Censor domain authcode by default in tools (#3170)

When inspecting domain entities with tools like GetDomainCommand, displaying
plaintext authentication codes is unnecessary and presents a security risk
for credential exposure in logs and bug ticket comments (b/537293980).

This commit modifies GetDomainCommand to redact sensitive authcodes by
default using an in-memory entity builder snapshot while preserving database
records. An optional --show_authcode flag with arity 1 is introduced to
explicitly display authcodes when required for transfer authorization.

BUG= http://b/537293980

core/src/main/java/google/registry/tools/GetDomainCommand.java

@@ -20,6 +20,8 @@ import com.beust.jcommander.Parameter;
 import com.beust.jcommander.Parameters;
 import google.registry.model.ForeignKeyUtils;
 import google.registry.model.domain.Domain;
+import google.registry.model.domain.DomainAuthInfo;
+import google.registry.model.eppcommon.AuthInfo.PasswordAuth;
 import google.registry.persistence.transaction.QueryComposer.Comparator;
 import google.registry.util.DomainNameUtils;
 import java.util.List;
@@ -32,6 +34,12 @@ final class GetDomainCommand extends GetEppResourceCommand {
   @Parameter(names = "--show_deleted", description = "Include deleted domains in the print out")
   private boolean showDeleted = false;
 
+  @Parameter(
+      names = "--show_authcode",
+      description = "Include domain authentication code in output",
+      arity = 1)
+  private boolean showAuthcode = false;
+
   @Parameter(
       description = "Fully qualified domain name(s)",
       required = true)
@@ -51,14 +59,26 @@ final class GetDomainCommand extends GetEppResourceCommand {
                         .stream()
                         .forEach(
                             d -> {
-                              printResource("Domain", canonicalDomain, Optional.of(d));
+                              printResource(
+                                  "Domain", canonicalDomain, Optional.of(censorAuthcode(d)));
                             }));
       } else {
         printResource(
             "Domain",
             canonicalDomain,
-            ForeignKeyUtils.loadResource(Domain.class, canonicalDomain, readTimestamp));
+            ForeignKeyUtils.loadResource(Domain.class, canonicalDomain, readTimestamp)
+                .map(this::censorAuthcode));
       }
     }
   }
+
+  private Domain censorAuthcode(Domain domain) {
+    if (showAuthcode || domain.getAuthInfo() == null) {
+      return domain;
+    }
+    return domain
+        .asBuilder()
+        .setAuthInfo(DomainAuthInfo.create(PasswordAuth.create("[REDACTED]")))
+        .build();
+  }
 }

core/src/test/java/google/registry/tools/GetDomainCommandTest.java

@@ -24,6 +24,8 @@ import static google.registry.util.DateTimeUtils.plusMonths;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import com.beust.jcommander.ParameterException;
+import google.registry.model.domain.DomainAuthInfo;
+import google.registry.model.eppcommon.AuthInfo.PasswordAuth;
 import google.registry.testing.DatabaseHelper;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -136,4 +138,28 @@ class GetDomainCommandTest extends CommandTestCase<GetDomainCommand> {
     // Deleted
     assertInStdout("Websafe key: kind:Domain@sql:rO0ABXQABTMtVExE");
   }
+
+  @Test
+  void testSuccess_censorsAuthcodeByDefault() throws Exception {
+    persistResource(
+        DatabaseHelper.newDomain("example.tld")
+            .asBuilder()
+            .setAuthInfo(DomainAuthInfo.create(PasswordAuth.create("secret123")))
+            .build());
+    runCommand("example.tld");
+    assertInStdout("value=[REDACTED]");
+    assertNotInStdout("secret123");
+  }
+
+  @Test
+  void testSuccess_showAuthcode() throws Exception {
+    persistResource(
+        DatabaseHelper.newDomain("example.tld")
+            .asBuilder()
+            .setAuthInfo(DomainAuthInfo.create(PasswordAuth.create("secret123")))
+            .build());
+    runCommand("example.tld", "--show_authcode=true");
+    assertInStdout("value=secret123");
+    assertNotInStdout("[REDACTED]");
+  }
 }