Bug 559 use schema_version 1.1 and encrypt passwds
[osm/NBI.git] / osm_nbi / engine.py
index c35617b..3cdacd9 100644 (file)
@@ -1,43 +1,44 @@
 # -*- coding: utf-8 -*-
 
 # -*- coding: utf-8 -*-
 
-import dbmongo
-import dbmemory
-import fslocal
-import msglocal
-import msgkafka
-import tarfile
-import yaml
-import json
 import logging
 import logging
-from random import choice as random_choice
-from uuid import uuid4
-from hashlib import sha256, md5
-from dbbase import DbException
-from fsbase import FsException
-from msgbase import MsgException
+from osm_common import dbmongo, dbmemory, fslocal, msglocal, msgkafka, version as common_version
+from osm_common.dbbase import DbException
+from osm_common.fsbase import FsException
+from osm_common.msgbase import MsgException
 from http import HTTPStatus
 from http import HTTPStatus
-from time import time
-from copy import deepcopy
+from base_topic import EngineException, versiontuple
+from admin_topics import UserTopic, ProjectTopic, VimAccountTopic, SdnTopic
+from descriptor_topics import VnfdTopic, NsdTopic, PduTopic
+from instance_topics import NsrTopic, VnfrTopic, NsLcmOpTopic
+from base64 import b64encode
+from os import urandom
 
 __author__ = "Alfonso Tierno <alfonso.tiernosepulveda@telefonica.com>"
 
 __author__ = "Alfonso Tierno <alfonso.tiernosepulveda@telefonica.com>"
-
-
-class EngineException(Exception):
-
-    def __init__(self, message, http_code=HTTPStatus.BAD_REQUEST):
-        self.http_code = http_code
-        Exception.__init__(self, message)
+min_common_version = "0.1.8"
 
 
 class Engine(object):
 
 
 class Engine(object):
+    map_from_topic_to_class = {
+        "vnfds": VnfdTopic,
+        "nsds": NsdTopic,
+        "pdus": PduTopic,
+        "nsrs": NsrTopic,
+        "vnfrs": VnfrTopic,
+        "nslcmops": NsLcmOpTopic,
+        "vim_accounts": VimAccountTopic,
+        "sdns": SdnTopic,
+        "users": UserTopic,
+        "projects": ProjectTopic,
+        # [NEW_TOPIC]: add an entry here
+    }
 
     def __init__(self):
 
     def __init__(self):
-        self.tokens = {}
         self.db = None
         self.fs = None
         self.msg = None
         self.config = None
         self.logger = logging.getLogger("nbi.engine")
         self.db = None
         self.fs = None
         self.msg = None
         self.config = None
         self.logger = logging.getLogger("nbi.engine")
+        self.map_topic = {}
 
     def start(self, config):
         """
 
     def start(self, config):
         """
@@ -46,6 +47,11 @@ class Engine(object):
         :return: None
         """
         self.config = config
         :return: None
         """
         self.config = config
+        # check right version of common
+        if versiontuple(common_version) < versiontuple(min_common_version):
+            raise EngineException("Not compatible osm/common version '{}'. Needed '{}' or higher".format(
+                common_version, min_common_version))
+
         try:
             if not self.db:
                 if config["database"]["driver"] == "mongo":
         try:
             if not self.db:
                 if config["database"]["driver"] == "mongo":
@@ -74,6 +80,10 @@ class Engine(object):
                 else:
                     raise EngineException("Invalid configuration param '{}' at '[message]':'driver'".format(
                         config["storage"]["driver"]))
                 else:
                     raise EngineException("Invalid configuration param '{}' at '[message]':'driver'".format(
                         config["storage"]["driver"]))
+
+            # create one class per topic
+            for topic, topic_class in self.map_from_topic_to_class.items():
+                self.map_topic[topic] = topic_class(self.db, self.fs, self.msg)
         except (DbException, FsException, MsgException) as e:
             raise EngineException(str(e), http_code=e.http_code)
 
         except (DbException, FsException, MsgException) as e:
             raise EngineException(str(e), http_code=e.http_code)
 
@@ -88,507 +98,116 @@ class Engine(object):
         except (DbException, FsException, MsgException) as e:
             raise EngineException(str(e), http_code=e.http_code)
 
         except (DbException, FsException, MsgException) as e:
             raise EngineException(str(e), http_code=e.http_code)
 
