Merge branch 'abbradar-pac'

13 files changed, 804 insertions, 16 deletions

diff --git a/CHANGELOG.asciidoc b/CHANGELOG.asciidoc
index 054eb3bd1..3b68428e8 100644
--- a/CHANGELOG.asciidoc
+++ b/CHANGELOG.asciidoc
@@ -20,6 +20,8 @@ v0.9.0 (unreleased)
 Added
 ~~~~~
 
+- *New dependency:* qutebrowser now depends on the Qt Quick module, which is
+   packaged separately in some distributions.
 - New `:rl-backward-kill-word` command which does what `:rl-unix-word-rubout`
   did before v0.8.0.
 - New `:rl-unix-filename-rubout` command which is similar to readline's
@@ -54,6 +56,7 @@ Added
   `user-stylesheet` setting.
 - New `general -> default-open-dispatcher` setting to configure what to open
   downloads with (instead of e.g. `xdg-open` on Linux).
+- Support for PAC (proxy autoconfig) with QtWebKit
 
 Changed
 ~~~~~~~
diff --git a/README.asciidoc b/README.asciidoc
index de96063ab..ef255fb47 100644
--- a/README.asciidoc
+++ b/README.asciidoc
@@ -196,6 +196,7 @@ Contributors, sorted by the number of commits in descending order:
 * Tomasz Kramkowski
 * Samuel Walladge
 * Peter Rice
+* Nikolay Amiantov
 * Ismail S
 * Halfwit
 * Fritz Reichwald
diff --git a/qutebrowser/browser/webkit/network/networkmanager.py b/qutebrowser/browser/webkit/network/networkmanager.py
index 477a9958a..5e26893f5 100644
--- a/qutebrowser/browser/webkit/network/networkmanager.py
+++ b/qutebrowser/browser/webkit/network/networkmanager.py
@@ -396,6 +396,14 @@ class NetworkManager(QNetworkAccessManager):
         Return:
             A QNetworkReply.
         """
+        proxy_factory = objreg.get('proxy-factory', None)
+        if proxy_factory is not None:
+            proxy_error = proxy_factory.get_error()
+            if proxy_error is not None:
+                return networkreply.ErrorNetworkReply(
+                    req, proxy_error, QNetworkReply.UnknownProxyError,
+                    self)
+
         scheme = req.url().scheme()
         if scheme in self._scheme_handlers:
             result = self._scheme_handlers[scheme].createRequest(
diff --git a/qutebrowser/browser/webkit/network/pac.py b/qutebrowser/browser/webkit/network/pac.py
new file mode 100644
index 000000000..dfa4d42d6
--- /dev/null
+++ b/qutebrowser/browser/webkit/network/pac.py
@@ -0,0 +1,305 @@
+# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
+
+# Copyright 2016 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
+#
+# This file is part of qutebrowser.
+#
+# qutebrowser 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 3 of the License, or
+# (at your option) any later version.
+#
+# qutebrowser 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with qutebrowser.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Evaluation of PAC scripts."""
+
+import sys
+import functools
+
+from PyQt5.QtCore import (QObject, pyqtSignal, pyqtSlot)
+from PyQt5.QtNetwork import (QNetworkProxy, QNetworkRequest, QHostInfo,
+                             QNetworkReply, QNetworkAccessManager,
+                             QHostAddress)
+from PyQt5.QtQml import QJSEngine, QJSValue
+
+from qutebrowser.utils import log, utils, qtutils
+
+
+class ParseProxyError(Exception):
+
+    """Error while parsing PAC result string."""
+
+    pass
+
+
+class EvalProxyError(Exception):
+
+    """Error while evaluating PAC script."""
+
+    pass
+
+
+def _js_slot(*args):
+    """Wrap a methods as a JavaScript function.
+
+    Register a PACContext method as a JavaScript function, and catch
+    exceptions returning them as JavaScript Error objects.
+
+    Args:
+        args: Types of method arguments.
+
+    Return: Wrapped method.
+    """
+    def _decorator(method):
+        @functools.wraps(method)
+        def new_method(self, *args, **kwargs):
+            try:
+                return method(self, *args, **kwargs)
+            except:
+                e = str(sys.exc_info()[0])
+                log.network.exception("PAC evaluation error")
+                # pylint: disable=protected-access
+                return self._error_con.callAsConstructor([e])
+                # pylint: enable=protected-access
+        return pyqtSlot(*args, result=QJSValue)(new_method)
+    return _decorator
+
+
+class _PACContext(QObject):
+
+    """Implementation of PAC API functions that require native calls.
+
+    See https://developer.mozilla.org/en-US/docs/Mozilla/Projects/Necko/Proxy_Auto-Configuration_(PAC)_file
