Add HTTP strict tranport security support to QNAM

HTTP Strict Transport Security (HSTS) is a web security policy that
allows a web server to declare that user agents should only interact
with it using secure HTTPS connections. HSTS is described by RFC6797.

This patch introduces a new API in Network Access Manager to enable
this policy or disable it (default - STS is disabled).

We also implement QHstsCache which caches known HTTS hosts, does
host name lookup and domain name matching; QHstsHeaderParser to
parse HSTS headers with HSTS policies.

A new autotest added to test the caching, host name matching
and headers parsing.

[ChangeLog][QtNetwork] Added HTTP Strict Transport Security to QNAM

Task-number: QTPM-238
Change-Id: Iabb5920344bf204a0d3036284f0d60675c29315c
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/network/access/qnetworkaccessmanager.h b/src/network/access/qnetworkaccessmanager.h
index c0a27100e5..143407fb25 100644
--- a/src/network/access/qnetworkaccessmanager.h
+++ b/src/network/access/qnetworkaccessmanager.h
@@ -120,6 +120,10 @@ public:
     QNetworkCookieJar *cookieJar() const;
     void setCookieJar(QNetworkCookieJar *cookieJar);
 
+    void enableStrictTransportSecurity();
+    void disableStrictTransportSecurity();
+    bool strictTransportSecurityEnabled() const;
+
     QNetworkReply *head(const QNetworkRequest &request);
     QNetworkReply *get(const QNetworkRequest &request);
     QNetworkReply *post(const QNetworkRequest &request, QIODevice *data);