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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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4
core/http/elements/progressbar.go
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@ -64,7 +64,7 @@ func StartProgressBar(uid, progress, text string) string {
return elem.Div(
attrs.Props{
"hx-trigger": "done",
"hx-get": "/browse/job/" + uid,
"hx-get": "browse/job/" + uid,
"hx-swap": "outerHTML",
"hx-target": "this",
},
@ -77,7 +77,7 @@ func StartProgressBar(uid, progress, text string) string {
},
elem.Text(bluemonday.StrictPolicy().Sanitize(text)), //Perhaps overly defensive
elem.Div(attrs.Props{
"hx-get": "/browse/job/progress/" + uid,
"hx-get": "browse/job/progress/" + uid,
"hx-trigger": "every 600ms",
"hx-target": "this",
"hx-swap": "innerHTML",