text: """
  Visualizations resource control over the API.
  
  NOTE!: this is a work in progress and functionality and data structures
  may change often.
  """
  import json
  import logging
  
  
  from galaxy import (
      exceptions,
      util,
      web
  )
  from galaxy.managers.sharable import SharingPayload
  from galaxy.managers.visualizations import VisualizationsService
  from galaxy.model.item_attrs import UsesAnnotations
  from galaxy.web import expose_api
  from galaxy.webapps.base.controller import (
      UsesVisualizationMixin
  )
  from galaxy.webapps.base.webapp import GalaxyWebTransaction
  from . import BaseGalaxyAPIController, depends
  
  log = logging.getLogger(__name__)
  
  
  class VisualizationsController(BaseGalaxyAPIController, UsesVisualizationMixin, UsesAnnotations):
      """
      RESTful controller for interactions with visualizations.
      """
      service: VisualizationsService = depends(VisualizationsService)
  
      @expose_api
      def index(self, trans: GalaxyWebTransaction, **kwargs):
          """
          GET /api/visualizations:
          """
          rval = []
          user = trans.user
  
          # TODO: search for: title, made by user, creation time range, type (vis name), dbkey, etc.
          # TODO: limit, offset, order_by
          # TODO: deleted
  
          # this is the default search - user's vis, vis shared with user, published vis
          visualizations = self.get_visualizations_by_user(trans, user)
          visualizations += self.get_visualizations_shared_with_user(trans, user)
          visualizations += self.get_published_visualizations(trans, exclude_user=user)
          # TODO: the admin case - everything
  
          for visualization in visualizations:
              item = self.get_visualization_summary_dict(visualization)
              item = trans.security.encode_dict_ids(item)
              item['url'] = web.url_for('visualization', id=item['id'])
              rval.append(item)
  
          return rval
  
      @expose_api
      def show(self, trans: GalaxyWebTransaction, id: str, **kwargs):
          """
          GET /api/visualizations/{viz_id}
          """
          # TODO: revisions should be a contents/nested controller like viz/xxx/r/xxx)?
          # the important thing is the config
          # TODO:?? /api/visualizations/registry -> json of registry.listings?
          visualization = self.get_visualization(trans, id, check_ownership=False, check_accessible=True)
          dictionary = trans.security.encode_dict_ids(self.get_visualization_dict(visualization))
          dictionary['url'] = web.url_for(controller='visualization',
                                          action="display_by_username_and_slug", username=visualization.user.username, slug=visualization.slug)
          dictionary['annotation'] = self.get_item_annotation_str(trans.sa_session, trans.user, visualization)
          # need to encode ids in revisions as well
          encoded_revisions = []
          for revision in dictionary['revisions']:
              # NOTE: does not encode ids inside the configs
              encoded_revisions.append(trans.security.encode_id(revision))
          dictionary['revisions'] = encoded_revisions
          dictionary['latest_revision'] = trans.security.encode_dict_ids(dictionary['latest_revision'])
          if trans.app.visualizations_registry:
              visualization = trans.app.visualizations_registry.get_plugin(dictionary['type'])
              dictionary['plugin'] = visualization.to_dict()
          return dictionary
  
      @expose_api
      def create(self, trans: GalaxyWebTransaction, payload: dict, **kwargs):
          """
          POST /api/visualizations
          creates a new visualization using the given payload
  
          POST /api/visualizations?import_id={encoded_visualization_id}
          imports a copy of an existing visualization into the user's workspace
          """
          rval = None
  
          if 'import_id' in payload:
              import_id = payload['import_id']
              visualization = self.import_visualization(trans, import_id, user=trans.user)
  
          else:
              payload = self._validate_and_parse_payload(payload)
              # must have a type (I've taken this to be the visualization name)
              if 'type' not in payload:
                  raise exceptions.RequestParameterMissingException("key/value 'type' is required")
              vis_type = payload.pop('type', False)
  
              payload['save'] = True
              try:
                  # generate defaults - this will err if given a weird key?
                  visualization = self.create_visualization(trans, vis_type, **payload)
              except ValueError as val_err:
                  raise exceptions.RequestParameterMissingException(str(val_err))
  
          rval = {'id': trans.security.encode_id(visualization.id)}
  
          return rval
  
      @expose_api
      def update(self, trans: GalaxyWebTransaction, id: str, payload: dict, **kwargs):
          """
          PUT /api/visualizations/{encoded_visualization_id}
          """
          rval = None
  
          payload = self._validate_and_parse_payload(payload)
  
