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package oss
import (
"bytes"
"crypto/md5"
"encoding/base64"
"encoding/xml"
"fmt"
"hash"
"io"
"io/ioutil"
"net"
"net/http"
"net/url"
"os"
"sort"
"strconv"
"strings"
"time"
)
// Conn oss conn
type Conn struct {
config *Config
url *urlMaker
client *http.Client
}
var signKeyList = []string{"acl", "uploads", "location", "cors", "logging", "website", "referer", "lifecycle", "delete", "append", "tagging", "objectMeta", "uploadId", "partNumber", "security-token", "position", "img", "style", "styleName", "replication", "replicationProgress", "replicationLocation", "cname", "bucketInfo", "comp", "qos", "live", "status", "vod", "startTime", "endTime", "symlink", "x-oss-process", "response-content-type", "response-content-language", "response-expires", "response-cache-control", "response-content-disposition", "response-content-encoding", "udf", "udfName", "udfImage", "udfId", "udfImageDesc", "udfApplication", "comp", "udfApplicationLog", "restore"}
// init 初始化Conn
func (conn *Conn) init(config *Config, urlMaker *urlMaker) error {
httpTimeOut := conn.config.HTTPTimeout
// new Transport
transport := &http.Transport{
Dial: func(netw, addr string) (net.Conn, error) {
conn, err := net.DialTimeout(netw, addr, httpTimeOut.ConnectTimeout)
if err != nil {
return nil, err
}
return newTimeoutConn(conn, httpTimeOut.ReadWriteTimeout, httpTimeOut.LongTimeout), nil
},
ResponseHeaderTimeout: httpTimeOut.HeaderTimeout,
}
// Proxy
if conn.config.IsUseProxy {
proxyURL, err := url.Parse(config.ProxyHost)
if err != nil {
return err
}
transport.Proxy = http.ProxyURL(proxyURL)
}
conn.config = config
conn.url = urlMaker
conn.client = &http.Client{Transport: transport}
return nil
}
// Do 处理请求,返回响应结果。
func (conn Conn) Do(method, bucketName, objectName string, params map[string]interface{}, headers map[string]string,
data io.Reader, initCRC uint64, listener ProgressListener) (*Response, error) {
urlParams := conn.getURLParams(params)
subResource := conn.getSubResource(params)
uri := conn.url.getURL(bucketName, objectName, urlParams)
resource := conn.url.getResource(bucketName, objectName, subResource)
return conn.doRequest(method, uri, resource, headers, data, initCRC, listener)
}
// DoURL 根据已签名的URL处理请求,返回响应结果。
func (conn Conn) DoURL(method HTTPMethod, signedURL string, headers map[string]string,
data io.Reader, initCRC uint64, listener ProgressListener) (*Response, error) {
// get uri form signedURL
uri, err := url.ParseRequestURI(signedURL)
if err != nil {
return nil, err
}
m := strings.ToUpper(string(method))
req := &http.Request{
Method: m,
URL: uri,
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
Header: make(http.Header),
Host: uri.Host,
}
tracker := &readerTracker{completedBytes: 0}
fd, crc := conn.handleBody(req, data, initCRC, listener, tracker)
if fd != nil {
defer func() {
fd.Close()
os.Remove(fd.Name())
}()
}
if conn.config.IsAuthProxy {
auth := conn.config.ProxyUser + ":" + conn.config.ProxyPassword
basic := "Basic " + base64.StdEncoding.EncodeToString([]byte(auth))
req.Header.Set("Proxy-Authorization", basic)
}
req.Header.Set(HTTPHeaderHost, conn.config.Endpoint)
req.Header.Set(HTTPHeaderUserAgent, conn.config.UserAgent)
if headers != nil {
for k, v := range headers {
req.Header.Set(k, v)
}
}
// transfer started
event := newProgressEvent(TransferStartedEvent, 0, req.ContentLength)
publishProgress(listener, event)
resp, err := conn.client.Do(req)
if err != nil {
// transfer failed
event = newProgressEvent(TransferFailedEvent, tracker.completedBytes, req.ContentLength)
publishProgress(listener, event)
return nil, err
}
// transfer completed
event = newProgressEvent(TransferCompletedEvent, tracker.completedBytes, req.ContentLength)
publishProgress(listener, event)
return conn.handleResponse(resp, crc)
}
