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Add simple local test server convenience classes for unit tests
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dakcarto committed Aug 21, 2013
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# -*- coding: utf-8 -*-
"""Convenience interface to a local QGIS Server, e.g. for unit tests
.. note:: 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.

__author__ = 'Larry Shaffer'
__date__ = '07/15/2013'
__copyright__ = 'Copyright 2013, The QGIS Project'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'

import sys
import os
import ConfigParser
import urllib
import tempfile

# allow import error to be raised if qgis is not on sys.path
from qgis.core import QgsRectangle, QgsCoordinateReferenceSystem
except ImportError, e:
raise ImportError(str(e) + '\n\nPlace path to pyqgis modules on sys.path,'
' or assign to PYTHONPATH')

class ServerNotAccessibleError(Exception):

def __init__(self, cgiurl):
self.msg = """
Local test QGIS Server is not accessible at:

def __str__(self):
return self.msg

class QgisLocalServer(object):

def __init__(self, cgiurl, chkcapa=False):
self.cgiurl = cgiurl
self.params = {} = False

# check capabilities to verify server is accessible
if chkcapa:
params = {
'VERSION': '1.3.0',
'REQUEST': 'GetCapabilities'
if not self.getCapabilities(params, False)[0]:
raise ServerNotAccessibleError(self.cgiurl) = True

def activeServer(self):

def cgiUrl(self):
return self.cgiurl

def getCapabilities(self, params, browser=False):
if (('REQUEST' in params and params['REQUEST'] != 'GetCapabilities') or
'REQUEST' not in params):
params['REQUEST'] = 'GetCapabilities'

self.params = params
url = self.cgiurl + '?' + self._processParams()
self.params = {}

if browser:
return False, ''

res = urllib.urlopen(url)
xml =
success = ('perhaps you left off the .qgs extension' in xml or
'WMS_Capabilities' in xml)
return success, xml

def getMap(self, params, browser=False):
assert, 'Server not acessible'

msg = 'Parameters should be passed in as a dict'
assert isinstance(params, dict), msg

if (('REQUEST' in params and params['REQUEST'] != 'GetMap') or
'REQUEST' not in params):
params['REQUEST'] = 'GetMap'

self.params = params
url = self.cgiurl + '?' + self._processParams()
self.params = {}

if browser:
return False, ''

tmp = tempfile.NamedTemporaryFile(suffix=".png", delete=False)
res = urllib.urlretrieve(url,
filepath = res[0]
success = True
if (res[1].getmaintype() != 'image' or
res[1].getheader('Content-Type') != 'image/png'):
success = False

return success, filepath

def _processParams(self):
# set all keys to uppercase
self.params = dict((k.upper(), v) for k, v in self.params.items())
# convert all convenience objects to compatible strings
# encode params
return urllib.urlencode(self.params, True)

def _convertInstances(self):
if not self.params:
if ('LAYERS' in self.params and
isinstance(self.params['LAYERS'], list)):
self.params['LAYERS'] = ','.join(self.params['LAYERS'])
if ('BBOX' in self.params and
isinstance(self.params['BBOX'], QgsRectangle)):
# not needed for QGIS's 1.3.0 server?
# # invert x, y of rect and set precision to 16
# rect = self.params['BBOX']
# bbox = ','.join(map(lambda x: '{0:0.16f}'.format(x),
# [rect.yMinimum(), rect.xMinimum(),
# rect.yMaximum(), rect.xMaximum()]))
self.params['BBOX'] = \
self.params['BBOX'].toString(1).replace(' : ', ',')

if ('CRS' in self.params and
isinstance(self.params['CRS'], QgsCoordinateReferenceSystem)):
self.params['CRS'] = self.params['CRS'].authid()

class ServerConfigNotAccessibleError(Exception):

def __init__(self, err=''):
self.msg = '\n\n' + str(err) + '\n'
self.msg += """
Local test QGIS Server is not accessible
Check local server configuration settings in:
/<current user>/.qgis2/qgis_local_server.cfg
Adjust settings under the LocalServer section:
protocol = http (recommended)
host = localhost, domain.tld or IP address
port = 80 or a user-defined port above 1024
fcgipath = path to working qgis_mapserv.fcgi as known by server
sourceurl = DO NOT ADJUST
projdir = path WRITEABLE by this user and READABLE by www server
Sample configuration (default):
sourceurl (built) = http://localhost:80/cgi-bin/qgis_mapserv.fcgi
projdir = /var/www/qgis/test-projects

def __str__(self):
return self.msg

class QgisLocalServerConfig(QgisLocalServer):

def __init__(self, cfgdir, chkcapa=False):
msg = 'Server configuration directory required'
assert cfgdir, msg