+    """
+
+    JS_DEFINITIONS = """
+        function dnsResolve(host) {
+            return PAC.dnsResolve(host);
+        }
+
+        function myIpAddress() {
+            return PAC.myIpAddress();
+        }
+    """
+
+    def __init__(self, engine):
+        """Create a new PAC API implementation instance.
+
+        Args:
+            engine: QJSEngine which is used for running PAC.
+        """
+        super().__init__(parent=engine)
+        self._engine = engine
+        self._error_con = engine.globalObject().property("Error")
+
+    @_js_slot(str)
+    def dnsResolve(self, host):
+        """Resolve a DNS hostname.
+
+        Resolves the given DNS hostname into an IP address, and returns it
+        in the dot-separated format as a string.
+
+        Args:
+            host: hostname to resolve.
+        """
+        ips = QHostInfo.fromName(host)
+        if ips.error() != QHostInfo.NoError or not ips.addresses():
+            err_f = "Failed to resolve host during PAC evaluation: {}"
+            log.network.info(err_f.format(host))
+            return QJSValue(QJSValue.NullValue)
+        else:
+            return ips.addresses()[0].toString()
+
+    @_js_slot()
+    def myIpAddress(self):
+        """Get host IP address.
+
+        Return the server IP address of the current machine, as a string in
+        the dot-separated integer format.
+        """
+        return QHostAddress(QHostAddress.LocalHost).toString()
+
+
+class PACResolver(object):
+
+    """Evaluate PAC script files and resolve proxies."""
+
+    @staticmethod
+    def _parse_proxy_host(host_str):
+        host, _colon, port_str = host_str.partition(':')
+        try:
+            port = int(port_str)
+        except ValueError:
+            raise ParseProxyError("Invalid port number")
+        return (host, port)
+
+    @staticmethod
+    def _parse_proxy_entry(proxy_str):
+        """Parse one proxy string entry, as described in PAC specification."""
+        config = [c.strip() for c in proxy_str.split(' ') if c]
+        if not config:
+            raise ParseProxyError("Empty proxy entry")
+        elif config[0] == "DIRECT":
+            if len(config) != 1:
+                raise ParseProxyError("Invalid number of parameters for " +
+                                      "DIRECT")
+            return QNetworkProxy(QNetworkProxy.NoProxy)
+        elif config[0] == "PROXY":
+            if len(config) != 2:
+                raise ParseProxyError("Invalid number of parameters for PROXY")
+            host, port = PACResolver._parse_proxy_host(config[1])
+            return QNetworkProxy(QNetworkProxy.HttpProxy, host, port)
+        elif config[0] == "SOCKS":
+            if len(config) != 2:
+                raise ParseProxyError("Invalid number of parameters for SOCKS")
+            host, port = PACResolver._parse_proxy_host(config[1])
+            return QNetworkProxy(QNetworkProxy.Socks5Proxy, host, port)
+        else:
+            err = "Unknown proxy type: {}"
+            raise ParseProxyError(err.format(config[0]))
+
+    @staticmethod
+    def _parse_proxy_string(proxy_str):
+        proxies = proxy_str.split(';')
+        return [PACResolver._parse_proxy_entry(x) for x in proxies]
+
+    def _evaluate(self, js_code, js_file):
+        ret = self._engine.evaluate(js_code, js_file)
+        if ret.isError():
+            err = "JavaScript error while evaluating PAC file: {}"
+            raise EvalProxyError(err.format(ret.toString()))
+
+    def __init__(self, pac_str):
+        """Create a PAC resolver.
+
+        Args:
+            pac_str: JavaScript code containing PAC resolver.
+        """
+        self._engine = QJSEngine()
+
+        self._ctx = _PACContext(self._engine)
+        self._engine.globalObject().setProperty(
+            "PAC", self._engine.newQObject(self._ctx))
+        self._evaluate(_PACContext.JS_DEFINITIONS, "pac_js_definitions")
+        self._evaluate(utils.read_file("javascript/pac_utils.js"), "pac_utils")
+        proxy_config = self._engine.newObject()
+        proxy_config.setProperty("bindings", self._engine.newObject())
+        self._engine.globalObject().setProperty("ProxyConfig", proxy_config)
+
+        self._evaluate(pac_str, "pac")
+        global_js_object = self._engine.globalObject()
