Mercurial > pydertron
annotate pydertron.py @ 16:9426f9fa6dc0
Added docs.
| author | Atul Varma <varmaa@toolness.com> |
|---|---|
| date | Thu, 10 Sep 2009 14:55:24 -0700 |
| parents | 16fe9c63aedb |
| children | 9fe3f115f951 |
| rev | line source |
|---|---|
| 16 | 1 """ |
| 2 Pydertron is a high-level wrapper for Pydermonkey that provides convenient, | |
| 3 secure object wrapping between JS and Python space. | |
| 4 """ | |
| 5 | |
| 0 | 6 import sys |
| 7 import threading | |
| 8 import traceback | |
| 9 import weakref | |
| 10 import types | |
|
7
2117265e4dfe
Fixed some threading issues.
Atul Varma <varmaa@toolness.com>
parents:
6
diff
changeset
|
11 import atexit |
| 0 | 12 |
| 13 import pydermonkey | |
| 14 | |
| 15 class ContextWatchdogThread(threading.Thread): | |
| 16 """ | |
| 17 Watches active JS contexts and triggers their operation callbacks | |
| 18 at a regular interval. | |
| 19 """ | |
| 20 | |
| 21 # Default interval, in seconds, that the operation callbacks are | |
| 22 # triggered at. | |
|
8
fb0b161542b1
Improved performance of watchdog thread.
Atul Varma <varmaa@toolness.com>
parents:
7
diff
changeset
|
23 DEFAULT_INTERVAL = 0.25 |
| 0 | 24 |
| 25 def __init__(self, interval=DEFAULT_INTERVAL): | |
| 26 threading.Thread.__init__(self) | |
| 27 self._lock = threading.Lock() | |
| 28 self._stop = threading.Event() | |
| 29 self._contexts = [] | |
| 30 self.interval = interval | |
| 31 | |
| 32 def add_context(self, cx): | |
| 33 self._lock.acquire() | |
| 34 try: | |
| 35 self._contexts.append(weakref.ref(cx)) | |
| 36 finally: | |
| 37 self._lock.release() | |
| 38 | |
| 39 def join(self): | |
| 40 self._stop.set() | |
| 41 threading.Thread.join(self) | |
| 42 | |
| 43 def run(self): | |
| 44 while not self._stop.isSet(): | |
| 45 new_list = [] | |
| 46 self._lock.acquire() | |
| 47 try: | |
| 48 for weakcx in self._contexts: | |
| 49 cx = weakcx() | |
| 50 if cx: | |
| 51 new_list.append(weakcx) | |
| 52 cx.trigger_operation_callback() | |
|
7
2117265e4dfe
Fixed some threading issues.
Atul Varma <varmaa@toolness.com>
parents:
6
diff
changeset
|
53 del cx |
| 0 | 54 self._contexts = new_list |
| 55 finally: | |
| 56 self._lock.release() | |
|
8
fb0b161542b1
Improved performance of watchdog thread.
Atul Varma <varmaa@toolness.com>
parents:
7
diff
changeset
|
57 self._stop.wait(self.interval) |
| 0 | 58 |
| 59 # Create a global watchdog. | |
| 60 watchdog = ContextWatchdogThread() | |
| 61 watchdog.start() | |
|
7
2117265e4dfe
Fixed some threading issues.
