http: improve AWS HTTP v4 Signature auth

- Add support services without region and service prefixes in
the URL endpoint (ex. Min.IO, GCP, Yandex Cloud, Mail.Ru Cloud Solutions, etc)
by providing region and service parameters via aws-sigv4 option.
- Add [:region[:service]] suffix to aws-sigv4 option;
- Fix memory allocation errors.
- Refactor memory management.
- Use Curl_http_method instead() STRING_CUSTOMREQUEST.
- Refactor canonical headers generating.
- Remove repeated sha256_to_hex() usage.
- Add some docs fixes.
- Add some codestyle fixes.
- Add overloaded strndup() for debug - curl_dbg_strndup().
- Update tests.

Closes #6524

tests/data/Makefile.inc

@@ -209,7 +209,7 @@ test1800 test1801 \
 test1908 test1909 test1910 test1911 test1912 test1913 test1914 test1915 \
 test1916 test1917 test1918 \
 \
-test1933 \
+test1933 test1934 test1935 test1936 \
 \
 test2000 test2001 test2002 test2003 test2004 test2005 test2006 test2007 \
 test2008 test2009 test2010 test2011 test2012 test2013 test2014 test2015 \

tests/data/test1933

@@ -40,14 +40,14 @@ crypto
 </features>
 
 <name>
-HTTP AWS_SIGV4
+HTTP AWS_SIGV4 with one provider and auth cred via URL
 </name>
 <tool>
 lib1933
 </tool>
 
 <command>
-http://%HOSTIP:%HTTPPORT/1933/testapi/test
+http://xxx:yyy@%HOSTIP:%HTTPPORT/1933/testapi/test
 </command>
 </client>
 
@@ -61,8 +61,8 @@ http://%HOSTIP:%HTTPPORT/1933/testapi/test
 <protocol>
 GET /1933/testapi/test HTTP/1.1
 Host: %HOSTIP:%HTTPPORT
-X-yyy-Date: 19700101T000000Z
-Authorization: XXX4-HMAC-SHA256 Credential=xxx/19700101/0/127/xxx4_request, SignedHeaders=content-type;host;x-yyy-date, Signature=b125a904e7f5cc1f553d8f3682947eb003c4ca6c504097c0dc2d9323289bfcdd
+Authorization: XXX4-HMAC-SHA256 Credential=xxx/19700101/0/127/xxx4_request, SignedHeaders=content-type;host;x-xxx-date, Signature=d2c2dff48c59ec49dc31ef94f18c5dc1ac3eae2a70d51633a4342dadc0683664
+X-Xxx-Date: 19700101T000000Z
 
 </protocol>
 </verify>

tests/data/test1934

@@ -0,0 +1,69 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+CURLOPT_AWS_SIGV4
+</keywords>
+</info>
+
+# Server-side
+<reply>
+<data nocheck="yes">
+HTTP/1.1 302 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Type: text/html
+Content-Length: 0
+Location: /19340002
+
+</data>
+<data2>
+HTTP/1.1 200 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Type: text/html
+Content-Length: 0
+
+</data>
+</reply>
+
+# Client-side
+<client>
+<server>
+http
+</server>
+# this relies on the debug feature which allow to set the time
+<features>
+SSL
+debug
+crypto
+</features>
+
+<name>
+HTTP AWS_SIGV4 with two providers
+</name>
+<tool>
+lib1934
+</tool>
+
+<command>
+http://%HOSTIP:%HTTPPORT/1934/testapi/test
+</command>
+</client>
+
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+^User-Agent:.*
+^Content-Type:.*
+^Accept:.*
+</strip>
+<protocol>
+GET /1934/testapi/test HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+Authorization: XXX4-HMAC-SHA256 Credential=xxx/19700101/0/127/xxx4_request, SignedHeaders=content-type;host;x-yyy-date, Signature=938937ca7da6bb3dbf15e30928265ec6f061532d035d2afda92fa7cb10feb196
+X-Yyy-Date: 19700101T000000Z
+
+</protocol>
+</verify>
+</testcase>

tests/data/test1935

@@ -0,0 +1,69 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+CURLOPT_AWS_SIGV4
+</keywords>
+</info>
+
+# Server-side
+<reply>
+<data nocheck="yes">
+HTTP/1.1 302 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Type: text/html
+Content-Length: 0
+Location: /19350002
+
+</data>
+<data2>
+HTTP/1.1 200 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Type: text/html
+Content-Length: 0
+
+</data>
+</reply>
+
+# Client-side
+<client>
+<server>
+http
+</server>
+# this relies on the debug feature which allow to set the time
+<features>
+SSL
+debug
+crypto
+</features>
+
+<name>
+HTTP AWS_SIGV4 with two providers and region
+</name>
+<tool>
+lib1935
+</tool>
+
+<command>
+http://%HOSTIP:%HTTPPORT/1935/testapi/test
+</command>
+</client>
+
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+^User-Agent:.*
+^Content-Type:.*
+^Accept:.*
+</strip>
+<protocol>
+GET /1935/testapi/test HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+Authorization: XXX4-HMAC-SHA256 Credential=xxx/19700101/rrr/127/xxx4_request, SignedHeaders=content-type;host;x-yyy-date, Signature=240750deb9263d4c8ece71c016f3919b56e518249390ef075740f94ef8df846f
+X-Yyy-Date: 19700101T000000Z
+
+</protocol>
+</verify>
+</testcase>

tests/data/test1936

@@ -0,0 +1,69 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+CURLOPT_AWS_SIGV4
+</keywords>
+</info>
+
+# Server-side
+<reply>
+<data nocheck="yes">
+HTTP/1.1 302 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Type: text/html
+Content-Length: 0
+Location: /19360002
+
+</data>
+<data2>
+HTTP/1.1 200 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Type: text/html
+Content-Length: 0
+
+</data>
+</reply>
+
+# Client-side
+<client>
+<server>
+http
+</server>
+# this relies on the debug feature which allow to set the time
+<features>
+SSL
+debug
+crypto
+</features>
+
+<name>
+HTTP AWS_SIGV4 with two providers, region and service
+</name>
+<tool>
+lib1936
+</tool>
+
+<command>
+http://%HOSTIP:%HTTPPORT/1936/testapi/test
+</command>
+</client>
+
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+^User-Agent:.*
+^Content-Type:.*
+^Accept:.*
+</strip>
+<protocol>
+GET /1936/testapi/test HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+Authorization: XXX4-HMAC-SHA256 Credential=xxx/19700101/rrr/sss/xxx4_request, SignedHeaders=content-type;host;x-yyy-date, Signature=f32cf87977cea5d3274b524b53e5d28f4aac54c372f710ae0cc3a9ececaf169f
+X-Yyy-Date: 19700101T000000Z
+
+</protocol>
+</verify>
+</testcase>