File Coverage

blib/lib/Mojolicious/Plugin/Yancy.pm

Criterion	Covered	Total	%
statement	200	210	95.2
branch	47	62	75.8
condition	29	39	74.3
subroutine	30	32	93.7
pod	1	1	100.0
total	307	344	89.2

package Mojolicious::Plugin::Yancy;
our $VERSION = '1.087';
# ABSTRACT: Embed a simple admin CMS into your Mojolicious application

#pod =head1 SYNOPSIS
#pod
#pod     use Mojolicious::Lite;
#pod     plugin Yancy => backend => 'sqlite:myapp.db'; # mysql, pg, dbic...
#pod     app->start;
#pod
#pod =head1 DESCRIPTION
#pod
#pod This plugin allows you to add a simple content management system (CMS)
#pod to administrate content on your L site. This includes
#pod a JavaScript web application to edit the content and a REST API to help
#pod quickly build your own application.
#pod
#pod =head1 CONFIGURATION
#pod
#pod For getting started with a configuration for Yancy, see
#pod the L<"Yancy Guides"|Yancy::Guides>.
#pod
#pod Additional configuration keys accepted by the plugin are:
#pod
#pod =over
#pod
#pod =item backend
#pod
#pod In addition to specifying the backend as a single URL (see L<"Database
#pod Backend"|Yancy::Guides::Schema/Database Backend>), you can specify it as
#pod a hashref of C<< class => $db >>. This allows you to share database
#pod connections.
#pod
#pod     use Mojolicious::Lite;
#pod     use Mojo::Pg;
#pod     helper pg => sub { state $pg = Mojo::Pg->new( 'postgres:///myapp' ) };
#pod     plugin Yancy => { backend => { Pg => app->pg } };
#pod
#pod =item model
#pod
#pod (optional) Specify a model class or object that extends L.
#pod By default, will create a basic L object.
#pod
#pod     plugin Yancy => { backend => { Pg => app->pg }, model => 'MyApp::Model' };
#pod
#pod     my $model = Yancy::Model->with_roles( 'MyRole' );
#pod     plugin Yancy => { backend => { Pg => app->pg }, model => $model };
#pod
#pod =item route
#pod
#pod A base route to add the Yancy editor to. This allows you to customize
#pod the URL and add authentication or authorization. Defaults to allowing
#pod access to the Yancy web application under C, and the REST API
#pod under C.
#pod
#pod This can be a string or a L object.
#pod
#pod     # These are equivalent
#pod     use Mojolicious::Lite;
#pod     plugin Yancy => { route => app->routes->any( '/admin' ) };
#pod     plugin Yancy => { route => '/admin' };
#pod
#pod =item return_to
#pod
#pod The URL to use for the "Back to Application" link. Defaults to C.
#pod
#pod =item filters
#pod
#pod A hash of C<< name => subref >> pairs of filters to make available.
#pod See L for how to create a filter subroutine.
#pod
#pod B Filters are deprecated and will be removed in Yancy v2. See
#pod L for a way to replace them.
#pod
#pod =back
#pod
#pod =head1 HELPERS
#pod
#pod This plugin adds some helpers for use in routes, templates, and plugins.
#pod
#pod =head2 yancy.config
#pod
#pod     my $config = $c->yancy->config;
#pod
#pod The current configuration for Yancy. Through this, you can edit the
#pod C configuration as needed.
#pod
#pod =head2 yancy.backend
#pod
#pod     my $be = $c->yancy->backend;
#pod
#pod Get the Yancy backend object. By default, gets the backend configured
#pod while loading the Yancy plugin. Requests can override the backend by
#pod setting the C stash value. See L for the
#pod methods you can call on a backend object and their purpose.
#pod
#pod =head2 yancy.plugin
#pod
#pod Add a Yancy plugin. Yancy plugins are Mojolicious plugins that require
#pod Yancy features and are found in the L namespace.
#pod
#pod     use Mojolicious::Lite;
#pod     plugin 'Yancy';
#pod     app->yancy->plugin( 'Auth::Basic', { schema => 'users' } );
#pod
#pod You can also add the Yancy::Plugin namespace into the default plugin
#pod lookup locations. This allows you to treat them like any other
#pod Mojolicious plugin.
#pod
#pod     # Lite app
#pod     use Mojolicious::Lite;
#pod     plugin 'Yancy', ...;
#pod     unshift @{ app->plugins->namespaces }, 'Yancy::Plugin';
#pod     plugin 'Auth::Basic', ...;
#pod
#pod     # Full app
#pod     use Mojolicious;
#pod     sub startup {
#pod         my ( $app ) = @_;
#pod         $app->plugin( 'Yancy', ... );
#pod         unshift @{ $app->plugins->namespaces }, 'Yancy::Plugin';
#pod         $app->plugin( 'Auth::Basic', ... );
