osm_nbi/base_topic.py

   1 # -*- coding: utf-8 -*-
   2
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #    http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
  12 # implied.
  13 # See the License for the specific language governing permissions and
  14 # limitations under the License.
  15
  16 import logging
  17 from uuid import uuid4
  18 from http import HTTPStatus
  19 from time import time
  20 from osm_common.dbbase import deep_update_rfc7396
  21 from validation import validate_input, ValidationError, is_valid_uuid
  22
  23 __author__ = "Alfonso Tierno <alfonso.tiernosepulveda@telefonica.com>"
  24
  25
  26 class EngineException(Exception):
  27
  28     def __init__(self, message, http_code=HTTPStatus.BAD_REQUEST):
  29         self.http_code = http_code
  30         Exception.__init__(self, message)
  31
  32
  33 def get_iterable(input_var):
  34     """
  35     Returns an iterable, in case input_var is None it just returns an empty tuple
  36     :param input_var: can be a list, tuple or None
  37     :return: input_var or () if it is None
  38     """
  39     if input_var is None:
  40         return ()
  41     return input_var
  42
  43
  44 def versiontuple(v):
  45     """utility for compare dot separate versions. Fills with zeros to proper number comparison"""
  46     filled = []
  47     for point in v.split("."):
  48         filled.append(point.zfill(8))
  49     return tuple(filled)
  50
  51
  52 class BaseTopic:
  53     # static variables for all instance classes
  54     topic = None        # to_override
  55     topic_msg = None    # to_override
  56     schema_new = None   # to_override
  57     schema_edit = None  # to_override
  58     multiproject = True  # True if this Topic can be shared by several projects. Then it contains _admin.projects_read
  59
  60     # Alternative ID Fields for some Topics
  61     alt_id_field = {
  62         "projects": "name",
  63         "users": "username",
  64         "roles": "name"
  65     }
  66
  67     def __init__(self, db, fs, msg):
  68         self.db = db
  69         self.fs = fs
  70         self.msg = msg
  71         self.logger = logging.getLogger("nbi.engine")
  72
  73     @staticmethod
  74     def id_field(topic, value):
  75         """Returns ID Field for given topic and field value"""
  76         if topic in ["projects", "users"] and not is_valid_uuid(value):
  77             return BaseTopic.alt_id_field[topic]
  78         else:
  79             return "_id"
  80
  81     @staticmethod
  82     def _remove_envelop(indata=None):
  83         if not indata:
  84             return {}
  85         return indata
  86
  87     def _validate_input_new(self, input, force=False):
  88         """
  89         Validates input user content for a new entry. It uses jsonschema. Some overrides will use pyangbind
  90         :param input: user input content for the new topic
  91         :param force: may be used for being more tolerant
  92         :return: The same input content, or a changed version of it.
  93         """
  94         if self.schema_new:
  95             validate_input(input, self.schema_new)
  96         return input
  97
  98     def _validate_input_edit(self, input, force=False):
  99         """
 100         Validates input user content for an edition. It uses jsonschema. Some overrides will use pyangbind
 101         :param input: user input content for the new topic
 102         :param force: may be used for being more tolerant
 103         :return: The same input content, or a changed version of it.
 104         """
 105         if self.schema_edit:
 106             validate_input(input, self.schema_edit)
 107         return input
 108
 109     @staticmethod
 110     def _get_project_filter(session):
 111         """
 112         Generates a filter dictionary for querying database, so that only allowed items for this project can be
 113         addressed. Only propietary or public can be used. Allowed projects are at _admin.project_read/write. If it is
 114         not present or contains ANY mean public.
