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import os |
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import logging |
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from ckan.authz import Authorizer |
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from ckan.logic.converters import convert_to_extras,\ |
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convert_from_extras, convert_to_tags, convert_from_tags, free_tags_only |
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from ckan.logic import get_action, NotFound |
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from ckan.logic.schema import package_form_schema, group_form_schema |
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from ckan.lib.base import c, model |
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from ckan.plugins import IDatasetForm, IGroupForm, IConfigurer |
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from ckan.plugins import IGenshiStreamFilter |
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from ckan.plugins import implements, SingletonPlugin |
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from ckan.lib.navl.validators import ignore_missing, keep_extras |
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log = logging.getLogger(__name__) |
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EXAMPLE_VOCAB = u'example_vocab' |
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class ExampleGroupForm(SingletonPlugin): |
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"""This plugin demonstrates how a class packaged as a CKAN |
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extension might extend CKAN behaviour by providing custom forms |
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based on the type of a Group. |
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In this case, we implement two extension interfaces to provide custom |
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forms for specific types of group. |
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- ``IConfigurer`` allows us to override configuration normally |
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found in the ``ini``-file. Here we use it to specify where the |
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form templates can be found. |
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- ``IGroupForm`` allows us to provide a custom form for a dataset |
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based on the 'type' that may be set for a group. Where the |
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'type' matches one of the values in group_types then this |
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class will be used. |
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""" |
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implements(IGroupForm, inherit=True) |
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implements(IConfigurer, inherit=True) |
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def update_config(self, config): |
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""" |
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This IConfigurer implementation causes CKAN to look in the |
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```templates``` directory when looking for the group_form() |
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""" |
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here = os.path.dirname(__file__) |
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rootdir = os.path.dirname(os.path.dirname(here)) |
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template_dir = os.path.join(rootdir, 'ckanext', |
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'example', 'theme', 'templates') |
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config['extra_template_paths'] = ','.join([template_dir, |
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config.get('extra_template_paths', '')]) |
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def group_form(self): |
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""" |
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Returns a string representing the location of the template to be |
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rendered. e.g. "forms/group_form.html". |
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""" |
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return 'forms/group_form.html' |
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def group_types(self): |
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""" |
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Returns an iterable of group type strings. |
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If a request involving a group of one of those types is made, then |
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this plugin instance will be delegated to. |
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There must only be one plugin registered to each group type. Any |
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attempts to register more than one plugin instance to a given group |
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type will raise an exception at startup. |
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""" |
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return ["testgroup"] |
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def is_fallback(self): |
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""" |
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Returns true iff this provides the fallback behaviour, when no other |
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plugin instance matches a group's type. |
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As this is not the fallback controller we should return False. If |
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we were wanting to act as the fallback, we'd return True |
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""" |
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return False |
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def form_to_db_schema(self): |
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""" |
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Returns the schema for mapping group data from a form to a format |
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suitable for the database. |
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""" |
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return group_form_schema() |
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def db_to_form_schema(self): |
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""" |
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Returns the schema for mapping group data from the database into a |
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format suitable for the form (optional) |
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""" |
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return {} |
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def check_data_dict(self, data_dict): |
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""" |
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Check if the return data is correct. |
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raise a DataError if not. |
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""" |
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def setup_template_variables(self, context, data_dict): |
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""" |
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Add variables to c just prior to the template being rendered. |
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""" |
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class ExampleDatasetForm(SingletonPlugin): |
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"""This plugin demonstrates how a theme packaged as a CKAN |
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extension might extend CKAN behaviour. |
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In this case, we implement three extension interfaces: |
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- ``IConfigurer`` allows us to override configuration normally |
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found in the ``ini``-file. Here we use it to specify where the |
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form templates can be found. |
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- ``IDatasetForm`` allows us to provide a custom form for a dataset |
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based on the type_name that may be set for a package. Where the |
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type_name matches one of the values in package_types then this |
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class will be used. |
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""" |
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implements(IDatasetForm, inherit=True) |
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implements(IConfigurer, inherit=True) |
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implements(IGenshiStreamFilter) |
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def update_config(self, config): |
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""" |
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This IConfigurer implementation causes CKAN to look in the |
