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restic/vendor/github.com/Azure/azure-sdk-for-go/storage/util.go
2018-03-30 11:42:11 +02:00

245 lines
6.1 KiB
Go

package storage
// Copyright 2017 Microsoft Corporation
//
// 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.
import (
"bytes"
"crypto/hmac"
"crypto/sha256"
"encoding/base64"
"encoding/xml"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"reflect"
"strconv"
"strings"
"time"
)
var (
fixedTime = time.Date(2050, time.December, 20, 21, 55, 0, 0, time.FixedZone("GMT", -6))
accountSASOptions = AccountSASTokenOptions{
Services: Services{
Blob: true,
},
ResourceTypes: ResourceTypes{
Service: true,
Container: true,
Object: true,
},
Permissions: Permissions{
Read: true,
Write: true,
Delete: true,
List: true,
Add: true,
Create: true,
Update: true,
Process: true,
},
Expiry: fixedTime,
UseHTTPS: true,
}
)
func (c Client) computeHmac256(message string) string {
h := hmac.New(sha256.New, c.accountKey)
h.Write([]byte(message))
return base64.StdEncoding.EncodeToString(h.Sum(nil))
}
func currentTimeRfc1123Formatted() string {
return timeRfc1123Formatted(time.Now().UTC())
}
func timeRfc1123Formatted(t time.Time) string {
return t.Format(http.TimeFormat)
}
func timeRFC3339Formatted(t time.Time) string {
return t.Format("2006-01-02T15:04:05.0000000Z")
}
func mergeParams(v1, v2 url.Values) url.Values {
out := url.Values{}
for k, v := range v1 {
out[k] = v
}
for k, v := range v2 {
vals, ok := out[k]
if ok {
vals = append(vals, v...)
out[k] = vals
} else {
out[k] = v
}
}
return out
}
func prepareBlockListRequest(blocks []Block) string {
s := `<?xml version="1.0" encoding="utf-8"?><BlockList>`
for _, v := range blocks {
s += fmt.Sprintf("<%s>%s</%s>", v.Status, v.ID, v.Status)
}
s += `</BlockList>`
return s
}
func xmlUnmarshal(body io.Reader, v interface{}) error {
data, err := ioutil.ReadAll(body)
if err != nil {
return err
}
return xml.Unmarshal(data, v)
}
func xmlMarshal(v interface{}) (io.Reader, int, error) {
b, err := xml.Marshal(v)
if err != nil {
return nil, 0, err
}
return bytes.NewReader(b), len(b), nil
}
func headersFromStruct(v interface{}) map[string]string {
headers := make(map[string]string)
value := reflect.ValueOf(v)
for i := 0; i < value.NumField(); i++ {
key := value.Type().Field(i).Tag.Get("header")
if key != "" {
reflectedValue := reflect.Indirect(value.Field(i))
var val string
if reflectedValue.IsValid() {
switch reflectedValue.Type() {
case reflect.TypeOf(fixedTime):
val = timeRfc1123Formatted(reflectedValue.Interface().(time.Time))
case reflect.TypeOf(uint64(0)), reflect.TypeOf(uint(0)):
val = strconv.FormatUint(reflectedValue.Uint(), 10)
case reflect.TypeOf(int(0)):
val = strconv.FormatInt(reflectedValue.Int(), 10)
default:
val = reflectedValue.String()
}
}
if val != "" {
headers[key] = val
}
}
}
return headers
}
// merges extraHeaders into headers and returns headers
func mergeHeaders(headers, extraHeaders map[string]string) map[string]string {
for k, v := range extraHeaders {
headers[k] = v
}
return headers
}
func addToHeaders(h map[string]string, key, value string) map[string]string {
if value != "" {
h[key] = value
}
return h
}
func addTimeToHeaders(h map[string]string, key string, value *time.Time) map[string]string {
if value != nil {
h = addToHeaders(h, key, timeRfc1123Formatted(*value))
}
return h
}
func addTimeout(params url.Values, timeout uint) url.Values {
if timeout > 0 {
params.Add("timeout", fmt.Sprintf("%v", timeout))
}
return params
}
func addSnapshot(params url.Values, snapshot *time.Time) url.Values {
if snapshot != nil {
params.Add("snapshot", timeRFC3339Formatted(*snapshot))
}
return params
}
func getTimeFromHeaders(h http.Header, key string) (*time.Time, error) {
var out time.Time
var err error
outStr := h.Get(key)
if outStr != "" {
out, err = time.Parse(time.RFC1123, outStr)
if err != nil {
return nil, err
}
}
return &out, nil
}
// TimeRFC1123 is an alias for time.Time needed for custom Unmarshalling
type TimeRFC1123 time.Time
// UnmarshalXML is a custom unmarshaller that overrides the default time unmarshal which uses a different time layout.
func (t *TimeRFC1123) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
var value string
d.DecodeElement(&value, &start)
parse, err := time.Parse(time.RFC1123, value)
if err != nil {
return err
}
*t = TimeRFC1123(parse)
return nil
}
// MarshalXML marshals using time.RFC1123.
func (t *TimeRFC1123) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
return e.EncodeElement(time.Time(*t).Format(time.RFC1123), start)
}
// returns a map of custom metadata values from the specified HTTP header
func getMetadataFromHeaders(header http.Header) map[string]string {
metadata := make(map[string]string)
for k, v := range header {
// Can't trust CanonicalHeaderKey() to munge case
// reliably. "_" is allowed in identifiers:
// https://msdn.microsoft.com/en-us/library/azure/dd179414.aspx
// https://msdn.microsoft.com/library/aa664670(VS.71).aspx
// http://tools.ietf.org/html/rfc7230#section-3.2
// ...but "_" is considered invalid by
// CanonicalMIMEHeaderKey in
// https://golang.org/src/net/textproto/reader.go?s=14615:14659#L542
// so k can be "X-Ms-Meta-Lol" or "x-ms-meta-lol_rofl".
k = strings.ToLower(k)
if len(v) == 0 || !strings.HasPrefix(k, strings.ToLower(userDefinedMetadataHeaderPrefix)) {
continue
}
// metadata["lol"] = content of the last X-Ms-Meta-Lol header
k = k[len(userDefinedMetadataHeaderPrefix):]
metadata[k] = v[len(v)-1]
}
if len(metadata) == 0 {
return nil
}
return metadata
}