| #! /usr/bin/env python |
| """Interfaces for launching and remotely controlling Web browsers.""" |
| |
| import os |
| import sys |
| import stat |
| |
| __all__ = ["Error", "open", "open_new", "open_new_tab", "get", "register"] |
| |
| class Error(Exception): |
| pass |
| |
| _browsers = {} # Dictionary of available browser controllers |
| _tryorder = [] # Preference order of available browsers |
| |
| def register(name, klass, instance=None, update_tryorder=1): |
| """Register a browser connector and, optionally, connection.""" |
| _browsers[name.lower()] = [klass, instance] |
| if update_tryorder > 0: |
| _tryorder.append(name) |
| elif update_tryorder < 0: |
| _tryorder.insert(0, name) |
| |
| def get(using=None): |
| """Return a browser launcher instance appropriate for the environment.""" |
| if using is not None: |
| alternatives = [using] |
| else: |
| alternatives = _tryorder |
| for browser in alternatives: |
| if '%s' in browser: |
| # User gave us a command line, don't mess with it. |
| return GenericBrowser(browser) |
| else: |
| # User gave us a browser name or path. |
| try: |
| command = _browsers[browser.lower()] |
| except KeyError: |
| command = _synthesize(browser) |
| if command[1] is not None: |
| return command[1] |
| elif command[0] is not None: |
| return command[0]() |
| raise Error("could not locate runnable browser") |
| |
| # Please note: the following definition hides a builtin function. |
| # It is recommended one does "import webbrowser" and uses webbrowser.open(url) |
| # instead of "from webbrowser import *". |
| |
| def open(url, new=0, autoraise=1): |
| for name in _tryorder: |
| browser = get(name) |
| if browser.open(url, new, autoraise): |
| return True |
| return False |
| |
| def open_new(url): |
| return open(url, 1) |
| |
| def open_new_tab(url): |
| return open(url, 2) |
| |
| |
| def _synthesize(browser, update_tryorder=1): |
| """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]. |
| |
| """ |
| cmd = browser.split()[0] |
| if not _iscommand(cmd): |
| return [None, None] |
| name = os.path.basename(cmd) |
| 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, update_tryorder) |
| return [None, controller] |
| return [None, None] |
| |
| |
| if sys.platform[:3] == "win": |
| def _isexecutable(cmd): |
| cmd = cmd.lower() |
| if os.path.isfile(cmd) and (cmd.endswith(".exe") or |
| cmd.endswith(".bat")): |
| return True |
| for ext in ".exe", ".bat": |
| if os.path.isfile(cmd + ext): |
| return True |
| return False |
| else: |
| def _isexecutable(cmd): |
| if os.path.isfile(cmd): |
| mode = os.stat(cmd)[stat.ST_MODE] |
| if mode & stat.S_IXUSR or mode & stat.S_IXGRP or mode & stat.S_IXOTH: |
| return True |
| return False |
| |
| def _iscommand(cmd): |
| """Return True if cmd is executable or can be found on the executable |
| search path.""" |
| if _isexecutable(cmd): |
| return True |
| path = os.environ.get("PATH") |
| if not path: |
| return False |
| for d in path.split(os.pathsep): |
| exe = os.path.join(d, cmd) |
| if _isexecutable(exe): |
| return True |
| return False |
| |
| |
| # General parent classes |
| |
| class BaseBrowser(object): |
| """Parent class for all browsers.""" |
| |
| def __init__(self, name=""): |
| self.name = name |
| self.basename = name |
| |
| def open(self, url, new=0, autoraise=1): |
| raise NotImplementedError |
| |
| def open_new(self, url): |
| return self.open(url, 1) |
| |
| def open_new_tab(self, url): |
| return self.open(url, 2) |
