Bug 868 - Fixed
[osm/NBI.git] / 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 deep_get(target_dict, key_list):
34 """
35 Get a value from target_dict entering in the nested keys. If keys does not exist, it returns None
36 Example target_dict={a: {b: 5}}; key_list=[a,b] returns 5; both key_list=[a,b,c] and key_list=[f,h] return None
37 :param target_dict: dictionary to be read
38 :param key_list: list of keys to read from target_dict
39 :return: The wanted value if exist, None otherwise
40 """
41 for key in key_list:
42 if not isinstance(target_dict, dict) or key not in target_dict:
43 return None
44 target_dict = target_dict[key]
45 return target_dict
46
47
48 def get_iterable(input_var):
49 """
50 Returns an iterable, in case input_var is None it just returns an empty tuple
51 :param input_var: can be a list, tuple or None
52 :return: input_var or () if it is None
53 """
54 if input_var is None:
55 return ()
56 return input_var
57
58
59 def versiontuple(v):
60 """utility for compare dot separate versions. Fills with zeros to proper number comparison"""
61 filled = []
62 for point in v.split("."):
63 filled.append(point.zfill(8))
64 return tuple(filled)
65
66
67 class BaseTopic:
68 # static variables for all instance classes
69 topic = None # to_override
70 topic_msg = None # to_override
71 schema_new = None # to_override
72 schema_edit = None # to_override
73 multiproject = True # True if this Topic can be shared by several projects. Then it contains _admin.projects_read
74
75 default_quota = 500
76
77 # Alternative ID Fields for some Topics
78 alt_id_field = {
79 "projects": "name",
80 "users": "username",
81 "roles": "name"
82 }
83
84 def __init__(self, db, fs, msg, auth):
85 self.db = db
86 self.fs = fs
87 self.msg = msg
88 self.logger = logging.getLogger("nbi.engine")
89 self.auth = auth
90
91 @staticmethod
92 def id_field(topic, value):
93 """Returns ID Field for given topic and field value"""
94 if topic in BaseTopic.alt_id_field.keys() and not is_valid_uuid(value):
95 return BaseTopic.alt_id_field[topic]
96 else:
97 return "_id"
98
99 @staticmethod
100 def _remove_envelop(indata=None):
101 if not indata:
102 return {}
103 return indata
104
105 def check_quota(self, session):
106 """
107 Check whether topic quota is exceeded by the given project
108 Used by relevant topics' 'new' function to decide whether or not creation of the new item should be allowed
109 :param projects: projects (tuple) for which quota should be checked
110 :param override: boolean. If true, don't raise ValidationError even though quota be exceeded
111 :return: None
112 :raise:
113 DbException if project not found
114 ValidationError if quota exceeded and not overridden
115 """
116 if session["force"] or session["admin"]:
117 return
118 projects = session["project_id"]
119 for project in projects:
120 proj = self.auth.get_project(project)
121 pid = proj["_id"]
122 quota = proj.get("quotas", {}).get(self.topic, self.default_quota)
123 count = self.db.count(self.topic, {"_admin.projects_read": pid})
124 if count >= quota:
125 name = proj["name"]
126 raise ValidationError("{} quota ({}) exceeded for project {} ({})".format(self.topic, quota, name, pid))
127
128 def _validate_input_new(self, input, force=False):
129 """
130 Validates input user content for a new entry. It uses jsonschema. Some overrides will use pyangbind
131 :param input: user input content for the new topic
132 :param force: may be used for being more tolerant
133 :return: The same input content, or a changed version of it.
134 """
135 if self.schema_new:
136 validate_input(input, self.schema_new)
137 return input
138
139 def _validate_input_edit(self, input, force=False):
140 """
141 Validates input user content for an edition. It uses jsonschema. Some overrides will use pyangbind
142 :param input: user input content for the new topic
143 :param force: may be used for being more tolerant
144 :return: The same input content, or a changed version of it.
145 """
146 if self.schema_edit:
147 validate_input(input, self.schema_edit)
148 return input
149
150 @staticmethod
151 def _get_project_filter(session):
152 """
153 Generates a filter dictionary for querying database, so that only allowed items for this project can be
154 addressed. Only propietary or public can be used. Allowed projects are at _admin.project_read/write. If it is
155 not present or contains ANY mean public.
