support custom .JS and .CSS files for custom banner messages (white-labeling) (#1781)

This PR introduces two new server configuration options, for providing a
custom .JS and .CSS file.
These can be used to show custom banner messages, add
environment-dependent signals, or simply a corporate logo.

### Motivation (what problem I try to solve)

I'm operating Woodpecker in multiple k8s clusters for different
environments.
When having multiple browser tabs open, I prefer strong indicators for
each environment.
E.g. a red "PROD" banner, or just a blue "QA" banner.
Also, we sometimes need to have the chance for maintenance, and instead
of broadcasting emails,
I prefer a banner message, stating something like: "Heads-up: there's a
planned downtime, next Friday, blabla...".

Also, I like to have the firm's logo visible, which makes Woodpecker
look more like an integral part of our platform.

### Implementation notes

* Two new config options are introduced ```WOODPECKER_CUSTOM_CSS_FILE```
and ```WOODPECKER_CUSTOM_JS_FILE```
* I've piggy-bagged the existing handler for assets, as it seemed to me
a minimally invasive approach
* the option along with an example is documented
* a simple unit test for the Gin-handler ensures some regression safety
* no extra dependencies are introduced

### Visual example

The documented example will look like this.

![Screenshot 2023-05-27 at 17 00
44](https://github.com/woodpecker-ci/woodpecker/assets/1189394/8940392e-463c-4651-a1eb-f017cd3cd64d)

### Areas of uncertainty 

This is my first contribution to Woodpecker and I tried my best to align
with your conventions.
That said, I found myself uncertain about these things and would be glad
about getting feedback.

* The handler tests are somewhat different than the other ones because I
wanted to keep them simple - I hope that still matches your coding
guidelines
* caching the page sometimes will let the browser not recognize changes
and a user must reload. I'm not fully into the details of how caching is
implemented and neither can judge if it's a real problem. Another pair
of eyes would be good.
This commit is contained in:
Martin W. Kirst
2023-07-10 12:46:35 +02:00
committed by GitHub
parent f2c33a0d89
commit 2c1fc4b500
7 changed files with 167 additions and 1 deletions

View File

@@ -7,10 +7,12 @@
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta name="theme-color" content="#65a30d" />
<title>Woodpecker</title>
<link rel="stylesheet" href="/assets/custom.css" />
<script type="" src="/web-config.js"></script>
</head>
<body>
<div id="app"></div>
<script type="module" src="/src/main.ts"></script>
<script type="application/javascript" src="/assets/custom.js"></script>
</body>
</html>