ui: fixed exporting/importing rules

When exporting rules, use rfc3339 format for the Created field.
We were exporting it as timestamp, which caused issues when
importing the rules.

Related:
 58aa979
 issue #1140
(cherry picked from commit 552aed5)

Author: gustavo-iniguez-goya

ui/opensnitch/rules.py

@@ -7,9 +7,15 @@
 
 import os
 import json
+from slugify import slugify
 from datetime import datetime
 from google.protobuf.json_format import MessageToJson, Parse
 
+DefaultRulesPath = "/etc/opensnitchd/rules"
+
+# date format displayed on the GUI (created column)
+DBDateFieldFormat = "%Y-%m-%d %H:%M:%S"
+
 class Rule():
     def __init__(self):
         pass
@@ -41,7 +47,7 @@ def new_from_records(records):
         created = int(datetime.now().timestamp())
         if records.value(RuleFields.Created) != "":
             created = int(datetime.strptime(
-                records.value(RuleFields.Created), "%Y-%m-%d %H:%M:%S"
+                records.value(RuleFields.Created), DBDateFieldFormat
             ).timestamp())
         rule.created = created
 
@@ -77,14 +83,14 @@ def add(self, time, node, name, description, enabled, precedence, nolog, action,
     def add_rules(self, addr, rules):
         try:
             for _,r in enumerate(rules):
-                self.add(datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
+                self.add(datetime.now().strftime(DBDateFieldFormat),
                          addr,
                          r.name, r.description, str(r.enabled),
                          str(r.precedence), str(r.nolog), r.action, r.duration,
                          r.operator.type,
                          str(r.operator.sensitive),
                          r.operator.operand, r.operator.data,
-                         str(datetime.fromtimestamp(r.created).strftime("%Y-%m-%d %H:%M:%S")))
+                         str(datetime.fromtimestamp(r.created).strftime(DBDateFieldFormat)))
 
             return True
         except Exception as e:
@@ -135,6 +141,12 @@ def update_time(self, time, name, addr):
                         action_on_conflict="OR REPLACE"
                         )
 
+    def _timestamp_to_rfc3339(self, time):
+        """converts timestamp to rfc3339 format"""
+        return "{0}Z".format(
+            datetime.fromtimestamp(time).isoformat(timespec='microseconds')
+        )
+
     def rule_to_json(self, node, rule_name):
         try:
             records = self._db.get_rule(rule_name, node)
@@ -146,16 +158,33 @@ def rule_to_json(self, node, rule_name):
             # exclude this field when exporting to json
             tempRule = MessageToJson(rule)
             jRule = json.loads(tempRule)
-            jRule['created'] = "{0}Z".format(
-                datetime.fromtimestamp(rule.created).isoformat(timespec='microseconds')
-            )
+            jRule['created'] = self._timestamp_to_rfc3339(rule.created)
             return json.dumps(jRule, indent="    ")
         except Exception as e:
             print("rule_to_json() exception:", e)
             return None
 
+    def _export_rule_common(self, node, records, outdir):
+        try:
+            rule = Rule.new_from_records(records)
+            rulename = rule.name
+            if ".json" not in rulename:
+                rulename = rulename + ".json"
+            with open(outdir  + "/" + rulename, 'w') as jsfile:
+                actual_json_text = MessageToJson(rule)
+                jRule = json.loads(actual_json_text)
+                jRule['created'] = self._timestamp_to_rfc3339(rule.created)
+                actual_json_text = json.dumps(jRule, indent="    ")
+                jsfile.write( actual_json_text )
+
+            return True
+        except Exception as e:
+            print(self.LOG_TAG, "export_rules(", node, outdir, ") exception:", e)
+
+        return False
+
     def export_rule(self, node, rule_name, outdir):
-        """Gets the the rule from the DB and writes it out to a directory.
+        """Gets the rule from the DB and writes it out to a directory.
         A new directory per node will be created.
         """
         try:
@@ -164,51 +193,38 @@ def export_rule(self, node, rule_name, outdir):
                 print("export_rule() get_error 2:", records)
                 return False
 
-            rule = Rule.new_from_records(records)
-            rulesdir = outdir + "/" + node
+            rulesdir = outdir + "/" + slugify(node)
             try:
                 os.makedirs(rulesdir, 0o700)
             except Exception as e:
                 print("exception creating dirs:", e)
-            rulename = rule.name
-            if ".json" not in rulename:
-                rulename = rulename + ".json"
-            with open(rulesdir  + "/" + rulename, 'w') as jsfile:
-                actual_json_text = MessageToJson(rule)
-                jsfile.write( actual_json_text )
 
-            return True
+            return self._export_rule_common(node, records, rulesdir)
+
         except Exception as e:
-            print(self.LOG_TAG, "export_rules(", node, outdir, ") exception:", e)
+            print(self.LOG_TAG, "export_rules(", node, rulesdir, ") exception:", e)
 
         return False
 
     def export_rules(self, node, outdir):
-        """Gets the the rules from the DB and writes them out to a directory.
+        """Gets the rules from the DB and writes them out to a directory.
         A new directory per node will be created.
         """
         records = self._db.get_rules(node)
         if records == None:
             return False
 
+        rulesdir = outdir + "/" + slugify(node)
+        try:
+            os.makedirs(rulesdir, 0o700)
+        except Exception as e:
+            print("exception creating dirs:", e)
         try:
             while records.next() != False:
-                rule = Rule.new_from_records(records)
-
-                rulesdir = outdir + "/" + node
-                try:
-                    os.makedirs(rulesdir, 0o700)
-                except:
-                    pass
-                rulename = rule.name
-                if ".json" not in rulename:
-                    rulename = rulename + ".json"
-                with open(rulesdir  + "/" + rulename, 'w') as jsfile:
-                    actual_json_text = MessageToJson(rule)
-                    jsfile.write( actual_json_text )
+                self._export_rule_common(node, records, rulesdir)
 
         except Exception as e:
-            print(self.LOG_TAG, "export_rules(", node, outdir, ") exception:", e)
+            print(self.LOG_TAG, "export_rules(", node, rulesdir, ") exception:", e)
             return False
 
         return True
@@ -222,7 +238,20 @@ def import_rules(self, rulesdir):
             for rulename in os.listdir(rulesdir):
                 with open(rulesdir  + "/" + rulename, 'r') as f:
                     jsrule = f.read()
-                    pb_rule = Parse(text=jsrule, message=ui_pb2.Rule(), ignore_unknown_fields=True)
+                    # up until v1.6.5/v1.7.0, 'created' field was exported as timestamp.
+                    # since > v1.6.5 it's exported in rfc3339 format, so if we fail to
+                    # parse the rule, we'll try to convert the 'created' value from
+                    # timestamp to rfc3339.
+                    try:
+                        pb_rule = Parse(text=jsrule, message=ui_pb2.Rule(), ignore_unknown_fields=True)
+                    except:
+                        jRule = json.loads(jsrule)
+                        created = int(datetime.strptime(
+                            jRule['created'], "%Y-%m-%dT%H:%M:%S.%fZ"
+                        ).timestamp())
+                        jRule['created'] = created
+                        jsrule = json.dumps(jRule)
+                        pb_rule = Parse(text=jsrule, message=ui_pb2.Rule(), ignore_unknown_fields=True)
                     rules.append(pb_rule)
 
             return rules