#pod     }
#pod
#pod Yancy does not do this for you to avoid namespace collisions.
#pod
#pod =head2 yancy.model
#pod
#pod   my $model = $c->yancy->model;
#pod   my $schema = $c->yancy->model( $schema_name );
#pod
#pod Return the L or a L by name.
#pod
#pod =head2 yancy.list
#pod
#pod     my @items = $c->yancy->list( $schema, \%param, \%opt );
#pod
#pod Get a list of items from the backend. C<$schema> is a schema
#pod name. C<\%param> is a L
#pod structure|SQL::Abstract/WHERE CLAUSES>. Some basic examples:
#pod
#pod     # All people named exactly 'Turanga Leela'
#pod     $c->yancy->list( people => { name => 'Turanga Leela' } );
#pod
#pod     # All people with "Wong" in their name
#pod     $c->yancy->list( people => { name => { like => '%Wong%' } } );
#pod
#pod C<\%opt> is a hash of options with the following keys:
#pod
#pod =over
#pod
#pod =item * limit - The number of items to return
#pod
#pod =item * offset - The number of items to skip before returning items
#pod
#pod =back
#pod
#pod See L
#pod method's arguments|Yancy::Backend/list>. This helper only returns the list
#pod of items, not the total count of items or any other value.
#pod
#pod This helper will also filter out any password fields in the returned
#pod data. To get all the data, use the L helper to
#pod access the backend methods directly.
#pod
#pod =head2 yancy.get
#pod
#pod     my $item = $c->yancy->get( $schema, $id );
#pod
#pod Get an item from the backend. C<$schema> is the schema name.
#pod C<$id> is the ID of the item to get. See L.
#pod
#pod This helper will filter out password values in the returned data. To get
#pod all the data, use the L helper to access the
#pod backend directly.
#pod
#pod =head2 yancy.set
#pod
#pod     $c->yancy->set( $schema, $id, $item_data, %opt );
#pod
#pod Update an item in the backend. C<$schema> is the schema name.
#pod C<$id> is the ID of the item to update. C<$item_data> is a hash of data
#pod to update. See L. C<%opt> is a list of options with
#pod the following keys:
#pod
#pod =over
#pod
#pod =item * properties - An arrayref of properties to validate, for partial updates
#pod
#pod =back
#pod
#pod This helper will validate the data against the configuration and run any
#pod filters as needed. If validation fails, this helper will throw an
#pod exception with an array reference of L objects.
#pod See L and L
#pod helper|/yancy.filter.apply>. To bypass filters and validation, use the
#pod backend object directly via L.
#pod
#pod     # A route to update a comment
#pod     put '/comment/:id' => sub {
#pod         eval { $c->yancy->set( "comment", $c->stash( 'id' ), $c->req->json ) };
#pod         if ( $@ ) {
#pod             return $c->render( status => 400, errors => $@ );
#pod         }
#pod         return $c->render( status => 200, text => 'Success!' );
#pod     };
#pod
#pod =head2 yancy.create
#pod
#pod     my $item = $c->yancy->create( $schema, $item_data );
#pod
#pod Create a new item. C<$schema> is the schema name. C<$item_data>
#pod is a hash of data for the new item. See L.
#pod
#pod This helper will validate the data against the configuration and run any
#pod filters as needed. If validation fails, this helper will throw an
#pod exception with an array reference of L objects.
#pod See L and L
#pod helper|/yancy.filter.apply>. To bypass filters and validation, use the
#pod backend object directly via L.
#pod
#pod     # A route to create a comment
#pod     post '/comment' => sub {
#pod         eval { $c->yancy->create( "comment", $c->req->json ) };
#pod         if ( $@ ) {
#pod             return $c->render( status => 400, errors => $@ );
#pod         }
#pod         return $c->render( status => 200, text => 'Success!' );
#pod     };
#pod
#pod =head2 yancy.delete
#pod
#pod     $c->yancy->delete( $schema, $id );
#pod
#pod Delete an item from the backend. C<$schema> is the schema name.
#pod C<$id> is the ID of the item to delete. See L.
#pod
#pod =head2 yancy.validate
#pod
#pod     my @errors = $c->yancy->validate( $schema, $item, %opt );
#pod
#pod Validate the given C<$item> data against the configuration for the
#pod C<$schema>. If there are any errors, they are returned as an array
#pod of L objects. C<%opt> is a list of options with
#pod the following keys:
#pod
#pod =over
#pod
