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 osm_nbi.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         super(Exception, self).__init__(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 BaseTopic.alt_id_field.keys() 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 method 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         if not self.multiproject:
 196             _filter = {}
 197         else:
 198             _filter = self._get_project_filter(session)
 199         _filter["name"] = name
 200         if _id:
 201             _filter["_id.neq"] = _id
 202         if self.db.get_one(self.topic, _filter, fail_on_empty=False, fail_on_more=False):
 203             raise EngineException("name '{}' already exists for {}".format(name, self.topic), HTTPStatus.CONFLICT)
 204
 205     @staticmethod
 206     def format_on_new(content, project_id=None, make_public=False):
 207         """
 208         Modifies content descriptor to include _admin
 209         :param content: descriptor to be modified
 210         :param project_id: if included, it add project read/write permissions. Can be None or a list
 211         :param make_public: if included it is generated as public for reading.
 212         :return: op_id: operation id on asynchronous operation, None otherwise. In addition content is modified
 213         """
 214         now = time()
 215         if "_admin" not in content:
 216             content["_admin"] = {}
 217         if not content["_admin"].get("created"):
 218             content["_admin"]["created"] = now
 219         content["_admin"]["modified"] = now
 220         if not content.get("_id"):
 221             content["_id"] = str(uuid4())
 222         if project_id is not None:
 223             if not content["_admin"].get("projects_read"):
 224                 content["_admin"]["projects_read"] = list(project_id)
 225                 if make_public:
 226                     content["_admin"]["projects_read"].append("ANY")
 227             if not content["_admin"].get("projects_write"):
 228                 content["_admin"]["projects_write"] = list(project_id)
 229         return None
 230
 231     @staticmethod
 232     def format_on_edit(final_content, edit_content):
 233         """
 234         Modifies final_content to admin information upon edition
 235         :param final_content: final content to be stored at database
 236         :param edit_content: user requested update content
 237         :return: operation id, if this edit implies an asynchronous operation; None otherwise
 238         """
 239         if final_content.get("_admin"):
 240             now = time()
 241             final_content["_admin"]["modified"] = now
 242         return None
 243
 244     def _send_msg(self, action, content):
 245         if self.topic_msg:
 246             content.pop("_admin", None)
 247             self.msg.write(self.topic_msg, action, content)
 248
 249     def check_conflict_on_del(self, session, _id, db_content):
 250         """
 251         Check if deletion can be done because of dependencies if it is not force. To override
 252         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 253         :param _id: internal _id
 254         :param db_content: The database content of this item _id
 255         :return: None if ok or raises EngineException with the conflict
 256         """
 257         pass
 258
 259     @staticmethod
 260     def _update_input_with_kwargs(desc, kwargs):
 261         """
 262         Update descriptor with the kwargs. It contains dot separated keys
 263         :param desc: dictionary to be updated
 264         :param kwargs: plain dictionary to be used for updating.
 265         :return: None, 'desc' is modified. It raises EngineException.
 266         """
 267         if not kwargs:
 268             return
 269         try:
 270             for k, v in kwargs.items():
 271                 update_content = desc
 272                 kitem_old = None
 273                 klist = k.split(".")
 274                 for kitem in klist:
 275                     if kitem_old is not None:
 276                         update_content = update_content[kitem_old]
 277                     if isinstance(update_content, dict):
 278                         kitem_old = kitem
 279                     elif isinstance(update_content, list):
 280                         kitem_old = int(kitem)
 281                     else:
 282                         raise EngineException(
 283                             "Invalid query string '{}'. Descriptor is not a list nor dict at '{}'".format(k, kitem))
 284                 update_content[kitem_old] = v
 285         except KeyError:
 286             raise EngineException(
 287                 "Invalid query string '{}'. Descriptor does not contain '{}'".format(k, kitem_old))
 288         except ValueError:
 289             raise EngineException("Invalid query string '{}'. Expected integer index list instead of '{}'".format(
 290                 k, kitem))
 291         except IndexError:
 292             raise EngineException(
 293                 "Invalid query string '{}'. Index '{}' out of  range".format(k, kitem_old))
 294
 295     def show(self, session, _id):
 296         """
 297         Get complete information on an topic
 298         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 299         :param _id: server internal id
 300         :return: dictionary, raise exception if not found.
