logic: Trim lines and remove empty ones when checking license key

src/lib/utility/utilityString.cpp

@@ -168,4 +168,11 @@ namespace utility
 
 		return str;
 	}
+
+	std::string trim(const std::string &str)
+	{
+		auto wsfront = std::find_if_not(str.begin(), str.end(), [](int c){ return std::isspace(c); });
+		auto wsback = std::find_if_not(str.rbegin(), str.rend(), [](int c){ return std::isspace(c); }).base();
+		return (wsback <= wsfront ? std::string() : std::string(wsfront, wsback));
+	}
 }

src/lib/utility/utilityString.h

@@ -39,6 +39,7 @@ namespace utility
 
 	std::string replace(std::string str, const std::string& from, const std::string& to);
 
+	std::string trim(const std::string &str);
 
 	template <typename ContainerType>
 	ContainerType split(const std::string& str, const std::string& delimiter)

src/lib_gui/qt/window/QtLicense.cpp

@@ -38,6 +38,16 @@ void QtLicense::clear()
 	}
 }
 
+void QtLicense::load()
+{
+	clear();
+
+	if (m_licenseText)
+	{
+		m_licenseText->setText(ApplicationSettings::getInstance()->getLicenseString().c_str());
+	}
+}
+
 void QtLicense::setup()
 {
 	setStyleSheet((
@@ -67,7 +77,6 @@ void QtLicense::setup()
 
 	m_licenseText = new QTextEdit(this);
 	m_licenseText->setObjectName("licenseField");
-	m_licenseText->setText(ApplicationSettings::getInstance()->getLicenseString().c_str());
 	m_licenseText->setPlaceholderText(
 		"-----BEGIN LICENSE-----\n"
 		"Jane Doe\n"

src/lib_gui/qt/window/QtLicense.h

@@ -17,6 +17,7 @@ public:
 	QSize sizeHint() const Q_DECL_OVERRIDE;
 
 	void clear();
+	void load();
 
 	virtual void setup() override;
 

src/lib_gui/qt/window/QtMainWindow.cpp

@@ -365,6 +365,7 @@ void QtMainWindow::enterLicense()
 		connect(m_enterLicenseWindow.get(), SIGNAL(canceled()), this, SLOT(popWindow()));
 	}
 
+	m_enterLicenseWindow->load();
 	pushWindow(m_enterLicenseWindow.get());
 }
 

src/lib_license/License.cpp

@@ -1,5 +1,6 @@
 #include "License.h"
 
+#include <algorithm>
 #include <iostream>
 #include <fstream>
 #include <sstream>
@@ -15,6 +16,16 @@
 // #include "botan/rsa.h"
 // #endif
 
+namespace
+{
+    std::string trim(const std::string &str)
+    {
+        auto wsfront = std::find_if_not(str.begin(), str.end(), [](int c){ return std::isspace(c); });
+        auto wsback = std::find_if_not(str.rbegin(), str.rend(), [](int c){ return std::isspace(c); }).base();
+        return (wsback <= wsfront ? std::string() : std::string(wsfront, wsback));
+    }
+}
+
 License::License()
 {
 }
@@ -119,9 +130,14 @@ bool License::load(std::istream& stream)
 {
     lines.clear();
     std::string line;
+
     while (getline(stream, line, '\n'))
     {
-        lines.push_back(line);
+        std::string l = trim(line);
+        if (l.size())
+        {
+            lines.push_back(l);
+        }
     }
 
     if (lines.front() != BEGIN_LICENSE)