def add_retract_transitions(wf):
"""Set up any retract transitions (from terminal states) for all workflows.
"""
def get_retract_is_allowed(from_state_id):
if from_state_id in reusable_retract_conditions:
return reusable_retract_conditions[from_state_id]
def retract_is_allowed(context):
"""A workflow condition, for system use only, for auto "retract" transition.
"""
if IFeatureAudit.providedBy(context):
changes = domain.get_changes(context, "workflow")
if changes:
prev_change = changes[0].seq_previous
if prev_change:
return from_state_id == prev_change.audit.status
return True
reusable_retract_conditions[from_state_id] = retract_is_allowed
return retract_is_allowed
def get_roles(transition):
original_roles = transition.user_data.get("_roles", [])
allowed_roles = set()
# transitions to source
tx_to_source = wf.get_transitions_to(transition.source)
for tx in tx_to_source:
if tx.source is None:
allowed_roles.update(original_roles)
else:
for role in tx.user_data.get("_roles", []):
if role in original_roles:
allowed_roles.add(role)
if not len(allowed_roles):
allowed_roles = original_roles
return allowed_roles
transitions = wf._transitions_by_id.values()
terminal_transitions = [
transition for transition in transitions
if (wf.get_transitions_from(transition.destination) == []
and transition.source
and transition.trigger in [interfaces.MANUAL, interfaces.SYSTEM])
]
from bungeni import _, translate
for transition in terminal_transitions:
roles = get_roles(transition)
if roles:
tid = get_tid(transition.destination, transition.source)
if tid in wf._transitions_by_id:
# we already have reverse transition, skip...
continue
title = _("revert_transition_title",
default="Undo - ${title}",
mapping={"title": translate(transition.title)})
title = "Undo - %s" % (transition.title)
pid = "bungeni.%s.wf.%s" % (wf.name, tid)
ntransition = Transition(title,
transition.destination,
transition.source,
trigger=interfaces.MANUAL,
condition=get_retract_is_allowed(
transition.destination),
permission=pid,
roles=roles)
transitions.append(ntransition)
zcml_transition_permission(pid, title, roles)
log.debug("Workflow [%s] adding retract transition: %r", wf.name,
ntransition.id)
wf.refresh(wf._states_by_id.values(), transitions)
def add_retract_transitions(wf):
"""Set up any retract transitions (from terminal states) for all workflows.
"""
def get_retract_is_allowed(from_state_id):
if from_state_id in reusable_retract_conditions:
return reusable_retract_conditions[from_state_id]
def retract_is_allowed(context):
"""A workflow condition, for system use only, for auto "retract" transition.
"""
if IFeatureAudit.providedBy(context):
changes = domain.get_changes(context, "workflow")
if changes:
prev_change = changes[0].seq_previous
if prev_change:
return from_state_id == prev_change.audit.status
return True
reusable_retract_conditions[from_state_id] = retract_is_allowed
return retract_is_allowed
def get_roles(transition):
original_roles = transition.user_data.get("_roles", [])
allowed_roles = set()
# transitions to source
tx_to_source = wf.get_transitions_to(transition.source)
for tx in tx_to_source:
if tx.source is None:
allowed_roles.update(original_roles)
else:
for role in tx.user_data.get("_roles", []):
if role in original_roles:
allowed_roles.add(role)
if not len(allowed_roles):
allowed_roles = original_roles
return allowed_roles
transitions = wf._transitions_by_id.values()
terminal_transitions = [
transition for transition in transitions
if (wf.get_transitions_from(transition.destination) == [] and
transition.source and
transition.trigger in [interfaces.MANUAL, interfaces.SYSTEM])
]
from bungeni import _, translate
for transition in terminal_transitions:
roles = get_roles(transition)
if roles:
tid = get_tid(transition.destination, transition.source)
if tid in wf._transitions_by_id:
