Welcome!

Java IoT Authors: Zakia Bouachraoui, Pat Romanski, Elizabeth White, Liz McMillan, Yeshim Deniz

Related Topics: Java IoT, Microservices Expo

Java IoT: Blog Feed Post

REST JSON to SOAP Conversion Tutorial

Imagine the geoloc web service for recording geographical locations

I often get asked about ‘REST to SOAP’ transformation use cases these days. Using an SOA gateway like SecureSpan to perform this type of transformation at runtime is trivial to setup. With SecureSpan in front of any existing web service (in the DMZ for example), you can virtualize a REST version of this same service. Using an example, here is a description of the steps to perform this conversion.

Imagine the geoloc web service for recording geographical locations. It has two methods, one for setting a location and one for getting a location. See below what this would look like in SOAP.

Request:

<?xml version="1.0" encoding="UTF-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<soapenv:Body>
<geo:getPosition xmlns:geo="http://test.layer7tech.com/geolocws">
<geo:trackerId>34802398402</geo:trackerId>
</geo:getPosition>
</soapenv:Body>
</soapenv:Envelope>

Response:

<?xml version="1.0" encoding="UTF-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<soapenv:Body>
<geo:getPositionRes xmlns:geo="http://test.layer7tech.com/geolocws">
<geo:latitude>52.37706</geo:latitude>
<geo:longitude>4.889721</geo:longitude>
</geo:getPositionRes>
</soapenv:Body>
</soapenv:Envelope>

Request:

<?xml version="1.0" encoding="UTF-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<soapenv:Body>
<geo:setPosition xmlns:geo="http://test.layer7tech.com/geolocws">
<geo:trackerId>34802398402</geo:trackerId>
<geo:latitude>52.37706</geo:latitude>
<geo:longitude>4.889721</geo:longitude>
</geo:setPosition>
</soapenv:Body>
</soapenv:Envelope>

Response:

<?xml version="1.0" encoding="UTF-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<soapenv:Body>
<geo:setPositionRes xmlns:geo="http://test.layer7tech.com/geolocws">OK</geo:setPositionRes>
</soapenv:Body>
</soapenv:Envelope>

Here is the equivalent REST target that I want to support at the edge. Payloads could be XML, but let’s use JSON to make it more interesting.

GET /position/34802398402

HTTP 200 OK
Content-Type: text/json

{
'latitude' : 52.37706
'longitude' : 4.889721
}
POST /position/34802398402
Content-Type: text/json

{
'latitude' : 52.37706
'longitude' : 4.889721
}

HTTP 200 OK

OK

Now let’s implement this REST version of the service using SecureSpan. I’m assuming that you already have a SecureSpan Gateway deployed between the potential REST requesters and the existing SOAP web service.

First, I will create a new service endpoint on the gateway for this service and assign anything that comes at the URI pattern /position/* to this service. I will also allow the HTTP verbs GET and POST for this service.

REST geoloc service properties

Next, let’s isolate the resource id from the URI and save this as a context variable named ‘trackerid’. We can use a simple regex assertion to accomplish this. Also, I will branch on the incoming HTTP verb using an OR statement. I am just focusing on GET and POST for this example but you could add additional logic for other HTTP verbs that you want to support for this REST service.

Regex for REST service resource identification

Policy branching for GET vs POST

For GET requests, the transformation is very simple, we just declare a message variable using a SOAP skeleton into which we refer to the trackerid variable.

SOAP request template

This soap message is routed to the existing web service and the essential elements are isolated using XPath assertions.

Processing SOAP response

The REST response is then constructed back using a template response.

Template JSON response

A similar logic is performed for the POST message. See below for the full policy logic.

Complete policy

You’re done for virtualizing the REST service. Setting this up with SecureSpan took less than an hour, did not require any change on the existing SOAP web service and did not require the deployment of an additional component. From there, you would probably enrich the policy to perform some JSON schema validation, some URL and query parameter validation, perhaps some authentication, authorization, etc.

Read the original blog entry...