-    def authorize(self, token):
-        try:
-            if not token:
-                raise EngineException("Needed a token or Authorization http header",
-                                      http_code=HTTPStatus.UNAUTHORIZED)
-            if token not in self.tokens:
-                raise EngineException("Invalid token or Authorization http header",
-                                      http_code=HTTPStatus.UNAUTHORIZED)
-            session = self.tokens[token]
-            now = time()
-            if session["expires"] < now:
-                del self.tokens[token]
-                raise EngineException("Expired Token or Authorization http header",
-                                      http_code=HTTPStatus.UNAUTHORIZED)
-            return session
-        except EngineException:
-            if self.config["global"].get("test.user_not_authorized"):
-                return {"id": "fake-token-id-for-test",
-                        "project_id": self.config["global"].get("test.project_not_authorized", "admin"),
-                        "username": self.config["global"]["test.user_not_authorized"]}
-            else:
-                raise
-
-    def new_token(self, session, indata, remote):
-        now = time()
-        user_content = None
-
-        # Try using username/password
-        if indata.get("username"):
-            user_rows = self.db.get_list("users", {"username": indata.get("username")})
-            user_content = None
-            if user_rows:
-                user_content = user_rows[0]
-                salt = user_content["_admin"]["salt"]
-                shadow_password = sha256(indata.get("password", "").encode('utf-8') + salt.encode('utf-8')).hexdigest()
-                if shadow_password != user_content["password"]:
-                    user_content = None
-            if not user_content:
-                raise EngineException("Invalid username/password", http_code=HTTPStatus.UNAUTHORIZED)
-        elif session:
-            user_rows = self.db.get_list("users", {"username": session["username"]})
-            if user_rows:
-                user_content = user_rows[0]
-            else:
-                raise EngineException("Invalid token", http_code=HTTPStatus.UNAUTHORIZED)
-        else:
-            raise EngineException("Provide credentials: username/password or Authorization Bearer token",
-                                  http_code=HTTPStatus.UNAUTHORIZED)
-
-        token_id = ''.join(random_choice('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789')
-                           for _ in range(0, 32))
-        if indata.get("project_id"):
-            project_id = indata.get("project_id")
-            if project_id not in user_content["projects"]:
-                raise EngineException("project {} not allowed for this user".format(project_id),
-                                      http_code=HTTPStatus.UNAUTHORIZED)
-        else:
-            project_id = user_content["projects"][0]
-        if project_id == "admin":
-            session_admin = True
-        else:
-            project = self.db.get_one("projects", {"_id": project_id})
-            session_admin = project.get("admin", False)
-        new_session = {"issued_at": now, "expires": now+3600,
-                       "_id": token_id, "id": token_id, "project_id": project_id, "username": user_content["username"],
-                       "remote_port": remote.port, "admin": session_admin}
-        if remote.name:
-            new_session["remote_host"] = remote.name
-        elif remote.ip:
-            new_session["remote_host"] = remote.ip
-
-        self.tokens[token_id] = new_session
-        return deepcopy(new_session)
-
-    def get_token_list(self, session):
-        token_list = []
-        for token_id, token_value in self.tokens.items():
-            if token_value["username"] == session["username"]:
-                token_list.append(deepcopy(token_value))
-        return token_list
-
-    def get_token(self, session, token_id):
-        token_value = self.tokens.get(token_id)
-        if not token_value:
-            raise EngineException("token not found", http_code=HTTPStatus.NOT_FOUND)
-        if token_value["username"] != session["username"] and not session["admin"]:
-            raise EngineException("needed admin privileges", http_code=HTTPStatus.UNAUTHORIZED)
-        return token_value
-
-    def del_token(self, token_id):
-        try:
-            del self.tokens[token_id]
-            return "token '{}' deleted".format(token_id)
-        except KeyError:
-            raise EngineException("Token '{}' not found".format(token_id), http_code=HTTPStatus.NOT_FOUND)
-
-    @staticmethod
-    def _remove_envelop(item, indata=None):
-        """
-        Obtain the useful data removing the envelop. It goes throw the vnfd or nsd catalog and returns the
-        vnfd or nsd content
-        :param item: can be vnfds, nsds, users, projects,
-        :param indata: Content to be inspected
-        :return: the useful part of indata
-        """
-        clean_indata = indata
-        if not indata:
-            return {}
-        if item == "vnfds":
-            if clean_indata.get('vnfd:vnfd-catalog'):
-                clean_indata = clean_indata['vnfd:vnfd-catalog']
-            elif clean_indata.get('vnfd-catalog'):
-                clean_indata = clean_indata['vnfd-catalog']
-            if clean_indata.get('vnfd'):
-                if not isinstance(clean_indata['vnfd'], list) or len(clean_indata['vnfd']) != 1:
-                    raise EngineException("'vnfd' must be a list only one element")
-                clean_indata = clean_indata['vnfd'][0]
-        elif item == "nsds":
-            if clean_indata.get('nsd:nsd-catalog'):
-                clean_indata = clean_indata['nsd:nsd-catalog']
-            elif clean_indata.get('nsd-catalog'):
-                clean_indata = clean_indata['nsd-catalog']
-            if clean_indata.get('nsd'):
-                if not isinstance(clean_indata['nsd'], list) or len(clean_indata['nsd']) != 1:
-                    raise EngineException("'nsd' must be a list only one element")
-                clean_indata = clean_indata['nsd'][0]
-        return clean_indata
-
-    def _validate_new_data(self, session, item, indata):
-        if item == "users":
-            if not indata.get("username"):
-                raise EngineException("missing 'username'", HTTPStatus.UNPROCESSABLE_ENTITY)
-            if not indata.get("password"):
-                raise EngineException("missing 'password'", HTTPStatus.UNPROCESSABLE_ENTITY)
-            if not indata.get("projects"):
-                raise EngineException("missing 'projects'", HTTPStatus.UNPROCESSABLE_ENTITY)
-            # check username not exist
-            if self.db.get_one(item, {"username": indata.get("username")}, fail_on_empty=False, fail_on_more=False):
-                raise EngineException("username '{}' exist".format(indata["username"]), HTTPStatus.CONFLICT)
-        elif item == "projects":
-            if not indata.get("name"):
-                raise EngineException("missing 'name'")
-            # check name not exist
-            if self.db.get_one(item, {"name": indata.get("name")}, fail_on_empty=False, fail_on_more=False):
-                raise EngineException("name '{}' exist".format(indata["name"]), HTTPStatus.CONFLICT)
-        elif item == "vnfds" or item == "nsds":
-            filter = {"id": indata["id"]}
-            # TODO add admin to filter, validate rights
-            self._add_read_filter(session, item, filter)
-            if self.db.get_one(item, filter, fail_on_empty=False):
-                raise EngineException("{} with id '{}' already exist for this tenant".format(item[:-1], indata["id"]),
-                                      HTTPStatus.CONFLICT)
-
-            # TODO validate with pyangbind
-        elif item == "nsrs":
-            pass
-
-    def _format_new_data(self, session, item, indata, admin=None):
-        now = time()
-        if not "_admin" in indata:
-            indata["_admin"] = {}
-        indata["_admin"]["created"] = now
-        indata["_admin"]["modified"] = now
-        if item == "users":
-            _id = indata["username"]
-            salt = uuid4().hex
-            indata["_admin"]["salt"] =  salt
-            indata["password"] = sha256(indata["password"].encode('utf-8') + salt.encode('utf-8')).hexdigest()
-        elif item == "projects":
-            _id = indata["name"]
-        else:
-            _id = None