# we already have reverse transition, skip...
continue
title = _("revert_transition_title",
default="Undo - ${title}",
mapping={
"title": translate(transition.title)
}
)
title = "Undo - %s" % (transition.title)
pid = "bungeni.%s.wf.%s" % (wf.name, tid)
ntransition = Transition(title, transition.destination,
transition.source,
trigger=interfaces.MANUAL,
condition=get_retract_is_allowed(transition.destination),
permission=pid,
roles=roles)
transitions.append(ntransition)
zcml_transition_permission(pid, title, roles)
log.debug("Workflow [%s] adding retract transition: %r",
wf.name, ntransition.id)
wf.refresh(wf._states_by_id.values(), transitions)
def _load(workflow_name, workflow):
""" (workflow_name:str, workflow:etree_doc) -> Workflow
"""
workflow_title = xas(workflow, "title")
naming.MSGIDS.add(workflow_title)
workflow_description = xas(workflow, "description")
naming.MSGIDS.add(workflow_description)
transitions = []
states = []
note = xas(workflow, "note")
# initial_state, in XML indicated with a transition.@source=""
initial_state = None
ZCML_PROCESSED = bool(workflow_name in ZCML_WORKFLOWS_PROCESSED)
if not ZCML_PROCESSED:
ZCML_WORKFLOWS_PROCESSED.add(workflow_name)
ZCML_LINES.append(ZCML_INDENT)
ZCML_LINES.append(ZCML_INDENT)
ZCML_LINES.append("%s<!-- %s -->" % (ZCML_INDENT, workflow_name))
def validate_id(id, tag):
"""Ensure that ID values are unique within the same XML doc scope.
"""
m = "Invalid element <%s> id=%r in workflow %r" % (tag, id,
workflow_name)
assert id not in validate_id.wuids, "%s -- id not unique in workflow document" % (
m)
validate_id.wuids.add(id)
validate_id.wuids = set() # unique IDs in this XML workflow file
def get_from_state(state_id):
if state_id is None:
return
for state in states:
if state.id == state_id:
return state
raise ValueError("Invalid value: permissions_from_state=%r" %
(state_id))
def check_not_global_grant(pid, role):
# ensure global and local assignments are distinct
# (global: global_pid_roles, workflow_name)
global_proles = global_pid_roles.get(pid, "")
assert role not in global_proles, (
"Workflow [%s] may not mix "
"global and local granting of a same permission [%s] to a "
"same role [%s].") % (workflow_name, pid, role)
# permission_actions -> permissions for this type
for (key, permission_action) in capi.schema.qualified_permission_actions(
workflow_name,
xas(workflow, "permission_actions", "").split()):
pid = "bungeni.%s.%s" % (key, permission_action)
title = "%s %s" % (permission_action,
naming.split_camel(naming.model_name(key)))
# !+ add to a Workflow.defines_permissions list
ZCML_LINES.append('%s<permission id="%s" title="%s" />' %
(ZCML_INDENT, pid, title))
provideUtility(Permission(pid), IPermission, pid)
# global grants
global_pid_roles = {} # {pid: [role]}
global_grants = get_permissions_from_allows(workflow_name, workflow)
for (setting, pid, role) in global_grants:
# for each global permission, build list of roles it is set to
global_pid_roles.setdefault(pid, []).append(role)
assert setting and pid and role, \
"Global grant must specify valid permission/role" #!+RNC
# !+ add to a Workflow.global_grants list
ZCML_LINES.append('%s<grant permission="%s" role="%s" />' %
(ZCML_INDENT, pid, role))
# no real need to check that the permission and role of a global grant
# are properly registered in the system -- an error should be raised
# by the zcml if either is not defined.
rpm.grantPermissionToRole(pid, role, check=False)
for perm, roles in global_pid_roles.items():
# assert roles mix limitations for state permissions
assert_distinct_permission_scopes(perm, roles, workflow_name,
"global grants")
# all workflow features (enabled AND disabled)
workflow_features = load_features(workflow_name, workflow)
enabled_feature_names = [None] + [
f.name for f in workflow_features if f.enabled
]
# !+EVENT_FEATURE_TYPES add each as enabled_feature_names, or extend the
# facet quailifer by feature_name(sub_type_key).facet_ref?
# workflow facets
workflow_facets = load_facets(workflow_name, workflow)
# states
for s in workflow.iterchildren("state"):
# @id
state_id = xas(s, "id")
assert state_id, "Workflow State must define @id" #!+RNC
validate_id(state_id, "state")
# @actions - transition-to-state actions
state_actions = []
for action_name in xas(s, "actions", "").split():
state_actions.append(capi.get_workflow_action(action_name))
# @permissions_from_state
permissions = [] # [ tuple(bool:int, permission:str, role:str) ]
# state.@permissions_from_state : to reduce repetition and enhance
# maintainibility of workflow XML files, a state may inherit ALL
# permissions defined by the specified state. NO other permissions
# may be specified by this state.
from_state = get_from_state(xas(s, "permissions_from_state"))
parent_permissions = xab(s, "parent_permissions")
if parent_permissions:
pass # no own permission definitions allowed
elif from_state:
