54ae545ed3
The goal is to free up the distribution/registry package to include common registry types. This moves the webapp definitions out of the way to allow for this change in the future. Signed-off-by: Stephen J Day <stephen.day@docker.com>
73 lines
1.7 KiB
Go
73 lines
1.7 KiB
Go
package handlers
|
|
|
|
import (
|
|
"crypto/hmac"
|
|
"crypto/sha256"
|
|
"encoding/base64"
|
|
"encoding/json"
|
|
"fmt"
|
|
"time"
|
|
)
|
|
|
|
// layerUploadState captures the state serializable state of the layer upload.
|
|
type layerUploadState struct {
|
|
// name is the primary repository under which the layer will be linked.
|
|
Name string
|
|
|
|
// UUID identifies the upload.
|
|
UUID string
|
|
|
|
// offset contains the current progress of the upload.
|
|
Offset int64
|
|
|
|
// StartedAt is the original start time of the upload.
|
|
StartedAt time.Time
|
|
}
|
|
|
|
type hmacKey string
|
|
|
|
// unpackUploadState unpacks and validates the layer upload state from the
|
|
// token, using the hmacKey secret.
|
|
func (secret hmacKey) unpackUploadState(token string) (layerUploadState, error) {
|
|
var state layerUploadState
|
|
|
|
tokenBytes, err := base64.URLEncoding.DecodeString(token)
|
|
if err != nil {
|
|
return state, err
|
|
}
|
|
mac := hmac.New(sha256.New, []byte(secret))
|
|
|
|
if len(tokenBytes) < mac.Size() {
|
|
return state, fmt.Errorf("Invalid token")
|
|
}
|
|
|
|
macBytes := tokenBytes[:mac.Size()]
|
|
messageBytes := tokenBytes[mac.Size():]
|
|
|
|
mac.Write(messageBytes)
|
|
if !hmac.Equal(mac.Sum(nil), macBytes) {
|
|
return state, fmt.Errorf("Invalid token")
|
|
}
|
|
|
|
if err := json.Unmarshal(messageBytes, &state); err != nil {
|
|
return state, err
|
|
}
|
|
|
|
return state, nil
|
|
}
|
|
|
|
// packUploadState packs the upload state signed with and hmac digest using
|
|
// the hmacKey secret, encoding to url safe base64. The resulting token can be
|
|
// used to share data with minimized risk of external tampering.
|
|
func (secret hmacKey) packUploadState(lus layerUploadState) (string, error) {
|
|
mac := hmac.New(sha256.New, []byte(secret))
|
|
p, err := json.Marshal(lus)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
mac.Write(p)
|
|
|
|
return base64.URLEncoding.EncodeToString(append(mac.Sum(nil), p...)), nil
|
|
}
|