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package sls
import (
"crypto/md5"
"encoding/hex"
"net/url"
"sort"
"strings"
"github.com/denverdino/aliyungo/util"
)
const HeaderSLSPrefix1 = "x-log-"
const HeaderSLSPrefix2 = "x-acs-"
func (client *Client) signRequest(req *request, payload []byte) {
// SignString = VERB + "\n"
// + CONTENT-MD5 + "\n"
// + CONTENT-TYPE + "\n"
// + DATE + "\n"
// + CanonicalizedLOGHeaders + "\n"
// + CanonicalizedResource
if _, ok := req.headers["Authorization"]; ok {
return
}
contentMd5 := ""
contentType := req.headers["Content-Type"]
if req.payload != nil {
hasher := md5.New()
hasher.Write(payload)
contentMd5 = strings.ToUpper(hex.EncodeToString(hasher.Sum(nil))) //string(md5.Sum(contentMd5))
req.headers["Content-MD5"] = contentMd5
}
date := req.headers["Date"]
//date := util.GetGMTime()
canonicalizedHeader := canonicalizeHeader(req.headers)
canonicalizedResource := canonicalizeResource(req)
signString := req.method + "\n" + contentMd5 + "\n" + contentType + "\n" + date + "\n" + canonicalizedHeader + "\n" + canonicalizedResource
signature := util.CreateSignature(signString, client.accessKeySecret)
req.headers["Authorization"] = "LOG " + client.accessKeyId + ":" + signature
}
func canonicalizeResource(req *request) string {
canonicalizedResource := req.path
var paramNames []string
if req.params != nil && len(req.params) > 0 {
for k, _ := range req.params {
paramNames = append(paramNames, k)
}
sort.Strings(paramNames)
var query []string
for _, k := range paramNames {
query = append(query, url.QueryEscape(k)+"="+url.QueryEscape(req.params[k]))
}
canonicalizedResource = canonicalizedResource + "?" + strings.Join(query, "&")
}
return canonicalizedResource
}
//Have to break the abstraction to append keys with lower case.
func canonicalizeHeader(headers map[string]string) string {
var canonicalizedHeaders []string
for k, _ := range headers {
if lower := strings.ToLower(k); strings.HasPrefix(lower, HeaderSLSPrefix1) || strings.HasPrefix(lower, HeaderSLSPrefix2) {
canonicalizedHeaders = append(canonicalizedHeaders, lower)
}
}
sort.Strings(canonicalizedHeaders)
var headersWithValue []string
for _, k := range canonicalizedHeaders {
headersWithValue = append(headersWithValue, k+":"+headers[k])
}
return strings.Join(headersWithValue, "\n")
}
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