Added support to specifiy custom endpoint

Signed-off-by: Keerthan Reddy Mala <keerthan.mala@gmail.com>

docs/configuration.md

@@ -90,6 +90,7 @@ information about each option that appears later in this page.
         accesskey: awsaccesskey
         secretkey: awssecretkey
         region: us-west-1
+        regionendpoint: http://myobjects.local
         bucket: bucketname
         encrypt: true
         secure: true
@@ -358,6 +359,7 @@ Permitted values are `error`, `warn`, `info` and `debug`. The default is
         accesskey: awsaccesskey
         secretkey: awssecretkey
         region: us-west-1
+        regionendpoint: http://myobjects.local
         bucket: bucketname
         encrypt: true
         secure: true
@@ -435,7 +437,7 @@ You must configure one backend; if you configure more, the registry returns an e
   </tr>
   <tr>
     <td><code>s3</code></td>
-    <td>Uses Amazon's Simple Storage Service (S3).
+    <td>Uses Amazon's Simple Storage Service (S3) and compatible Storage Services.
     See the <a href="storage-drivers/s3.md">driver's reference documentation</a>.
     </td>
   </tr>

docs/storage-drivers/s3.md

@@ -9,7 +9,7 @@ keywords = ["registry, service, driver, images, storage,  S3"]
 
 # S3 storage driver
 
-An implementation of the `storagedriver.StorageDriver` interface which uses Amazon S3 for object storage.
+An implementation of the `storagedriver.StorageDriver` interface which uses Amazon S3 or S3 compatible services for object storage.
 
 ## Parameters
 
@@ -52,6 +52,17 @@ An implementation of the `storagedriver.StorageDriver` interface which uses Amaz
       The AWS region in which your bucket exists. For the moment, the Go AWS
       library in use does not use the newer DNS based bucket routing.
     </td>
+  </tr>
+  <tr>
+    <td>
+      <code>regionendpoint</code>
+    </td>
+    <td>
+      no
+    </td>
+    <td>
+      Endpoint for S3 compatible storage services (Minio, etc)
+    </td>
   </tr>
     <tr>
     <td>
@@ -146,6 +157,8 @@ An implementation of the `storagedriver.StorageDriver` interface which uses Amaz
 
 `region`: The name of the aws region in which you would like to store objects (for example `us-east-1`). For a list of regions, you can look at http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html
 
+`regionendpoint`: (optional) Endpoint URL for S3 compatible APIs. This should not be provided when using Amazon S3.
+
 `bucket`: The name of your S3 bucket where you wish to store objects. The bucket must exist prior to the driver initialization.
 
 `encrypt`: (optional) Whether you would like your data encrypted on the server side (defaults to false if not specified).

registry/storage/driver/s3-aws/s3.go

@@ -60,6 +60,7 @@ type DriverParameters struct {
 	SecretKey      string
 	Bucket         string
 	Region         string
+	RegionEndpoint string
 	Encrypt        bool
 	Secure         bool
 	ChunkSize      int64
@@ -153,6 +154,11 @@ func FromParameters(parameters map[string]interface{}) (*Driver, error) {
 		return nil, fmt.Errorf("No bucket parameter provided")
 	}
 
+	regionEndpoint := parameters["regionendpoint"]
+	if regionEndpoint == nil {
+		regionEndpoint = ""
+	}
+
 	encryptBool := false
 	encrypt := parameters["encrypt"]
 	switch encrypt := encrypt.(type) {
@@ -240,6 +246,7 @@ func FromParameters(parameters map[string]interface{}) (*Driver, error) {
 		fmt.Sprint(secretKey),
 		fmt.Sprint(bucket),
 		region,
+		fmt.Sprint(regionEndpoint),
 		encryptBool,
 		secureBool,
 		chunkSize,
@@ -255,7 +262,9 @@ func FromParameters(parameters map[string]interface{}) (*Driver, error) {
 // bucketName
 func New(params DriverParameters) (*Driver, error) {
 	awsConfig := aws.NewConfig()
-	creds := credentials.NewChainCredentials([]credentials.Provider{
+	var creds *credentials.Credentials
+	if params.RegionEndpoint == "" {
+		creds = credentials.NewChainCredentials([]credentials.Provider{
 			&credentials.StaticProvider{
 				Value: credentials.Value{
 					AccessKeyID:     params.AccessKey,
@@ -267,10 +276,23 @@ func New(params DriverParameters) (*Driver, error) {
 			&ec2rolecreds.EC2RoleProvider{Client: ec2metadata.New(session.New())},
 		})
 
+	} else {
+		creds = credentials.NewChainCredentials([]credentials.Provider{
+			&credentials.StaticProvider{
+				Value: credentials.Value{
+					AccessKeyID:     params.AccessKey,
+					SecretAccessKey: params.SecretKey,
+				},
+			},
+			&credentials.EnvProvider{},
+		})
+		awsConfig.WithS3ForcePathStyle(true)
+		awsConfig.WithEndpoint(params.RegionEndpoint)
+	}
+
 	awsConfig.WithCredentials(creds)
 	awsConfig.WithRegion(params.Region)
 	awsConfig.WithDisableSSL(!params.Secure)
-	// awsConfig.WithMaxRetries(10)
 
 	if params.UserAgent != "" {
 		awsConfig.WithHTTPClient(&http.Client{

registry/storage/driver/s3-aws/s3_test.go

@@ -30,6 +30,7 @@ func init() {
 	secure := os.Getenv("S3_SECURE")
 	region := os.Getenv("AWS_REGION")
 	root, err := ioutil.TempDir("", "driver-")
+	regionEndpoint := os.Getenv("REGION_ENDPOINT")
 	if err != nil {
 		panic(err)
 	}
@@ -57,6 +58,7 @@ func init() {
 			secretKey,
 			bucket,
 			region,
+			regionEndpoint,
 			encryptBool,
 			secureBool,
 			minChunkSize,