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feat(ui): path prefix support via HTTP header (#4497)

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Makes the web app honour the `X-Forwarded-Prefix` HTTP request header that may be sent by a reverse-proxy in order to inform the app that its public routes contain a path prefix.
For instance this allows to serve the webapp via a reverse-proxy/ingress controller under a path prefix/sub path such as e.g. `/localai/` while still being able to use the regular LocalAI routes/paths without prefix when directly connecting to the LocalAI server.

Changes:
* Add new `StripPathPrefix` middleware to strip the path prefix (provided with the `X-Forwarded-Prefix` HTTP request header) from the request path prior to matching the HTTP route.
* Add a `BaseURL` utility function to build the base URL, honouring the `X-Forwarded-Prefix` HTTP request header.
* Generate the derived base URL into the HTML (`head.html` template) as `<base/>` tag.
* Make all webapp-internal URLs (within HTML+JS) relative in order to make the browser resolve them against the `<base/>` URL specified within each HTML page's header.
* Make font URLs within the CSS files relative to the CSS file.
* Generate redirect location URLs using the new `BaseURL` function.
* Use the new `BaseURL` function to generate absolute URLs within gallery JSON responses.

Closes #3095

TL;DR:
The header-based approach allows to move the path prefix configuration concern completely to the reverse-proxy/ingress as opposed to having to align the path prefix configuration between LocalAI, the reverse-proxy and potentially other internal LocalAI clients.
The gofiber swagger handler already supports path prefixes this way, see e2d9e9916d/swagger.go (L79)

Signed-off-by: Max Goltzsche <max.goltzsche@gmail.com>
This commit is contained in:
Max Goltzsche 2025-01-07 17:18:21 +01:00 • committed by GitHub
parent bf37eebecb
commit 8cc2d01caa
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37 changed files with 416 additions and 105 deletions
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32
core/http/views/partials/head.html
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@ -2,33 +2,35 @@
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>{{.Title}}</title>
<base href="{{.BaseURL}}" />
<link rel="icon" type="image/x-icon" href="favicon.ico" />
<link
rel="stylesheet"
href="/static/assets/highlightjs.css"
href="static/assets/highlightjs.css"
/>
<script defer src="/static/assets/highlightjs.js"></script>
<script defer src="static/assets/highlightjs.js"></script>
<script
defer
src="/static/assets/alpine.js"
src="static/assets/alpine.js"
></script>
<script
defer
src="/static/assets/marked.js"
src="static/assets/marked.js"
></script>
<script
defer
src="/static/assets/purify.js"
src="static/assets/purify.js"
></script>
<link href="/static/general.css" rel="stylesheet" />
<link href="/static/assets/font1.css" rel="stylesheet">
<link href="static/general.css" rel="stylesheet" />
<link href="static/assets/font1.css" rel="stylesheet">
<link
href="/static/assets/font2.css"
href="static/assets/font2.css"
rel="stylesheet" />
<link
rel="stylesheet"
href="/static/assets/tw-elements.css" />
<script src="/static/assets/tailwindcss.js"></script>
href="static/assets/tw-elements.css" />
<script src="static/assets/tailwindcss.js"></script>
<script>
tailwind.config = {
darkMode: "class",
@ -54,11 +56,11 @@
});
}
</script>
<link href="/static/assets/fontawesome/css/fontawesome.css" rel="stylesheet" />
<link href="/static/assets/fontawesome/css/brands.css" rel="stylesheet" />
<link href="/static/assets/fontawesome/css/solid.css" rel="stylesheet" />
<script src="/static/assets/flowbite.min.js"></script>
<script src="/static/assets/htmx.js" crossorigin="anonymous"></script>
<link href="static/assets/fontawesome/css/fontawesome.css" rel="stylesheet" />
<link href="static/assets/fontawesome/css/brands.css" rel="stylesheet" />
<link href="static/assets/fontawesome/css/solid.css" rel="stylesheet" />
<script src="static/assets/flowbite.min.js"></script>
<script src="static/assets/htmx.js" crossorigin="anonymous"></script>
<!-- P2P Animation START -->
<style>
.animation-container {