 301         """
 302         if not self.multiproject:
 303             filter_db = {}
 304         else:
 305             filter_db = self._get_project_filter(session)
 306         # To allow project&user addressing by name AS WELL AS _id
 307         filter_db[BaseTopic.id_field(self.topic, _id)] = _id
 308         return self.db.get_one(self.topic, filter_db)
 309         # TODO transform data for SOL005 URL requests
 310         # TODO remove _admin if not admin
 311
 312     def get_file(self, session, _id, path=None, accept_header=None):
 313         """
 314         Only implemented for descriptor topics. Return the file content of a descriptor
 315         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 316         :param _id: Identity of the item to get content
 317         :param path: artifact path or "$DESCRIPTOR" or None
 318         :param accept_header: Content of Accept header. Must contain applition/zip or/and text/plain
 319         :return: opened file or raises an exception
 320         """
 321         raise EngineException("Method get_file not valid for this topic", HTTPStatus.INTERNAL_SERVER_ERROR)
 322
 323     def list(self, session, filter_q=None):
 324         """
 325         Get a list of the topic that matches a filter
 326         :param session: contains the used login username and working project
 327         :param filter_q: filter of data to be applied
 328         :return: The list, it can be empty if no one match the filter.
 329         """
 330         if not filter_q:
 331             filter_q = {}
 332         if self.multiproject:
 333             filter_q.update(self._get_project_filter(session))
 334
 335         # TODO transform data for SOL005 URL requests. Transform filtering
 336         # TODO implement "field-type" query string SOL005
 337         return self.db.get_list(self.topic, filter_q)
 338
 339     def new(self, rollback, session, indata=None, kwargs=None, headers=None):
 340         """
 341         Creates a new entry into database.
 342         :param rollback: list to append created items at database in case a rollback may to be done
 343         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 344         :param indata: data to be inserted
 345         :param kwargs: used to override the indata descriptor
 346         :param headers: http request headers
 347         :return: _id, op_id:
 348             _id: identity of the inserted data.
 349              op_id: operation id if this is asynchronous, None otherwise
 350         """
 351         try:
 352             content = self._remove_envelop(indata)
 353
 354             # Override descriptor with query string kwargs
 355             self._update_input_with_kwargs(content, kwargs)
 356             content = self._validate_input_new(content, force=session["force"])
 357             self.check_conflict_on_new(session, content)
 358             op_id = self.format_on_new(content, project_id=session["project_id"], make_public=session["public"])
 359             _id = self.db.create(self.topic, content)
 360             rollback.append({"topic": self.topic, "_id": _id})
 361             if op_id:
 362                 content["op_id"] = op_id
 363             self._send_msg("create", content)
 364             return _id, op_id
 365         except ValidationError as e:
 366             raise EngineException(e, HTTPStatus.UNPROCESSABLE_ENTITY)
 367
 368     def upload_content(self, session, _id, indata, kwargs, headers):
 369         """
 370         Only implemented for descriptor topics.  Used for receiving content by chunks (with a transaction_id header
 371         and/or gzip file. It will store and extract)
 372         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 373         :param _id : the database id of entry to be updated
 374         :param indata: http body request
 375         :param kwargs: user query string to override parameters. NOT USED
 376         :param headers:  http request headers
 377         :return: True package has is completely uploaded or False if partial content has been uplodaed.
 378             Raise exception on error
 379         """
 380         raise EngineException("Method upload_content not valid for this topic", HTTPStatus.INTERNAL_SERVER_ERROR)
 381
 382     def delete_list(self, session, filter_q=None):
 383         """
 384         Delete a several entries of a topic. This is for internal usage and test only, not exposed to NBI API
 385         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 386         :param filter_q: filter of data to be applied
 387         :return: The deleted list, it can be empty if no one match the filter.
