1 # SPDX-License-Identifier: GPL-3.0-or-later
3 # This file is part of Nominatim. (https://nominatim.org)
5 # Copyright (C) 2023 by the Nominatim developer community.
6 # For a full list of authors see the git log.
8 Complex datatypes used by the Nominatim API.
10 from typing import Optional, Union, Tuple, NamedTuple, TypeVar, Type, Dict, \
12 from collections import abc
16 from struct import unpack
17 from binascii import unhexlify
19 from nominatim.errors import UsageError
21 # pylint: disable=no-member,too-many-boolean-expressions,too-many-instance-attributes
23 @dataclasses.dataclass
25 """ Reference an object by Nominatim's internal ID.
30 @dataclasses.dataclass
32 """ Reference by the OSM ID and potentially the basic category.
36 osm_class: Optional[str] = None
38 def __post_init__(self) -> None:
39 if self.osm_type not in ('N', 'W', 'R'):
40 raise ValueError(f"Illegal OSM type '{self.osm_type}'. Must be one of N, W, R.")
43 PlaceRef = Union[PlaceID, OsmID]
46 class Point(NamedTuple):
47 """ A geographic point in WGS84 projection.
54 def lat(self) -> float:
55 """ Return the latitude of the point.
61 def lon(self) -> float:
62 """ Return the longitude of the point.
67 def to_geojson(self) -> str:
68 """ Return the point in GeoJSON format.
70 return f'{{"type": "Point","coordinates": [{self.x}, {self.y}]}}'
74 def from_wkb(wkb: Union[str, bytes]) -> 'Point':
75 """ Create a point from EWKB as returned from the database.
77 if isinstance(wkb, str):
80 raise ValueError(f"Point wkb has unexpected length {len(wkb)}")
82 gtype, srid, x, y = unpack('>iidd', wkb[1:])
84 gtype, srid, x, y = unpack('<iidd', wkb[1:])
86 raise ValueError("WKB has unknown endian value.")
88 if gtype != 0x20000001:
89 raise ValueError("WKB must be a point geometry.")
91 raise ValueError("Only WGS84 WKB supported.")
97 def from_param(inp: Any) -> 'Point':
98 """ Create a point from an input parameter. The parameter
99 may be given as a point, a string or a sequence of
100 strings or floats. Raises a UsageError if the format is
103 if isinstance(inp, Point):
107 if isinstance(inp, str):
109 elif isinstance(inp, abc.Sequence):
113 raise UsageError('Point parameter needs 2 coordinates.')
115 x, y = filter(math.isfinite, map(float, seq))
116 except ValueError as exc:
117 raise UsageError('Point parameter needs to be numbers.') from exc
119 if x < -180.0 or x > 180.0 or y < -90.0 or y > 90.0:
120 raise UsageError('Point coordinates invalid.')
125 def to_wkt(self) -> str:
126 """ Return the WKT representation of the point.
128 return f'POINT({self.x} {self.y})'
132 AnyPoint = Union[Point, Tuple[float, float]]
134 WKB_BBOX_HEADER_LE = b'\x01\x03\x00\x00\x20\xE6\x10\x00\x00\x01\x00\x00\x00\x05\x00\x00\x00'
135 WKB_BBOX_HEADER_BE = b'\x00\x20\x00\x00\x03\x00\x00\x10\xe6\x00\x00\x00\x01\x00\x00\x00\x05'
138 """ A bounding box in WSG84 projection.
140 The coordinates are available as an array in the 'coord'
141 property in the order (minx, miny, maxx, maxy).
143 def __init__(self, minx: float, miny: float, maxx: float, maxy: float) -> None:
144 self.coords = (minx, miny, maxx, maxy)
148 def minlat(self) -> float:
149 """ Southern-most latitude, corresponding to the minimum y coordinate.
151 return self.coords[1]
155 def maxlat(self) -> float:
156 """ Northern-most latitude, corresponding to the maximum y coordinate.
158 return self.coords[3]
162 def minlon(self) -> float:
163 """ Western-most longitude, corresponding to the minimum x coordinate.
165 return self.coords[0]
169 def maxlon(self) -> float:
170 """ Eastern-most longitude, corresponding to the maximum x coordinate.
172 return self.coords[2]
176 def area(self) -> float:
177 """ Return the area of the box in WGS84.
179 return (self.coords[2] - self.coords[0]) * (self.coords[3] - self.coords[1])
182 def contains(self, pt: Point) -> bool:
183 """ Check if the point is inside or on the boundary of the box.
185 return self.coords[0] <= pt[0] and self.coords[1] <= pt[1]\
186 and self.coords[2] >= pt[0] and self.coords[3] >= pt[1]
189 def to_wkt(self) -> str:
190 """ Return the WKT representation of the Bbox. This
191 is a simple polygon with four points.