# assimilate (no more no less) the state's permissions !+tuple, use same?
permissions[:] = from_state.permissions
else:
used_facets_fq = resolve_state_facets(workflow_name,
workflow_facets,
enabled_feature_names, s)
# assimilate permissions from facets from None and all enabled features
def add_facet_permissions(facet):
for perm in facet.permissions:
check_add_assign_permission(workflow_name, permissions,
perm)
check_not_global_grant(perm[1], perm[2])
for (feature_name, qtk) in used_facets_fq:
# debug check that feature is enabled
assert feature_name in enabled_feature_names
facet = used_facets_fq[(feature_name, qtk)]
if facet is not None:
add_facet_permissions(facet)
# states
state_title = xas(s, "title")
naming.MSGIDS.add(state_title)
states.append(
State(
state_id,
state_title,
xas(s, "note"),
state_actions,
permissions,
parent_permissions,
xab(s, "obsolete"),
))
STATE_IDS = [s.id for s in states]
# transitions
for t in workflow.iterchildren("transition"):
title = xas(t, "title")
naming.MSGIDS.add(title)
# sources, empty string -> initial_state
sources = t.get("source").split() or [initial_state]
assert len(sources) == len(set(sources)), \
"Transition contains duplicate sources [%s]" % (sources)
for source in sources:
if source is not initial_state:
assert source in STATE_IDS, \
"Unknown transition source state [%s]" % (source)
# destination must be a valid state
destination = t.get("destination")
assert destination in STATE_IDS, \
"Unknown transition destination state [%s]" % (destination)
# optionals -- only set on kw IFF explicitly defined
kw = {}
for i in TRANS_ATTRS_OPTIONALS:
val = xas(t, i)
if not val:
# we let setting of defaults be handled downstream
continue
kw[i] = val
# data up-typing
#
# trigger
if "trigger" in kw:
kw["trigger"] = trigger_value_map[kw["trigger"]]
# roles -> permission - one-to-one per transition
roles = capi.schema.qualified_roles(kw.pop("roles", "").split())
if not is_zcml_permissionable(t):
assert not roles, "Workflow [%s] - non-permissionable transition " \
"does not allow @roles [%s]." % (workflow_name, roles) #!+RNC
kw["permission"] = None # None -> CheckerPublic
# !+CAN_EDIT_AS_DEFAULT_TRANSITION_PERMISSION(mr, oct-2011) this feature
# is functional (uncomment following elif clause) but as yet not enabled.
#
# Advantage would be that it would be easier to keep transitions
# permissions in sync with object permissions (set in state) as the
# majority of transition require exactly this as privilege; for the
# occassional transition needing a different privilege, the current
# transition.@roles mechanism may be used to make this explicit.
#
# Need to consider implications further; the zope_principal_role_map db
# table, that caches contextual roles for principals, should probably
# first be reworked to be db-less (as for zope_role_permission_map).
#
#elif not roles:
# # then as fallback transition permission use can modify object
# kw["permission"] = "bungeni.%s.Edit" % (workflow_name) # fallback permission
else:
# Dedicated permission for XML multi-source transition.
# Given that, irrespective of how sources are grouped into
# multi-source XML <transition> elements, there may be only *one*
# path from any given *source* to any given *destination* state,
# it suffices to use only the first source element + the destination
# to guarantee a unique identifier for an XML transition element.
tid = get_tid(sources[0] or "", destination)
pid = "bungeni.%s.wf.%s" % (workflow_name, tid)
if not ZCML_PROCESSED:
zcml_transition_permission(pid, title, roles)
# remember list of roles from xml
kw["_roles"] = roles
kw["permission"] = pid
# python resolvables
if "condition" in kw:
kw["condition"] = capi.get_workflow_condition(kw["condition"])
# numeric
if "order" in kw:
kw["order"] = float(kw["order"]) # ValueError if not numeric
# bool
if "require_confirmation" in kw:
try:
kw["require_confirmation"] = misc.as_bool(
kw["require_confirmation"])
assert kw["require_confirmation"] is not None #!+RNC
except:
raise ValueError("Invalid transition value "
'[require_confirmation="%s"]' %
(t.get("require_confirmation")))
# multiple-source transitions are really multiple "transition paths"
for source in sources:
args = (title, source, destination)
transitions.append(Transition(*args, **kw))
log.debug("[%s] adding transition [%s-%s] [%s]", workflow_name,
source or "", destination, kw)
wf = Workflow(workflow_name, workflow_features, workflow_facets, states,
transitions, global_grants, workflow_title,
workflow_description, note)
add_retract_transitions(wf)
return wf
def _load(workflow_name, workflow):
""" (workflow_name:str, workflow:etree_doc) -> Workflow
"""
workflow_title = xas(workflow, "title")
naming.MSGIDS.add(workflow_title)
workflow_description = xas(workflow, "description")
naming.MSGIDS.add(workflow_description)
transitions = []
states = []
note = xas(workflow, "note")
# initial_state, in XML indicated with a transition.@source=""
initial_state = None
ZCML_PROCESSED = bool(workflow_name in ZCML_WORKFLOWS_PROCESSED)
if not ZCML_PROCESSED:
ZCML_WORKFLOWS_PROCESSED.add(workflow_name)
ZCML_LINES.append(ZCML_INDENT)
ZCML_LINES.append(ZCML_INDENT)
ZCML_LINES.append("%s<!-- %s -->" % (ZCML_INDENT, workflow_name))
def validate_id(id, tag):
"""Ensure that ID values are unique within the same XML doc scope.
