=encoding utf-8

=head1 NAME

Spore (Specifications to a POrtable Rest Environment) Description Implementation

=head1 ABSTRACT

Spore is a specification for describing ReST API that can be parsed and used
automatically by client implementations to communicate with the descibed API.

This document describes how to write the description for a ReST API in
order to be used with a SPORE Client Implementation.

=head1 TERMINOLOGY

=over 4

=item API

An I<API> is a ReST application that can exchange data with client
applications over http/https. It presents one or more method endpoints which
accept http requests with varying headers, parameters and body content to
perform specific operations.

=item Client implementation

A I<Client implementation> is a library targeting a specific system or
language. It can use I<Descriptions files> to create programmatic interfaces
usable in applications.

=item Description file

A I<Description file> is a file in JSON format describing an I<API> (see
specification). It can directly be used by a  I<Client implementation> to
create a programmatic interface in the target system.

=back

=head1 API DESCRIPTION

An API should provide a description file. The description should be in JSON
format.

=head2 GENERIC DESCRIPTION

This part describes the API itself:

=over 4

=item B<name> (required)

A simple name to describe the specification

    name: CouchDB

=item B<authority> (optional)

The authority of the description

    authorithy: GITHUB:franckcuny

=item B<base_url> (optional)

If the API has a fixed URL

    base_url: http://api.twitter.com/1/

=item B<formats> (optional)

A list of supported format

    formats:
      - json
      - xml

=item B<version> (required)

The version number of the current description

    version: 0.1

=item B<api_authentication> (optional)

A boolean to specify if this API requires authentication for all the methods

    authentication: true

=item B<methods> (required)

A list of methods

=back

The desciption B<MUST> contain a list of at least one method

=head2 METHOD DESCRIPTION

A method must have a name:

    public_timeline

=over 4

=item B<method> (required)

An HTTP method

    method: GET

=item B<path> (required)

Path for the given method. The path can contain B<placeholders>. A placeholder
B<MUST> begin with a <:>:

    path: /statuses/public_timeline.:format

=item B<optional_params> (optional)

A list of optional parameters. This list will be used to replace value in placeholders, and if not used in the path, will be added to the query

    optional_params:
      - trim_user
      - include_entities

=item B<required_params> (optional)

A list of required parameters. Parameters that are required B<MUST NOT> be repeated in the B<optional_params> field

    required_params:
      - format

=item B<expected_status> (optional)

A list of accepted HTTP status for this method

    expected_status:
      - 200

=item B<description> (optional)

A simple description for the method. This should not be considered as
documentation.

    description: Returns the 20 most recent statuses, including retweets if they exist, from non-protected users

=item B<authentication> (optional)

A boolean to specify if this method requires authentication

    authentication: false

=item B<base_url> (optional)

Specify an url if this method requires a different api_base_url

    base_url: http://api.twitter.com/1/

=item B<formats> (optional)

A list of supported format

    formats:
      - json
      - xml

=item B<documentation> (optional)

A complete documentation for the given method

    documentation: The public timeline is cached for 60 seconds. Requesting more frequently than that will not return any more data, and will count against your rate limit usage.

=back

=head3 SAMPLE

A description for the twitter API (only the API description part and the first method):

    {
        "base_url" : "http://api.twitter.com/1",
        "version" : "0.1",
        "methods" : {
            "public_timeline" : {
                "optional_params" : [
                    "trim_user",
                    "include_entities"
                ],
                "required_params" : [
                    "format"
                ],
                "path" : "/statuses/public_timeline.:format",
                "method" : "GET"
            }
        }
    }

=head3 CALLS

=head1 CHANGELOGS

0.1: 2010.10.xx

=over 4

=item *

Initial version.

=back

=head1 ACKNOWLEDGEMENTS

Some parts of this specification are adopted from the following specifications.

=over 4

=item *

PSGI Specification L<PSGI|http://search.cpan.org/perldoc?PSGI>

=item *

PEP333 Python Web Server Gateway Interface L<http://www.python.org/dev/peps/pep-0333>

=item *

Rack L<http://rack.rubyforge.org/doc/SPEC.html>

=item *

JSGI Specification L<http://jackjs.org/jsgi-spec.html>

=back

I'd like to thank authors of these great documents.

=head1 AUTHOR

=over 4

=item franck cuny

=item nils grunwald

=back

=head1 CONTRIBUTORS

=over 4

=item damien "bl0b" leroux

=item François Perrad

=back

=head1 COPYRIGHT AND LICENSE

Copyright XXX, 2010.

This document is licensed under the Creative Commons license by-sa.

=cut