func (conn Conn) getURLParams(params map[string]interface{}) string {
// sort
keys := make([]string, 0, len(params))
for k := range params {
keys = append(keys, k)
}
sort.Strings(keys)
// serialize
var buf bytes.Buffer
for _, k := range keys {
if buf.Len() > 0 {
buf.WriteByte('&')
}
buf.WriteString(url.QueryEscape(k))
if params[k] != nil {
buf.WriteString("=" + url.QueryEscape(params[k].(string)))
}
}
return buf.String()
}
func (conn Conn) getSubResource(params map[string]interface{}) string {
// sort
keys := make([]string, 0, len(params))
for k := range params {
if conn.isParamSign(k) {
keys = append(keys, k)
}
}
sort.Strings(keys)
// serialize
var buf bytes.Buffer
for _, k := range keys {
if buf.Len() > 0 {
buf.WriteByte('&')
}
buf.WriteString(k)
if params[k] != nil {
buf.WriteString("=" + params[k].(string))
}
}
return buf.String()
}
func (conn Conn) isParamSign(paramKey string) bool {
for _, k := range signKeyList {
if paramKey == k {
return true
}
}
return false
}
func (conn Conn) doRequest(method string, uri *url.URL, canonicalizedResource string, headers map[string]string,
data io.Reader, initCRC uint64, listener ProgressListener) (*Response, error) {
method = strings.ToUpper(method)
req := &http.Request{
Method: method,
URL: uri,
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
Header: make(http.Header),
Host: uri.Host,
}
tracker := &readerTracker{completedBytes: 0}
fd, crc := conn.handleBody(req, data, initCRC, listener, tracker)
if fd != nil {
defer func() {
fd.Close()
os.Remove(fd.Name())
}()
}
if conn.config.IsAuthProxy {
auth := conn.config.ProxyUser + ":" + conn.config.ProxyPassword
basic := "Basic " + base64.StdEncoding.EncodeToString([]byte(auth))
req.Header.Set("Proxy-Authorization", basic)
}
date := time.Now().UTC().Format(http.TimeFormat)
req.Header.Set(HTTPHeaderDate, date)
req.Header.Set(HTTPHeaderHost, conn.config.Endpoint)
req.Header.Set(HTTPHeaderUserAgent, conn.config.UserAgent)
if conn.config.SecurityToken != "" {
req.Header.Set(HTTPHeaderOssSecurityToken, conn.config.SecurityToken)
}
if headers != nil {
for k, v := range headers {
req.Header.Set(k, v)
}
}
conn.signHeader(req, canonicalizedResource)
// transfer started
event := newProgressEvent(TransferStartedEvent, 0, req.ContentLength)
publishProgress(listener, event)
resp, err := conn.client.Do(req)
if err != nil {
// transfer failed
event = newProgressEvent(TransferFailedEvent, tracker.completedBytes, req.ContentLength)
publishProgress(listener, event)
return nil, err
}
// transfer completed
event = newProgressEvent(TransferCompletedEvent, tracker.completedBytes, req.ContentLength)
publishProgress(listener, event)
return conn.handleResponse(resp, crc)
}
func (conn Conn) signURL(method HTTPMethod, bucketName, objectName string, expiration int64, params map[string]interface{}, headers map[string]string) string {
subResource := conn.getSubResource(params)
canonicalizedResource := conn.url.getResource(bucketName, objectName, subResource)
m := strings.ToUpper(string(method))
req := &http.Request{
Method: m,
Header: make(http.Header),
}
if conn.config.IsAuthProxy {
auth := conn.config.ProxyUser + ":" + conn.config.ProxyPassword
basic := "Basic " + base64.StdEncoding.EncodeToString([]byte(auth))
req.Header.Set("Proxy-Authorization", basic)
}
req.Header.Set(HTTPHeaderDate, strconv.FormatInt(expiration, 10))
req.Header.Set(HTTPHeaderHost, conn.config.Endpoint)
req.Header.Set(HTTPHeaderUserAgent, conn.config.UserAgent)
if headers != nil {
for k, v := range headers {
req.Header.Set(k, v)
}
}
signedStr := conn.getSignedStr(req, canonicalizedResource)
params[HTTPParamExpires] = strconv.FormatInt(expiration, 10)
params[HTTPParamAccessKeyID] = conn.config.AccessKeyID
params[HTTPParamSignature] = signedStr
if conn.config.SecurityToken != "" {
params[HTTPParamSecurityToken] = conn.config.SecurityToken
