How to use the orchestra.core.validators function in orchestra

('id', models.AutoField(auto_created=True, serialize=False, verbose_name='ID', primary_key=True)),
                ('identifier', orchestra.models.fields.NullableCharField(max_length=256, help_text='A unique identifier for this service.', unique=True, null=True, verbose_name='identifier')),
                ('description', models.TextField(blank=True, verbose_name='description')),
                ('amount', models.PositiveIntegerField(default=1, verbose_name='amount')),
                ('is_active', models.BooleanField(default=True, help_text='Designates whether this service should be treated as active. Unselect this instead of deleting services.', verbose_name='active')),
                ('account', models.ForeignKey(related_name='miscellaneous', verbose_name='account', to=settings.AUTH_USER_MODEL)),
            ],
            options={
                'verbose_name_plural': 'miscellaneous',
            },
        ),
        migrations.CreateModel(
            name='MiscService',
            fields=[
                ('id', models.AutoField(auto_created=True, serialize=False, verbose_name='ID', primary_key=True)),
                ('name', models.CharField(max_length=32, help_text='Raw name used for internal referenciation, i.e. service match definition', unique=True, verbose_name='name', validators=[orchestra.core.validators.validate_name])),
                ('verbose_name', models.CharField(max_length=256, help_text='Human readable name', blank=True, verbose_name='verbose name')),
                ('description', models.TextField(help_text='Optional description', blank=True, verbose_name='description')),
                ('has_identifier', models.BooleanField(default=True, help_text='Designates if this service has a <b>unique text</b> field that identifies it or not.', verbose_name='has identifier')),
                ('has_amount', models.BooleanField(default=False, help_text='Designates whether this service has <tt>amount</tt> property or not.', verbose_name='has amount')),
                ('is_active', models.BooleanField(default=True, help_text='Whether new instances of this service can be created or not. Unselect this instead of deleting services.', verbose_name='active')),
            ],
        ),
        migrations.AddField(
            model_name='miscellaneous',
            name='service',
            field=models.ForeignKey(related_name='instances', verbose_name='service', to='miscellaneous.MiscService'),
        ),

    @cached_property
    def directive_instance(self):
        """ Per request lived directive instance """
        return self.directive_class()
    
    def clean(self):
        self.directive_instance.validate(self)


class Content(models.Model):
    # related_name is content_set to differentiate between website.content -> webapp
    webapp = models.ForeignKey('webapps.WebApp', verbose_name=_("web application"))
    website = models.ForeignKey('websites.Website', verbose_name=_("web site"))
    path = models.CharField(_("path"), max_length=256, blank=True,
        validators=[validators.validate_url_path])
    
    class Meta:
        unique_together = ('website', 'path')
    
    def __str__(self):
        try:
            return self.website.name + self.path
        except Website.DoesNotExist:
            return self.path
    
    def clean_fields(self, *args, **kwargs):
        self.path = self.path.strip()
        return super(Content, self).clean_fields(*args, **kwargs)
    
    def clean(self):
        if not self.path:

class Migration(migrations.Migration):

    dependencies = [
        ('orchestration', '0005_auto_20150709_1016'),
    ]

