PK!fmmwuy.py# -*- coding: utf-8 -*- # ############################################################################# # Copyright (C) 2018 manatlan manatlan[at]gmail(dot)com # # 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; version 2 only. # # This program 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. # # https://github.com/manatlan/wuy # ############################################################################# __version__ = "0.10.1" from aiohttp import web, WSCloseCode from multidict import CIMultiDict import concurrent import aiohttp import asyncio import json, sys, os import webbrowser import traceback import uuid import inspect import types import base64 import socket import tempfile import subprocess import platform from urllib.parse import urlparse import inspect import re from datetime import datetime, date """ cef troubles, to fix (before 1.0 release): - FIX: set title don't work on *nix (Issue #252) - FIX: chain'able broken (test app3) - EVOL: make contextual menu (dev tools) optional - TEST: freezing with cef """ DEFAULT_PORT = 8080 application = None currents = {} # NEW isLog = None FULLSCREEN = "fullscreen" # const ! PATH = os.path.dirname(os.path.abspath(os.path.realpath(sys.argv[0]))) try: if not getattr( sys, "frozen", False ): # bypass uvloop in frozen app (wait pyinstaller hook) import uvloop asyncio.set_event_loop_policy(uvloop.EventLoopPolicy()) except ImportError: pass # helpers ############################################################# def isFree(ip, port): s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) try: s.bind((ip, int(port))) return True except socket.error as e: return False finally: s.close() def serialize(obj): def toJSDate(d): assert type(d) in [datetime, date] d = datetime(d.year, d.month, d.day, 0, 0, 0, 0) if type(d) == date else d return d.isoformat() + "Z" if isinstance(obj, (datetime, date)): return toJSDate(obj) if isinstance(obj, bytes): return str(obj, "utf8") if hasattr(obj, "__dict__"): return obj.__dict__ else: return str(obj) def unserialize(obj): if type(obj) == str: if re.search("^\d\d\d\d-\d\d-\d\dT\d\d:\d\d:\d\d\.\d+Z$", obj): return datetime.strptime(obj, "%Y-%m-%dT%H:%M:%S.%fZ") elif re.search("^\d\d\d\d-\d\d-\d\dT\d\d:\d\d:\d\dZ$", obj): return datetime.strptime(obj, "%Y-%m-%dT%H:%M:%SZ") elif type(obj) == list: return [unserialize(i) for i in obj] return obj def jDumps(obj): return json.dumps(obj, default=serialize) def jLoads(s): return unserialize( json.loads(s, object_pairs_hook=lambda obj: {k: unserialize(v) for k, v in obj}) ) class JDict: def __init__(self, f: str): self.__f = os.path.join(PATH, f) try: with open(self.__f, "r+") as fid: self.__d = ( json.load( fid, object_pairs_hook=lambda obj: { k: unserialize(v) for k, v in obj }, ) or {} ) except FileNotFoundError as e: self.__d = {} def set(self, k: str, v): self.__d[k] = v self.__save() def get(self, k: str = None): return self.__d.get(k, None) if k else self.__d def __save(self): with open(self.__f, "w+") as fid: json.dump(self.__d, fid, indent=4, sort_keys=True, default=serialize) def path(f): if hasattr(sys, "_MEIPASS"): # when freezed with pyinstaller ;-) return os.path.join(sys._MEIPASS, f) else: return os.path.join(PATH, f) def wlog(*l): if isLog: s = " ".join([str(i) for i in l]) if len(s) > 200: s = s[:200] + "..." print(s) def find_chrome_win(): import winreg # TODO: pip3 install winreg reg_path = r"SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\chrome.exe" for install_type in winreg.HKEY_CURRENT_USER, winreg.HKEY_LOCAL_MACHINE: try: with winreg.OpenKey(install_type, reg_path, 0, winreg.KEY_READ) as reg_key: return winreg.QueryValue(reg_key, None) except WindowsError: pass def find_chrome_mac(): default_dir = "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome" if os.path.exists(default_dir): return default_dir class ChromeApp: def __init__(self, url, size=None, chromeArgs=[]): self.__instance = None if sys.platform[:3] == "win": exe = find_chrome_win() elif sys.platform == "darwin": exe = find_chrome_mac() else: for i in ["chromium-browser", "chromium", "google-chrome", "chrome"]: try: exe = webbrowser.get(i).name break except webbrowser.Error: exe = None if exe: args = [exe, "--app=" + url] + chromeArgs if size == FULLSCREEN: args.append("--start-fullscreen") if tempfile.gettempdir(): args.append( "--user-data-dir=%s" % os.path.join(tempfile.gettempdir(), ".wuyapp") ) # self.__instance = subprocess.Popen( args, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL ) # make troubles on windows (freezd with noconsole don't start) self.__instance = subprocess.Popen(args) else: raise Exception("no browser") def wait(self): if self.__instance: return self.__instance.wait() def __del__(self): if self.__instance: self.