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// Copyright (C) 2019-2024 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package network
import (
"errors"
"net/url"
"path"
"regexp"
"strings"
"github.com/multiformats/go-multiaddr"
)
var errURLNoHost = errors.New("could not parse a host from url")
var errURLColonHost = errors.New("host name starts with a colon")
// HostColonPortPattern matches "^[-a-zA-Z0-9.]+:\\d+$" e.g. "foo.com.:1234"
var HostColonPortPattern = regexp.MustCompile(`^[-a-zA-Z0-9.]+:\d+$`)
// ParseHostOrURL handles "host:port" or a full URL.
// Standard library net/url.Parse chokes on "host:port".
func ParseHostOrURL(addr string) (*url.URL, error) {
// If the entire addr is "host:port" grab that right away.
// Don't try url.Parse() because that will grab "host:" as if it were "scheme:"
if HostColonPortPattern.MatchString(addr) {
return &url.URL{Scheme: "http", Host: addr}, nil
}
parsed, err := url.Parse(addr)
if err == nil {
if parsed.Host == "" {
return nil, errURLNoHost
}
return parsed, nil
}
if strings.HasPrefix(addr, "http:") || strings.HasPrefix(addr, "https:") || strings.HasPrefix(addr, "ws:") || strings.HasPrefix(addr, "wss:") || strings.HasPrefix(addr, "://") || strings.HasPrefix(addr, "//") {
return parsed, err
}
// This turns "[::]:4601" into "http://[::]:4601" which url.Parse can do
parsed, e2 := url.Parse("http://" + addr)
if e2 == nil {
// https://datatracker.ietf.org/doc/html/rfc1123#section-2
// first character is relaxed to allow either a letter or a digit
if parsed.Host[0] == ':' && (len(parsed.Host) < 2 || parsed.Host[1] != ':') {
return nil, errURLColonHost
}
return parsed, nil
}
return parsed, err /* return original err, not our prefix altered try */
}
// ParseHostOrURLOrMultiaddr returns an error if it could not parse the provided
// string as a valid "host:port", full URL, or multiaddr. If no error, it returns
// a host:port address, or a multiaddr.
func ParseHostOrURLOrMultiaddr(addr string) (string, error) {
if strings.HasPrefix(addr, "/") && !strings.HasPrefix(addr, "//") { // multiaddr starts with '/' but not '//' which is possible for scheme relative URLS
_, err := multiaddr.NewMultiaddr(addr)
return addr, err
}
url, err := ParseHostOrURL(addr)
if err != nil {
return "", err
}
return url.Host, nil
}
// addrToGossipAddr parses host:port or a URL and returns the URL to the websocket interface at that address.
func (wn *WebsocketNetwork) addrToGossipAddr(addr string) (string, error) {
parsedURL, err := ParseHostOrURL(addr)
if err != nil {
wn.log.Warnf("could not parse addr %#v: %s", addr, err)
return "", errBadAddr
}
parsedURL.Scheme = websocketsScheme[parsedURL.Scheme]
if parsedURL.Scheme == "" {
parsedURL.Scheme = "ws"
}
parsedURL.Path = strings.Replace(path.Join(parsedURL.Path, GossipNetworkPath), "{genesisID}", wn.GenesisID, -1)
return parsedURL.String(), nil
}
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