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wfsclientdialog.py
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wfsclientdialog.py
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"""
/***************************************************************************
WfsClientDialog
A QGIS plugin
WFS 2.0 Client
-------------------
begin : 2012-05-17
copyright : (C) 2012 by Juergen Weichand
email : [email protected]
website : http://www.weichand.de
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
"""
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtNetwork import *
from PyQt5 import QtXml, QtXmlPatterns
from qgis.core import *
from xml.etree import ElementTree
from osgeo import gdal
from osgeo import ogr
import urllib.request as urllib2
import string
import random
import tempfile
import os
import os.path
import re
import logging
from .epsglib import *
from .wfs20lib import *
from .ui_wfsclient import Ui_WfsClient
from .metadataclientdialog import MetadataClientDialog
plugin_path = os.path.abspath(os.path.dirname(__file__))
class WfsClientDialog(QtWidgets.QDialog):
def __init__(self, parent, url):
QtWidgets.QDialog.__init__(self)
# Set up the user interface from Designer.
self.parent = parent
self.ui = Ui_WfsClient()
self.ui.setupUi(self)
self.settings = QgsSettings()
self.qnam = QNetworkAccessManager()
self.qnam.authenticationRequired.connect(self.authenticationRequired)
self.qnam.sslErrors.connect(self.sslErrors)
logformat = '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
logfile = self.get_temppath("wfs20client.log")
logging.basicConfig(filename=logfile, level=logging.DEBUG, format=logformat)
self.logger = logging.getLogger('WFS 2.0 Client')
self.ui.frmExtent.show()
self.ui.frmParameter.hide()
self.ui.progressBar.setVisible(False)
self.ui.cmdListStoredQueries.setVisible(False)
# Load default onlineresource
if url:
self.ui.txtUrl.setText(url)
else:
self.ui.txtUrl.setText(self.get_url())
self.ui.txtCount.setText(self.get_featurelimit())
self.ui.txtUsername.setVisible(False)
self.ui.txtPassword.setVisible(False)
self.ui.lblUsername.setVisible(False)
self.ui.lblPassword.setVisible(False)
self.parameter_lineedits = []
self.parameter_labels = []
self.init_variables()
self.onlineresource = ""
self.vendorparameters = ""
self.ui.lblMessage.setText("SRS is set to EPSG: {0}".format(str(self.parent.iface.mapCanvas().mapSettings().destinationCrs().postgisSrid())))
self.ui.txtSrs.setText("urn:ogc:def:crs:EPSG::{0}".format(str(self.parent.iface.mapCanvas().mapSettings().destinationCrs().postgisSrid())))
self.ui.cmdGetCapabilities.clicked.connect(self.getCapabilities)
self.ui.cmdListStoredQueries.clicked.connect(self.listStoredQueries)
self.ui.cmdGetFeature.clicked.connect(self.getFeature)
self.ui.cmdMetadata.clicked.connect(self.show_metadata)
self.ui.cmdExtent.clicked.connect(self.show_extent)
self.ui.chkExtent.clicked.connect(self.update_extent_frame)
self.ui.chkAuthentication.clicked.connect(self.update_authentication)
self.ui.cmbFeatureType.currentIndexChanged.connect(self.update_ui)
self.httpRequestAborted = False
self.reply = None
if url:
self.getCapabilities()
def init_variables(self):
self.columnid = 0
self.bbox = ""
self.querytype = ""
self.featuretypes = {}
self.storedqueries = {}
# Process GetCapabilities-Request
def getCapabilities(self):
self.init_variables()
self.ui.cmdGetFeature.setEnabled(False)
self.ui.cmbFeatureType.clear()
self.ui.frmExtent.show()
self.ui.frmParameter.hide()
self.ui.chkExtent.setChecked(False)
self.ui.txtExtentWest.setText("")
self.ui.txtExtentEast.setText("")
self.ui.txtExtentNorth.setText("")
self.ui.txtExtentSouth.setText("")
self.ui.cmdMetadata.setVisible(True)
self.ui.cmdExtent.setVisible(True)
self.ui.lblCount.setVisible(True)
self.ui.txtCount.setText(self.get_featurelimit())
self.ui.txtCount.setVisible(True)
self.ui.lblSrs.setVisible(True)
self.ui.txtSrs.setText("urn:ogc:def:crs:EPSG::{0}".format(str(self.parent.iface.mapCanvas().mapSettings().destinationCrs().postgisSrid())))
self.ui.txtSrs.setVisible(True)
self.ui.txtFeatureTypeTitle.setVisible(False)
self.ui.txtFeatureTypeDescription.setVisible(False)
self.ui.lblInfo.setText("FeatureTypes")
self.ui.lblMessage.setText("")
self.onlineresource = self.ui.txtUrl.text().strip()
if len(self.onlineresource) == 0:
QtWidgets.QMessageBox.critical(self, "OnlineResource Error", "Not a valid OnlineResource!")
