package Net::Dropbox::API;

use common::sense;
use File::Basename qw(basename);
use JSON;
use Mouse;
use Net::OAuth;
use LWP::UserAgent;
use URI;
use HTTP::Request::Common;
use Crypt::URandom qw(urandom);
use Encode;

=head1 NAME

Net::Dropbox::API - A dropbox API interface

=head1 VERSION

Version 1.9.8

=cut

our $VERSION = '1.9';


=head1 SYNOPSIS

The Dropbox API is a OAuth based API. I try to abstract as much away as
possible so you should not need to know too much about it.
This is how it works:

    use Net::Dropbox::API;

    my $box = Net::Dropbox::API->new({key => 'KEY', secret => 'SECRET'});
    my $login_link = $box->login;  # user needs to click this link and login
    $box->auth;                    # oauth keys get exchanged
    my $info = $box->account_info; # and here we have our account info

See the examples for a working Mojolicious web client using the Dropbox
API.

You can find Dropbox's API documentation at L<https://www.dropbox.com/developers/web_docs>

=head1 FUNCTIONS

=cut

has 'debug' => (is => 'rw', isa => 'Bool', default => 0);
has 'error' => (is => 'rw', isa => 'Str', predicate => 'has_error');
has 'key' => (is => 'rw', isa => 'Str');
has 'secret' => (is => 'rw', isa => 'Str');
has 'login_link' => (is => 'rw', isa => 'Str');
has 'callback_url' => (is => 'rw', isa => 'Str', default => 'http://localhost:3000/callback');
has 'request_token' => (is => 'rw', isa => 'Str');
has 'request_secret' => (is => 'rw', isa => 'Str');
has 'access_token' => (is => 'rw', isa => 'Str');
has 'access_secret' => (is => 'rw', isa => 'Str');
has 'context' => (is => 'rw', isa => 'Str', default => 'sandbox');


=head2 login

This sets up the initial OAuth handshake and returns the login URL. This
URL has to be clicked by the user and the user then has to accept
the application in dropbox. 

Dropbox then redirects back to the callback URL defined with
C<$self-E<gt>callback_url>. If the user already accepted the application the
redirect may happen without the user actually clicking anywhere.

=cut

sub login {
    my $self = shift;

    my $ua = LWP::UserAgent->new;

    my $request = Net::OAuth->request("request token")->new(
        consumer_key => $self->key,
        consumer_secret => $self->secret,
        request_url => 'https://api.dropbox.com/1/oauth/request_token',
        request_method => 'POST',
        signature_method => 'HMAC-SHA1',
        timestamp => time,
        nonce => $self->nonce,
        callback => $self->callback_url,
        callback_confirmed => ($self->callback_url ? 'true' : undef)
    );

    $request->sign;
    my $res = $ua->request(POST $request->to_url);

    if ($res->is_success) {
        my $response = Net::OAuth->response('request token')->from_post_body($res->content);
        $self->request_token($response->token);
        $self->request_secret($response->token_secret);
        print "Got Request Token ", $response->token, "\n" if $self->debug;
        print "Got Request Token Secret ", $response->token_secret, "\n" if $self->debug;
        return 'https://www.dropbox.com/1/oauth/authorize?oauth_token='.$response->token.'&oauth_callback='.$self->callback_url;
    }
    else {
        $self->error($res->status_line);
        warn "Something went wrong: " . $res->status_line;
    }
}

=head2 auth

The auth method changes the initial request token into access token that we need
for subsequent access to the API. This method only has to be called once
after login.

=cut

sub auth {
    my $self = shift;

    my $ua = LWP::UserAgent->new;
    my $request = Net::OAuth->request("access token")->new(
        consumer_key => $self->key,
        consumer_secret => $self->secret,
        request_url => 'https://api.dropbox.com/1/oauth/access_token',
        request_method => 'POST',
        signature_method => 'HMAC-SHA1',
        timestamp => time,
        nonce => $self->nonce,
        callback => $self->callback_url,
        token => $self->request_token,
        token_secret => $self->request_secret,
    );

    $request->sign;
    my $res = $ua->request(POST $request->to_url);

    if ($res->is_success) {
        my $response = Net::OAuth->response('access token')->from_post_body($res->content);
        $self->access_token($response->token);
        $self->access_secret($response->token_secret);
        print "Got Access Token ", $response->token, "\n" if $self->debug;
        print "Got Access Token Secret ", $response->token_secret, "\n" if $self->debug;
    }
    else {
        $self->error($res->status_line);
        warn "Something went wrong: ".$res->status_line;
    }
}

=head2 account_info

account_info polls the users info from dropbox.