Atul Varma <varmaa@toolness.com>
parents:
6
diff
changeset
|
62 atexit.register(watchdog.join) |
| 0 | 63 |
| 64 class InternalError(BaseException): | |
| 65 """ | |
| 66 Represents an error in a JS-wrapped Python function that wasn't | |
| 67 expected to happen; because it's derived from BaseException, it | |
| 68 unrolls the whole JS/Python stack so that the error can be | |
| 69 reported to the outermost calling code. | |
| 70 """ | |
| 71 | |
| 72 def __init__(self): | |
| 73 BaseException.__init__(self) | |
| 74 self.exc_info = sys.exc_info() | |
| 75 | |
| 76 class SafeJsObjectWrapper(object): | |
| 77 """ | |
| 16 | 78 Securely wraps a JS object to behave like any normal Python |
| 79 object. Like JS objects, though, accessing undefined object | |
| 80 results merely in pydermonkey.undefined. | |
| 81 | |
| 82 Object properties may be accessed either via attribute or | |
| 83 item-based lookup. | |
| 0 | 84 """ |
| 85 | |
| 86 __slots__ = ['_jsobject', '_sandbox', '_this'] | |
| 87 | |
| 88 def __init__(self, sandbox, jsobject, this): | |
| 89 if not isinstance(jsobject, pydermonkey.Object): | |
| 90 raise TypeError("Cannot wrap '%s' object" % | |
| 91 type(jsobject).__name__) | |
| 92 object.__setattr__(self, '_sandbox', sandbox) | |
| 93 object.__setattr__(self, '_jsobject', jsobject) | |
| 94 object.__setattr__(self, '_this', this) | |
| 95 | |
| 96 @property | |
| 97 def wrapped_jsobject(self): | |
| 98 return self._jsobject | |
| 99 | |
| 100 def _wrap_to_python(self, jsvalue): | |
| 101 return self._sandbox.wrap_jsobject(jsvalue, self._jsobject) | |
| 102 | |
| 103 def _wrap_to_js(self, value): | |
| 104 return self._sandbox.wrap_pyobject(value) | |
| 105 | |
| 106 def __eq__(self, other): | |
| 107 if isinstance(other, SafeJsObjectWrapper): | |
| 108 return self._jsobject == other._jsobject | |
| 109 else: | |
| 110 return False | |
| 111 | |
| 112 def __str__(self): | |
| 113 return self.toString() | |
| 114 | |
| 115 def __unicode__(self): | |
| 116 return self.toString() | |
| 117 | |
| 118 def __setitem__(self, item, value): | |
| 119 self.__setattr__(item, value) | |
| 120 | |
| 121 def __setattr__(self, name, value): | |
| 122 cx = self._sandbox.cx | |
| 123 jsobject = self._jsobject | |
| 124 | |
| 125 cx.define_property(jsobject, name, | |
| 126 self._wrap_to_js(value)) | |
| 127 | |
| 128 def __getitem__(self, item): | |
| 129 return self.__getattr__(item) | |
| 130 | |
| 131 def __getattr__(self, name): | |
| 132 cx = self._sandbox.cx | |
| 133 jsobject = self._jsobject | |
| 134 | |
| 135 return self._wrap_to_python(cx.get_property(jsobject, name)) | |
| 136 | |
| 137 def __contains__(self, item): | |
| 138 cx = self._sandbox.cx | |
| 139 jsobject = self._jsobject | |
| 140 | |
| 141 return cx.has_property(jsobject, item) | |
| 142 | |
| 143 def __iter__(self): | |
| 144 cx = self._sandbox.cx | |
| 145 jsobject = self._jsobject | |
| 146 | |
| 147 properties = cx.enumerate(jsobject) | |
| 148 for property in properties: | |
| 149 yield property | |
| 150 | |
| 151 class SafeJsFunctionWrapper(SafeJsObjectWrapper): | |
| 152 """ | |
| 153 Securely wraps a JS function to behave like any normal Python object. | |
| 154 """ | |
| 155 | |
| 156 def __init__(self, sandbox, jsfunction, this): | |
| 157 if not isinstance(jsfunction, pydermonkey.Function): | |