#pod =item * properties - An arrayref of properties to validate, for partial updates
#pod
#pod =back
#pod
#pod See L for more details.
#pod
#pod =head2 yancy.form
#pod
#pod By default, the L form plugin is
#pod loaded.  You can override this with your own form plugin. See
#pod L for more information.
#pod
#pod =head2 yancy.file
#pod
#pod By default, the L plugin is loaded to handle file
#pod uploading and file management. The default path for file uploads is
#pod C<$MOJO_HOME/public/uploads>. You can override this with your own file
#pod plugin. See L for more information.
#pod
#pod =head2 yancy.filter.add
#pod
#pod B Filters are deprecated and will be removed in Yancy v2. See
#pod L for a way to replace them.
#pod
#pod     my $filter_sub = sub { my ( $field_name, $field_value, $field_conf, @params ) = @_; ... }
#pod     $c->yancy->filter->add( $name => $filter_sub );
#pod
#pod Create a new filter. C<$name> is the name of the filter to give in the
#pod field's configuration. C<$subref> is a subroutine reference that accepts
#pod at least three arguments:
#pod
#pod =over
#pod
#pod =item * $name - The name of the schema/field being filtered
#pod
#pod =item * $value - The value to filter, either the entire item, or a single field
#pod
#pod =item * $conf - The configuration for the schema/field
#pod
#pod =item * @params - Other parameters if configured
#pod
#pod =back
#pod
#pod For example, here is a filter that will run a password through a one-way hash
#pod digest:
#pod
#pod     use Digest;
#pod     my $digest = sub {
#pod         my ( $field_name, $field_value, $field_conf ) = @_;
#pod         my $type = $field_conf->{ 'x-digest' }{ type };
#pod         Digest->new( $type )->add( $field_value )->b64digest;
#pod     };
#pod     $c->yancy->filter->add( 'digest' => $digest );
#pod
#pod And you configure this on a field using C<< x-filter >> and C<< x-digest >>:
#pod
#pod     # mysite.conf
#pod     {
#pod         schema => {
#pod             users => {
#pod                 properties => {
#pod                     username => { type => 'string' },
#pod                     password => {
#pod                         type => 'string',
#pod                         format => 'password',
#pod                         'x-filter' => [ 'digest' ], # The name of the filter
#pod                         'x-digest' => {             # Filter configuration
#pod                             type => 'SHA-1',
#pod                         },
#pod                     },
#pod                 },
#pod             },
#pod         },
#pod     }
#pod
#pod The same filter, but also configurable with extra parameters:
#pod
#pod     my $digest = sub {
#pod         my ( $field_name, $field_value, $field_conf, @params ) = @_;
#pod         my $type = ( $params[0] || $field_conf->{ 'x-digest' } )->{ type };
#pod         Digest->new( $type )->add( $field_value )->b64digest;
#pod         $field_value . $params[0];
#pod     };
#pod     $c->yancy->filter->add( 'digest' => $digest );
#pod
#pod The alternative configuration:
#pod
#pod     # mysite.conf
#pod     {
#pod         schema => {
#pod             users => {
#pod                 properties => {
#pod                     username => { type => 'string' },
#pod                     password => {
#pod                         type => 'string',
#pod                         format => 'password',
#pod                         'x-filter' => [ [ digest => { type => 'SHA-1' } ] ],
#pod                     },
#pod                 },
#pod             },
#pod         },
#pod     }
#pod
#pod Schemas can also have filters. A schema filter will get the
#pod entire hash reference as its value. For example, here's a filter that
#pod updates the C field with the current time:
#pod
#pod     $c->yancy->filter->add( 'timestamp' => sub {
#pod         my ( $schema_name, $item, $schema_conf ) = @_;
#pod         $item->{last_updated} = time;
#pod         return $item;
#pod     } );
#pod
#pod And you configure this on the schema using C<< x-filter >>:
#pod
#pod     # mysite.conf
#pod     {
#pod         schema => {
#pod             people => {
#pod                 'x-filter' => [ 'timestamp' ],
#pod                 properties => {
#pod                     name => { type => 'string' },
