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4b397670a4
moonfire-nvr/guide/developing-ui.md
Scott Lamb 4b397670a4 revamp webpack config 
* simplify it. Go from six checked-in config files + one local one to
  three checked-in configs + commandline options. I find it less
  confusing to have the options plumbed through fewer layers.

* support developing against a https production server, as described in
  guide/developing-ui.md.

* fix the source map. The sourceMap parameter in prod.config.js as far
  as I can tell evaluated to false when run with production config, and
  anyway UglifyJS seems to be incompatible with the specified
  cheap-module-source-map. Use source-map instead.
2020-03-01 19:26:45 -08:00

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Working on UI development

The UI is presented from a single HTML page (index.html) and any number of Javascript files, css files, images, etc. These are "packed" together using webpack.

For ongoing development it is possible to have the UI running in a web browser using "hot loading". This means that as you make changes to source files, they will be detected, the webpack will be recompiled and generated and then the browser will be informed to reload things. In combination with the debugger built into modern browsers this makes for a reasonable process.

For a production build, the same process is followed, except with different settings. In particular, no hot loading development server will be started and more effort is expended on packing and minimizing the components of the application as represented in the various "bundles". Read more about this in the webpack documentation.

Getting started

Checkout the branch you want to work on and type

$ yarn start

This will pack and prepare a development setup. By default the development server that serves up the web page(s) will listen on http://localhost:3000/ so you can direct your browser there. It assumes the Moonfire NVR server is running at http://localhost:8080/ and will proxy API requests there.

Make any changes to the source code as you desire (look at existing code for examples and typical style), and the browser will hot-load your changes. Often times you will make mistakes. Anything from a coding error (for which you can use the browser's debugger), or compilation breaking Javascript errors. The latter will often be reported as errors during the webpack assembly process, but some will show up in the browser console, or both.

Overriding defaults

The configuration understands these environment variables:

variable description default
MOONFIRE_URL base URL of the backing Moonfire NVR server http://localhost:8080/
MOONFIRE_DEV_PORT port to listen on 3000
MOONFIRE_DEV_HOST base URL of the backing Moonfire NVR server localhost (1)

(1) Moonfire NVR's webpack/dev.config.js has no default value for MOONFIRE_DEV_HOST. webpack-dev-server itself has a default of localhost, as described here.

Thus one could connect to a remote Moonfire NVR by specifying its URL as follows:

$ MOONFIRE_URL=https://nvr.example.com/ yarn start

This allows you to test a new UI against your stable, production Moonfire NVR installation with real data.

The default MOONFIRE_DEV_HOST is suitable for connecting to the proxy server from a browser running on the same machine. If you want your server to be externally accessible, you may want to bind to 0.0.0.0 instead:

$ MOONFIRE_DEV_HOST=0.0.0.0 yarn start

Be careful, though: it's insecure to send your production credentials over a non-https connection, as described more below.

A note on https

Commonly production setups require credentials and run over https, as described in secure.md. Furthermore, Moonfire NVR will set the secure attribute on cookies it receives over https, so that the browser will only send them over a https connection.

This is great for security and somewhat inconvenient for proxying. Fundamentally, there are three ways to make it work:

  1. Configure the proxy server with valid credentials to supply on every request, without requiring the browser to authenticate.
  2. Configure the proxy server to strip out the secure attribute from cookie response headers, so the browser will send them to the proxy server.
  3. Configure the proxy server with a TLS certificate. a. using a self-signed certificate manually added to the browser's store. b. using a certificate from a "real" Certificate Authority (such as letsencrypt).

Currently the configuration only implements method 2. It's easy to configure but has a couple caveats:

  • if you alternate between proxying to a test Moonfire NVR installation and a real one, your browser won't know the difference. It will supply whichever credentials were sent to it last.
  • if you connect via a host other than localhost (and set MOONFIRE_DEV_HOST to allow this), your browser will have a production cookie that it's willing to send to a remote host over a non-https connection. If you ever load this website using an untrustworthy DNS server, your credentials can be compromised.

We might add support for method 3 in the future. It's less convenient to configure but can avoid these problems.