-            storage = None
-            if admin:
-                _id = admin.get("_id")
-                storage = admin.get("storage")
-            if not _id:
-                _id = str(uuid4())
-            if item == "vnfds" or item == "nsds":
-                if not indata["_admin"].get("projects_read"):
-                    indata["_admin"]["projects_read"] = [session["project_id"]]
-                if not indata["_admin"].get("projects_write"):
-                    indata["_admin"]["projects_write"] = [session["project_id"]]
-            if storage:
-                indata["_admin"]["storage"] = storage
-        indata["_id"] = _id
-
-    def _new_item_partial(self, session, item, indata, headers):
-        """
-        Used for recieve content by chunks (with a transaction_id header and/or gzip file. It will store and extract
-        :param session: session
-        :param item:
-        :param indata: http body request
-        :param headers:  http request headers
-        :return: a dict with::
-            _id: <transaction_id>
-            storage: <path>:  where it is saving
-            desc: <dict>: descriptor: Only present when all the content is received, extracted and read the descriptor
-        """
-        content_range_text = headers.get("Content-Range")
-        transaction_id = headers.get("Transaction-Id")
-        filename = headers.get("Content-Filename", "pkg")
-        # TODO change to Content-Disposition filename https://tools.ietf.org/html/rfc6266
-        expected_md5 = headers.get("Content-File-MD5")
-        compressed = None
-        if "application/gzip" in headers.get("Content-Type") or "application/x-gzip" in headers.get("Content-Type") or \
-                "application/zip" in headers.get("Content-Type"):
-            compressed = "gzip"
-        file_pkg = None
-        error_text = ""
-        try:
-            if content_range_text:
-                content_range = content_range_text.replace("-", " ").replace("/", " ").split()
-                if content_range[0] != "bytes":  # TODO check x<y not negative < total....
-                    raise IndexError()
-                start = int(content_range[1])
-                end = int(content_range[2]) + 1
-                total = int(content_range[3])
-                if len(indata) != end-start:
-                    raise EngineException("Mismatch between Content-Range header {}-{} and body length of {}".format(
-                        start, end-1, len(indata)), HTTPStatus.BAD_REQUEST)
-            else:
-                start = 0
-                total = end = len(indata)
-            if not transaction_id:
-                # generate transaction
-                transaction_id = str(uuid4())
-                self.fs.mkdir(transaction_id)
-                # control_file = open(self.storage["path"] + transaction_id + "/.osm.yaml", 'wb')
-                # control = {"received": 0}
-            elif not self.fs.file_exists(transaction_id):
-                raise EngineException("invalid Transaction-Id header", HTTPStatus.NOT_FOUND)
-            else:
-                pass
-                # control_file = open(self.storage["path"] + transaction_id + "/.osm.yaml", 'rw')
-                # control = yaml.load(control_file)
-                # control_file.seek(0, 0)
-            storage = self.fs.get_params()
-            storage["folder"] = transaction_id
-            storage["file"] = filename
-
-            file_path = (transaction_id, filename)
-            if self.fs.file_exists(file_path):
-                file_size = self.fs.file_size(file_path)
-            else:
-                file_size = 0
-            if file_size != start:
-                raise EngineException("invalid upload transaction sequence, expected '{}' but received '{}'".format(
-                    file_size, start), HTTPStatus.BAD_REQUEST)
-            file_pkg = self.fs.file_open(file_path, 'a+b')
-            file_pkg.write(indata)
-            if end != total:
-                return {"_id": transaction_id, "storage": storage}
-            if expected_md5:
-                file_pkg.seek(0, 0)
-                file_md5 = md5()
-                chunk_data = file_pkg.read(1024)
-                while chunk_data:
-                    file_md5.update(chunk_data)
-                    chunk_data = file_pkg.read(1024)
-                if expected_md5 != file_md5.hexdigest():
-                    raise EngineException("Error, MD5 mismatch", HTTPStatus.CONFLICT)
-            file_pkg.seek(0, 0)
-            if compressed == "gzip":
-                # TODO unzip,
-                storage["tarfile"] = filename
-                tar = tarfile.open(mode='r', fileobj=file_pkg)
-                descriptor_file_name = None
-                for tarinfo in tar:
-                    tarname = tarinfo.name
-                    tarname_path = tarname.split("/")
-                    if not tarname_path[0] or ".." in tarname_path:  # if start with "/" means absolute path
-                        raise EngineException("Absolute path or '..' are not allowed for package descriptor tar.gz")
-                    if len(tarname_path) == 1 and not tarinfo.isdir():
-                        raise EngineException("All files must be inside a dir for package descriptor tar.gz")
-                    if tarname.endswith(".yaml") or tarname.endswith(".json") or tarname.endswith(".yml"):
-                        storage["file"] = tarname_path[0]
-                        if len(tarname_path) == 2:
-                            if descriptor_file_name:
-                                raise EngineException("Found more than one descriptor file at package descriptor tar.gz")
-                            descriptor_file_name = tarname
-                if not descriptor_file_name:
-                    raise EngineException("Not found any descriptor file at package descriptor tar.gz")
-                self.fs.file_extract(tar, transaction_id)
-                with self.fs.file_open((transaction_id, descriptor_file_name), "r") as descriptor_file:
-                    content = descriptor_file.read()
-            else:
-                content = file_pkg.read()
-                tarname = ""
-
-            if tarname.endswith(".json"):
-                error_text = "Invalid json format "
-                indata = json.load(content)
-            else:
-                error_text = "Invalid yaml format "
-                indata = yaml.load(content)
-            return {"_id": transaction_id, "storage": storage, "desc": indata}
-        except EngineException:
-            raise
-        except IndexError:
-            raise EngineException("invalid Content-Range header format. Expected 'bytes start-end/total'",
-                                  HTTPStatus.BAD_REQUEST)
-        except IOError as e:
-            raise EngineException("invalid upload transaction sequence: '{}'".format(e), HTTPStatus.BAD_REQUEST)
-        except (ValueError, yaml.YAMLError) as e:
-            raise EngineException(error_text + str(e))
-        finally:
-            if file_pkg:
-                file_pkg.close()
-
-    def new_nsr(self, session, ns_request):
+    def new_item(self, rollback, session, topic, indata=None, kwargs=None, headers=None, force=False):
         """
         """
-        Creates a new nsr into database
+        Creates a new entry into database. For nsds and vnfds it creates an almost empty DISABLED  entry,
+        that must be completed with a call to method upload_content
+        :param rollback: list to append created items at database in case a rollback must to be done
         :param session: contains the used login username and working project
         :param session: contains the used login username and working project
-        :param ns_request: params to be used for the nsr
-        :return: nsr descriptor to be stored at database and the _id
+        :param topic: it can be: users, projects, vim_accounts, sdns, nsrs, nsds, vnfds
+        :param indata: data to be inserted
+        :param kwargs: used to override the indata descriptor
+        :param headers: http request headers
+        :param force: If True avoid some dependence checks
+        :return: _id: identity of the inserted data.
         """
         """
+        if topic not in self.map_topic:
+            raise EngineException("Unknown topic {}!!!".format(topic), HTTPStatus.INTERNAL_SERVER_ERROR)
+        return self.map_topic[topic].new(rollback, session, indata, kwargs, headers, force)
 