 115         :param session: contains:
 116             project_id: project list this session has rights to access. Can be empty, one or several
 117             set_project: items created will contain this project list
 118             force: True or False
 119             public: True, False or None
 120             method: "list", "show", "write", "delete"
 121             admin: True or False
 122         :return: dictionary with project filter
 123         """
 124         p_filter = {}
 125         project_filter_n = []
 126         project_filter = list(session["project_id"])
 127
 128         if session["method"] not in ("list", "delete"):
 129             if project_filter:
 130                 project_filter.append("ANY")
 131         elif session["public"] is not None:
 132             if session["public"]:
 133                 project_filter.append("ANY")
 134             else:
 135                 project_filter_n.append("ANY")
 136
 137         if session.get("PROJECT.ne"):
 138             project_filter_n.append(session["PROJECT.ne"])
 139
 140         if project_filter:
 141             if session["method"] in ("list", "show", "delete") or session.get("set_project"):
 142                 p_filter["_admin.projects_read.cont"] = project_filter
 143             else:
 144                 p_filter["_admin.projects_write.cont"] = project_filter
 145         if project_filter_n:
 146             if session["method"] in ("list", "show", "delete") or session.get("set_project"):
 147                 p_filter["_admin.projects_read.ncont"] = project_filter_n
 148             else:
 149                 p_filter["_admin.projects_write.ncont"] = project_filter_n
 150
 151         return p_filter
 152
 153     def check_conflict_on_new(self, session, indata):
 154         """
 155         Check that the data to be inserted is valid
 156         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 157         :param indata: data to be inserted
 158         :return: None or raises EngineException
 159         """
 160         pass
 161
 162     def check_conflict_on_edit(self, session, final_content, edit_content, _id):
 163         """
 164         Check that the data to be edited/uploaded is valid
 165         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 166         :param final_content: data once modified. This methdo may change it.
 167         :param edit_content: incremental data that contains the modifications to apply
 168         :param _id: internal _id
 169         :return: None or raises EngineException
 170         """
 171         if not self.multiproject:
 172             return
 173         # Change public status
 174         if session["public"] is not None:
 175             if session["public"] and "ANY" not in final_content["_admin"]["projects_read"]:
 176                 final_content["_admin"]["projects_read"].append("ANY")
 177                 final_content["_admin"]["projects_write"].clear()
 178             if not session["public"] and "ANY" in final_content["_admin"]["projects_read"]:
 179                 final_content["_admin"]["projects_read"].remove("ANY")
 180
 181         # Change project status
 182         if session.get("set_project"):
 183             for p in session["set_project"]:
 184                 if p not in final_content["_admin"]["projects_read"]:
 185                     final_content["_admin"]["projects_read"].append(p)
 186
 187     def check_unique_name(self, session, name, _id=None):
 188         """
 189         Check that the name is unique for this project
 190         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 191         :param name: name to be checked
 192         :param _id: If not None, ignore this entry that are going to change
 193         :return: None or raises EngineException
 194         """
 195         _filter = self._get_project_filter(session)
 196         _filter["name"] = name
 197         if _id:
 198             _filter["_id.neq"] = _id
 199         if self.db.get_one(self.topic, _filter, fail_on_empty=False, fail_on_more=False):
 200             raise EngineException("name '{}' already exists for {}".format(name, self.topic), HTTPStatus.CONFLICT)
 201
 202     @staticmethod
 203     def format_on_new(content, project_id=None, make_public=False):
 204         """
 205         Modifies content descriptor to include _admin
 206         :param content: descriptor to be modified
 207         :param project_id: if included, it add project read/write permissions. Can be None or a list
 208         :param make_public: if included it is generated as public for reading.
 209         :return: None, but content is modified
 210         """
 211         now = time()
 212         if "_admin" not in content:
 213             content["_admin"] = {}
 214         if not content["_admin"].get("created"):
 215             content["_admin"]["created"] = now
 216         content["_admin"]["modified"] = now
 217         if not content.get("_id"):
 218             content["_id"] = str(uuid4())
 219         if project_id is not None:
 220             if not content["_admin"].get("projects_read"):
 221                 content["_admin"]["projects_read"] = list(project_id)
 222                 if make_public:
 223                     content["_admin"]["projects_read"].append("ANY")
 224             if not content["_admin"].get("projects_write"):
 225                 content["_admin"]["projects_write"] = list(project_id)
 226
 227     @staticmethod
 228     def format_on_edit(final_content, edit_content):
 229         if final_content.get("_admin"):
 230             now = time()
 231             final_content["_admin"]["modified"] = now
 232
 233     def _send_msg(self, action, content):
 234         if self.topic_msg:
 235             content.pop("_admin", None)
 236             self.msg.write(self.topic_msg, action, content)
 237
 238     def check_conflict_on_del(self, session, _id, db_content):
 239         """
 240         Check if deletion can be done because of dependencies if it is not force. To override
 241         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 242         :param _id: internal _id
 243         :param db_content: The database content of this item _id
 244         :return: None if ok or raises EngineException with the conflict
 245         """
 246         pass
 247
 248     @staticmethod
 249     def _update_input_with_kwargs(desc, kwargs):
 250         """
 251         Update descriptor with the kwargs. It contains dot separated keys
 252         :param desc: dictionary to be updated
 253         :param kwargs: plain dictionary to be used for updating.