return
if "?" in self.onlineresource:
request = "{0}{1}".format(self.onlineresource, self.fix_acceptversions(self.onlineresource, "&"))
else:
request = "{0}{1}".format(self.onlineresource, self.fix_acceptversions(self.onlineresource, "?"))
self.reply = None
self.httpGetId = 0
self.url = QtCore.QUrl(request)
self.startCapabilitiesRequest(self.url)
#Process ListStoredQueries-Request
def listStoredQueries(self):
self.init_variables()
self.ui.cmdGetFeature.setEnabled(False)
self.ui.cmbFeatureType.clear()
self.ui.frmExtent.hide()
self.ui.frmParameter.show()
self.layout_reset()
self.ui.cmdMetadata.setVisible(False)
self.ui.cmdExtent.setVisible(False)
self.ui.lblCount.setVisible(False)
self.ui.txtCount.setText("")
self.ui.txtCount.setVisible(False)
self.ui.lblSrs.setVisible(False)
self.ui.txtSrs.setVisible(False)
self.ui.txtFeatureTypeTitle.setVisible(False)
self.ui.txtFeatureTypeDescription.setVisible(False)
self.ui.lblInfo.setText("StoredQueries")
self.ui.lblMessage.setText("")
# self.onlineresource = self.ui.txtUrl.text().trimmed()
if not self.onlineresource:
QtWidgets.QMessageBox.critical(self, "OnlineResource Error", "Not a valid OnlineResource!")
return
if "?" in self.onlineresource:
request = "{0}&service=WFS&version=2.0.0&request=DescribeStoredQueries".format(self.onlineresource)
else:
request = "{0}?service=WFS&version=2.0.0&request=DescribeStoredQueries".format(self.onlineresource)
request += self.vendorparameters
self.reply = None
self.httpGetId = 0
self.url = QtCore.QUrl(request)
self.startListStoredQueriesRequest(self.url)
def startMetadataRequest(self, url):
self.logMessage('Requesting metadata from {0}'.format(url.url()))
self.reply = self.qnam.get(QNetworkRequest(url))
self.reply.error.connect(self.errorOcurred)
self.reply.finished.connect(self.MetadataRequestFinished)
def startCapabilitiesRequest(self, url):
self.logMessage('Requesting capabilities from {0}'.format(url.url()))
self.reply = self.qnam.get(QNetworkRequest(url))
self.reply.error.connect(self.errorOcurred)
self.reply.finished.connect(self.capabilitiesRequestFinished)
def startListStoredQueriesRequest(self, url):
self.logMessage('Requesting list of stored queries from {0}'.format(url.url()))
self.reply = self.qnam.get(QNetworkRequest(url))
self.reply.error.connect(self.errorOcurred)
self.reply.finished.connect(self.storedQueriesRequestFinished)
def MetadataRequestFinished(self):
if self.checkForHTTPErrors():
return
response = self.reply
xslfilename = os.path.join(plugin_path, "iso19139jw.xsl")
response_content = response.readAll()
encoding = 'utf_8'
length = len(response_content)
for header in response.rawHeaderPairs():
if header[0].toLower() == 'content-type':
self.logMessage('Found Content-Type header: {0}'.format(header[1]))
charset_index = header[1].indexOf('charset=')
if charset_index > -1:
encoding = str(header[1][charset_index + 8:], 'ascii')
self.logMessage('Got encoding from header: {0}'.format(encoding))
if header[0].toLower() == 'content-length':
self.logMessage('Found Content-Length header: {0}'.format(header[1]))
length = int(header[1])
encoding = encoding.lower().translate(encoding.maketrans('-', '_'))
self.logMessage('Using encoding {0} for metadata'.format(encoding))
self.logMessage('Using content-length {0} for metadata'.format(length))
try:
xml_source = str(response_content, encoding)
except LookupError:
self.logMessage('Could not use encoding {0}, trying again with utf_8'.format(encoding), Qgis.Warning)
xml_source = str(response_content, 'utf_8')
# xslt
qry = QtXmlPatterns.QXmlQuery(QtXmlPatterns.QXmlQuery.XSLT20)
qry.setMessageHandler(MessageHandler())
qry.setFocus(xml_source)
qry.setQuery(QtCore.QUrl('file:///' + xslfilename))
html = qry.evaluateToString()
if html:
# create and show the dialog
dlg = MetadataClientDialog()
dlg.ui.wvMetadata.setHtml(html)
# show the dialog
dlg.show()
result = dlg.exec_()
# See if OK was pressed
if result == 1:
# do something useful (delete the line containing pass and
# substitute with your code
pass
else:
QtWidgets.QMessageBox.critical(self, "Metadata Error", "Unable to read the Metadata")
def capabilitiesRequestFinished(self):
if self.reply is None:
# already aborted
return
redirectionTarget = self.reply.attribute(QNetworkRequest.RedirectionTargetAttribute)
if redirectionTarget is not None:
newUrl = self.url.resolved(redirectionTarget)
self.abort_request()
ret = QtWidgets.QMessageBox.question(
self,
"HTTP Location redirect",
"The server wants to redirect your request to\n%s\n\nDo you wish to follow this redirect?\n\n" \
"Any authentication details will also be forwarded!" % newUrl.toString(),
QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No
)
if ret == QtWidgets.QMessageBox.Yes:
self.url = newUrl
self.startCapabilitiesRequest(self.url)
return
self.update_ui()
return
if self.checkForHTTPErrors():
self.abort_request()
self.update_ui()
return
#self.reply.