 
-        # look for nsr
-        nsd = self.get_item(session, "nsds", ns_request["nsdId"])
-        _id = str(uuid4())
-        nsr_descriptor = {
-            "name": ns_request["nsName"],
-            "name-ref": ns_request["nsName"],
-            "short-name": ns_request["nsName"],
-            "admin-status": "ENABLED",
-            "nsd": nsd,
-            "datacenter": ns_request["vimAccountId"],
-            "resource-orchestrator": "osmopenmano",
-            "description": ns_request.get("nsDescription", ""),
-            "constituent-vnfr-ref": ["TODO datacenter-id, vnfr-id"],
-
-            "operational-status": "init",    #  typedef ns-operational-
-            "config-status": "init",         #  typedef config-states
-            "detailed-status": "scheduled",
-
-            "orchestration-progress": {},  # {"networks": {"active": 0, "total": 0}, "vms": {"active": 0, "total": 0}},
-
-            "crete-time": time(),
-            "nsd-name-ref": nsd["name"],
-            "operational-events": [],   # "id", "timestamp", "description", "event",
-            "nsd-ref": nsd["id"],
-            "ns-instance-config-ref": _id,
-            "id": _id,
-
-            # "input-parameter": xpath, value,
-            "ssh-authorized-key": ns_request.get("key-pair-ref"),
-        }
-        ns_request["nsr_id"] = _id
-        return nsr_descriptor, _id
-
-    def new_item(self, session, item, indata={}, kwargs=None, headers={}):
+    def upload_content(self, session, topic, _id, indata, kwargs, headers, force=False):
         """
         """
-        Creates a new entry into database
+        Upload content for an already created entry (_id)
         :param session: contains the used login username and working project
         :param session: contains the used login username and working project
-        :param item: it can be: users, projects, vnfds, nsds, ...
+        :param topic: it can be: users, projects, vnfds, nsds,
+        :param _id: server id of the item
         :param indata: data to be inserted
         :param kwargs: used to override the indata descriptor
         :param headers: http request headers
         :param indata: data to be inserted
         :param kwargs: used to override the indata descriptor
         :param headers: http request headers
-        :return: _id, transaction_id: identity of the inserted data. or transaction_id if Content-Range is used
+        :param force: If True avoid some dependence checks
+        :return: _id: identity of the inserted data.
         """
         """
-        # TODO validate input. Check not exist at database
-        # TODO add admin and status
-
-        transaction = None
-        if headers.get("Content-Range") or "application/gzip" in headers.get("Content-Type") or \
-            "application/x-gzip" in headers.get("Content-Type") or "application/zip" in headers.get("Content-Type"):
-            if not indata:
-                raise EngineException("Empty payload")
-            transaction = self._new_item_partial(session, item, indata, headers)
-            if "desc" not in transaction:
-                return transaction["_id"], False
-            indata = transaction["desc"]
-
-        content = self._remove_envelop(item, indata)
-
-        # Override descriptor with query string kwargs
-        if kwargs:
-            try:
-                for k, v in kwargs.items():
-                    update_content = content
-                    kitem_old = None
-                    klist = k.split(".")
-                    for kitem in klist:
-                        if kitem_old is not None:
-                            update_content = update_content[kitem_old]
-                        if isinstance(update_content, dict):
-                            kitem_old = kitem
-                        elif isinstance(update_content, list):
-                            kitem_old = int(kitem)
-                        else:
-                            raise EngineException(
-                                "Invalid query string '{}'. Descriptor is not a list nor dict at '{}'".format(k, kitem))
-                    update_content[kitem_old] = v
-            except KeyError:
-                raise EngineException(
-                    "Invalid query string '{}'. Descriptor does not contain '{}'".format(k, kitem_old))
-            except ValueError:
-                raise EngineException("Invalid query string '{}'. Expected integer index list instead of '{}'".format(
-                    k, kitem))
-            except IndexError:
-                raise EngineException(
-                    "Invalid query string '{}'. Index '{}' out of  range".format(k, kitem_old))
-        if not indata:
-            raise EngineException("Empty payload")
-
-        if item == "nsrs":
-            # in this case the imput descriptor is not the data to be stored
-            ns_request = content
-            content, _id = self.new_nsr(session, ns_request)
-            transaction = {"_id": _id}
+        if topic not in self.map_topic:
+            raise EngineException("Unknown topic {}!!!".format(topic), HTTPStatus.INTERNAL_SERVER_ERROR)
+        return self.map_topic[topic].upload_content(session, _id, indata, kwargs, headers, force)
 
