Handle case where private keys are multiline

src/mainwindow.cpp

@@ -830,7 +830,7 @@ void MainWindow::doImport(QList<QString>* keys) {
     keys->pop_front();
     bool rescan = keys->isEmpty();
 
-    if (key.startsWith("S") ||
+    if (key.startsWith("SK") ||
         key.startsWith("secret")) { // Z key
         rpc->importZPrivKey(key, rescan, [=] (auto) { this->doImport(keys); });                   
     } else {
@@ -954,6 +954,16 @@ void MainWindow::importPrivKey() {
             return key.trimmed().split(" ")[0];
         });
 
+        // Special case. 
+        // Sometimes, when importing from a paperwallet or such, the key is split by newlines, and might have 
+        // been pasted like that. So check to see if the whole thing is one big private key
+        if (Settings::getInstance()->isValidSaplingPrivateKey(keys->join(""))) {
+            auto multiline = keys;
+            keys = new QList<QString>();
+            keys->append(multiline->join(""));
+            delete multiline;
+        }
+
         // Start the import. The function takes ownership of keys
         QTimer::singleShot(1, [=]() {doImport(keys);});
 

src/settings.cpp

@@ -328,6 +328,16 @@ QString Settings::getZboardAddr() {
     }
 }
 
+bool Settings::isValidSaplingPrivateKey(QString pk) {
+    if (isTestnet()) {
+        QRegExp zspkey("^secret-extended-key-test[0-9a-z]{278}$", Qt::CaseInsensitive);
+        return zspkey.exactMatch(pk);
+    } else {
+        QRegExp zspkey("^secret-extended-key-main[0-9a-z]{278}$", Qt::CaseInsensitive);
+        return zspkey.exactMatch(pk);
+    }
+}
+
 bool Settings::isValidAddress(QString addr) {
     QRegExp zcexp("^z[a-z0-9]{94}$",  Qt::CaseInsensitive);
     QRegExp zsexp("^z[a-z0-9]{77}$",  Qt::CaseInsensitive);

src/settings.h

@@ -37,6 +37,8 @@ public:
     bool    isSaplingAddress(QString addr);
     bool    isSproutAddress(QString addr);
             
+    bool    isValidSaplingPrivateKey(QString pk);
+
     bool    isSyncing();
     void    setSyncing(bool syncing);