Wiki API Basics

Liferay’s Headless Delivery application provides REST services for the Wiki application. With these services, you can add Wiki nodes and pages, list their information, modify their content, or remove them altogether. Here you’ll call those services using cURL commands and Java classes.

Preparing Tutorial Resources

Before proceeding with the tutorial, first set up a clean Liferay Docker container and prepare the provided tutorial code for use.

Liferay Docker Container

Start a new Liferay instance by running

docker run -it -m 8g -p 8080:8080 liferay/portal:7.4.3.120-ga120

Sign in to Liferay at http://localhost:8080. Use the email address [e-mail] and the password test. When prompted, change the password to learn.

Once started, retrieve the Site ID. To find your Site ID, open the Site Menu (), and go to Configuration → Site Settings → Site Configuration.

Tutorial Code

This tutorial provides sample code to demonstrate the Headless API. This code includes both sample cURL and Java files for use throughout the tutorial.

Run the following command to download and unzip the sample code:

curl https://resources.learn.liferay.com/dxp/latest/en/collaboration-and-social/wiki/developer-guide/liferay-q8u2.zip -O

unzip liferay-q8u2.zip

While the cURL scripts come ready for use, you must manually compile the Java source files before you can run them. To do this, go to the project’s java folder, and run the javac command.

cd liferay-q8u2/java

javac -classpath .:* *.java

Note that the project includes the com.liferay.headless.delivery.client.jar file as a dependency. You can find client JAR dependency information for all REST applications in the API explorer in your installation at /o/api.

The provided code includes APIs for the WikiNode and WikiPage services. See Tutorial Code Reference for a list of all included sample APIs.

important

The provided code uses basic authentication for demonstration purposes. For production, you should authorize users with OAuth2.

Calling the Sample WikiNode APIs

In this exercise, you can use either the cURL commands or Java classes to call the WikiNode APIs. The following output examples correspond to the cURL commands, which slightly differ from the output for the provided Java classes.

1. Navigate to the curl or java folder in the liferay-q8u2 project.

   For cURL:

   cd liferay-q8u2/curl
   

   For Java:

   cd liferay-q8u2/java
   

2. Execute WikiNode_POST_ToSite using your Site ID as a parameter. This creates a new Wiki node in the specified Site.

   For cURL:

   ./WikiNode_POST_ToSite.sh {site-id}
   

   For Java:

   java -classpath .:* -DsiteId={site-id} WikiNode_POST_ToSite
   

   The terminal displays the complete schema for the newly created Wiki node. The provided API calls only define the description and name fields for the new node.

3. Copy the node’s ID for use with the following GET, PUT, and DELETE methods.

   {
     ...
     "description" : "Foo",
     ...
     "id" : 38405,
     "name" : "Able Node",
     ...
   }
   

4. Execute WikiNodes_GET_FromSite using the Site ID for its parameter. This returns a list of all Wiki nodes in the specified Site.

   For cURL:

   ./WikiNodes_GET_FromSite.sh {site-id}
   

   For Java:

   java -classpath .:* -DsiteId={site-id} WikiNodes_GET_FromSite
   

   note

   All DXP/Portal instances come with a default Wiki node called Main. This node is shown in the above output, along with any nodes you’ve created.

5. Execute WikiNode_PUT_ById using the Wiki node ID for its parameter. This replaces the details of the specified Wiki node with the details provided in the API call.

   For cURL:

   ./WikiNode_PUT_ById.sh {wiki-node-id}
   

   For Java:

   java -classpath .:* -DwikiNodeId={wiki-node-id} WikiNode_PUT_ById
   

   {
     ...
     "description" : "Bar",
     ...
     "id" : 38405,
     "name" : "Baker Node",
     ...
   }
   

6. Execute WikiNode_DELETE_ById using the same Wiki node ID for its parameter. This deletes the specified node.

   For cURL:

   ./WikiNode_DELETE_ById.sh {wiki-node-id}
   

   For Java:

   java -classpath .:* -DwikiNodeId={wiki-node-id} WikiNode_DELETE_ById
   

7. Execute WikiNode_GET_ById using the same Wiki node ID for its parameter. This returns the details for the specified node if it exists.

   For cURL:

   ./WikiNode_GET_ById.sh {wiki-node-id}
   

   For Java:

   java -classpath .:* -DwikiNodeId={wiki-node-id} WikiNode_GET_ById
   

   Since you deleted the node in the preceding step, it returns the following message.

   {
     "status" : "NOT_FOUND",
     "title" : "No WikiNode exists with the primary key 38405"
   }
   

Calling the Sample WikiPage APIs

You can use either the cURL commands or Java classes to call the WikiPage APIs. The following output examples correspond to the cURL commands, which differ slightly from the output for the provided Java classes.

