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Specific # attributions are listed in the accompanying credits file. # ############################################################################## ''' Web-configurable workflow. $Id: DCWorkflow.py,v 1.6 2001/08/31 14:36:42 shane Exp $ ''' __version__='$Revision: 1.6 $'[11:-2] # Python library from string import join # Zope from ZODB import Persistent from AccessControl import getSecurityManager, ClassSecurityInfo from OFS.Folder import Folder from OFS.ObjectManager import bad_id from OFS.Traversable import Traversable from Globals import DTMLFile, PersistentMapping import Acquisition from Acquisition import aq_inner, aq_parent import Globals import App from DocumentTemplate.DT_Util import TemplateDict # CMFCore from Products.CMFCore.WorkflowCore import WorkflowException, \ ObjectDeleted, ObjectMoved from Products.CMFCore.WorkflowTool import addWorkflowFactory from Products.CMFCore.CMFCorePermissions import ManagePortal from Products.CMFCore.utils import getToolByName # DCWorkflow from utils import _dtmldir, modifyRolesForPermission from WorkflowUIMixin import WorkflowUIMixin from Transitions import TRIGGER_AUTOMATIC, TRIGGER_USER_ACTION, \ TRIGGER_WORKFLOW_METHOD from Expression import StateChangeInfo, createExprContext Unauthorized = 'Unauthorized' def checkId(id): res = bad_id(id) if res != -1 and res is not None: raise ValueError, 'Illegal ID' return 1 class DCWorkflowDefinition (WorkflowUIMixin, Folder): ''' This class is the workflow engine and the container for the workflow definition. UI methods are in WorkflowUIMixin. ''' meta_type = 'Workflow' title = 'DC Workflow Definition' _isAWorkflow = 1 state_var = 'state' initial_state = None states = None transitions = None variables = None worklists = None scripts = None permissions = () manage_options = ( {'label': 'Properties', 'action': 'manage_properties'}, {'label': 'States', 'action': 'states/manage_main'}, {'label': 'Transitions', 'action': 'transitions/manage_main'}, {'label': 'Variables', 'action': 'variables/manage_main'}, {'label': 'Worklists', 'action': 'worklists/manage_main'}, {'label': 'Scripts', 'action': 'scripts/manage_main'}, {'label': 'Permissions', 'action': 'manage_permissions'}, ) + App.Undo.UndoSupport.manage_options security = ClassSecurityInfo() security.declareObjectProtected(ManagePortal) def __init__(self, id): self.id = id from States import States self._addObject(States('states')) from Transitions import Transitions self._addObject(Transitions('transitions')) from Variables import Variables self._addObject(Variables('variables')) from Worklists import Worklists self._addObject(Worklists('worklists')) from Scripts import Scripts self._addObject(Scripts('scripts')) def _addObject(self, ob): id = ob.getId() setattr(self, id, ob) self._objects = self._objects + ( {'id': id, 'meta_type': ob.meta_type},) # # Workflow engine. # def _getStatusOf(self, ob): tool = aq_parent(aq_inner(self)) status = tool.getStatusOf(self.id, ob) if status is None: return {} else: return status def _getWorkflowStateOf(self, ob, id_only=0): tool = aq_parent(aq_inner(self)) status = tool.getStatusOf(self.id, ob) if status is None: state = self.initial_state else: state = status.get(self.state_var, None) if state is None: state = self.initial_state if id_only: return state else: return self.states.get(state, None) def _getPortalRoot(self): return aq_parent(aq_inner(aq_parent(aq_inner(self)))) security.declarePrivate('getCatalogVariablesFor') def getCatalogVariablesFor(self, ob): ''' Allows this workflow to make workflow-specific variables available to the catalog, making it possible to implement worklists in a simple way. Returns a mapping containing the catalog variables that apply to ob. ''' res = {} status = self._getStatusOf(ob) for id, vdef in self.variables.items(): if vdef.for_catalog: if status.has_key(id): value = status[id] # Not set yet. Use a default. elif vdef.default_expr is not None: ec = createExprContext(StateChangeInfo(ob, self, status)) value = vdef.default_expr(ec) else: value = vdef.default_value res[id] = value # Always provide the state variable. state_var = self.state_var res[state_var] = status.get(state_var, self.initial_state) return res security.declarePrivate('listObjectActions') def listObjectActions(self, info): ''' Allows this workflow to include actions to be displayed in the actions box. Called only when this workflow is applicable to info.content. Returns the actions to be displayed to the user. ''' ob = info.content sdef = self._getWorkflowStateOf(ob) if sdef is None: return None sm = getSecurityManager() res = [] for tid in sdef.transitions: tdef = self.transitions.get(tid, None) if tdef is not None and tdef.trigger_type == TRIGGER_USER_ACTION: if tdef.actbox_name: if self._checkTransitionGuard(tdef, ob): res.append((tid, { 'name': tdef.actbox_name % info, 'url': tdef.actbox_url % info, 'permissions': (), # Predetermined. 