WebServices

1
WebServices

• -Sujeeth Narayan
• -Ankur Patwa

2
Introduction

• A Web service is a software system identified by
  a URI, whose public interfaces and bindings are
  defined and described using XML.
• Its definition can be discovered by other
  software systems. These systems may then interact
  with the Web service in a manner prescribed by
  its definition, using XML based messages conveyed
  by Internet protocols.

3
Protocols/Standards

• XML
• JAX-RPC
• WSDL
• SOAP
• UDDI

4
Web Services Architecture
5
WSDL

• Services are defined using six major elements
• types, which provides data type definitions used
  to describe the messages exchanged.
• message, which represents an abstract definition
  of the data being transmitted. A message consists
  of logical parts, each of which is associated
  with a definition within some type system.
• portType, which is a set of abstract operations.
  Each operation refers to an input message and
  output messages.
• binding, which specifies concrete protocol and
  data format specifications for the operations and
  messages defined by a particular portType.
• port, which specifies an address for a binding,
  thus defining a single communication endpoint.
• service, which is used to aggregate a set of
  related ports.

6
SOAP

• SOAP is a lightweight protocol for exchange of
  information in a decentralized, distributed
  environment. It is an XML based protocol that
  consists of three parts
• an envelope that defines a framework for
  describing what is in a message and how to
  process it
• a set of encoding rules for expressing instances
  of application-defined datatypes
• convention for representing remote procedure
  calls and responses.

7
UDDI

• A directory model for web services.
• UDDI is a platform-independent specification
  using XML for maintaining standardized
  directories of information about web services,
  recording their capabilities, location and
  requirements in a universally recognized format.

8
Project Architecture
9
Security in Web Services

• XML Digital Signature
• XML Encryption
• XML Key Management
• SAML by OASIS Security Services
• OASIS Access Control Markup Language (XACML)
• OASIS Web Services Security

10
Tools

• Bea WebLogic
• A set of tools for developing, integrating,
  deploying and testing web service.
• Sakai Project
• It is collaboration between 4 educational
  institutions developing open-source, re-usable
  components for portals.

11
References

• http//www.w3.org
• http//en.wikipedia.org/wiki/Web_service
• Security
• http//webservices.xml.com/pub/a/ws/2003/03/04/sec
  urity.html
• http//webmail.uccs.edu/Redirect/www.oasis-open.or
  g/committees/download.php/5531/oasis-200401-wss-so
  ap-message-security-1.0.pdf