+        self._resolver = global_js_object.property("FindProxyForURL")
+        if not self._resolver.isCallable():
+            err = "Cannot resolve FindProxyForURL function, got '{}' instead"
+            raise EvalProxyError(err.format(self._resolver.toString()))
+
+    def resolve(self, query):
+        """Resolve a proxy via PAC.
+
+        Args:
+            query: QNetworkProxyQuery.
+
+        Return:
+            A list of QNetworkProxy objects in order of preference.
+        """
+        result = self._resolver.call([query.url().toString(),
+                                      query.peerHostName()])
+        result_str = result.toString()
+        if not result.isString():
+            err = "Got strange value from FindProxyForURL: '{}'"
+            raise EvalProxyError(err.format(result_str))
+        return self._parse_proxy_string(result_str)
+
+
+class PACFetcher(QObject):
+
+    """Asynchronous fetcher of PAC files."""
+
+    finished = pyqtSignal()
+
+    def __init__(self, url, parent=None):
+        """Resolve a PAC proxy from URL.
+
+        Args:
+            url: QUrl of a PAC proxy.
+        """
+        super().__init__(parent)
+
+        pac_prefix = "pac+"
+
+        assert url.scheme().startswith(pac_prefix)
+        url.setScheme(url.scheme()[len(pac_prefix):])
+
+        self._manager = QNetworkAccessManager()
+        self._manager.setProxy(QNetworkProxy(QNetworkProxy.NoProxy))
+        self._reply = self._manager.get(QNetworkRequest(url))
+        self._reply.finished.connect(self._finish)
+        self._pac = None
+        self._error_message = None
+
+    @pyqtSlot()
+    def _finish(self):
+        if self._reply.error() != QNetworkReply.NoError:
+            error = "Can't fetch PAC file from URL, error code {}: {}"
+            self._error_message = error.format(
+                self._reply.error(), self._reply.errorString())
+            log.network.error(self._error_message)
+        else:
+            try:
+                pacscript = bytes(self._reply.readAll()).decode("utf-8")
+            except UnicodeError as e:
+                error = "Invalid encoding of a PAC file: {}"
+                self._error_message = error.format(e)
+                log.network.exception(self._error_message)
+            try:
+                self._pac = PACResolver(pacscript)
+                log.network.debug("Successfully evaluated PAC file.")
+            except EvalProxyError as e:
+                error = "Error in PAC evaluation: {}"
+                self._error_message = error.format(e)
+                log.network.exception(self._error_message)
+        self._manager = None
+        self._reply = None
+        self.finished.emit()
+
+    def _wait(self):
+        """Wait until a reply from the remote server is received."""
+        if self._manager is not None:
+            loop = qtutils.EventLoop()
+            self.finished.connect(loop.quit)
+            loop.exec_()
+
+    def fetch_error(self):
+        """Check if PAC script is successfully fetched.
+
+        Return None iff PAC script is downloaded and evaluated successfully,
+        error string otherwise.
+        """
+        self._wait()
+        return self._error_message
+
+    def resolve(self, query):
+        """Resolve a query via PAC.
+
+        Args: QNetworkProxyQuery.
+
+        Return a list of QNetworkProxy objects in order of preference.
+        """
+        self._wait()
+        try:
+            return self._pac.resolve(query)
+        except (EvalProxyError, ParseProxyError) as e:
+            log.network.exception("Error in PAC resolution: {}.".format(e))
+            # .invalid is guaranteed to be inaccessible in RFC 6761.
+            # Port 9 is for DISCARD protocol -- DISCARD servers act like
+            # /dev/null.
+            # Later NetworkManager.createRequest will detect this and display
+            # an error message.
+            error_host = "pac-resolve-error.qutebrowser.invalid"
+            return QNetworkProxy(QNetworkProxy.HttpProxy, error_host, 9)
diff --git a/qutebrowser/browser/webkit/network/proxy.py b/qutebrowser/browser/webkit/network/proxy.py
index 2469bd0c7..db52482d2 100644
--- a/qutebrowser/browser/webkit/network/proxy.py
+++ b/qutebrowser/browser/webkit/network/proxy.py
@@ -23,17 +23,33 @@
 from PyQt5.QtNetwork import QNetworkProxy, QNetworkProxyFactory
 
