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// SPDX-License-Identifier: AGPL-3.0-only
// SPDX-FileCopyrightText: Copyright (c) 2025 Runxi Yu <https://runxiyu.org>
package misc
import (
"net/http"
"net/url"
"strings"
)
// ParseReqURI parses an HTTP request URL, and returns a slice of path segments
// and the query parameters. It handles %2F correctly.
func ParseReqURI(requestURI string) (segments []string, params url.Values, err error) {
path, paramsStr, _ := strings.Cut(requestURI, "?")
segments, err = PathToSegments(path)
if err != nil {
return
}
params, err = url.ParseQuery(paramsStr)
return
}
// PathToSegments splits a path into unescaped segments. It handles %2F correctly.
func PathToSegments(path string) (segments []string, err error) {
segments = strings.Split(strings.TrimPrefix(path, "/"), "/")
for i, segment := range segments {
segments[i], err = url.PathUnescape(segment)
if err != nil {
return
}
}
return
}
// RedirectDir returns true and redirects the user to a version of the URL with
// a trailing slash, if and only if the request URL does not already have a
// trailing slash.
func RedirectDir(writer http.ResponseWriter, request *http.Request) bool {
requestURI := request.RequestURI
pathEnd := strings.IndexAny(requestURI, "?#")
var path, rest string
if pathEnd == -1 {
path = requestURI
} else {
path = requestURI[:pathEnd]
rest = requestURI[pathEnd:]
}
if !strings.HasSuffix(path, "/") {
http.Redirect(writer, request, path+"/"+rest, http.StatusSeeOther)
return true
}
return false
}
// RedirectNoDir returns true and redirects the user to a version of the URL
// without a trailing slash, if and only if the request URL has a trailing
// slash.
func RedirectNoDir(writer http.ResponseWriter, request *http.Request) bool {
requestURI := request.RequestURI
pathEnd := strings.IndexAny(requestURI, "?#")
var path, rest string
if pathEnd == -1 {
path = requestURI
} else {
path = requestURI[:pathEnd]
rest = requestURI[pathEnd:]
}
if strings.HasSuffix(path, "/") {
http.Redirect(writer, request, strings.TrimSuffix(path, "/")+rest, http.StatusSeeOther)
return true
}
return false
}
// RedirectUnconditionally unconditionally redirects the user back to the
// current page while preserving query parameters.
func RedirectUnconditionally(writer http.ResponseWriter, request *http.Request) {
requestURI := request.RequestURI
pathEnd := strings.IndexAny(requestURI, "?#")
var path, rest string
if pathEnd == -1 {
path = requestURI
} else {
path = requestURI[:pathEnd]
rest = requestURI[pathEnd:]
}
http.Redirect(writer, request, path+rest, http.StatusSeeOther)
}
// SegmentsToURL joins URL segments to the path component of a URL.
// Each segment is escaped properly first.
func SegmentsToURL(segments []string) string {
for i, segment := range segments {
segments[i] = url.PathEscape(segment)
}
return strings.Join(segments, "/")
}
// AnyContain returns true if and only if ss contains a string that contains c.
func AnyContain(ss []string, c string) bool {
for _, s := range ss {
if strings.Contains(s, c) {
return true
}
}
return false
}
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