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