#pod                     address => { type => 'string' },
#pod                     last_updated => { type => 'datetime' },
#pod                 },
#pod             },
#pod         },
#pod     }
#pod
#pod You can configure filters on OpenAPI operations' inputs. These will
#pod probably want to operate on hash-refs as in the schema-level filters
#pod above. The config passed will be an empty hash. The filter can be applied
#pod to either or both of the path, or the individual operation, and will be
#pod executed in that order. E.g.:
#pod
#pod     # mysite.conf
#pod     {
#pod         openapi => {
#pod             definitions => {
#pod                 people => {
#pod                     properties => {
#pod                         name => { type => 'string' },
#pod                         address => { type => 'string' },
#pod                         last_updated => { type => 'datetime' },
#pod                     },
#pod                 },
#pod             },
#pod             paths => {
#pod                 "/people" => {
#pod                     # could also have x-filter here
#pod                     "post" => {
#pod                         'x-filter' => [ 'timestamp' ],
#pod                         # ...
#pod                     },
#pod                 },
#pod             }
#pod         },
#pod     }
#pod
#pod You can also configure filters on OpenAPI operations' outputs, this time
#pod with the key C. Again, the config passed will be an empty
#pod hash. The filter can be applied to either or both of the path, or the
#pod individual operation, and will be executed in that order. E.g.:
#pod
#pod     # mysite.conf
#pod     {
#pod         openapi => {
#pod             paths => {
#pod                 "/people" => {
#pod                     'x-filter-output' => [ 'timestamp' ],
#pod                     # ...
#pod                 },
#pod             }
#pod         },
#pod     }
#pod
#pod =head3 Supplied filters
#pod
#pod These filters are always installed.
#pod
#pod =head4 yancy.from_helper
#pod
#pod The first configured parameter is the name of an installed Mojolicious
#pod helper. That helper will be called, with any further supplied parameters,
#pod and the return value will be used as the value of that field /
#pod item. E.g. with this helper:
#pod
#pod     $app->helper( 'current_time' => sub { scalar gmtime } );
#pod
#pod This configuration will achieve the same as the above with C:
#pod
#pod     # mysite.conf
#pod     {
#pod         schema => {
#pod             people => {
#pod                 properties => {
#pod                     name => { type => 'string' },
#pod                     address => { type => 'string' },
#pod                     last_updated => {
#pod                         type => 'datetime',
#pod                         'x-filter' => [ [ 'yancy.from_helper' => 'current_time' ] ],
#pod                     },
#pod                 },
#pod             },
#pod         },
#pod     }
#pod
#pod =head4 yancy.overlay_from_helper
#pod
#pod Intended to be used for "items" rather than individual fields, as it
#pod will only work when the "value" parameter is a hash-ref.
#pod
#pod The configured parameters are supplied in pairs. The first item in the
#pod pair is the string key in the hash-ref. The second is either the name of
#pod a helper, or an array-ref with the first entry as such a helper-name,
#pod followed by parameters to pass that helper. For each pair, the helper
#pod will be called, and its return value set as the relevant key's value.
#pod E.g. with this helper:
#pod
#pod     $app->helper( 'current_time' => sub { scalar gmtime } );
#pod
#pod This configuration will achieve the same as the above with C:
#pod
#pod     # mysite.conf
#pod     {
#pod         schema => {
#pod             people => {
#pod                 'x-filter' => [
#pod                     [ 'yancy.overlay_from_helper' => 'last_updated', 'current_time' ]
#pod                 ],
#pod                 properties => {
#pod                     name => { type => 'string' },
#pod                     address => { type => 'string' },
#pod                     last_updated => { type => 'datetime' },
#pod                 },
#pod             },
#pod         },
#pod     }
#pod
#pod =head4 yancy.wrap
#pod