__instance.kill() ############################################################### ## works with CefPython3 ############################################################### class ChromeAppCef: def __init__(self, url, size=None, chromeArgs=None): # chromeArgs is not used import pkgutil assert pkgutil.find_loader("cefpython3"), "cefpython3 not available" def cefbrowser(): from cefpython3 import cefpython as cef import ctypes isWin = platform.system() == "Windows" windowInfo = cef.WindowInfo() windowInfo.windowName = "CefPython3" if type(size) == tuple: w, h = size[0], size[1] windowInfo.SetAsChild(0, [0, 0, w, h]) # not win else: w, h = None, None sys.excepthook = cef.ExceptHook settings = { "product_version": "Wuy/%s" % __version__, "user_agent": "Wuy/%s (%s)" % (__version__, platform.system()), "context_menu": dict( enabled=True, navigation=False, print=False, view_source=False, external_browser=False, devtools=True, ), } cef.Initialize(settings, {}) b = cef.CreateBrowserSync(windowInfo, url=url) if isWin and w and h: window_handle = b.GetOuterWindowHandle() SWP_NOMOVE = 0x0002 # X,Y ignored with SWP_NOMOVE flag ctypes.windll.user32.SetWindowPos( window_handle, 0, 0, 0, w, h, SWP_NOMOVE ) # ===--- def wuyInit(width, height): if size == FULLSCREEN: if isWin: b.ToggleFullscreen() # win only else: b.SetBounds(0, 0, width, height) # not win bindings = cef.JavascriptBindings() bindings.SetFunction("wuyInit", wuyInit) b.SetJavascriptBindings(bindings) b.ExecuteJavascript("wuyInit(window.screen.width,window.screen.height)") # ===--- class WuyClientHandler(object): def OnLoadEnd(self, browser, **_): pass # could serve in the future (?) class WuyDisplayHandler(object): def OnTitleChange(self, browser, title): try: cef.WindowUtils.SetTitle(browser, title) except AttributeError: print( "**WARNING** : title changed '%s' not work on linux" % title ) b.SetClientHandler(WuyClientHandler()) b.SetClientHandler(WuyDisplayHandler()) cef.MessageLoop() cef.Shutdown() from threading import Thread t = Thread(target=cefbrowser) t.start() ############################################################### # -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= jar = aiohttp.CookieJar(unsafe=True) class Request: # just to transform aiohttp.Request in wuy.Request (abstraction) def __init__(self, req): self.method = req.method self.path = req.path self.headers = req.headers self.query = req.rel_url.query self.body = None class Response: def __init__(self, status, content, headers=None): self.status = status if headers is None: self.headers = CIMultiDict() if content is not None and type(content) == bytes: self.headers["Content-Type"] = "application/octet-stream" else: self.headers["Content-Type"] = "text/html" else: if type(headers) == str: self.headers = CIMultiDict([("Content-Type", headers)]) else: self.headers = headers self.content = content async def request( url, data=None, headers={} ): # mimic urllib.Request() (GET & POST only) async with aiohttp.ClientSession(cookie_jar=jar) as session: try: if data: async with session.post( url, data=data, headers=headers, ssl=False ) as resp: return Response( resp.status, await resp.text(), headers=resp.headers ) else: async with session.get(url, headers=headers, ssl=False) as resp: return Response( resp.status, await resp.text(), headers=resp.headers ) except aiohttp.client_exceptions.ClientConnectorError as e: return Response(None, str(e)) # -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= # Async aiohttp things (use current) ############################################################# async def wsSend(ws, **kargs): if not ws.closed: wlog("< send:", kargs) await ws.send_str(jDumps(kargs)) # TODO: should remove ws from list ? async def wsBroadcast(instance, event, args, exceptMe=None): for ws in instance._clients: if id(ws) != id(exceptMe): await wsSend(ws, event=event, args=args) async def handleProxy(req): # proxify "/_/" with headers starting with "set-" url = req.match_info.get("url", None) if req.query_string: url = url + "?" + req.query_string headers = {k[4:]: v for k, v in req.headers.items() if k.lower().startswith("set-")} r = await request( url, data=req.can_read_body and (await req.text()), headers=headers ) wlog(". serve proxy url", url, headers, ":", r.status) h = {"Server": "Wuy Proxified request (%s)" % __version__} for k, v in r.headers.items(): if k.lower() in ["content-type", "date", "expires", "cache-control"]: h[k] = v return web.Response(status=r.status or 0, text=r.content, headers=h) getname = lambda x: x.rsplit(".", 1)[0].replace("/", ".") async def handleWeb(req): # serve all statics from web folder ressource = req.match_info.get("path", "") if ressource == "" or ressource.endswith("/"): ressource += "index.html" if ressource.lower().endswith((".html", ".htm")): name = getname(ressource) if name in currents: html = currents[name]._render(path(os.path.dirname(ressource))) if html: # the instance render its own html, go with it if re.findall(r"""<.