Your Data In the Major Leagues:A Practical Guide to REST ServicesSerdar BasegmezManaging Director,Developi Information Systems

DEV-1383 IBM Connect 2017 Conference, 20-23 February 2017

• IBM Champion (2011 - 2017)

• Developi Information Systems, Istanbul

• OpenNTF / LUGTR / LotusNotus.com

• Featured on…

• Engage UG, IBM Connect, ICON UK, NotesIn9…

Serdar Başeğmez

Agenda• RESTful Architecture

• Practical Implications

• Advantages of RESTful Services

• Providing REST Services for IBM Domino

• Consuming REST Services for IBM Domino

• Wrap-up

RESTful Web Services

Representational state transfer (REST) is an architectural style used for web development. Systems and sites designed using this style aim for fast performance, reliability and the ability to scale (to grow and easily support extra users). To achieve these goals, developers work with reusable components that can be managed and updated without affecting the system as a whole while it is running.

Source: https://en.wikipedia.org/wiki/Representational_state_transfer

History

Old School Web Applications

Source: https://speakerdeck.com/jeffschenck/rest-easy-api-security-done-right

User Interface Business Logic Datastore

Front-end Back-end

ASP, PHP, CGI, Web Agents, JSP, etc.

← HTML, CSS, JavaScriptForms →

Web Applications Evolving

User Interface Business Logic Datastore

Front-end Back-end

Async web apps, Ruby on Rails, Django, JSF, XPages, etc.

← HTML, CSS, JavaScriptForms, AJAX →

Web Applications Evolving

User Interface Business Logic Datastore

Front-end Back-end

Modern Web frameworks, Angular.js, React.js, etc.

← HTML, CSS, JavaScript ← REST →

[Web] Applications Evolving

User Interface Business Logic Datastore

Mobile ApplicationsBack-end

Modern Web frameworks, Angular.js, React.js, etc.

← HTML, CSS, JavaScript ← REST →

Front-end

[Web] Applications Evolving

User Interface Business Logic Datastore

Mobile Applications Back-end

Modern Web frameworks, Angular.js, React.js, etc.

← HTML, CSS, JavaScript

← REST →

Front-end Microservice Microservice Microservice

RESTful, Everywhere!Solid Architecture

Well-defined practicesWidespread use in modern frameworks

Easily consumable, even in micro environmentsDelivers performance & scalability

Stateless / Cacheable / LayeredEvery request processed independently

Client does not care who cooked the meal in the kitchenEverything cacheable

⇣Scalable, Robust, Resilient

The Conversation Makes Sense!

Source: http://www.bizcoder.com/a-fresh-coat-of-rest-paint-on-a-soap-stack

The Conversation Makes Sense!GET/twink/contacts/DLEY-ACLH6YHTTP/1.1Host:homer.developi.infoCache-Control:no-cache

{"zip":"13202","state":"NY","lastName":"Abbate","middle":"J","country":"US","emailAddress":"Jessica.J.Abbate@trashymail.com","number":"DLEY-ACLH6Y","city":"Syracuse","firstName":"Jessica"}

The Conversation Makes Sense!http://appserver.company.com/apps/contacts.nsf/

GiveMeTheContactWeNeedPleaseAgent?OpenAgent&id=1522

or…

http://appserver.company.com/api/contacts/1522

Conventions on URLs

GET http://appserver.company.com/api/contacts GET http://appserver.company.com/api/contacts/UK/London

POST http://appserver.company.com/api/contacts

Retrieve Contacts / Create a new Contact…

Conventions on URLs

GET http://appserver.company.com/api/contacts/1522 PUT http://appserver.company.com/api/contacts/1522

DELETE http://appserver.company.com/api/contacts/1522

Retrieve/Update/Delete the Contact resource with id=1522…

URI GET PUT POST DELETE

/contacts/ List Contacts Replace Contacts Create New Contact Delete Contacts

/contacts/id Retrieve a Contact Replace a Contact N/A (generally) Delete a Contact