 from qutebrowser.config import config, configtypes
+from qutebrowser.utils import objreg
+from qutebrowser.browser.webkit.network import pac
 
 
 def init():
     """Set the application wide proxy factory."""
-    QNetworkProxyFactory.setApplicationProxyFactory(ProxyFactory())
+    proxy_factory = ProxyFactory()
+    objreg.register('proxy-factory', proxy_factory)
+    QNetworkProxyFactory.setApplicationProxyFactory(proxy_factory)
 
 
 class ProxyFactory(QNetworkProxyFactory):
 
     """Factory for proxies to be used by qutebrowser."""
 
+    def get_error(self):
+        """Check if proxy can't be resolved.
+
+        Return:
+           None if proxy is correct, otherwise an error message.
+        """
+        proxy = config.get('network', 'proxy')
+        if isinstance(proxy, pac.PACFetcher):
+            return proxy.fetch_error()
+        else:
+            return None
+
     def queryProxy(self, query):
         """Get the QNetworkProxies for a query.
 
@@ -46,6 +62,8 @@ class ProxyFactory(QNetworkProxyFactory):
         proxy = config.get('network', 'proxy')
         if proxy is configtypes.SYSTEM_PROXY:
             proxies = QNetworkProxyFactory.systemProxyForQuery(query)
+        elif isinstance(proxy, pac.PACFetcher):
+            proxies = proxy.resolve(query)
         else:
             proxies = [proxy]
         for p in proxies:
diff --git a/qutebrowser/config/configtypes.py b/qutebrowser/config/configtypes.py
index 457781e77..7c5f9721c 100644
--- a/qutebrowser/config/configtypes.py
+++ b/qutebrowser/config/configtypes.py
@@ -28,6 +28,7 @@ import itertools
 import collections
 import warnings
 import datetime
+import functools
 
 from PyQt5.QtCore import QUrl, Qt
 from PyQt5.QtGui import QColor, QFont
@@ -37,6 +38,7 @@ from PyQt5.QtWidgets import QTabWidget, QTabBar
 from qutebrowser.commands import cmdutils
 from qutebrowser.config import configexc
 from qutebrowser.utils import standarddir, utils
+from qutebrowser.browser.webkit.network import pac
 
 
 SYSTEM_PROXY = object()  # Return value for Proxy type
@@ -1014,14 +1016,36 @@ class ShellCommand(BaseType):
             return shlex.split(value)
 
 
+def proxy_from_url(typ, url):
+    """Create a QNetworkProxy from QUrl and a proxy type.
+
+    Args:
+        typ: QNetworkProxy::ProxyType.
+        url: URL of a proxy (possibly with credentials).
+
+    Return:
+        New QNetworkProxy.
+    """
+    proxy = QNetworkProxy(typ, url.host())
+    if url.port() != -1:
+        proxy.setPort(url.port())
+    if url.userName():
+        proxy.setUser(url.userName())
+    if url.password():
+        proxy.setPassword(url.password())
+    return proxy
+
+
 class Proxy(BaseType):
 
     """A proxy URL or special value."""
 
     PROXY_TYPES = {
-        'http': QNetworkProxy.HttpProxy,
-        'socks': QNetworkProxy.Socks5Proxy,
-        'socks5': QNetworkProxy.Socks5Proxy,
+        'http': functools.partial(proxy_from_url, QNetworkProxy.HttpProxy),
+        'pac+http': pac.PACFetcher,
+        'pac+https': pac.PACFetcher,
+        'socks': functools.partial(proxy_from_url, QNetworkProxy.Socks5Proxy),
+        'socks5': functools.partial(proxy_from_url, QNetworkProxy.Socks5Proxy),
     }
 
     def __init__(self, none_ok=False):
@@ -1053,6 +1077,7 @@ class Proxy(BaseType):
         out.append(('socks://', 'SOCKS proxy URL'))
         out.append(('socks://localhost:9050/', 'Tor via SOCKS'))
         out.append(('http://localhost:8080/', 'Local HTTP proxy'))
+        out.append(('pac+https://example.com/proxy.pac', 'Proxy autoconfiguration file URL'))
         return out
 
