36 lines
986 B
Go
36 lines
986 B
Go
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// SPDX-License-Identifier: AGPL-3.0-or-later
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package middleware
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import (
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"net/http"
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"strings"
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)
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// BasePath strips a configured path prefix from incoming requests so the
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// router sees paths without the prefix. This enables deployment at both
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// faves.example.com (basePath="") and example.com/faves (basePath="/faves").
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func BasePath(prefix string) func(http.Handler) http.Handler {
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return func(next http.Handler) http.Handler {
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if prefix == "" {
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return next
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}
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// Strip the prefix from the URL path.
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if strings.HasPrefix(r.URL.Path, prefix) {
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r.URL.Path = strings.TrimPrefix(r.URL.Path, prefix)
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if r.URL.Path == "" {
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r.URL.Path = "/"
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}
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// Also update RawPath if present.
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if r.URL.RawPath != "" {
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r.URL.RawPath = strings.TrimPrefix(r.URL.RawPath, prefix)
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if r.URL.RawPath == "" {
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r.URL.RawPath = "/"
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}
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}
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}
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next.ServeHTTP(w, r)
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})
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}
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}
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