| 158 raise TypeError("Cannot wrap '%s' object" % | |
| 159 type(jsobject).__name__) | |
| 160 SafeJsObjectWrapper.__init__(self, sandbox, jsfunction, this) | |
| 161 | |
| 162 def __call__(self, *args): | |
| 163 cx = self._sandbox.cx | |
| 164 jsobject = self._jsobject | |
| 165 this = self._this | |
| 166 | |
| 167 arglist = [] | |
| 168 for arg in args: | |
| 169 arglist.append(self._wrap_to_js(arg)) | |
| 170 | |
| 171 obj = cx.call_function(this, jsobject, tuple(arglist)) | |
| 172 return self._wrap_to_python(obj) | |
| 173 | |
| 11 | 174 def format_stack(js_stack, open=open): |
| 0 | 175 """ |
| 176 Returns a formatted Python-esque stack traceback of the given | |
| 177 JS stack. | |
| 178 """ | |
| 179 | |
| 180 STACK_LINE =" File \"%(filename)s\", line %(lineno)d, in %(name)s" | |
| 181 | |
| 182 lines = [] | |
| 183 while js_stack: | |
| 184 script = js_stack['script'] | |
| 185 function = js_stack['function'] | |
| 186 if script: | |
| 187 frameinfo = dict(filename = script.filename, | |
| 188 lineno = js_stack['lineno'], | |
| 189 name = '<module>') | |
| 190 elif function and not function.is_python: | |
| 191 frameinfo = dict(filename = function.filename, | |
| 192 lineno = js_stack['lineno'], | |
| 193 name = function.name) | |
| 194 else: | |
| 195 frameinfo = None | |
| 196 if frameinfo: | |
| 197 lines.insert(0, STACK_LINE % frameinfo) | |
| 198 try: | |
| 199 filelines = open(frameinfo['filename']).readlines() | |
| 200 line = filelines[frameinfo['lineno'] - 1].strip() | |
| 201 lines.insert(1, " %s" % line) | |
| 202 except Exception: | |
| 203 pass | |
| 204 js_stack = js_stack['caller'] | |
| 205 lines.insert(0, "Traceback (most recent call last):") | |
| 206 return '\n'.join(lines) | |
| 207 | |
| 208 def jsexposed(name=None, on=None): | |
| 209 """ | |
| 210 Decorator used to expose the decorated function or method to | |
| 211 untrusted JS. | |
| 212 | |
| 213 'name' is an optional alternative name for the function. | |
| 214 | |
| 215 'on' is an optional SafeJsObjectWrapper that the function can be | |
| 216 automatically attached as a property to. | |
| 217 """ | |
| 218 | |
| 219 if callable(name): | |
| 220 func = name | |
| 221 func.__jsexposed__ = True | |
| 222 return func | |
| 223 | |
| 224 def make_exposed(func): | |
| 225 if name: | |
| 226 func.__name__ = name | |
| 227 func.__jsexposed__ = True | |
| 228 if on: | |
| 229 on[func.__name__] = func | |
| 230 return func | |
| 231 return make_exposed | |
| 232 | |
| 233 class JsExposedObject(object): | |
| 234 """ | |
| 235 Trivial base/mixin class for any Python classes that choose to | |
| 236 expose themselves to JS code. | |
| 237 """ | |
| 238 | |
| 239 pass | |
| 240 | |
| 241 class JsSandbox(object): | |
| 242 """ | |
| 243 A JS runtime and associated functionality capable of securely | |
| 244 loading and executing scripts. | |
| 245 """ | |
| 246 | |
| 11 | 247 def __init__(self, fs, watchdog=watchdog): |
| 0 | 248 rt = pydermonkey.Runtime() |
| 249 cx = rt.new_context() | |
|
2
b6f9d743a2b5
Refined require() implementation.
Atul Varma <varmaa@toolness.com>
parents:
1
diff
changeset
|
250 root_proto = cx.new_object() |
|
b6f9d743a2b5
Refined require() implementation.
Atul Varma <varmaa@toolness.com>
parents:
1
diff
changeset
|
251 cx.init_standard_classes(root_proto) |
|
b6f9d743a2b5
Refined require() implementation.
