Add v4 sig to http cache (#741)

* FS-9676 [mod_http_cache] Support for AWS Signature version 4 and drop support for version 2

Co-authored-by: baonq-me <quocbao747@gmail.com>

src/mod/applications/mod_http_cache/common.h

@@ -1,10 +1,40 @@
+/*
+ * aws.h for FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
+ * Copyright (C) 2013-2014, Grasshopper
+ *
+ * Version: MPL 1.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (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.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is aws.h for FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
+ *
+ * The Initial Developer of the Original Code is Grasshopper
+ * Portions created by the Initial Developer are Copyright (C)
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ * Chris Rienzo <chris.rienzo@grasshopper.com>
+ * Quoc-Bao Nguyen <baonq5@vng.com.vn>
+ *
+ * common.h - Functions common to the store provider
+ *
+ */
+
 #ifndef COMMON_H
 #define COMMON_H
 
 #include <switch.h>
 
 /**
- * An http profile.  Defines optional credentials
+ * An http profile. Defines optional credentials
  * for access to Amazon S3 and Azure Blob Service
  */
 struct http_profile {
@@ -12,6 +42,8 @@ struct http_profile {
 	char *aws_s3_access_key_id;
 	char *secret_access_key;
 	char *base_domain;
+	char *region;            // AWS region. Used by AWS S3
+	switch_time_t expires;   // Expiration time in seconds for URL signature. Default is 604800 seconds. Used by AWS S3
 	switch_size_t bytes_per_block;
 
 	// function to be called to add the profile specific headers to the GET/PUT requests