docs: add AWS HTTP v4 Signature

docs/cmdline-opts/Makefile.inc

@@ -236,6 +236,7 @@ DPAGES =					\
   url.d use-ascii.d				\
   user-agent.d					\
   user.d verbose.d				\
+  aws-sigv4.d                                   \
   version.d					\
   write-out.d					\
   xattr.d

docs/cmdline-opts/aws-sigv4.d

@@ -0,0 +1,10 @@
+Long: aws-sigv4
+Arg: <provider1[:provider2]>
+Help: provides AWS V4 signature authentication
+Category: auth http
+Added: 7.75.0
+---
+provides AWS V4 signature authentication on HTTPS header:
+
+The provider argument is a string that is used by the algorithm when creating
+outgoing authentication headers.

docs/libcurl/curl_easy_setopt.3

@@ -423,6 +423,8 @@ RTSP Transport: header. See \fICURLOPT_RTSP_TRANSPORT(3)\fP
 Client CSEQ number. See \fICURLOPT_RTSP_CLIENT_CSEQ(3)\fP
 .IP CURLOPT_RTSP_SERVER_CSEQ
 CSEQ number for RTSP Server->Client request. See \fICURLOPT_RTSP_SERVER_CSEQ(3)\fP
+.IP CURLOPT_AWS_SIGV4
+AWS HTTP V4 Signature. See \fICURLOPT_AWS_SIGV4(3)\fP
 .SH PROTOCOL OPTIONS
 .IP CURLOPT_TRANSFERTEXT
 Use text transfer. See \fICURLOPT_TRANSFERTEXT(3)\fP

docs/libcurl/opts/CURLOPT_AWS_SIGV4.3

@@ -0,0 +1,82 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_AWS_SIGV4 3 "03 Jun 2020" "libcurl 7.72.0" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_AWS_SIGV4 \- V4 signature
+.SH SYNOPSIS
+.nf
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_AWS_SIGV4,
+                          char *providers_infos);
+.SH DESCRIPTION
+provides AWS V4 signature authentication on HTTPS header
+
+The provider argument is a string that is merged to some authentication
+parameters use by the algorithm.
+It's used by "Algorithm", "date", "request type", "signed headers" arguments,
+
+NOTE: This call set CURLOPT_HTTPAUTH to CURLAUTH_AWS_SIGV4.
+Calling CURLOPT_HTTPAUTH with CURLAUTH_AWS_SIGV4 is the same as calling
+this with "aws:amz" in paramater.
+
+Example with "Test:Try", when curl will do the algorithm, it will Generate:
+"TEST-HMAC-SHA256" for "Algorithm"
+"x-try-date" and "X-Try-Date" for "date"
+"test4_request" for "request type"
+"SignedHeaders=content-type;host;x-try-date" for "signed headers"
+
+If you use just "test", instead of "test:try",
+test will be use for every strings generated
+
+.SH DEFAULT
+NULL
+.SH PROTOCOLS
+HTTP
+.SH EXAMPLE
+.nf
+CURL *curl = curl_easy_init();
+
+struct curl_slist *list = NULL;
+
+if(curl) {
+  curl_easy_setopt(curl, CURLOPT_URL,
+  "https://api_type.region.example.com/uri");
+
+  curl_easy_setopt(c, CURLOPT_AWS_SIGV4, "xxx:yyy");
+  curl_easy_setopt(c, CURLOPT_USERPWD, "MY_ACCESS_KEY:MY_SECRET_KEY");
+  curl_easy_perform(curl);
+}
+.fi
+
+.SH AVAILABILITY
+Added in 7.75.0
+
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+
+.SH NOTES
+this option overrides the other auth types you might have set in CURL_HTTPAUTH which should be highlighted as this makes this auth method special. It could probably also be mentioned that this method can't be combined with other auth types.
+
+.SH "SEE ALSO"
+.BR CURLOPT_HEADEROPT "(3), " CURLOPT_HTTPHEADER "(3), "

docs/libcurl/opts/CURLOPT_HTTPAUTH.3

@@ -98,6 +98,9 @@ it finds most secure.
 This is a meta symbol. OR this value together with a single specific auth
 value to force libcurl to probe for un-restricted auth and if not, only that
 single auth algorithm is acceptable.
+.IP CURLAUTH_AWS_SIGV4
+provides AWS V4 signature authentication on HTTPS header
+see \fICURLOPT_AWS_SIGV4(3)\fP.
 .SH DEFAULT
 CURLAUTH_BASIC
 .SH PROTOCOLS
@@ -124,6 +127,8 @@ CURLAUTH_ONLY was added in 7.21.3
 CURLAUTH_NTLM_WB was added in 7.22.0
 
 CURLAUTH_BEARER was added in 7.61.0
+
+CURLAUTH_AWS_SIGV4 was added in 7.74.0
 .SH RETURN VALUE
 Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
 CURLE_NOT_BUILT_IN if the bitmask specified no supported authentication

docs/libcurl/opts/Makefile.inc

@@ -382,6 +382,7 @@ man_MANS =                                      \
   CURLOPT_USERNAME.3                            \
   CURLOPT_USERPWD.3                             \
   CURLOPT_USE_SSL.3                             \
+  CURLOPT_AWS_SIGV4.3                           \
   CURLOPT_VERBOSE.3                             \
   CURLOPT_WILDCARDMATCH.3                       \
   CURLOPT_WRITEDATA.3                           \

docs/options-in-versions

@@ -14,6 +14,7 @@
 --alt-svc                            7.64.1
 --anyauth                            7.10.6
 --append (-a)                        4.8
+--aws-sigv4                          7.75.0
 --basic                              7.10.6
 --cacert                             7.5
 --capath                             7.9.8