buf = self.reply.readAll().data()
try:
root = ElementTree.fromstring(buf)
except ElementTree.ParseError as err:
QtWidgets.QMessageBox.critical(
self,
"XML Parsing error",
"The capabilities document could not be read:\n{0}".format(err.msg)
)
return
if self.is_wfs20_capabilties(root):
# WFS 2.0 Namespace
nswfs = "{http://www.opengis.net/wfs/2.0}"
nsxlink = "{http://www.w3.org/1999/xlink}"
nsows = "{http://www.opengis.net/ows/1.1}"
# GetFeature OnlineResource
for target in root.findall("{0}OperationsMetadata/{0}Operation".format(nsows)):
if target.get("name") == "GetFeature":
for subtarget in target.findall("{0}DCP/{0}HTTP/{0}Get".format(nsows)):
getfeatureurl = subtarget.get("{0}href".format(nsxlink))
if not "?" in getfeatureurl:
self.onlineresource = getfeatureurl
else:
self.onlineresource = getfeatureurl[:getfeatureurl.find("?")]
self.vendorparameters = getfeatureurl[getfeatureurl.find("?"):].replace("?", "&")
for target in root.findall("{0}FeatureTypeList/{0}FeatureType".format(nswfs)):
for name in target.findall("{0}Name".format(nswfs)):
self.ui.cmbFeatureType.addItem(name.text, name.text)
featuretype = FeatureType(name.text)
if ":" in name.text:
nsmap = self.get_namespace_map(buf)
for prefix in nsmap:
if prefix == name.text[:name.text.find(":")]:
featuretype.setNamespace(nsmap[prefix])
featuretype.setNamespacePrefix(prefix)
break
for title in target.findall("{0}Title".format(nswfs)):
featuretype.setTitle(title.text)
for abstract in target.findall("{0}Abstract".format(nswfs)):
featuretype.setAbstract(abstract.text)
for metadata_url in target.findall("{0}MetadataURL".format(nswfs)):
featuretype.setMetadataUrl(metadata_url.get("{0}href".format(nsxlink)))
for bbox in target.findall("{0}WGS84BoundingBox".format(nsows)):
for lowercorner in bbox.findall("{0}LowerCorner".format(nsows)):
featuretype.setWgs84BoundingBoxEast(lowercorner.text.split(' ')[0])
featuretype.setWgs84BoundingBoxSouth(lowercorner.text.split(' ')[1])
for uppercorner in bbox.findall("{0}UpperCorner".format(nsows)):
featuretype.setWgs84BoundingBoxWest(uppercorner.text.split(' ')[0])
featuretype.setWgs84BoundingBoxNorth(uppercorner.text.split(' ')[1])
self.featuretypes[name.text] = featuretype
self.querytype = "adhocquery"
else:
self.ui.lblMessage.setText("")
self.update_ui()
# Lock
self.ui.cmdGetCapabilities.setText("List FeatureTypes")
self.ui.cmdListStoredQueries.setVisible(True)
self.ui.chkAuthentication.setEnabled(False)
self.ui.txtUrl.setEnabled(False)
self.ui.txtUsername.setEnabled(False)
self.ui.txtPassword.setEnabled(False)
def storedQueriesRequestFinished(self):
if self.reply is None:
# already aborted
return
if self.checkForHTTPErrors():
self.abort_request()
self.update_ui()
return
buf = self.reply.readAll().data()
try:
root = ElementTree.fromstring(buf)
except ElementTree.ParseError as err:
QtWidgets.QMessageBox.critical(
self,
"XML Parsing error",
"The stored queries list could not be read:\n{0}".format(err.msg)
)
self.update_ui()
return
# WFS 2.0 Namespace
namespace = "{http://www.opengis.net/wfs/2.0}"
# check correct Rootelement
if root.tag == "{0}DescribeStoredQueriesResponse".format(namespace):
for target in root.findall("{0}StoredQueryDescription".format(namespace)):
self.ui.cmbFeatureType.addItem(target.get("id"),target.get("id"))
lparameter = []
for parameter in target.findall("{0}Parameter".format(namespace)):
lparameter.append(StoredQueryParameter(parameter.get("name"), parameter.get("type")))
storedquery = StoredQuery(target.get("id"), lparameter)
for title in target.findall("{0}Title".format(namespace)):
storedquery.setTitle(title.text)
for abstract in target.findall("{0}Abstract".format(namespace)):
storedquery.setAbstract(abstract.text)
self.storedqueries[target.get("id")] = storedquery
self.querytype="storedquery" #R
else:
QtWidgets.QMessageBox.critical(self, "Error", "Not a valid DescribeStoredQueries-Response!")
