make notification as separate package (#5294)

* Remove old notification files

* Add net package

* Add event package

* Modify minio to take new notification system

cmd/api-errors.go

@@ -1,5 +1,5 @@
 /*
- * Minio Cloud Storage, (C) 2015 Minio, Inc.
+ * Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,6 +23,7 @@ import (
 
 	"github.com/minio/minio/pkg/auth"
 	"github.com/minio/minio/pkg/errors"
+	"github.com/minio/minio/pkg/event"
 	"github.com/minio/minio/pkg/hash"
 )
 
@@ -950,6 +951,28 @@ func toAPIErrorCode(err error) (apiErr APIErrorCode) {
 		apiErr = ErrPartsSizeUnequal
 	case BucketPolicyNotFound:
 		apiErr = ErrNoSuchBucketPolicy
+	case *event.ErrInvalidEventName:
+		apiErr = ErrEventNotification
+	case *event.ErrInvalidARN:
+		apiErr = ErrARNNotification
+	case *event.ErrARNNotFound:
+		apiErr = ErrARNNotification
+	case *event.ErrUnknownRegion:
+		apiErr = ErrRegionNotification
+	case *event.ErrInvalidFilterName:
+		apiErr = ErrFilterNameInvalid
+	case *event.ErrFilterNamePrefix:
+		apiErr = ErrFilterNamePrefix
+	case *event.ErrFilterNameSuffix:
+		apiErr = ErrFilterNameSuffix
+	case *event.ErrInvalidFilterValue:
+		apiErr = ErrFilterValueInvalid
+	case *event.ErrDuplicateEventName:
+		apiErr = ErrOverlappingConfigs
+	case *event.ErrDuplicateQueueConfiguration:
+		apiErr = ErrOverlappingFilterNotification
+	case *event.ErrUnsupportedConfiguration:
+		apiErr = ErrUnsupportedNotification
 	default:
 		apiErr = ErrInternalError
 	}