Source: https://en.wikipedia.org/wiki/Representational_state_transfer

Conventions on URLs

Unconventional uses in URLs

GET https://api.twitter.com/1.1/statuses/show.json?id=1234567890

Retrieve the Tweet with id=1234567890…

RESTful Servicesfor

IBM Domino Applications

Some Inspiration• Alternative Front-ends

• Alternative Web Frameworks (Angular.js, React.js, etc.) / Mobile Applications

• Integration with Custom applications/services to share data and process

• Getting a list of customers from CRM, let SCM to initiate Purchase Request on Domino

• Upload a file into Box, using tone analyser from IBM Watson, send message into Slack

• Webhooks• Notify or get notified about what happened

• Other

• Enhancing In-page user experience with grids, quick searches, better type-aheads, etc.

Example: Slack Bot for XSnippets

Slack Server

Slack Client

OpenNTF Server

XSnippets.nsf

XSlack REST Provider

/xsnippets[params]

MessageResponse

GETRequest FTSearch

SearchResults

MessageResponse

GEThttp://openntf.org/xsnippets.nsf/slack.xsp?text=xagentRequest:

Herearesearchresultsfor'xagent'1.ScheduledXAgent-NONSSL<http://...>2.Use@TransformtobuildJSONandconsumetheoutputinanXAgent<http://...>3.ControllingtheHTTPresponsestatuscodeinXPages<http://...>4.BuildJSONfromNotesViewwithsupportofmulti-valuefields<http://...>5.ScheduledXAgent-SSLEncrypted<http://...>

Response:

Example: Box Webhooks Integration

Box Servers

Box Web

Company Server

Demo.nsf

REST ServicePOSTRequest Actions

200SuccessResponse

POSThttp://MyServer.com/MyRestServiceAddress{"source":{"name":"someFile.xyz","parent":{"name":"someFolder","type":"folder"},......},"trigger":"FILE.UPLOADED","type":"webhook_event",........}

Request:

BoxSync

UploadFileDeleteFile

Comment

RESTful Services on Domino

IBM Domino Server

Web Apps Agents

IBM Notes Client

RESTful Services

As Consumer

Browser

Remote Applications

As Provider

Provider

Consumer

Providing RESTful Servicesfor

IBM Domino Applications

Domino Access Services• Provided and Supported by IBM

• Fully functional RESTful API for Domino Data

• Access to Views/Folders/Documents/Collections/Fields/Calendar

• Support for caching

• Mail and FreeBusy services added by ExtLib OpenNTF version

• Inherently uses standard security model (ACL, readers/authors…)

• Server-level/Database-level/Design-level control over availability

Domino Access Services• No coding needed, Immediately available after a few settings.

Enable on Server Enable For Database Enable For Views

Domino Access Services• Drawbacks:

• No control over the data!

• Reading a document —> Read All fields

• Creating a document —> No checkpoints!

• No place for business logic!

• What about actions? The responsibility is on the consumer

• Everything or Nothing

• Exposes internals

• You should trust consumers and the environment…

REST Components (ExtLib)• Provided and Supported by IBM

• Access to Views/Folders/Documents/Collections/Fields/Calendar

• Customizable component for RESTful access• Computed/Filtered columns, Custom search, etc.

• Event model helps building business logic on top of REST model

• Custom REST Service• Write your own SSJS or Java bean

• Write your CSJS routines for async access (Remote Service / JSON-RPC)

• Dojo support for single page model

REST Components (ExtLib)• Setup REST component(s) on your page.

• Minimal coding, no administrator needed.

Add to your XPage Add a Service Configure Options

REST Components (ExtLib)• Drawbacks:

• Careful with the code organization…

• You might inevitably end up with a spaghetti code!

• Error handling is crucial

• Prefer CustomRestService with a Java bean for more advanced stuff…

• Not optimised for performance and scalability

• Difficult to follow RESTful URL Convention

• e.g. https://someserver.domain.com/database.nsf/somepage.xsp/service/…

Hardcoding (Web agents, XAgents, Servlets…)• Old school way to create services, but still quite useful for some cases.

• Great if you have pre-existing code (e.g. Lotusscript libraries, etc.)