    operations = [
        migrations.AlterField(
            model_name='route',
            name='backend',
            field=models.CharField(choices=[('Apache2Traffic', '[M] Apache 2 Traffic'), ('ApacheTrafficByName', '[M] ApacheTrafficByName'), ('DokuWikiMuTraffic', '[M] DokuWiki MU Traffic'), ('DovecotMaildirDisk', '[M] Dovecot Maildir size'), ('Exim4Traffic', '[M] Exim4 traffic'), ('MailmanSubscribers', '[M] Mailman subscribers'), ('MailmanTraffic', '[M] Mailman traffic'), ('MysqlDisk', '[M] MySQL disk'), ('OpenVZTraffic', '[M] OpenVZTraffic'), ('PostfixMailscannerTraffic', '[M] Postfix-Mailscanner traffic'), ('UNIXUserDisk', '[M] UNIX user disk'), ('VsFTPdTraffic', '[M] VsFTPd traffic'), ('WordpressMuTraffic', '[M] Wordpress MU Traffic'), ('OwnCloudDiskQuota', '[M] ownCloud SaaS Disk Quota'), ('OwncloudTraffic', '[M] ownCloud SaaS Traffic'), ('PhpListTraffic', '[M] phpList SaaS Traffic'), ('Apache2Controller', '[S] Apache 2'), ('BSCWController', '[S] BSCW SaaS'), ('Bind9MasterDomainController', '[S] Bind9 master domain'), ('Bind9SlaveDomainController', '[S] Bind9 slave domain'), ('DokuWikiMuController', '[S] DokuWiki multisite'), ('DrupalMuController', '[S] Drupal multisite'), ('GitLabSaaSController', '[S] GitLab SaaS'), ('AutoresponseController', '[S] Mail autoresponse'), ('MailScannerSpamRuleController', '[S] MailScanner ruleset'), ('MailmanController', '[S] Mailman'), ('MailmanVirtualDomainController', '[S] Mailman virtdomain-only'), ('MoodleController', '[S] Moodle'), ('MoodleWWWRootController', '[S] Moodle WWWRoot (required)'), ('MoodleMuController', '[S] Moodle multisite'), ('MySQLController', '[S] MySQL database'), ('MySQLUserController', '[S] MySQL user'), ('PHPController', '[S] PHP FPM/FCGID'), ('PangeaProxmoxOVZ', '[S] PangeaProxmoxOVZ'), ('PostfixAddressController', '[S] Postfix address'), ('PostfixAddressVirtualDomainController', '[S] Postfix address virtdomain-only'), ('PostfixRecipientAccessController', '[S] Postfix recipient access'), ('ProxmoxOVZ', '[S] ProxmoxOVZ'), ('uWSGIPythonController', '[S] Python uWSGI'), ('StaticController', '[S] Static'), ('SymbolicLinkController', '[S] Symbolic link webapp'), ('SyncBind9MasterDomainController', '[S] Sync Bind9 master domain'), ('SyncBind9SlaveDomainController', '[S] Sync Bind9 slave domain'), ('UNIXUserMaildirController', '[S] UNIX maildir user'), ('UNIXUserController', '[S] UNIX user'), ('WebalizerAppController', '[S] Webalizer App'), ('WebalizerController', '[S] Webalizer Content'), ('WordPressURLController', '[S] WordPress URL'), ('WordPressController', '[S] Wordpress'), ('WordpressMuController', '[S] Wordpress multisite'), ('OwnCloudController', '[S] ownCloud SaaS'), ('PhpListSaaSController', '[S] phpList SaaS')], max_length=256, verbose_name='backend'),
        ),
        migrations.AlterField(
            model_name='server',
            name='address',
            field=orchestra.models.fields.NullableCharField(help_text='Optional IP address or domain name. If blank, name field will be used for address resolution.<br>If the IP address never changes you can set this field and save DNS requests.', verbose_name='address', validators=[orchestra.core.validators.OrValidator(orchestra.core.validators.validate_ip_address, orchestra.core.validators.validate_hostname)], blank=True, max_length=256, unique=True, null=True),
        ),
        migrations.AlterField(
            model_name='server',
            name='name',
            field=models.CharField(help_text='Verbose name or hostname of this server.', max_length=256, verbose_name='name', unique=True),
        ),
        migrations.AlterIndexTogether(
            name='backendoperation',
            index_together=set([('content_type', 'object_id')]),
        ),