*script.*src.*=.*['"]wuy.js['"].*>""", html): return web.Response(status=200, body=html, content_type="text/html") else: return web.Response( status=200, body='\n' + html, content_type="text/html", ) # classic serve static file or 404 file = path(os.path.join("web", ressource)) if os.path.isfile(file): wlog("- serve static file", file) return web.FileResponse(file) else: wreq = Request(req) if req.body_exists: # override body wreq.body = await req.read() for name, instance in currents.items(): ret = instance.request(wreq) if ret is not None: r = await ret if asyncio.iscoroutine(ret) else ret if r is not None: if type(r) != Response: r = Response(status=200, content=r) wlog("- serve dynamic via", name, r) return web.Response( status=r.status, body=r.content, headers=r.headers ) wlog("! 404 on", file) return web.Response(status=404, body="file not found") async def handleJs(req): # serve the JS pp = urlparse(req.headers["Referer"]).path[ 1: ] # TODO: what if browser hide its referer ???? if pp.endswith("/") or pp == "": pp += "index.html" page = getname(pp) instance = currents[page] wlog( "- serve wuy.js to", page, instance._size and ("(with resize to " + str(instance._size) + ")") or "", ) name = os.path.basename(sys.argv[0]) if "." in name: name = name.split(".")[0] js = """ document.addEventListener("DOMContentLoaded", function(event) { %s %s },true) const dateFormat = /^\d\d\d\d-\d\d-\d\dT\d\d:\d\d:\d\d(\.\d+)?Z$/; function reviver(key, value) { if (typeof value === "string" && dateFormat.test(value)) { return new Date(value); } return value; } function setupWS( cbCnx ) { var url=window.location.origin.replace("http","ws")+"/_ws_%s" var ws=new WebSocket( url ); ws.onmessage = function(evt) { var r = JSON.parse(evt.data, reviver ); if(r.uuid) // that's a response from call py ! document.dispatchEvent( new CustomEvent('wuy-'+r.uuid,{ detail: r} ) ); else if(r.event){ // that's an event from anywhere ! document.dispatchEvent( new CustomEvent(r.event,{ detail: r.args } ) ); } }; ws.onclose = function(evt) { console.log("disconnected"); cbCnx(null); %s }; ws.onerror = function(evt) {cbCnx(null);}; ws.onopen=function(evt) { console.log("Connected",evt) cbCnx(ws); } return ws; } var wuy={ _ws: setupWS( function(ws){wuy._ws = ws; document.dispatchEvent( new CustomEvent("init") )} ), on: function( evt, callback ) { // to register an event on a callback document.addEventListener(evt,function(e) { callback.apply(callback,e.detail) }) }, emit: function( evt, data) { // to emit a event to all clients (except me), return a promise when done var args=Array.prototype.slice.call(arguments) return wuy._call("emit", args) }, init: function( callback ) { function start() { document.removeEventListener("init", start) callback() } if(wuy._ws.readyState == wuy._ws.OPEN) start() else document.addEventListener("init", start) }, _call: function( method, args ) { var cmd={ command: method, args: args, uuid: method+"-"+Math.random().toString(36).substring(2), // stamp the exchange, so the callback can be called back (thru customevent), }; if(wuy._ws) { wuy._ws.send( JSON.stringify(cmd) ); return new Promise( function (resolve, reject) { document.addEventListener('wuy-'+cmd.uuid, function handler(x) { this.removeEventListener('wuy-'+cmd.uuid, handler); var x=x.detail; if(x && x.result!==undefined) resolve(x.result) else if(x && x.error!==undefined) reject(x.error) }); }) } else return new Promise( function (resolve, reject) { reject("not connected"); }) }, fetch: function(url,obj) { var h={"cache-control": "no-cache"}; // !!! if(obj && obj.headers) Object.keys(obj.headers).forEach( function(k) { h["set-"+k]=obj.headers[k]; }) var newObj = Object.assign({}, obj) newObj.headers=h; newObj.credentials= 'same-origin'; return fetch( "/_/"+url,newObj ) }, }; """ % ( instance._size and "window.resizeTo(%s,%s);" % (instance._size[0], instance._size[1]) or "", 'if(!document.title) document.title="%s";' % name, page, instance._closeIfSocketClose and "window.close()" or "setTimeout( function() {setupWS(cbCnx)}, 1000);", ) if instance._kwargs: for k, v in instance._kwargs.items(): j64 = str( base64.b64encode(bytes(jDumps(v), "utf8")), "utf8" ) # thru b64 to avoid trouble with quotes or strangers chars js += """\nwuy.%s=JSON.parse(atob("%s"),reviver);""" % (k, j64) for k in instance._routes.keys(): js += ( """\nwuy.