}
urlParams := conn.getURLParams(params)
return conn.url.getSignURL(bucketName, objectName, urlParams)
}
// handle request body
func (conn Conn) handleBody(req *http.Request, body io.Reader, initCRC uint64,
listener ProgressListener, tracker *readerTracker) (*os.File, hash.Hash64) {
var file *os.File
var crc hash.Hash64
reader := body
// length
switch v := body.(type) {
case *bytes.Buffer:
req.ContentLength = int64(v.Len())
case *bytes.Reader:
req.ContentLength = int64(v.Len())
case *strings.Reader:
req.ContentLength = int64(v.Len())
case *os.File:
req.ContentLength = tryGetFileSize(v)
case *io.LimitedReader:
req.ContentLength = int64(v.N)
}
req.Header.Set(HTTPHeaderContentLength, strconv.FormatInt(req.ContentLength, 10))
// md5
if body != nil && conn.config.IsEnableMD5 && req.Header.Get(HTTPHeaderContentMD5) == "" {
md5 := ""
reader, md5, file, _ = calcMD5(body, req.ContentLength, conn.config.MD5Threshold)
req.Header.Set(HTTPHeaderContentMD5, md5)
}
// crc
if reader != nil && conn.config.IsEnableCRC {
crc = NewCRC(crcTable(), initCRC)
reader = TeeReader(reader, crc, req.ContentLength, listener, tracker)
}
// http body
rc, ok := reader.(io.ReadCloser)
if !ok && reader != nil {
rc = ioutil.NopCloser(reader)
}
req.Body = rc
return file, crc
}
func tryGetFileSize(f *os.File) int64 {
fInfo, _ := f.Stat()
return fInfo.Size()
}
// handle response
func (conn Conn) handleResponse(resp *http.Response, crc hash.Hash64) (*Response, error) {
var cliCRC uint64
var srvCRC uint64
statusCode := resp.StatusCode
if statusCode >= 400 && statusCode <= 505 {
// 4xx and 5xx indicate that the operation has error occurred
var respBody []byte
respBody, err := readResponseBody(resp)
if err != nil {
return nil, err
}
if len(respBody) == 0 {
// no error in response body
err = fmt.Errorf("oss: service returned without a response body (%s)", resp.Status)
} else {
// response contains storage service error object, unmarshal
srvErr, errIn := serviceErrFromXML(respBody, resp.StatusCode,
resp.Header.Get(HTTPHeaderOssRequestID))
if err != nil { // error unmarshaling the error response
err = errIn
}
err = srvErr
}
return &Response{
StatusCode: resp.StatusCode,
Headers: resp.Header,
Body: ioutil.NopCloser(bytes.NewReader(respBody)), // restore the body
}, err
} else if statusCode >= 300 && statusCode <= 307 {
// oss use 3xx, but response has no body
err := fmt.Errorf("oss: service returned %d,%s", resp.StatusCode, resp.Status)
return &Response{
StatusCode: resp.StatusCode,
Headers: resp.Header,
Body: resp.Body,
}, err
}
if conn.config.IsEnableCRC && crc != nil {
cliCRC = crc.Sum64()
}
srvCRC, _ = strconv.ParseUint(resp.Header.Get(HTTPHeaderOssCRC64), 10, 64)
// 2xx, successful
return &Response{
StatusCode: resp.StatusCode,
Headers: resp.Header,
Body: resp.Body,
ClientCRC: cliCRC,
ServerCRC: srvCRC,
}, nil
}
func calcMD5(body io.Reader, contentLen, md5Threshold int64) (reader io.Reader, b64 string, tempFile *os.File, err error) {
if contentLen == 0 || contentLen > md5Threshold {
// huge body, use temporary file
tempFile, err = ioutil.TempFile(os.TempDir(), TempFilePrefix)
if tempFile != nil {
io.Copy(tempFile, body)
tempFile.Seek(0, os.SEEK_SET)
md5 := md5.New()
io.Copy(md5, tempFile)
sum := md5.Sum(nil)
b64 = base64.StdEncoding.EncodeToString(sum[:])
tempFile.Seek(0, os.SEEK_SET)
reader = tempFile
}
} else {
// small body, use memory
buf, _ := ioutil.ReadAll(body)
sum := md5.Sum(buf)
b64 = base64.StdEncoding.EncodeToString(sum[:])
reader = bytes.NewReader(buf)
}
return
}
func readResponseBody(resp *http.Response) ([]byte, error) {
defer resp.Body.Close()
out, err := ioutil.ReadAll(resp.Body)
if err == io.EOF {
err = nil
}
return out, err
}
func serviceErrFromXML(body []byte, statusCode int, requestID string) (ServiceError, error) {
var storageErr ServiceError
