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// Copyright 2018 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package validation
import (
"net"
"net/url"
"regexp"
"strings"
"code.gitea.io/gitea/modules/setting"
)
var externalTrackerRegex = regexp.MustCompile(`({?)(?:user|repo|index)+?(}?)`)
func isLoopbackIP(ip string) bool {
return net.ParseIP(ip).IsLoopback()
}
// 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
}
// IsValidSiteURL checks if URL is valid
func IsValidSiteURL(uri string) bool {
u, err := url.ParseRequestURI(uri)
if err != nil {
return false
}
if !validPort(portOnly(u.Host)) {
return false
}
for _, scheme := range setting.Service.ValidSiteURLSchemes {
if scheme == u.Scheme {
return true
}
}
return false
}
// 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 addresses
// 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
}
var (
validUsernamePattern = regexp.MustCompile(`^[\da-zA-Z][-.\w]*$`)
invalidUsernamePattern = regexp.MustCompile(`[-._]{2,}|[-._]$`) // No consecutive or trailing non-alphanumeric chars
)
// IsValidUsername checks if username is valid
func IsValidUsername(name string) bool {
// It is difficult to find a single pattern that is both readable and effective,
// but it's easier to use positive and negative checks.
return validUsernamePattern.MatchString(name) && !invalidUsernamePattern.MatchString(name)
}
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