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basic_filter.py
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basic_filter.py
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import datetime as dt
from medallion.utils import common
class BasicFilter(object):
def __init__(self, filter_args):
self.filter_args = filter_args
@staticmethod
def _belongs_in_class(c, obj):
return c[0]["id"] == obj["id"]
@staticmethod
def _equivalence_partition_by_id(initial_results):
classes = []
for o in initial_results: # for each object
# find the class it is in
found = False
for c in classes:
if BasicFilter._belongs_in_class(c, o): # is it equivalent to this class?
c.append(o)
found = True
break
if not found: # it is in a new class
classes.append([o])
return classes
@staticmethod
def filter_by_id(data, id_):
id_ = id_.split(",")
match_objects = []
for obj in data:
if "id" in obj and any(s == obj["id"] for s in id_):
match_objects.append(obj)
return match_objects
@staticmethod
def filter_by_version(data, version):
# There can be more than one filter, using v_filter for looping through
# each filter. For example ?match[version]=first,last
match_objects = []
version_indicators = version.split(",")
if "all" in version_indicators:
# if "all" is in the list, just return everything
return data
actual_dates = [x for x in version_indicators if (x != "first" and x != "last")]
first = last = None
t_first = t_last = None
for obj in data:
time_of_obj = dt.datetime.strptime(obj["modified"], "%Y-%m-%dT%H:%M:%S.%fZ")
if first is None:
first = last = obj
t_first = time_of_obj
t_last = time_of_obj
else:
if time_of_obj < t_first:
first = obj
t_first = time_of_obj
elif time_of_obj > t_last:
last = obj
t_last = time_of_obj
if obj["modified"] in actual_dates:
match_objects.append(obj)
if "first" in version_indicators:
match_objects.append(first)
if "last" in version_indicators:
match_objects.append(last)
return match_objects
@staticmethod
def is_manifest_entry(x):
return "modified" not in x
@staticmethod
def filter_manifest_entries_by_version(data, version):
match_objects = []
version_indicators = version.split(",")
if "all" in version_indicators:
# if "all" is in the list, just return everything
return data
actual_dates = [x for x in version_indicators if (x != "first" and x != "last")]
for obj in data:
versions_returned = []
first = last = None
t_first = t_last = None
for t in obj["versions"]:
timestamp = dt.datetime.strptime(t, "%Y-%m-%dT%H:%M:%S.%fZ")
if first is None:
first = last = t
t_first = timestamp
t_last = timestamp
else:
if timestamp < t_first:
first = t
t_first = timestamp
elif timestamp > t_last:
last = t
t_last = timestamp
if t in actual_dates:
versions_returned.append(t)
if "first" in version_indicators:
versions_returned.append(first)
if "last" in version_indicators:
versions_returned.append(last)
if versions_returned:
obj["versions"] = versions_returned
match_objects.append(obj)
return match_objects
@staticmethod
def filter_by_type(data, type_):
type_ = type_.split(",")
match_objects = []
for obj in data:
if "type" in obj and any(s == obj["type"] for s in type_):
match_objects.append(obj)
elif "id" in obj and any(s == obj["id"].split("--")[0] for s in type_):
match_objects.append(obj)
return match_objects
def process_filter(self, data, allowed, manifest_info):
filtered_by_type = []
filtered_by_id = []
match_type = self.filter_args.get("match[type]")
if match_type and "type" in allowed:
filtered_by_type = self.filter_by_type(data, match_type)
match_id = self.filter_args.get("match[id]")
if match_id and "id" in allowed:
filtered_by_id = self.filter_by_id(data, match_id)
results = []
if filtered_by_type and filtered_by_id:
for type_match in filtered_by_type:
for id_match in filtered_by_id:
if type_match == id_match:
results.append(type_match)
elif match_type:
if filtered_by_type:
results.extend(filtered_by_type)
elif match_id:
if filtered_by_id:
results.extend(filtered_by_id)
else:
results = data
match_version = self.filter_args.get("match[version]")
if "version" in allowed:
if not match_version:
match_version = "last"
if self.is_manifest_entry(data[0]):
results = self.filter_manifest_entries_by_version(results, match_version)
else:
new_results = []
for bucket in BasicFilter._equivalence_partition_by_id(results):
new_results.extend(self.filter_by_version(bucket, match_version))
results = new_results
added_after_date = self.filter_args.get("added_after")
if added_after_date:
added_after_timestamp = common.convert_to_stix_datetime(added_after_date)
new_results = []
for obj in results:
info = None
for item in manifest_info:
if item["id"] == obj["id"]:
info = item
break
if info:
added_date_timestamp = common.convert_to_stix_datetime(info["date_added"])
if added_date_timestamp > added_after_timestamp:
new_results.append(obj)
return new_results
else:
return results