     def transform(self, value):
@@ -1063,15 +1088,7 @@ class Proxy(BaseType):
         elif value == 'none':
             return QNetworkProxy(QNetworkProxy.NoProxy)
         url = QUrl(value)
-        typ = self.PROXY_TYPES[url.scheme()]
-        proxy = QNetworkProxy(typ, url.host())
-        if url.port() != -1:
-            proxy.setPort(url.port())
-        if url.userName():
-            proxy.setUser(url.userName())
-        if url.password():
-            proxy.setPassword(url.password())
-        return proxy
+        return self.PROXY_TYPES[url.scheme()](url)
 
 
 class SearchEngineName(BaseType):
diff --git a/qutebrowser/javascript/.eslintignore b/qutebrowser/javascript/.eslintignore
new file mode 100644
index 000000000..ca4d3c667
--- /dev/null
+++ b/qutebrowser/javascript/.eslintignore
@@ -0,0 +1,2 @@
+# Upstream Mozilla's code
+pac_utils.js
diff --git a/qutebrowser/javascript/pac_utils.js b/qutebrowser/javascript/pac_utils.js
new file mode 100644
index 000000000..a6102df9f
--- /dev/null
+++ b/qutebrowser/javascript/pac_utils.js
@@ -0,0 +1,257 @@
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is mozilla.org code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Akhil Arora <akhil.arora@sun.com>
+ *   Tomi Leppikangas <Tomi.Leppikangas@oulu.fi>
+ *   Darin Fisher <darin@meer.net>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+/*
+   Script for Proxy Auto Config in the new world order.
+       - Gagan Saksena 04/24/00 
+*/
+
+function dnsDomainIs(host, domain) {
+    return (host.length >= domain.length &&
+            host.substring(host.length - domain.length) == domain);
+}
+
+function dnsDomainLevels(host) {
+    return host.split('.').length-1;
+}
+
+function convert_addr(ipchars) {
+    var bytes = ipchars.split('.');
+    var result = ((bytes[0] & 0xff) << 24) |
+                 ((bytes[1] & 0xff) << 16) |
+                 ((bytes[2] & 0xff) <<  8) |
+                  (bytes[3] & 0xff);
+    return result;
+}
+
+function isInNet(ipaddr, pattern, maskstr) {
+    var test = /^(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$/
+               .exec(ipaddr);
+    if (test == null) {
+        ipaddr = dnsResolve(ipaddr);
+        if (ipaddr == null)
+            return false;
+    } else if (test[1] > 255 || test[2] > 255 ||
+               test[3] > 255 || test[4] > 255) {
+        return false;    // not an IP address
+    }
+    var host = convert_addr(ipaddr);
+    var pat  = convert_addr(pattern);
+    var mask = convert_addr(maskstr);
+    return ((host & mask) == (pat & mask));
+}
+
+function isPlainHostName(host) {
+    return (host.search('\\\\.') == -1);
+}
+
+function isResolvable(host) {
+    var ip = dnsResolve(host);
+    return (ip != null);
+}
+
+function localHostOrDomainIs(host, hostdom) {
+    return (host == hostdom) ||
+           (hostdom.lastIndexOf(host + '.', 0) == 0);
+}
+
+function shExpMatch(url, pattern) {
+   pattern = pattern.replace(/\\./g, '\\\\.');
+   pattern = pattern.replace(/\\*/g, '.*');
+   pattern = pattern.replace(/\\?/g, '.');
+   var newRe = new RegExp('^'+pattern+'$');
+   return newRe.test(url);
+}
+
+var wdays = {SUN: 0, MON: 1, TUE: 2, WED: 3, THU: 4, FRI: 5, SAT: 6};
+
+var months = {JAN: 0, FEB: 1, MAR: 2, APR: 3, MAY: 4, JUN: 5, JUL: 6,
+              AUG: 7, SEP: 8, OCT: 9, NOV: 10, DEC: 11};
+
+function weekdayRange() {
+    function getDay(weekday) {
+        if (weekday in wdays) {
+            return wdays[weekday];
+        }
+        return -1;
+    }
+    var date = new Date();
+    var argc = arguments.length;
+    var wday;
+    if (argc < 1)
+        return false;
+    if (arguments[argc - 1] == 'GMT') {
+        argc--;
+        wday = date.getUTCDay();
+    } else {
+        wday = date.getDay();
+    }
+    var wd1 = getDay(arguments[0]);
+    var wd2 = (argc == 2) ? getDay(arguments[1]) : wd1;
+    return (wd1 == -1 || wd2 == -1) ? false
+                                    : (wd1 <= wday && wday <= wd2);
+}
+
+function dateRange() {
+    function getMonth(name) {
+        if (name in months) {
