Mojolicious::Plugin::DefaultHelpers - Default helpers plugin
# Mojolicious $app->plugin('DefaultHelpers'); # Mojolicious::Lite plugin 'DefaultHelpers';
Mojolicious::Plugin::DefaultHelpers is a collection of helpers for Mojolicious.
This is a core plugin, that means it is always enabled and its code a good example for learning to build new plugins, you're welcome to fork it.
See "PLUGINS" in Mojolicious::Plugins for a list of plugins that are available by default.
Mojolicious::Plugin::DefaultHelpers implements the following helpers.
my $formats = $c->accepts; my $format = $c->accepts('html', 'json', 'txt');
Select best possible representation for resource from format GET/POST parameter, format stash value or Accept request header with "accepts" in Mojolicious::Renderer, defaults to returning the first extension if no preference could be detected.
format
GET
POST
Accept
# Check if JSON is acceptable $c->render(json => {hello => 'world'}) if $c->accepts('json'); # Check if JSON was specifically requested $c->render(json => {hello => 'world'}) if $c->accepts('', 'json'); # Unsupported representation $c->render(data => '', status => 204) unless my $format = $c->accepts('html', 'json'); # Detected representations to select from my @formats = @{$c->accepts};
%= app->secrets->[0]
Alias for "app" in Mojolicious::Controller.
%= b('Joel is a slug')->slugify
Turn string into a Mojo::ByteStream object.
%= c('a', 'b', 'c')->shuffle->join
Turn list into a Mojo::Collection object.
%= config 'something'
Alias for "config" in Mojolicious.
%= content foo => begin test % end %= content bar => 'Hello World!' %= content 'foo' %= content 'bar' %= content
Store partial rendered content in a named buffer and retrieve it later, defaults to retrieving the named buffer content, which is used by the renderer for the layout and extends features. New content will be ignored if the named buffer is already in use.
content
layout
extends
% content_for foo => begin test % end %= content_for 'foo'
Same as "content", but appends content to named buffers if they are already in use.
% content_for message => begin Hello % end % content_for message => begin world! % end %= content 'message'
% content_with foo => begin test % end %= content_with 'foo'
Same as "content", but replaces content of named buffers if they are already in use.
% content message => begin world! % end % content_with message => begin Hello <%= content 'message' %> % end %= content 'message'
$c->continue;
Continue dispatch chain from an intermediate destination with "continue" in Mojolicious::Routes.
%= csrf_token
Get CSRF token from "session", and generate one if none exists.
% if (current_route 'login') { Welcome to Mojolicious! % } %= current_route
Check or get name of current route.
%= dumper {some => 'data'}
Dump a Perl data structure with "dumper" in Mojo::Util, very useful for debugging.
% extends 'blue'; % extends 'blue', title => 'Blue!';
Set extends stash value, all additional key/value pairs get merged into the "stash".
my $foo = $c->flash('foo'); $c = $c->flash({foo => 'bar'}); $c = $c->flash(foo => 'bar'); %= flash 'foo'
Data storage persistent only for the next request, stored in the "session".
# Show message after redirect $c->flash(message => 'User created successfully!'); $c->redirect_to('show_user', id => 23);
$c = $c->inactivity_timeout(3600);
Use "stream" in Mojo::IOLoop to find the current connection and increase timeout if possible.
# Longer version Mojo::IOLoop->stream($c->tx->connection)->timeout(3600);
%= include 'menubar' %= include 'menubar', format => 'txt'
Alias for "render_to_string" in Mojolicious::Controller.
my $bool = $c->is_fresh; my $bool = $c->is_fresh(etag => 'abc'); my $bool = $c->is_fresh(last_modified => $epoch);
Check freshness of request by comparing the If-None-Match and If-Modified-Since request headers to the ETag and Last-Modified response headers with "is_fresh" in Mojolicious::Static.
If-None-Match
If-Modified-Since
ETag
Last-Modified
# Add ETag/Last-Modified headers and check freshness before rendering $c->is_fresh(etag => 'abc', last_modified => 1424985708) ? $c->rendered(304) : $c->render(text => 'I ♥ Mojolicious!');
% layout 'green'; % layout 'green', title => 'Green!';
Set layout stash value, all additional key/value pairs get merged into the "stash".