self.update_ui()
def errorOcurred(self, error_code):
if self.reply is None:
self.logMessage('HTTP error occurred: {0}'.format(error_code), Qgis.Warning)
else:
self.logMessage('HTTP error occurred: {0}'.format(self.reply.errorString(), Qgis.Warning))
def checkForHTTPErrors(self):
http_code = self.reply.attribute(QNetworkRequest.HttpStatusCodeAttribute)
if http_code is not None:
self.logMessage('Request finished with HTTP code {0}'.format(http_code))
else:
self.logMessage('Request finished with no HTTP code (aborted?)')
if http_code == 401:
QtWidgets.QMessageBox.critical(
self,
"HTTP 401 Unauthorized",
"Authentication is required for this request"
)
return True
if http_code == 403:
QtWidgets.QMessageBox.critical(
self,
"HTTP 403 Forbidden",
"Your authentication is insufficient for this request"
)
return True
if http_code == 404:
QtWidgets.QMessageBox.critical(
self,
"HTTP 404 Not Found",
"The specified resource was not found - is the URL correct?"
)
return True
error = self.reply.error()
if error != QNetworkReply.NoError:
if not self.httpRequestAborted:
QtWidgets.QMessageBox.critical(self, "HTTP Error",
"Request failed: %s." % self.reply.errorString())
return True
# Process GetFeature-Request
def getFeature(self):
self.ui.lblMessage.setText("Please wait while downloading!")
if self.querytype == "storedquery":
query_string = "?service=WFS&request=GetFeature&version=2.0.0&STOREDQUERY_ID={0}".format(self.ui.cmbFeatureType.currentText())
storedquery = self.storedqueries[self.ui.cmbFeatureType.currentText()]
lparameter = storedquery.getStoredQueryParameterList()
for i in range(len(lparameter)):
if not lparameter[i].isValidValue(self.parameter_lineedits[i].text().strip()):
QtWidgets.QMessageBox.critical(self, "Validation Error", lparameter[i].getName() + ": Value validation failed!")
self.ui.lblMessage.setText("")
return
query_string+= "&{0}={1}".format(urllib2.quote(lparameter[i].getName()), urllib2.quote(self.parameter_lineedits[i].text().strip()))
else :
# FIX
featuretype = self.featuretypes[self.ui.cmbFeatureType.currentText()]
typeNames=urllib2.quote(self.ui.cmbFeatureType.currentText().encode('utf8'))
if len(self.bbox) < 1:
query_string = "?service=WFS&request=GetFeature&version=2.0.0&srsName={0}&typeNames={1}".format(self.ui.txtSrs.text().strip(), typeNames)
else:
query_string = "?service=WFS&request=GetFeature&version=2.0.0&srsName={0}&typeNames={1}&bbox={2}".format(self.ui.txtSrs.text().strip(), typeNames, self.bbox)
if len(featuretype.getNamespace()) > 0 and len(featuretype.getNamespacePrefix()) > 0:
#query_string += "&namespace=xmlns({0}={1})".format(featuretype.getNamespacePrefix(), urllib2.quote(featuretype.getNamespace(),""))
query_string += "&namespaces=xmlns({0},{1})".format(featuretype.getNamespacePrefix(), urllib2.quote(featuretype.getNamespace(),""))
if len(self.ui.txtCount.text().strip()) > 0:
query_string+= "&count={0}".format(self.ui.txtCount.text().strip())
# /FIX
query_string+=self.vendorparameters
resolvedepth = self.settings.value("/Wfs20Client/resolveDepth")
if resolvedepth:
query_string+="&resolve=local&resolvedepth={0}".format(resolvedepth)
self.logMessage(self.onlineresource + query_string)
self.httpGetId = 0
self.httpRequestAborted = False
layername="wfs{0}".format(''.join(random.choice(string.ascii_uppercase + string.digits) for x in range(6)))
self.downloadFile(self.onlineresource, query_string, self.get_temppath("{0}.gml".format(layername)))
"""
############################################################################################################################
# UI
############################################################################################################################
"""
# UI: Update Parameter-Frame
def update_ui(self):
if self.querytype == "adhocquery":
featuretype = self.featuretypes[self.ui.cmbFeatureType.currentText()]
if featuretype.getTitle():
if len(featuretype.getTitle()) > 0:
self.ui.txtFeatureTypeTitle.setVisible(True)
self.ui.txtFeatureTypeTitle.setPlainText(featuretype.getTitle())
