Add memo field in UI

src/qt/forms/sendcoinsentry.ui

@@ -221,7 +221,7 @@
       </item>
      </layout>
     </item>
-    <item row="4" column="0">
+    <item row="6" column="0">
      <widget class="QLabel" name="messageLabel">
       <property name="text">
        <string>Message:</string>
@@ -231,15 +231,54 @@
       </property>
      </widget>
     </item>
-    <item row="4" column="1">
-     <widget class="QLabel" name="messageTextLabel">
+    <item row="6" column="1">
+    <widget class="QLineEdit" name="messageTextLabel">
       <property name="toolTip">
-       <string>A message that was attached to the firo: URI which will be stored with the transaction for your reference. Note: This message will not be sent over the Firo network.</string>
+      <string>Optional message for this transaction</string>
       </property>
-      <property name="textFormat">
-       <enum>Qt::PlainText</enum>
+    </widget>
+    </item>
+   <item row="7" column="1">
+     <layout class="QHBoxLayout" name="horizontalLayoutWarning" stretch="0,1">
+      <property name="spacing">
+       <number>0</number>
       </property>
-     </widget>
+      <item>
+       <widget class="QLabel" name="iconMessageWarning">
+        <property name="toolTip">
+         <string></string>
+        </property>
+        <property name="text">
+         <string></string>
+        </property>
+        <property name="minimumWidth">
+          5
+        </property>
+        <property name="minimumHeight">
+          5
+        </property>
+        <property name="fixedWidth">
+          10
+        </property>
+        <property name="fixedHeight">
+          10
+        </property>
+        <property name="styleSheet">
+          <string>margin-left:-30px;margin-right:-10px;margin-top:2px;</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+        <widget class="QLabel" name="messageWarning">
+          <property name="text">
+          <string></string>
+          </property>
+          <property name="styleSheet">
+            <string>color: #FFA800; margin-left:-10px;</string>
+          </property>
+        </widget>
+      </item>
+     </layout>
     </item>
     <item row="5" column="0" colspan="2">
      <widget class="Line" name="line">

src/qt/sendcoinsdialog.cpp

@@ -265,6 +265,7 @@ void SendCoinsDialog::on_sendButton_clicked()
                     }
                     ctx = dialog->getUnlockContext();
                 }
+                recipient.message = entry->getValue().message;
                 recipients.append(recipient);
             }
             else
@@ -532,6 +533,18 @@ void SendCoinsDialog::on_sendButton_clicked()
     QString questionString = tr("Are you sure you want to send?");
     questionString.append(warningMessage);
     questionString.append("<br /><br />%1");
+    bool firstMessage = true;
+    for (const auto& rec : recipients) {
+        if (!rec.message.isEmpty()) {
+            if (firstMessage) {
+                questionString.append("<hr><b>" + tr("Messages") + ":</b><br>");
+                firstMessage = false;
+            }
+            QString sanitizedMsg = GUIUtil::HtmlEscape(rec.message, true);
+            questionString.append("• " + sanitizedMsg + "<br>");
+        }
+    }
+
     double txSize;
     if ((fAnonymousMode == false) && (recipients.size() == sparkAddressCount) && spark::IsSparkAllowed()) 
     {

src/qt/sendcoinsentry.cpp

@@ -11,6 +11,7 @@
 #include "optionsmodel.h"
 #include "platformstyle.h"
 #include "walletmodel.h"
+#include "../spark/sparkwallet.h"
 #include "../wallet/wallet.h"
 
 #include <QApplication>
@@ -29,6 +30,7 @@ SendCoinsEntry::SendCoinsEntry(const PlatformStyle *_platformStyle, QWidget *par
     QIcon icon_;
     icon_.addFile(QString::fromUtf8(":/icons/ic_warning"), QSize(), QIcon::Normal, QIcon::On);
     ui->iconWarning->setPixmap(icon_.pixmap(18, 18));
+    ui->iconMessageWarning->setPixmap(icon_.pixmap(18, 18));
 
     ui->addressBookButton->setIcon(platformStyle->SingleColorIcon(":/icons/address-book"));
     ui->pasteButton->setIcon(platformStyle->SingleColorIcon(":/icons/editpaste"));
@@ -55,13 +57,43 @@ SendCoinsEntry::SendCoinsEntry(const PlatformStyle *_platformStyle, QWidget *par
     connect(ui->deleteButton, &QToolButton::clicked, this, &SendCoinsEntry::deleteClicked);
     connect(ui->deleteButton_is, &QToolButton::clicked, this, &SendCoinsEntry::deleteClicked);
     connect(ui->deleteButton_s, &QToolButton::clicked, this, &SendCoinsEntry::deleteClicked);
+    connect(ui->messageTextLabel, &QLineEdit::textChanged, this, &SendCoinsEntry::on_MemoTextChanged);
+
+    ui->messageLabel->setVisible(false);
+    ui->messageTextLabel->setVisible(false);
+    ui->iconMessageWarning->setVisible(false);
 }
 