1. Navigate to the curl or java folder in the liferay-q8u2 project.

   For cURL:

   cd liferay-q8u2/curl
   

   For Java:

   cd liferay-q8u2/java
   

2. Execute WikiNode_POST_ToSite to create a node for your Wiki page.

   For cURL:

   ./WikiNode_POST_ToSite.sh {site-id}
   

   For Java:

   java -classpath .:* -DsiteId={site-id} WikiNode_POST_ToSite
   

   note

   Since Wiki pages are stored in Wiki nodes, at least one node must exist before you can create any Wiki pages.

3. Copy the node’s ID from the output for use with the WikiPage_POST_ToNode call.

   {
     ...
     "description" : "Foo",
     ...
     "id" : 38504,
     "name" : "Able Node",
     ...
   }
   

4. Execute WikiPage_POST_ToNode using the above node ID for its parameter. This creates a new Wiki page for the specified node.

   For cURL:

   ./WikiPage_POST_ToNode.sh {wiki-node-id}
   

   For Java:

   java -classpath .:* -DwikiNodeId={wiki-node-id} WikiPage_POST_ToNode
   

5. Copy the page’s ID for use with the WikiPage_POST_ToParent call.

   {
     ...
     "content" : "Foo",
     ...
     "description" : "Able Page",
     "encodingFormat" : "text/x-wiki",
     ...
     "headline" : "Able Page",
     "id" : 38506,
     ...
   }
   

6. Execute WikiPage_POST_ToParent using the above Wiki page ID for its parameter. This creates a child page for the specified Wiki page.

   For cURL:

   ./WikiPage_POST_ToNode.sh {wiki-page-id}
   

   For Java:

   java -classpath .:* -DparentWikiPageId={wiki-page-id} WikiPage_POST_ToParent
   

   {
      ...
      "content" : "Foo",
      ...
      "description" : "Charlie Page",
      "encodingFormat" : "text/x-wiki",
      ...
      "headline" : "Charlie Page",
      "id" : 38510,
      ...
   }
   

7. Execute WikiPages_GET_FromNode using the Wiki node ID for its parameter. This returns a list of all Wiki pages added to the specified node, which includes both of the newly created Wiki pages.

   For cURL:

   ./WikiPages_GET_FromNode.sh {wiki-node-id}
   

   For Java:

   java -classpath .:* -DwikiNodeId={wiki-node-id} WikiPages_GET_FromNode
   

8. Execute WikiPages_GET_FromParent using the Wiki parent page ID for its parameter. This returns any existing child pages for the specified Wiki page.

   For cURL:

   ./WikiPages_GET_FromParent.sh {wiki-page-id}
   

   For Java:

   java -classpath .:* -DparentWikiPageId={wiki-page-id} WikiPages_GET_FromParent
   

9. Execute WikiPage_PUT_ById using either of the above Wiki page IDs for its parameter. This replaces the original page’s content with the content defined in the API call.

   For cURL:

   ./WikiPage_PUT_ById.sh {wiki-page-id}
   

   For Java:

   java -classpath .:* -DwikiPageId={wiki-page-id} WikiPage_PUT_ById
   

   {
     "content" : "Bar",
     ...
     "encodingFormat" : "text/x-wiki",
     ...
     "headline": "Baker Page",
     "id" : 38515,
     ...
   }
   

10. Execute WikiPage_DELETE_ById using the desired Wiki page ID for its parameter. This deletes the specified Wiki page.

    For cURL:

    ./WikiPage_DELETE_ById.sh {wiki-page-id}
    

    For Java:

    java -classpath .:* -DwikiPageId={wiki-page-id} WikiPage_DELETE_ById
    

11. Execute WikiPage_GET_ById using the deleted Wiki page’s ID for its parameter. This returns the details for the specified page if it exists.

    For cURL:

    ./WikiPage_GET_ById.sh {wiki-page-id}
    

    For Java:

    java -classpath .:* -DwikiPageId={wiki-page-id} WikiPage_GET_ById
    

    Since the page was deleted in the preceding step, you see the following message.

    {
      "status" : "NOT_FOUND",
      "title" : "No WikiNode exists with the primary key 38515"
    }
    

Tutorial Code Reference

The provided sample code includes cURL scripts and Java classes for the following WikiNode and WikiPage APIs.