 
-        self._validate_new_data(session, item, content)
-        self._format_new_data(session, item, content, transaction)
-        _id = self.db.create(item, content)
-        if item == "nsrs":
-            self.msg.write("ns", "create", _id)
-        return _id, True
-
-    def _add_read_filter(self, session, item, filter):
-        if session["project_id"] == "admin":  # allows all
-            return filter
-        if item == "users":
-            filter["username"] = session["username"]
-        elif item == "vnfds" or item == "nsds":
-            filter["_admin.projects_read.cont"] = ["ANY", session["project_id"]]
-
-    def _add_delete_filter(self, session, item, filter):
-        if session["project_id"] != "admin" and item in ("users", "projects"):
-            raise EngineException("Only admin users can perform this task", http_code=HTTPStatus.FORBIDDEN)
-        if item == "users":
-            if filter.get("_id") == session["username"] or filter.get("username") == session["username"]:
-                raise EngineException("You cannot delete your own user", http_code=HTTPStatus.CONFLICT)
-        elif item == "project":
-            if filter.get("_id") == session["project_id"]:
-                raise EngineException("You cannot delete your own project", http_code=HTTPStatus.CONFLICT)
-        elif item in ("vnfds", "nsds") and session["project_id"] != "admin":
-            filter["_admin.projects_write.cont"] = ["ANY", session["project_id"]]
-
-    def get_item_list(self, session, item, filter={}):
+    def get_item_list(self, session, topic, filter_q=None):
         """
         Get a list of items
         :param session: contains the used login username and working project
         """
         Get a list of items
         :param session: contains the used login username and working project
-        :param item: it can be: users, projects, vnfds, nsds, ...
-        :param filter: filter of data to be applied
-        :return: The list, it can be empty if no one match the filter.
+        :param topic: it can be: users, projects, vnfds, nsds, ...
+        :param filter_q: filter of data to be applied
+        :return: The list, it can be empty if no one match the filter_q.
         """
         """
-        # TODO add admin to filter, validate rights
-        self._add_read_filter(session, item, filter)
-        return self.db.get_list(item, filter)
+        if topic not in self.map_topic:
+            raise EngineException("Unknown topic {}!!!".format(topic), HTTPStatus.INTERNAL_SERVER_ERROR)
+        return self.map_topic[topic].list(session, filter_q)
 
