Groups: add support for custom attributes

src/main/java/org/gitlab4j/api/GroupApi.java

@@ -3,6 +3,7 @@
 import java.io.File;
 import java.util.Date;
 import java.util.List;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.stream.Stream;
 
@@ -15,6 +16,7 @@
 import org.gitlab4j.api.models.AccessRequest;
 import org.gitlab4j.api.models.AuditEvent;
 import org.gitlab4j.api.models.Badge;
+import org.gitlab4j.api.models.CustomAttribute;
 import org.gitlab4j.api.models.Group;
 import org.gitlab4j.api.models.GroupFilter;
 import org.gitlab4j.api.models.GroupParams;
@@ -1725,4 +1727,123 @@ public void unshareGroup(Object groupIdOrPath, Integer sharedWithGroupId) throws
 	delete(Response.Status.NO_CONTENT, null,
 	        "groups", getGroupIdOrPath(groupIdOrPath), "share", sharedWithGroupId);
     }
+
+    /**
+     * Get all custom attributes for the specified group.
+     *
+     * <pre><code>GitLab Endpoint: GET /groups/:id/custom_attributes</code></pre>
+     *
+     * @param groupIdOrPath the group in the form of an Integer(ID), String(path), or Group instance
+     * @return a list of group's CustomAttributes
+     * @throws GitLabApiException if any exception occurs
+     */
+    public List<CustomAttribute> getCustomAttributes(final Object groupIdOrPath) throws GitLabApiException {
+        return (getCustomAttributes(groupIdOrPath, getDefaultPerPage()).all());
+    }
+
+    /**
+     * Get a Pager of custom attributes for the specified group.
+     *
+     * <pre><code>GitLab Endpoint: GET /groups/:id/custom_attributes</code></pre>
+     *
+     * @param groupIdOrPath the group in the form of an Integer(ID), String(path), or Group instance
+     * @param itemsPerPage the number of items per page
+     * @return a Pager of group's custom attributes
+     * @throws GitLabApiException if any exception occurs
+     */
+    public Pager<CustomAttribute> getCustomAttributes(final Object groupIdOrPath, int itemsPerPage) throws GitLabApiException {
+        return (new Pager<CustomAttribute>(this, CustomAttribute.class, itemsPerPage, null,
+            "groups", getGroupIdOrPath(groupIdOrPath), "custom_attributes"));
+    }
+
+    /**
+     * Get a Stream of all custom attributes for the specified group.
+     *
+     * <pre><code>GitLab Endpoint: GET /groups/:id/custom_attributes</code></pre>
+     *
+     * @param groupIdOrPath the group in the form of an Integer(ID), String(path), or Group instance
+     * @return a Stream of group's custom attributes
+     * @throws GitLabApiException if any exception occurs
+     */
+    public Stream<CustomAttribute> getCustomAttributesStream(final Object groupIdOrPath) throws GitLabApiException {
+        return (getCustomAttributes(groupIdOrPath, getDefaultPerPage()).stream());
+    }
+
+    /**
+     * Get a single custom attribute for the specified group.
+     *
+     * <pre><code>GitLab Endpoint: GET /groups/:id/custom_attributes/:key</code></pre>
+     *
+     * @param groupIdOrPath the group in the form of an Integer(ID), String(path), or Group instance
+     * @param key the key for the custom attribute
+     * @return a CustomAttribute instance for the specified key
+     * @throws GitLabApiException if any exception occurs
+     */
+    public CustomAttribute getCustomAttribute(final Object groupIdOrPath, final String key) throws GitLabApiException {
+        Response response = get(Response.Status.OK, null,
+            "groups", getGroupIdOrPath(groupIdOrPath), "custom_attributes", key);
+        return (response.readEntity(CustomAttribute.class));
+    }
+
+    /**
+     * Get an Optional instance with the value for a single custom attribute for the specified group.
+     *
+     * <pre><code>GitLab Endpoint: GET /groups/:id/custom_attributes/:key</code></pre>
+     *
+     * @param groupIdOrPath the group in the form of an Integer(ID), String(path), or Group instance, required
+     * @param key the key for the custom attribute, required
+     * @return an Optional instance with the value for a single custom attribute for the specified group
+     */
+    public Optional<CustomAttribute> geOptionalCustomAttribute(final Object groupIdOrPath, final String key) {
+        try {
+            return (Optional.ofNullable(getCustomAttribute(groupIdOrPath, key)));
+        } catch (GitLabApiException glae) {
+            return (GitLabApi.createOptionalFromException(glae));
+        }
+    }
+
+    /**
+     * Set a custom attribute for the specified group. The attribute will be updated if it already exists,
+     * or newly created otherwise.
+     *
+     * <pre><code>GitLab Endpoint: PUT /groups/:id/custom_attributes/:key</code></pre>
+     *
+     * @param groupIdOrPath the group in the form of an Integer(ID), String(path), or Group instance
+     * @param key the key for the custom attribute
+     * @param value the value for the customAttribute
+     * @return a CustomAttribute instance for the updated or created custom attribute
+     * @throws GitLabApiException if any exception occurs
+     */
+    public CustomAttribute setCustomAttribute(final Object groupIdOrPath, final String key, final String value) throws GitLabApiException {
+
+        if (Objects.isNull(key) || key.trim().isEmpty()) {
+            throw new IllegalArgumentException("Key cannot be null or empty");
+        }
+        if (Objects.isNull(value) || value.trim().isEmpty()) {
+            throw new IllegalArgumentException("Value cannot be null or empty");
+        }
+
+        GitLabApiForm formData = new GitLabApiForm().withParam("value", value);
+        Response response = putWithFormData(Response.Status.OK, formData,
+            "groups", getGroupIdOrPath(groupIdOrPath), "custom_attributes", key);
+        return (response.readEntity(CustomAttribute.class));
+    }
+
+    /**
+     * Delete a custom attribute for the specified group.
+     *
+     * <pre><code>GitLab Endpoint: DELETE /groups/:id/custom_attributes/:key</code></pre>
+     *
+     * @param groupIdOrPath the group in the form of an Integer(ID), String(path), or Group instance
+     * @param key the key of the custom attribute to delete
+     * @throws GitLabApiException if any exception occurs
+     */
+    public void deleteCustomAttribute(final Object groupIdOrPath, final String key) throws GitLabApiException {
+
+        if (Objects.isNull(key) || key.trim().isEmpty()) {
+            throw new IllegalArgumentException("Key can't be null or empty");
+        }
+
+        delete(Response.Status.OK, null, "groups", getGroupIdOrPath(groupIdOrPath), "custom_attributes", key);
+    }
 }

