move s3 related constants from package http to s3_constants

weed/s3api/s3_constants/header.go

@@ -0,0 +1,66 @@
+/*
+ * MinIO Cloud Storage, (C) 2019 MinIO, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package s3_constants
+
+import (
+	"github.com/gorilla/mux"
+	"net/http"
+	"strings"
+)
+
+// Standard S3 HTTP request constants
+const (
+	// S3 storage class
+	AmzStorageClass = "x-amz-storage-class"
+
+	// S3 user-defined metadata
+	AmzUserMetaPrefix    = "X-Amz-Meta-"
+	AmzUserMetaDirective = "X-Amz-Metadata-Directive"
+
+	// S3 object tagging
+	AmzObjectTagging          = "X-Amz-Tagging"
+	AmzObjectTaggingPrefix    = "X-Amz-Tagging-"
+	AmzObjectTaggingDirective = "X-Amz-Tagging-Directive"
+	AmzTagCount               = "x-amz-tagging-count"
+)
+
+// Non-Standard S3 HTTP request constants
+const (
+	AmzIdentityId = "s3-identity-id"
+	AmzAuthType   = "s3-auth-type"
+	AmzIsAdmin    = "s3-is-admin" // only set to http request header as a context
+)
+
+func GetBucketAndObject(r *http.Request) (bucket, object string) {
+	vars := mux.Vars(r)
+	bucket = vars["bucket"]
+	object = vars["object"]
+	if !strings.HasPrefix(object, "/") {
+		object = "/" + object
+	}
+
+	return
+}
+
+var PassThroughHeaders = map[string]string{
+	"response-cache-control":       "Cache-Control",
+	"response-content-disposition": "Content-Disposition",
+	"response-content-encoding":    "Content-Encoding",
+	"response-content-language":    "Content-Language",
+	"response-content-type":        "Content-Type",
+	"response-expires":             "Expires",
+}