 
-    def get_item(self, session, item, _id):
+    def get_item(self, session, topic, _id):
         """
         """
-        Get complete information on an items
+        Get complete information on an item
         :param session: contains the used login username and working project
         :param session: contains the used login username and working project
-        :param item: it can be: users, projects, vnfds, nsds, ...
+        :param topic: it can be: users, projects, vnfds, nsds,
         :param _id: server id of the item
         :return: dictionary, raise exception if not found.
         """
         :param _id: server id of the item
         :return: dictionary, raise exception if not found.
         """
-        filter = {"_id": _id}
-        # TODO add admin to filter, validate rights
-        self._add_read_filter(session, item, filter)
-        return self.db.get_one(item, filter)
+        if topic not in self.map_topic:
+            raise EngineException("Unknown topic {}!!!".format(topic), HTTPStatus.INTERNAL_SERVER_ERROR)
+        return self.map_topic[topic].show(session, _id)
+
+    def get_file(self, session, topic, _id, path=None, accept_header=None):
+        """
+        Get descriptor package or artifact file content
+        :param session: contains the used login username and working project
+        :param topic: it can be: users, projects, vnfds, nsds,
+        :param _id: server id of the item
+        :param path: artifact path or "$DESCRIPTOR" or None
+        :param accept_header: Content of Accept header. Must contain applition/zip or/and text/plain
+        :return: opened file plus Accept format or raises an exception
+        """
+        if topic not in self.map_topic:
+            raise EngineException("Unknown topic {}!!!".format(topic), HTTPStatus.INTERNAL_SERVER_ERROR)
+        return self.map_topic[topic].get_file(session, _id, path, accept_header)
 