%s=function(_) {return wuy._call("%s", Array.prototype.slice.call(arguments) )};""" % (k, k) ) return web.Response(status=200, text=js) async def wshandle(req): global currents page = req.match_info["page"] if page not in currents: return None instance = currents[page] ws = web.WebSocketResponse() await ws.prepare(req) instance._clients.append(ws) wlog("Socket connected", page) try: async for msg in ws: if msg.type == web.WSMsgType.text: try: o = jLoads(msg.data) wlog("> RECEPT", page, o) if o["command"] == "emit": event, *args = o["args"] await wsBroadcast( instance, event, args, ws ) # emit to everybody except me r = dict( result=args ) # but return the same content sended, thru the promise else: ret = instance._routes[o["command"]](*o["args"]) if ret and asyncio.iscoroutine(ret): wlog(". ASync call", page, o["command"]) async def waitReturn(coroutine, uuid): try: ret = await coroutine m = dict(result=ret, uuid=uuid) except concurrent.futures._base.CancelledError as e: m = dict(error="task cancelled", uuid=uuid) except Exception as e: m = dict(error=str(e), uuid=uuid) print("=" * 40, "in ASync", o["command"]) print(traceback.format_exc().strip()) print("=" * 40) await wsSend(ws, **m) asyncio.ensure_future(waitReturn(ret, o["uuid"])) continue # don't answer yet (the coroutine will do it) r = dict(result=ret) except Exception as e: r = dict(error=str(e)) print("=" * 40, "Exception on Recept", msg.data) print(traceback.format_exc().strip()) print("=" * 79) if "uuid" in o: r["uuid"] = o["uuid"] await wsSend(ws, **r) elif msg.type == web.WSMsgType.close or msg.tp == web.WSMsgType.error: break finally: wlog("Socket disconnected", page) instance._clients.remove(ws) if instance._closeIfSocketClose: _exit(instance) return ws def _emit(instance, event, *args): # sync version of emit for py side ! asyncio.ensure_future(wsBroadcast(instance, event, args)) def _exit(instance=None): # exit method global application if asyncio.get_event_loop().is_running(): asyncio.get_event_loop().stop() if instance and hasattr(instance, "_browser") and instance._browser: del instance._browser instance._browser = None application = None wlog("exit") async def on_shutdown(app): async def handle_exception(task): try: await task.cancel() except Exception: pass for task in asyncio.all_tasks(): asyncio.ensure_future(handle_exception(task)) # WUY routines ############################################################# class Base: _routes = {} _closeIfSocketClose = False _size = None _kwargs = {} # Window/Server only def __init__(self, log=True): global isLog isLog = log self._name = self.__class__.__name__ self._routes = { n: v for n, v in inspect.getmembers(self, inspect.ismethod) if not v.__func__.__qualname__.startswith(("Base.", "Window.", "Server.")) } self._routes.update( dict(set=self.set, get=self.get) ) # add get/set config methods if "init" in self._routes: del self._routes[ "init" ] # ensure that a server-side init() is not exposed on client-side self._clients = [] def _render( self, folder="." ): # override this, if you want to do more complex things html = self.__doc__ if html is None: # create startpage if not present and no docstring startpage = path( os.path.join(folder, "web", self.__class__.__name__ + ".html") ) if not os.path.isfile(startpage): if not os.path.isdir(os.path.dirname(startpage)): os.makedirs(os.path.dirname(startpage)) with open(startpage, "w+") as fid: fid.write("""\n""") fid.write("""Hello Wuy'rld ;-)""") print("Create '%s', just edit it" % startpage) return html @classmethod def _start(cls, host, port, instances, appmode): global application, currents for i in instances: i.init() currents = {i._name: i for i in instances} wlog( "Will accept : %s" % ["%s: %s" % (k, list(v._routes.keys())) for k, v in currents.items()] ) # TODO: not neat if application is None: routes = [ web.get("/_ws_{page}", wshandle), web.get("/{path:.*}wuy.js", handleJs), web.get("/", handleWeb), web.route("*", "/_/{url:.+}", handleProxy), web.route("*", "/{path:.+}", handleWeb), ] application = web.Application() try: application.add_routes(routes) except AttributeError: application.router.add_routes(routes) # Py3.5 + aiohttp3.0b application.on_shutdown.append(on_shutdown) try: if ( appmode ): # app-mode, don't shout "server started, Running on, ctrl-c" web.run_app( application, host=host, port=port, print=lambda *a, **k: None ) else: web.run_app(application, host=host, port=port) except concurrent.futures._base.CancelledError: pass # die silently except RuntimeError: # for tests stopping loop TODO check _exit() except KeyboardInterrupt: _exit() asyncio.set_event_loop( asyncio.new_event_loop() ) # renew, so multiple start are availables def emit(self, *a, **k): # emit available for all _emit(self, *a, **k) def init(self): # override this to make initializations pass def request(self, req): # override to hook others web http requests pass def exit(self): # available for ALL !!! _exit() def set(self, key, value, file="config.json"): c = JDict(file) c.set(key, value) def get(self, key=None, file="config.json"): c = JDict(file) return c.get(key) class Window(Base): size = True # or a tuple (wx,wy) _port = None chromeArgs = [] def __init__(self, port=DEFAULT_PORT, log=True, **kwargs): super().