def clean(self):
        self.verbose_name = self.verbose_name.strip()
        if self.on_demand and self.default_allocation:
            raise validators.ValidationError({
                'default_allocation': _("Default allocation can not be set for 'on demand' services")
            })
        # Validate that model path exists between ct and each monitor.model
        monitor_errors = []
        for monitor in self.monitors:
            try:
                self.get_model_path(monitor)
            except (RuntimeError, LookupError):
                model = apps.get_model(ServiceMonitor.get_backend(monitor).model)
                monitor_errors.append(model._meta.model_name)
        if monitor_errors:
            model_name = self.content_type.model_class()._meta.model_name
            raise validators.ValidationError({
                'monitors': [
                    _("Path does not exists between '%s' and '%s'") % (
                        error,

class Migration(migrations.Migration):

    dependencies = [
        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
        ('domains', '0001_initial'),
    ]

    operations = [
        migrations.CreateModel(
            name='List',
            fields=[
                ('id', models.AutoField(auto_created=True, verbose_name='ID', serialize=False, primary_key=True)),
                ('name', models.CharField(max_length=128, validators=[orchestra.core.validators.validate_name], unique=True, verbose_name='name', help_text='Default list address <name>@lists.orchestra.lan')),
                ('address_name', models.CharField(max_length=128, validators=[orchestra.core.validators.validate_name], verbose_name='address name', blank=True)),
                ('admin_email', models.EmailField(max_length=254, verbose_name='admin email', help_text='Administration email address')),
                ('is_active', models.BooleanField(default=True, verbose_name='active', help_text='Designates whether this account should be treated as active. Unselect this instead of deleting accounts.')),
                ('account', models.ForeignKey(related_name='lists', to=settings.AUTH_USER_MODEL, verbose_name='Account')),
                ('address_domain', models.ForeignKey(null=True, blank=True, to='domains.Domain', verbose_name='address domain')),
            ],
        ),
        migrations.AlterUniqueTogether(
            name='list',
            unique_together=set([('address_name', 'address_domain')]),
        ),

import jsonfield.fields
from django.conf import settings


class Migration(migrations.Migration):

    dependencies = [
        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
    ]

    operations = [
        migrations.CreateModel(
            name='WebApp',
            fields=[
                ('id', models.AutoField(verbose_name='ID', auto_created=True, serialize=False, primary_key=True)),
                ('name', models.CharField(verbose_name='name', validators=[orchestra.core.validators.validate_name], help_text='The app will be installed in %(home)s/webapps/%(app_name)s', max_length=128)),
                ('type', models.CharField(verbose_name='type', max_length=32, choices=[('php', 'PHP'), ('python', 'Python'), ('static', 'Static'), ('symbolic-link', 'Symbolic link'), ('webalizer', 'Webalizer'), ('wordpress-php', 'WordPress')])),
                ('data', jsonfield.fields.JSONField(verbose_name='data', blank=True, help_text='Extra information dependent of each service.', default={})),
                ('account', models.ForeignKey(verbose_name='Account', related_name='webapps', to=settings.AUTH_USER_MODEL)),
            ],
            options={
                'verbose_name': 'Web App',
                'verbose_name_plural': 'Web Apps',
            },
        ),
        migrations.CreateModel(
            name='WebAppOption',
            fields=[
                ('id', models.AutoField(verbose_name='ID', auto_created=True, serialize=False, primary_key=True)),
                ('name', models.CharField(verbose_name='name', max_length=128, choices=[(None, '-------'), ('FileSystem', [('public-root', 'Public root')]), ('Process', [('timeout', 'Process timeout'), ('processes', 'Number of processes')]), ('PHP', [('enable_functions', 'Enable functions'), ('allow_url_include', 'Allow URL include'), ('allow_url_fopen', 'Allow URL fopen'), ('auto_append_file', 'Auto append file'), ('auto_prepend_file', 'Auto prepend file'), ('date.timezone', 'date.timezone'), ('default_socket_timeout', 'Default socket timeout'), ('display_errors', 'Display errors'), ('extension', 'Extension'), ('magic_quotes_gpc', 'Magic quotes GPC'), ('magic_quotes_runtime', 'Magic quotes runtime'), ('magic_quotes_sybase', 'Magic quotes sybase'), ('max_input_time', 'Max input time'), ('max_input_vars', 'Max input vars'), ('memory_limit', 'Memory limit'), ('mysql.connect_timeout', 'Mysql connect timeout'), ('output_buffering', 'Output buffering'), ('register_globals', 'Register globals'), ('post_max_size', 'Post max size'), ('sendmail_path', 'Sendmail path'), ('session.bug_compat_warn', 'Session bug compat warning'), ('session.auto_start', 'Session auto start'), ('safe_mode', 'Safe mode'), ('suhosin.post.max_vars', 'Suhosin POST max vars'), ('suhosin.get.max_vars', 'Suhosin GET max vars'), ('suhosin.request.max_vars', 'Suhosin request max vars'), ('suhosin.session.encrypt', 'Suhosin session encrypt'), ('suhosin.simulation', 'Suhosin simulation'), ('suhosin.executor.include.whitelist', 'Suhosin executor include whitelist'), ('upload_max_filesize', 'Upload max filesize'), ('zend_extension', 'Zend extension')])])),
                ('value', models.CharField(verbose_name='value', max_length=256)),
                ('webapp', models.ForeignKey(verbose_name='Web application', related_name='options', to='webapps.WebApp')),