else:
self.ui.txtFeatureTypeTitle.setVisible(False)
else:
self.ui.txtFeatureTypeTitle.setVisible(False)
if featuretype.getAbstract():
if len(featuretype.getAbstract()) > 0:
self.ui.txtFeatureTypeDescription.setVisible(True)
self.ui.txtFeatureTypeDescription.setPlainText(featuretype.getAbstract())
else:
self.ui.txtFeatureTypeDescription.setVisible(False)
else:
self.ui.txtFeatureTypeDescription.setVisible(False)
self.show_metadata_button(True)
self.show_extent_button(True)
self.ui.cmdGetFeature.setEnabled(True)
self.ui.lblMessage.setText("")
if self.querytype == "storedquery":
storedquery = self.storedqueries[self.ui.cmbFeatureType.currentText()]
if storedquery.getTitle():
if len(storedquery.getTitle()) > 0:
self.ui.txtFeatureTypeTitle.setVisible(True)
self.ui.txtFeatureTypeTitle.setPlainText(storedquery.getTitle())
else:
self.ui.txtFeatureTypeTitle.setVisible(False)
else:
self.ui.txtFeatureTypeTitle.setVisible(False)
if storedquery.getAbstract():
if len(storedquery.getAbstract()) > 0:
self.ui.txtFeatureTypeDescription.setVisible(True)
self.ui.txtFeatureTypeDescription.setPlainText(storedquery.getAbstract())
else:
self.ui.txtFeatureTypeDescription.setVisible(False)
else:
self.ui.txtFeatureTypeDescription.setVisible(False)
self.ui.cmdGetFeature.setEnabled(True)
self.ui.lblMessage.setText("")
self.layout_reset()
for parameter in storedquery.getStoredQueryParameterList():
self.layout_add_parameter(parameter)
# UI: Update Extent-Frame
def update_extent_frame(self):
if self.ui.chkExtent.isChecked():
canvas=self.parent.iface.mapCanvas()
ext=canvas.extent()
self.ui.txtExtentWest.setText('%s'%ext.xMinimum())
self.ui.txtExtentEast.setText('%s'%ext.xMaximum())
self.ui.txtExtentNorth.setText('%s'%ext.yMaximum())
self.ui.txtExtentSouth.setText('%s'%ext.yMinimum())
if (isAxisOrderLatLon(self.ui.txtSrs.text().strip())):
self.bbox='%s'%ext.yMinimum() + "," + '%s'%ext.xMinimum() + "," + '%s'%ext.yMaximum() + "," + '%s'%ext.xMaximum() + ",{0}".format(self.ui.txtSrs.text().strip())
else:
self.bbox='%s'%ext.xMinimum() + "," + '%s'%ext.yMinimum() + "," + '%s'%ext.xMaximum() + "," + '%s'%ext.yMaximum() + ",{0}".format(self.ui.txtSrs.text().strip())
else:
self.ui.txtExtentWest.setText("")
self.ui.txtExtentEast.setText("")
self.ui.txtExtentNorth.setText("")
self.ui.txtExtentSouth.setText("")
self.bbox=""
# UI: Update Main-Frame / Enable|Disable Authentication
def update_authentication(self):
if not self.ui.chkAuthentication.isChecked():
self.ui.frmMain.setGeometry(QtCore.QRect(10,90,501,551))
self.ui.txtUsername.setVisible(False)
self.ui.txtPassword.setVisible(False)
self.ui.lblUsername.setVisible(False)
self.ui.lblPassword.setVisible(False)
self.resize(516, 648)
else:
self.ui.frmMain.setGeometry(QtCore.QRect(10,150,501,551))
self.ui.txtUsername.setVisible(True)
self.ui.txtPassword.setVisible(True)
self.ui.lblUsername.setVisible(True)
self.ui.lblPassword.setVisible(True)
self.resize(516, 704)
# GridLayout reset (StoredQueries)
def layout_reset(self):
for qlabel in self.parameter_labels:
self.ui.gridLayout.removeWidget(qlabel)
qlabel.setParent(None) # http://www.riverbankcomputing.com/pipermail/pyqt/2008-March/018803.html
for qlineedit in self.parameter_lineedits:
self.ui.gridLayout.removeWidget(qlineedit)
qlineedit.setParent(None) # http://www.riverbankcomputing.com/pipermail/pyqt/2008-March/018803.html
del self.parameter_labels[:]
del self.parameter_lineedits[:]
self.columnid = 0
# GridLayout addParameter (StoredQueries)
def layout_add_parameter(self, storedqueryparameter):
qlineedit = QtWidgets.QLineEdit()
qlabelname = QtWidgets.QLabel()
qlabelname.setText(storedqueryparameter.getName())
qlabeltype = QtWidgets.QLabel()
qlabeltype.setText(storedqueryparameter.getType().replace("xsd:", ""))
self.ui.gridLayout.addWidget(qlabelname, self.columnid, 0)
self.ui.gridLayout.addWidget(qlineedit, self.columnid, 1)
self.ui.gridLayout.addWidget(qlabeltype, self.columnid, 2)
self.columnid = self.columnid + 1
