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111 lines
5.6 KiB
ReStructuredText
111 lines
5.6 KiB
ReStructuredText
==============
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WebPayments UI
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==============
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User Interface for the WebPayments `Payment Request API <https://w3c.github.io/browser-payment-api/>`_ and `Payment Handler API <https://w3c.github.io/payment-handler/>`_.
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`Project Wiki <https://wiki.mozilla.org/Firefox/Features/Web_Payments>`_ |
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`#payments on IRC <ircs://irc.mozilla.org:6697/payments>`_ |
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`File a bug <https://bugzilla.mozilla.org/enter_bug.cgi?product=Firefox&component=WebPayments%20UI&status_whiteboard=[webpayments]%20[triage]>`_
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JSDoc style comments are used within the JS files of the component. This document will focus on higher-level and shared concepts.
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.. toctree::
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:maxdepth: 5
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Debugging/Development
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=====================
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Relevant preferences: ``dom.payments.*``
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Must Have Electrolysis
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----------------------
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Web Payments `does not work without e10s <https://bugzilla.mozilla.org/show_bug.cgi?id=1365964>`_!
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Logging
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-------
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Set the pref ``dom.payments.loglevel`` to "Debug" to increase the verbosity of console messages.
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Unprivileged UI Development
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---------------------------
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During development of the unprivileged custom elements, you can load the dialog in a tab with
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the url `resource://payments/paymentRequest.xhtml`.
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You can then use the debugging console to load sample data. Autofill add/edit form strings
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will not appear when developing this way until they are converted to FTL.
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You can force localization of Form Autofill strings using the following in the Browser Console when
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the `paymentRequest.xhtml` tab is selected then reloading::
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gBrowser.selectedBrowser.messageManager.loadFrameScript("chrome://formautofill/content/l10n.js", true)
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Debugging Console
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-----------------
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To open the debugging console in the dialog, use the keyboard shortcut
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**Ctrl-Alt-d (Ctrl-Option-d on macOS)**. While loading `paymentRequest.xhtml` directly in the
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browser, add `?debug=1` to have the debugging console open by default.
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Debugging the unprivileged frame with the developer tools
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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To open a debugger in the context of the remote payment frame, click the "Debug frame" button in the
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debugging console.
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Use the ``tabs`` variable in the Browser Content Toolbox's console to access the frame contents.
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There can be multiple frames loaded in the same process so you will need to find the correct tab
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in the array by checking the file name is `paymentRequest.xhtml` (e.g. ``tabs[0].content.location``).
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Dialog Architecture
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===================
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Privileged wrapper XUL document (paymentDialogWrapper.xul) containing a remote ``<xul:browser="true" remote="true">`` containing unprivileged XHTML (paymentRequest.xhtml).
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Keeping the dialog contents unprivileged is useful since the dialog will render payment line items and shipping options that are provided by web developers and should therefore be considered untrusted.
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In order to communicate across the process boundary a privileged frame script (`paymentDialogFrameScript.js`) is loaded into the iframe to relay messages.
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This is because the unprivileged document cannot access message managers.
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Instead, all communication across the privileged/unprivileged boundary is done via custom DOM events:
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* A ``paymentContentToChrome`` event is dispatched when the dialog contents want to communicate with the privileged dialog wrapper.
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* A ``paymentChromeToContent`` event is dispatched on the ``window`` with the ``detail`` property populated when the privileged dialog wrapper communicates with the unprivileged dialog.
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These events are converted to/from message manager messages of the same name to communicate to the other process.
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The purpose of `paymentDialogFrameScript.js` is to simply convert unprivileged DOM events to/from messages from the other process.
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The dialog depends on the add/edit forms and storage from :doc:`Form Autofill </browser/extensions/formautofill/docs/index>` for addresses and credit cards.
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Communication with the DOM
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--------------------------
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Communication from the DOM to the UI happens via the `paymentUIService.js` (implementing ``nsIPaymentUIService``).
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The UI talks to the DOM code via the ``nsIPaymentRequestService`` interface.
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Custom Elements
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---------------
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The Payment Request UI uses `Custom Elements <https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_custom_elements>`_ for the UI components.
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Some guidelines:
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* There are some `mixins <https://dxr.mozilla.org/mozilla-central/source/browser/components/payments/res/mixins/>`_
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to provide commonly needed functionality to a custom element.
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* `res/containers/ <https://dxr.mozilla.org/mozilla-central/source/browser/components/payments/res/containers/>`_
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contains elements that react to application state changes,
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`res/components/ <https://dxr.mozilla.org/mozilla-central/source/browser/components/payments/res/components>`_
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contains elements that aren't connected to the state directly.
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* Elements should avoid having their own internal/private state and should react to state changes.
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Containers primarily use the application state (``requestStore``) while components primarily use attributes.
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* If you're overriding a lifecycle callback, don't forget to call that method on
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``super`` from the implementation to ensure that mixins and ancestor classes
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work properly.
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* From within a custom element, don't use ``document.getElementById`` or
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``document.querySelector*`` because they can return elements that are outside
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of the component, thus breaking the modularization. It can also cause problems
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if the elements you're looking for aren't attached to the document yet. Use
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``querySelector*`` on ``this`` (the custom element) or one of its descendants
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instead.
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