__init__(log) self.__dict__.update(kwargs) self._kwargs = kwargs self._run(port=port) def _run(self, port): # start method (app can be True, (width,height), ...) app = self.size self._closeIfSocketClose = True host = "localhost" if Window._port is None: while not isFree(host, port): port += 1 Window._port = port else: port = Window._port url = "http://%s:%s/%s?%s" % ( host, port, self._name + ".html", uuid.uuid4().hex, ) if type(app) == tuple and len(app) == 2: # it's a size tuple : set it ! self._size = app try: # self._browser=ChromeAppCef(url,app) # with CefPython3 !!! self._browser = ChromeApp(url, app, chromeArgs=self.chromeArgs) except Exception as e: print("Can't find Chrome on your desktop : %s" % e) sys.exit(-1) Base._start(host, port, [self], True) class Server(Base): def __init__(self, port=DEFAULT_PORT, log=True, autorun=True, **kwargs): super().__init__(log) self.__dict__.update(kwargs) self._kwargs = kwargs if autorun: Base._start("0.0.0.0", port, [self], False) @classmethod def run(cls, port=DEFAULT_PORT, log=True, **kwargs): global isLog isLog = log allClasses = globals()[cls.__name__].__subclasses__() instances = [c(autorun=False, **kwargs) for c in allClasses] cls._start("0.0.0.0", port, instances, False) if __name__ == "__main__": pass PK!FNFFwuy-0.10.1.dist-info/LICENSE GNU GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. 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Thus, it is not the intent of this section to claim rights or contest your rights to work written entirely by you; rather, the intent is to exercise the right to control the distribution of derivative or collective works based on the Program. In addition, mere aggregation of another work not based on the Program with the Program (or with a work based on the Program) on a volume of a storage or distribution medium does not bring the other work under the scope of this License. 3. You may copy and distribute the Program (or a work based on it, under Section 2) in object code or executable form under the terms of Sections 1 and 2 above provided that you also do one of the following: a) Accompany it with the complete corresponding machine-readable source code, which must be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, b) Accompany it with a written offer, valid for at least three years, to give any third party, for a charge no more than your cost of physically performing source distribution, a complete machine-readable copy of the corresponding source code, to be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, c) Accompany it with the information you received as to the offer to distribute corresponding source code. (This alternative is allowed only for noncommercial distribution and only if you received the program in object code or executable form with such an offer, in accord with Subsection b above.) The source code for a work means the preferred form of the work for making modifications to it. For an executable work, complete source code means all the source code for all modules it contains, plus any associated interface definition files, plus the scripts used to control compilation and installation of the executable. However, as a special exception, the source code distributed need not include anything that is normally distributed (in either source or binary form) with the major components (compiler, kernel, and so on) of the operating system on which the executable runs, unless that component itself accompanies the executable. If distribution of executable or object code is made by offering access to copy from a designated place, then offering equivalent access to copy the source code from the same place counts as distribution of the source code, even though third parties are not compelled to copy the source along with the object code. 4. You may not copy, modify, sublicense, or distribute the Program except as expressly provided under this License. Any attempt otherwise to copy, modify, sublicense or distribute the Program is void, and will automatically terminate your rights under this License. However, parties who have received copies, or rights, from you under this License will not have their licenses terminated so long as such parties remain in full compliance. 