Refactor InternalUsers REST API test

src/integrationTest/java/org/opensearch/security/api/AbstractApiIntegrationTest.java

@@ -373,4 +373,37 @@ void assertResponseBody(final String responseBody) {
         assertThat(responseBody, not(equalTo("")));
     }
 
+    static ToXContentObject configJsonArray(final String... values) {
+        return (builder, params) -> {
+            builder.startArray();
+            if (values != null) {
+                for (final var v : values) {
+                    if (v == null) {
+                        builder.nullValue();
+                    } else {
+                        builder.value(v);
+                    }
+                }
+            }
+            return builder.endArray();
+        };
+    }
+
+    static String[] generateArrayValues(boolean useNulls) {
+        final var length = randomIntBetween(1, 5);
+        final var values = new String[length];
+        final var nullIndex = randomIntBetween(0, length - 1);
+        for (var i = 0; i < values.length; i++) {
+            if (useNulls && i == nullIndex) values[i] = null;
+            else values[i] = randomAsciiAlphanumOfLength(10);
+        }
+        return values;
+    }
+
+    static ToXContentObject randomConfigArray(final boolean useNulls) {
+        return useNulls
+            ? configJsonArray(generateArrayValues(useNulls))
+            : randomFrom(List.of(configJsonArray(generateArrayValues(false)), configJsonArray()));
+    }
+
 }

src/integrationTest/java/org/opensearch/security/api/AbstractConfigEntityApiIntegrationTest.java

@@ -82,33 +82,6 @@ public AbstractConfigEntityApiIntegrationTest(final String path, final TestDescr
         this.testDescriptor = testDescriptor;
     }
 
-    static ToXContentObject configJsonArray(final String... values) {
-        return (builder, params) -> {
-            builder.startArray();
-            if (values != null) {
-                for (final var v : values) {
-                    if (v == null) {
-                        builder.nullValue();
-                    } else {
-                        builder.value(v);
-                    }
-                }
-            }
-            return builder.endArray();
-        };
-    }
-
-    static String[] generateArrayValues(boolean useNulls) {
-        final var length = randomIntBetween(1, 5);
-        final var values = new String[length];
-        final var nullIndex = randomIntBetween(0, length - 1);
-        for (var i = 0; i < values.length; i++) {
-            if (useNulls && i == nullIndex) values[i] = null;
-            else values[i] = randomAsciiAlphanumOfLength(10);
-        }
-        return values;
-    }
-
     @Override
     protected String apiPath(String... paths) {
         final StringJoiner fullPath = new StringJoiner("/").add(super.apiPath(path));

src/integrationTest/java/org/opensearch/security/api/InternalUsersRegExpPasswordRulesRestApiIntegrationTest.java

@@ -0,0 +1,96 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+package org.opensearch.security.api;
+
+import java.util.StringJoiner;
+
+import org.junit.Test;
+
+import org.opensearch.core.xcontent.ToXContentObject;
+import org.opensearch.security.dlic.rest.validation.PasswordValidator;
+import org.opensearch.security.dlic.rest.validation.RequestContentValidator;
+import org.opensearch.security.support.ConfigConstants;
+
+import static org.opensearch.security.api.PatchPayloadHelper.addOp;
+import static org.opensearch.security.api.PatchPayloadHelper.patch;
+
+public class InternalUsersRegExpPasswordRulesRestApiIntegrationTest extends AbstractApiIntegrationTest {
+
+    final static String PASSWORD_VALIDATION_ERROR_MESSAGE = "xxxxxxxx";
+
+    static {
+        clusterSettings.put(ConfigConstants.SECURITY_RESTAPI_PASSWORD_VALIDATION_ERROR_MESSAGE, PASSWORD_VALIDATION_ERROR_MESSAGE)
+            .put(ConfigConstants.SECURITY_RESTAPI_PASSWORD_VALIDATION_REGEX, "(?=.*[A-Z])(?=.*[^a-zA-Z\\\\d])(?=.*[0-9])(?=.*[a-z]).{8,}")
+            .put(ConfigConstants.SECURITY_RESTAPI_PASSWORD_SCORE_BASED_VALIDATION_STRENGTH, PasswordValidator.ScoreStrength.FAIR.name());
+    }
+
+    String internalUsers(String... path) {
+        final var fullPath = new StringJoiner("/").add(super.apiPath("internalusers"));
+        if (path != null) {
+            for (final var p : path)
+                fullPath.add(p);
+        }
+        return fullPath.toString();
+    }
+
+    ToXContentObject internalUserWithPassword(final String password) {
+        return (builder, params) -> builder.startObject()
+            .field("password", password)
+            .field("backend_roles", randomConfigArray(false))
+            .endObject();
+    }
+
+    @Test
+    public void canNotCreateUsersWithPassword() throws Exception {
+        withUser(ADMIN_USER_NAME, client -> {
+            // validate short passwords
+            badRequest(() -> client.putJson(internalUsers("tooshoort"), internalUserWithPassword("")));
+            badRequest(() -> client.putJson(internalUsers("tooshoort"), internalUserWithPassword("123")));
+            badRequest(() -> client.putJson(internalUsers("tooshoort"), internalUserWithPassword("1234567")));
+            badRequest(() -> client.putJson(internalUsers("tooshoort"), internalUserWithPassword("1Aa%")));
+            badRequest(() -> client.putJson(internalUsers("tooshoort"), internalUserWithPassword("123456789")));
+            badRequest(() -> client.putJson(internalUsers("tooshoort"), internalUserWithPassword("a123456789")));
+            badRequest(() -> client.putJson(internalUsers("tooshoort"), internalUserWithPassword("A123456789")));
+            // validate that password same as user
+            badRequest(() -> client.putJson(internalUsers("$1aAAAAAAAAC"), internalUserWithPassword("$1aAAAAAAAAC")));
+            badRequest(() -> client.putJson(internalUsers("$1aAAAAAAAac"), internalUserWithPassword("$1aAAAAAAAAC")));
+            badRequestWithReason(
+                () -> client.patch(
+                    internalUsers(),
+                    patch(
+                        addOp("testuser1", internalUserWithPassword("$aA123456789")),
+                        addOp("testuser2", internalUserWithPassword("testpassword2"))
+                    )
+                ),
+                PASSWORD_VALIDATION_ERROR_MESSAGE
+            );
+            // validate similarity
+            badRequestWithReason(
+                () -> client.putJson(internalUsers("some_user_name"), internalUserWithPassword("H3235,cc,some_User_Name")),
+                RequestContentValidator.ValidationError.SIMILAR_PASSWORD.message()
+            );
+        });
+    }
+
+    @Test
+    public void canCreateUsersWithPassword() throws Exception {
+        withUser(ADMIN_USER_NAME, client -> {
+            created(() -> client.putJson(internalUsers("ok1"), internalUserWithPassword("$aA123456789")));
+            created(() -> client.putJson(internalUsers("ok2"), internalUserWithPassword("$Aa123456789")));
+            created(() -> client.putJson(internalUsers("ok3"), internalUserWithPassword("$1aAAAAAAAAA")));
+            ok(() -> client.putJson(internalUsers("ok3"), internalUserWithPassword("$1aAAAAAAAAC")));
+            ok(() -> client.patch(internalUsers(), patch(addOp("ok3", internalUserWithPassword("$1aAAAAAAAAB")))));
+            ok(() -> client.putJson(internalUsers("ok1"), internalUserWithPassword("Admin_123")));
+        });
+    }
+
+}