forked from minio/mc
/
client-url.go
250 lines (228 loc) · 7.3 KB
/
client-url.go
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// Copyright (c) 2015-2022 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program 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.
//
// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"bytes"
"context"
"path/filepath"
"regexp"
"runtime"
"strings"
"time"
"github.com/trinet2005/oss-mc/pkg/probe"
"github.com/trinet2005/oss-pkg/mimedb"
)
// ClientURL url client url structure
type ClientURL struct {
Type ClientURLType
Scheme string
Host string
Path string
SchemeSeparator string
Separator rune
}
// ClientURLType - enum of different url types
type ClientURLType int
// enum types
const (
objectStorage = iota // MinIO and S3 compatible cloud storage
fileSystem // POSIX compatible file systems
)
// Maybe rawurl is of the form scheme:path. (Scheme must be [a-zA-Z][a-zA-Z0-9+-.]*)
// If so, return scheme, path; else return "", rawurl.
func getScheme(rawurl string) (scheme, path string) {
urlSplits := strings.Split(rawurl, "://")
if len(urlSplits) == 2 {
scheme, uri := urlSplits[0], "//"+urlSplits[1]
// ignore numbers in scheme
validScheme := regexp.MustCompile("^[a-zA-Z]+$")
if uri != "" {
if validScheme.MatchString(scheme) {
return scheme, uri
}
}
}
return "", rawurl
}
// Assuming s is of the form [s delimiter s].
// If so, return s, [delimiter]s or return s, s if cutdelimiter == true
// If no delimiter found return s, "".
func splitSpecial(s, delimiter string, cutdelimiter bool) (string, string) {
i := strings.Index(s, delimiter)
if i < 0 {
// if delimiter not found return as is.
return s, ""
}
// if delimiter should be removed, remove it.
if cutdelimiter {
return s[0:i], s[i+len(delimiter):]
}
// return split strings with delimiter
return s[0:i], s[i:]
}
// getHost - extract host from authority string, we do not support ftp style username@ yet.
func getHost(authority string) (host string) {
i := strings.LastIndex(authority, "@")
if i >= 0 {
// TODO support, username@password style userinfo, useful for ftp support.
return
}
return authority
}
// newClientURL returns an abstracted URL for filesystems and object storage.
func newClientURL(urlStr string) *ClientURL {
scheme, rest := getScheme(urlStr)
if strings.HasPrefix(rest, "//") {
// if rest has '//' prefix, skip them
var authority string
authority, rest = splitSpecial(rest[2:], "/", false)
if rest == "" {
rest = "/"
}
host := getHost(authority)
if host != "" && (scheme == "http" || scheme == "https") {
return &ClientURL{
Scheme: scheme,
Type: objectStorage,
Host: host,
Path: rest,
SchemeSeparator: "://",
Separator: '/',
}
}
}
return &ClientURL{
Type: fileSystem,
Path: rest,
Separator: filepath.Separator,
}
}
// joinURLs join two input urls and returns a url
func joinURLs(url1, url2 *ClientURL) *ClientURL {
var url1Path, url2Path string
url1Path = filepath.ToSlash(url1.Path)
url2Path = filepath.ToSlash(url2.Path)
if strings.HasSuffix(url1Path, "/") {
url1.Path = url1Path + strings.TrimPrefix(url2Path, "/")
} else {
url1.Path = url1Path + "/" + strings.TrimPrefix(url2Path, "/")
}
return url1
}
// Clone the url into a new object.
func (u ClientURL) Clone() ClientURL {
return ClientURL{
Type: u.Type,
Scheme: u.Scheme,
Host: u.Host,
Path: u.Path,
SchemeSeparator: u.SchemeSeparator,
Separator: u.Separator,
}
}
// String convert URL into its canonical form.
func (u ClientURL) String() string {
var buf bytes.Buffer
// if fileSystem no translation needed, return as is.
if u.Type == fileSystem {
return u.Path
}
// if objectStorage convert from any non standard paths to a supported URL path style.
if u.Type == objectStorage {
buf.WriteString(u.Scheme)
buf.WriteByte(':')
buf.WriteString("//")
if h := u.Host; h != "" {
buf.WriteString(h)
}
switch runtime.GOOS {
case "windows":
if u.Path != "" && u.Path[0] != '\\' && u.Host != "" && u.Path[0] != '/' {
buf.WriteByte('/')
}
buf.WriteString(strings.ReplaceAll(u.Path, "\\", "/"))
default:
if u.Path != "" && u.Path[0] != '/' && u.Host != "" {
buf.WriteByte('/')
}
buf.WriteString(u.Path)
}
}
return buf.String()
}
// urlJoinPath Join a path to existing URL.
func urlJoinPath(url1, url2 string) string {
u1 := newClientURL(url1)
u2 := newClientURL(url2)
return joinURLs(u1, u2).String()
}
// url2Stat returns stat info for URL - supports bucket, object and a prefixe with or without a trailing slash
func url2Stat(ctx context.Context, urlStr, versionID string, fileAttr bool, encKeyDB map[string][]prefixSSEPair, timeRef time.Time, isZip bool) (client Client, content *ClientContent, err *probe.Error) {
client, err = newClient(urlStr)
if err != nil {
return nil, nil, err.Trace(urlStr)
}
alias, _ := url2Alias(urlStr)
sse := getSSE(urlStr, encKeyDB[alias])
content, err = client.Stat(ctx, StatOptions{preserve: fileAttr, sse: sse, timeRef: timeRef, versionID: versionID, isZip: isZip})
if err != nil {
return nil, nil, err.Trace(urlStr)
}
return client, content, nil
}
// firstURL2Stat returns the stat info of the first object having the specified prefix
func firstURL2Stat(ctx context.Context, prefix string, timeRef time.Time, isZip bool) (client Client, content *ClientContent, err *probe.Error) {
client, err = newClient(prefix)
if err != nil {
return nil, nil, err.Trace(prefix)
}
content = <-client.List(ctx, ListOptions{Recursive: true, TimeRef: timeRef, Count: 1, ListZip: isZip})
if content == nil {
return nil, nil, probe.NewError(ObjectMissing{timeRef: timeRef}).Trace(prefix)
}
if content.Err != nil {
return nil, nil, content.Err.Trace(prefix)
}
return client, content, nil
}
// url2Alias separates alias and path from the URL. Aliased URL is of
// the form alias/path/to/blah.
func url2Alias(aliasedURL string) (alias, path string) {
// Save aliased url.
urlStr := aliasedURL
// Convert '/' on windows to filepath.Separator.
urlStr = filepath.FromSlash(urlStr)
if runtime.GOOS == "windows" {
// Remove '/' prefix before alias if any to support '\\home' alias
// style under Windows
urlStr = strings.TrimPrefix(urlStr, string(filepath.Separator))
}
// Remove everything after alias (i.e. after '/').
urlParts := strings.SplitN(urlStr, string(filepath.Separator), 2)
if len(urlParts) == 2 {
// Convert windows style path separator to Unix style.
return urlParts[0], urlParts[1]
}
return urlParts[0], ""
}
// guessURLContentType - guess content-type of the URL.
// on failure just return 'application/octet-stream'.
func guessURLContentType(urlStr string) string {
url := newClientURL(urlStr)
contentType := mimedb.TypeByExtension(filepath.Ext(url.Path))
return contentType
}