 254         :return: None, 'desc' is modified. It raises EngineException.
 255         """
 256         if not kwargs:
 257             return
 258         try:
 259             for k, v in kwargs.items():
 260                 update_content = desc
 261                 kitem_old = None
 262                 klist = k.split(".")
 263                 for kitem in klist:
 264                     if kitem_old is not None:
 265                         update_content = update_content[kitem_old]
 266                     if isinstance(update_content, dict):
 267                         kitem_old = kitem
 268                     elif isinstance(update_content, list):
 269                         kitem_old = int(kitem)
 270                     else:
 271                         raise EngineException(
 272                             "Invalid query string '{}'. Descriptor is not a list nor dict at '{}'".format(k, kitem))
 273                 update_content[kitem_old] = v
 274         except KeyError:
 275             raise EngineException(
 276                 "Invalid query string '{}'. Descriptor does not contain '{}'".format(k, kitem_old))
 277         except ValueError:
 278             raise EngineException("Invalid query string '{}'. Expected integer index list instead of '{}'".format(
 279                 k, kitem))
 280         except IndexError:
 281             raise EngineException(
 282                 "Invalid query string '{}'. Index '{}' out of  range".format(k, kitem_old))
 283
 284     def show(self, session, _id):
 285         """
 286         Get complete information on an topic
 287         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 288         :param _id: server internal id
 289         :return: dictionary, raise exception if not found.
 290         """
 291         filter_db = self._get_project_filter(session)
 292         # To allow project&user addressing by name AS WELL AS _id
 293         filter_db[BaseTopic.id_field(self.topic, _id)] = _id
 294         return self.db.get_one(self.topic, filter_db)
 295         # TODO transform data for SOL005 URL requests
 296         # TODO remove _admin if not admin
 297
 298     def get_file(self, session, _id, path=None, accept_header=None):
 299         """
 300         Only implemented for descriptor topics. Return the file content of a descriptor
 301         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 302         :param _id: Identity of the item to get content
 303         :param path: artifact path or "$DESCRIPTOR" or None
 304         :param accept_header: Content of Accept header. Must contain applition/zip or/and text/plain
 305         :return: opened file or raises an exception
 306         """
 307         raise EngineException("Method get_file not valid for this topic", HTTPStatus.INTERNAL_SERVER_ERROR)
 308
 309     def list(self, session, filter_q=None):
 310         """
 311         Get a list of the topic that matches a filter
 312         :param session: contains the used login username and working project
 313         :param filter_q: filter of data to be applied
 314         :return: The list, it can be empty if no one match the filter.
 315         """
 316         if not filter_q:
 317             filter_q = {}
 318
 319         filter_q.update(self._get_project_filter(session))
 320
 321         # TODO transform data for SOL005 URL requests. Transform filtering
 322         # TODO implement "field-type" query string SOL005
 323         return self.db.get_list(self.topic, filter_q)
 324
 325     def new(self, rollback, session, indata=None, kwargs=None, headers=None):
 326         """
 327         Creates a new entry into database.
 328         :param rollback: list to append created items at database in case a rollback may to be done
 329         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 330         :param indata: data to be inserted
 331         :param kwargs: used to override the indata descriptor
 332         :param headers: http request headers
 333         :return: _id: identity of the inserted data.
 334         """
 335         try:
 336             content = self._remove_envelop(indata)
 337
 338             # Override descriptor with query string kwargs
 339             self._update_input_with_kwargs(content, kwargs)
 340             content = self._validate_input_new(content, force=session["force"])
 341             self.check_conflict_on_new(session, content)
 342             self.format_on_new(content, project_id=session["project_id"], make_public=session["public"])
 343             _id = self.db.create(self.topic, content)
 344             rollback.append({"topic": self.topic, "_id": _id})
 345             self._send_msg("create", content)
 346             return _id
 347         except ValidationError as e:
 348             raise EngineException(e, HTTPStatus.UNPROCESSABLE_ENTITY)
 349
 350     def upload_content(self, session, _id, indata, kwargs, headers):
 351         """
 352         Only implemented for descriptor topics.  Used for receiving content by chunks (with a transaction_id header
 353         and/or gzip file. It will store and extract)
 354         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 355         :param _id : the database id of entry to be updated
 356         :param indata: http body request
 357         :param kwargs: user query string to override parameters. NOT USED
 358         :param headers:  http request headers
 359         :return: True package has is completely uploaded or False if partial content has been uplodaed.