 388         """
 389         # TODO add admin to filter, validate rights
 390         if not filter_q:
 391             filter_q = {}
 392         if self.multiproject:
 393             filter_q.update(self._get_project_filter(session))
 394         return self.db.del_list(self.topic, filter_q)
 395
 396     def delete_extra(self, session, _id, db_content):
 397         """
 398         Delete other things apart from database entry of a item _id.
 399         e.g.: other associated elements at database and other file system storage
 400         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 401         :param _id: server internal id
 402         :param db_content: The database content of the _id. It is already deleted when reached this method, but the
 403             content is needed in same cases
 404         :return: None if ok or raises EngineException with the problem
 405         """
 406         pass
 407
 408     def delete(self, session, _id, dry_run=False):
 409         """
 410         Delete item by its internal _id
 411         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 412         :param _id: server internal id
 413         :param dry_run: make checking but do not delete
 414         :return: operation id (None if there is not operation), raise exception if error or not found, conflict, ...
 415         """
 416
 417         # To allow addressing projects and users by name AS WELL AS by _id
 418         filter_q = {BaseTopic.id_field(self.topic, _id): _id}
 419         item_content = self.db.get_one(self.topic, filter_q)
 420
 421         # TODO add admin to filter, validate rights
 422         # data = self.get_item(topic, _id)
 423         self.check_conflict_on_del(session, _id, item_content)
 424         if dry_run:
 425             return None
 426
 427         if self.multiproject:
 428             filter_q.update(self._get_project_filter(session))
 429         if self.multiproject and session["project_id"]:
 430             # remove reference from project_read. If not last delete
 431             # if this topic is not part of session["project_id"] no midification at database is done and an exception
 432             # is raised
 433             self.db.set_one(self.topic, filter_q, update_dict=None,
 434                             pull={"_admin.projects_read": {"$in": session["project_id"]}})
 435             # try to delete if there is not any more reference from projects. Ignore if it is not deleted
 436             filter_q = {'_id': _id, '_admin.projects_read': [[], ["ANY"]]}
 437             v = self.db.del_one(self.topic, filter_q, fail_on_empty=False)
 438             if not v or not v["deleted"]:
 439                 return None
 440         else:
 441             self.db.del_one(self.topic, filter_q)
 442         self.delete_extra(session, _id, item_content)
 443         self._send_msg("deleted", {"_id": _id})
 444         return None
 445
 446     def edit(self, session, _id, indata=None, kwargs=None, content=None):
 447         """
 448         Change the content of an item
 449         :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
 450         :param _id: server internal id
 451         :param indata: contains the changes to apply
 452         :param kwargs: modifies indata
 453         :param content: original content of the item
 454         :return: op_id: operation id if this is processed asynchronously, None otherwise
 455         """
 456         indata = self._remove_envelop(indata)
 457
 458         # Override descriptor with query string kwargs
 459         if kwargs:
 460             self._update_input_with_kwargs(indata, kwargs)
 461         try:
 462             if indata and session.get("set_project"):
 463                 raise EngineException("Cannot edit content and set to project (query string SET_PROJECT) at same time",
 464                                       HTTPStatus.UNPROCESSABLE_ENTITY)
 465             indata = self._validate_input_edit(indata, force=session["force"])
 466
 467             # TODO self._check_edition(session, indata, _id, force)
 468             if not content:
 469                 content = self.show(session, _id)
 470             deep_update_rfc7396(content, indata)
 471
 472             # To allow project addressing by name AS WELL AS _id. Get the _id, just in case the provided one is a name
 473             _id = content.get("_id") or _id
 474
 475             self.check_conflict_on_edit(session, content, indata, _id=_id)
 476             op_id = self.format_on_edit(content, indata)
 477
 478             self.db.replace(self.topic, _id, content)
 479
 480             indata.pop("_admin", None)
 481             if op_id:
 482                 indata["op_id"] = op_id
 483             indata["_id"] = _id
 484             self._send_msg("edit", indata)
 485             return op_id
 486         except ValidationError as e:
 487             raise EngineException(e, HTTPStatus.UNPROCESSABLE_ENTITY)