124 lines
3.3 KiB
Go
124 lines
3.3 KiB
Go
package storage
|
|
|
|
import (
|
|
"crypto/x509"
|
|
"encoding/pem"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"net/http"
|
|
"net/url"
|
|
"time"
|
|
|
|
"github.com/AdRoll/goamz/cloudfront"
|
|
"github.com/docker/distribution"
|
|
storagedriver "github.com/docker/distribution/registry/storage/driver"
|
|
)
|
|
|
|
// cloudFrontLayerHandler provides an simple implementation of layerHandler that
|
|
// constructs temporary signed CloudFront URLs from the storagedriver layer URL,
|
|
// then issues HTTP Temporary Redirects to this CloudFront content URL.
|
|
type cloudFrontLayerHandler struct {
|
|
cloudfront *cloudfront.CloudFront
|
|
delegateLayerHandler *delegateLayerHandler
|
|
duration time.Duration
|
|
}
|
|
|
|
var _ LayerHandler = &cloudFrontLayerHandler{}
|
|
|
|
// newCloudFrontLayerHandler constructs and returns a new CloudFront
|
|
// LayerHandler implementation.
|
|
// Required options: baseurl, privatekey, keypairid
|
|
func newCloudFrontLayerHandler(storageDriver storagedriver.StorageDriver, options map[string]interface{}) (LayerHandler, error) {
|
|
base, ok := options["baseurl"]
|
|
if !ok {
|
|
return nil, fmt.Errorf("No baseurl provided")
|
|
}
|
|
baseURL, ok := base.(string)
|
|
if !ok {
|
|
return nil, fmt.Errorf("baseurl must be a string")
|
|
}
|
|
pk, ok := options["privatekey"]
|
|
if !ok {
|
|
return nil, fmt.Errorf("No privatekey provided")
|
|
}
|
|
pkPath, ok := pk.(string)
|
|
if !ok {
|
|
return nil, fmt.Errorf("privatekey must be a string")
|
|
}
|
|
kpid, ok := options["keypairid"]
|
|
if !ok {
|
|
return nil, fmt.Errorf("No keypairid provided")
|
|
}
|
|
keypairID, ok := kpid.(string)
|
|
if !ok {
|
|
return nil, fmt.Errorf("keypairid must be a string")
|
|
}
|
|
|
|
pkBytes, err := ioutil.ReadFile(pkPath)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("Failed to read privatekey file: %s", err)
|
|
}
|
|
|
|
block, _ := pem.Decode([]byte(pkBytes))
|
|
if block == nil {
|
|
return nil, fmt.Errorf("Failed to decode private key as an rsa private key")
|
|
}
|
|
privateKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
lh, err := newDelegateLayerHandler(storageDriver, options)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
dlh := lh.(*delegateLayerHandler)
|
|
|
|
cf := cloudfront.New(baseURL, privateKey, keypairID)
|
|
|
|
duration := 20 * time.Minute
|
|
d, ok := options["duration"]
|
|
if ok {
|
|
switch d := d.(type) {
|
|
case time.Duration:
|
|
duration = d
|
|
case string:
|
|
dur, err := time.ParseDuration(d)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("Invalid duration: %s", err)
|
|
}
|
|
duration = dur
|
|
}
|
|
}
|
|
|
|
return &cloudFrontLayerHandler{cloudfront: cf, delegateLayerHandler: dlh, duration: duration}, nil
|
|
}
|
|
|
|
// Resolve returns an http.Handler which can serve the contents of the given
|
|
// Layer, or an error if not supported by the storagedriver.
|
|
func (lh *cloudFrontLayerHandler) Resolve(layer distribution.Layer) (http.Handler, error) {
|
|
layerURLStr, err := lh.delegateLayerHandler.urlFor(layer, nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
layerURL, err := url.Parse(layerURLStr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
cfURL, err := lh.cloudfront.CannedSignedURL(layerURL.Path, "", time.Now().Add(lh.duration))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
http.Redirect(w, r, cfURL, http.StatusTemporaryRedirect)
|
|
}), nil
|
|
}
|
|
|
|
// init registers the cloudfront layerHandler backend.
|
|
func init() {
|
|
RegisterLayerHandler("cloudfront", LayerHandlerInitFunc(newCloudFrontLayerHandler))
|
|
}
|