'category': tdef.actbox_category})) res.sort() return map((lambda (id, val): val), res) security.declarePrivate('listGlobalActions') def listGlobalActions(self, info): ''' Allows this workflow to include actions to be displayed in the actions box. Called on every request. Returns the actions to be displayed to the user. ''' if not self.worklists: return None # Optimization sm = getSecurityManager() portal = self._getPortalRoot() res = [] fmt_data = None for id, qdef in self.worklists.items(): if qdef.actbox_name: guard = qdef.guard if guard is None or guard.check(sm, self, portal): searchres = None if qdef.var_matches: # Check the catalog for items in the worklist. catalog = getToolByName(self, 'portal_catalog') dict = {} for k, v in qdef.var_matches.items(): dict[k] = v searchres = apply(catalog.searchResults, (), dict) if not searchres: continue if fmt_data is None: fmt_data = TemplateDict() fmt_data._push(info) searchres_len = lambda searchres=searchres: len(searchres) fmt_data._push({'count': searchres_len}) res.append((id, {'name': qdef.actbox_name % fmt_data, 'url': qdef.actbox_url % fmt_data, 'permissions': (), # Predetermined. 'category': qdef.actbox_category})) fmt_data._pop() res.sort() return map((lambda (id, val): val), res) security.declarePrivate('isActionSupported') def isActionSupported(self, ob, action): ''' Returns a true value if the given action name is possible in the current state. ''' sdef = self._getWorkflowStateOf(ob) if sdef is None: return 0 if action in sdef.transitions: tdef = self.transitions.get(action, None) if (tdef is not None and tdef.trigger_type == TRIGGER_USER_ACTION and self._checkTransitionGuard(tdef, ob)): return 1 return 0 security.declarePrivate('doActionFor') def doActionFor(self, ob, action, **kw): ''' Allows the user to request a workflow action. This method must perform its own security checks. ''' sdef = self._getWorkflowStateOf(ob) if sdef is None: raise WorkflowException, 'Object is in an undefined state' if action not in sdef.transitions: raise Unauthorized tdef = self.transitions.get(action, None) if tdef is None or tdef.trigger_type != TRIGGER_USER_ACTION: raise WorkflowException, ( 'Transition %s is not triggered by a user action' % action) if not self._checkTransitionGuard(tdef, ob): raise Unauthorized self._changeStateOf(ob, tdef, kw) security.declarePrivate('isWorkflowMethodSupported') def isWorkflowMethodSupported(self, ob, method_id): ''' Returns a true value if the given workflow method is supported in the current state. ''' sdef = self._getWorkflowStateOf(ob) if sdef is None: return 0 if method_id in sdef.transitions: tdef = self.transitions.get(method_id, None) if (tdef is not None and tdef.trigger_type == TRIGGER_WORKFLOW_METHOD and self._checkTransitionGuard(tdef, ob)): return 1 return 0 security.declarePrivate('wrapWorkflowMethod') def wrapWorkflowMethod(self, ob, method_id, func, args, kw): ''' Allows the user to request a workflow action. This method must perform its own security checks. ''' sdef = self._getWorkflowStateOf(ob) if sdef is None: raise WorkflowException, 'Object is in an undefined state' if method_id not in sdef.transitions: raise Unauthorized tdef = self.transitions.get(method_id, None) if tdef is None or tdef.trigger_type != TRIGGER_WORKFLOW_METHOD: raise WorkflowException, ( 'Transition %s is not triggered by a workflow method' % method_id) if not self._checkTransitionGuard(tdef, ob): raise Unauthorized res = apply(func, args, kw) try: self._changeStateOf(ob, tdef) except ObjectDeleted: # Re-raise with a different result. raise ObjectDeleted(res) except ObjectMoved, ex: # Re-raise with a different result. raise ObjectMoved(ex.getNewObject(), res) return res security.declarePrivate('isInfoSupported') def isInfoSupported(self, ob, name): ''' Returns a true value if the given info name is supported. ''' if name == self.state_var: return 1 vdef = self.variables.get(name, None) if vdef is None: return 0 return 1 security.declarePrivate('getInfoFor') def getInfoFor(self, ob, name, default): ''' Allows the user to request information provided by the workflow. This method must perform its own security checks. ''' if name == self.state_var: return self._getWorkflowStateOf(ob, 1) vdef = self.variables[name] if vdef.info_guard is not None and not