Atul Varma <varmaa@toolness.com>
parents:
1
diff
changeset
|
252 root = cx.new_object(None, root_proto) |
| 0 | 253 |
| 254 cx.set_operation_callback(self._opcb) | |
| 255 cx.set_throw_hook(self._throwhook) | |
| 256 watchdog.add_context(cx) | |
| 257 | |
| 11 | 258 self.fs = fs |
| 0 | 259 self.rt = rt |
| 260 self.cx = cx | |
| 261 self.curr_exc = None | |
| 262 self.py_stack = None | |
| 263 self.js_stack = None | |
| 11 | 264 self.__modules = {} |
| 0 | 265 self.__py_to_js = {} |
| 266 self.__type_protos = {} | |
| 11 | 267 self.__globals = {} |
| 268 self.__root_proto = root_proto | |
| 0 | 269 self.root = self.wrap_jsobject(root, root) |
| 270 | |
| 11 | 271 def set_globals(self, **globals): |
| 16 | 272 """ |
| 273 Sets the global properties for the root object and all global | |
| 274 scopes (e.g., SecurableModules). This should be called before | |
| 275 any scripts are executed. | |
| 276 """ | |
| 277 | |
| 11 | 278 self.__globals.update(globals) |
| 279 self._install_globals(self.root) | |
| 280 | |
| 0 | 281 def finish(self): |
| 282 """ | |
| 283 Cleans up all resources used by the sandbox, breaking any reference | |
| 284 cycles created due to issue #2 in pydermonkey: | |
| 285 | |
| 286 http://code.google.com/p/pydermonkey/issues/detail?id=2 | |
| 287 """ | |
| 288 | |
| 289 for jsobj in self.__py_to_js.values(): | |
| 290 self.cx.clear_object_private(jsobj) | |
| 291 del self.__py_to_js | |
| 292 del self.__type_protos | |
| 293 del self.curr_exc | |
| 294 del self.py_stack | |
| 295 del self.js_stack | |
| 296 del self.cx | |
| 297 del self.rt | |
| 298 | |
| 299 def _opcb(self, cx): | |
| 300 # Don't do anything; if a keyboard interrupt was triggered, | |
| 301 # it'll get raised here automatically. | |
| 302 pass | |
| 303 | |
| 304 def _throwhook(self, cx): | |
| 305 curr_exc = cx.get_pending_exception() | |
| 306 if self.curr_exc != curr_exc: | |
| 307 self.curr_exc = curr_exc | |
| 308 self.py_stack = traceback.extract_stack() | |
| 309 self.js_stack = cx.get_stack() | |
| 310 | |
| 311 def __wrap_pycallable(self, func, pyproto=None): | |
| 312 if func in self.__py_to_js: | |
| 313 return self.__py_to_js[func] | |
| 314 | |
| 315 if hasattr(func, '__name__'): | |
| 316 name = func.__name__ | |
| 317 else: | |
| 318 name = "" | |
| 319 | |
| 320 if pyproto: | |
| 321 def wrapper(func_cx, this, args): | |
| 322 try: | |
| 323 arglist = [] | |
| 324 for arg in args: | |
| 325 arglist.append(self.wrap_jsobject(arg)) | |
| 326 instance = func_cx.get_object_private(this) | |
| 327 if instance is None or not isinstance(instance, pyproto): | |
| 328 raise pydermonkey.error("Method type mismatch") | |
| 329 | |
| 330 # TODO: Fill in extra required params with | |
| 331 # pymonkey.undefined? or automatically throw an | |
| 332 # exception to calling js code? | |
| 333 return self.wrap_pyobject(func(instance, *arglist)) | |
| 334 except pydermonkey.error: | |
| 335 raise | |
| 336 except Exception: | |
| 337 raise InternalError() | |
| 338 else: | |
| 339 def wrapper(func_cx, this, args): | |
| 340 try: | |
| 341 arglist = [] | |
| 342 for arg in args: | |
| 343 arglist.append(self.wrap_jsobject(arg)) | |
| 344 | |
| 345 # TODO: Fill in extra required params with | |
| 346 # pymonkey.undefined? or automatically throw an | |
| 347 # exception to calling js code? | |
| 348 return self.wrap_pyobject(func(*arglist)) | |
| 349 except pydermonkey.error: | |
| 350 raise | |
| 351 except Exception: | |
| 352 raise InternalError() | |
| 353 wrapper.wrapped_pyobject = func | |
| 354 wrapper.__name__ = name | |
| 355 | |
| 356 jsfunc = self.cx.new_function(wrapper, name) | |
| 357 self.__py_to_js[func] = jsfunc | |