 
-    def del_item_list(self, session, item, filter={}):
+    def del_item_list(self, session, topic, _filter=None):
         """
         Delete a list of items
         :param session: contains the used login username and working project
         """
         Delete a list of items
         :param session: contains the used login username and working project
-        :param item: it can be: users, projects, vnfds, nsds, ...
-        :param filter: filter of data to be applied
-        :return: The deleted list, it can be empty if no one match the filter.
+        :param topic: it can be: users, projects, vnfds, nsds, ...
+        :param _filter: filter of data to be applied
+        :return: The deleted list, it can be empty if no one match the _filter.
         """
         """
-        # TODO add admin to filter, validate rights
-        self._add_read_filter(session, item, filter)
-        return self.db.del_list(item, filter)
+        if topic not in self.map_topic:
+            raise EngineException("Unknown topic {}!!!".format(topic), HTTPStatus.INTERNAL_SERVER_ERROR)
+        return self.map_topic[topic].delete_list(session, _filter)
 
 
-    def del_item(self, session, item, _id):
+    def del_item(self, session, topic, _id, force=False):
         """
         """
-        Get complete information on an items
+        Delete item by its internal id
         :param session: contains the used login username and working project
         :param session: contains the used login username and working project
-        :param item: it can be: users, projects, vnfds, nsds, ...
+        :param topic: it can be: users, projects, vnfds, nsds, ...
         :param _id: server id of the item
         :param _id: server id of the item
-        :return: dictionary, raise exception if not found.
+        :param force: indicates if deletion must be forced in case of conflict
+        :return: dictionary with deleted item _id. It raises exception if not found.
         """
         """
-        # TODO add admin to filter, validate rights
-        # data = self.get_item(item, _id)
-        filter = {"_id": _id}
-        self._add_delete_filter(session, item, filter)
-
-        if item == "nsrs":
-            desc = self.db.get_one(item, filter)
-            desc["_admin"]["to_delete"] = True
-            self.db.replace(item, _id, desc)   # TODO change to set_one
-            self.msg.write("ns", "delete", _id)
-            return {"deleted": 1}
+        if topic not in self.map_topic:
+            raise EngineException("Unknown topic {}!!!".format(topic), HTTPStatus.INTERNAL_SERVER_ERROR)
+        return self.map_topic[topic].delete(session, _id, force)
 
 
-        v = self.db.del_one(item, filter)
-        self.fs.file_delete(_id, ignore_non_exist=True)
-        if item == "nsrs":
-            self.msg.write("ns", "delete", _id)
-        return v
+    def edit_item(self, session, topic, _id, indata=None, kwargs=None, force=False):
+        """
+        Update an existing entry at database
+        :param session: contains the used login username and working project
+        :param topic: it can be: users, projects, vnfds, nsds, ...
+        :param _id: identifier to be updated
+        :param indata: data to be inserted
+        :param kwargs: used to override the indata descriptor
+        :param force: If True avoid some dependence checks
+        :return: dictionary, raise exception if not found.
+        """
+        if topic not in self.map_topic:
+            raise EngineException("Unknown topic {}!!!".format(topic), HTTPStatus.INTERNAL_SERVER_ERROR)
+        return self.map_topic[topic].edit(session, _id, indata, kwargs, force)
 
     def prune(self):
         """
 
     def prune(self):
         """
@@ -599,65 +218,62 @@ class Engine(object):
 
     def create_admin(self):
         """
 