#pod The configured parameters are a list of strings. For each one, the
#pod original value will be wrapped in a hash with that string as the key,
#pod and the previous value as the value. E.g. with this config:
#pod
#pod     'x-filter-output' => [
#pod         [ 'yancy.wrap' => qw(user login) ],
#pod     ],
#pod
#pod The original value of say C<{ user => 'bob', password => 'h12' }>
#pod will become:
#pod
#pod     {
#pod         login => {
#pod             user => { user => 'bob', password => 'h12' }
#pod         }
#pod     }
#pod
#pod The utility of this comes from being able to expressively translate to
#pod and from a simple database structure to a situation where simple values
#pod or JSON objects need to be wrapped in objects one or two deep.
#pod
#pod =head4 yancy.unwrap
#pod
#pod This is the converse of the above. The configured parameters are a
#pod list of strings. For each one, the original value (a hash-ref) will be
#pod "unwrapped" by looking in the given hash and extracting the value whose
#pod key is that string. E.g. with this config:
#pod
#pod     'x-filter' => [
#pod         [ 'yancy.unwrap' => qw(login user) ],
#pod     ],
#pod
#pod This will achieve the reverse of the transformation given in
#pod L above. Note that obviously the order of arguments is
#pod inverted, since this operates outside-inward, while C
#pod operates inside-outward.
#pod
#pod =head4 yancy.mask
#pod
#pod Mask part of a field's value by replacing a regular expression match
#pod with the given character. The first parameter is a regular expression to
#pod match. The second parameter is the character to replace each matched
#pod character with.
#pod
#pod     # Replace all text before the @ with *
#pod     'x-filter' => [
#pod         [ 'yancy.mask' => '^[^@]+', '*' ]
#pod     ],
#pod     # Replace all but the last two characters before the @
#pod     'x-filter' => [
#pod         [ 'yancy.mask' => '^[^@]+(?=[^@]{2}@)', '*' ]
#pod     ],
#pod
#pod =head2 yancy.filter.apply
#pod
#pod B Filters are deprecated and will be removed in Yancy v2. See
#pod L for a way to replace them.
#pod
#pod     my $filtered_data = $c->yancy->filter->apply( $schema, $item_data );
#pod
#pod Run the configured filters on the given C<$item_data>. C<$schema> is
#pod a schema name. Returns the hash of C<$filtered_data>.
#pod
#pod The property-level filters will run before any schema-level filter,
#pod so that schema-level filters can take advantage of any values set by
#pod the inner filters.
#pod
#pod =head2 yancy.filters
#pod
#pod B Filters are deprecated and will be removed in Yancy v2. See
#pod L for a way to replace them.
#pod
#pod Returns a hash-ref of all configured helpers, mapping the names to
#pod the code-refs.
#pod
#pod =head2 yancy.schema
#pod
#pod     my $schema = $c->yancy->schema( $name );
#pod     $c->yancy->schema( $name => $schema );
#pod     my $schemas = $c->yancy->schema;
#pod
#pod Get or set the JSON schema for the given schema C<$name>. If no
#pod schema name is given, returns a hashref of all the schema.
#pod
#pod =head2 log_die
#pod
#pod Raise an exception with L, first logging
#pod using L (through the L helper|Mojolicious::Plugin::DefaultHelpers/log>.
#pod
#pod =head1 TEMPLATES
#pod
#pod This plugin uses the following templates. To override these templates
#pod with your own theme, provide a template with the same name. Remember to
#pod add your template paths to the beginning of the list of paths to be sure
#pod your templates are found first:
#pod
#pod     # Mojolicious::Lite
#pod     unshift @{ app->renderer->paths }, 'template/directory';
#pod     unshift @{ app->renderer->classes }, __PACKAGE__;
#pod
#pod     # Mojolicious
#pod     sub startup {
#pod         my ( $app ) = @_;
#pod         unshift @{ $app->renderer->paths }, 'template/directory';
#pod         unshift @{ $app->renderer->classes }, __PACKAGE__;
#pod     }
#pod
#pod =over
#pod
#pod =item layouts/yancy.html.ep
#pod
#pod This layout template surrounds all other Yancy templates.  Like all
#pod Mojolicious layout templates, a replacement should use the C
#pod helper to display the page content. Additionally, a replacement should
#pod use C<< content_for 'head' >> to add content to the C element.
#pod
#pod =back
#pod
#pod =head1 SEE ALSO
#pod
#pod =cut