if err := xml.Unmarshal(body, &storageErr); err != nil {
return storageErr, err
}
storageErr.StatusCode = statusCode
storageErr.RequestID = requestID
storageErr.RawMessage = string(body)
return storageErr, nil
}
func xmlUnmarshal(body io.Reader, v interface{}) error {
data, err := ioutil.ReadAll(body)
if err != nil {
return err
}
return xml.Unmarshal(data, v)
}
// Handle http timeout
type timeoutConn struct {
conn net.Conn
timeout time.Duration
longTimeout time.Duration
}
func newTimeoutConn(conn net.Conn, timeout time.Duration, longTimeout time.Duration) *timeoutConn {
conn.SetReadDeadline(time.Now().Add(longTimeout))
return &timeoutConn{
conn: conn,
timeout: timeout,
longTimeout: longTimeout,
}
}
func (c *timeoutConn) Read(b []byte) (n int, err error) {
c.SetReadDeadline(time.Now().Add(c.timeout))
n, err = c.conn.Read(b)
c.SetReadDeadline(time.Now().Add(c.longTimeout))
return n, err
}
func (c *timeoutConn) Write(b []byte) (n int, err error) {
c.SetWriteDeadline(time.Now().Add(c.timeout))
n, err = c.conn.Write(b)
c.SetReadDeadline(time.Now().Add(c.longTimeout))
return n, err
}
func (c *timeoutConn) Close() error {
return c.conn.Close()
}
func (c *timeoutConn) LocalAddr() net.Addr {
return c.conn.LocalAddr()
}
func (c *timeoutConn) RemoteAddr() net.Addr {
return c.conn.RemoteAddr()
}
func (c *timeoutConn) SetDeadline(t time.Time) error {
return c.conn.SetDeadline(t)
}
func (c *timeoutConn) SetReadDeadline(t time.Time) error {
return c.conn.SetReadDeadline(t)
}
func (c *timeoutConn) SetWriteDeadline(t time.Time) error {
return c.conn.SetWriteDeadline(t)
}
// UrlMaker - build url and resource
const (
urlTypeCname = 1
urlTypeIP = 2
urlTypeAliyun = 3
)
type urlMaker struct {
Scheme string // http or https
NetLoc string // host or ip
Type int // 1 CNAME 2 IP 3 ALIYUN
IsProxy bool // proxy
}
// Parse endpoint
func (um *urlMaker) Init(endpoint string, isCname bool, isProxy bool) {
if strings.HasPrefix(endpoint, "http://") {
um.Scheme = "http"
um.NetLoc = endpoint[len("http://"):]
} else if strings.HasPrefix(endpoint, "https://") {
um.Scheme = "https"
um.NetLoc = endpoint[len("https://"):]
} else {
um.Scheme = "http"
um.NetLoc = endpoint
}
host, _, err := net.SplitHostPort(um.NetLoc)
if err != nil {
host = um.NetLoc
}
ip := net.ParseIP(host)
if ip != nil {
um.Type = urlTypeIP
} else if isCname {
um.Type = urlTypeCname
} else {
um.Type = urlTypeAliyun
}
um.IsProxy = isProxy
}
// Build URL
func (um urlMaker) getURL(bucket, object, params string) *url.URL {
host, path := um.buildURL(bucket, object)
addr := ""
if params == "" {
addr = fmt.Sprintf("%s://%s%s", um.Scheme, host, path)
} else {
addr = fmt.Sprintf("%s://%s%s?%s", um.Scheme, host, path, params)
}
uri, _ := url.ParseRequestURI(addr)
return uri
}
// Build Sign URL
func (um urlMaker) getSignURL(bucket, object, params string) string {
host, path := um.buildURL(bucket, object)
return fmt.Sprintf("%s://%s%s?%s", um.Scheme, host, path, params)
}
// Build URL
func (um urlMaker) buildURL(bucket, object string) (string, string) {
var host = ""
var path = ""
object = url.QueryEscape(object)
object = strings.Replace(object, "+", "%20", -1)
if um.Type == urlTypeCname {
host = um.NetLoc
path = "/" + object
} else if um.Type == urlTypeIP {
if bucket == "" {
host = um.NetLoc
path = "/"
} else {
host = um.NetLoc
path = fmt.Sprintf("/%s/%s", bucket, object)
}
} else {
if bucket == "" {
host = um.NetLoc
path = "/"
} else {
host = bucket + "." + um.NetLoc
path = "/" + object
}
}
return host, path
}
// Canonicalized Resource
func (um urlMaker) getResource(bucketName, objectName, subResource string) string {
if subResource != "" {
subResource = "?" + subResource
}
if bucketName == "" {
return fmt.Sprintf("/%s%s", bucketName, subResource)
}
return fmt.Sprintf("/%s/%s%s", bucketName, objectName, subResource)
}