| |
| |
| class GenericBrowser(BaseBrowser): |
| """Class for all browsers started with a command |
| and without remote functionality.""" |
| |
| 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): |
| assert "'" not in url |
| command = "%s %s" % (self.name, self.args) |
| rc = os.system(command % url) |
| return not rc |
| |
| |
| class UnixBrowser(BaseBrowser): |
| """Parent class for all Unix browsers with remote functionality.""" |
| |
| raise_opts = None |
| |
| remote_cmd = '' |
| remote_action = None |
| remote_action_newwin = None |
| remote_action_newtab = None |
| remote_background = False |
| |
| def _remote(self, url, action, autoraise): |
| autoraise = int(bool(autoraise)) # always 0/1 |
| raise_opt = self.raise_opts and self.raise_opts[autoraise] or '' |
| cmd = "%s %s %s '%s' >/dev/null 2>&1" % (self.name, raise_opt, |
| self.remote_cmd, action) |
| if self.remote_background: |
| cmd += ' &' |
| rc = os.system(cmd) |
| if rc: |
| # bad return status, try again with simpler command |
| rc = os.system("%s %s" % (self.name, url)) |
| return not rc |
| |
| def open(self, url, new=0, autoraise=1): |
| assert "'" not in url |
| if new == 0: |
| action = self.remote_action |
| elif new == 1: |
| action = self.remote_action_newwin |
| elif new == 2: |
| if self.remote_action_newtab is None: |
| action = self.remote_action_newwin |
| else: |
| action = self.remote_action_newtab |
| else: |
| raise Error("Bad 'new' parameter to open(); expected 0, 1, or 2, got %s" % new) |
| return self._remote(url, action % url, autoraise) |
| |
| |
| class Mozilla(UnixBrowser): |
| """Launcher class for Mozilla/Netscape browsers.""" |
| |
| raise_opts = ("-noraise", "-raise") |
| |
| remote_cmd = '-remote' |
| remote_action = "openURL(%s)" |
| remote_action_newwin = "openURL(%s,new-window)" |
| remote_action_newtab = "openURL(%s,new-tab)" |
| |
| Netscape = Mozilla |
| |
| |
| class Galeon(UnixBrowser): |
| """Launcher class for Galeon/Epiphany browsers.""" |
| |
| raise_opts = ("-noraise", "") |
| remote_action = "-n '%s'" |
| remote_action_newwin = "-w '%s'" |
| |
| remote_background = True |
| |
| |
| class Konqueror(BaseBrowser): |
| """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 _remote(self, url, action): |
| # kfmclient is the new KDE way of opening URLs. |
| cmd = "kfmclient %s >/dev/null 2>&1" % action |
| rc = os.system(cmd) |
| # Fall back to other variants. |
| if rc: |
| if _iscommand("konqueror"): |
| rc = os.system(self.name + " --silent '%s' &" % url) |
| elif _iscommand("kfm"): |
| rc = os.system(self.name + " -d '%s'" % url) |
| return not rc |
| |
| def open(self, url, new=0, autoraise=1): |
| # XXX Currently I know no way to prevent KFM from |
| # opening a new win. |
| assert "'" not in url |
| if new == 2: |
| action = "newTab '%s'" % url |
| else: |
| action = "openURL '%s'" % url |
| ok = self._remote(url, action) |
| return ok |
| |
| |
| class Opera(UnixBrowser): |
| "Launcher class for Opera browser." |
| |
| raise_opts = ("", "-raise") |
| |
| remote_cmd = '-remote' |
| remote_action = "openURL(%s)" |
| remote_action_newwin = "openURL(%s,new-window)" |
| remote_action_newtab = "openURL(%s,new-page)" |
| |
| |
| class Elinks(UnixBrowser): |
| "Launcher class for Elinks browsers." |
| |
| remote_cmd = '-remote' |
| remote_action = "openURL(%s)" |
| remote_action_newwin = "openURL(%s,new-window)" |
| remote_action_newtab = "openURL(%s,new-tab)" |
| |
| def _remote(self, url, action, autoraise): |