 360             Raise exception on error
 361         """
 362         raise EngineException("Method upload_content not valid for this topic", HTTPStatus.INTERNAL_SERVER_ERROR)
 363
 364     def delete_list(self, session, filter_q=None):
 365         """
 366         Delete a several entries of a topic. This is for internal usage and test only, not exposed to NBI API
 367         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 368         :param filter_q: filter of data to be applied
 369         :return: The deleted list, it can be empty if no one match the filter.
 370         """
 371         # TODO add admin to filter, validate rights
 372         if not filter_q:
 373             filter_q = {}
 374         filter_q.update(self._get_project_filter(session))
 375         return self.db.del_list(self.topic, filter_q)
 376
 377     def delete_extra(self, session, _id, db_content):
 378         """
 379         Delete other things apart from database entry of a item _id.
 380         e.g.: other associated elements at database and other file system storage
 381         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 382         :param _id: server internal id
 383         :param db_content: The database content of the _id. It is already deleted when reached this method, but the
 384             content is needed in same cases
 385         :return: None if ok or raises EngineException with the problem
 386         """
 387         pass
 388
 389     def delete(self, session, _id, dry_run=False):
 390         """
 391         Delete item by its internal _id
 392         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 393         :param _id: server internal id
 394         :param dry_run: make checking but do not delete
 395         :return: dictionary with deleted item _id. It raises EngineException on error: not found, conflict, ...
 396         """
 397
 398         # To allow addressing projects and users by name AS WELL AS by _id
 399         filter_q = {BaseTopic.id_field(self.topic, _id): _id}
 400         item_content = self.db.get_one(self.topic, filter_q)
 401
 402         # TODO add admin to filter, validate rights
 403         # data = self.get_item(topic, _id)
 404         self.check_conflict_on_del(session, _id, item_content)
 405         if dry_run:
 406             return None
 407
 408         filter_q.update(self._get_project_filter(session))
 409         if self.multiproject and session["project_id"]:
 410             # remove reference from project_read. If not last delete
 411             self.db.set_one(self.topic, filter_q, update_dict=None,
 412                             pull={"_admin.projects_read": {"$in": session["project_id"]}})
 413             # try to delete if there is not any more reference from projects. Ignore if it is not deleted
 414             filter_q = {'_id': _id, '_admin.projects_read': [[], ["ANY"]]}
 415             v = self.db.del_one(self.topic, filter_q, fail_on_empty=False)
 416             if not v or not v["deleted"]:
 417                 return v
 418         else:
 419             v = self.db.del_one(self.topic, filter_q)
 420         self.delete_extra(session, _id, item_content)
 421         self._send_msg("deleted", {"_id": _id})
 422         return v
 423
 424     def edit(self, session, _id, indata=None, kwargs=None, content=None):
 425         """
 426         Change the content of an item
 427         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 428         :param _id: server internal id
 429         :param indata: contains the changes to apply
 430         :param kwargs: modifies indata
 431         :param content: original content of the item
 432         :return:
 433         """
 434         indata = self._remove_envelop(indata)
 435
 436         # Override descriptor with query string kwargs
 437         if kwargs:
 438             self._update_input_with_kwargs(indata, kwargs)
 439         try:
 440             if indata and session.get("set_project"):
 441                 raise EngineException("Cannot edit content and set to project (query string SET_PROJECT) at same time",
 442                                       HTTPStatus.UNPROCESSABLE_ENTITY)
 443             indata = self._validate_input_edit(indata, force=session["force"])
 444
 445             # TODO self._check_edition(session, indata, _id, force)
 446             if not content:
 447                 content = self.show(session, _id)
 448             deep_update_rfc7396(content, indata)
 449             self.check_conflict_on_edit(session, content, indata, _id=_id)
 450             self.format_on_edit(content, indata)
 451             # To allow project addressing by name AS WELL AS _id
 452             # self.db.replace(self.topic, _id, content)
 453             cid = content.get("_id")
 454             self.db.replace(self.topic, cid if cid else _id, content)
 455
 456             indata.pop("_admin", None)
 457             indata["_id"] = _id
 458             self._send_msg("edit", indata)
 459             return _id
 460         except ValidationError as e:
 461             raise EngineException(e, HTTPStatus.UNPROCESSABLE_ENTITY)