use Mojo::Base 'Mojolicious::Plugin';
use Yancy;
use Mojo::JSON qw( true false decode_json );
use Mojo::File qw( path );
use Mojo::Loader qw( load_class );
use Yancy::Util qw( load_backend curry copy_inline_refs derp is_type json_validator );
use Yancy::Model;
use Storable qw( dclone );
use Scalar::Util qw( blessed );

has _filters => sub { {} };

# NOTE: This class should largely be setup of paths and helpers. Special
# handling of route stashes should be in the controller object. Special
# handling of data should be in the model.
#
# Code in here is difficult to override for customizations, and should
# be avoided.

sub register {
    my ( $self, $app, $config ) = @_;

    # XXX: Move editor, auth, schema to attributes of this object.
    # That allows for easier extending/replacing of them.
    # XXX: Deprecate direct access to the backend. Backend should be
    # accessed through the schema, if needed.

    # New default for read_schema is on, since it mostly should be
    # on. Any real-world database is going to be painstakingly tedious
    # to type out in JSON schema...
    $config->{read_schema} //= !exists $config->{openapi};

    if ( $config->{collections} ) {
        derp '"collections" stash key is now "schema" in Yancy configuration';
        $config->{schema} = $config->{collections};
    }
    die "Cannot pass both openapi AND (schema or read_schema)"
        if $config->{openapi}
            && ( $config->{schema} || $config->{read_schema} );

    # Load the backend and schema
    $config = { %$config };
    $app->helper( 'yancy.backend' => sub {
        my ( $c ) = @_;
        state $default_backend = load_backend( $config->{backend}, $config->{schema} || $config->{openapi}{definitions} );
        if ( my $backend = $c->stash( 'backend' ) ) {
            $c->log->debug( 'Using override backend from stash: ' . ref $backend );
            return $backend;
        }
        return $default_backend;
    } );

    if ( $config->{openapi} ) {
        $config->{openapi} = _ensure_json_data( $app, $config->{openapi} );
        $config->{schema} = dclone( $config->{openapi}{definitions} );
    }

    my $model = $config->{model} && blessed $config->{model} ? $config->{model} : undef;
    if ( !$model ) {
      my $class = $config->{model} // 'Yancy::Model';
      $model = $class->new(
        backend => $app->yancy->backend,
        log => $app->log,
        ( read_schema => $config->{read_schema} )x!!exists $config->{read_schema},
        schema => $config->{schema},
      );
    }
    $app->helper( 'yancy.model' => sub {
        my ( $c, $schema ) = @_;
        return $schema ? $model->schema( $schema ) : $model;
    } );

    # XXX: Add the fully-read schema back to the configuration hash.
    # This will be removed in v2.
    my @schema_names = $config->{read_schema} ? $model->schema_names : grep { !$config->{schema}{$_}{'x-ignore'} } keys %{ $config->{schema} };
    for my $schema_name ( @schema_names ) {
        my $schema = $model->schema( $schema_name );
        $schema->_check_json_schema; # In case we haven't already
        $config->{schema}{ $schema_name } = dclone( $schema->json_schema );
    }
    # XXX: Add the fully-read schema back to the backend. This should be
    # removed in favor of the backend's read_schema filling things in.
    # The backend should keep a copy of the original schema, as read
    # from the database. The model's schema can be altered.
    $app->yancy->backend->schema( $model->json_schema );

    # Resources and templates
    my $share = path( __FILE__ )->sibling( 'Yancy' )->child( 'resources' );
    push @{ $app->static->paths }, $share->child( 'public' )->to_string;
    push @{ $app->renderer->paths }, $share->child( 'templates' )->to_string;
    push @{$app->routes->namespaces}, 'Yancy::Controller';
    push @{ $app->commands->namespaces }, 'Yancy::Command';
    $app->plugin( 'I18N', { namespace => 'Yancy::I18N' } );

    # Helpers
    $app->helper( 'yancy.config' => sub { return $config } );
    $app->helper( 'yancy.plugin' => \&_helper_plugin );
    $app->helper( 'yancy.schema' => \&_helper_schema );
    $app->helper( 'yancy.list' => \&_helper_list );
    $app->helper( 'yancy.get' => \&_helper_get );
    $app->helper( 'yancy.delete' => \&_helper_delete );
    $app->helper( 'yancy.set' => \&_helper_set );
    $app->helper( 'yancy.create' => \&_helper_create );
    $app->helper( 'yancy.validate' => \&_helper_validate );
    $app->helper( 'yancy.routify' => \&_helper_routify );
    $app->helper( 'log_die' => \&_helper_log_die );

