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8cc2d01caa
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>
47 lines
1.3 KiB
Go
47 lines
1.3 KiB
Go
package http
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import (
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"embed"
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"fmt"
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"html/template"
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"net/http"
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"github.com/Masterminds/sprig/v3"
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"github.com/gofiber/fiber/v2"
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fiberhtml "github.com/gofiber/template/html/v2"
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"github.com/microcosm-cc/bluemonday"
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"github.com/mudler/LocalAI/core/http/utils"
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"github.com/mudler/LocalAI/core/schema"
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"github.com/russross/blackfriday"
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)
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//go:embed views/*
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var viewsfs embed.FS
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func notFoundHandler(c *fiber.Ctx) error {
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// Check if the request accepts JSON
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if string(c.Context().Request.Header.ContentType()) == "application/json" || len(c.Accepts("html")) == 0 {
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// The client expects a JSON response
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return c.Status(fiber.StatusNotFound).JSON(schema.ErrorResponse{
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Error: &schema.APIError{Message: "Resource not found", Code: fiber.StatusNotFound},
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})
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} else {
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// The client expects an HTML response
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return c.Status(fiber.StatusNotFound).Render("views/404", fiber.Map{
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"BaseURL": utils.BaseURL(c),
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})
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}
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}
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func renderEngine() *fiberhtml.Engine {
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engine := fiberhtml.NewFileSystem(http.FS(viewsfs), ".html")
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engine.AddFuncMap(sprig.FuncMap())
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engine.AddFunc("MDToHTML", markDowner)
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return engine
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}
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func markDowner(args ...interface{}) template.HTML {
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s := blackfriday.MarkdownCommon([]byte(fmt.Sprintf("%s", args...)))
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return template.HTML(bluemonday.UGCPolicy().Sanitize(string(s)))
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}
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