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| -rw-r--r-- | COPYING.AGPL | 661 | ||||
| -rw-r--r-- | common.py | 83 | ||||
| -rwxr-xr-x | webmap-cgi | 177 |
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diff --git a/COPYING.AGPL b/COPYING.AGPL new file mode 100644 index 0000000..be3f7b2 --- /dev/null +++ b/COPYING.AGPL @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/> + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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Remote Network Interaction; Use with the GNU General Public License. + + Notwithstanding any other provision of this License, if you modify the +Program, your modified version must prominently offer all users +interacting with it remotely through a computer network (if your version +supports such interaction) an opportunity to receive the Corresponding +Source of your version by providing access to the Corresponding Source +from a network server at no charge, through some standard or customary +means of facilitating copying of software. This Corresponding Source +shall include the Corresponding Source for any work covered by version 3 +of the GNU General Public License that is incorporated pursuant to the +following paragraph. + + Notwithstanding any other provision of this License, you have +permission to link or combine any covered work with a work licensed +under version 3 of the GNU General Public License into a single +combined work, and to convey the resulting work. 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EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT +HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY +OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, +THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM +IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF +ALL NECESSARY SERVICING, REPAIR OR CORRECTION. + + 16. Limitation of Liability. + + IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS +THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY +GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE +USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF +DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD +PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), +EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF +SUCH DAMAGES. + + 17. Interpretation of Sections 15 and 16. + + If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +an absolute waiver of all civil liability in connection with the +Program, unless a warranty or assumption of liability accompanies a +copy of the Program in return for a fee. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + <one line to give the program's name and a brief idea of what it does.> + Copyright (C) <year> <name of author> + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU Affero General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. + +Also add information on how to contact you by electronic and paper mail. + + If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +<https://www.gnu.org/licenses/>. @@ -26,7 +26,7 @@ from pathlib import Path, PosixPath from stat import S_ISDIR import math import logging -from typing import Any, Optional, Never +from typing import Any, Iterator, Optional, Never from hashlib import sha256 from xdg.BaseDirectory import xdg_config_home @@ -39,8 +39,8 @@ def init_logger(app : str =__file__, level : int = logging.WARNING) -> logging.L log = logging.getLogger() log.setLevel(level) - pid = os.getenv('SYSTEMD_EXEC_PID', None) - if (pid is None or int(pid) != os.getpid() + if (os.getenv('SYSTEMD_EXEC_PID', None) is None + or os.getenv('INVOCATION_ID', None) is None or os.getenv('JOURNAL_STREAM', None) is None): ch = logging.StreamHandler() else: @@ -77,13 +77,35 @@ def find_config(filename : str = 'config.yml', appname : str = 'webmap') -> Path return p raise MissingConfiguration(filename) +def load_config(path : Optional[Path] = None) -> dict[str, Any]: + """Load configuration file""" + config_path = find_config() if path is None else path + with config_path.open(mode='r', encoding='utf-8') as fp: + return yaml.safe_load(fp) + +def layers_in_group(groupname : str, patterns : str|list[str], + layernames : set[str]) -> Iterator[str]: + """Get layer names matching the given patterns""" + if isinstance(patterns, str): + patterns = [patterns] + for pat in patterns: + has_match = False + for layername in layernames: + if fnmatchcase(layername, pat): + yield layername + has_match = True + if has_match: + continue + if pat in layernames: + # fallback to exact match + yield pat + else: + logging.warning('Pattern "%s" in group "%s" does not match anything', pat, groupname) + def parse_config(path : Optional[Path] = None, groupnames : Optional[list[str]] = None) -> dict[str, Any]: """Parse configuration file""" - - config_path = find_config() if path is None else path - with config_path.open(mode='r', encoding='utf-8') as fp: - config = yaml.safe_load(fp) + config = load_config(path) layers = config.get('layers', {}) for name, layerdefs in layers.items(): @@ -96,39 +118,25 @@ def parse_config(path : Optional[Path] = None, # filter layers that are not of interest if groupnames is not None: - layernames = [] + layernames = set() + layernames_all = set(layers.keys()) layer_groups = config.get('layer-groups', {}) for groupname in groupnames: - if groupname not in layer_groups: - if groupname in layers: - # fallback to layer names - layernames.append(groupname) + if groupname in layer_groups: + for name in layers_in_group(groupname, layer_groups[groupname], layernames_all): + if name in layernames: + logging.debug('Layer "%s" was already added, skipping', name) + else: + layernames.add(name) + elif groupname in layers: + # fallback to layer names + if groupname in layernames: + logging.debug('Layer "%s" was already added, skipping', groupname) else: - logging.error('Unknown group/layer name "%s"', groupname) - sys.exit(1) + layernames.add(groupname) else: - patterns = layer_groups[groupname] - if isinstance(patterns, str): - patterns = [patterns] - for pat in patterns: - has_match = False - for layername in layers: - if fnmatchcase(layername, pat): - if layername in layernames: - logging.debug('Layer "%s" was already added, skipping', layername) - else: - layernames.append(layername) - has_match = True - if has_match: - pass - elif pat in layers: - # fallback to exact match - if pat in layernames: - logging.debug('Layer "%s" was already added, skipping', pat) - else: - layernames.append(pat) - else: - logging.warning('Group name "%s" does not match anything', groupname) + logging.error('Unknown group/layer name "%s"', groupname) + sys.exit(1) layers = { name: layers[name] for name in layernames } @@ -139,8 +147,7 @@ def parse_config(path : Optional[Path] = None, if isinstance(extent, list): config['extent'] = tuple(extent) if config.get('SRS', None) is None: - raise BadConfiguration('Configured extent without SRS', - config_path=config_path) + raise BadConfiguration('Configured extent without SRS') return config diff --git a/webmap-cgi b/webmap-cgi new file mode 100755 index 0000000..616b2fd --- /dev/null +++ b/webmap-cgi @@ -0,0 +1,177 @@ +#!/usr/bin/python3 + +#---------------------------------------------------------------------- +# Webmap CGI (Common Gateway Interface) for the Klimatanalys Norr project +# Copyright © 2025 Guilhem Moulin <info@guilhem.se> +# +# This program is free software: you can redistribute it and/or modify it +# under the terms of the GNU Affero General Public License as published by +# the Free Software Foundation, either version 3 of the License, or (at +# your option) any later version. +# +# This program is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero +# General Public License for more details. +# +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see <https://www.gnu.org/licenses/>. +#---------------------------------------------------------------------- + +# pylint: disable=invalid-name, missing-module-docstring, fixme +# pylint: enable=invalid-name + +import sys +from os import path as os_path +from json import load as json_load, JSONDecodeError +import logging +from typing import Final, Iterator +import atexit + +from psycopg import connect, Cursor # pylint: disable=import-error + +import common + +def get_table_map() -> dict[tuple[str, str], str]: + """Get mapping of pairs (MVT group name, layername) to table name.""" + ret = {} + config = common.load_config() + layer_groups = config.get('layer-groups', {}) + layers = config.get('layers', {}) + layernames = set(layers.keys()) + for groupname, patterns in layer_groups.items(): + for layername in common.layers_in_group(groupname, patterns, layernames): + exportdef = layers[layername].get('publish', None) + if exportdef is None: + continue + if isinstance(exportdef, str): + exportdef = [ exportdef ] + for layername_mvt in exportdef: + k = (groupname, layername_mvt) + if k in ret: + raise RuntimeError(f'Duplicate key {k}') + ret[k] = layername + return ret + +SCHEMA_NAME : Final[str] = 'postgis' +def get_query(layername : str) -> bytes: + """Get GeoJSON-producing query for the given layer.""" + # TODO don't hardcode geometry column name + # TODO[trixie]id_column => 'ogc_fid' (but don't hardcode either) + query = 'SELECT convert_to(ST_AsGeoJSON(m.