Add Aliyun Logger

logs/alils/signature.go

@@ -0,0 +1,112 @@
+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
+}
+