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Beego/logs/alils/signature.go
2017-04-20 10:56:09 +08:00

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package alils
import (
"crypto/hmac"
"crypto/sha1"
"encoding/base64"
"fmt"
"net/url"
"sort"
"strings"
"time"
)
// GMT location
var gmtLoc = time.FixedZone("GMT", 0)
// NowRFC1123 returns now time in RFC1123 format with GMT timezone,
// eg. "Mon, 02 Jan 2006 15:04:05 GMT".
func nowRFC1123() string {
return time.Now().In(gmtLoc).Format(time.RFC1123)
}
// signature calculates a request's signature digest.
func signature(project *LogProject, method, uri string,
headers map[string]string) (digest string, err error) {
var contentMD5, contentType, date, canoHeaders, canoResource string
var slsHeaderKeys sort.StringSlice
// SignString = VERB + "\n"
// + CONTENT-MD5 + "\n"
// + CONTENT-TYPE + "\n"
// + DATE + "\n"
// + CanonicalizedSLSHeaders + "\n"
// + CanonicalizedResource
if val, ok := headers["Content-MD5"]; ok {
contentMD5 = val
}
if val, ok := headers["Content-Type"]; ok {
contentType = val
}
date, ok := headers["Date"]
if !ok {
err = fmt.Errorf("Can't find 'Date' header")
return
}
// Calc CanonicalizedSLSHeaders
slsHeaders := make(map[string]string, len(headers))
for k, v := range headers {
l := strings.TrimSpace(strings.ToLower(k))
if strings.HasPrefix(l, "x-sls-") {
slsHeaders[l] = strings.TrimSpace(v)
slsHeaderKeys = append(slsHeaderKeys, l)
}
}
sort.Sort(slsHeaderKeys)
for i, k := range slsHeaderKeys {
canoHeaders += k + ":" + slsHeaders[k]
if i+1 < len(slsHeaderKeys) {
canoHeaders += "\n"
}
}
// Calc CanonicalizedResource
u, err := url.Parse(uri)
if err != nil {
return
}
canoResource += url.QueryEscape(u.Path)
if u.RawQuery != "" {
var keys sort.StringSlice
vals := u.Query()
for k := range vals {
keys = append(keys, k)
}
sort.Sort(keys)
canoResource += "?"
for i, k := range keys {
if i > 0 {
canoResource += "&"
}
for _, v := range vals[k] {
canoResource += k + "=" + v
}
}
}
signStr := method + "\n" +
contentMD5 + "\n" +
contentType + "\n" +
date + "\n" +
canoHeaders + "\n" +
canoResource
// Signature = base64(hmac-sha1(UTF8-Encoding-Of(SignString)AccessKeySecret))
mac := hmac.New(sha1.New, []byte(project.AccessKeySecret))
_, err = mac.Write([]byte(signStr))
if err != nil {
return
}
digest = base64.StdEncoding.EncodeToString(mac.Sum(nil))
return
}