*,' + query += 'geom_column=>\'wkb_geometry\',' + query += 'pretty_bool=>\'f\'),' + query += '\'UTF8\') AS "GeoJSON" ' + query += 'FROM (' + query += 'SELECT l.* ' + query += 'FROM ' + common.escape_identifier(SCHEMA_NAME) + query += '.' + common.escape_identifier(layername) + ' l ' + query += 'WHERE l.ogc_fid = %s' + query += ') m' + return query.encode('utf-8') + + +STATUS_OK : Final[str] = '200 OK' +STATUS_BAD_REQUEST : Final[str] = '400 Bad Request' +STATUS_NOT_ALLOWED : Final[str] = '405 Method Not Allowed' +STATUS_INTERNAL_SERVER_ERROR : Final[str] = '500 Internal Server Error' + +EMPTY_RESPONSE_HEADERS : Final[list[tuple[str,str]]] = [ + ('Content-Type', 'text/plain'), + ('Content-Length', '0'), +] +CONTENT_TYPE_JSON : Final[tuple[str,str]] = ('Content-Type', 'application/json; charset=UTF-8') + +MAX_FEATURE_COUNT : Final[int] = 500 +def application(env, start_response) -> Iterator[bytes]: + """Main application.""" + if env['REQUEST_METHOD'].upper() != 'POST': + logging.error('Invalid request method %s', env['REQUEST_METHOD']) + start_response(STATUS_NOT_ALLOWED, EMPTY_RESPONSE_HEADERS) + return + + content_type = env.get('CONTENT_TYPE', '').lower() + if content_type != 'application/json' and not content_type.startswith('application/json;'): + logging.error('Invalid Content-Type: %s', content_type) + start_response(STATUS_BAD_REQUEST, EMPTY_RESPONSE_HEADERS) + return + + first = True + try: + body = json_load(env['wsgi.input']) + if not isinstance(body, dict): + raise ValueError + + start_response(STATUS_OK, [CONTENT_TYPE_JSON]) + # pylint: disable-next=no-member + with PG_CONN.cursor(binary=True, scrollable=False, withhold=False) as cur: + if not isinstance(body, dict): + raise ValueError + mvt = body.get('mvt', None) + layername = body.get('layer', None) + if not isinstance(mvt, str) or not isinstance(layername, str): + raise ValueError + query = QUERY_MAP[TABLE_MAP[(mvt, layername)]] + fid = body.get('fid', None) + if not isinstance(fid, int): + raise ValueError + cur.execute(query, params=(fid,)) + resp = cur.fetchone() + if resp is not None: + yield resp[0] + + except (JSONDecodeError, LookupError, UnicodeDecodeError, ValueError) as exc: + logging.exception('Invalid request body') + # start_response(,,sys.exc_info()) should work here, but doesn't + # because of https://github.com/unbit/uwsgi/issues/2278 + if first: + start_response(STATUS_BAD_REQUEST, EMPTY_RESPONSE_HEADERS) + else: + # headers already sent, can't do better; the client will get a 200 status + # code, but fail to parse the payload as JSON anyway + exc_info = sys.exc_info() + raise exc_info[1].with_traceback(exc_info[2]) from exc + except Exception as exc: # pylint: disable=broad-exception-caught + logging.exception('Internal Server Error') + if first: + start_response(STATUS_INTERNAL_SERVER_ERROR, EMPTY_RESPONSE_HEADERS) + else: + exc_info = sys.exc_info() + raise exc_info[1].with_traceback(exc_info[2]) from exc + +# We could use a psycopg_pool.ConnectionPool() but that would be +# overkill since we only have 2 workers and no threads. So each worker +# simply opens a (single) connection to PostgreSQL at launch time. +# Use autocommit to avoid starting a transaction, cf. +# https://www.psycopg.org/psycopg3/docs/basic/transactions.html#autocommit-transactions +PG_CONN = connect('postgresql://webmap_guest@/webmap', + autocommit=True, + prepare_threshold=0, + # TODO[trixie] use cursor_factory=RawCursor + # https://www.psycopg.org/psycopg3/docs/advanced/cursors.html#cursor-types + cursor_factory=Cursor) + +@atexit.register +def handler(): + """Gracefully close the connection before terminating the worker""" + # avoid "AttributeError: 'NoneType' object has no attribute 'connection_summary'" + # when destructing the object + # TODO[trixie] reevaluate, possibly related to https://github.com/psycopg/psycopg/issues/591 + PG_CONN.close() # pylint: disable=no-member + +common.init_logger(app=os_path.basename(__file__), level=logging.INFO) +TABLE_MAP : Final[dict[tuple[str, str], str]] = get_table_map() +QUERY_MAP : Final[dict[str,bytes]] = { lyr:get_query(lyr) for lyr in set(TABLE_MAP.values()) } + +PG_CONN.execute( # pylint: disable=no-member + 'SET search_path TO ' + common.escape_identifier(SCHEMA_NAME) + ',public', + prepare=False) +PG_CONN.execute( # pylint: disable=no-member + 'SET statement_timeout TO 15000', # 15s + prepare=False) + +del sys.modules['common'] +del common +del get_query +del get_table_map +del os_path |