 SendCoinsEntry::~SendCoinsEntry()
 {
     delete ui;
 }
 
+void SendCoinsEntry::on_MemoTextChanged(const QString &text)
+{
+    const spark::Params* params = spark::Params::get_default();
+    int maxLength = params->get_memo_bytes();
+    bool isOverLimit = text.length() > maxLength;
+
+    if (isOverLimit) {
+        ui->messageWarning->setText(QString("Message exceeds %1 bytes limit").arg(maxLength));
+        ui->messageWarning->setVisible(true);
+        ui->messageTextLabel->setStyleSheet("border: 1px solid red;");
+        ui->iconMessageWarning->setVisible(true);
+    } else {
+        QString sanitized = text;
+        sanitized.remove(QRegExp("[\\x00-\\x1F\\x7F]"));
+        if (sanitized != text) {
+            ui->messageTextLabel->setText(sanitized);
+            return;
+        }
+        ui->messageWarning->clear();
+        ui->messageWarning->setVisible(false);
+        ui->messageTextLabel->setStyleSheet("");
+        ui->iconMessageWarning->setVisible(false);
+    }
+}
+
 void SendCoinsEntry::on_pasteButton_clicked()
 {
     // Paste text from clipboard into recipient field
@@ -85,6 +117,13 @@ void SendCoinsEntry::on_payTo_textChanged(const QString &address)
 {
     updateLabel(address);
     setWarning(fAnonymousMode);
+
+    bool isSparkAddress = false;
+    if (model) {
+        isSparkAddress = model->validateSparkAddress(address);
+    }
+    ui->messageLabel->setVisible(isSparkAddress);
+    ui->messageTextLabel->setVisible(isSparkAddress);
 }
 
 void SendCoinsEntry::setModel(WalletModel *_model)

src/qt/sendcoinsentry.h

@@ -63,6 +63,7 @@ public Q_SLOTS:
 private Q_SLOTS:
     void deleteClicked();
     void on_payTo_textChanged(const QString &address);
+    void on_MemoTextChanged(const QString &text);
     void on_addressBookButton_clicked();
     void on_pasteButton_clicked();
     void updateDisplayUnit();

src/qt/transactiondesc.cpp

@@ -311,10 +311,44 @@ QString TransactionDesc::toHTML(CWallet *wallet, CWalletTx &wtx, TransactionReco
     strHTML += "<b>" + tr("Transaction total size") + ":</b> " + QString::number(wtx.tx->GetTotalSize()) + " bytes<br>";
     strHTML += "<b>" + tr("Output index") + ":</b> " + QString::number(rec->getOutputIndex()) + "<br>";
 
-    // Message from normal firo:URI (firo:123...?message=example)
-    for (const PAIRTYPE(std::string, std::string)& r : wtx.vOrderForm)
-        if (r.first == "Message")
-            strHTML += "<br><b>" + tr("Message") + ":</b><br>" + GUIUtil::HtmlEscape(r.second, true) + "<br>";
+    isminetype fAllFromMe = ISMINE_SPENDABLE;
+    bool foundSparkOutput = false;
+
+    for (const CTxIn& txin : wtx.tx->vin) {
+        isminetype mine = wallet->IsMine(txin, *wtx.tx);
+        fAllFromMe = std::min(fAllFromMe, mine);
+    }
+
+    bool firstMessage = true;
+    if (fAllFromMe) {
+        for (const CTxOut& txout : wtx.tx->vout) {
+            if (wtx.IsChange(txout)) continue;
+
+            CSparkOutputTx sparkOutput;
+            if (wallet->GetSparkOutputTx(txout.scriptPubKey, sparkOutput)) {
+                if (!sparkOutput.memo.empty()) {
+                    foundSparkOutput = true;
+                    if (firstMessage) {
+                        strHTML += "<hr><b>" + tr("Messages") + ":</b><br>";
+                        firstMessage = false;
+                    }
+                    strHTML += "• " + GUIUtil::HtmlEscape(sparkOutput.memo, true) + "<br>";
+                }
+            }
+        }
+    }
+
+    if (!foundSparkOutput && wallet->sparkWallet) {
+        for (const auto& [id, meta] : wallet->sparkWallet->getMintMap()) {
+            if (meta.txid == rec->hash && !meta.memo.empty()) {
+                if (firstMessage) {
+                    strHTML += "<hr><b>" + tr("Messages") + ":</b><br>";
+                    firstMessage = false;
+                }
+                strHTML += "• " + GUIUtil::HtmlEscape(meta.memo, true) + "<br>";
+            }
+        }
+    }
 
