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38 lines
1.8 KiB
Markdown
38 lines
1.8 KiB
Markdown
# Developing this module
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To work on this module, it's necessary to use either
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[yarn](https://yarnpkg.com/) or [npm](https://www.npmjs.com/). Yarn is an
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alternative to npm by Facebook, but they perform the same function here.
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When run in the parent directory, `stack build` will run a build script in the
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root to install any dependencies and build the output bundle.
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# Motivation for this module
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The situation for handling client-side CSRF token injection was unsatisfying, to
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say the least. Without performing significant surgery on the types and method
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the Guide uses to generate JavaScript functions, our best option is to modify
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the jQuery `$.ajax()` or `$.post()` functions.
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There are a grand total of four packages on [npmjs.com](https://npmjs.com) that
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show up for "jquery csrf". The most promising is `jquery-csrf-token`. It has two
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problems, one technical and one contextual.
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1. It does not filter based on the URL, it is a shotgun. Not knowing a lot about
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how Spock generates and validates CSRF tokens or how that could change, we
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should defensively program around the worst case: CSRF tokens are valid for a
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really long time beyond a user's session, and leaking one could be bad.
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2. It gets ~40 downloads a month. Let's not let ourselves be `left-pad`ed.
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So we will include the source (it's relatively short) and add the modifications
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we need, and _also_ provide a nice path forward for building a
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single-source-of-truth for client JavaScript for the project. Since
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`jquery-csrf-token` uses [Rollup](http://rollupjs.org/), we will too.
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We will also use URL parsing to make sure that we only send the CSRF token to
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the a relative URI. Rollup will come in handy here because IE11 (ugh) and Opera
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Mini (what?) do not support the URL API and so we'll polyfill it.
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Other features may be added as needed and will be documented here.
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