    # Default form is Bootstrap4. Any form plugin added after this will
    # override this one
    $app->yancy->plugin( 'Form::Bootstrap4' );
    $app->yancy->plugin( File => {
        path => $app->home->child( 'public/uploads' ),
    } );

    $self->_helper_filter_add( undef, 'yancy.from_helper' => sub {
        my ( $field_name, $field_value, $field_conf, @params ) = @_;
        my $which_helper = shift @params;
        my $helper = $app->renderer->get_helper( $which_helper );
        $helper->( @params );
    } );
    $self->_helper_filter_add( undef, 'yancy.overlay_from_helper' => sub {
        my ( $field_name, $field_value, $field_conf, @params ) = @_;
        my %new_item = %$field_value;
        while ( my ( $key, $helper ) = splice @params, 0, 2 ) {
            ( $helper, my @this_params ) = @$helper if ref $helper eq 'ARRAY';
            my $v = $app->renderer->get_helper( $helper )->( @this_params );
            $new_item{ $key } = $v;
        }
        \%new_item;
    } );
    $self->_helper_filter_add( undef, 'yancy.wrap' => sub {
        my ( $field_name, $field_value, $field_conf, @params ) = @_;
        $field_value = { $_ => $field_value } for @params;
        $field_value;
    } );
    $self->_helper_filter_add( undef, 'yancy.unwrap' => sub {
        my ( $field_name, $field_value, $field_conf, @params ) = @_;
        $field_value = $field_value->{$_} for @params;
        $field_value;
    } );
    $self->_helper_filter_add( undef, 'yancy.mask' => sub {
        my ( $field_name, $field_value, $field_conf, $regex, $replace ) = @_;
        $field_value =~ s/($regex)/$replace x length $1/e;
        $field_value;
    } );
    for my $name ( keys %{ $config->{filters} } ) {
        $self->_helper_filter_add( undef, $name, $config->{filters}{$name} );
    }
    $app->helper( 'yancy.filter.add' => curry( \&_helper_filter_add, $self ) );
    $app->helper( 'yancy.filter.apply' => curry( \&_helper_filter_apply, $self ) );
    $app->helper( 'yancy.filters' => sub {
        state $filters = $self->_filters;
    } );

    # Some keys we used to allow on the top level configuration, but are
    # now on the editor plugin
    my @_moved_to_editor_keys = qw( api_controller info host return_to );
    if ( my @moved_keys = grep exists $config->{$_}, @_moved_to_editor_keys ) {
        derp 'Editor configuration keys should be in the `editor` configuration hash ref: '
            . join ', ', @moved_keys;
    }

    # Add the default editor unless the user explicitly disables it
    if ( !exists $config->{editor} || defined $config->{editor} ) {
        $app->yancy->plugin( 'Editor' => {
            (
                map { $_ => $config->{ $_ } }
                grep { defined $config->{ $_ } }
                qw( openapi schema route read_schema ),
                @_moved_to_editor_keys,
            ),
            %{ $config->{editor} // {} },
        } );
    }
}

# if false or a ref, just returns same
# if non-ref, treat as JSON-containing file, load and decode
sub _ensure_json_data {
    my ( $app, $data ) = @_;
    return $data if !$data or ref $data;
    # assume a file in JSON format: load and parse it
    decode_json $app->home->child( $data )->slurp;
}

sub _helper_plugin {
    my ( $c, $name, @args ) = @_;
    my $class = 'Yancy::Plugin::' . $name;
    if ( my $e = load_class( $class ) ) {
        die ref $e ? "Could not load class $class: $e" : "Could not find class $class";
    }
    my $plugin = $class->new;
    $plugin->register( $c->app, @args );
}

sub _helper_schema {
    my ( $c, $name, $schema ) = @_;
    # XXX: This helper must be deprecated in favor of using the Model,
    # because it'd just be better to have a smaller API.
    if ( !$name ) {
        return $c->yancy->backend->schema;
    }
    if ( $schema ) {
        $c->yancy->backend->schema->{ $name } = $schema;
        return;
    }
    my $info = copy_inline_refs( $c->yancy->backend->schema, "/$name" ) || return undef;
    return keys %$info ? $info : undef;
}