+            return months[name];
+        }
+        return -1;
+    }
+    var date = new Date();
+    var argc = arguments.length;
+    if (argc < 1) {
+        return false;
+    }
+    var isGMT = (arguments[argc - 1] == 'GMT');
+
+    if (isGMT) {
+        argc--;
+    }
+    // function will work even without explict handling of this case
+    if (argc == 1) {
+        var tmp = parseInt(arguments[0]);
+        if (isNaN(tmp)) {
+            return ((isGMT ? date.getUTCMonth() : date.getMonth()) ==
+                    getMonth(arguments[0]));
+        } else if (tmp < 32) {
+            return ((isGMT ? date.getUTCDate() : date.getDate()) == tmp);
+        } else {
+            return ((isGMT ? date.getUTCFullYear() : date.getFullYear()) ==
+                    tmp);
+        }
+    }
+    var year = date.getFullYear();
+    var date1, date2;
+    date1 = new Date(year,  0,  1,  0,  0,  0);
+    date2 = new Date(year, 11, 31, 23, 59, 59);
+    var adjustMonth = false;
+    for (var i = 0; i < (argc >> 1); i++) {
+        var tmp = parseInt(arguments[i]);
+        if (isNaN(tmp)) {
+            var mon = getMonth(arguments[i]);
+            date1.setMonth(mon);
+        } else if (tmp < 32) {
+            adjustMonth = (argc <= 2);
+            date1.setDate(tmp);
+        } else {
+            date1.setFullYear(tmp);
+        }
+    }
+    for (var i = (argc >> 1); i < argc; i++) {
+        var tmp = parseInt(arguments[i]);
+        if (isNaN(tmp)) {
+            var mon = getMonth(arguments[i]);
+            date2.setMonth(mon);
+        } else if (tmp < 32) {
+            date2.setDate(tmp);
+        } else {
+            date2.setFullYear(tmp);
+        }
+    }
+    if (adjustMonth) {
+        date1.setMonth(date.getMonth());
+        date2.setMonth(date.getMonth());
+    }
+    if (isGMT) {
+    var tmp = date;
+        tmp.setFullYear(date.getUTCFullYear());
+        tmp.setMonth(date.getUTCMonth());
+        tmp.setDate(date.getUTCDate());
+        tmp.setHours(date.getUTCHours());
+        tmp.setMinutes(date.getUTCMinutes());
+        tmp.setSeconds(date.getUTCSeconds());
+        date = tmp;
+    }
+    return ((date1 <= date) && (date <= date2));
+}
+
+function timeRange() {
+    var argc = arguments.length;
+    var date = new Date();
+    var isGMT= false;
+
+    if (argc < 1) {
+        return false;
+    }
+    if (arguments[argc - 1] == 'GMT') {
+        isGMT = true;
+        argc--;
+    }
+
+    var hour = isGMT ? date.getUTCHours() : date.getHours();
+    var date1, date2;
+    date1 = new Date();
+    date2 = new Date();
+
+    if (argc == 1) {
+        return (hour == arguments[0]);
+    } else if (argc == 2) {
+        return ((arguments[0] <= hour) && (hour <= arguments[1]));
+    } else {
+        switch (argc) {
+        case 6:
+            date1.setSeconds(arguments[2]);
+            date2.setSeconds(arguments[5]);
+        case 4:
+            var middle = argc >> 1;
+            date1.setHours(arguments[0]);
+            date1.setMinutes(arguments[1]);
+            date2.setHours(arguments[middle]);
+            date2.setMinutes(arguments[middle + 1]);
+            if (middle == 2) {
+                date2.setSeconds(59);
+            }
+            break;
+        default:
+          throw 'timeRange: bad number of arguments'
+        }
+    }
+
+    if (isGMT) {
+        date.setFullYear(date.getUTCFullYear());
+        date.setMonth(date.getUTCMonth());
+        date.setDate(date.getUTCDate());
+        date.setHours(date.getUTCHours());
+        date.setMinutes(date.getUTCMinutes());
+        date.setSeconds(date.getUTCSeconds());
+    }
+    return ((date1 <= date) && (date <= date2));
+}
diff --git a/qutebrowser/utils/log.py b/qutebrowser/utils/log.py
index 05163577c..07ec78741 100644
--- a/qutebrowser/utils/log.py
+++ b/qutebrowser/utils/log.py
@@ -94,7 +94,7 @@ LOGGER_NAMES = [
     'commands', 'signals', 'downloads',
     'js', 'qt', 'rfc6266', 'ipc', 'shlexer',
     'save', 'message', 'config', 'sessions',
-    'webelem', 'prompt'
+    'webelem', 'prompt', 'network'
 ]
 
