Asana

Java client library for the Asana API.

Installation

If you use Maven to manage dependencies you can include the "asana" artifact by adding it as a dependency in your pom.xml file.

<dependency>
     <groupId>com.asana</groupId>
     <artifactId>asana</artifactId>
     <version>0.4.1</version>
</dependency>

Or, you can build the artifact and install it to your local Maven repository:

mvn install

Compile

mvn compile

Test

mvn test

Examples

Be sure to run mvn compile first.

Set the ASANA_ACCESS_TOKEN, ASANA_CLIENT_ID, and ASANA_CLIENT_SECRET environment variables. The app's redirect URL should be set to "urn:ietf:wg:oauth:2.0:oob" for command line scripts examples, and "http://localhost:5000/auth/asana/callback" for the server example.

export ASANA_ACCESS_TOKEN="X"
export ASANA_CLIENT_ID="X"
export ASANA_CLIENT_SECRET="X"

Web application example:

mvn exec:java -Dexec.mainClass="com.asana.examples.ExampleServer"

OAuth command line script example:

mvn exec:java -Dexec.mainClass="com.asana.examples.ExampleOAuth"

Personal access token command line script example:

mvn exec:java -Dexec.mainClass="com.asana.examples.ExamplePersonalAccessToken"

Demo create a task and upload an attachment:

mvn exec:java -Dexec.mainClass="com.asana.examples.ExampleCreateTaskAndUpload"

Demo create project and stream change events:

mvn exec:java -Dexec.mainClass="com.asana.examples.ExampleCreateProjectAndStreamEvents"

Authentication

Personal Access Token

Create a client using a personal access token:

Client client = Client.accessToken("ASANA_ACCESS_TOKEN");

OAuth 2

Asana supports OAuth 2. java-asana handles some of the details of the OAuth flow for you.

Create a client using your OAuth Client ID and secret:

Client client = Client.oauth(
    "ASANA_CLIENT_ID"
    "ASANA_CLIENT_SECRET"
    "urn:ietf:wg:oauth:2.0:oob"
);

Redirect the user to the authorization URL obtained from the client's session object:

OAuthDispatcher dispatcher = (OAuthDispatcher)client.dispatcher;
String url = dispatcher.getAuthorizationUrl()

getAuthorizationUrl() takes an optional state parameter to be used for preventing CSRF attacks:

String state = UUID.randomUUID().toString();
String url = dispatcher.getAuthorizationUrl(state);

When the user is redirected back to your callback, check the state URL parameter matches, then pass the code parameter to obtain a bearer token:

if (request.param("state").equals(state)) {
  String token = dispatcher.fetchToken(request.params("code"));
  // ... 
} else {
  // error! possible CSRF attack
}

Note: if you're writing a non-browser-based application (e.x. a command line tool) you can use the special redirect URI urn:ietf:wg:oauth:2.0:oob to prompt the user to copy and paste the code into the application.

Usage

The client's methods are divided into several resources: attachments, events, projects, stories, tags, tasks, teams, users, and workspaces.

Request methods use the "builder" pattern to set query string or JSON body parameters, and various request options, so a request must be initated using the execute or executeRaw methods:

Methods that return a single object return that object directly:

User me = client.users.me().execute();
System.out.println("Hello " + name.name);

String workspaceId = me.workspaces.get(0).id;
Project project = client.projects.createInWorkspace(workspaceId)
    .data("name", "new project")
    .execute();
System.out.println("Created project with id: " + project.id);

Methods that return multiple items (e.x. findAll) return an Iterable object. See the "Collections" section

Options

Various options can be set globally on the Client.DEFAULTS object, per-client on client.options, or per-request using the option method. For example:

// global:
Client.DEFAULTS.put("page_size", 1000);

// per-client:
client.options.put("page_size", 1000);

// per-request:
client.tasks.findAll().query("project", 1234).option("page_size", 1000).execute();

Available options

base_url (default: "https://app.asana.com/api/1.0"): API endpoint base URL to connect to
max_retries (default: 5): number to times to retry if API rate limit is reached or a server error occures. Rate limit retries delay until the rate limit expires, server errors exponentially backoff starting with a 1 second delay.
fields and expand: array of field names to include in the response, or sub-objects to expand in the response. For example .option("fields", Arrays.asList("followers", "assignee")). See API documentation

Collections (methods returning an array as it's 'data' property):

item_limit (default: -1): limits the total number of items of a collection to return (spanning multiple requests in the case of an iterator).
page_size (default: 50): limits the number of items per page to fetch at a time when using an iterator.
offset: offset token returned by previous calls to the same method, when using executeRaw() (in response.nextPage.offset)

Events:

poll_interval (default: 5): polling interval for getting new events via an EventsRequest iterator (e.x. for (Event event : client.events.get(resourceId)) { ... })
sync: sync token returned by previous calls to events.get (e.x. client.events.get(resourceId, syncToken).executeRaw().sync)

Collections

Items Iterator

APIs that return a collection return a CollectionsRequest, which is an iterable:

Iterable<Workspace> workspaces = client.workspaces.findAll();
for (Workspace workspace: workspaces) {
    System.out.println("Workspace: " + workspace.name);
}

Internally the iterator may make multiple HTTP requests, with the number of requested results per page being controlled by the page_size option.

Raw API

You can also use the raw API to fetch a page at a time:

String offset = null;
while (true) {
    ResultBodyCollection<Workspace> page = client.workspaces.findAll()
            .option("offset", offset)
            .option("limit", 2)
            .executeRaw();
    System.out.println("received " + page.data.size() + " results");
    if (page.nextPage != null) {
        offset = page.nextPage.offset;
    } else {
        break;
    }
}

Deployment

To deploy a new version to the Maven Central Repository, you can run:

mvn deploy -P release --settings settings.xml

Before you do this, you must set a few environment variables to authenticate:

Maven credentials: MAVEN_USERNAME and MAVEN_PASSWORD
GPG keyname and password: MAVEN_GPG_KEYNAME and MAVEN_GPG_PASSWORD

You then can log in to close and deploy the release.

frederikheremans / java-asana