NAME

LINE::Bot::API - SDK of the LINE Messaging API for Perl

SYNOPSIS

# in the synopsis.psgi
use strict;
use warnings;
use LINE::Bot::API;
use LINE::Bot::API::Builder::SendMessage;
use Plack::Request;

my $bot = LINE::Bot::API->new(
    channel_secret       => $channel_secret,
    channel_access_token => $channel_access_token,
);

sub {
    my $req = Plack::Request->new(shift);

    unless ($req->method eq 'POST' && $req->path eq '/callback') {
        return [200, [], ['Not Found']];
    }

    unless ($bot->validate_signature($req->content, $req->header('X-Line-Signature'))) {
        return [200, [], ['failed to validate signature']];
    }

    my $events = $bot->parse_events_from_json($req->content);
    for my $event (@{ $events }) {
        next unless $event->is_message_event && $event->is_text_message;

        my $messages = LINE::Bot::API::Builder::SendMessage->new;
        $messages->add_text( text => $event->text );
        $bot->reply_message($event->reply_token, $messages->build);
    }

    return [200, [], ["OK"]];
};

DESCRIPTION

LINE::Bot::API is a client library which lets you easily start using the LINE Messaging API. You can create a bot which runs on the LINE app by registering for a LINE Messaging API account. You can create a Messaging API account from the LINE Business Center.

You can find the Channel secret and Channel access token on the Basic information page on the Channel Console which you can access from the LINE Business Center.

Use this documentation and the LINE Developers documentation to get you started developing your own bot!

METHODS

new(%args)

Create a new LINE::Bot::API instance.

 my $bot = LINE::Bot::API->new(
    channel_secret       => $channel_secret,
    channel_access_token => $channel_access_token,
);

reply_message($reply_token, [ $message, ... ] )

Send reply messages to a user, room or group.

my $messages = LINE::Bot::API::Builder::SendMessage->new;
$messages->add_text( text => 'Example reply text' );

my $ret = $bot->reply_message($reply_token, $messages->build);
unless ($ret->is_success) {
    # error
    warn $ret->message;
    for my $detail (@{ $res->details // []}) {
        warn "    detail: " . $detail->{message};
    }
}

You can get a reply_token from a webhook event object. See the documentation for the parse_events_from_json($json) method.

You can also see the online API reference documentation. https://devdocs.line.me/#reply-message

push_message($user_id|$room_id|$group_id, [ $message, ... ])

Send push messages to a user, room or group.

my $messages = LINE::Bot::API::Builder::SendMessage->new;
$messages->add_text( text => 'Example push text' );
$bot->push_message($user_id, $messages->build);

You can get a user_id, room_id or group_id from a webhook event object. See the documentation for the parse_events_from_json($json) method.

You can also see the online API reference documentation. https://devdocs.line.me/#push-message

multicast([$user_id, ... ], [ $message, ... ])

Send push messages to multiple users.

my $messages = LINE::Bot::API::Builder::SendMessage->new;
$messages->add_text( text => 'Example push text' );
$bot->multicast([ $user_id ], $messages->build);

You can get a user_id from a webhook event object. See the documentation for the parse_events_from_json($json) method.

You can also see the online API reference documentation. https://devdocs.line.me/#multicast

validate_signature($json, $signature)

my $req = Plack::Request->new( ... );
unless ($bot->validate_signature($req->content, $req->header('X-Line-Signature'))) {
    die 'failed to signature validation';
}

parse_events_from_json($json)

Parse webhook event objects and build LINE::Bot::API::Event instances.

my $req = Plack::Request->new( ... );
my $events = $bot->parse_events_from_json($req->content);
for my $event (@{ $events }) {
    unless ($event->is_unfollow_event && $event->is_leave_event) {
        # Get a reply_token
        my $reply_token = $event->reply_token;
    }
    if ($event->is_user_event) {
        # Get a user_id
        my $user_id = $event->user_id;
    }
    if ($event->is_room_event) {
        # Get a room_id
        my $room_id = $event->room_id;
    }
    if ($event->is_group_event) {
        # Get a group_id
        my $group_id = $event->group_id;
    }

    if ($event->is_message_event) {
        # Get a message id
        my $message_id = $event->message_id;
    }
}

leave_room($room_id)

Bot leaves a room.

$bot->leave_room($room_id);

You can get a room_id by a Webhook Event Object. And see also parse_events_from_json($json) method's document.

leave_group($group_id)

Bot leaves a group.

$bot->leave_group($group_id);

You can get a group_id from a webhook event object. See the documentation for the parse_events_from_json($json) method.

get_message_content($message_id)

Get the original file which was sent by user.

my $ret = $bot->get_message_content($message_id);
if ($ret->is_success) {
    my $filename = $ret->fh->filename;
    open my $fh, '<', $file or die "$!: $file";
    ...
}

You can get a message_id from a webhook event object. See the documentation for the parse_events_from_json($json) method.