• Customizable, flexible and simple way to create any service

Hardcoding (Web agents, XAgents, Servlets…)• Drawbacks:

• Hardcode everything…

• e.g. Header/parameter extraction

• Careful with the code organization…

• You might inevitably end up with a spaghetti code!

• Error handling is crucial

• Difficult to follow RESTful URL Convention

• e.g. https://someserver.domain.com/database.nsf/xagent.xsp?…

• e.g. https://someserver.domain.com/database.nsf/someagent?OpenAgent&…

Apache Wink Servlets• IBM Domino includes Apache Wink 1.1.2

• An implementation of JAX-RS

• JAX-RS: ‘Java-ish’ way to define RESTful services

• Create JAX-RS based REST services on top of OSGi plugins.

• Complete Java solution, extensible with custom providers

• Compatible with OpenNTF Domino API

• Code reusability outside IBM Domino world.

Apache Wink Runtime Application Code

Apache Wink Basic Architecture

Wink Servlet(Customizable)

HTTP/HTTPS Client

Datastore

Resource

Resource

Resource

Resource

ControllersData Accessors

Tools/Utilities

Request Processor

Helpers

/BaseURI/* /BaseURI/Path-Patterns

@Path("/contacts")publicclassContactResource{

privateDominoAccessoraccessor=newDominoAccessor(ContextInfo.getUserSession()); @GET() publicResponsegetContactList(@QueryParam("start")intstart,@QueryParam("count")intcount){ List<Contact>contactList=accessor.pullContacts(start,count); Stringresult=ModelUtils.toJson(contactList).toString(); returnResponse.ok(result,MediaType.APPLICATION_JSON).build(); } @Path("/{id}") @GET() publicResponsegetContact(@PathParam("id")Stringid){ Contactcontact=accessor.findContact(id);

if(null==contact){ thrownewWebApplicationException(Response.Status.NOT_FOUND); }else{ Stringresult=ModelUtils.toJson(contact).toString(); returnResponse.ok(result,MediaType.APPLICATION_JSON).build(); } }}

{"zip":"13202","state":"NY","lastName":"Abbate","middle":"J","country":"US","emailAddress":"Jessica.J.Abbate@trashymail.com","number":"DLEY-ACLH6Y","city":"Syracuse","firstName":"Jessica"}

Contact Resource Class

Contact ResourceShort JSON Representation

Apache Wink Servlets• Drawbacks:

• Plugin only

• Difficult if you are not familiar

• Takes time to learn

• Overkill?

• Not suitable for small projects and simple needs

• Apache Wink is old school

• Not that bad, IBM still using Wink. But Apache took another way.

• Alternatives: RESTEasy, Jersey, Apache CXF, etc.

• Integrating a new module into Domino might be an issue

Providing RESTful Services on DominoBenefits Challenges Suggested When?

Domino Access Services (DAS)

No Backend CodeZero-setup

Limited ControlNo Business Logic

Exposes the InternalsSimple internal integrations

ExtLib Components for REST

Less Backend CodeMinimal Setup

Partial/Full Customization

Error HandlingSpaghetti Code Risk

URL Convention

Simple needs for a limited scope

Hardcoding (XAgents, Web agents,

Servlets)

Tailor-made(Almost) No Learning Curve

Hardcoding EverythingSpaghetti Code Risk

URL Conventions

Very specific needs for a limited scope

Apache Wink ServletsTailor-made

Based on JAX-RSOSGi Benefits

Learning CurveBarrier to Entry

Large scope implementation,

API Design

Consuming RESTful Servicesfor

IBM Domino Applications

How to Consume any RESTful Service?• It is just an HTTP Request…

• Questions to ask:• Lotusscript or Java or SSJS?

• On-demand or Background?

• The remote service has an SDK?

• Who is going to be authenticated?

Java or SSJS or Lotusscript?• Lotusscript

• No internal support for Networking…

• On Windows platform, we can use COM objects

• Call Java via LS2J

• Server-side JavaScript

• Use Java!

