From ce9f500a31419d56e4fa12dc54344a3f4daade35 Mon Sep 17 00:00:00 2001
From: Ahmet Alp Balkan <ahmetalpbalkan@gmail.com>
Date: Mon, 23 Mar 2015 18:20:06 -0700
Subject: [PATCH] storage/driver/azure: Allow non-default realms

This enables Azure storage driver to be used with non-default
cloud endpoints like Azure China or Azure Government that does
not use `.blob.core.windows.net` FQDN suffix.

Signed-off-by: Ahmet Alp Balkan <ahmetalpbalkan@gmail.com>
---
 doc/storagedriver/azure.md                  |  1 +
 registry/storage/driver/azure/azure.go      | 14 ++++++++++----
 registry/storage/driver/azure/azure_test.go |  6 +++++-
 3 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/doc/storagedriver/azure.md b/doc/storagedriver/azure.md
index f0fd296dd..3e27767ed 100644
--- a/doc/storagedriver/azure.md
+++ b/doc/storagedriver/azure.md
@@ -10,6 +10,7 @@ The following parameters must be used to authenticate and configure the storage
 * `accountname`: Name of the Azure Storage Account.
 * `accountkey`: Primary or Secondary Key for the Storage Account.
 * `container`: Name of the root storage container in which all registry data will be stored. Must comply the storage container name [requirements][create-container-api].
+* `realm`: (optional) Domain name suffix for the Storage Service API endpoint. Defaults to `core.windows.net`. For example realm for "Azure in China" would be `core.chinacloudapi.cn` and realm for "Azure Government" would be `core.usgovcloudapi.net`.
 
 
 [azure-blob-storage]: http://azure.microsoft.com/en-us/services/storage/
diff --git a/registry/storage/driver/azure/azure.go b/registry/storage/driver/azure/azure.go
index 6ccbff40b..57d8acab5 100644
--- a/registry/storage/driver/azure/azure.go
+++ b/registry/storage/driver/azure/azure.go
@@ -24,6 +24,7 @@ const (
 	paramAccountName = "accountname"
 	paramAccountKey  = "accountkey"
 	paramContainer   = "container"
+	paramRealm       = "realm"
 )
 
 type driver struct {
@@ -64,12 +65,17 @@ func FromParameters(parameters map[string]interface{}) (*Driver, error) {
 		return nil, fmt.Errorf("No %s parameter provided", paramContainer)
 	}
 
-	return New(fmt.Sprint(accountName), fmt.Sprint(accountKey), fmt.Sprint(container))
+	realm, ok := parameters[paramRealm]
+	if !ok || fmt.Sprint(realm) == "" {
+		realm = azure.DefaultBaseUrl
+	}
+
+	return New(fmt.Sprint(accountName), fmt.Sprint(accountKey), fmt.Sprint(container), fmt.Sprint(realm))
 }
 
 // New constructs a new Driver with the given Azure Storage Account credentials
-func New(accountName, accountKey, container string) (*Driver, error) {
-	api, err := azure.NewBasicClient(accountName, accountKey)
+func New(accountName, accountKey, container, realm string) (*Driver, error) {
+	api, err := azure.NewClient(accountName, accountKey, realm, azure.DefaultApiVersion, true)
 	if err != nil {
 		return nil, err
 	}
@@ -343,5 +349,5 @@ func (d *driver) listBlobs(container, virtPath string) ([]string, error) {
 
 func is404(err error) bool {
 	e, ok := err.(azure.StorageServiceError)
-	return ok && e.StatusCode == 404
+	return ok && e.StatusCode == http.StatusNotFound
 }
diff --git a/registry/storage/driver/azure/azure_test.go b/registry/storage/driver/azure/azure_test.go
index a8fdf3e90..4990ba19b 100644
--- a/registry/storage/driver/azure/azure_test.go
+++ b/registry/storage/driver/azure/azure_test.go
@@ -15,6 +15,7 @@ const (
 	envAccountName = "AZURE_STORAGE_ACCOUNT_NAME"
 	envAccountKey  = "AZURE_STORAGE_ACCOUNT_KEY"
 	envContainer   = "AZURE_STORAGE_CONTAINER"
+	envRealm       = "AZURE_STORAGE_REALM"
 )
 
 // Hook up gocheck into the "go test" runner.
@@ -25,6 +26,7 @@ func init() {
 		accountName string
 		accountKey  string
 		container   string
+		realm       string
 	)
 
 	config := []struct {
@@ -34,6 +36,7 @@ func init() {
 		{envAccountName, &accountName},
 		{envAccountKey, &accountKey},
 		{envContainer, &container},
+		{envRealm, &realm},
 	}
 
 	missing := []string{}
@@ -45,7 +48,7 @@ func init() {
 	}
 
 	azureDriverConstructor := func() (storagedriver.StorageDriver, error) {
-		return New(accountName, accountKey, container)
+		return New(accountName, accountKey, container, realm)
 	}
 
 	// Skip Azure storage driver tests if environment variable parameters are not provided
@@ -61,5 +64,6 @@ func init() {
 	// 	paramAccountName: accountName,
 	// 	paramAccountKey:  accountKey,
 	// 	paramContainer:   container,
+	// 	paramRealm:       realm,
 	// }, skipCheck)
 }