193 return 'POLYGON(({0} {1},{0} {3},{2} {3},{2} {1},{0} {1}))'\
194 .format(*self.coords) # pylint: disable=consider-using-f-string
198 def from_wkb(wkb: Union[None, str, bytes]) -> 'Optional[Bbox]':
199 """ Create a Bbox from a bounding box polygon as returned by
200 the database. Return s None if the input value is None.
205 if isinstance(wkb, str):
209 raise ValueError("WKB must be a bounding box polygon")
210 if wkb.startswith(WKB_BBOX_HEADER_LE):
211 x1, y1, _, _, x2, y2 = unpack('<dddddd', wkb[17:65])
212 elif wkb.startswith(WKB_BBOX_HEADER_BE):
213 x1, y1, _, _, x2, y2 = unpack('>dddddd', wkb[17:65])
215 raise ValueError("WKB has wrong header")
217 return Bbox(min(x1, x2), min(y1, y2), max(x1, x2), max(y1, y2))
221 def from_point(pt: Point, buffer: float) -> 'Bbox':
222 """ Return a Bbox around the point with the buffer added to all sides.
224 return Bbox(pt[0] - buffer, pt[1] - buffer,
225 pt[0] + buffer, pt[1] + buffer)
229 def from_param(inp: Any) -> 'Bbox':
230 """ Return a Bbox from an input parameter. The box may be
231 given as a Bbox, a string or a list or strings or integer.
232 Raises a UsageError if the format is incorrect.
234 if isinstance(inp, Bbox):
238 if isinstance(inp, str):
240 elif isinstance(inp, abc.Sequence):
244 raise UsageError('Bounding box parameter needs 4 coordinates.')
246 x1, y1, x2, y2 = filter(math.isfinite, map(float, seq))
247 except ValueError as exc:
248 raise UsageError('Bounding box parameter needs to be numbers.') from exc
250 x1 = min(180, max(-180, x1))
251 x2 = min(180, max(-180, x2))
252 y1 = min(90, max(-90, y1))
253 y2 = min(90, max(-90, y2))
255 if x1 == x2 or y1 == y2:
256 raise UsageError('Bounding box with invalid parameters.')
258 return Bbox(min(x1, x2), min(y1, y2), max(x1, x2), max(y1, y2))
261 class GeometryFormat(enum.Flag):
262 """ Geometry output formats supported by Nominatim.
265 GEOJSON = enum.auto()
271 class DataLayer(enum.Flag):
272 """ Layer types that can be selected for reverse and forward search.
275 ADDRESS = enum.auto()
276 RAILWAY = enum.auto()
277 MANMADE = enum.auto()
278 NATURAL = enum.auto()
281 def format_country(cc: Any) -> List[str]:
282 """ Extract a list of country codes from the input which may be either
283 a string or list of strings. Filters out all values that are not
287 if isinstance(cc, str):
288 clist = cc.split(',')
289 elif isinstance(cc, abc.Sequence):
292 raise UsageError("Parameter 'country' needs to be a comma-separated list "
293 "or a Python list of strings.")
295 return [cc.lower() for cc in clist if isinstance(cc, str) and len(cc) == 2]
298 def format_excluded(ids: Any) -> List[int]:
299 """ Extract a list of place ids from the input which may be either
300 a string or a list of strings or ints. Ignores empty value but
301 throws a UserError on anything that cannot be converted to int.
304 if isinstance(ids, str):
305 plist = [s.strip() for s in ids.split(',')]
306 elif isinstance(ids, abc.Sequence):
309 raise UsageError("Parameter 'excluded' needs to be a comma-separated list "
310 "or a Python list of numbers.")
311 if not all(isinstance(i, int) or
312 (isinstance(i, str) and (not i or i.isdigit())) for i in plist):
313 raise UsageError("Parameter 'excluded' only takes place IDs.")
315 return [int(id) for id in plist if id] or [0]
318 def format_categories(categories: List[Tuple[str, str]]) -> List[Tuple[str, str]]:
319 """ Extract a list of categories. Currently a noop.
323 TParam = TypeVar('TParam', bound='LookupDetails') # pylint: disable=invalid-name
325 @dataclasses.dataclass
327 """ Collection of parameters that define the amount of details
328 returned with a lookup or details result.
330 geometry_output: GeometryFormat = GeometryFormat.NONE
331 """ Add the full geometry of the place to the result. Multiple
332 formats may be selected. Note that geometries can become quite large.
334 address_details: bool = False
335 """ Get detailed information on the places that make up the address
338 linked_places: bool = False
339 """ Get detailed information on the places that link to the result.
341 parented_places: bool = False
342 """ Get detailed information on all places that this place is a parent
343 for, i.e. all places for which it provides the address details.
344 Only POI places can have parents.
346 keywords: bool = False
347 """ Add information about the search terms used for this place.
