form when it is stored (e.g. in the wallet's database) or transmitted
(e.g. to a bank page).
1. The URL must be absolute. This implies that the URL has a schema.
2. The path component of the URL must end with a slash.
3. The URL must not contain a fragment or query.
When a user enters a URL that is, technically, relative (such as "alice.example.com/mint"), wallets
*may* transform it into a canonical base URL ("http://alice.example.com/mint/"). Other components *should not* accept
URLs that are not canonical.
Rationale: Joining non-canonical URLs with relative URLs (e.g. "mint.example.com" with "reserve/status")
results in different and slightly unexpected behavior in some URL handling libraries.
Canonical URLs give more predictable results with standard URL joining.
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