JezK
Edit File: webbrowser.py
#! /usr/bin/python3.6 """Interfaces for launching and remotely controlling Web browsers.""" # Maintained by Georg Brandl. import os import shlex import shutil import sys import subprocess __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, split it into name and args browser = shlex.split(browser) if browser[-1] == '&': return BackgroundBrowser(browser[:-1]) else: 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=True): 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 shutil.which(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] # General parent classes class BaseBrowser(object): """Parent class for all browsers. Do not use directly.""" args = ['%s'] def __init__(self, name=""): self.name = name self.basename = name def open(self, url, new=0, autoraise=True): 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, name): if isinstance(name, str): self.name = name self.args = ["%s"] else: # name should be a list with arguments self.name = name[0] self.args = name[1:] self.basename = os.path.basename(self.name) def open(self, url, new=0, autoraise=True): cmdline = [self.name] + [arg.replace("%s", url) for arg in self.args] try: if sys.platform[:3] == 'win': p = subprocess.Popen(cmdline) else: p = subprocess.Popen(cmdline, close_fds=True) return not p.wait() except OSError: return False class BackgroundBrowser(GenericBrowser): """Class for all browsers which are to be started in the background.""" def open(self, url, new=0, autoraise=True): cmdline = [self.name] + [arg.replace("%s", url) for arg in self.args] try: if sys.platform[:3] == 'win': p = subprocess.Popen(cmdline) else: p = subprocess.Popen(cmdline, close_fds=True, start_new_session=True) return (p.poll() is None) except OSError: return False class UnixBrowser(BaseBrowser): """Parent class for all Unix browsers with remote functionality.""" raise_opts = None background = False redirect_stdout = True # In remote_args, %s will be replaced with the requested URL. %action will # be replaced depending on the value of 'new' passed to open. # remote_action is used for new=0 (open). If newwin is not None, it is # used for new=1 (open_new). If newtab is not None, it is used for # new=3 (open_new_tab). After both substitutions are made, any empty # strings in the transformed remote_args list will be removed. remote_args = ['%action', '%s'] remote_action = None remote_action_newwin = None remote_action_newtab = None def _invoke(self, args, remote, autoraise): raise_opt = [] if remote and self.raise_opts: # use autoraise argument only for remote invocation autoraise = int(autoraise) opt = self.raise_opts[autoraise] if opt: raise_opt = [opt] cmdline = [self.name] + raise_opt + args if remote or self.background: inout = subprocess.DEVNULL else: # for TTY browsers, we need stdin/out inout = None p = subprocess.Popen(cmdline, close_fds=True, stdin=inout, stdout=(self.redirect_stdout and inout or None), stderr=inout, start_new_session=True) if remote: # wait at most five seconds. If the subprocess is not finished, the # remote invocation has (hopefully) started a new instance. try: rc = p.wait(5) # if remote call failed, open() will try direct invocation return not rc except subprocess.TimeoutExpired: return True elif self.background: if p.poll() is None: return True else: return False else: return not p.wait() def open(self, url, new=0, autoraise=True): 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) args = [arg.replace("%s", url).replace("%action", action) for arg in self.remote_args] args = [arg for arg in args if arg] success = self._invoke(args, True, autoraise) if not success: # remote invocation failed, try straight way args = [arg.replace("%s", url) for arg in self.args] return self._invoke(args, False, False) else: return True class Mozilla(UnixBrowser): """Launcher class for Mozilla browsers.""" remote_args = ['%action', '%s'] remote_action = "" remote_action_newwin = "-new-window" remote_action_newtab = "-new-tab" background = True class Netscape(UnixBrowser): """Launcher class for Netscape browser.""" raise_opts = ["-noraise", "-raise"] remote_args = ['-remote', 'openURL(%s%action)'] remote_action = "" remote_action_newwin = ",new-window" remote_action_newtab = ",new-tab" background = True class Galeon(UnixBrowser): """Launcher class for Galeon/Epiphany browsers.""" raise_opts = ["-noraise", ""] remote_args = ['%action', '%s'] remote_action = "-n" remote_action_newwin = "-w" background = True class Chrome(UnixBrowser): "Launcher class for Google Chrome browser." remote_args = ['%action', '%s'] remote_action = "" remote_action_newwin = "--new-window" remote_action_newtab = "" background = True Chromium = Chrome class Opera(UnixBrowser): "Launcher class for Opera browser." raise_opts = ["-noraise", ""] remote_args = ['-remote', 'openURL(%s%action)'] remote_action = "" remote_action_newwin = ",new-window" remote_action_newtab = ",new-page" background = True class Elinks(UnixBrowser): "Launcher class for Elinks browsers." remote_args = ['-remote', 'openURL(%s%action)'] remote_action = "" remote_action_newwin = ",new-window" remote_action_newtab = ",new-tab" background = False # elinks doesn't like its stdout to be redirected - # it uses redirected stdout as a signal to do -dump redirect_stdout = False class Konqueror(BaseBrowser): """Controller for the KDE File Manager (kfm, or Konqueror). See the output of ``kfmclient --commands`` for more information on the Konqueror remote-control interface. """ def open(self, url, new=0, autoraise=True): # XXX Currently I know no way to prevent KFM from opening a new win. if new == 2: action = "newTab" else: action = "openURL" devnull = subprocess.DEVNULL try: p = subprocess.Popen(["kfmclient", action, url], close_fds=True, stdin=devnull, stdout=devnull, stderr=devnull) except OSError: # fall through to next variant pass else: p.wait() # kfmclient's return code unfortunately has no meaning as it seems return True try: p = subprocess.Popen(["konqueror", "--silent", url], close_fds=True, stdin=devnull, stdout=devnull, stderr=devnull, start_new_session=True) except OSError: # fall through to next variant pass else: if p.poll() is None: # Should be running now. return True try: p = subprocess.Popen(["kfm", "-d", url], close_fds=True, stdin=devnull, stdout=devnull, stderr=devnull, start_new_session=True) except OSError: return False else: return (p.poll() is None) 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 never will! 