5. You are not required to accept this License, since you have not signed it. However, nothing else grants you permission to modify or distribute the Program or its derivative works. These actions are prohibited by law if you do not accept this License. Therefore, by modifying or distributing the Program (or any work based on the Program), you indicate your acceptance of this License to do so, and all its terms and conditions for copying, distributing or modifying the Program or works based on it. 6. Each time you redistribute the Program (or any work based on the Program), the recipient automatically receives a license from the original licensor to copy, distribute or modify the Program subject to these terms and conditions. You may not impose any further restrictions on the recipients' exercise of the rights granted herein. You are not responsible for enforcing compliance by third parties to this License. 7. If, as a consequence of a court judgment or allegation of patent infringement or for any other reason (not limited to patent issues), conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot distribute so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not distribute the Program at all. For example, if a patent license would not permit royalty-free redistribution of the Program by all those who receive copies directly or indirectly through you, then the only way you could satisfy both it and this License would be to refrain entirely from distribution of the Program. If any portion of this section is held invalid or unenforceable under any particular circumstance, the balance of the section is intended to apply and the section as a whole is intended to apply in other circumstances. It is not the purpose of this section to induce you to infringe any patents or other property right claims or to contest validity of any such claims; this section has the sole purpose of protecting the integrity of the free software distribution system, which is implemented by public license practices. Many people have made generous contributions to the wide range of software distributed through that system in reliance on consistent application of that system; it is up to the author/donor to decide if he or she is willing to distribute software through any other system and a licensee cannot impose that choice. This section is intended to make thoroughly clear what is believed to be a consequence of the rest of this License. 8. If the distribution and/or use of the Program is restricted in certain countries either by patents or by copyrighted interfaces, the original copyright holder who places the Program under this License may add an explicit geographical distribution limitation excluding those countries, so that distribution is permitted only in or among countries not thus excluded. In such case, this License incorporates the limitation as if written in the body of this License. 9. The Free Software Foundation may publish revised and/or new versions of the General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. Each version is given a distinguishing version number. If the Program specifies a version number of this License which applies to it and "any later version", you have the option of following the terms and conditions either of that version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of this License, you may choose any version ever published by the Free Software Foundation. 10. If you wish to incorporate parts of the Program into other free programs whose distribution conditions are different, write to the author to ask for permission. For software which is copyrighted by the Free Software Foundation, write to the Free Software Foundation; we sometimes make exceptions for this. Our decision will be guided by the two goals of preserving the free status of all derivatives of our free software and of promoting the sharing and reuse of software generally. NO WARRANTY 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. END OF TERMS AND CONDITIONS How to Apply These Terms to Your New Programs If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms. To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. Copyright (C) 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. This program 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 this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Also add information on how to contact you by electronic and paper mail. If the program is interactive, make it output a short notice like this when it starts in an interactive mode: Gnomovision version 69, Copyright (C) year name of author Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, the commands you use may be called something other than `show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your program. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' (which makes passes at compilers) written by James Hacker. , 1 April 1989 Ty Coon, President of Vice This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. 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