More Stories By Francois Lascelles

As Layer 7’s Chief Architect, Francois Lascelles guides the solutions architecture team and aligns product evolution with field trends. Francois joined Layer 7 in the company’s infancy – contributing as the first developer and designing the foundation of Layer 7’s Gateway technology. Now in a field-facing role, Francois helps enterprise architects apply the latest standards and patterns. Francois is a regular blogger and speaker and is also co-author of Service-Oriented Infrastructure: On-Premise and in the Cloud, published by Prentice Hall. Francois holds a Bachelor of Engineering degree from Ecole Polytechnique de Montreal and a black belt in OAuth. Follow Francois on Twitter: @flascelles

IoT & Smart Cities Stories
Moroccanoil®, the global leader in oil-infused beauty, is thrilled to announce the NEW Moroccanoil Color Depositing Masks, a collection of dual-benefit hair masks that deposit pure pigments while providing the treatment benefits of a deep conditioning mask. The collection consists of seven curated shades for commitment-free, beautifully-colored hair that looks and feels healthy.
The textured-hair category is inarguably the hottest in the haircare space today. This has been driven by the proliferation of founder brands started by curly and coily consumers and savvy consumers who increasingly want products specifically for their texture type. This trend is underscored by the latest insights from NaturallyCurly's 2018 TextureTrends report, released today. According to the 2018 TextureTrends Report, more than 80 percent of women with curly and coily hair say they purcha...
The textured-hair category is inarguably the hottest in the haircare space today. This has been driven by the proliferation of founder brands started by curly and coily consumers and savvy consumers who increasingly want products specifically for their texture type. This trend is underscored by the latest insights from NaturallyCurly's 2018 TextureTrends report, released today. According to the 2018 TextureTrends Report, more than 80 percent of women with curly and coily hair say they purcha...
We all love the many benefits of natural plant oils, used as a deap treatment before shampooing, at home or at the beach, but is there an all-in-one solution for everyday intensive nutrition and modern styling?I am passionate about the benefits of natural extracts with tried-and-tested results, which I have used to develop my own brand (lemon for its acid ph, wheat germ for its fortifying action…). I wanted a product which combined caring and styling effects, and which could be used after shampo...
The platform combines the strengths of Singtel's extensive, intelligent network capabilities with Microsoft's cloud expertise to create a unique solution that sets new standards for IoT applications," said Mr Diomedes Kastanis, Head of IoT at Singtel. "Our solution provides speed, transparency and flexibility, paving the way for a more pervasive use of IoT to accelerate enterprises' digitalisation efforts. AI-powered intelligent connectivity over Microsoft Azure will be the fastest connected pat...
There are many examples of disruption in consumer space – Uber disrupting the cab industry, Airbnb disrupting the hospitality industry and so on; but have you wondered who is disrupting support and operations? AISERA helps make businesses and customers successful by offering consumer-like user experience for support and operations. We have built the world’s first AI-driven IT / HR / Cloud / Customer Support and Operations solution.
Codete accelerates their clients growth through technological expertise and experience. Codite team works with organizations to meet the challenges that digitalization presents. Their clients include digital start-ups as well as established enterprises in the IT industry. To stay competitive in a highly innovative IT industry, strong R&D departments and bold spin-off initiatives is a must. Codete Data Science and Software Architects teams help corporate clients to stay up to date with the mod...
At CloudEXPO Silicon Valley, June 24-26, 2019, Digital Transformation (DX) is a major focus with expanded DevOpsSUMMIT and FinTechEXPO programs within the DXWorldEXPO agenda. Successful transformation requires a laser focus on being data-driven and on using all the tools available that enable transformation if they plan to survive over the long term. A total of 88% of Fortune 500 companies from a generation ago are now out of business. Only 12% still survive. Similar percentages are found throug...
Druva is the global leader in Cloud Data Protection and Management, delivering the industry's first data management-as-a-service solution that aggregates data from endpoints, servers and cloud applications and leverages the public cloud to offer a single pane of glass to enable data protection, governance and intelligence-dramatically increasing the availability and visibility of business critical information, while reducing the risk, cost and complexity of managing and protecting it. Druva's...
BMC has unmatched experience in IT management, supporting 92 of the Forbes Global 100, and earning recognition as an ITSM Gartner Magic Quadrant Leader for five years running. Our solutions offer speed, agility, and efficiency to tackle business challenges in the areas of service management, automation, operations, and the mainframe.