 
@@ -140,6 +140,7 @@ config = logging.getLogger('config')
 sessions = logging.getLogger('sessions')
 webelem = logging.getLogger('webelem')
 prompt = logging.getLogger('prompt')
+network = logging.getLogger('network')
 
 
 ram_handler = None
diff --git a/scripts/dev/ci/travis_install.sh b/scripts/dev/ci/travis_install.sh
index f5d75eed5..5317e2135 100644
--- a/scripts/dev/ci/travis_install.sh
+++ b/scripts/dev/ci/travis_install.sh
@@ -102,7 +102,7 @@ elif [[ $TRAVIS_OS_NAME == osx ]]; then
     exit 0
 fi
 
-pyqt_pkgs="python3-pyqt5 python3-pyqt5.qtwebkit"
+pyqt_pkgs="python3-pyqt5 python3-pyqt5.qtquick python3-pyqt5.qtwebkit"
 
 pip_install pip
 pip_install -r misc/requirements/requirements-tox.txt
diff --git a/tests/unit/browser/webkit/network/test_pac.py b/tests/unit/browser/webkit/network/test_pac.py
new file mode 100644
index 000000000..b99675b6a
--- /dev/null
+++ b/tests/unit/browser/webkit/network/test_pac.py
@@ -0,0 +1,173 @@
+# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
+
+# Copyright 2016 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
+#
+# This file is part of qutebrowser.
+#
+# qutebrowser 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 3 of the License, or
+# (at your option) any later version.
+#
+# qutebrowser 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with qutebrowser.  If not, see <http://www.gnu.org/licenses/>.
+
+import http.server
+import threading
+import logging
+import sys
+import pytest
+
+from PyQt5.QtCore import QUrl, QT_VERSION_STR
+from PyQt5.QtNetwork import (QNetworkProxy, QNetworkProxyQuery, QHostInfo,
+                             QHostAddress)
+
+from qutebrowser.browser.webkit.network import pac
+
+
+pytestmark = pytest.mark.usefixtures('qapp')
+
+
+def _pac_common_test(test_str):
+    fun_str_f = """
+        function FindProxyForURL(domain, host) {{
+            {}
+            return "DIRECT; PROXY 127.0.0.1:8080; SOCKS 192.168.1.1:4444";
+        }}
+    """
+
+    fun_str = fun_str_f.format(test_str)
+    res = pac.PACResolver(fun_str)
+    proxies = res.resolve(QNetworkProxyQuery(QUrl("https://example.com/test")))
+    assert len(proxies) == 3
+    assert proxies[0].type() == QNetworkProxy.NoProxy
+    assert proxies[1].type() == QNetworkProxy.HttpProxy
+    assert proxies[1].hostName() == "127.0.0.1"
+    assert proxies[1].port() == 8080
+    assert proxies[2].type() == QNetworkProxy.Socks5Proxy
+    assert proxies[2].hostName() == "192.168.1.1"
+    assert proxies[2].port() == 4444
+
+
+def _pac_equality_test(call, expected):
+    test_str_f = """
+        var res = ({0});
+        var expected = ({1});
+        if(res !== expected) {{
+            throw new Error("failed test {0}: got '" + res + "', expected '" + expected + "'");
+        }}
+    """
+    _pac_common_test(test_str_f.format(call, expected))
+
+
+def _pac_except_test(caplog, call):
+    test_str_f = """
+        var thrown = false;
+        try {{
+            var res = ({0});
+        }} catch(e) {{
+            thrown = true;
+        }}
+        if(!thrown) {{
+            throw new Error("failed test {0}: got '" + res + "', expected exception");
+        }}
+    """
+    with caplog.at_level(logging.ERROR):
+        _pac_common_test(test_str_f.format(call))
+
+
+def _pac_noexcept_test(call):
+    test_str_f = """
+        var res = ({0});
+    """
+    _pac_common_test(test_str_f.format(call))
+
+
+# pylint: disable=line-too-long, invalid-name
