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package internal
import (
"net/url"
"regexp"
"strings"
)
const (
defaultHTTPPort = ":80"
defaultHTTPSPort = ":443"
)
// Regular expressions used by the normalizations
var rxPort = regexp.MustCompile(`(:\d+)/?$`)
var rxDupSlashes = regexp.MustCompile(`/{2,}`)
// NormalizeURL will normalize the specified URL
// This was added to replace a previous call to the no longer maintained purell library:
// The call that was used looked like the following:
//
// url.Parse(purell.NormalizeURL(parsed, purell.FlagsSafe|purell.FlagRemoveDuplicateSlashes))
//
// To explain all that was included in the call above, purell.FlagsSafe was really just the following:
// - FlagLowercaseScheme
// - FlagLowercaseHost
// - FlagRemoveDefaultPort
// - FlagRemoveDuplicateSlashes (and this was mixed in with the |)
//
// This also normalizes the URL into its urlencoded form by removing RawPath and RawFragment.
func NormalizeURL(u *url.URL) {
lowercaseScheme(u)
lowercaseHost(u)
removeDefaultPort(u)
removeDuplicateSlashes(u)
u.RawPath = ""
u.RawFragment = ""
}
func lowercaseScheme(u *url.URL) {
if len(u.Scheme) > 0 {
u.Scheme = strings.ToLower(u.Scheme)
}
}
func lowercaseHost(u *url.URL) {
if len(u.Host) > 0 {
u.Host = strings.ToLower(u.Host)
}
}
func removeDefaultPort(u *url.URL) {
if len(u.Host) > 0 {
scheme := strings.ToLower(u.Scheme)
u.Host = rxPort.ReplaceAllStringFunc(u.Host, func(val string) string {
if (scheme == "http" && val == defaultHTTPPort) || (scheme == "https" && val == defaultHTTPSPort) {
return ""
}
return val
})
}
}
func removeDuplicateSlashes(u *url.URL) {
if len(u.Path) > 0 {
u.Path = rxDupSlashes.ReplaceAllString(u.Path, "/")
}
}
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