     def create_admin(self):
         """
-        Creates a new user admin/admin into database. Only allowed if database is empty. Useful for initialization
-        :return: _id identity of the inserted data.
+        Creates a new user admin/admin into database if database is empty. Useful for initialization
+        :return: _id identity of the inserted data, or None
         """
         users = self.db.get_one("users", fail_on_empty=False, fail_on_more=False)
         if users:
         """
         users = self.db.get_one("users", fail_on_empty=False, fail_on_more=False)
         if users:
-            raise EngineException("Unauthorized. Database users is not empty", HTTPStatus.UNAUTHORIZED)
-        indata = {"username": "admin", "password": "admin", "projects": ["admin"]}
-        fake_session = {"project_id": "admin", "username": "admin"}
-        self._format_new_data(fake_session, "users", indata)
-        _id = self.db.create("users", indata)
+            return None
+            # raise EngineException("Unauthorized. Database users is not empty", HTTPStatus.UNAUTHORIZED)
+        user_desc = {"username": "admin", "password": "admin", "projects": ["admin"]}
+        fake_session = {"project_id": "admin", "username": "admin", "admin": True}
+        roolback_list = []
+        _id = self.map_topic["users"].new(roolback_list, fake_session, user_desc, force=True)
         return _id
 
         return _id
 
-    def edit_item(self, session, item, id, indata={}, kwargs=None):
+    def upgrade_db(self, current_version, target_version):
+        if not target_version or current_version == target_version:
+            return
+        if target_version == '1.0':
+            if not current_version:
+                # create database version
+                serial = urandom(32)
+                version_data = {
+                    "_id": 'version',               # Always 'version'
+                    "version_int": 1000,            # version number
+                    "version": '1.0',               # version text
+                    "date": "2018-10-25",           # version date
+                    "description": "added serial",  # changes in this version
+                    'status': 'ENABLED',            # ENABLED, DISABLED (migration in process), ERROR,
+                    'serial': b64encode(serial)
+                }
+                self.db.create("admin", version_data)
+                self.db.set_secret_key(serial)
+            # TODO add future migrations here
+
+        raise EngineException("Wrong database version '{}'. Expected '{}'"
+                              ". It cannot be up/down-grade".format(current_version, target_version),
+                              http_code=HTTPStatus.INTERNAL_SERVER_ERROR)
+
+    def init_db(self, target_version='1.0'):
         """
         """
-        Update an existing entry at database
-        :param session: contains the used login username and working project
-        :param item: it can be: users, projects, vnfds, nsds, ...
-        :param id: identity of entry to be updated
-        :param indata: data to be inserted
-        :param kwargs: used to override the indata descriptor
-        :return: dictionary, raise exception if not found.
+        Init database if empty. If not empty it checks that database version and migrates if needed
+        If empty, it creates a new user admin/admin at 'users' and a new entry at 'version'
+        :param target_version: check desired database version. Migrate to it if possible or raises exception
+        :return: None if ok, exception if error or if the version is different.
         """
 
         """
 
-        content = self.get_item(session, item, id)
-        if indata:
-            indata = self._remove_envelop(item, indata)
-            # TODO update content with with a deep-update
-
-        # Override descriptor with query string kwargs
-        if kwargs:
-            try:
-                for k, v in kwargs.items():
-                    update_content = content
-                    kitem_old = None
-                    klist = k.split(".")
-                    for kitem in klist:
-                        if kitem_old is not None:
-                            update_content = update_content[kitem_old]
-                        if isinstance(update_content, dict):
-                            kitem_old = kitem
-                        elif isinstance(update_content, list):
-                            kitem_old = int(kitem)
-                        else:
-                            raise EngineException(
-                                "Invalid query string '{}'. Descriptor is not a list nor dict at '{}'".format(k, kitem))
-                    update_content[kitem_old] = v
-            except KeyError:
-                raise EngineException(
-                    "Invalid query string '{}'. Descriptor does not contain '{}'".format(k, kitem_old))
-            except ValueError:
-                raise EngineException("Invalid query string '{}'. Expected integer index list instead of '{}'".format(
-                    k, kitem))
-            except IndexError:
-                raise EngineException(
-                    "Invalid query string '{}'. Index '{}' out of  range".format(k, kitem_old))
-
-        self._validate_new_data(session, item, content)
-        # self._format_new_data(session, item, content)
-        self.db.replace(item, id, content)
-        return id
+        version_data = self.db.get_one("admin", {"_id": "version"}, fail_on_empty=False, fail_on_more=True)
+        # check database status is ok
+        if version_data and version_data.get("status") != 'ENABLED':
+            raise EngineException("Wrong database status '{}'".format(
+                version_data["status"]), HTTPStatus.INTERNAL_SERVER_ERROR)
 
 
+        # check version
+        db_version = None if not version_data else version_data.get("version")
+        if db_version != target_version:
+            self.upgrade_db(db_version, target_version)
 
 
+        # create user admin if not exist
+        self.create_admin()
+        return