Fix #4903: Parse Email Addresses whenever used (#4932)

servatrice/src/email_parser.cpp

@@ -0,0 +1,54 @@
+#include "email_parser.h"
+
+#include <QRegularExpression>
+#include <QString>
+
+QPair<QString, QString> EmailParser::parseEmailAddress(const QString &dirtyEmailAddress)
+{
+    // https://www.regular-expressions.info/email.html
+    static const QRegularExpression emailRegex(R"(^([A-Z0-9._%+-]+)@([A-Z0-9.-]+\.[A-Z]{2,})$)",
+                                               QRegularExpression::CaseInsensitiveOption);
+    const auto match = emailRegex.match(dirtyEmailAddress);
+
+    if (dirtyEmailAddress.isEmpty() || !match.hasMatch()) {
+        return {};
+    }
+
+    QString capturedEmailUser = match.captured(1);
+    QString capturedEmailAddressDomain = match.captured(2);
+
+    // Replace googlemail.com with gmail.com, as is standard nowadays
+    // https://www.gmass.co/blog/domains-gmail-com-googlemail-com-and-google-com/
+    if (capturedEmailAddressDomain.toLower() == "googlemail.com") {
+        capturedEmailAddressDomain = "gmail.com";
+    }
+
+    // Trim out dots and pluses from Google/Gmail domains
+    if (capturedEmailAddressDomain.toLower() == "gmail.com") {
+        // Remove all content after first plus sign (as unnecessary with gmail)
+        // https://gmail.googleblog.com/2008/03/2-hidden-ways-to-get-more-from-your.html
+        const auto firstPlusSign = capturedEmailUser.indexOf("+");
+        if (firstPlusSign != -1) {
+            capturedEmailUser = capturedEmailUser.left(firstPlusSign);
+        }
+
+        // Remove all periods (as unnecessary with gmail)
+        // https://gmail.googleblog.com/2008/03/2-hidden-ways-to-get-more-from-your.html
+        capturedEmailUser.replace(".", "");
+    }
+
+    return {capturedEmailUser, capturedEmailAddressDomain};
+}
+
+QString EmailParser::getParsedEmailAddress(const QString &dirtyEmailAddress)
+{
+    const auto parsedEmailAddress = EmailParser::parseEmailAddress(dirtyEmailAddress);
+    return EmailParser::getParsedEmailAddress(parsedEmailAddress);
+}
+
+QString EmailParser::getParsedEmailAddress(const QPair<QString, QString> &emailAddressIntermediate)
+{
+    const auto emailUser = emailAddressIntermediate.first;
+    const auto emailDomain = emailAddressIntermediate.second;
+    return emailUser + "@" + emailDomain;
+}