"""
m = "Invalid element <%s> id=%r in workflow %r" % (tag, id, workflow_name)
assert id not in validate_id.wuids, "%s -- id not unique in workflow document" % (m)
validate_id.wuids.add(id)
validate_id.wuids = set() # unique IDs in this XML workflow file
def get_from_state(state_id):
if state_id is None:
return
for state in states:
if state.id == state_id:
return state
raise ValueError("Invalid value: permissions_from_state=%r" % (state_id))
def check_not_global_grant(pid, role):
# ensure global and local assignments are distinct
# (global: global_pid_roles, workflow_name)
global_proles = global_pid_roles.get(pid, "")
assert role not in global_proles, ("Workflow [%s] may not mix "
"global and local granting of a same permission [%s] to a "
"same role [%s].") % (workflow_name, pid, role)
# permission_actions -> permissions for this type
for (key, permission_action) in capi.schema.qualified_permission_actions(
workflow_name, xas(workflow, "permission_actions", "").split()
):
pid = "bungeni.%s.%s" % (key, permission_action)
title = "%s %s" % (
permission_action, naming.split_camel(naming.model_name(key)))
# !+ add to a Workflow.defines_permissions list
ZCML_LINES.append(
'%s<permission id="%s" title="%s" />' % (ZCML_INDENT, pid, title))
provideUtility(Permission(pid), IPermission, pid)
# global grants
global_pid_roles = {} # {pid: [role]}
global_grants = get_permissions_from_allows(workflow_name, workflow)
for (setting, pid, role) in global_grants:
# for each global permission, build list of roles it is set to
global_pid_roles.setdefault(pid, []).append(role)
assert setting and pid and role, \
"Global grant must specify valid permission/role" #!+RNC
# !+ add to a Workflow.global_grants list
ZCML_LINES.append(
'%s<grant permission="%s" role="%s" />' % (ZCML_INDENT, pid, role))
# no real need to check that the permission and role of a global grant
# are properly registered in the system -- an error should be raised
# by the zcml if either is not defined.
rpm.grantPermissionToRole(pid, role, check=False)
for perm, roles in global_pid_roles.items():
# assert roles mix limitations for state permissions
assert_distinct_permission_scopes(perm, roles, workflow_name, "global grants")
# all workflow features (enabled AND disabled)
workflow_features = load_features(workflow_name, workflow)
enabled_feature_names = [None] + [
f.name for f in workflow_features if f.enabled ]
# !+EVENT_FEATURE_TYPES add each as enabled_feature_names, or extend the
# facet quailifer by feature_name(sub_type_key).facet_ref?
# workflow facets
workflow_facets = load_facets(workflow_name, workflow)
# states
for s in workflow.iterchildren("state"):
# @id
state_id = xas(s, "id")
assert state_id, "Workflow State must define @id" #!+RNC
validate_id(state_id, "state")
# @actions - transition-to-state actions
state_actions = []
for action_name in xas(s, "actions", "").split():
state_actions.append(capi.get_workflow_action(action_name))
# @permissions_from_state
permissions = [] # [ tuple(bool:int, permission:str, role:str) ]
# state.@permissions_from_state : to reduce repetition and enhance
# maintainibility of workflow XML files, a state may inherit ALL
# permissions defined by the specified state. NO other permissions
# may be specified by this state.
from_state = get_from_state(xas(s, "permissions_from_state"))
parent_permissions = xab(s, "parent_permissions")
if parent_permissions:
pass # no own permission definitions allowed
elif from_state:
# assimilate (no more no less) the state's permissions !+tuple, use same?
permissions[:] = from_state.permissions
else:
used_facets_fq = resolve_state_facets(
workflow_name, workflow_facets, enabled_feature_names, s)
# assimilate permissions from facets from None and all enabled features
def add_facet_permissions(facet):
for perm in facet.permissions:
check_add_assign_permission(workflow_name, permissions, perm)
check_not_global_grant(perm[1], perm[2])
for (feature_name, qtk) in used_facets_fq:
# debug check that feature is enabled
assert feature_name in enabled_feature_names
facet = used_facets_fq[(feature_name, qtk)]
if facet is not None:
add_facet_permissions(facet)
# states
state_title = xas(s, "title")
naming.MSGIDS.add(state_title)
states.append(
State(state_id, state_title,
xas(s, "note"),
state_actions, permissions,
parent_permissions,
xab(s, "obsolete"),
)
)
STATE_IDS = [ s.id for s in states ]
# transitions
for t in workflow.iterchildren("transition"):
title = xas(t, "title")
naming.MSGIDS.add(title)
# sources, empty string -> initial_state
sources = t.get("source").split() or [initial_state]
assert len(sources) == len(set(sources)), \
"Transition contains duplicate sources [%s]" % (sources)
for source in sources:
if source is not initial_state:
assert source in STATE_IDS, \
"Unknown transition source state [%s]" % (source)
# destination must be a valid state
destination = t.get("destination")
assert destination in STATE_IDS, \
"Unknown transition destination state [%s]" % (destination)
# optionals -- only set on kw IFF explicitly defined
kw = {}
for i in TRANS_ATTRS_OPTIONALS:
val = xas(t, i)
if not val:
# we let setting of defaults be handled downstream
continue
kw[i] = val
# data up-typing
#
# trigger
if "trigger" in kw:
kw["trigger"] = trigger_value_map[kw["trigger"]]
# roles -> permission - one-to-one per transition
roles = capi.schema.qualified_roles(kw.pop("roles", "").split())
if not is_zcml_permissionable(t):
assert not roles, "Workflow [%s] - non-permissionable transition " \
"does not allow @roles [%s]." % (workflow_name, roles) #!+RNC
kw["permission"] = None # None -> CheckerPublic
# !+CAN_EDIT_AS_DEFAULT_TRANSITION_PERMISSION(mr, oct-2011) this feature
# is functional (uncomment following elif clause) but as yet not enabled.
#
# Advantage would be that it would be easier to keep transitions
# permissions in sync with object permissions (set in state) as the
# majority of transition require exactly this as privilege; for the
# occassional transition needing a different privilege, the current
# transition.@roles mechanism may be used to make this explicit.
#
# Need to consider implications further; the zope_principal_role_map db
# table, that caches contextual roles for principals, should probably
# first be reworked to be db-less (as for zope_role_permission_map).
#
#elif not roles:
# # then as fallback transition permission use can modify object
# kw["permission"] = "bungeni.%s.Edit" % (workflow_name) # fallback permission
else:
# Dedicated permission for XML multi-source transition.
# Given that, irrespective of how sources are grouped into
# multi-source XML <transition> elements, there may be only *one*
# path from any given *source* to any given *destination* state,
# it suffices to use only the first source element + the destination
# to guarantee a unique identifier for an XML transition element.
tid = get_tid(sources[0] or "", destination)
pid = "bungeni.%s.wf.%s" % (workflow_name, tid)
if not ZCML_PROCESSED:
zcml_transition_permission(pid, title, roles)
# remember list of roles from xml
kw["_roles"] = roles
kw["permission"] = pid
# python resolvables
if "condition" in kw:
kw["condition"] = capi.get_workflow_condition(kw["condition"])
# numeric
if "order" in kw:
kw["order"] = float(kw["order"]) # ValueError if not numeric
# bool
if "require_confirmation" in kw:
try:
kw["require_confirmation"] = misc.as_bool(kw["require_confirmation"])
assert kw["require_confirmation"] is not None #!+RNC
except:
raise ValueError("Invalid transition value "
'[require_confirmation="%s"]' % (
t.get("require_confirmation")))
# multiple-source transitions are really multiple "transition paths"
for source in sources:
args = (title, source, destination)
transitions.append(Transition(*args, **kw))
log.debug("[%s] adding transition [%s-%s] [%s]",
workflow_name, source or "", destination, kw)
wf = Workflow(workflow_name,
workflow_features, workflow_facets, states, transitions, global_grants,
workflow_title, workflow_description, note)
add_retract_transitions(wf)
return wf