| # elinks doesn't like its stdout to be redirected - |
| # it uses redirected stdout as a signal to do -dump |
| cmd = "%s %s '%s' 2>/dev/null" % (self.name, |
| self.remote_cmd, action) |
| rc = os.system(cmd) |
| if rc: |
| rc = os.system("%s %s" % (self.name, url)) |
| return not rc |
| |
| |
| class Grail(BaseBrowser): |
| # 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: |
| ok = self._remote("LOADNEW " + url) |
| else: |
| ok = self._remote("LOAD " + url) |
| return ok |
| |
| |
| # |
| # Platform support for Unix |
| # |
| |
| # These are the right tests because all these Unix browsers require either |
| # a console terminal or an X display to run. |
| |
| def register_X_browsers(): |
| # First, the Mozilla/Netscape browsers |
| for browser in ("mozilla-firefox", "firefox", |
| "mozilla-firebird", "firebird", |
| "mozilla", "netscape"): |
| if _iscommand(browser): |
| register(browser, None, Mozilla(browser)) |
| |
| # The default Gnome browser |
| if _iscommand("gconftool-2"): |
| # get the web browser string from gconftool |
| gc = 'gconftool-2 -g /desktop/gnome/url-handlers/http/command' |
| out = os.popen(gc) |
| commd = out.read().strip() |
| retncode = out.close() |
| |
| # if successful, register it |
| if retncode == None and len(commd) != 0: |
| register("gnome", None, GenericBrowser( |
| commd + " '%s' >/dev/null &")) |
| |
| # Konqueror/kfm, the KDE browser. |
| if _iscommand("kfm"): |
| register("kfm", Konqueror, Konqueror("kfm")) |
| elif _iscommand("konqueror"): |
| register("konqueror", Konqueror, Konqueror("konqueror")) |
| |
| # Gnome's Galeon and Epiphany |
| for browser in ("galeon", "epiphany"): |
| if _iscommand(browser): |
| register(browser, None, Galeon(browser)) |
| |
| # Skipstone, another Gtk/Mozilla based browser |
| if _iscommand("skipstone"): |
| register("skipstone", None, GenericBrowser("skipstone '%s' &")) |
| |
| # Opera, quite popular |
| if _iscommand("opera"): |
| register("opera", None, Opera("opera")) |
| |
| # Next, Mosaic -- old but still in use. |
| if _iscommand("mosaic"): |
| register("mosaic", None, GenericBrowser("mosaic '%s' &")) |
| |
| # Grail, the Python browser. Does anybody still use it? |
| if _iscommand("grail"): |
| register("grail", Grail, None) |
| |
| # Prefer X browsers if present |
| if os.environ.get("DISPLAY"): |
| register_X_browsers() |
| |
| # Also try console browsers |
| if os.environ.get("TERM"): |
| # The Links/elinks browsers <http://artax.karlin.mff.cuni.cz/~mikulas/links/> |
| if _iscommand("links"): |
| register("links", None, GenericBrowser("links '%s'")) |
| if _iscommand("elinks"): |
| register("elinks", None, Elinks("elinks")) |
| # The Lynx browser <http://lynx.isc.org/>, <http://lynx.browser.org/> |
| if _iscommand("lynx"): |
| register("lynx", None, GenericBrowser("lynx '%s'")) |
| # The w3m browser <http://w3m.sourceforge.net/> |
| if _iscommand("w3m"): |
| register("w3m", None, GenericBrowser("w3m '%s'")) |
| |
| # |
| # Platform support for Windows |
| # |
| |
| if sys.platform[:3] == "win": |
| class WindowsDefault(BaseBrowser): |
| def open(self, url, new=0, autoraise=1): |
| os.startfile(url) |
| return True # Oh, my... |
| |
| _tryorder = [] |
| _browsers = {} |
| # Prefer mozilla/netscape/opera if present |
| for browser in ("firefox", "firebird", "mozilla", "netscape", "opera"): |
| if _iscommand(browser): |
| register(browser, None, GenericBrowser(browser + ' %s')) |
| register("windows-default", WindowsDefault) |