self.parameter_labels.append(qlabelname)
self.parameter_labels.append(qlabeltype)
self.parameter_lineedits.append(qlineedit)
# newHeight = self.geometry().height() + 21
# self.resize(self.geometry().width(), newHeight)
def lock_ui(self):
self.ui.cmdGetCapabilities.setEnabled(False)
self.ui.cmdListStoredQueries.setEnabled(False)
self.ui.cmdGetFeature.setEnabled(False)
self.ui.cmbFeatureType.setEnabled(False)
self.show_metadata_button(False)
self.show_extent_button(False)
def unlock_ui(self):
self.ui.cmdGetCapabilities.setEnabled(True)
self.ui.cmdListStoredQueries.setEnabled(True)
self.ui.cmdGetFeature.setEnabled(True)
self.ui.cmbFeatureType.setEnabled(True)
self.show_metadata_button(True)
self.show_extent_button(True)
def show_metadata_button(self, enabled):
if enabled:
if self.querytype == "adhocquery":
featuretype = self.featuretypes[self.ui.cmbFeatureType.currentText()]
if featuretype.getMetadataUrl():
if len(featuretype.getMetadataUrl()) > 0:
self.ui.cmdMetadata.setEnabled(True)
else:
self.ui.cmdMetadata.setEnabled(False)
else:
self.ui.cmdMetadata.setEnabled(False)
else:
self.ui.cmdMetadata.setEnabled(False)
def show_extent_button(self, enabled):
if enabled:
if self.querytype == "adhocquery":
featuretype = self.featuretypes[self.ui.cmbFeatureType.currentText()]
if featuretype.getWgs84BoundingBoxEast():
if float(featuretype.getWgs84BoundingBoxEast()) > 0.0:
self.ui.cmdExtent.setEnabled(True)
else:
self.ui.cmdExtent.setEnabled(False)
else:
self.ui.cmdExtent.setEnabled(False)
else:
self.ui.cmdExtent.setEnabled(False)
def show_extent(self):
featuretype = self.featuretypes[self.ui.cmbFeatureType.currentText()]
self.create_layer(featuretype)
def create_layer(self, featuretype):
layer = QgsVectorLayer("polygon?crs=epsg:4326&", featuretype.getName() + " (Extent)", "memory")
QgsProject.instance().addMapLayer(layer)
e = featuretype.getWgs84BoundingBoxEast()
s = featuretype.getWgs84BoundingBoxSouth()
w = featuretype.getWgs84BoundingBoxWest()
n = featuretype.getWgs84BoundingBoxNorth()
wkt = "POLYGON((" + e + " " + s + "," + e + " " + n + "," + w + " " + n + "," + w + " " + s + "," + e + " " + s + "))"
geom = QgsGeometry.fromWkt(wkt)
feature = QgsFeature()
feature.setGeometry(geom)
features = [feature]
layer.dataProvider().addFeatures(features)
layer.updateExtents()
layer.reload()
self.parent.iface.mapCanvas().refresh()
self.parent.iface.zoomToActiveLayer()
def show_metadata(self):
featuretype = self.featuretypes[self.ui.cmbFeatureType.currentText()]
url = featuretype.getMetadataUrl()
if url == '':
QtWidgets.QMessageBox.critical(self, "Metadata Error", "No metadata URL in FeatureType")
return
url = QtCore.QUrl(url)
self.startMetadataRequest(url)
"""
############################################################################################################################
# UTIL
############################################################################################################################
"""
def logMessage(self, message, level=Qgis.Info):
if 'QgsMessageLog' in globals():
QgsMessageLog.logMessage(message, "Wfs20Client", level)
def get_url(self):
defaultwfs = self.settings.value("/Wfs20Client/defaultWfs")
if defaultwfs:
return defaultwfs
else:
return "http://geoserv.weichand.de:8080/geoserver/wfs"
def get_featurelimit(self):
defaultfeaturelimit = self.settings.value("/Wfs20Client/defaultFeatureLimit")
if defaultfeaturelimit:
return defaultfeaturelimit
else:
return "1000"
def get_temppath(self, filename):
tmpdir = os.path.join(tempfile.gettempdir(),'wfs20client')
if not os.path.exists(tmpdir):
os.makedirs(tmpdir)
tmpfile= os.path.join(tmpdir, filename)
return tmpfile
# check for OWS-Exception
def is_exception(self, root):
for namespace in ["{http://www.opengis.net/ows}", "{http://www.opengis.net/ows/1.1}"]:
# check correct Rootelement
if root.tag == "{0}ExceptionReport".format(namespace):
for exception in root.findall("{0}Exception".format(namespace)):
for exception_text in exception.findall("{0}ExceptionText".format(namespace)):