src/test/java/org/gitlab4j/api/AbstractIntegrationTest.java

@@ -5,6 +5,7 @@
 import java.util.WeakHashMap;
 
 import org.gitlab4j.api.GitLabApi.ApiVersion;
+import org.gitlab4j.api.models.Group;
 import org.gitlab4j.api.models.Project;
 import org.gitlab4j.api.models.User;
 
@@ -16,6 +17,7 @@
  * TEST_PRIVATE_TOKEN
  * TEST_NAMESPACE
  * TEST_PROJECT_NAME
+ * TEST_GROUP
  */
 public class AbstractIntegrationTest implements PropertyConstants {
 
@@ -33,6 +35,7 @@ public class AbstractIntegrationTest implements PropertyConstants {
     protected static class BaseTestResources {
         protected GitLabApi gitLabApi;
         protected Project testProject;
+        protected Group testGroup;
 
         protected BaseTestResources(GitLabApi gitLabApi) {
             this.gitLabApi = gitLabApi;
@@ -80,6 +83,10 @@ protected static GitLabApi baseTestSetup() {
             problems += "TEST_PROJECT_NAME cannot be empty\n";
         }
 
+        if (TEST_GROUP == null || TEST_GROUP.trim().isEmpty()) {
+            problems += "TEST_GROUP cannot be empty\n";
+        }
+
         if (problems.isEmpty()) {
             try {
                 GitLabApi gitLabApi = new GitLabApi(ApiVersion.V4, TEST_HOST_URL, TEST_PRIVATE_TOKEN);
@@ -123,6 +130,34 @@ protected static Project getTestProject() {
         }
     }
 
+    /**
+     * Get the test Group instance for the calling test class.
+     *
+     * @return the test Group instance for the calling test class
+     */
+    protected static Group getTestGroup() {
+
+        Throwable t = new Throwable();
+        StackTraceElement directCaller = t.getStackTrace()[1];
+        String callingClassName = directCaller.getClassName();
+        BaseTestResources baseResources = baseTestResourcesMap.get(callingClassName);
+        if (baseResources == null || baseResources.gitLabApi == null) {
+            System.err.println("Problems fetching test Project instance: GitLabApi instance is null");
+            return (null);
+        } else if (baseResources.testGroup != null) {
+            return (baseResources.testGroup);
+        }
+
+        try {
+            Group testGroup =  (baseResources.gitLabApi.getGroupApi().getGroup(TEST_GROUP));
+            baseResources.testGroup = testGroup;
+            return (testGroup);
+        } catch (Exception e) {
+            System.err.println("Problems fetching test Project instance: " + e.getMessage());
+            return (null);
+        }
+    }
+
     /**
      * Get the current user (the testing user).
      *