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 OSError: # no good; attempt to clean it out, but don't fail: try: os.unlink(fn) except OSError: 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=True): 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(): # use xdg-open if around if shutil.which("xdg-open"): register("xdg-open", None, BackgroundBrowser("xdg-open")) # The default GNOME3 browser if "GNOME_DESKTOP_SESSION_ID" in os.environ and shutil.which("gvfs-open"): register("gvfs-open", None, BackgroundBrowser("gvfs-open")) # The default GNOME browser if "GNOME_DESKTOP_SESSION_ID" in os.environ and shutil.which("gnome-open"): register("gnome-open", None, BackgroundBrowser("gnome-open")) # The default KDE browser if "KDE_FULL_SESSION" in os.environ and shutil.which("kfmclient"): register("kfmclient", Konqueror, Konqueror("kfmclient")) if shutil.which("x-www-browser"): register("x-www-browser", None, BackgroundBrowser("x-www-browser")) # The Mozilla browsers for browser in ("firefox", "iceweasel", "iceape", "seamonkey"): if shutil.which(browser): register(browser, None, Mozilla(browser)) # The Netscape and old Mozilla browsers for browser in ("mozilla-firefox", "mozilla-firebird", "firebird", "mozilla", "netscape"): if shutil.which(browser): register(browser, None, Netscape(browser)) # Konqueror/kfm, the KDE browser. if shutil.which("kfm"): register("kfm", Konqueror, Konqueror("kfm")) elif shutil.which("konqueror"): register("konqueror", Konqueror, Konqueror("konqueror")) # Gnome's Galeon and Epiphany for browser in ("galeon", "epiphany"): if shutil.which(browser): register(browser, None, Galeon(browser)) # Skipstone, another Gtk/Mozilla based browser if shutil.which("skipstone"): register("skipstone", None, BackgroundBrowser("skipstone")) # Google Chrome/Chromium browsers for browser in ("google-chrome", "chrome", "chromium", "chromium-browser"): if shutil.which(browser): register(browser, None, Chrome(browser)) # Opera, quite popular if shutil.which("opera"): register("opera", None, Opera("opera")) # Next, Mosaic -- old but still in use. if shutil.which("mosaic"): register("mosaic", None, BackgroundBrowser("mosaic")) # Grail, the Python browser. Does anybody still use it? if shutil.which("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"): if shutil.which("www-browser"): register("www-browser", None, GenericBrowser("www-browser")) # The Links/elinks browsers <http://artax.karlin.mff.cuni.cz/~mikulas/links/> if shutil.which("links"): register("links", None, GenericBrowser("links")) if shutil.which("elinks"): register("elinks", None, Elinks("elinks")) # The Lynx browser <http://lynx.isc.org/>, <http://lynx.browser.org/> if shutil.which("lynx"): register("lynx", None, GenericBrowser("lynx")) # The w3m browser <http://w3m.sourceforge.net/> if shutil.which("w3m"): register("w3m", None, GenericBrowser("w3m")) # # Platform support for Windows # if sys.platform[:3] == "win": class WindowsDefault(BaseBrowser): def open(self, url, new=0, autoraise=True): try: os.startfile(url) except OSError: # [Error 22] No application is associated with the specified # file for this operation: '<URL>' return False else: return True _tryorder = [] _browsers = {} # First try to use the default Windows browser register("windows-default", WindowsDefault) # Detect some common Windows browsers, fallback to IE iexplore = os.path.join(os.environ.get("PROGRAMFILES", "C:\\Program Files"), "Internet Explorer\\IEXPLORE.EXE") for browser in ("firefox", "firebird", "seamonkey", "mozilla", "netscape", "opera", iexplore): if shutil.which(browser): register(browser, None, BackgroundBrowser(browser)) # # Platform support for MacOS # 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=True): assert "'" not in url # hack for local urls if not ':' in url: url = 'file:'+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 = 'open location "%s"' % url.replace('"', '%22') # 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 = 'OpenURL "%s"' % url.replace('"', '%22') 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 class MacOSXOSAScript(BaseBrowser): def __init__(self, name): self._name = name def open(self, url, new=0, autoraise=True): if self._name == 'default': script = 'open location "%s"' % url.replace('"', '%22') # opens in default browser else: script = ''' tell application "%s" activate open location "%s" end '''%(self._name, url.replace('"', '%22')) osapipe = os.popen("osascript", "w") if osapipe is None: return False 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("safari", None, MacOSXOSAScript('safari'), -1) register("firefox", None, MacOSXOSAScript('firefox'), -1) register("chrome", None, MacOSXOSAScript('chrome'), -1) register("MacOSX", None, MacOSXOSAScript('default'), -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 != '': cmd = _synthesize(cmdline, -1) if cmd[1] is None: register(cmdline, None, GenericBrowser(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 as msg: print(msg, file=sys.stderr) print(usage, file=sys.stderr) 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(usage, file=sys.stderr) sys.exit(1) url = args[0] open(url, new_win) print("\a") if __name__ == "__main__": main()