156 :param session: contains:
157 project_id: project list this session has rights to access. Can be empty, one or several
158 set_project: items created will contain this project list
159 force: True or False
160 public: True, False or None
161 method: "list", "show", "write", "delete"
162 admin: True or False
163 :return: dictionary with project filter
164 """
165 p_filter = {}
166 project_filter_n = []
167 project_filter = list(session["project_id"])
168
169 if session["method"] not in ("list", "delete"):
170 if project_filter:
171 project_filter.append("ANY")
172 elif session["public"] is not None:
173 if session["public"]:
174 project_filter.append("ANY")
175 else:
176 project_filter_n.append("ANY")
177
178 if session.get("PROJECT.ne"):
179 project_filter_n.append(session["PROJECT.ne"])
180
181 if project_filter:
182 if session["method"] in ("list", "show", "delete") or session.get("set_project"):
183 p_filter["_admin.projects_read.cont"] = project_filter
184 else:
185 p_filter["_admin.projects_write.cont"] = project_filter
186 if project_filter_n:
187 if session["method"] in ("list", "show", "delete") or session.get("set_project"):
188 p_filter["_admin.projects_read.ncont"] = project_filter_n
189 else:
190 p_filter["_admin.projects_write.ncont"] = project_filter_n
191
192 return p_filter
193
194 def check_conflict_on_new(self, session, indata):
195 """
196 Check that the data to be inserted is valid
197 :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
198 :param indata: data to be inserted
199 :return: None or raises EngineException
200 """
201 pass
202
203 def check_conflict_on_edit(self, session, final_content, edit_content, _id):
204 """
205 Check that the data to be edited/uploaded is valid
206 :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
207 :param final_content: data once modified. This method may change it.
208 :param edit_content: incremental data that contains the modifications to apply
209 :param _id: internal _id
210 :return: None or raises EngineException
211 """
212 if not self.multiproject:
213 return
214 # Change public status
215 if session["public"] is not None:
216 if session["public"] and "ANY" not in final_content["_admin"]["projects_read"]:
217 final_content["_admin"]["projects_read"].append("ANY")
218 final_content["_admin"]["projects_write"].clear()
219 if not session["public"] and "ANY" in final_content["_admin"]["projects_read"]:
220 final_content["_admin"]["projects_read"].remove("ANY")
221
222 # Change project status
223 if session.get("set_project"):
224 for p in session["set_project"]:
225 if p not in final_content["_admin"]["projects_read"]:
226 final_content["_admin"]["projects_read"].append(p)
227
228 def check_unique_name(self, session, name, _id=None):
229 """
230 Check that the name is unique for this project
231 :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
232 :param name: name to be checked
233 :param _id: If not None, ignore this entry that are going to change
234 :return: None or raises EngineException
235 """
236 if not self.multiproject:
237 _filter = {}
238 else:
239 _filter = self._get_project_filter(session)
240 _filter["name"] = name
241 if _id:
242 _filter["_id.neq"] = _id
243 if self.db.get_one(self.topic, _filter, fail_on_empty=False, fail_on_more=False):
244 raise EngineException("name '{}' already exists for {}".format(name, self.topic), HTTPStatus.CONFLICT)
245
246 @staticmethod
247 def format_on_new(content, project_id=None, make_public=False):
248 """
249 Modifies content descriptor to include _admin
250 :param content: descriptor to be modified
251 :param project_id: if included, it add project read/write permissions. Can be None or a list
252 :param make_public: if included it is generated as public for reading.
253 :return: op_id: operation id on asynchronous operation, None otherwise. In addition content is modified
254 """
255 now = time()
256 if "_admin" not in content:
257 content["_admin"] = {}
258 if not content["_admin"].get("created"):
259 content["_admin"]["created"] = now
260 content["_admin"]["modified"] = now
261 if not content.get("_id"):
262 content["_id"] = str(uuid4())
263 if project_id is not None:
264 if not content["_admin"].get("projects_read"):
265 content["_admin"]["projects_read"] = list(project_id)
266 if make_public:
267 content["_admin"]["projects_read"].append("ANY")
268 if not content["_admin"].get("projects_write"):
269 content["_admin"]["projects_write"] = list(project_id)
270 return None
271
272 @staticmethod
273 def format_on_edit(final_content, edit_content):
274 """
275 Modifies final_content to admin information upon edition
276 :param final_content: final content to be stored at database
277 :param edit_content: user requested update content
278 :return: operation id, if this edit implies an asynchronous operation; None otherwise
279 """
280 if final_content.get("_admin"):
281 now = time()
282 final_content["_admin"]["modified"] = now
283 return None
284
285 def _send_msg(self, action, content):
286 if self.topic_msg:
287 content.pop("_admin", None)
288 self.msg.write(self.topic_msg, action, content)
289
290 def check_conflict_on_del(self, session, _id, db_content):
291 """
292 Check if deletion can be done because of dependencies if it is not force. To override
293 :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
294 :param _id: internal _id
295 :param db_content: The database content of this item _id
296 :return: None if ok or raises EngineException with the conflict
297 """
298 pass
299
300 @staticmethod
301 def _update_input_with_kwargs(desc, kwargs):
302 """
303 Update descriptor with the kwargs. It contains dot separated keys
304 :param desc: dictionary to be updated
305 :param kwargs: plain dictionary to be used for updating.
