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// Copyright 2018 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package validation
import (
"net"
"net/url"
"regexp"
"strings"
"code.gitea.io/gitea/modules/setting"
)
var loopbackIPBlocks []*net.IPNet
var externalTrackerRegex = regexp.MustCompile(`({?)(?:user|repo|index)+?(}?)`)
func init() {
for _, cidr := range []string{
"127.0.0.0/8", // IPv4 loopback
"::1/128", // IPv6 loopback
} {
if _, block, err := net.ParseCIDR(cidr); err == nil {
loopbackIPBlocks = append(loopbackIPBlocks, block)
}
}
}
func isLoopbackIP(ip string) bool {
pip := net.ParseIP(ip)
if pip == nil {
return false
}
for _, block := range loopbackIPBlocks {
if block.Contains(pip) {
return true
}
}
return false
}
// IsValidURL checks if URL is valid
func IsValidURL(uri string) bool {
if u, err := url.ParseRequestURI(uri); err != nil ||
(u.Scheme != "http" && u.Scheme != "https") ||
!validPort(portOnly(u.Host)) {
return false
}
return true
}
// IsAPIURL checks if URL is current Gitea instance API URL
func IsAPIURL(uri string) bool {
return strings.HasPrefix(strings.ToLower(uri), strings.ToLower(setting.AppURL+"api"))
}
// IsValidExternalURL checks if URL is valid external URL
func IsValidExternalURL(uri string) bool {
if !IsValidURL(uri) || IsAPIURL(uri) {
return false
}
u, err := url.ParseRequestURI(uri)
if err != nil {
return false
}
// Currently check only if not loopback IP is provided to keep compatibility
if isLoopbackIP(u.Hostname()) || strings.ToLower(u.Hostname()) == "localhost" {
return false
}
// TODO: Later it should be added to allow local network IP addreses
// only if allowed by special setting
return true
}
// IsValidExternalTrackerURLFormat checks if URL matches required syntax for external trackers
func IsValidExternalTrackerURLFormat(uri string) bool {
if !IsValidExternalURL(uri) {
return false
}
// check for typoed variables like /{index/ or /[repo}
for _, match := range externalTrackerRegex.FindAllStringSubmatch(uri, -1) {
if (match[1] == "{" || match[2] == "}") && (match[1] != "{" || match[2] != "}") {
return false
}
}
return true
}
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