=cut

sub account_info {
    my $self = shift;

    return from_json($self->_talk('account/info'));
}

=head2 list

lists all files in the path defined:

    $data = $box->list();           # top-level
    $data = $box->list( "/Photos" ); # folder

The data returned is a ref to a hash containing various fields returned
by Dropbox, including a C<hash> value, which can be used later to check
if Dropbox data beneath a specified folder has changed since the last call.

For this, C<list()> accepts an optional 'hash' argument:

    $data = $box->list({ hash => "ce9ccbfb8f255f234c93adcfef33b5a6" },
                       "/Photos");

This will either return

    { http_response_code => 304 }

in which case nothing has changed since the last call, or 

    { http_response_code => 200,
      # ... various other fields
    }

if there were modifications.

=cut

sub list {
    my $self = shift;
    my $opts = {};
    if(defined $_[0]  and ref($_[0]) eq "HASH") {
          # optional option hash present
        $opts = shift;
    }
    my $path = shift;
    $path = '' unless defined $path;
    $path = '/'.$path if $path=~m|^[^/]|;

    my $uri = URI->new('files/'.$self->context.$path);
    $uri->query_form($opts) if scalar keys %$opts;

    my $talk_opts = {};

    if(exists $opts->{hash}) {
       $talk_opts = {
           error_handler => sub {
               my $obj   = shift;
               my $resp  = shift;
               # HTTP::Status is nice but old RHEL5 has issues with it
               # so we use plain codes
               if( $resp->code == 304 ) {
                   return to_json({ http_response_code => 304 });
               } else {
                   return $self->_talk_default_error_handler($resp);
               }
           },
       };
    }

    return from_json($self->_talk($talk_opts, $uri->as_string));
}

=head2 copy

copies a folder
    copy($from, $to)

=cut

sub copy {
    my $self = shift;
    my ($from, $to) = @_;

    my $opts = 'root='.$self->context;
    return from_json($self->_talk('fileops/copy?'.$opts,
                    undef, undef, undef, undef, undef,
                    { from_path => $from, to_path => $to }));
}

=head2 move

move a folder
    move($from, $to)

=cut

sub move {
    my $self = shift;
    my ($from, $to) = @_;

    my $opts = 'root='.$self->context;
    return from_json($self->_talk('fileops/move?'.$opts,
                    undef, undef, undef, undef, undef,
                    { from_path => $from, to_path => $to }));
}

=head2 mkdir

creates a folder
    mkdir($path)

=cut

sub mkdir {
    my $self = shift;
    my ($path) = @_;

    my $opts = 'root='.$self->context;
    return from_json($self->_talk('fileops/create_folder?'.$opts,
                    undef, undef, undef, undef, undef,
                    { path => $path }));
}

=head2 delete

delete a folder
    delete($path)

=cut

sub delete {
    my $self = shift;
    my ($path) = @_;

    my $opts = 'root='.$self->context;
    return from_json($self->_talk('fileops/delete?'.$opts,
                    undef, undef, undef, undef, undef,
                    { path => $path }));
}

=head2 view

creates a cookie protected link for the user to look at.
    view($path)

=cut

sub view {
    my $self = shift;
    my ($path) = @_;

    return from_json($self->_talk('fileops/links/'.$self->context.'/'.$path));
}

=head2 metadata

creates a cookie protected link for the user to look at.
    metadata($path)

=cut

sub metadata {
    my $self = shift;
    my $path = shift || '';

    return from_json($self->_talk('metadata/'.$self->context.'/'.$path));
}

=head2 putfile

uploads a file to dropbox

=cut

sub putfile {
    my $self     = shift;
    my $file     = shift;
    my $path     = shift || '';
    my $filename = shift || basename( $file );

    return from_json(
        $self->_talk(
            'files/'.$self->context.'/'.$path,
            'POST',
            { file => [ $file ] },
            $filename, # can't decode_utf8
            'api-content',
            undef,
            { file => decode_utf8($filename) }
        )
    );

}

=head2 getfile

get a file from dropbox

=cut

=head2 debug

Set this to a non-false value in order to print some debugging information to STDOUT.
    debug(1)

=cut

sub getfile {
    my $self = shift;
    my $path = shift || '';
    my $file = shift || '';

    return $self->_talk('files/'.$self->context.'/'.$path, undef, undef, undef, 'api-content', $file);
}


=head1 INTERNAL API

=head2 _talk

_talk handles the access to the restricted resources. You should
normally not need to access this directly.