• Java

• Core Java provides URLConnection class for basic operations

• Open source libraries are preferred (e.g. Apache HttpComponents)

Connecting LotusScript• Pulling exchange rates (When needed or on a schedule)

Set rates = CreateObject("msxml2.DOMDocument" )

rates.async = False rates.validateOnParse = False

rates.setProperty "ServerHTTPRequest" ,True If rates.load("http://www.tcmb.gov.tr/kurlar/today.xml" ) Then

Set currencies =rates.getElementsByTagName("Currency" )

For i=0 To currencies.length - 1Set node=currencies.item(i)If node.attributes.getNamedItem("Kod").value="USD" Then

For j=0 To node.childnodes.length-1If node.childnodes.item(j).NodeName="ForexBuying" Then

forexBuyingUSD = node.childnodes.item(j).nodeTypedValueElseif node.childnodes.item(j).NodeName="ForexSelling" Then

forexSellingUSD = node.childnodes.item(j).nodeTypedValueEnd If

Next‘ Elseif for others…End If

Next

GetExchangeRates=TrueElse

GetExchangeRates=FalseEnd If

Using OLE Automation(or LS2J alternatively)

XML Parsing

Windows only!

Connecting Java• Pulling exchange rates via Java (When needed or on a schedule)

public Double receiveEurUsdRate() throws Exception {CloseableHttpClient httpclient = HttpClients.createDefault();HttpGet httpGet = new HttpGet("http://api.fixer.io/latest?base=USD");CloseableHttpResponse response = httpclient.execute(httpGet);

try { HttpEntity entity = response.getEntity(); // This is the worst practice ever! // We don't check anything! Everything can go wrong... JsonJavaObject ratesMap = (JsonJavaObject) JsonParser.fromJson(JsonJavaFactory.instanceEx,

EntityUtils.toString(entity));

JsonJavaObject rates = ratesMap.getAsObject("rates"); // We can write values into a NotesDocument return rates.getAsDouble("EUR");} finally { response.close();}

}

Create an HTTP client

Get a response

Convert to JSON

* Networking is a restricted operation for Agents! Agent Security should be configured.

Connecting SSJS• Pulling exchange rates on an XPage action

<xp:buttonid="button1" value="What is the exchange rate?"><xp:eventHandler

event="onclick"submit="true"refreshMode="partial"refreshId="computedField1"><xp:this.action><![CDATA[#{javascript:

viewScope.EurUsdRate = test.ExchangeRate.receiveEurUsdRate()}]]></xp:this.action>

</xp:eventHandler></xp:button>

We can also call Java!

* This code will run multiple times for each page cycle. Always cache values!

A Simple Example• Pulling exchange rates (When needed or on a schedule)

• Running from an Java Agent

• Apache HttpComponents and IBM Commons should be imported.

• Agent Security should be configured

• Running from an XPage / Java or SSJS

• Apache HttpComponents should be imported.

• Time-outs and service hiccups should be considered

• Values should always be cached!

• Lotusscript

• Platform specific vs. LS2J

When/How to Connect?• Web Application triggers the RESTful conversation.

IBM Domino Server

Web AppsRESTful Service

Web Client

1. Click/Save/Update

2. REST Request

3. REST Response

4. Render Response

Latency!!!

When/How to Connect?• Web Application performs the RESTful conversation at the browser.

IBM Domino Server

Web Apps

RESTful ServiceWeb Client

1. CSJS Action 2. AJAX Request

3. AJAX Response4. Process Response

Latency!!!

CORS (Cross Origin Resource Sharing)?

When/How to Connect?• Notes Client performs the RESTful conversation

IBM Domino Server

Agent Manager

RESTful ServiceNotes Client

1. Run local code (Java/LS) 2. REST Request

3. REST Response

Latency!!!

4. Process Results

When/How to Connect?• Notes Client performs the RESTful conversation via a Server Agent

IBM Domino Server

Agent ManagerRESTful Service

Notes Client

1. Agent.RunOnServer()

2. REST Request

3. REST Response

4. Read Results

Latency!!!

Latency!!!

When/How to Connect?• RESTful conversation happens in the background

IBM Domino Server

Agent ManagerRESTful Service

1. Agent or DOTS run on a schedule

2. REST Request

3. REST Response

4. Process Results

DOTS

When/How to Connect?• More complicated scenarios…

IBM Domino Server

REST ServiceRESTful Service

RESTful Consumer

1. REST Call

3. REST Request

4. REST Response

6. Return response

Latency!!!