          # there's a differentiation here between updating the visualiztion and creating a new revision
          #   that needs to be handled clearly here
          # or alternately, using a different controller like PUT /api/visualizations/{id}/r/{id}
  
          # TODO: consider allowing direct alteration of revisions title (without a new revision)
          #   only create a new revsion on a different config
  
          # only update owned visualizations
          visualization = self.get_visualization(trans, id, check_ownership=True)
          title = payload.get('title', visualization.latest_revision.title)
          dbkey = payload.get('dbkey', visualization.latest_revision.dbkey)
          config = payload.get('config', visualization.latest_revision.config)
  
          latest_config = visualization.latest_revision.config
          if((title != visualization.latest_revision.title)
                  or (dbkey != visualization.latest_revision.dbkey)
                  or (json.dumps(config) != json.dumps(latest_config))):
              revision = self.add_visualization_revision(trans, visualization, config, title, dbkey)
              rval = {'id': id, 'revision': revision.id}
  
          # allow updating vis title
          visualization.title = title
          trans.sa_session.flush()
  
          return rval
  
      @expose_api
      def sharing(self, trans, id, payload=None, **kwd):
          """
          * GET/POST /api/pages/{id}/sharing
              View/modify sharing options for the page with the given id.
          """
          if payload:
              payload = SharingPayload(**payload)
          return self.service.sharing(trans, id, payload)
  
      def _validate_and_parse_payload(self, payload):
          """
          Validate and parse incomming data payload for a visualization.
          """
          # This layer handles (most of the stricter idiot proofing):
          #   - unknown/unallowed keys
          #   - changing data keys from api key to attribute name
          #   - protection against bad data form/type
          #   - protection against malicious data content
          # all other conversions and processing (such as permissions, etc.) should happen down the line
  
          # keys listed here don't error when attempting to set, but fail silently
          #   this allows PUT'ing an entire model back to the server without attribute errors on uneditable attrs
          valid_but_uneditable_keys = (
              'id', 'model_class'
              # TODO: fill out when we create to_dict, get_dict, whatevs
          )
          # TODO: deleted
          # TODO: importable
          ValidationError = exceptions.RequestParameterInvalidException
  
          validated_payload = {}
          for key, val in payload.items():
              # TODO: validate types in VALID_TYPES/registry names at the mixin/model level?
              if key == 'type':
                  if not isinstance(val, str):
                      raise ValidationError('{} must be a string or unicode: {}'.format(key, str(type(val))))
                  val = util.sanitize_html.sanitize_html(val)
              elif key == 'config':
                  if not isinstance(val, dict):
                      raise ValidationError('{} must be a dictionary: {}'.format(key, str(type(val))))
  
              elif key == 'annotation':
                  if not isinstance(val, str):
                      raise ValidationError('{} must be a string or unicode: {}'.format(key, str(type(val))))
                  val = util.sanitize_html.sanitize_html(val)
  
              # these are keys that actually only be *updated* at the revision level and not here
              #   (they are still valid for create, tho)
              elif key == 'title':
                  if not isinstance(val, str):
                      raise ValidationError('{} must be a string or unicode: {}'.format(key, str(type(val))))
                  val = util.sanitize_html.sanitize_html(val)
              elif key == 'slug':
                  if not isinstance(val, str):
                      raise ValidationError('{} must be a string: {}'.format(key, str(type(val))))
                  val = util.sanitize_html.sanitize_html(val)
              elif key == 'dbkey':
                  if not isinstance(val, str):
                      raise ValidationError('{} must be a string or unicode: {}'.format(key, str(type(val))))
                  val = util.sanitize_html.sanitize_html(val)
  
              elif key not in valid_but_uneditable_keys:
                  continue
                  # raise AttributeError( 'unknown key: %s' %( str( key ) ) )
  
              validated_payload[key] = val
          return validated_payload
  