QtWidgets.QMessageBox.critical(self, "OWS Exception", "OWS Exception returned from the WFS:<br>"+ str(exception_text.text))
self.ui.lblMessage.setText("")
return True
return False
# check for correct WFS version (only WFS 2.0 supported)
def is_wfs20_capabilties(self, root):
if self.is_exception(root):
return False
if root.tag == "{0}WFS_Capabilities".format("{http://www.opengis.net/wfs/2.0}"):
return True
if root.tag == "{0}WFS_Capabilities".format("{http://www.opengis.net/wfs}"):
QtWidgets.QMessageBox.warning(self, "Wrong WFS Version", "This Plugin has dedicated support for WFS 2.0!")
self.ui.lblMessage.setText("")
return False
QtWidgets.QMessageBox.critical(self, "Error", "Not a valid WFS GetCapabilities-Response!")
self.ui.lblMessage.setText("")
return False
# Check for empty GetFeature result
def is_empty_response(self, root):
# deegree 3.2: numberMatched="unknown" does return numberReturned="0" instead of numberReturned="unknown"
# https://portal.opengeospatial.org/files?artifact_id=43925
if not root.get("numberMatched") == "unknown":
# no Features returned?
if root.get("numberReturned") == "0":
return True
return False
# Hack to fix version/acceptversions Request-Parameter
def fix_acceptversions(self, onlineresource, connector):
return "{0}service=WFS&acceptversions=2.0.0&request=GetCapabilities".format(connector)
# Determine namespaces in the capabilities (including non-used)
def get_namespace_map(self, xml):
xml = str(xml)
nsmap = {}
for i in [m.start() for m in re.finditer('xmlns:', xml)]:
j = i + 6
prefix = xml[j:xml.find("=", j)]
k = xml.find("\"", j)
uri = xml[k + 1:xml.find("\"", k + 1)]
prefix = prefix.strip()
# uri = uri.replace("\"","")
uri = uri.strip()
# text+= prefix + " " + uri + "\n"
nsmap[prefix] = uri
return nsmap
#############################################################################################################
# QHttp GetFeature-Request - http://stackoverflow.com/questions/6852038/threading-in-pyqt4
#############################################################################################################
# QHttp Slot
def downloadFile(self, onlineResource, queryString, fileName):
self.lock_ui()
url = QtCore.QUrl(onlineResource)
if QtCore.QFile.exists(fileName):
QtCore.QFile.remove(fileName)
self.outFile = QtCore.QFile(fileName)
if not self.outFile.open(QtCore .QIODevice.WriteOnly):
QtWidgets.QMessageBox.information(self, 'Error', 'Unable to save the file %s: %s.' % (fileName, self.outFile.errorString()))
self.outFile = None
return
self.httpRequestAborted = False
self.ui.progressBar.setVisible(True)
url.setUrl(onlineResource + queryString)
self.startRequest(url)
def startRequest(self, url):
self.ui.progressBar.setMaximum(100)
self.ui.progressBar.setValue(0)
self.reply = self.qnam.get(QNetworkRequest(url))
self.reply.finished.connect(self.httpRequestFinished)
self.reply.readyRead.connect(self.httpReadyRead)
self.reply.downloadProgress.connect(self.updateDataReadProgress)
def httpReadyRead(self):
if self.outFile is not None:
self.outFile.write(self.reply.readAll())
# Currently unused
def cancelDownload(self):
self.abort_request()
self.close()
self.ui.progressBar.setMaximum(100)
self.ui.progressBar.setValue(0)
self.unlock_ui()
# QHttp Slot
def httpRequestFinished(self):
if self.httpRequestAborted:
if self.outFile is not None:
self.outFile.close()
self.outFile.remove()
self.outFile = None
self.reply.deleteLater()
self.reply = None
self.ui.progressBar.hide()
return
self.outFile.flush()
self.outFile.close()
self.ui.progressBar.setMaximum(100)
self.ui.progressBar.setValue(100)
# Parse and check only small files
if os.path.getsize(str(self.outFile.fileName())) < 5000:
try:
root = ElementTree.parse(str(self.outFile.fileName())).getroot()
if root and not self.is_exception(root):
if not self.is_empty_response(root):
self.load_vector_layer(str(self.outFile.fileName()), self.ui.cmbFeatureType.currentText())
else:
QtWidgets.QMessageBox.information(self, "Information", "0 Features returned!")