%= param 'foo'
Alias for "param" in Mojolicious::Controller.
my $promise = $c->proxy->get_p('http://example.com' => {Accept => '*/*'});
Perform non-blocking GET request and forward response as efficiently as possible, takes the same arguments as "get" in Mojo::UserAgent and returns a Mojo::Promise object. Note that this helper is EXPERIMENTAL and might change without warning!
# Forward with exception handling $c->proxy->get_p('http://mojolicious.org')->catch(sub { my $err = shift; $c->log->debug("Proxy error: $err"); $c->render(text => 'Something went wrong!', status => 400); });
my $promise = $c->proxy->post_p('http://example.com' => {Accept => '*/*'});
Perform non-blocking POST request and forward response as efficiently as possible, takes the same arguments as "post" in Mojo::UserAgent and returns a Mojo::Promise object. Note that this helper is EXPERIMENTAL and might change without warning!
# Forward with exception handling $c->proxy->post_p('example.com' => form => {test => 'pass'})->catch(sub { my $err = shift; $c->log->debug("Proxy error: $err"); $c->render(text => 'Something went wrong!', status => 400); });
my $promise = $c->proxy->start_p(Mojo::Transaction::HTTP->new);
Perform non-blocking request for a custom Mojo::Transaction::HTTP object and forward response as efficiently as possible, returns a Mojo::Promise object. Note that this helper is EXPERIMENTAL and might change without warning!
# Forward with exception handling my $tx = $c->ua->build_tx(GET => 'http://mojolicious.org'); $c->proxy->start_p($tx)->catch(sub { my $err = shift; $c->log->debug("Proxy error: $err"); $c->render(text => 'Something went wrong!', status => 400); }); # Forward with custom request and response headers my $headers = $c->req->headers->clone->dehop; $headers->header('X-Proxy' => 'Mojo'); my $tx = $c->ua->build_tx(GET => 'http://example.com' => $headers->to_hash); $c->proxy->start_p($tx); $tx->res->content->once(body => sub { $c->res->headers->header('X-Proxy' => 'Mojo'); });
$c = $c->redirect_to('named', foo => 'bar'); $c = $c->redirect_to('named', {foo => 'bar'}); $c = $c->redirect_to('/index.html'); $c = $c->redirect_to('http://example.com/index.html');
Prepare a 302 (if the status code is not already 3xx) redirect response with Location header, takes the same arguments as "url_for".
302
3xx
Location
# Moved Permanently $c->res->code(301); $c->redirect_to('some_route'); # Temporary Redirect $c->res->code(307); $c->redirect_to('some_route');
$c->reply->asset(Mojo::Asset::File->new);
Reply with a Mojo::Asset::File or Mojo::Asset::Memory object using "serve_asset" in Mojolicious::Static, and perform content negotiation with Range, If-Modified-Since and If-None-Match headers.
Range
# Serve asset with custom modification time my $asset = Mojo::Asset::Memory->new; $asset->add_chunk('Hello World!')->mtime(784111777); $c->res->headers->content_type('text/plain'); $c->reply->asset($asset); # Serve static file if it exists if (my $asset = $c->app->static->file('images/logo.png')) { $c->res->headers->content_type('image/png'); $c->reply->asset($asset); }
$c = $c->reply->exception('Oops!'); $c = $c->reply->exception(Mojo::Exception->new);
Render the exception template exception.$mode.$format.* or exception.$format.* and set the response status code to 500. Also sets the stash values exception to a Mojo::Exception object and snapshot to a copy of the "stash" for use in the templates.
exception.$mode.$format.*
exception.$format.*
500
exception
snapshot
$c->reply->file('/etc/passwd');
Reply with a static file from an absolute path anywhere on the file system using "static" in Mojolicious.
# Longer version $c->reply->asset(Mojo::Asset::File->new(path => '/etc/passwd')); # Serve file from an absolute path with a custom content type $c->res->headers->content_type('application/myapp'); $c->reply->file('/home/sri/foo.txt'); # Serve file from a secret application directory $c->reply->file($c->app->home->child('secret', 'file.txt'));
$c = $c->reply->not_found;
Render the not found template not_found.$mode.$format.* or not_found.$format.* and set the response status code to 404. Also sets the stash value snapshot to a copy of the "stash" for use in the templates.
not_found.$mode.$format.*
not_found.$format.*
404
my $bool = $c->reply->static('images/logo.png'); my $bool = $c->reply->static('../lib/MyApp.pm');
Reply with a static file using "static" in Mojolicious, usually from the public directories or DATA sections of your application. Note that this helper uses a relative path, but does not protect from traversing to parent directories.
public
DATA
# Serve file from a relative path with a custom content type $c->res->headers->content_type('application/myapp'); $c->reply->static('foo.txt');
$c = $c->respond_to( json => {json => {message => 'Welcome!'}}, html => {template => 'welcome'}, any => sub {...} );
Automatically select best possible representation for resource from format GET/POST parameter, format stash value or Accept request header, defaults to "default_format" in Mojolicious::Renderer or rendering an empty 204 response. Each representation can be handled with a callback or a hash reference containing arguments to be passed to "render" in Mojolicious::Controller.
