summaryrefslogtreecommitdiffstats
path: root/Lib/webbrowser.py
blob: bdd6c31196b43e114da361300943ae8e66aeee3a (plain)
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
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
"""Interfaces for launching and remotely controlling Web browsers."""

import os
import sys

__all__ = ["Error", "open", "get", "register"]

class Error(Exception):
    pass

_browsers = {}          # Dictionary of available browser controllers
_tryorder = []          # Preference order of available browsers

def register(name, klass, instance=None):
    """Register a browser connector and, optionally, connection."""
    _browsers[name.lower()] = [klass, instance]

def get(using=None):
    """Return a browser launcher instance appropriate for the environment."""
    if using:
        alternatives = [using]
    else:
        alternatives = _tryorder
    for browser in alternatives:
        if browser.find('%s') > -1:
            # User gave us a command line, don't mess with it.
            return GenericBrowser(browser)
        else:
            # User gave us a browser name.
            try:
                command = _browsers[browser.lower()]
            except KeyError:
                command = _synthesize(browser)
            if command[1] is None:
                return command[0]()
            else:
                return command[1]
    raise Error("could not locate runnable browser")

# Please note: the following definition hides a builtin function.

def open(url, new=0, autoraise=1):
    get().open(url, new, autoraise)

def open_new(url):
    get().open(url, 1)


def _synthesize(browser):
    """Attempt to synthesize a controller base on existing controllers.

    This is useful to create a controller when a user specifies a path to
    an entry in the BROWSER environment variable -- we can copy a general
    controller to operate using a specific installation of the desired
    browser in this way.

    If we can't create a controller in this way, or if there is no
    executable for the requested browser, return [None, None].

    """
    if not os.path.exists(browser):
        return [None, None]
    name = os.path.basename(browser)
    try:
        command = _browsers[name.lower()]
    except KeyError:
        return [None, None]
    # now attempt to clone to fit the new name:
    controller = command[1]
    if controller and name.lower() == controller.basename:
        import copy
        controller = copy.copy(controller)
        controller.name = browser
        controller.basename = os.path.basename(browser)
        register(browser, None, controller)
        return [None, controller]
    ret


def _iscommand(cmd):
    """Return true if cmd can be found on the executable search path."""
    path = os.environ.get("PATH")
    if not path:
        return 0
    for d in path.split(os.pathsep):
        exe = os.path.join(d, cmd)
        if os.path.isfile(exe):
            return 1
    return 0


PROCESS_CREATION_DELAY = 4


class GenericBrowser:
    def __init__(self, cmd):
        self.name, self.args = cmd.split(None, 1)
        self.basename = os.path.basename(self.name)

    def open(self, url, new=0, autoraise=1):
        command = "%s %s" % (self.name, self.args)
        os.system(command % url)

    def open_new(self, url):
        self.open(url)


class Netscape:
    "Launcher class for Netscape browsers."
    def __init__(self, name):
        self.name = name
        self.basename = os.path.basename(name)

    def _remote(self, action, autoraise):
        raise_opt = ("-noraise", "-raise")[autoraise]
        cmd = "%s %s -remote '%s' >/dev/null 2>&1" % (self.name,
                                                      raise_opt,
                                                      action)
        rc = os.system(cmd)
        if rc:
            import time
            os.system("%s &" % self.name)
            time.sleep(PROCESS_CREATION_DELAY)
            rc = os.system(cmd)
        return not rc

    def open(self, url, new=0, autoraise=1):
        if new:
            self._remote("openURL(%s, new-window)"%url, autoraise)
        else:
            self._remote("openURL(%s)" % url, autoraise)

    def open_new(self, url):
        self.open(url, 1)


class Konqueror:
    """Controller for the KDE File Manager (kfm, or Konqueror).

    See http://developer.kde.org/documentation/other/kfmclient.html
    for more information on the Konqueror remote-control interface.