| 358 | |
| 359 return jsfunc | |
| 360 | |
| 361 def __wrap_pyinstance(self, value): | |
| 362 pyproto = type(value) | |
| 363 if pyproto not in self.__type_protos: | |
| 364 jsproto = self.cx.new_object() | |
| 365 if hasattr(pyproto, '__jsprops__'): | |
| 366 define_getter = self.cx.get_property(jsproto, | |
| 367 '__defineGetter__') | |
| 368 define_setter = self.cx.get_property(jsproto, | |
| 369 '__defineSetter__') | |
| 370 for name in pyproto.__jsprops__: | |
| 371 prop = getattr(pyproto, name) | |
| 372 if not type(prop) == property: | |
| 373 raise TypeError("Expected attribute '%s' to " | |
| 374 "be a property" % name) | |
| 375 getter = None | |
| 376 setter = None | |
| 377 if prop.fget: | |
| 378 getter = self.__wrap_pycallable(prop.fget, | |
| 379 pyproto) | |
| 380 if prop.fset: | |
| 381 setter = self.__wrap_pycallable(prop.fset, | |
| 382 pyproto) | |
| 383 if getter: | |
| 384 self.cx.call_function(jsproto, | |
| 385 define_getter, | |
| 386 (name, getter)) | |
| 387 if setter: | |
| 388 self.cx.call_function(jsproto, | |
| 389 define_setter, | |
| 390 (name, setter,)) | |
| 391 for name in dir(pyproto): | |
| 392 attr = getattr(pyproto, name) | |
| 393 if (isinstance(attr, types.UnboundMethodType) and | |
| 394 hasattr(attr, '__jsexposed__') and | |
| 395 attr.__jsexposed__): | |
| 396 jsmethod = self.__wrap_pycallable(attr, pyproto) | |
| 397 self.cx.define_property(jsproto, name, jsmethod) | |
| 398 self.__type_protos[pyproto] = jsproto | |
| 399 return self.cx.new_object(value, self.__type_protos[pyproto]) | |
| 400 | |
| 401 def wrap_pyobject(self, value): | |
| 402 """ | |
| 403 Wraps the given Python object for export to untrusted JS. | |
| 404 | |
| 405 If the Python object isn't of a type that can be exposed to JS, | |
| 406 a TypeError is raised. | |
| 407 """ | |
| 408 | |
| 409 if (isinstance(value, (int, basestring, float, bool)) or | |
| 410 value is pydermonkey.undefined or | |
| 411 value is None): | |
| 412 return value | |
| 413 if isinstance(value, SafeJsObjectWrapper): | |
| 414 # It's already wrapped, just unwrap it. | |
| 415 return value.wrapped_jsobject | |
| 416 elif callable(value): | |
| 417 if not (hasattr(value, '__jsexposed__') and | |
| 418 value.__jsexposed__): | |
| 419 raise ValueError("Callable isn't configured for exposure " | |
| 420 "to untrusted JS code") | |
| 421 return self.__wrap_pycallable(value) | |
| 422 elif isinstance(value, JsExposedObject): | |
| 423 return self.__wrap_pyinstance(value) | |
| 424 else: | |
| 425 raise TypeError("Can't expose objects of type '%s' to JS." % | |
| 426 type(value).__name__) | |
| 427 | |
| 428 def wrap_jsobject(self, jsvalue, this=None): | |
| 429 """ | |
| 430 Wraps the given pydermonkey.Object for import to trusted | |
| 431 Python code. If the type is just a primitive, it's simply | |
| 432 returned, since no wrapping is needed. | |
| 433 """ | |
| 434 | |
| 435 if this is None: | |
| 436 this = self.root.wrapped_jsobject | |
| 437 if isinstance(jsvalue, pydermonkey.Function): | |
| 438 if jsvalue.is_python: | |
| 439 # It's a Python function, just unwrap it. | |
| 440 return self.cx.get_object_private(jsvalue).wrapped_pyobject | |
| 441 return SafeJsFunctionWrapper(self, jsvalue, this) | |
| 442 elif isinstance(jsvalue, pydermonkey.Object): | |
| 443 # It's a wrapped Python object instance, just unwrap it. | |
| 444 instance = self.cx.get_object_private(jsvalue) | |
| 445 if instance: | |
| 446 if not isinstance(instance, JsExposedObject): | |
| 447 raise AssertionError("Object private is not of type " | |
| 448 "JsExposedObject") | |
| 449 return instance | |
| 450 else: | |