2.Process the Request

5. Process More

Why not SDK?• Many remote services provide a Java SDK or Wrapper

• Wrapper vs SDK

• Wrapper: Well-defined data model (e.g. POJO classes)

• SDK: No need to deal with low level operations

• Generally supported by the provider or the community

• But…• Compatibility issues (especially on Java Agents)

• e.g. IBM Watson SDK requires Java 7

• JVM Security issues

• Too much dependency, Poor documentation, etc.

Authentication• Who is going to be authenticated and how?

• Predefined credential or application key

• Single Sign-on

• Users with their own credentials on remote (OAuth, Saved password…)

Authentication• Predefined credential or application key

• Server to Server authentication

• Every REST request should be configured with proper keys

• Credential or Application key should be secured

• Not suitable for CSJS Model

Authentication• Users with their own credentials on the remote system

• Single Sign-on• Valid for integrations when SSO is available (e.g. IBM Connections)

• Works within the same domain!

• The remote system expects a token, generally in cookie form

• CSJS model will work without any modification

• When HTTP request passes through the server, cookie should be transferred

Authentication• Saved Password:

• Easy for the developer, but not convenient!

• Security risk, changing passwords, two-factor authentication, etc.

• Many applications do not allow credentials via API

• OAuth• Users can delegate their authentication to your application for a limited scope

• Domino has no native support, but possible with some effort (See Demo)

• IBM Social Business Toolkit SDK brings the support for OAUTH (well, sort of…)

Consuming RESTful ServicesUsage Examples

XPages Java - SSJS

Through SSJS or Java beansCalled when needed

Sending message to SlackIntegrations to IBM Watson

Social Media Interaction

AgentsJava - Lotusscript

Scheduled agentsCan be called by Notes Client

Periodically pulling exchange ratesPushing data to remote service

Training IBM Watson AI

Using SDKsXPages - OSGi

Access to services using external librariesCalled when needed

Scheduled using DOTSAccessing IBM Connections

Integration to Box

Demo

Stackoverflow - IBM Watson Demo

Browser

Box-Domino 3-legged OAuth Dance

Web ApplicationDomino Server

0.ClientIdisneededforinitiation

https://Box_Api_Url?client_id=<App_Client_Id>&redirect_uri=<Rest_Service_Url>WewillbuildaLinktoinitiatetheflow…

TokenStore

Callback REST

Browser

Box-Domino 3-legged OAuth Dance

Box Servers

Web ApplicationDomino Server

Login Page

0.ClientIdisneededforinitiation

1.RedirectUsertotheLoginPageTokenStore

Callback REST

Browser

Box-Domino 3-legged OAuth Dance

Box Servers

Web ApplicationDomino Server

Login Page

0.ClientIdisneededforinitiation

1.RedirectUsertotheLoginPageTokenStore

Callback REST

Boxwillasktheusertologinandrequestpermissionfortheapplication.

Browser

Box-Domino 3-legged OAuth Dance

Box Servers

Web ApplicationDomino Server

Login Page

0.ClientIdisneededforinitiation

1.RedirectUsertotheLoginPage

2.UserAcceptedthePermissionRequest…

TokenStore

Callback REST

Browser

Box-Domino 3-legged OAuth Dance

Box Servers

Web ApplicationDomino Server

TokenStore

Callback REST

Login Page

0.ClientIdisneededforinitiation

1.RedirectUsertotheLoginPage

3.BoxIssuesaGETRequestwithatemporaryAuthenticationCode

GET

2.UserAcceptedthePermissionRequest…

Browser

Box-Domino 3-legged OAuth Dance

Box Servers

Web ApplicationDomino Server

TokenStore

Callback REST

Login Page

0.ClientIdisneededforinitiation

1.RedirectUsertotheLoginPage

3.BoxIssuesaGETRequestwithatemporaryAuthenticationCode4.WeIssueaPOSTRequestwithClientSecret+AuthenticationCode

