remove outdated docs, docs now are in docs.git
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Florian Dold
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This file is part of GNU TALER.
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Copyright (C) 2014, 2015, 2016 INRIA
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2.1, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along with
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TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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@author Florian Dold
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=====================
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WebExtensions Wallet
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=====================
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------------
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Introduction
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------------
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The WebExtensions Wallet (*wxwallet*) can be used to pay with GNU Taler on web
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sites from within modern web browsers. The `WebExtensions
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<https://wiki.mozilla.org/WebExtensions>`_ API enables the development of
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cross-browser extensions. Google Chrome / Chromium, Mozilla Firefox, Opera and
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Microsoft Edge will all offer support for WebExtensions and thus be able to support Taler.
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Currently Chrome hast the best support for WebExtensions (since the API is a
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superset of Chrome's extension API).
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-----------------------
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Development Environment
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-----------------------
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The *wxwallet* mainly written in the `TypeScript
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<http://www.typescriptlang.org/>`_ language, which is a statically typed
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superset of JavaScript.
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While the *wxwallet* is mainly intended to be run from inside a browser, the
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logic is implemented in browser-independent modules that can also be called
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from other environments such as `nodejs <https://nodejs.org>`_. This is
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especially useful for automatically running unit tests.
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-----------------
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Project Structure
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-----------------
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.. parsed-literal::
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**manifest.json** extension configuration
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**package.json** node.js package configuration
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**tsconfig.json** TypeScript compiler configuration
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**gulpfile.js** Build tasks script
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**lib/**
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**vendor/** 3rd party libraries
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**wallet/** actual application logic
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**emscripten/** emscripten object file and glue
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**test/**
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**run_tests.js** nodejs entry point for tests
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**tests/** test cases
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**content_scripts/notify.ts** wallet<->website signaling
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**backgrond/main.ts** backend entry point
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**img/** static image resources
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**style/** CSS stylesheets
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**pages/** pages shown in browser tabs
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**popup/** pages shown the extension popup
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-------------------
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Building the Wallet
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-------------------
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To build the extension for use during development, simply run the TypeScript compiler
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from the extension directory:
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.. code-block:: sh
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$ cd wallet.git/wallet_webextension/extension/
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$ tsc
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This will use the ``tsconfig.json`` with development options such as `source map`_ support.
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.. _`source map`: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit
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When TypeScript source files are added or deleted to the project, make sure that the
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globs in ``gulpfile.js`` match them so that they will be compiled. The ``tsconfig.json``
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is generated by running:
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.. code-block:: sh
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$ gulp tsconfig
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.. caution::
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Do not edit the ``tsconfig.json`` manually. The source files should be defined in
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one place, and that is ``gulpfile.js``.
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To pack the extension in a format that can be uploaded to the Google Webstore, run:
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.. code-block:: sh
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$ gulp package
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This will build the wallet without source maps, copy resource files (which also need to be
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specified in ``gulpfile.js``) and create an archive.
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----------
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Emscripten
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----------
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`Emscripten <https://kripken.github.io/emscripten-site/index.html>`_ is C/C++
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to JavaScript compiler. Emscripten is used in the *wxwallet* to access
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low-level cryptography from *libgcrypt*, and miscellaneous functionality from
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*libgnunetutil* and *libtalerwallet*.
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TODO: say things about wrappers
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--------------------------------------
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Target Environments and Modularization
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--------------------------------------
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Modules in the wallet are declared in TypeScript with
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the ES6 module syntax. These modules are then compiled
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to `SystemJS <https://github.com/systemjs/systemjs>`_ `register` modules.
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SystemJS modules can be loaded from the browser as well as from nodejs.
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However they require special entry points that configure the module system,
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load modules and execute code. Examples are `backgrond/main.ts` for the
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browser and `test/run_tests.js` for nodejs.
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Note that special care has to be taken when loading the Emscript code,
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as it is not compatible with the SystemJS module, even in the `globals`
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compatibility mode.
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The TypeScript sources in the *wxwallet* are compiled down to ES5, both to
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enable running in node.js without transpilers and to avoid a `bug
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<https://github.com/Microsoft/TypeScript/issues/6426>`_ in the TypeScript
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compiler.
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----------------------------
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IndexedDB Query Abstractions
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----------------------------
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The *wxwallet* uses a fluent-style API for queries on IndexedDB.
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TODO: say more about this
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-------
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Testing
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-------
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Test cases for the wallet are written in TypeScript and
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run with `mochajs <http://mochajs.org/>`_ and the `better-assert <https://github.com/tj/better-assert>`_ assertion
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library.
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Run the default test suite with ``npm run test``, which will
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call `mocha` with the right parameters.
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--------------------
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Internationalisation
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--------------------
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Strings in the JavaScript code are internationalised using the following functions:
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- *i18n*: translate string with arbitrary arguments, the result is returned as string.
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.. code-block:: js
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i18n`You have ${n} coins.`
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- *i18n.parts*: Interpolate i18nized values with arbitrary objects.
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Useful for example to include HTML elements.
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.. code-block:: js
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i18n.parts`Visit ${link} to get more coins.`
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- *i18n.pluralize*: translate with plural form.
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The i18n.number() function returns a ``PluralNumber`` object
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that specifies the argument that determines the plural form,
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if not present the first numeric argument is used.
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.. code-block:: js
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i18n.pluralize(
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i18n`${i}: you have ${i18n.number(n)} coin.`,
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`${i}: you have ${i18n.number(n)} coins.`);
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These functions are defined in ``lib/i18n.ts``.
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Include ``lib/vendor/jed.js``, ``lib/i18n.js``, ``lib/i18n-strings.js`` to use them.
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To extract strings from sources and update the .po files, run:
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.. code-block:: sh
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$ make i18n
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In static HTML files the ``lang`` attribute is used for language-specific strings:
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.. code-block:: html
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<p lang="en">Hello World!</p>
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<p lang="de">Hallo Welt!</p>
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``lib/i18n.js`` and ``style/lang.css`` needs to be included for this to work.
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