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A native Java library to talk to the Canvas REST API
package edu.ksu.canvas;
import edu.ksu.canvas.impl.*;
import edu.ksu.canvas.interfaces.*;
import edu.ksu.canvas.net.RestClient;
import edu.ksu.canvas.net.RefreshingRestClient;
import edu.ksu.canvas.oauth.OauthToken;
import org.apache.log4j.Logger;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.Map;
/**
* Entry point for using the Canvas API library. It constructs concrete
* implementations of reader/writer classes to perform API calls with.
* It must be constructed with a Canvas instance URL which will be used
* for all API calls. It has options to specify network timeouts and a way
* to control API pagination.
*/
public class CanvasApiFactory {
public static final Integer CANVAS_API_VERSION = 1;
private static final Logger LOG = Logger.getLogger(CanvasApiFactory.class);
private static final int DEFAULT_CONNECT_TIMEOUT_MS = 5000;
private static final int DEFAULT_READ_TIMEOUT_MS = 120000;
Map, Class> readerMap;
Map, Class> writerMap;
private String canvasBaseUrl;
private int connectTimeout;
private int readTimeout;
/**
* Construct an API factory for a given instance of Canvas.
* @param canvasBaseUrl The base URL used to access your Canvas instance
*/
public CanvasApiFactory(String canvasBaseUrl) {
LOG.debug("Creating Canvas API factory with base URL: " + canvasBaseUrl);
this.canvasBaseUrl = canvasBaseUrl;
this.connectTimeout = DEFAULT_CONNECT_TIMEOUT_MS;
this.readTimeout = DEFAULT_READ_TIMEOUT_MS;
setupClassMap();
}
/**
* Construct an API factory with specified timeout values
* @param canvasBaseUrl The base URL used to access your Canvas instance
* @param connectTimeout Connection timeout in milliseconds
* @param readTimeout Read timeout in milliseconds. If this is too low, longer API queries could time out prematurely
*/
public CanvasApiFactory(String canvasBaseUrl, int connectTimeout, int readTimeout) {
this.canvasBaseUrl = canvasBaseUrl;
this.connectTimeout = connectTimeout;
this.readTimeout = readTimeout;
setupClassMap();
}
/**
* Get a reader implementation class to perform API calls with.
* @param type Interface type you wish to get an implementation for
* @param oauthToken An OAuth token to use for authentication when making API calls
* @param The reader type to request an instance of
* @return A reader implementation class
*/
public T getReader(Class type, OauthToken oauthToken) {
return getReader(type, oauthToken, null);
}
/**
* Get a reader implementation class to perform API calls with while specifying
* an explicit page size for paginated API calls. This gets translated to a per_page=
* parameter on API requests. Note that Canvas does not guarantee it will honor this page size request.
* There is an explicit maximum page size on the server side which could change. The default page size
* is 10 which can be limiting when, for example, trying to get all users in a 800 person course.
* @param type Interface type you wish to get an implementation for
* @param oauthToken An OAuth token to use for authentication when making API calls
* @param paginationPageSize Requested pagination page size
* @param The reader type to request an instance of
* @return An instance of the requested reader class
*/
public T getReader(Class type, OauthToken oauthToken, Integer paginationPageSize) {
LOG.debug("Factory call to instantiate class: " + type.getName());
RestClient restClient = new RefreshingRestClient();
@SuppressWarnings("unchecked")
Class concreteClass = (Class)readerMap.get(type);
if (concreteClass == null) {
throw new UnsupportedOperationException("No implementation for requested interface found: " + type.getName());
}
LOG.debug("got class: " + concreteClass);
try {
Constructor constructor = concreteClass.getConstructor(String.class, Integer.class,
OauthToken.class, RestClient.class, Integer.TYPE, Integer.TYPE, Integer.class, Boolean.class);
return constructor.newInstance(canvasBaseUrl, CANVAS_API_VERSION, oauthToken, restClient,
connectTimeout, readTimeout, paginationPageSize, false);
} catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException | InstantiationException e) {
throw new UnsupportedOperationException("Unknown error instantiating the concrete API class: " + type.getName(), e);
}
}
/**
* Get a writer implementation to push data into Canvas.
* @param type Interface type you wish to get an implementation for
* @param oauthToken An OAuth token to use for authentication when making API calls
* @param A writer implementation
* @return A writer implementation class
*/
public T getWriter(Class type, OauthToken oauthToken) {
return getWriter(type, oauthToken, false);
}
/**
* Get a writer implementation to push data into Canvas while being able to control the behavior of blank values.
* If the serializeNulls parameter is set to true, this writer will serialize null fields in the JSON being
* sent to Canvas. This is required if you want to explicitly blank out a value that is currently set to something.