self.ui.lblMessage.setText("")
except ElementTree.ParseError as err:
QtWidgets.QMessageBox.critical(
self,
"XML Parsing error",
"The response could not be read:\n{0}".format(err.msg)
)
else:
self.load_vector_layer(str(self.outFile.fileName()), self.ui.cmbFeatureType.currentText())
self.unlock_ui()
# QHttp Slot
# Check for genuine error conditions.Gz
def readResponseHeader(self, responseHeader):
if responseHeader.statusCode() not in (200, 300, 301, 302, 303, 307):
QtWidgets.QMessageBox.critical(self, 'Error',
'Download failed: %s.' % responseHeader.reasonPhrase())
self.ui.lblMessage.setText("")
self.abort_request()
def updateDataReadProgress(self, bytesRead, totalBytes):
if self.httpRequestAborted:
return
self.ui.progressBar.setMaximum(totalBytes)
self.ui.progressBar.setValue(bytesRead)
self.ui.lblMessage.setText(
"Please wait while downloading - {0}/{1} Bytes downloaded!".format(str(bytesRead), str(totalBytes))
)
# QHttp Slot
def authenticationRequired(self, reply, authenticator):
use_authentication = self.ui.chkAuthentication.isChecked()
username = self.ui.txtUsername.text().strip()
password = self.ui.txtPassword.text().strip()
previousUsername = authenticator.user()
previousPassword = authenticator.password()
terminate_request = False
if not(use_authentication):
QtWidgets.QMessageBox.critical(
self,
"Authentication required",
"Authentication is required for this request"
)
self.ui.chkAuthentication.setChecked(True)
self.update_authentication()
self.ui.txtUsername.setFocus()
terminate_request = True
if username == '' and not terminate_request:
QtWidgets.QMessageBox.critical(
self,
"Authentication required",
"Please enter your username for this request"
)
self.ui.txtUsername.setFocus()
terminate_request = True
if username == previousUsername and password == previousPassword and not terminate_request:
QtWidgets.QMessageBox.critical(
self,
"Authentication failed",
"Authentication with username/password failed - please check and try again"
)
self.ui.txtUsername.setFocus()
terminate_request = True
if terminate_request:
self.httpRequestAborted = True
reply.abort()
return
authenticator.setUser(username)
authenticator.setPassword(password)
self.logMessage("Using username/password")
def sslErrors(self, reply, errors):
errorString = ""
for error in errors:
errorString += " * " + error.errorString() + "\n"
ret = QtWidgets.QMessageBox.question(
self,
"Certificate validation error",
"The following SSL validation errors have been reported:\n\n%s\n" \
"This may indicate a problem with the server and/or its certificate.\n\n" \
"Do you wish to continue anyway?" % errorString,
QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No
)
if ret == QtWidgets.QMessageBox.Yes:
self.logMessage("Ignoring SSL errors", Qgis.Warning)
reply.ignoreSslErrors()
else:
self.httpRequestAborted = True
def abort_request(self):
if self.reply is not None:
self.httpRequestAborted = True
self.reply.abort()
self.reply.deleteLater()
self.reply = None
def load_vector_layer(self, filename, layername):
self.ui.lblMessage.setText("Loading GML - Please wait!")
self.logger.debug("### LOADING GML ###")
# Configure OGR/GDAL GML-Driver