204
# Everything else than "json" and "xml" gets a 204 response $c->respond_to( json => sub { $c->render(json => {just => 'works'}) }, xml => {text => '<just>works</just>'}, any => {data => '', status => 204} );
For more advanced negotiation logic you can also use "accepts".
%= session 'foo'
Alias for "session" in Mojolicious::Controller.
%= stash 'foo' % stash foo => 'bar';
Alias for "stash" in Mojolicious::Controller.
%= stash('name') // 'Somebody'
$c->timing->begin('foo');
Create named timestamp for "timing->elapsed".
my $elapsed = $c->timing->elapsed('foo');
Return fractional amount of time in seconds since named timstamp has been created with "timing->begin" or undef if no such timestamp exists.
undef
# Log timing information $c->timing->begin('database_stuff'); ... my $elapsed = $c->timing->elapsed('database_stuff'); $c->app->log->debug("Database stuff took $elapsed seconds");
my $rps = $c->timing->rps('0.001');
Return fractional number of requests that could be performed in one second if every singe one took the given amount of time in seconds or undef if the number is too low.
# Log more timing information $c->timing->begin('web_stuff'); ... my $elapsed = $c->timing->elapsed('web_stuff'); my $rps = $c->timing->rps($elapsed); $c->app->log->debug("Web stuff took $elapsed seconds ($rps per second)");
$c->timing->server_timing('metric'); $c->timing->server_timing('metric', 'Some Description'); $c->timing->server_timing('metric', 'Some Description', '0.001');
Create Server-Timing header with optional description and duration.
Server-Timing
# "Server-Timing: miss" $c->timing->server_timing('miss'); # "Server-Timing: dc;desc=atl" $c->timing->server_timing('dc', 'atl'); # "Server-Timing: db;desc=Database;dur=0.0001" $c->timing->begin('database_stuff'); ... my $elapsed = $c->timing->elapsed('database_stuff'); $c->timing->server_timing('db', 'Database', $elapsed); # "Server-Timing: miss, dc;desc=atl" $c->timing->server_timing('miss'); $c->timing->server_timing('dc', 'atl');
%= title % title 'Welcome!'; % title 'Welcome!', foo => 'bar';
Get or set title stash value, all additional key/value pairs get merged into the "stash".
title
%= ua->get('mojolicious.org')->result->dom->at('title')->text
Alias for "ua" in Mojolicious.
%= url_for 'named', controller => 'bar', action => 'baz'
Alias for "url_for" in Mojolicious::Controller.
%= url_for('/index.html')->query(foo => 'bar')
%= url_with 'named', controller => 'bar', action => 'baz'
Does the same as "url_for", but inherits query parameters from the current request.
%= url_with->query({page => 2})
my $v = $c->validation;
Get Mojolicious::Validator::Validation object for current request to validate file uploads as well as GET and POST parameters extracted from the query string and application/x-www-form-urlencoded or multipart/form-data message body. Parts of the request body need to be loaded into memory to parse POST parameters, so you have to make sure it is not excessively large. There's a 16MiB limit for requests by default.
application/x-www-form-urlencoded
multipart/form-data
# Validate GET/POST parameter my $v = $c->validation; $v->required('title', 'trim')->size(3, 50); my $title = $v->param('title'); # Validate file upload my $v = $c->validation; $v->required('tarball')->upload->size(1, 1048576); my $tarball = $v->param('tarball');
Mojolicious::Plugin::DefaultHelpers inherits all methods from Mojolicious::Plugin and implements the following new ones.
$plugin->register(Mojolicious->new);
Register helpers in Mojolicious application.
Mojolicious, Mojolicious::Guides, https://mojolicious.org.
To install Mojolicious, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Mojolicious
CPAN shell
perl -MCPAN -e shell install Mojolicious
For more information on module installation, please visit the detailed CPAN module installation guide.