GET

2.UserAcceptedthePermissionRequest…

POST

Browser

Box-Domino 3-legged OAuth Dance

Box Servers

Web ApplicationDomino Server

TokenStore

Callback REST

Login Page

0.ClientIdisneededforinitiation

1.RedirectUsertotheLoginPage

3.BoxIssuesaGETRequestwithatemporaryAuthenticationCode4.WeIssueaPOSTRequestwithClientSecret+AuthenticationCode5.BoxrespondswithtokensAccessToken+RefreshToken

GET

2.UserAcceptedthePermissionRequest…

POST

RES

PON

SE

Browser

Box-Domino 3-legged OAuth Dance

Box Servers

Web ApplicationDomino Server

TokenStore

Callback REST

6.SaveTokens

7.DONE!

Login Page

0.ClientIdisneededforinitiation

1.RedirectUsertotheLoginPage

4.BoxIssuesaGETRequestwithatemporaryAuthenticationCode5.WeIssueaPOSTRequestwithClientSecret+AuthenticationCode6.BoxrespondswithtokensAccessToken+RefreshToken

GET

2.UserAcceptedthePermissionRequest…

POST

RES

PON

SE

Now,wecanactonbehalfoftheuser…

Some Tweaks• SSL Issue

• TLS 1.2 is required in most cases.

• Technote: https://www-01.ibm.com/support/docview.wss?uid=swg21985289

• HTTP Proxy/Gateway• Proxy through the Domino Server for CSJS requests (Mostly for security reasons)

• Options

• IBM Domino provides HTTP-proxy servlet

• Programmatically create a gateway using “Remote Service” component

• Testing• REST service: Postman (Chrome Plugin / Standalone)

• REST consumer: MockBin RequestBin httpbin

Wrap-up

SummaryRESTful Services Architecture

Providing and Consuming RESTful services for Domino ApplicationsScenarios around RESTful Services

Architecture Examples

TakeawayDownload and play with demos

Experiment simple servicesGet yourself familiar with RESTful Services

Download OpenNTF projectsStudy on RESTful design practices

Have a Pet Project

Notices and disclaimers

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Resources• Serdar Başeğmez: Demo for this session

https://github.com/sbasegmez/IC17RestDemo

• Serdar Başeğmez: Apache Wink Template and Demo https://github.com/sbasegmez/RestAssuredDemo

• Serdar Başeğmez: Box - SBT Demo https://github.com/sbasegmez/Blogged/tree/master/CloudFile

• Graham Acres / Serdar Başeğmez: The Journey to Becoming a Social Application Developer (IBM Connect 2014)https://speakerdeck.com/sbasegmez/bp308-the-journey-to-becoming-a-social-application-developer

• Stephan H. Wissel: Custom REST service in XPages using a service bean https://wissel.net/blog/d6plinks/SHWL-9Q55QL

• John Dalsgaard: REST Services in IBM Domino/XWorkhttps://www.dalsgaard-data.eu/blog/rest-services-in-ibm-dominoxwork

Resources (cont.)• Eric McCormick: Series on JSON Data with Java in XPages

https://edm00se.io/json-with-java-in-xpages

• Thomas Ladehoff: REST Services with the XPages Extension Libraryhttps://www.assono.de/blog/d6plinks/REST-Services-with-the-XPages-Extension-Library

• Paul Withers: XPages OSGi Plugins serieshttp://www.intec.co.uk/xpages-osgi-plugins-1-an-introduction/

• John Cooper: Domino OSGI (Part 1) - Configuring Eclipse for XPages OSGI Pluginshttp://developmentblog.johnmcooper.co.uk/2014/05/configuring-eclipse-for-xpages-osgi-plugins-part1.html

• Toby Samples: JAX-RS or THE way to do REST in Domino serieshttps://tobysamples.wordpress.com/2015/04/28/jax-rs-or-the-way-to-do-rest-in-domino-part-1/

• Jesse Gallagher: Eclipse Tutorial for Domino Developershttps://github.com/jesse-gallagher/eclipse-tutorial-oct2015/wiki/Java

Thank youSerdar Basegmez

@serdar_basegmez http://lotusnotus.com