forked from georchestra/sdi-consistence-check
-
Notifications
You must be signed in to change notification settings - Fork 0
/
owscheck.py
197 lines (172 loc) · 7.62 KB
/
owscheck.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
import logging
import os
import xml.etree.ElementTree as ET
from urllib.parse import urlparse
import requests
from owslib.wfs import WebFeatureService
from owslib.wms import WebMapService
from owslib.util import ServiceException
from credentials import Credentials
from geometadata import GeoMetadata
from inconsistency import *
class OwsServer:
"""
Class which manages the consumption of OWS servers (WMS,WFS).
"""
def __init__(self, gsurl, wms = True, creds = Credentials(), timeout=30):
"""
constructor.
:param gsurl (string): url to the OWS service endpoint, no query_string parameters are needed,
:param wms (boolean): true if the service is a WMS one, false for WFS.
:param creds (Credentials): an optional Credentials provider
"""
u = urlparse(gsurl)
(username, password) = creds.get(u.hostname)
if wms:
self._ows = WebMapService(gsurl, username=username,
password=password, version="1.3.0",
timeout=timeout)
else:
self._ows = WebFeatureService(gsurl, username=username,
password=password, version="1.1.0",
timeout=timeout)
self._populateLayers()
def _populateLayers(self):
"""
populates the layersByWorkspace property, by consuming the GetCapabilities response.
"""
self.layersByWorkspace = {}
for content in self._ows.contents:
# if the workspace is not guessable from the layer name,
# skip it.
try:
(workspace, layer) = content.split(":", maxsplit=1)
try:
self.layersByWorkspace[workspace].append(layer)
except KeyError:
self.layersByWorkspace[workspace] = [layer]
except ValueError:
try:
self.layersByWorkspace[None].append(content)
except KeyError:
self.layersByWorkspace[None] = [content]
pass
def getMetadatas(self, layerName):
"""
Given a layer name, returns the associated metadatas.
:param layerName (string): the layer name
:return: a set of tuples containing metadata URLs and format.
"""
l = self._ows[layerName]
return set([(i['format'], i['url']) for i in l.metadataUrls])
def getLayer(self, name):
try:
return self._ows[name]
# Not found ? try without workspace
except KeyError:
if ":" in name:
(_, layername) = name.split(":")
return self._ows[layername]
class CachedOwsServices:
def __init__(self, credentials = Credentials(), disable_ssl=False, timeout=30):
self._servers = { "wms" : {} , "wfs" : {} }
self._credentials = credentials
self._disable_ssl = disable_ssl
self._timeout = timeout
def checkWfsLayer(self, url, name):
self._checkLayer(url, name, is_wms=False)
def checkWmsLayer(self, url, name):
self._checkLayer(url, name, is_wms=True)
def _check_legit_getcapabilities_url(self, url, name, is_wms):
auth = None
if self._credentials is not None:
(username, password) = self._credentials.getFromUrl(url)
if username is not None and password is not None:
auth = (username,password)
resp = requests.get(url, auth=auth, verify=not self._disable_ssl,
timeout=self._timeout)
str_url = resp.text
first_tag = ET.fromstring(str_url).tag.lower()
if (first_tag.endswith("wms_capabilities" if is_wms else "wfs_capabilities")):
pass
else:
raise GnToGsInvalidCapabilitiesUrl(layer_name=name, layer_url=url, is_wms=is_wms)
def _checkLayer(self, url, name, is_wms):
servers_cache = self._servers["wms" if is_wms else "wfs"]
if url not in servers_cache.keys():
self._check_legit_getcapabilities_url(url, name, is_wms)
try:
servers_cache[url] = OwsServer(url, is_wms, creds=self._credentials)
except BaseException as ex:
raise GnToGsOtherError(layer_name=name,
layer_url=url,
exc=ex)
try:
servers_cache[url].getLayer(name)
except KeyError as ex:
raise GnToGsLayerNotFoundInconsistency(layer_name=name, layer_url=url, msg="Layer not found on GS")
class OwsChecker:
"""
Class which actually checks a OWS server.
"""
logger = logging.getLogger("owschecker")
def __init__(self, serviceUrl, wms=True, creds=Credentials(), checkLayers = False, timeout=30):
self._inconsistencies = []
self._layer_names = []
self.wms = wms
try:
self._service = OwsServer(serviceUrl, wms, creds, timeout=timeout)
except BaseException as e:
raise UnparseableGetCapabilitiesInconsistency(serviceUrl, str(e))
layer_idx = 0
for workspace, layers in self._service.layersByWorkspace.items():
for layer in layers:
if workspace is not None:
fqLayerName = "%s:%s" % (workspace, layer)
else:
fqLayerName = layer
self._layer_names.append(fqLayerName)
if checkLayers:
# depending on OWS type, we'll have to check a different URL
# either a GetMap or a GetFeature
l = self._service.getLayer(fqLayerName)
if self._service._ows.identification.type == "WMS":
try:
a = self._service._ows.getmap(layers=[fqLayerName], \
srs='EPSG:4326', \
format='image/png', \
size=(10,10), \
bbox=l.boundingBoxWGS84)
except ServiceException as e:
e.layer_name = fqLayerName
e.layer_index = layer_idx
self._inconsistencies.append(e)
else:
try:
a = self._service._ows.getfeature(typename=fqLayerName, \
srsname=l.crsOptions[0], \
bbox=l.boundingBoxWGS84, \
maxfeatures=1)
except ServiceException as e:
e.layer_name = fqLayerName
e.layer_index = layer_idx
self._inconsistencies.append(e)
mdUrls = self._service.getMetadatas(fqLayerName)
if len(mdUrls) == 0:
self._inconsistencies.append(GsMetadataMissingInconsistency(fqLayerName, layer_idx))
layer_idx += 1
continue
for (mdFormat, mdUrl) in mdUrls:
try:
GeoMetadata(mdUrl, mdFormat, creds=creds)
except GsToGnMetadataInvalidInconsistency as e:
e.layer_name = fqLayerName
e.layer_index = layer_idx
self._inconsistencies.append(e)
layer_idx += 1
def get_inconsistencies(self):
return self._inconsistencies
def get_service(self):
return self._service
def get_layer_names(self):
return self._layer_names