sub _helper_list {
    my ( $c, $schema_name, @args ) = @_;
    my @items = @{ $c->yancy->model( $schema_name )->list( @args )->{items} };
    my $schema = $c->yancy->schema( $schema_name );
    for my $prop_name ( keys %{ $schema->{properties} } ) {
        my $prop = $schema->{properties}{ $prop_name };
        if ( $prop->{format} && $prop->{format} eq 'password' ) {
            delete $_->{ $prop_name } for @items;
        }
    }
    return map { $c->yancy->filter->apply( $schema_name, $_, 'x-filter-output' ) } @items;
}

sub _helper_get {
    my ( $c, $schema_name, $id, @args ) = @_;
    my $item = $c->yancy->model( $schema_name )->get( $id, @args );
    my $schema = $c->yancy->schema( $schema_name );
    for my $prop_name ( keys %{ $schema->{properties} } ) {
        my $prop = $schema->{properties}{ $prop_name };
        if ( $prop->{format} && $prop->{format} eq 'password' ) {
            delete $item->{ $prop_name };
        }
    }
    $item = $c->yancy->filter->apply( $schema_name, $item, 'x-filter-output' );
    return $item;
}

sub _helper_delete {
    my ( $c, $schema_name, @args ) = @_;
    return $c->yancy->model( $schema_name )->delete( @args );
}

sub _helper_set {
    my ( $c, $schema, $id, $item, %opt ) = @_;
    $item = $c->yancy->filter->apply( $schema, $item );
    return $c->yancy->model( $schema )->set( $id, $item );
}

sub _helper_create {
    my ( $c, $schema, $item ) = @_;

    my $props = $c->yancy->schema( $schema )->{properties};
    # XXX: We need to fix the way defaults get set: Defaults that are
    # set by the database must not be set here. See Github #124
    $item->{ $_ } = $props->{ $_ }{default}
        for grep !exists $item->{ $_ } && exists $props->{ $_ }{default},
        keys %$props;

    $item = $c->yancy->filter->apply( $schema, $item );
    return $c->yancy->model( $schema )->create( $item );
}

sub _helper_validate {
    my ( $c, $schema_name, $input_item, %opt ) = @_;
    return $c->yancy->model( $schema_name )->validate( $input_item, %opt );
}

sub _helper_filter_apply {
    my ( $self, $c, $schema_name, $item, $output ) = @_;
    my $filter_type = $output ? 'x-filter-output' : 'x-filter';
    my $schema = $c->yancy->schema( $schema_name );
    my $filters = $self->_filters;
    for my $key ( keys %{ $schema->{properties} } ) {
        next unless my $prop_filters = $schema->{properties}{ $key }{ $filter_type };
        for my $filter ( @{ $prop_filters } ) {
            ( $filter, my @params ) = @$filter if ref $filter eq 'ARRAY';
            my $sub = $filters->{ $filter };
            $c->log_die( "Unknown filter: $filter (schema: $schema_name, field: $key)" )
                unless $sub;
            $item = { %$item, $key => $sub->(
                $key, $item->{ $key }, $schema->{properties}{ $key }, @params
            ) };
        }
    }
    if ( my $schema_filters = $schema->{$filter_type} ) {
        for my $filter ( @{ $schema_filters } ) {
            ( $filter, my @params ) = @$filter if ref $filter eq 'ARRAY';
            my $sub = $filters->{ $filter };
            $c->log_die( "Unknown filter: $filter (schema: $schema_name)" )
                unless $sub;
            $item = $sub->( $schema_name, $item, $schema, @params );
        }
    }
    return $item;
}

sub _helper_filter_add {
    my ( $self, $c, $name, $sub ) = @_;
    $self->_filters->{ $name } = $sub;
}

sub _helper_routify {
    my ( $self, @args ) = @_;
    for my $maybe_route ( @args ) {
        next unless defined $maybe_route;
        return blessed $maybe_route && $maybe_route->isa( 'Mojolicious::Routes::Route' )
            ? $maybe_route
            : $self->app->routes->any( $maybe_route )
            ;
    }
}

sub _helper_log_die {
    my ( $self, $class, $err ) = @_;
    # XXX: Handle JSON::Validator errors
    if ( !$err ) {
        $err = $class;
        $class = 'Mojo::Exception';
    }
    if ( !$class->can( 'new' ) ) {
        die $@ unless eval "package $class; use Mojo::Base 'Mojo::Exception'; 1";
    }
    my $e = $class->new( $err )->trace( 2 );
    $self->log->fatal( $e );
    die $e;
}

1;

__END__