ui: Show news sent with update check on start screen

* News are passed as JSON string, containing an array of news items.
* Each news item has version and content (html).
* Items can be filtered by min/max version, OS and license. The first item that fits is used.
* Items can be important, which highlights the news box.
* News are not shown if older than 5 days.

fortune cookie message = You will be financially successful in case your actions are well planned.

src/lib/LicenseChecker.cpp

@@ -24,7 +24,7 @@ std::shared_ptr<LicenseChecker> LicenseChecker::getInstance()
 	return s_instance;
 }
 
-std::string LicenseChecker::getCurrentLicenseString() const
+std::string LicenseChecker::getCurrentLicenseString()
 {
 	License license;
 	bool isLoaded = license.loadFromEncodedString(
@@ -38,7 +38,7 @@ std::string LicenseChecker::getCurrentLicenseString() const
 	return "";
 }
 
-void LicenseChecker::saveCurrentLicenseString(const std::string& licenseString) const
+void LicenseChecker::saveCurrentLicenseString(const std::string& licenseString)
 {
 	License license;
 	bool isLoaded = license.loadFromString(licenseString);
@@ -55,7 +55,7 @@ bool LicenseChecker::isCurrentLicenseValid()
 	return checkCurrentLicense() == LICENSE_VALID;
 }
 
-LicenseChecker::LicenseState LicenseChecker::checkCurrentLicense() const
+LicenseChecker::LicenseState LicenseChecker::checkCurrentLicense()
 {
 	ApplicationSettings* appSettings = ApplicationSettings::getInstance().get();
 	if (appSettings == nullptr)
@@ -96,7 +96,7 @@ LicenseChecker::LicenseState LicenseChecker::checkCurrentLicense() const
 	return checkLicense(license);
 }
 
-LicenseChecker::LicenseState LicenseChecker::checkLicenseString(const std::string& licenseString) const
+LicenseChecker::LicenseState LicenseChecker::checkLicenseString(const std::string& licenseString)
 {
 	if (licenseString.size() == 0)
 	{
@@ -115,7 +115,7 @@ LicenseChecker::LicenseState LicenseChecker::checkLicenseString(const std::strin
 	return checkLicense(license);
 }
 
-MessageEnteredLicense::LicenseType LicenseChecker::getCurrentLicenseType() const
+MessageEnteredLicense::LicenseType LicenseChecker::getCurrentLicenseType()
 {
 	License license;
 	bool isLoaded = license.loadFromEncodedString(
@@ -143,7 +143,7 @@ MessageEnteredLicense::LicenseType LicenseChecker::getCurrentLicenseType() const
 	return MessageEnteredLicense::LICENSE_COMMERCIAL;
 }
 
-MessageEnteredLicense::LicenseType LicenseChecker::getLicenseType(const std::string& licenseString) const
+MessageEnteredLicense::LicenseType LicenseChecker::getLicenseType(const std::string& licenseString)
 {
 	if (licenseString.size() == 0)
 	{
@@ -174,11 +174,28 @@ MessageEnteredLicense::LicenseType LicenseChecker::getLicenseType(const std::str
 	return MessageEnteredLicense::LICENSE_COMMERCIAL;
 }
 
+std::string LicenseChecker::getCurrentLicenseTypeString()
+{
+	// WARNING: Don't change these string. The server API relies on them.
+	switch (getCurrentLicenseType())
+	{
+		case MessageEnteredLicense::LICENSE_NONE:
+		case MessageEnteredLicense::LICENSE_NON_COMMERCIAL:
+			return "private";
+		case MessageEnteredLicense::LICENSE_TEST:
+			return "test";
+		case MessageEnteredLicense::LICENSE_COMMERCIAL:
+			return "commercial";
+	}
+
+	return "private";
+}
+
 LicenseChecker::LicenseChecker()
 {
 }
 
-LicenseChecker::LicenseState LicenseChecker::checkLicense(License& license) const
+LicenseChecker::LicenseState LicenseChecker::checkLicense(License& license)
 {
 	if (license.isExpired())
 	{

src/lib/LicenseChecker.h

@@ -23,22 +23,24 @@ public:
 
 	~LicenseChecker() = default;
 
-	std::string getCurrentLicenseString() const;
-	void saveCurrentLicenseString(const std::string& licenseString) const;
+	static std::string getCurrentLicenseString();
+	static void saveCurrentLicenseString(const std::string& licenseString);
 
-	bool isCurrentLicenseValid();
-	LicenseState checkCurrentLicense() const;
-	LicenseState checkLicenseString(const std::string& licenseString) const;
+	static bool isCurrentLicenseValid();
+	static LicenseState checkCurrentLicense();
+	static LicenseState checkLicenseString(const std::string& licenseString);
 
-	MessageEnteredLicense::LicenseType getCurrentLicenseType() const;
-	MessageEnteredLicense::LicenseType getLicenseType(const std::string& licenseString) const;
+	static MessageEnteredLicense::LicenseType getCurrentLicenseType();
+	static MessageEnteredLicense::LicenseType getLicenseType(const std::string& licenseString);
+
+	static std::string getCurrentLicenseTypeString();
 
 private:
 	LicenseChecker();
 	LicenseChecker(const LicenseChecker&) = delete;
 	void operator=(const LicenseChecker&) = delete;
 
-	LicenseState checkLicense(License& license) const;
+	static LicenseState checkLicense(License& license);
 
 	static std::shared_ptr<LicenseChecker> s_instance;
 };

src/lib/settings/ApplicationSettings.cpp

@@ -597,6 +597,16 @@ Version ApplicationSettings::getUpdateVersion() const
 	return Version::fromString(getValue<std::string>("user/update_check/update_version", "2017.1.0"));
 }
 
+std::string ApplicationSettings::getUpdateNews() const
+{
+	return getValue<std::string>("user/update_check/news", "");
+}
+
+void ApplicationSettings::setUpdateNews(const std::string& news)
+{
+	setValue<std::string>("user/update_check/news", news);
+}
+
 void ApplicationSettings::setUpdateVersion(const Version& version)
 {
 	if (version.isValid())

src/lib/settings/ApplicationSettings.h

@@ -167,6 +167,9 @@ public:
 	Version getUpdateVersion() const;
 	void setUpdateVersion(const Version& version);
 
+	std::string getUpdateNews() const;
+	void setUpdateNews(const std::string& news);
+
 	bool getSeenErrorHelpMessage() const;
 	void setSeenErrorHelpMessage(bool seen);