def by_is_main(self, is_main=True, **kwargs):
        if is_main:
            return self.filter(account__main_systemuser_id=F('id'))
        else:
            return self.exclude(account__main_systemuser_id=F('id'))


class SystemUser(models.Model):
    """
    System users
    
    Username max_length determined by LINUX system user/group lentgh: 32
    """
    username = models.CharField(_("username"), max_length=32, unique=True,
        help_text=_("Required. 32 characters or fewer. Letters, digits and ./-/_ only."),
        validators=[validators.validate_username])
    password = models.CharField(_("password"), max_length=128)
    account = models.ForeignKey('accounts.Account', verbose_name=_("Account"),
        related_name='systemusers')
    home = models.CharField(_("home"), max_length=256, blank=True,
        help_text=_("Starting location when login with this no-shell user."))
    directory = models.CharField(_("directory"), max_length=256, blank=True,
        help_text=_("Optional directory relative to user's home."))
    shell = models.CharField(_("shell"), max_length=32, choices=settings.SYSTEMUSERS_SHELLS,
        default=settings.SYSTEMUSERS_DEFAULT_SHELL)
    groups = models.ManyToManyField('self', blank=True, symmetrical=False,
        help_text=_("A new group will be created for the user. "
                    "Which additional groups would you like them to be a member of?"))
    is_active = models.BooleanField(_("active"), default=True,
        help_text=_("Designates whether this account should be treated as active. "
                    "Unselect this instead of deleting accounts."))

    @cached_property
    def directive_instance(self):
        """ Per request lived directive instance """
        return self.directive_class()
    
    def clean(self):
        self.directive_instance.validate(self)


class Content(models.Model):
    # related_name is content_set to differentiate between website.content -> webapp
    webapp = models.ForeignKey('webapps.WebApp', verbose_name=_("web application"))
    website = models.ForeignKey('websites.Website', verbose_name=_("web site"))
    path = models.CharField(_("path"), max_length=256, blank=True,
            validators=[validators.validate_url_path])
    
    class Meta:
        unique_together = ('website', 'path')
    
    def __unicode__(self):
        try:
            return self.website.name + self.path
        except Website.DoesNotExist:
            return self.path
    
    def clean(self):
        if not self.path:
            self.path = '/'
    
    def get_absolute_url(self):
        domain = self.website.domains.first()

