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76 lines
1.8 KiB
76 lines
1.8 KiB
package v4
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import (
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"net/http"
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"strings"
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)
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// SanitizeHostForHeader removes default port from host and updates request.Host
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func SanitizeHostForHeader(r *http.Request) {
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host := getHost(r)
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port := portOnly(host)
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if port != "" && isDefaultPort(r.URL.Scheme, port) {
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r.Host = stripPort(host)
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}
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}
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// Returns host from request
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func getHost(r *http.Request) string {
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if r.Host != "" {
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return r.Host
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}
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return r.URL.Host
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}
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// Hostname returns u.Host, without any port number.
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//
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// If Host is an IPv6 literal with a port number, Hostname returns the
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// IPv6 literal without the square brackets. IPv6 literals may include
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// a zone identifier.
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//
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// Copied from the Go 1.8 standard library (net/url)
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func stripPort(hostport string) string {
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colon := strings.IndexByte(hostport, ':')
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if colon == -1 {
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return hostport
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}
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if i := strings.IndexByte(hostport, ']'); i != -1 {
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return strings.TrimPrefix(hostport[:i], "[")
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}
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return hostport[:colon]
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}
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// Port returns the port part of u.Host, without the leading colon.
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// If u.Host doesn't contain a port, Port returns an empty string.
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//
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// Copied from the Go 1.8 standard library (net/url)
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func portOnly(hostport string) string {
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colon := strings.IndexByte(hostport, ':')
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if colon == -1 {
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return ""
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}
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if i := strings.Index(hostport, "]:"); i != -1 {
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return hostport[i+len("]:"):]
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}
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if strings.Contains(hostport, "]") {
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return ""
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}
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return hostport[colon+len(":"):]
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}
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// Returns true if the specified URI is using the standard port
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// (i.e. port 80 for HTTP URIs or 443 for HTTPS URIs)
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func isDefaultPort(scheme, port string) bool {
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if port == "" {
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return true
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}
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lowerCaseScheme := strings.ToLower(scheme)
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if (lowerCaseScheme == "http" && port == "80") || (lowerCaseScheme == "https" && port == "443") {
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return true
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}
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return false
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}
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