self.cfgdir = cfgdir
self.cfg = os.path.normpath(os.path.join(self.cfgdir,
if not os.path.exists(self.cfg):
msg = ('Default server configuration file could not be written'
' to {0}'.format(self.cfg))
assert self._writeDefaultServerConfig(), msg

self._checkItemFound('file', self.cfg)
self._checkItemReadable('file', self.cfg)

cgiurl, self.projdir = self._readServerConfig()

self._checkItemFound('project directory', self.projdir)
self._checkItemReadable('project directory', self.projdir)
self._checkItemWriteable('project directory', self.projdir)
super(QgisLocalServerConfig, self).__init__(cgiurl, chkcapa)
except Exception, err:
raise ServerConfigNotAccessibleError(err)

def projectDir(self):
return self.projdir

def getMap(self, params, browser=False):
msg = ('Map request parameters should be passed in as a dict '
'(key case can be mixed)')
assert isinstance(params, dict), msg

params = dict((k.upper(), v) for k, v in params.items())
proj = params['MAP']
except KeyError, e:
raise KeyError(str(e) + '\nMAP not found in parameters dict')

if not os.path.exists(proj):
proj = os.path.join(self.projdir, proj)
msg = 'Project could not be found at {0}'.format(proj)
assert os.path.exists(proj), msg

return super(QgisLocalServerConfig, self).getMap(params, browser)

def _checkItemFound(self, item, path):
msg = ('Server configuration {0} could not be found at:\n'
' {1}'.format(item, path))
assert os.path.exists(path), msg

def _checkItemReadable(self, item, path):
msg = ('Server configuration {0} is not readable from:\n'
' {1}'.format(item, path))
assert os.access(path, os.R_OK), msg

def _checkItemWriteable(self, item, path):
msg = ('Server configuration {0} is not writeable from:\n'
' {1}'.format(item, path))
assert os.access(path, os.W_OK), msg

def _writeDefaultServerConfig(self):
"""Overwrites any existing server configuration file with default"""
# linux: http://localhost/cgi-bin/qgis_mapserv.fcgi? <-- default
# mac: http://localhost/qgis-mapserv/qgis_mapserv.fcgi?
# win: http://localhost/qgis/qgis_mapserv.fcgi?
config = ConfigParser.SafeConfigParser(
'sourceurl': 'http://localhost:80/cgi-bin/qgis_mapserv.fcgi',
'projdir': '/var/www/qgis/test-projects'
config.set('LocalServer', 'protocol', 'http')
config.set('LocalServer', 'host', 'localhost')
config.set('LocalServer', 'port', '80')
config.set('LocalServer', 'fcgipath', '/cgi-bin/qgis_mapserv.fcgi')
config.set('LocalServer', 'sourceurl',
config.set('LocalServer', 'projdir', '/var/www/qgis/test-projects')

with open(self.cfg, 'w+') as configfile:
return os.path.exists(self.cfg)

def _readServerConfig(self):
config = ConfigParser.SafeConfigParser()
url = config.get('LocalServer', 'sourceurl')
projdir = config.get('LocalServer', 'projdir')
return url, projdir

def openInBrowserTab(url):
if sys.platform[:3] in ('win', 'dar'):
import webbrowser
# some Linux OS pause execution on webbrowser open, so background it
import subprocess
cmd = 'import webbrowser;' \
p = subprocess.Popen([sys.executable, "-c", cmd],

if __name__ == '__main__':
qgishome = os.path.join(os.path.expanduser('~'), '.qgis2')
server = QgisLocalServerConfig(qgishome, True)
# print '\nServer accessible and returned capabilities'

# creating crs needs app instance to access /resources/srs.db
# crs = QgsCoordinateReferenceSystem()
# # default for labeling test data sources: WGS 84 / UTM zone 13N
# crs.createFromSrid(32613)
ext = QgsRectangle(606510, 4823130, 612510, 4827130)
params = {
'VERSION': '1.3.0',
'REQUEST': 'GetMap',
'MAP': '/test-projects/tests/tests.qgs',
# layer stacking order for rendering: bottom,to,top
'LAYERS': ['background', 'point'], # or 'background,point'
'STYLES': ',',
'CRS': 'EPSG:32613', # or: QgsCoordinateReferenceSystem obj
'BBOX': ext, # or: '606510,4823130,612510,4827130'
'FORMAT': 'image/png', # or: 'image/png; mode=8bit'
'WIDTH': '600',
'HEIGHT': '400',
'DPI': '72',
'FORMAT_OPTIONS': 'dpi:72',
'IgnoreGetMapUrl': '1'
if 'QGISSERVER_PNG' in os.environ:
# open resultant png with system
res, filepath = server.getMap(params, False)
openInBrowserTab('file://' + filepath)
# open GetMap url in browser
res, filepath = server.getMap(params, True)

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