vdef.info_guard.check( getSecurityManager(), self, ob): return default status = self._getStatusOf(ob) if status is not None and status.has_key(id): value = status[id] # Not set yet. Use a default. elif vdef.default_expr is not None: ec = createExprContext(StateChangeInfo(ob, self, status)) value = vdef.default_expr(ec) else: value = vdef.default_value return value security.declarePrivate('notifyCreated') def notifyCreated(self, ob): ''' Notifies this workflow after an object has been created and put in its new place. ''' try: self._changeStateOf(ob, None) except ObjectDeleted, ObjectMoved: # Swallow. pass security.declarePrivate('notifyBefore') def notifyBefore(self, ob, action): ''' Notifies this workflow of an action before it happens, allowing veto by exception. Unless an exception is thrown, either a notifySuccess() or notifyException() can be expected later on. The action usually corresponds to a method name. ''' pass security.declarePrivate('notifySuccess') def notifySuccess(self, ob, action, result): ''' Notifies this workflow that an action has taken place. ''' pass security.declarePrivate('notifyException') def notifyException(self, ob, action, exc): ''' Notifies this workflow that an action failed. ''' pass security.declarePrivate('updateRoleMappingsFor') def updateRoleMappingsFor(self, ob): ''' Changes the object permissions according to the current state. ''' changed = 0 sdef = self._getWorkflowStateOf(ob) if self.permissions: for p in self.permissions: roles = [] if sdef.permission_roles is not None: roles = sdef.permission_roles.get(p, roles) if modifyRolesForPermission(ob, p, roles): changed = 1 return changed def _checkTransitionGuard(self, t, ob): guard = t.guard if guard is None: return 1 if guard.check(getSecurityManager(), self, ob): return 1 return 0 def _changeStateOf(self, ob, tdef=None, kwargs=None): ''' Changes state. Can execute multiple transitions if there are automatic transitions. tdef set to None means the object was just created. ''' moved = 0 while 1: try: sdef = self._executeTransition(ob, tdef, kwargs) except ObjectMoved, ex: moved = 1 ob = ex.getNewObject() sdef = self._getWorkflowStateOf(ob) if sdef is None: break tdef = None for tid in sdef.transitions: t = self.transitions.get(tid, None) if t is not None and t.trigger_type == TRIGGER_AUTOMATIC: if self._checkTransitionGuard(t, ob): tdef = t break if tdef is None: # No more automatic transitions. break # Else continue. if moved: # Re-raise. raise ObjectMoved(ob) def _executeTransition(self, ob, tdef=None, kwargs=None): ''' Private method. Puts object in a new state. ''' sci = None econtext = None moved = 0 # Figure out the old and new states. old_sdef = self._getWorkflowStateOf(ob) old_state = old_sdef.getId() if tdef is None: new_state = self.initial_state former_status = {} else: new_state = tdef.new_state_id if not new_state: # Stay in same state. new_state = old_state former_status = self._getStatusOf(ob) new_sdef = self.states.get(new_state, None) if new_sdef is None: raise WorkflowException, ( 'Destination state undefined: ' + new_state) # Execute a script if specified. if tdef is not None and tdef.script_name: script = self.scripts[tdef.script_name] # Pass lots of info to the script in a single parameter. sci = StateChangeInfo( ob, self, former_status, tdef, old_sdef, new_sdef, kwargs) try: script(sci) # May throw an exception. except ObjectMoved, ex: ob = ex.getNewObject() moved = 1 # Don't re-raise # Update variables. state_values = new_sdef.var_values if state_values is None: state_values = {} tdef_exprs = None if tdef is not None: tdef_exprs = tdef.var_exprs if tdef_exprs is None: tdef_exprs = {} status = {} for id, vdef in self.variables.items(): if not vdef.for_status: continue expr = None if state_values.has_key(id): value = state_values[id] elif tdef_exprs.has_key(id): expr = tdef_exprs[id] elif vdef.default_expr is not None: expr = vdef.default_expr else: value = vdef.default_value if expr is not None: # Evaluate an expression. if econtext is None: # Lazily create the expression context. if sci is None: sci = StateChangeInfo( ob, self, former_status, tdef, old_sdef, new_sdef, kwargs) econtext = createExprContext(sci) value = expr(econtext) status[id] = value # Update state. status[self.state_var] = new_state tool = aq_parent(aq_inner(self)) tool.setStatusOf(self.id, ob, status) # Update role to permission assignments. self.updateRoleMappingsFor(ob) # Return the new state object. if moved: # Re-raise. raise ObjectMoved(ob) else: return new_sdef Globals.InitializeClass(DCWorkflowDefinition) addWorkflowFactory(DCWorkflowDefinition, id='dc_workflow', title='Web-configurable workflow')