306 :return: None, 'desc' is modified. It raises EngineException.
307 """
308 if not kwargs:
309 return
310 try:
311 for k, v in kwargs.items():
312 update_content = desc
313 kitem_old = None
314 klist = k.split(".")
315 for kitem in klist:
316 if kitem_old is not None:
317 update_content = update_content[kitem_old]
318 if isinstance(update_content, dict):
319 kitem_old = kitem
320 elif isinstance(update_content, list):
321 kitem_old = int(kitem)
322 else:
323 raise EngineException(
324 "Invalid query string '{}'. Descriptor is not a list nor dict at '{}'".format(k, kitem))
325 update_content[kitem_old] = v
326 except KeyError:
327 raise EngineException(
328 "Invalid query string '{}'. Descriptor does not contain '{}'".format(k, kitem_old))
329 except ValueError:
330 raise EngineException("Invalid query string '{}'. Expected integer index list instead of '{}'".format(
331 k, kitem))
332 except IndexError:
333 raise EngineException(
334 "Invalid query string '{}'. Index '{}' out of range".format(k, kitem_old))
335
336 def show(self, session, _id):
337 """
338 Get complete information on an topic
339 :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
340 :param _id: server internal id
341 :return: dictionary, raise exception if not found.
342 """
343 if not self.multiproject:
344 filter_db = {}
345 else:
346 filter_db = self._get_project_filter(session)
347 # To allow project&user addressing by name AS WELL AS _id
348 filter_db[BaseTopic.id_field(self.topic, _id)] = _id
349 return self.db.get_one(self.topic, filter_db)
350 # TODO transform data for SOL005 URL requests
351 # TODO remove _admin if not admin
352
353 def get_file(self, session, _id, path=None, accept_header=None):
354 """
355 Only implemented for descriptor topics. Return the file content of a descriptor
356 :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
357 :param _id: Identity of the item to get content
358 :param path: artifact path or "$DESCRIPTOR" or None
359 :param accept_header: Content of Accept header. Must contain applition/zip or/and text/plain
360 :return: opened file or raises an exception
361 """
362 raise EngineException("Method get_file not valid for this topic", HTTPStatus.INTERNAL_SERVER_ERROR)
363
364 def list(self, session, filter_q=None):
365 """
366 Get a list of the topic that matches a filter
367 :param session: contains the used login username and working project
368 :param filter_q: filter of data to be applied
369 :return: The list, it can be empty if no one match the filter.
370 """
371 if not filter_q:
372 filter_q = {}
373 if self.multiproject:
374 filter_q.update(self._get_project_filter(session))
375
376 # TODO transform data for SOL005 URL requests. Transform filtering
377 # TODO implement "field-type" query string SOL005
378 return self.db.get_list(self.topic, filter_q)
379
380 def new(self, rollback, session, indata=None, kwargs=None, headers=None):
381 """
382 Creates a new entry into database.
383 :param rollback: list to append created items at database in case a rollback may to be done
384 :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
385 :param indata: data to be inserted
386 :param kwargs: used to override the indata descriptor
387 :param headers: http request headers
388 :return: _id, op_id:
389 _id: identity of the inserted data.
390 op_id: operation id if this is asynchronous, None otherwise
391 """
392 try:
393 if self.multiproject:
394 self.check_quota(session)
395
396 content = self._remove_envelop(indata)
397
398 # Override descriptor with query string kwargs
399 self._update_input_with_kwargs(content, kwargs)
400 content = self._validate_input_new(content, force=session["force"])
401 self.check_conflict_on_new(session, content)
402 op_id = self.format_on_new(content, project_id=session["project_id"], make_public=session["public"])
403 _id = self.db.create(self.topic, content)
404 rollback.append({"topic": self.topic, "_id": _id})
405 if op_id:
406 content["op_id"] = op_id
407 self._send_msg("created", content)
408 return _id, op_id
409 except ValidationError as e:
410 raise EngineException(e, HTTPStatus.UNPROCESSABLE_ENTITY)
411
412 def upload_content(self, session, _id, indata, kwargs, headers):
413 """
414 Only implemented for descriptor topics. Used for receiving content by chunks (with a transaction_id header
415 and/or gzip file. It will store and extract)
416 :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
417 :param _id : the database id of entry to be updated
418 :param indata: http body request
419 :param kwargs: user query string to override parameters. NOT USED
420 :param headers: http request headers
421 :return: True package has is completely uploaded or False if partial content has been uplodaed.
