resolve bug with empty strings and enhance the sent email's body

src/main/java/io/phasetwo/keycloak/magic/MagicLink.java

@@ -15,6 +15,7 @@
 import java.net.URI;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.OptionalInt;
 import java.util.function.Consumer;
 import java.util.stream.Collectors;
@@ -33,6 +34,7 @@
 import org.keycloak.models.AuthenticationFlowModel;
 import org.keycloak.models.ClientModel;
 import org.keycloak.models.Constants;
+import org.keycloak.models.KeycloakContext;
 import org.keycloak.models.KeycloakSession;
 import org.keycloak.models.KeycloakSessionFactory;
 import org.keycloak.models.KeycloakSessionTask;
@@ -255,15 +257,14 @@ public static boolean sendMagicLinkEmail(KeycloakSession session, UserModel user
     try {
       EmailTemplateProvider emailTemplateProvider =
           session.getProvider(EmailTemplateProvider.class);
-      String realmName = getRealmName(realm);
-      List<Object> subjAttr = ImmutableList.of(realmName);
+      String loginSubjectName = getLoginSubjectName(session.getContext());
+      List<Object> subjAttr = ImmutableList.of(loginSubjectName);
       Map<String, Object> bodyAttr = Maps.newHashMap();
-      bodyAttr.put("realmName", realmName);
+      bodyAttr.put("loginSubjectName", loginSubjectName);
       bodyAttr.put("magicLink", link);
       emailTemplateProvider
           .setRealm(realm)
           .setUser(user)
-          .setAttribute("realmName", realmName)
           .send("magicLinkSubject", subjAttr, "magic-link-email.ftl", bodyAttr);
       return true;
     } catch (EmailException e) {
@@ -278,7 +279,7 @@ public static boolean sendMagicLinkContinuationEmail(
     try {
       EmailTemplateProvider emailTemplateProvider =
           session.getProvider(EmailTemplateProvider.class);
-      String realmName = getRealmName(realm);
+      String realmName = getLoginSubjectName(session.getContext());
       List<Object> subjAttr = ImmutableList.of(realmName);
       Map<String, Object> bodyAttr = Maps.newHashMap();
       bodyAttr.put("realmName", realmName);
@@ -304,7 +305,7 @@ public static boolean sendOtpEmail(KeycloakSession session, UserModel user, Stri
     try {
       EmailTemplateProvider emailTemplateProvider =
           session.getProvider(EmailTemplateProvider.class);
-      String realmName = getRealmName(realm);
+      String realmName = getLoginSubjectName(session.getContext());
       List<Object> subjAttr = ImmutableList.of(realmName);
       Map<String, Object> bodyAttr = Maps.newHashMap();
       bodyAttr.put("code", code);
@@ -320,8 +321,14 @@ public static boolean sendOtpEmail(KeycloakSession session, UserModel user, Stri
     return false;
   }
 
-  public static String getRealmName(RealmModel realm) {
-    return Strings.isNullOrEmpty(realm.getDisplayName()) ? realm.getName() : realm.getDisplayName();
+  public static String getLoginSubjectName(KeycloakContext context) {
+    return Optional
+            .ofNullable(context.getClient())
+            .map(ClientModel::getName)
+            .orElseGet(() -> {
+              final var realm = context.getRealm();
+              return Strings.isNullOrEmpty(realm.getDisplayName()) ? realm.getName() : realm.getDisplayName();
+            });
   }
 
   public static final String MAGIC_LINK_AUTH_FLOW_ALIAS = "magic link";

src/main/resources/theme-resources/templates/html/magic-link-continuation-email.ftl

@@ -1,4 +1,4 @@
 <#import "template.ftl" as layout>
 <@layout.emailLayout>
-${kcSanitize(msg("magicLinkContinuationBodyHtml", realmName, magicLink))?no_esc}
+${kcSanitize(msg("magicLinkContinuationBodyHtml", loginSubjectName, magicLink))?no_esc}
 </@layout.emailLayout>

src/main/resources/theme-resources/templates/html/magic-link-email.ftl

@@ -1,4 +1,4 @@
 <#import "template.ftl" as layout>
 <@layout.emailLayout>
-${kcSanitize(msg("magicLinkBodyHtml", realmName, magicLink))?no_esc}
+${kcSanitize(msg("magicLinkBodyHtml", loginSubjectName, magicLink))?no_esc}
 </@layout.emailLayout>

src/main/resources/theme-resources/templates/html/otp-email.ftl

@@ -1,4 +1,4 @@
 <#import "template.ftl" as layout>
 <@layout.emailLayout>
-${kcSanitize(msg("otpBodyHtml", realmName, code))?no_esc}
+${kcSanitize(msg("otpBodyHtml", loginSubjectName, code))?no_esc}
 </@layout.emailLayout>

src/main/resources/theme-resources/templates/text/magic-link-continuation-email.ftl

@@ -1,2 +1,2 @@
 <#ftl output_format="plainText">
-${msg("magicLinkContinuationBody", realmName, magicLink)}
+${msg("magicLinkContinuationBody", loginSubjectName, magicLink)}

src/main/resources/theme-resources/templates/text/magic-link-email.ftl

@@ -1,2 +1,2 @@
 <#ftl output_format="plainText">
-${msg("magicLinkBody", realmName, magicLink)}
+${msg("magicLinkBody", loginSubjectName, magicLink)}

src/main/resources/theme-resources/templates/text/otp-email.ftl

@@ -1,2 +1,2 @@
 <#ftl output_format="plainText">
-${msg("otpBody", realmName, code)}
+${msg("otpBody", loginSubjectName, code)}