POSTForm: Return http 303 if redirect is specified (#3479)

success_action_redirect in the sent Form means that the server needs to return 303 in addition to a well specific redirection url, this commit adds this feature

cmd/bucket-handlers.go

@@ -19,6 +19,7 @@ package cmd
 import (
 	"encoding/base64"
 	"encoding/xml"
+	"fmt"
 	"io"
 	"net/http"
 	"net/url"
@@ -447,21 +448,37 @@ func (api objectAPIHandlers) PostPolicyBucketHandler(w http.ResponseWriter, r *h
 	w.Header().Set("ETag", "\""+objInfo.MD5Sum+"\"")
 	w.Header().Set("Location", getObjectLocation(bucket, object))
 
-	// Decide what http response to send depending on success_action_status parameter
-	switch formValues[http.CanonicalHeaderKey("success_action_status")] {
-	case "201":
-		resp := encodeResponse(PostResponse{
-			Bucket:   bucket,
-			Key:      object,
-			ETag:     "\"" + objInfo.MD5Sum + "\"",
-			Location: getObjectLocation(bucket, object),
-		})
-		writeResponse(w, http.StatusCreated, resp)
+	successRedirect := formValues[http.CanonicalHeaderKey("success_action_redirect")]
+	successStatus := formValues[http.CanonicalHeaderKey("success_action_status")]
 
-	case "200":
-		writeSuccessResponse(w, nil)
-	default:
+	if successStatus == "" && successRedirect == "" {
 		writeSuccessNoContent(w)
+	} else {
+		if successRedirect != "" {
+			redirectURL := successRedirect + "?" + fmt.Sprintf("bucket=%s&key=%s&etag=%s",
+				bucket,
+				getURLEncodedName(object),
+				getURLEncodedName("\""+objInfo.MD5Sum+"\""))
+
+			writeRedirectSeeOther(w, redirectURL)
+		} else {
+			// Decide what http response to send depending on success_action_status parameter
+			switch successStatus {
+			case "201":
+				resp := encodeResponse(PostResponse{
+					Bucket:   bucket,
+					Key:      object,
+					ETag:     "\"" + objInfo.MD5Sum + "\"",
+					Location: getObjectLocation(bucket, object),
+				})
+				writeResponse(w, http.StatusCreated, resp)
+
+			case "200":
+				writeSuccessResponse(w, nil)
+			default:
+				writeSuccessNoContent(w)
+			}
+		}
 	}
 
 	// Notify object created event.