     if (wtx.IsCoinBase())
     {

src/qt/walletmodel.cpp

@@ -1384,7 +1384,7 @@ WalletModel::SendCoinsReturn WalletModel::prepareMintSparkTransaction(std::vecto
             address.decode(rcp.address.toStdString());
             spark::MintedCoinData data;
             data.address = address;
-            data.memo = "";
+            data.memo = rcp.message.toStdString();
             data.v = rcp.amount;
             outputs.push_back(data);
             total += rcp.amount;
@@ -1481,7 +1481,7 @@ WalletModel::SendCoinsReturn WalletModel::prepareSpendSparkTransaction(WalletMod
                 address.decode(rcp.address.toStdString());
                 spark::OutputCoinData data;
                 data.address = address;
-                data.memo = "";
+                data.memo = rcp.message.toStdString();
                 data.v = rcp.amount;
                 privateRecipients.push_back(std::make_pair(data, rcp.fSubtractFeeFromAmount));
             } else {

src/spark/primitives.h

@@ -87,6 +87,7 @@ class CSparkOutputTx
 {
 public:
     std::string address;
+    std::string memo;
     int64_t amount;
 
     CSparkOutputTx()
@@ -97,6 +98,7 @@ class CSparkOutputTx
     void SetNull()
     {
         address = "";
+        memo = "";
         amount = 0;
     }
 
@@ -105,6 +107,15 @@ class CSparkOutputTx
     inline void SerializationOp(Stream& s, Operation ser_action) {
         READWRITE(address);
         READWRITE(amount);
+        if (ser_action.ForRead()) {
+            if (!s.empty()) {
+                READWRITE(memo);
+            } else {
+                memo = "";
+            }
+        } else {
+            READWRITE(memo);
+        }
     }
 };
 

src/spark/sparkwallet.cpp

@@ -742,7 +742,12 @@ std::vector<CRecipient> CSparkWallet::CreateSparkMintRecipients(
         script.insert(script.end(), serializedCoins[i].begin(), serializedCoins[i].end());
         unsigned char network = spark::GetNetworkType();
         std::string addr = outputs[i].address.encode(network);
-        CRecipient recipient = {script, CAmount(outputs[i].v), false, addr};
+        std::string memo = outputs[i].memo;
+        const std::size_t max_memo_size = outputs[i].address.get_params()->get_memo_bytes();
+        if (memo.length() > max_memo_size) {
+            throw std::runtime_error(strprintf("Memo exceeds maximum length of %d bytes", max_memo_size));
+        }
+        CRecipient recipient = {script, CAmount(outputs[i].v), false, addr, memo};
         results.emplace_back(recipient);
     }
 
@@ -1093,6 +1098,7 @@ bool CSparkWallet::CreateSparkMintTransactions(
                                     CSparkOutputTx output;
                                     output.address = recipient.address;
                                     output.amount = recipient.nAmount;
+                                    output.memo = recipient.memo;
                                     walletdb.WriteSparkOutputTx(recipient.scriptPubKey, output);
                                     break;
                                 }
@@ -1530,6 +1536,7 @@ CWalletTx CSparkWallet::CreateSparkSpendTransaction(
                 CSparkOutputTx output;
                 output.address =  privOutputs[i].address.encode(network);
                 output.amount = privOutputs[i].v;
+                output.memo = privOutputs[i].memo;
                 walletdb.WriteSparkOutputTx(script, output);
                 tx.vout.push_back(CTxOut(0, script));
                 i++;

src/wallet/wallet.h

@@ -190,6 +190,7 @@ struct CRecipient
     CAmount nAmount;
     bool fSubtractFeeFromAmount;
     std::string address;
+    std::string memo;
 };
 
 typedef std::map<std::string, std::string> mapValue_t;