Sample WikiNode APIs

Service	HTTP Method	HTTP Endpoint	Description
WikiNode	POST	/v1.0/sites/[siteId]/wiki-nodes	Creates a new Wiki node in the specified Site using the details provided in the API call
WikiNode	GET	/v1.0/sites/[siteId]/wiki-nodes	Returns a complete list of all Wiki nodes in the specified Site; results can be paginated, filtered, searched, and sorted
WikiNode	GET	/v1.0/wiki-nodes/[wikiNodeId]	Returns details for the specified node entity
WikiNode	PUT	/v1.0/wiki-nodes/[wikiNodeId]	Replaces the specified node’s details with those provided in the API call
WikiNode	DELETE	/v1.0/wiki-nodes/[wikiNodeId]	Deletes the specified node and returns a 204 if the operation succeeds

Sample WikiPage APIs

Service	HTTP Method	HTTP Endpoint	Description
WikiPage	POST	/v1.0/wiki-nodes/[wikiNodeId]/wiki-pages	Creates a new Wiki page in the specified node using the details provided in the API call
WikiPage	POST	/v1.0/wiki-pages/[parentWikiPageId]/wiki-pages	Creates a new Wiki child page for the specified Wiki page using the details provided in the API call.
WikiPage	GET	/v1.0/wiki-nodes/[wikiNodeId]/wiki-pages	Returns a complete list of all Wiki pages added to the specified Wiki node; results can be paginated, filtered, searched, and sorted
WikiPage	GET	/v1.0/wiki-pages/[parentWikiPageId]/wiki-pages	Returns a complete list of all Wiki child pages added to the specified Wiki page; results can be paginated, filtered, searched, and sorted
WikiPage	GET	/v1.0/wiki-pages/[wikiPageId]	Returns details for the specified Wiki page entity
WikiPage	PUT	/v1.0/wiki-pages/[wikiPageId]	Replaces the specified page’s details with those provided in the API call
WikiPage	DELETE	/v1.0/wiki-pages/[wikiPageId]	Deletes the specified page and returns a 204 if the operation succeeds

important

When using POST and PUT methods for Wiki pages, you must define both the headline and encodingFormat fields. The headline field sets the page’s main title, while the encodingFormat field determines the page’s media format (e.g., HTML, BBCode, etc.).

Examining the Sample cURL Scripts

The following are representative examples of the tutorial’s cURL commands.

curl \
	"http://localhost:8080/o/headless-delivery/v1.0/sites/${1}/wiki-nodes" \
	--data-raw '
		{
			"description": "Foo",
			"name": "Able Node"
		}' \
	--header "Content-Type: application/json" \
	--request "POST" \
	--user "[e-mail]:learn"

WikiPage_POST_ToNode.sh

curl \
	"http://localhost:8080/o/headless-delivery/v1.0/wiki-nodes/${1}/wiki-pages" \
	--data-raw '
		{
			"content": "Foo",
			"encodingFormat": "text/x-wiki",
			"headline": "Able Page"
		}' \
	--header "Content-Type: application/json" \
	--request "POST" \
	--user "[e-mail]:learn"

WikiPages_GET_FromNode.sh

curl \
	"http://localhost:8080/o/headless-delivery/v1.0/wiki-nodes/${1}/wiki-pages" \
	--user "[e-mail]:learn"

Examining the Sample Java Classes

The following are representative examples of the tutorial’s Java commands.

WikiNode_POST_ToSite.java

public class WikiNode_POST_ToSite {

	/**
	 * java -classpath .:* -DsiteId=1234 WikiNode_POST_ToSite
	 */
	public static void main(String[] args) throws Exception {
		WikiNodeResource.Builder builder = WikiNodeResource.builder();

		WikiNodeResource wikiNodeResource = builder.authentication(
			"[e-mail]", "learn"
		).build();

		WikiNode wikiNode = wikiNodeResource.postSiteWikiNode(
			Long.valueOf(System.getProperty("siteId")),
			new WikiNode() {
				{
					description = "Foo";
					name = "Dog Node";
				}
			});

		System.out.println(wikiNode);
	}

}

WikiPage_POST_ToNode.java

public class WikiPage_POST_ToNode {

	/**
	 * java -classpath .:* -DwikiNodeId=1234 WikiPage_POST_ToNode
	 */
	public static void main(String[] args) throws Exception {
		WikiPageResource.Builder builder = WikiPageResource.builder();

		WikiPageResource wikiPageResource = builder.authentication(
			"[e-mail]", "learn"
		).build();

		WikiPage wikiPage = wikiPageResource.postWikiNodeWikiPage(
			Long.valueOf(System.getProperty("wikiNodeId")),
			new WikiPage() {
				{
					content = "Foo";
					encodingFormat = "text/x-wiki";
					headline = "Dog Page";
				}
			});

		System.out.println(wikiPage);
	}

}

WikiPages_GET_FromNode.java

public class WikiPages_GET_FromNode {

	/**
	 * java -classpath .:* -DwikiNodeId=1234 WikiPages_GET_FromNode
	 */
	public static void main(String[] args) throws Exception {
		WikiPageResource.Builder builder = WikiPageResource.builder();

		WikiPageResource wikiPageResource = builder.authentication(
			"[e-mail]", "learn"
		).build();

		Page<WikiPage> page = wikiPageResource.getWikiNodeWikiPagesPage(
			Long.valueOf(System.getProperty("wikiNodeId")), null, null, null,
			Pagination.of(1, 2), null);

		System.out.println(page);
	}

}

Related Topics

• Using Liferay as a Headless Platform
• Consuming Rest Services