* @param type Interface type you wish to get an implementation for
* @param oauthToken An OAuth token to use for authentication when making API calls
* @param serializeNulls Whether or not to include null fields in the serialized JSON. Defaults to false if null
* @param A writer implementation
* @return An instantiated instance of the requested writer type
*/
public T getWriter(Class type, OauthToken oauthToken, Boolean serializeNulls) {
LOG.debug("Factory call to instantiate class: " + type.getName());
RestClient restClient = new RefreshingRestClient();
@SuppressWarnings("unchecked")
Class concreteClass = (Class) writerMap.get(type);
if (concreteClass == null) {
throw new UnsupportedOperationException("No implementation for requested interface found: " + type.getName());
}
LOG.debug("got writer class: " + concreteClass);
try {
Constructor constructor = concreteClass.getConstructor(String.class, Integer.class, OauthToken.class,
RestClient.class, Integer.TYPE, Integer.TYPE, Integer.class, Boolean.class);
return constructor.newInstance(canvasBaseUrl, CANVAS_API_VERSION, oauthToken, restClient,
connectTimeout, readTimeout, null, serializeNulls);
} catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException | InstantiationException e) {
throw new UnsupportedOperationException("Unknown error instantiating the concrete API class: " + type.getName(), e);
}
}
private void setupClassMap() {
readerMap = new HashMap<>();
writerMap = new HashMap<>();
readerMap.put(AccountReader.class, AccountImpl.class);
readerMap.put(AdminReader.class, AdminImpl.class);
readerMap.put(AssignmentOverrideReader.class, AssignmentOverrideImpl.class);
readerMap.put(AssignmentReader.class, AssignmentImpl.class);
readerMap.put(ConversationReader.class, ConversationImpl.class);
readerMap.put(CourseReader.class, CourseImpl.class);
readerMap.put(TabReader.class, TabImpl.class);
readerMap.put(EnrollmentReader.class, EnrollmentImpl.class);
readerMap.put(QuizQuestionReader.class, QuizQuestionImpl.class);
readerMap.put(QuizReader.class, QuizImpl.class);
readerMap.put(QuizSubmissionQuestionReader.class, QuizSubmissionQuestionImpl.class);
readerMap.put(QuizSubmissionReader.class, QuizSubmissionImpl.class);
readerMap.put(SectionReader.class, SectionsImpl.class);
readerMap.put(UserReader.class, UserImpl.class);
readerMap.put(PageReader.class, PageImpl.class);
readerMap.put(EnrollmentTermReader.class, EnrollmentTermImpl.class);
readerMap.put(SubmissionReader.class, SubmissionImpl.class);
readerMap.put(AssignmentGroupReader.class, AssignmentGroupImpl.class);
readerMap.put(RoleReader.class, RoleImpl.class);
readerMap.put(ExternalToolReader.class, ExternalToolImpl.class);
readerMap.put(LoginReader.class, LoginImpl.class);
readerMap.put(CalendarReader.class, CalendarEventImpl.class);
readerMap.put(AccountReportSummaryReader.class, AccountReportSummaryImpl.class);
readerMap.put(AccountReportReader.class, AccountReportImpl.class);
writerMap.put(AssignmentOverrideWriter.class, AssignmentOverrideImpl.class);
writerMap.put(AdminWriter.class, AdminImpl.class);
writerMap.put(AssignmentWriter.class, AssignmentImpl.class);
writerMap.put(ConversationWriter.class, ConversationImpl.class);
writerMap.put(CourseWriter.class, CourseImpl.class);
writerMap.put(TabWriter.class, TabImpl.class);
writerMap.put(EnrollmentWriter.class, EnrollmentImpl.class);
writerMap.put(QuizQuestionWriter.class, QuizQuestionImpl.class);
writerMap.put(QuizWriter.class, QuizImpl.class);
writerMap.put(QuizSubmissionQuestionWriter.class, QuizSubmissionQuestionImpl.class);
writerMap.put(QuizSubmissionWriter.class, QuizSubmissionImpl.class);
writerMap.put(SectionWriter.class, SectionsImpl.class);
writerMap.put(UserWriter.class, UserImpl.class);
writerMap.put(PageWriter.class, PageImpl.class);
writerMap.put(SectionWriter.class, SectionsImpl.class);
writerMap.put(SubmissionWriter.class, SubmissionImpl.class);
writerMap.put(AssignmentGroupWriter.class, AssignmentGroupImpl.class);
writerMap.put(RoleWriter.class, RoleImpl.class);
writerMap.put(ExternalToolWriter.class, ExternalToolImpl.class);
writerMap.put(LoginWriter.class, LoginImpl.class);
writerMap.put(CalendarWriter.class, CalendarEventImpl.class);
writerMap.put(AccountReportSummaryWriter.class, AccountReportSummaryImpl.class);
writerMap.put(AccountReportWriter.class, AccountReportImpl.class);
}
}