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Copy pathurl.go
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194 lines (171 loc) · 4.38 KB
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/*
* MinIO Cloud Storage, (C) 2018 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net
import (
"context"
"encoding/json"
"errors"
"fmt"
"net"
"net/url"
"path"
"strings"
)
// URL - improved JSON friendly url.URL.
type URL url.URL
// IsEmpty - checks URL is empty or not.
func (u URL) IsEmpty() bool {
return u.String() == ""
}
// String - returns string representation of URL.
func (u URL) String() string {
// if port number 80 and 443, remove for http and https scheme respectively
if u.Host != "" {
host, err := ParseHost(u.Host)
if err != nil {
panic(err)
}
switch {
case u.Scheme == "http" && host.Port == 80:
fallthrough
case u.Scheme == "https" && host.Port == 443:
u.Host = host.Name
}
}
uu := url.URL(u)
return uu.String()
}
// MarshalJSON - converts to JSON string data.
func (u URL) MarshalJSON() ([]byte, error) {
return json.Marshal(u.String())
}
// UnmarshalJSON - parses given data into URL.
func (u *URL) UnmarshalJSON(data []byte) (err error) {
var s string
if err = json.Unmarshal(data, &s); err != nil {
return err
}
// Allow empty string
if s == "" {
*u = URL{}
return nil
}
var ru *URL
if ru, err = ParseURL(s); err != nil {
return err
}
*u = *ru
return nil
}
// ParseHTTPURL - parses a string into HTTP URL, string is
// expected to be of form http:// or https://
func ParseHTTPURL(s string) (u *URL, err error) {
u, err = ParseURL(s)
if err != nil {
return nil, err
}
switch u.Scheme {
default:
return nil, fmt.Errorf("unexpected scheme found %s", u.Scheme)
case "http", "https":
return u, nil
}
}
// ParseURL - parses string into URL.
func ParseURL(s string) (u *URL, err error) {
var uu *url.URL
if uu, err = url.Parse(s); err != nil {
return nil, err
}
if uu.Hostname() == "" {
if uu.Scheme != "" {
return nil, errors.New("scheme appears with empty host")
}
} else {
portStr := uu.Port()
if portStr == "" {
switch uu.Scheme {
case "http":
portStr = "80"
case "https":
portStr = "443"
}
}
if _, err = ParseHost(net.JoinHostPort(uu.Hostname(), portStr)); err != nil {
return nil, err
}
}
// Clean path in the URL.
// Note: path.Clean() is used on purpose because in MS Windows filepath.Clean() converts
// `/` into `\` ie `/foo` becomes `\foo`
if uu.Path != "" {
uu.Path = path.Clean(uu.Path)
}
// path.Clean removes the trailing '/' and converts '//' to '/'.
if strings.HasSuffix(s, "/") && !strings.HasSuffix(uu.Path, "/") {
uu.Path += "/"
}
v := URL(*uu)
u = &v
return u, nil
}
// IsNetworkOrHostDown - if there was a network error or if the host is down.
// expectTimeouts indicates that *context* timeouts are expected and does not
// indicate a downed host. Other timeouts still returns down.
func IsNetworkOrHostDown(err error, expectTimeouts bool) bool {
if err == nil {
return false
}
if errors.Is(err, context.Canceled) {
return false
}
if expectTimeouts && errors.Is(err, context.DeadlineExceeded) {
return false
}
// We need to figure if the error either a timeout
// or a non-temporary error.
urlErr := &url.Error{}
if errors.As(err, &urlErr) {
switch urlErr.Err.(type) {
case *net.DNSError, *net.OpError, net.UnknownNetworkError:
return true
}
}
var e net.Error
if errors.As(err, &e) {
if e.Timeout() {
return true
}
}
// Fallback to other mechanisms.
switch {
case strings.Contains(err.Error(), "Connection closed by foreign host"):
return true
case strings.Contains(err.Error(), "TLS handshake timeout"):
// If error is - tlsHandshakeTimeoutE
3AAB
rror.
return true
case strings.Contains(err.Error(), "i/o timeout"):
// If error is - tcp timeoutError.
return true
case strings.Contains(err.Error(), "connection timed out"):
// If err is a net.Dial timeout.
return true
case strings.Contains(strings.ToLower(err.Error()), "503 service unavailable"):
// Denial errors
return true
}
return false
}