349 geometry_simplification: float = 0.0
350 """ Simplification factor for a geometry in degrees WGS. A factor of
351 0.0 means the original geometry is kept. The higher the value, the
352 more the geometry gets simplified.
356 def from_kwargs(cls: Type[TParam], kwargs: Dict[str, Any]) -> TParam:
357 """ Load the data fields of the class from a dictionary.
358 Unknown entries in the dictionary are ignored, missing ones
359 get the default setting.
361 The function supports type checking and throws a UsageError
362 when the value does not fit.
364 def _check_field(v: Any, field: 'dataclasses.Field[Any]') -> Any:
366 return field.default_factory() \
367 if field.default_factory != dataclasses.MISSING \
369 if field.metadata and 'transform' in field.metadata:
370 return field.metadata['transform'](v)
371 if not isinstance(v, field.type):
372 raise UsageError(f"Parameter '{field.name}' needs to be of {field.type!s}.")
375 return cls(**{f.name: _check_field(kwargs[f.name], f)
376 for f in dataclasses.fields(cls) if f.name in kwargs})
379 @dataclasses.dataclass
380 class ReverseDetails(LookupDetails):
381 """ Collection of parameters for the reverse call.
383 max_rank: int = dataclasses.field(default=30,
384 metadata={'transform': lambda v: max(0, min(v, 30))}
386 """ Highest address rank to return.
388 layers: DataLayer = DataLayer.ADDRESS | DataLayer.POI
389 """ Filter which kind of data to include.
392 @dataclasses.dataclass
393 class SearchDetails(LookupDetails):
394 """ Collection of parameters for the search call.
396 max_results: int = 10
397 """ Maximum number of results to be returned. The actual number of results
400 min_rank: int = dataclasses.field(default=0,
401 metadata={'transform': lambda v: max(0, min(v, 30))}
403 """ Lowest address rank to return.
405 max_rank: int = dataclasses.field(default=30,
406 metadata={'transform': lambda v: max(0, min(v, 30))}
408 """ Highest address rank to return.
410 layers: Optional[DataLayer] = dataclasses.field(default=None,
411 metadata={'transform': lambda r : r})
412 """ Filter which kind of data to include. When 'None' (the default) then
413 filtering by layers is disabled.
415 countries: List[str] = dataclasses.field(default_factory=list,
416 metadata={'transform': format_country})
417 """ Restrict search results to the given countries. An empty list (the
418 default) will disable this filter.
420 excluded: List[int] = dataclasses.field(default_factory=list,
421 metadata={'transform': format_excluded})
422 """ List of OSM objects to exclude from the results. Currenlty only
423 works when the internal place ID is given.
424 An empty list (the default) will disable this filter.
426 viewbox: Optional[Bbox] = dataclasses.field(default=None,
427 metadata={'transform': Bbox.from_param})
428 """ Focus the search on a given map area.
430 bounded_viewbox: bool = False
431 """ Use 'viewbox' as a filter and restrict results to places within the
434 near: Optional[Point] = dataclasses.field(default=None,
435 metadata={'transform': Point.from_param})
436 """ Order results by distance to the given point.
438 near_radius: Optional[float] = dataclasses.field(default=None,
439 metadata={'transform': lambda r : r})
440 """ Use near point as a filter and drop results outside the given
441 radius. Radius is given in degrees WSG84.
443 categories: List[Tuple[str, str]] = dataclasses.field(default_factory=list,
444 metadata={'transform': format_categories})
445 """ Restrict search to places with one of the given class/type categories.
446 An empty list (the default) will disable this filter.
448 viewbox_x2: Optional[Bbox] = None
450 def __post_init__(self) -> None:
451 if self.viewbox is not None:
452 xext = (self.viewbox.maxlon - self.viewbox.minlon)/2
453 yext = (self.viewbox.maxlat - self.viewbox.minlat)/2
454 self.viewbox_x2 = Bbox(self.viewbox.minlon - xext, self.viewbox.minlat - yext,
455 self.viewbox.maxlon + xext, self.viewbox.maxlat + yext)
458 def restrict_min_max_rank(self, new_min: int, new_max: int) -> None:
459 """ Change the min_rank and max_rank fields to respect the
462 assert new_min <= new_max
463 self.min_rank = max(self.min_rank, new_min)
464 self.max_rank = min(self.max_rank, new_max)
467 def is_impossible(self) -> bool:
468 """ Check if the parameter configuration is contradictionary and
469 cannot yield any results.
471 return (self.min_rank > self.max_rank
472 or (self.bounded_viewbox
473 and self.viewbox is not None and self.near is not None
474 and self.viewbox.contains(self.near))
475 or self.layers is not None and not self.layers)
478 def layer_enabled(self, layer: DataLayer) -> bool:
479 """ Check if the given layer has been choosen. Also returns
480 true when layer restriction has been disabled completely.
482 return self.layers is None or bool(self.layers & layer)