]

    operations = [
        migrations.CreateModel(
            name='Content',
            fields=[
                ('id', models.AutoField(verbose_name='ID', primary_key=True, auto_created=True, serialize=False)),
                ('path', models.CharField(validators=[orchestra.core.validators.validate_url_path], verbose_name='path', max_length=256, blank=True)),
                ('webapp', models.ForeignKey(verbose_name='web application', to='webapps.WebApp')),
            ],
        ),
        migrations.CreateModel(
            name='Website',
            fields=[
                ('id', models.AutoField(verbose_name='ID', primary_key=True, auto_created=True, serialize=False)),
                ('name', models.CharField(validators=[orchestra.core.validators.validate_name], verbose_name='name', max_length=128)),
                ('protocol', models.CharField(verbose_name='protocol', default='http', choices=[('http', 'HTTP'), ('https', 'HTTPS'), ('http/https', 'HTTP and HTTPS'), ('https-only', 'HTTPS only')], help_text='Select the protocol(s) for this website<br><tt>HTTPS only</tt> performs a redirection from <tt>http</tt> to <tt>https</tt>.', max_length=16)),
                ('is_active', models.BooleanField(verbose_name='active', default=True)),
                ('account', models.ForeignKey(related_name='websites', verbose_name='Account', to=settings.AUTH_USER_MODEL)),
                ('contents', models.ManyToManyField(through='websites.Content', to='webapps.WebApp')),
                ('domains', models.ManyToManyField(verbose_name='domains', related_name='websites', to='domains.Domain')),
            ],
        ),
        migrations.CreateModel(
            name='WebsiteDirective',
            fields=[
                ('id', models.AutoField(verbose_name='ID', primary_key=True, auto_created=True, serialize=False)),
                ('name', models.CharField(verbose_name='name', choices=[(None, '-------'), ('SSL', [('ssl-ca', 'SSL CA'), ('ssl-cert', 'SSL cert'), ('ssl-key', 'SSL key')]), ('HTTPD', [('redirect', 'Redirection'), ('proxy', 'Proxy'), ('error-document', 'ErrorDocumentRoot')]), ('ModSecurity', [('sec-rule-remove', 'SecRuleRemoveById'), ('sec-engine', 'SecRuleEngine Off')]), ('SaaS', [('wordpress-saas', 'WordPress SaaS'), ('dokuwiki-saas', 'DokuWiki SaaS'), ('drupal-saas', 'Drupdal SaaS')])], max_length=128)),
                ('value', models.CharField(verbose_name='value', max_length=256)),
                ('website', models.ForeignKey(related_name='directives', verbose_name='web site', to='websites.Website')),
            ],
        ),

import orchestra.core.validators
from django.conf import settings


class Migration(migrations.Migration):

    dependencies = [
#        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
    ]

    operations = [
        migrations.CreateModel(
            name='SystemUser',
            fields=[
                ('id', models.AutoField(primary_key=True, serialize=False, auto_created=True, verbose_name='ID')),
                ('username', models.CharField(validators=[orchestra.core.validators.validate_username], unique=True, help_text='Required. 64 characters or fewer. Letters, digits and ./-/_ only.', max_length=32, verbose_name='username')),
                ('password', models.CharField(max_length=128, verbose_name='password')),
                ('home', models.CharField(blank=True, max_length=256, help_text='Starting location when login with this no-shell user.', verbose_name='home')),
                ('directory', models.CharField(blank=True, max_length=256, help_text="Optional directory relative to user's home.", verbose_name='directory')),
                ('shell', models.CharField(default='/dev/null', max_length=32, choices=[('/dev/null', 'No shell, FTP only'), ('/bin/rssh', 'No shell, SFTP/RSYNC only'), ('/bin/bash', '/bin/bash'), ('/bin/sh', '/bin/sh')], verbose_name='shell')),
                ('is_active', models.BooleanField(default=True, help_text='Designates whether this account should be treated as active. Unselect this instead of deleting accounts.', verbose_name='active')),
#                ('account', models.ForeignKey(to=settings.AUTH_USER_MODEL, related_name='systemusers', verbose_name='Account')),
                ('groups', models.ManyToManyField(to='systemusers.SystemUser', blank=True, help_text='A new group will be created for the user. Which additional groups would you like them to be a member of?')),
            ],