config bucket and region for s3 uploader

this is to support cn-north-1 region as it can get s3 url programatically.
also keeps support 'bucket_url' for backward compatiblity

conf/defaults.ini

@@ -458,7 +458,8 @@ url = https://grafana.com
 provider =
 
 [external_image_storage.s3]
-bucket_url =
+bucket =
+region =
 access_key =
 secret_key =
 

conf/sample.ini

@@ -403,7 +403,8 @@
 ;provider =
 
 [external_image_storage.s3]
-;bucket_url =
+;bucket =
+;region =
 ;access_key =
 ;secret_key =
 

docs/sources/installation/configuration.md

@@ -648,12 +648,16 @@ These options control how images should be made public so they can be shared on
 You can choose between (s3, webdav). If left empty Grafana will ignore the upload action.
 
 ## [external_image_storage.s3]
+### bucket
+Bucket name for S3. e.g. grafana.snapshot
+### region
+Region name for S3. e.g. 'us-east-1', 'cn-north-1', etc
 
 ### bucket_url
+(for backward compatibility, only works when no bucket or region are configured)
 Bucket URL for S3. AWS region can be specified within URL or defaults to 'us-east-1', e.g.
 - http://grafana.s3.amazonaws.com/
 - https://grafana.s3-ap-southeast-2.amazonaws.com/
-- https://grafana.s3-cn-north-1.amazonaws.com.cn
 
 ### access_key
 Access key. e.g. AAAAAAAAAAAAAAAAAAAA

pkg/components/imguploader/imguploader.go

@@ -27,15 +27,21 @@ func NewImageUploader() (ImageUploader, error) {
 			return nil, err
 		}
 
+		bucket := s3sec.Key("bucket").MustString("")
+		region := s3sec.Key("region").MustString("")
 		bucketUrl := s3sec.Key("bucket_url").MustString("")
 		accessKey := s3sec.Key("access_key").MustString("")
 		secretKey := s3sec.Key("secret_key").MustString("")
-		info, err := getRegionAndBucketFromUrl(bucketUrl)
-		if err != nil {
-			return nil, err
+		if bucket == "" || region == "" {
+			info, err := getRegionAndBucketFromUrl(bucketUrl)
+			if err != nil {
+				return nil, err
+			}
+			bucket = info.bucket
+			region = info.region
 		}
 
-		return NewS3Uploader(info.region, info.bucket, "public-read", accessKey, secretKey), nil
+		return NewS3Uploader(region, bucket, "public-read", accessKey, secretKey), nil
 	case "webdav":
 		webdavSec, err := setting.Cfg.GetSection("external_image_storage.webdav")
 		if err != nil {