api: Implement bucket notification. (#2271)

* Implement basic S3 notifications through queues

Supports multiple queues and three basic queue types:

1. NilQueue -- messages don't get sent anywhere
2. LogQueue -- messages get logged
3. AmqpQueue -- messages are sent to an AMQP queue

* api: Implement bucket notification.

Supports two different queue types

- AMQP
- ElasticSearch.

* Add support for redis

handler-utils.go

@@ -17,7 +17,10 @@
 package main
 
 import (
+	"bytes"
 	"io"
+	"io/ioutil"
+	"mime/multipart"
 	"net/http"
 	"strings"
 )
@@ -95,3 +98,30 @@ func extractMetadataFromHeader(header http.Header) map[string]string {
 	// Return.
 	return metadata
 }
+
+func extractHTTPFormValues(reader *multipart.Reader) (io.Reader, map[string]string, error) {
+	/// HTML Form values
+	formValues := make(map[string]string)
+	filePart := new(bytes.Buffer)
+	var err error
+	for err == nil {
+		var part *multipart.Part
+		part, err = reader.NextPart()
+		if part != nil {
+			if part.FileName() == "" {
+				var buffer []byte
+				buffer, err = ioutil.ReadAll(part)
+				if err != nil {
+					return nil, nil, err
+				}
+				formValues[http.CanonicalHeaderKey(part.FormName())] = string(buffer)
+			} else {
+				if _, err = io.Copy(filePart, part); err != nil {
+					return nil, nil, err
+				}
+			}
+		}
+	}
+	return filePart, formValues, nil
+
+}