+
+
+@pytest.mark.parametrize("domain, expected", [
+    ("known.domain", "'1.2.3.4'"),
+    ("bogus.domain.foobar", "null")
+])
+def test_dnsResolve(monkeypatch, domain, expected):
+    def mock_fromName(host):
+        info = QHostInfo()
+        if host == "known.domain":
+            info.setAddresses([QHostAddress("1.2.3.4")])
+        return info
+    monkeypatch.setattr(QHostInfo, 'fromName', mock_fromName)
+    _pac_equality_test("dnsResolve('{}')".format(domain), expected)
+
+
+def test_myIpAddress():
+    _pac_equality_test("isResolvable(myIpAddress())", "true")
+
+
+def test_proxyBindings():
+    _pac_equality_test("JSON.stringify(ProxyConfig.bindings)", "'{}'")
+
+
+def test_invalid_port():
+    test_str = """
+        function FindProxyForURL(domain, host) {
+            return "PROXY 127.0.0.1:FOO";
+        }
+    """
+
+    res = pac.PACResolver(test_str)
+    with pytest.raises(pac.ParseProxyError):
+        res.resolve(QNetworkProxyQuery(QUrl("https://example.com/test")))
+
+
+# See https://github.com/The-Compiler/qutebrowser/pull/1891#issuecomment-259222615
+
+try:
+    from PyQt5 import QtWebEngineWidgets
+except ImportError:
+    QtWebEngineWidgets = None
+
+
+@pytest.mark.skipif(QT_VERSION_STR.startswith('5.7') and
+                    QtWebEngineWidgets is not None and
+                    sys.platform == "linux",
+                    reason="Segfaults when run with QtWebEngine tests on Linux")
+def test_fetch():
+    test_str = """
+        function FindProxyForURL(domain, host) {
+            return "DIRECT; PROXY 127.0.0.1:8080; SOCKS 192.168.1.1:4444";
+        }
+    """
+
+    class PACHandler(http.server.BaseHTTPRequestHandler):
+        def do_GET(self):
+            self.send_response(200)
+
+            self.send_header('Content-type', 'application/x-ns-proxy-autoconfig')
+            self.end_headers()
+
+            self.wfile.write(test_str.encode("ascii"))
+
+    ready_event = threading.Event()
+
+    def serve():
+        httpd = http.server.HTTPServer(("127.0.0.1", 8081), PACHandler)
+        ready_event.set()
+        httpd.handle_request()
+        httpd.server_close()
+
+    serve_thread = threading.Thread(target=serve, daemon=True)
+    serve_thread.start()
+    try:
+        ready_event.wait()
+        res = pac.PACFetcher(QUrl("pac+http://127.0.0.1:8081"))
+        assert res.fetch_error() is None
+    finally:
+        serve_thread.join()
+    proxies = res.resolve(QNetworkProxyQuery(QUrl("https://example.com/test")))
+    assert len(proxies) == 3
diff --git a/tests/unit/config/test_configtypes.py b/tests/unit/config/test_configtypes.py
index 77cfdfdee..37e763999 100644
--- a/tests/unit/config/test_configtypes.py
+++ b/tests/unit/config/test_configtypes.py
@@ -1492,6 +1492,8 @@ class TestProxy:
         'http://user:pass@example.com:2323/',
         'socks://user:pass@example.com:2323/',
         'socks5://user:pass@example.com:2323/',
+        'pac+http://example.com/proxy.pac',
+        'pac+https://example.com/proxy.pac',
     ])
     def test_validate_valid(self, klass, val):
         klass(none_ok=True).validate(val)
diff --git a/tox.ini b/tox.ini
index 6c51695dd..b52550056 100644
--- a/tox.ini
+++ b/tox.ini
@@ -183,4 +183,5 @@ commands =
 [testenv:eslint]
 deps =
 whitelist_externals = eslint
-commands = eslint --color qutebrowser/javascript
+changedir = {toxinidir}/qutebrowser/javascript
+commands = eslint --color .