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Table of Contents

Info
titleVersion

This page concerns v2.0 of the Specification. Supporting material on v1.0 is SWIM-SERV-019 Protocols and data format




Requirement

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Title

Service interface protocols and data format

Identifier

SWIM-SERV-260

Requirement

A service description shall include or refer to information about:

  • the service interface protocols (including name and version); and
  • data format to be used.

Rationale

Makes explicit within the service description what the protocols are.

Verification

Completeness: Verify that all relevant protocols and versions are listed; verify that the information is provided for each provider side and consumer side interface.

Consistency: Verify that the protocols are consistent with the selected interface binding.

Correctness: Not Applicable.

Examples/Notes

Note: The list of supported protocols are the ones corresponding to the selected interface binding. The supported versions of the protocols need to be declared. E.g. version of the Transport Level Security (TLS).

Note: Data format examples include XML and JSON.

Level of Implementation

Mandatory


Guidance

Info
titleService Metadata Schema Guidance

The service metadata schema allows flexibility when satisfying this requirement.

  • The service interface protocols are captured as text in the "description" field. This flexible approach was adopted as, in reality, the service interface protocols come in many different forms and a more precise structure in the schema would prove to be too limiting.
  • The data format is captured for each message. This allows a service to provide data in different formats according to the given "schema".

Verification Support

Completeness

Check that:

[  ] The service description includes or refers to information about the service interface protocols (including name and version) for each provider side and consumer side interface.

[  ] The service description includes or refers to information about the data format to be used for each provider side and consumer side interface.

Consistency

Check that:

[  ] The protocols are consistent with the selected interface binding.

Examples

The following example shows the content as a table.

data format

service interface protocols and data format





transport / messaging protocols

HTTP XML 1.1

SOAP1.1, SOAP1.2

Protocol implementation compliant with WSI Basic Profile 2.0

protocol configuration

HTTP Messages will indicate the payload content type using the content-type header

HTTP Messages that transport compressed payloads will use deflate/gzip/exi as expressed in the content-encoding header  (compression ratio is around 20%)

HTTP will use the chunked transfer encoding and indicate this in the transfer-encoding header.

HTTP will use the status header to indicate the status of the response using a code and corresponding meaning phrase. (see exception handling)

HTTP post method is supported

security

Server authentication based on  X.509 certificates

Client authenticates based on HTTP Basic

TLS1.2

Cypher Suites: 0 requests and replies embedded into SOAP 1.2 messages, themselves embedded into HTTP/1.1 requests and responses. Operation names are associated to SOAP requests. The interface does not use compression or message transmission optimization mechanism (MTOM). The following cipher suites are allowed in accordance with ECRYPT-CSA recommendations https://www.ecrypt.eu.org/csa/documents/D5.4-FinalAlgKeySizeProt.pdf: TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_ECDSA_WITH_AES_256_CCM

exception handling

The services make use of the standard HTTP 400 error [Bad Request] in any of the following cases:

  • The request is for an unsupported release
  • The request is not a well-formed XML
  • The request is a well-formed XML but it is not valid with respect to the XSD (i.e. it does not conform to the type and attribute names defined in the XSD and documented in the reference manuals). Examples of causes for invalid XML documents are:
    • Unexpected element or attribute
    • Element order violation
    • Incorrect primitive value
    • Unexpected enum value

_GCM_SHA384.

data format


Info

This is captured in the service messages section. See SWIM-SERV-280 Service messages.



The following example shows an extract of the content of a JSON file that conforms to the Service Metadata Schema

Code Block
languagejs
titleExample of SWIM-SERV-260 using Service Metadata Schema
"serviceInterface": [{
 "serviceInterfaceBinding": {
  ...
  "description": "XML 1.0 requests and replies embedded into SOAP 1.2 messages, themselves embedded into HTTP/1.1 requests and responses. Operation names are associated to SOAP requests. The interface does not use compression or message transmission optimization mechanism (MTOM). The following cipher suites are allowed in accordance with ECRYPT-CSA recommendations https://www.ecrypt.eu.org/csa/documents/D5.4-FinalAlgKeySizeProt.pdf: TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384."
 }
"messages": [{
  ...
  "schema": {
   "url": "https://donlon.eu/schema/1.0.0/tobt/donlon-schema.xsd"
  }
 }
 }]
}]


Complete examples are available at Example service description.