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```templates``` directory when looking for the package_form() |
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""" |
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here = os.path.dirname(__file__) |
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rootdir = os.path.dirname(os.path.dirname(here)) |
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template_dir = os.path.join(rootdir, 'ckanext', |
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'example', 'theme', 'templates') |
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config['extra_template_paths'] = ','.join([template_dir, |
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config.get('extra_template_paths', '')]) |
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# def configure(self, config): |
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# ''' |
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# Adds some new vocabularies to the database if they don't already exist. |
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# ''' |
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# # Add a 'genre' vocabulary with some tags. |
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# self.genre_vocab = model.Vocabulary.get('Genre') |
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# if not self.genre_vocab: |
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# log.info("Adding vocab Genre") |
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# self.genre_vocab = model.Vocabulary('Genre') |
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# model.Session.add(self.genre_vocab) |
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# model.Session.commit() |
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# log.info("Adding example tags to vocab %s" % self.genre_vocab.name) |
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# jazz_tag = model.Tag('jazz', self.genre_vocab.id) |
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# soul_tag = model.Tag('soul', self.genre_vocab.id) |
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# model.Session.add(jazz_tag) |
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# model.Session.add(soul_tag) |
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# model.Session.commit() |
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# # Add a 'composer' vocabulary with some tags. |
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# self.composer_vocab = model.Vocabulary.get('Composer') |
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# if not self.composer_vocab: |
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# log.info("Adding vocab Composer") |
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# self.composer_vocab = model.Vocabulary('Composer') |
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# model.Session.add(self.composer_vocab) |
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# model.Session.commit() |
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# log.info("Adding example tags to vocab %s" % |
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# self.composer_vocab.name) |
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# mintzer_tag = model.Tag('Bob Mintzer', self.composer_vocab.id) |
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# lewis_tag = model.Tag('Steve Lewis', self.composer_vocab.id) |
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# model.Session.add(mintzer_tag) |
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# model.Session.add(lewis_tag) |
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# model.Session.commit() |
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def package_form(self): |
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""" |
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Returns a string representing the location of the template to be |
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rendered. e.g. "package/new_package_form.html". |
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""" |
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return 'forms/dataset_form.html' |
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def is_fallback(self): |
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""" |
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Returns true iff this provides the fallback behaviour, when no other |
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plugin instance matches a package's type. |
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As this is not the fallback controller we should return False. If |
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we were wanting to act as the fallback, we'd return True |
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""" |
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return True |
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def package_types(self): |
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""" |
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Returns an iterable of package type strings. |
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If a request involving a package of one of those types is made, then |
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this plugin instance will be delegated to. |
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There must only be one plugin registered to each package type. Any |
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attempts to register more than one plugin instance to a given package |
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type will raise an exception at startup. |
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""" |
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return ["example_dataset_form"] |
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def setup_template_variables(self, context, data_dict=None): |
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""" |
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Adds variables to c just prior to the template being rendered that can |
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then be used within the form |
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""" |
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c.licences = [('', '')] + model.Package.get_license_options() |
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c.publishers = [('Example publisher', 'Example publisher 2')] |
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c.is_sysadmin = Authorizer().is_sysadmin(c.user) |
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c.resource_columns = model.Resource.get_columns() |
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try: |
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c.vocab_tags = get_action('tag_list')(context, {'vocabulary_id': EXAMPLE_VOCAB}) |
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# c.genre_tags = get_action('tag_list')(context, {'vocabulary_id': self.genre_vocab.name}) |
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# c.composer_tags = get_action('tag_list')(context, {'vocabulary_id': self.composer_vocab.name}) |
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except NotFound: |
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c.vocab_tags = None |
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## This is messy as auths take domain object not data_dict |
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pkg = context.get('package') or c.pkg |
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if pkg: |
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c.auth_for_change_state = Authorizer().am_authorized( |
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c, model.Action.CHANGE_STATE, pkg) |
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def form_to_db_schema(self): |
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""" |
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Returns the schema for mapping package data from a form to a format |
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suitable for the database. |
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""" |
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schema = package_form_schema() |
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schema.update({ |
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'published_by': [ignore_missing, unicode, convert_to_extras], |
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'vocab_tags': [ignore_missing, convert_to_tags(EXAMPLE_VOCAB)], |
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# 'genre_tags': [ignore_missing, convert_to_tags(self.genre_vocab.name)], |
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# 'composer_tags': [ignore_missing, convert_to_tags(self.composer_vocab.name)], |
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}) |
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return schema |
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def db_to_form_schema(self): |
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""" |
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Returns the schema for mapping package data from the database into a |
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format suitable for the form (optional) |
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""" |
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schema = package_form_schema() |
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schema.update({ |