422 Raise exception on error
423 """
424 raise EngineException("Method upload_content not valid for this topic", HTTPStatus.INTERNAL_SERVER_ERROR)
425
426 def delete_list(self, session, filter_q=None):
427 """
428 Delete a several entries of a topic. This is for internal usage and test only, not exposed to NBI API
429 :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
430 :param filter_q: filter of data to be applied
431 :return: The deleted list, it can be empty if no one match the filter.
432 """
433 # TODO add admin to filter, validate rights
434 if not filter_q:
435 filter_q = {}
436 if self.multiproject:
437 filter_q.update(self._get_project_filter(session))
438 return self.db.del_list(self.topic, filter_q)
439
440 def delete_extra(self, session, _id, db_content):
441 """
442 Delete other things apart from database entry of a item _id.
443 e.g.: other associated elements at database and other file system storage
444 :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
445 :param _id: server internal id
446 :param db_content: The database content of the _id. It is already deleted when reached this method, but the
447 content is needed in same cases
448 :return: None if ok or raises EngineException with the problem
449 """
450 pass
451
452 def delete(self, session, _id, dry_run=False):
453 """
454 Delete item by its internal _id
455 :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
456 :param _id: server internal id
457 :param dry_run: make checking but do not delete
458 :return: operation id (None if there is not operation), raise exception if error or not found, conflict, ...
459 """
460
461 # To allow addressing projects and users by name AS WELL AS by _id
462 filter_q = {BaseTopic.id_field(self.topic, _id): _id}
463 item_content = self.db.get_one(self.topic, filter_q)
464
465 # TODO add admin to filter, validate rights
466 # data = self.get_item(topic, _id)
467 self.check_conflict_on_del(session, _id, item_content)
468 if dry_run:
469 return None
470
471 if self.multiproject:
472 filter_q.update(self._get_project_filter(session))
473 if self.multiproject and session["project_id"]:
474 # remove reference from project_read. If not last delete
475 # if this topic is not part of session["project_id"] no midification at database is done and an exception
476 # is raised
477 self.db.set_one(self.topic, filter_q, update_dict=None,
478 pull={"_admin.projects_read": {"$in": session["project_id"]}})
479 # try to delete if there is not any more reference from projects. Ignore if it is not deleted
480 filter_q = {'_id': _id, '_admin.projects_read': [[], ["ANY"]]}
481 v = self.db.del_one(self.topic, filter_q, fail_on_empty=False)
482 if not v or not v["deleted"]:
483 return None
484 else:
485 self.db.del_one(self.topic, filter_q)
486 self.delete_extra(session, _id, item_content)
487 self._send_msg("deleted", {"_id": _id})
488 return None
489
490 def edit(self, session, _id, indata=None, kwargs=None, content=None):
491 """
492 Change the content of an item
493 :param session: contains "username", "admin", "force", "public", "project_id", "set_project"
494 :param _id: server internal id
495 :param indata: contains the changes to apply
496 :param kwargs: modifies indata
497 :param content: original content of the item
498 :return: op_id: operation id if this is processed asynchronously, None otherwise
499 """
500 indata = self._remove_envelop(indata)
501
502 # Override descriptor with query string kwargs
503 if kwargs:
504 self._update_input_with_kwargs(indata, kwargs)
505 try:
506 if indata and session.get("set_project"):
507 raise EngineException("Cannot edit content and set to project (query string SET_PROJECT) at same time",
508 HTTPStatus.UNPROCESSABLE_ENTITY)
509 indata = self._validate_input_edit(indata, force=session["force"])
510
511 # TODO self._check_edition(session, indata, _id, force)
512 if not content:
513 content = self.show(session, _id)
514 deep_update_rfc7396(content, indata)
515
516 # To allow project addressing by name AS WELL AS _id. Get the _id, just in case the provided one is a name
517 _id = content.get("_id") or _id
518
519 self.check_conflict_on_edit(session, content, indata, _id=_id)
520 op_id = self.format_on_edit(content, indata)
521
522 self.db.replace(self.topic, _id, content)
523
524 indata.pop("_admin", None)
525 if op_id:
526 indata["op_id"] = op_id
527 indata["_id"] = _id
528 self._send_msg("edited", indata)
529 return op_id
530 except ValidationError as e:
531 raise EngineException(e, HTTPStatus.UNPROCESSABLE_ENTITY)