You can also see the online API reference documentation. https://devdocs.line.me/#get-content

get_profile($user_id)

Get user profile information.

my $res = $bot->get_profile($user_id);
if ($ret->is_success) {
    say $ret->display_name;
    say $ret->user_id;
    say $ret->picture_url;
    say $ret->status_message;
}

See the online API reference documentation. https://devdocs.line.me/#bot-api-get-profile

How to build a send message object

When the LINE::Bot::API::Builder::SendMessage class is used, it is possible easily to build a send message object. That class supports a fluent interface.

my $messages = LINE::Bot::API::Builder::SendMessage->new(
)->add_text(
    text => 'Closing the distance',
)->add_image(
    image_url   => 'http://example.com/image.jpg',
    preview_url => 'http://example.com/image_preview.jpg',
);
$bot->reply_message($reply_token, $messages->build);

See the online API reference documentation. https://devdocs.line.me/#send-message-object

Text type

Build a text type object.

my $messages = LINE::Bot::API::Builder::SendMessage->new(
)->add_text(
    text => 'Closing the distance',
);
$bot->reply_message($reply_token, $messages->build);

Image type

Build an image type object.

my $messages = LINE::Bot::API::Builder::SendMessage->new(
)->add_image(
    image_url   => 'http://example.com/image.jpg',
    preview_url => 'http://example.com/image_preview.jpg',
);
$bot->reply_message($reply_token, $messages->build);

Video type

Build a video type object.

my $messages = LINE::Bot::API::Builder::SendMessage->new(
)->add_video(
    video_url   => 'http://example.com/video.mp4',
    preview_url => 'http://example.com/video_preview.jpg',
);
$bot->reply_message($reply_token, $messages->build);

Audio type

Build an audio type object.

my $messages = LINE::Bot::API::Builder::SendMessage->new(
)->add_audio(
    audio_url => 'http://example.com/image.m4a',
    duration  => 3601_000, # msec
);
$bot->reply_message($reply_token, $messages->build);

Location type

Build a location type object.

my $messages = LINE::Bot::API::Builder::SendMessage->new(
)->add_location(
    title     => 'LINE Corporation.',
    address   => 'Hikarie  Shibuya-ku Tokyo 151-0002',
    latitude  => 35.6591,
    longitude => 139.7040,
);
$bot->reply_message($reply_token, $messages->build);

Sticker type

Build a sticker type object.

my $messages = LINE::Bot::API::Builder::SendMessage->new(
)->add_sticker(
    package_id => '1',
    sticker_id => '2',
);
$bot->reply_message($reply_token, $messages->build);

Imagemap type

Build an imagemap type object. You can use a helper module for the imagemap type.

my $imagemap = LINE::Bot::API::Builder::ImagemapMessage->new(
    base_url    => 'https://example.com/bot/images/rm001',
    alt_text    => 'this is an imagemap',
    base_width  => 1040,
    base_height => 1040,
)->add_uri_action(
    uri         => 'http://example.com/',
    area_x      => 0,
    area_y      => 0,
    area_width  => 1040,
    area_height => 520,
)->add_message_action(
    text        => 'message',
    area_x      => 0,
    area_y      => 520,
    area_width  => 1040,
    area_height => 520,
);

my $messages = LINE::Bot::API::Builder::SendMessage->new(
)->add_imagemap($imagemap->build);
$bot->reply_message($reply_token, $messages->build);

Template type

Build a template type object. You can use a helper module for the template type.

Buttons type

my $buttons = LINE::Bot::API::Builder::TemplateMessage->new_buttons(
    alt_text  => 'this is a buttons template',
    image_url => 'https://example.com/bot/images/image.jpg',
    title     => 'buttons',
    text      => 'description',
)->add_postback_action(
    label => 'postback',
    data  => 'postback data',
    text  => 'postback message',
)->add_message_action(
    label => 'message',
    text  => 'message',
)->add_uri_action(
    label => 'uri',
    uri   => 'http://example.com/',
)->add_message_action(
    label => 'message2',
    text  => 'message2',
);

my $messages = LINE::Bot::API::Builder::SendMessage->new(
)->add_template($buttons->build);
$bot->reply_message($reply_token, $messages->build);

Confirm type

my $confirm = LINE::Bot::API::Builder::TemplateMessage->new_confirm(
    alt_text => 'this is a confirm template',
    text     => 'confirm',
)->add_postback_action(
    label => 'postback',
    data  => 'postback data',
    text  => 'postback message',
)->add_message_action(
    label => 'message',
    text  => 'message',
)->add_uri_action(
    label => 'uri',
    uri   => 'http://example.com/',
);

my $messages = LINE::Bot::API::Builder::SendMessage->new(
)->add_template($confirm->build);
$bot->reply_message($reply_token, $messages->build);

Carousel type

my $carousel = LINE::Bot::API::Builder::TemplateMessage->new_carousel(
    alt_text => 'this is a carousel template',
);
for my $i (1..5) {
    my $column = LINE::Bot::API::Builder::TemplateMessage::Column->new(
        image_url => 'https://example.com/bot/images/item.jpg',
        title     => "carousel $i",
        text      => "description $i",
    )->add_postback_action(
        label => 'postback',
        data  => 'postback data',
        text  => 'postback message',
    )->add_message_action(
        label => 'message',
        text  => 'message',
    )->add_uri_action(
        label => 'uri',
        uri   => 'http://example.com/',
    );
    $carousel->add_column($column->build);
}

my $messages = LINE::Bot::API::Builder::SendMessage->new(
)->add_template($carousel->build);
$bot->reply_message($reply_token, $messages->build);

COPYRIGHT & LICENSE

This Software Development Kit is licensed under The Artistic License 2.0. You may obtain a copy of the License at https://opensource.org/licenses/Artistic-2.0

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