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package s3
import (
"crypto/hmac"
"crypto/sha1"
"encoding/base64"
"github.com/goamz/goamz/aws"
"log"
"sort"
"strings"
)
var b64 = base64.StdEncoding
// ----------------------------------------------------------------------------
// S3 signing (http://goo.gl/G1LrK)
var s3ParamsToSign = map[string]bool{
"acl": true,
"location": true,
"logging": true,
"notification": true,
"partNumber": true,
"policy": true,
"requestPayment": true,
"torrent": true,
"uploadId": true,
"uploads": true,
"versionId": true,
"versioning": true,
"versions": true,
"response-content-type": true,
"response-content-language": true,
"response-expires": true,
"response-cache-control": true,
"response-content-disposition": true,
"response-content-encoding": true,
"website": true,
"delete": true,
}
func sign(auth aws.Auth, method, canonicalPath string, params, headers map[string][]string) {
var md5, ctype, date, xamz string
var xamzDate bool
var sarray []string
for k, v := range headers {
k = strings.ToLower(k)
switch k {
case "content-md5":
md5 = v[0]
case "content-type":
ctype = v[0]
case "date":
if !xamzDate {
date = v[0]
}
default:
if strings.HasPrefix(k, "x-amz-") {
vall := strings.Join(v, ",")
sarray = append(sarray, k+":"+vall)
if k == "x-amz-date" {
xamzDate = true
date = ""
}
}
}
}
if len(sarray) > 0 {
sort.StringSlice(sarray).Sort()
xamz = strings.Join(sarray, "\n") + "\n"
}
expires := false
if v, ok := params["Expires"]; ok {
// Query string request authentication alternative.
expires = true
date = v[0]
params["AWSAccessKeyId"] = []string{auth.AccessKey}
}
sarray = sarray[0:0]
for k, v := range params {
if s3ParamsToSign[k] {
for _, vi := range v {
if vi == "" {
sarray = append(sarray, k)
} else {
// "When signing you do not encode these values."
sarray = append(sarray, k+"="+vi)
}
}
}
}
if len(sarray) > 0 {
sort.StringSlice(sarray).Sort()
canonicalPath = canonicalPath + "?" + strings.Join(sarray, "&")
}
payload := method + "\n" + md5 + "\n" + ctype + "\n" + date + "\n" + xamz + canonicalPath
hash := hmac.New(sha1.New, []byte(auth.SecretKey))
hash.Write([]byte(payload))
signature := make([]byte, b64.EncodedLen(hash.Size()))
b64.Encode(signature, hash.Sum(nil))
if expires {
params["Signature"] = []string{string(signature)}
} else {
headers["Authorization"] = []string{"AWS " + auth.AccessKey + ":" + string(signature)}
}
if debug {
log.Printf("Signature payload: %q", payload)
log.Printf("Signature: %q", signature)
}
}
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