[VOL-4291] Rw-core updates for gRPC migration
Change-Id: I8d5a554409115b29318089671ca4e1ab3fa98810
diff --git a/vendor/github.com/coreos/etcd/pkg/cors/cors.go b/vendor/github.com/coreos/etcd/pkg/cors/cors.go
new file mode 100644
index 0000000..0c64f16
--- /dev/null
+++ b/vendor/github.com/coreos/etcd/pkg/cors/cors.go
@@ -0,0 +1,90 @@
+// Copyright 2015 The etcd Authors
+//
+// 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 cors handles cross-origin HTTP requests (CORS).
+package cors
+
+import (
+ "fmt"
+ "net/http"
+ "net/url"
+ "sort"
+ "strings"
+)
+
+type CORSInfo map[string]bool
+
+// Set implements the flag.Value interface to allow users to define a list of CORS origins
+func (ci *CORSInfo) Set(s string) error {
+ m := make(map[string]bool)
+ for _, v := range strings.Split(s, ",") {
+ v = strings.TrimSpace(v)
+ if v == "" {
+ continue
+ }
+ if v != "*" {
+ if _, err := url.Parse(v); err != nil {
+ return fmt.Errorf("Invalid CORS origin: %s", err)
+ }
+ }
+ m[v] = true
+
+ }
+ *ci = CORSInfo(m)
+ return nil
+}
+
+func (ci *CORSInfo) String() string {
+ o := make([]string, 0)
+ for k := range *ci {
+ o = append(o, k)
+ }
+ sort.StringSlice(o).Sort()
+ return strings.Join(o, ",")
+}
+
+// OriginAllowed determines whether the server will allow a given CORS origin.
+func (c CORSInfo) OriginAllowed(origin string) bool {
+ return c["*"] || c[origin]
+}
+
+type CORSHandler struct {
+ Handler http.Handler
+ Info *CORSInfo
+}
+
+// addHeader adds the correct cors headers given an origin
+func (h *CORSHandler) addHeader(w http.ResponseWriter, origin string) {
+ w.Header().Add("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE")
+ w.Header().Add("Access-Control-Allow-Origin", origin)
+ w.Header().Add("Access-Control-Allow-Headers", "accept, content-type, authorization")
+}
+
+// ServeHTTP adds the correct CORS headers based on the origin and returns immediately
+// with a 200 OK if the method is OPTIONS.
+func (h *CORSHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+ // Write CORS header.
+ if h.Info.OriginAllowed("*") {
+ h.addHeader(w, "*")
+ } else if origin := req.Header.Get("Origin"); h.Info.OriginAllowed(origin) {
+ h.addHeader(w, origin)
+ }
+
+ if req.Method == "OPTIONS" {
+ w.WriteHeader(http.StatusOK)
+ return
+ }
+
+ h.Handler.ServeHTTP(w, req)
+}