=cut

=head2 nonce

Generate a different nonce for every request.

=cut

sub nonce { unpack("H*", urandom(8)); }

sub _talk {
    my $self    = shift;
    my $opts    = {};
    if(defined $_[0]  and ref($_[0]) eq "HASH") {
          # optional option hash present
        $opts = shift;
    }
    my $command = shift;
    my $method  = shift || 'GET';
    my $content = shift;
    my $filename= shift;
    my $api     = shift || 'api';
    my $content_file = shift;
    my $extra_params = shift;

    if( !defined $opts->{error_handler} ) {
        $opts->{error_handler} = \&_talk_default_error_handler;
    }

    my $ua = LWP::UserAgent->new;

    my %opts = (
        consumer_key => $self->key,
        consumer_secret => $self->secret,
        request_url => 'https://'.$api.'.dropbox.com/1/'.$command,
        request_method => $method,
        signature_method => 'HMAC-SHA1',
        timestamp => time,
        nonce => $self->nonce,
        #callback => $self->callback_url,
        token => $self->access_token,
        token_secret => $self->access_secret,
        extra_params => $extra_params
    );
    if($filename) {
        push @{$content->{file}},$filename;
    }

    my $request = Net::OAuth->request("protected resource")->new( %opts );

    $request->sign;
    print "_talk URL: ", $request->to_url, "\n" if $self->debug;

    my $res;
    if($content_file) {
        $res = $ua->get($request->to_url, ':content_file' => $content_file);
    } elsif($method =~ /get/i){
        $res = $ua->get($request->to_url);
    } else {
        $res = $ua->post($request->to_url, Content_Type => 'form-data', Content => $content );
    }

    if ($res->is_success) {
        print "Got Content ", $res->content, "\n" if $self->debug;
        my $data;
        eval {
            $data = from_json($res->content);
        };
        if($@) {
            # this doesn't look like JSON, might be file content
            return $res->content;
        }
        $data->{http_response_code} = $res->code();
        return to_json($data);
    } else {
        $self->error($res->status_line);
        return $opts->{error_handler}->($self, $res);
    }
    return;
}

sub _talk_default_error_handler {
    my $self    = shift;
    my $res     = shift;

    warn "Something went wrong: ".$res->status_line;
    return to_json({error => $res->status_line,
                    http_response_code => $res->code});
}

=head1 AUTHOR

Lenz Gschwendtner, C<< <norbu09 at cpan.org> >>

With Bug fixes from:

Greg Knauss C<< gknauss at eod.com >>

Chris Prather C<< chris at prather.org >>

Shinichiro Aska

[ktdreyer]

SureVoIP L<http://www.surevoip.co.uk>

=head1 BUGS

Please report any bugs through the web interface at
L<https://github.com/norbu09/Net--Dropbox/issues>.  I will be notified, and then you'll
automatically be notified of progress on your bug as I make changes.

=head1 SUPPORT

You can find documentation for this module with the perldoc command.

    perldoc Net::Dropbox::API

You can also look for information at:

=over 4

=item * AnnoCPAN: Annotated CPAN documentation

L<http://annocpan.org/dist/Net-Dropbox-API>

=item * CPAN Ratings

L<http://cpanratings.perl.org/d/Net-Dropbox-API>

=item * Search CPAN

L<http://search.cpan.org/dist/Net-Dropbox-API/>

=back


=head1 COPYRIGHT & LICENSE

Copyright 2010 Lenz Gschwendtner.

This program is free software; you can redistribute it and/or modify it
under the terms of either: the GNU General Public License as published
by the Free Software Foundation; or the Artistic License.

See http://dev.perl.org/licenses/ for more information.


=cut

1; # End of Net::Dropbox