    """
    def __init__(self):
        if _iscommand("konqueror"):
            self.name = self.basename = "konqueror"
        else:
            self.name = self.basename = "kfm"

    def _remote(self, action):
        cmd = "kfmclient %s >/dev/null 2>&1" % action
        rc = os.system(cmd)
        if rc:
            import time
            if self.basename == "konqueror":
                os.system(self.name + " --silent &")
            else:
                os.system(self.name + " -d &")
            time.sleep(PROCESS_CREATION_DELAY)
            rc = os.system(cmd)
        return not rc

    def open(self, url, new=1, autoraise=1):
        # XXX Currently I know no way to prevent KFM from
        # opening a new win.
        self._remote("openURL %s" % url)

    open_new = open


class Grail:
    # There should be a way to maintain a connection to Grail, but the
    # Grail remote control protocol doesn't really allow that at this
    # point.  It probably neverwill!
    def _find_grail_rc(self):
        import glob
        import pwd
        import socket
        import tempfile
        tempdir = os.path.join(tempfile.gettempdir(),
                               ".grail-unix")
        user = pwd.getpwuid(_os.getuid())[0]
        filename = os.path.join(tempdir, user + "-*")
        maybes = glob.glob(filename)
        if not maybes:
            return None
        s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
        for fn in maybes:
            # need to PING each one until we find one that's live
            try:
                s.connect(fn)
            except socket.error:
                # no good; attempt to clean it out, but don't fail:
                try:
                    os.unlink(fn)
                except IOError:
                    pass
            else:
                return s

    def _remote(self, action):
        s = self._find_grail_rc()
        if not s:
            return 0
        s.send(action)
        s.close()
        return 1

    def open(self, url, new=0, autoraise=1):
        if new:
            self._remote("LOADNEW " + url)
        else:
            self._remote("LOAD " + url)

    def open_new(self, url):
        self.open(url, 1)


class WindowsDefault:
    def open(self, url, new=0, autoraise=1):
        os.startfile(url)

    def open_new(self, url):
        self.open(url)

#
# Platform support for Unix
#

# This is the right test because all these Unix browsers require either
# a console terminal of an X display to run.  Note that we cannot split
# the TERM and DISPLAY cases, because we might be running Python from inside
# an xterm.
if os.environ.get("TERM") or os.environ.get("DISPLAY"):
    _tryorder = ("mozilla","netscape","kfm","grail","links","lynx","w3m")

    # Easy cases first -- register console browsers if we have them.
    if os.environ.get("TERM"):
        # The Links browser <http://artax.karlin.mff.cuni.cz/~mikulas/links/>
        if _iscommand("links"):
            register("links", None, GenericBrowser("links %s"))
        # The Lynx browser <http://lynx.browser.org/>
        if _iscommand("lynx"):
            register("lynx", None, GenericBrowser("lynx %s"))
        # The w3m browser <http://ei5nazha.yz.yamagata-u.ac.jp/~aito/w3m/eng/>
        if _iscommand("w3m"):
            register("w3m", None, GenericBrowser("w3m %s"))

    # X browsers have more in the way of options
    if os.environ.get("DISPLAY"):
        # First, the Netscape series
        if _iscommand("netscape") or _iscommand("mozilla"):
            if _iscommand("mozilla"):
                register("mozilla", None, Netscape("mozilla"))
            if _iscommand("netscape"):
                register("netscape", None, Netscape("netscape"))

        # Next, Mosaic -- old but still in use.
        if _iscommand("mosaic"):
            register("mosaic", None, GenericBrowser("mosaic %s >/dev/null &"))

        # Konqueror/kfm, the KDE browser.
        if _iscommand("kfm") or _iscommand("konqueror"):
            register("kfm", Konqueror, Konqueror())

        # Grail, the Python browser.
        if _iscommand("grail"):
            register("grail", Grail, None)


class InternetConfig:
    def open(self, url, new=0, autoraise=1):
        ic.launchurl(url)

    def open_new(self, url):
        self.open(url)


#
# Platform support for Windows
#

if sys.platform[:3] == "win":
    _tryorder = ("netscape", "windows-default")
    register("windows-default", WindowsDefault)

#
# Platform support for MacOS
#

try:
    import ic
except ImportError:
    pass
else:
    # internet-config is the only supported controller on MacOS,
    # so don't mess with the default!
    _tryorder = ("internet-config")
    register("internet-config", InternetConfig)

# OK, now that we know what the default preference orders for each
# platform are, allow user to override them with the BROWSER variable.
#
if os.environ.has_key("BROWSER"):
    # It's the user's responsibility to register handlers for any unknown
    # browser referenced by this value, before calling open().
    _tryorder = os.environ["BROWSER"].split(":")

for cmd in _tryorder:
    if not _browsers.has_key(cmd.lower()):
        if _iscommand(cmd.lower()):
            register(cmd.lower(), None, GenericBrowser("%s %%s" % cmd.lower()))

_tryorder = filter(lambda x: _browsers.has_key(x.lower())
                   or x.find("%s") > -1, _tryorder)
# what to do if _tryorder is now empty?