| |
| # |
| # Platform support for MacOS |
| # |
| |
| try: |
| import ic |
| except ImportError: |
| pass |
| else: |
| class InternetConfig(BaseBrowser): |
| def open(self, url, new=0, autoraise=1): |
| ic.launchurl(url) |
| return True # Any way to get status? |
| |
| register("internet-config", InternetConfig, update_tryorder=-1) |
| |
| if sys.platform == 'darwin': |
| # Adapted from patch submitted to SourceForge by Steven J. Burr |
| class MacOSX(BaseBrowser): |
| """Launcher class for Aqua browsers on Mac OS X |
| |
| Optionally specify a browser name on instantiation. Note that this |
| will not work for Aqua browsers if the user has moved the application |
| package after installation. |
| |
| If no browser is specified, the default browser, as specified in the |
| Internet System Preferences panel, will be used. |
| """ |
| def __init__(self, name): |
| self.name = name |
| |
| def open(self, url, new=0, autoraise=1): |
| assert "'" not in url |
| # new must be 0 or 1 |
| new = int(bool(new)) |
| if self.name == "default": |
| # User called open, open_new or get without a browser parameter |
| script = _safequote('open location "%s"', url) # opens in default browser |
| else: |
| # User called get and chose a browser |
| if self.name == "OmniWeb": |
| toWindow = "" |
| else: |
| # Include toWindow parameter of OpenURL command for browsers |
| # that support it. 0 == new window; -1 == existing |
| toWindow = "toWindow %d" % (new - 1) |
| cmd = _safequote('OpenURL "%s"', url) |
| script = '''tell application "%s" |
| activate |
| %s %s |
| end tell''' % (self.name, cmd, toWindow) |
| # Open pipe to AppleScript through osascript command |
| osapipe = os.popen("osascript", "w") |
| if osapipe is None: |
| return False |
| # Write script to osascript's stdin |
| osapipe.write(script) |
| rc = osapipe.close() |
| return not rc |
| |
| # Don't clear _tryorder or _browsers since OS X can use above Unix support |
| # (but we prefer using the OS X specific stuff) |
| register("MacOSX", None, MacOSX('default'), -1) |
| |
| |
| # |
| # Platform support for OS/2 |
| # |
| |
| if sys.platform[:3] == "os2" and _iscommand("netscape"): |
| _tryorder = [] |
| _browsers = {} |
| register("os2netscape", None, |
| GenericBrowser("start netscape %s"), -1) |
| |
| |
| # OK, now that we know what the default preference orders for each |
| # platform are, allow user to override them with the BROWSER variable. |
| if "BROWSER" in os.environ: |
| _userchoices = os.environ["BROWSER"].split(os.pathsep) |
| _userchoices.reverse() |
| |
| # Treat choices in same way as if passed into get() but do register |
| # and prepend to _tryorder |
| for cmdline in _userchoices: |
| if cmdline != '': |
| _synthesize(cmdline, -1) |
| cmdline = None # to make del work if _userchoices was empty |
| del cmdline |
| del _userchoices |
| |
| # what to do if _tryorder is now empty? |
| |
| |
| def main(): |
| import getopt |
| usage = """Usage: %s [-n | -t] url |
| -n: open new window |
| -t: open new tab""" % sys.argv[0] |
| try: |
| opts, args = getopt.getopt(sys.argv[1:], 'ntd') |
| except getopt.error, msg: |
| print >>sys.stderr, msg |
| print >>sys.stderr, usage |
| sys.exit(1) |
| new_win = 0 |
| for o, a in opts: |
| if o == '-n': new_win = 1 |
| elif o == '-t': new_win = 2 |
| if len(args) <> 1: |
| print >>sys.stderr, usage |
| sys.exit(1) |
| |
| url = args[0] |
| open(url, new_win) |
| |
| if __name__ == "__main__": |
| main() |