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mwleinad/lti.jsp

Last active April 12, 2018 14:55
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Embed LTI and Oauth signature on jsp
Raw
lti.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ page import="blackboard.platform.session.*,
java.util.*,
java.net.*,
blackboard.data.user.*,
blackboard.persist.*,
blackboard.data.course.*,
blackboard.persist.course.*,
javax.crypto.spec.SecretKeySpec,
blackboard.data.role.*,
javax.crypto.SecretKey,
blackboard.data.course.CourseMembership.*,
java.util.Base64.Encoder,org.apache.commons.codec.binary.Base64,
javax.crypto.Mac"
errorPage="../error.jsp"%>
<%@page import="com.spvsoftwareproducts.blackboard.utils.B2Context" errorPage="../error.jsp"%>
<%@page import="iloslib.*,
iloslib.models.*,
iloslib.collections.*,
iloslib.repositories.*"
errorPage ="../error.jsp" %>
<%@ page import="java.sql.Array" %>
<%@ taglib uri="/bbNG" prefix="bbNG"%>
<%@ taglib uri="/bbNG" prefix="bbNG"%>
<%@ taglib uri="/bbData" prefix="bbData"%>
<%@ page isErrorPage="true" %>
<bbData:context id="ctx">
<bbNG:learningSystemPage ctxId="ctx2" hideCourseMenu="1" >
<%
String SERVER_NAME = "server-name";
String API_KEY = "api-key";
String API_SECRET = "secret-key";
B2Context b2Context = new B2Context(request);
String jQueryPath = b2Context.getPath() + "js/jquery.min.js";
String returnUrl = b2Context.getServerUrl() + b2Context.getPath() + "handler/ltiSuccess.jsp";
String apiKey = b2Context.getSetting(API_KEY);
String instanceName = b2Context.getServerUrl();
String server = b2Context.getSetting(SERVER_NAME);
String endPoint = server + "/lti/embed";
String familyCode = "BlackboardBB";
String selectionDirective = "embed_content";
String intendedUse = "embed";
User user = b2Context.getContext().getUser();
String email = user.getEmailAddress();
String name = user.getGivenName();
//Weird bug that converts spaces to + so I'm just removing any space from the name
name = name.replaceAll("\\s+","");
CourseMembership courseMembership = b2Context.getContext().getCourseMembership();
Role role = courseMembership.getRole();
//Just as the ilos app, the token is null, so we have to add the extra &
String secret = b2Context.getSetting(API_SECRET)+"&";
String basePostString = "POST&" + URLEncoder.encode(endPoint) + "&";
//Manually create a base string and signature, they have to be in alphabetic order
String baseStringParameters = "ext_content_intended_use=" + intendedUse +
"&launch_presentation_return_url=" + URLEncoder.encode(returnUrl) +
"&lis_person_contact_email_primary=" + URLEncoder.encode(email) +
"&lis_person_name_given=" + URLEncoder.encode(name) +
"&oauth_consumer_key=" + apiKey +
"&roles=" + URLEncoder.encode(role.toString()) +
"&selection_directive=" + selectionDirective +
"&tool_consumer_info_product_family_code=" + familyCode +
"&tool_consumer_instance_name=" + URLEncoder.encode(instanceName);
String baseString = basePostString + URLEncoder.encode(baseStringParameters);
//As in the app we need to sign the baseString using HmacSHA1 and after that we encodeBase64 the baseString
SecretKeySpec keySpec = new SecretKeySpec(secret.getBytes(), "HmacSHA1");
Mac mac = Mac.getInstance("HmacSHA1");
mac.init(keySpec);
byte[] text = baseString.getBytes();
String signature = new String(Base64.encodeBase64(mac.doFinal(text))).trim();
%>
<bbNG:jsFile href="<%=jQueryPath %>"/>
<bbNG:jsBlock>
<script type="text/javascript">
jQuery.noConflict();
// Use jQuery via jQuery(...)
jQuery(document).ready(function(){
jQuery("#ltiPost").submit();
});
</script>
</bbNG:jsBlock>
<bbNG:cssFile href="../css/IlosB2.css"/>
<bbNG:cssFile href="../css/jquery.fancybox.css" />
<<form method="post" id="ltiPost" name="ltiPost" action="<%=server%>/lti/embed">
<input type="hidden" name="ext_content_intended_use" id="ext_content_intended_use" value="<%=intendedUse%>">
<input type="hidden" name="launch_presentation_return_url" id="launch_presentation_return_url" value="<%=returnUrl%>">
<input type="hidden" name="lis_person_contact_email_primary" id="lis_person_contact_email_primary" value="<%=email%>">
<input type="hidden" name="lis_person_name_given" id="lis_person_name_given" value="<%=name%>">
<input type="hidden" name="oauth_consumer_key" id="oauth_consumer_key" value="<%=apiKey%>">
<input type="hidden" name="roles" id="roles" value="<%=role.toString()%>">
<input type="hidden" name="tool_consumer_instance_name" id="tool_consumer_instance_name" value="<%=instanceName%>">
<input type="hidden" name="selection_directive" id="selection_directive" value="<%=selectionDirective%>">
<input type="hidden" name="tool_consumer_info_product_family_code" id="tool_consumer_info_product_family_code" value="<%=familyCode%>">
<input type="hidden" name="oauth_signature" id="oauth_signature" value="<%=signature%>">
<input type="hidden" name="baseString" id="baseString" value="<%=baseString%>">
</form>
</bbNG:learningSystemPage>
</bbData:context>
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