# NAME

Web::API::Mapper - [Web::API::Mapper](http://search.cpan.org/perldoc?Web::API::Mapper) is an API (Application Programming Interface) convergence class for mapping/dispatching 
API to web frameworks.

# SYNOPSIS

    package YourService;
    use Any::Moose;

    sub route { {
        post => [
            '/bar/(\d+)' => sub { my $args = shift;  return $1;  }
        ]
        get =>  [ 
            ....
        ]
    } }

    package main;

    my $service = YourService->new;
    my $serviceA = OtherService->new;
    $service->connect( ... );

    my $m = Web::API::Mapper->new
            ->mount( '/foo' => $service->route )
            ->mount( '/a' => $serviceA->route );

    my $ret = $m->post->dispatch( '/foo/bar' , { ... args ... } );
    my $ret = $m->get->dispatch(  '/foo/bar' );
    my $ret = $m->dispatch( '/foo/bar' , { args ... } );

    $m->post->mount( '/foo' , [ '/subpath/to' => sub {  ....  } ]);
    $m->mount( '/fb' => {  post => [  ... ] , get => [  ... ] }  )->mount( ... );



# DESCRIPTION

[Web::API::Mapper](http://search.cpan.org/perldoc?Web::API::Mapper) is an API (Application Programming Interface) convergence class for mapping/dispatching 
API to web frameworks.

This module is for reducing class coupling of web services on web frameworks.

Web frameworks are always changing, and one day you will need to migrate your code to 
the latest web framework. If your code heavily depends on your framework,
it's pretty hard to migrate and it takes time.

by using [Web::API::Mapper](http://search.cpan.org/perldoc?Web::API::Mapper) you can simply seperate service application and framework.
you can simply mount these api service like Twitter ... etc, and dispatch paths
to these services.

[Web::API::Mapper](http://search.cpan.org/perldoc?Web::API::Mapper) is using [Path::Dispatcher](http://search.cpan.org/perldoc?Path::Dispatcher) for dispatching.

# TODO

- Provide service classes for mounting.

- Provide mounter for web frameworks.

# ROUTE SPEC

API Provider can provide a route hash reference for dispatching rules.

- post => [ '/path/to/(\d+)' => sub {  } , ... ]

- get => [  '/path/to/(\d+)' => sub {  } , ... ]

- fallback => sub {    }

# ACCESSORS

## route

## post

is a [Web::API::Mapper::RuleSet](http://search.cpan.org/perldoc?Web::API::Mapper::RuleSet) object.

## get

is a [Web::API::Mapper::RuleSet](http://search.cpan.org/perldoc?Web::API::Mapper::RuleSet) object.

## fallback

is a CodeRef, fallback handler.

# FUNCTIONS

## mount

## dispatch

## auto_route( Class|Object $api , HashRef $options  )

Auto generate API routing table for object|class.

You can use `prefix` or `regexp` to filter methods.

underscores will be translated to slash `/`. for example, foo_get_id will be /get/id.

### Options

- prefix => qq|prefix_|

Get methods by prefix, and strip the prefix.

- regexp => qr/.../

Filter methods by a regular expression pattern.

- type => post|get|any

Handler type, can be `post`, `get` and `any`.

# EXAMPLE

    package Twitter::API;

    sub route { {
        post => [
            '/timeline/add/' => sub { my $args = shift;  .... },
            '/timeline/remove/' => sub { ... },
        ],
        get => [
            '/timeline/get/(\w+)' => sub {  my $args = shift;  .... return $1 },
        ],
    } }

    package main;

    # This will add rule path to /twitter/timeline/add/  ... etc
    my $m = Web::API::Mapper->new( '/twitter' => Twitter::API->route );
    $m->mount(  '/basepath' , {  post => [  ... ] } );
    $m->post->mount( '/basepath' , [  ...  ]  );
    $m->dispatch( '/path/to' , { args ... } );

    1;

For example, if you are in Dancer:

    #!/usr/bin/perl
    use Dancer;
    use JSON;

    our $m = Web::API::Mapper->new
        ->mount( '/twitter' => Twitter::API->route )
        ->mount( '/basepath' , { post => [  ... ] } );

    any '/api/*' => sub {
        return encode_json( $m->dispatch( $1 , params ) );
    };

    # request for '/api/twitter/timeline/add' to run!

    dance;

And one day you want another applciation in Mojo:

    use Mojolicious::Lite;
    get '/api/*' => sub {
        my $self = shift;
        return $self->render(  $m->dispatch( $1 , $self->params ) );
    };
    app->start;

# AUTHOR

Cornelius & cornelius.howl at gmail.com ;

# LICENSE

Perl