| 451 return SafeJsObjectWrapper(self, jsvalue, this) | |
| 452 else: | |
| 453 # It's a primitive value. | |
| 454 return jsvalue | |
| 455 | |
| 456 def new_array(self, *contents): | |
| 16 | 457 """ |
| 458 Creates a new JavaScript array with the given contents and | |
| 459 returns a wrapper for it. | |
| 460 """ | |
| 461 | |
| 0 | 462 array = self.wrap_jsobject(self.cx.new_array_object()) |
| 463 for item in contents: | |
| 464 array.push(item) | |
| 465 return array | |
| 466 | |
| 467 def new_object(self, **contents): | |
| 16 | 468 """ |
| 469 Creates a new JavaScript object with the given properties and | |
| 470 returns a wrapper for it. | |
| 471 """ | |
| 472 | |
| 0 | 473 obj = self.wrap_jsobject(self.cx.new_object()) |
| 474 for name in contents: | |
| 475 obj[name] = contents[name] | |
| 476 return obj | |
| 477 | |
| 11 | 478 def get_calling_script(self): |
| 16 | 479 """ |
| 480 Returns the filename of the current stack's most recent | |
| 481 JavaScript caller. | |
| 482 """ | |
| 483 | |
| 11 | 484 frame = self.cx.get_stack()['caller'] |
| 485 curr_script = None | |
| 486 while frame and curr_script is None: | |
| 487 if frame['function'] and frame['function'].filename: | |
| 488 curr_script = frame['function'].filename | |
| 489 elif frame['script']: | |
| 490 curr_script = frame['script'].filename | |
| 491 frame = frame['caller'] | |
| 492 | |
| 493 if curr_script is None: | |
| 494 raise RuntimeError("Can't find calling script") | |
| 495 return curr_script | |
| 496 | |
| 497 def _install_globals(self, object): | |
| 498 for name in self.__globals: | |
| 499 object[name] = self.__globals[name] | |
| 500 object['require'] = self._require | |
| 501 | |
| 502 @jsexposed(name='require') | |
| 503 def _require(self, path): | |
| 16 | 504 """ |
| 505 Implementation for the global require() function, implemented | |
| 506 as per the CommonJS SecurableModule specification: | |
| 507 | |
| 508 http://wiki.commonjs.org/wiki/CommonJS/Modules/SecurableModules | |
| 509 """ | |
| 510 | |
| 11 | 511 filename = self.fs.find_module(self.get_calling_script(), path) |
| 512 if not filename: | |
| 513 raise pydermonkey.error('Module not found: %s' % path) | |
| 514 if not filename in self.__modules: | |
| 515 cx = self.cx | |
| 516 module = cx.new_object(None, self.__root_proto) | |
| 517 cx.init_standard_classes(module) | |
| 518 exports = cx.new_object() | |
| 519 cx.define_property(module, 'exports', exports) | |
| 520 self._install_globals(self.wrap_jsobject(module)) | |
| 521 self.__modules[filename] = self.wrap_jsobject(exports) | |
| 522 contents = self.fs.open(filename).read() | |
| 523 cx.evaluate_script(module, contents, filename, 1) | |
| 524 return self.__modules[filename] | |
| 0 | 525 |
|
6
97adec8c8127
Now passing all CommonJS SecurableModule compliance tests.
Atul Varma <varmaa@toolness.com>
parents:
5
diff
changeset
|
526 def run_script(self, contents, filename='<string>', lineno=1, |
| 11 | 527 callback=None, stderr=sys.stderr): |
| 0 | 528 """ |
| 529 Runs the given JS script, returning 0 on success, -1 on failure. | |
| 530 """ | |
| 531 | |
| 532 retval = -1 | |
| 533 cx = self.cx | |
| 534 try: | |
| 535 result = cx.evaluate_script(self.root.wrapped_jsobject, | |
|
6
97adec8c8127
Now passing all CommonJS SecurableModule compliance tests.
Atul Varma <varmaa@toolness.com>
parents:
5
diff
changeset
|
536 contents, filename, lineno) |
| 0 | 537 if callback: |
| 538 callback(self.wrap_jsobject(result)) | |
| 539 retval = 0 | |
| 540 except pydermonkey.error, e: | |
| 11 | 541 params = dict( |
| 542 stack_trace = format_stack(self.js_stack, self.fs.open), | |
| 543 error = e.args[1] | |
| 544 ) | |
| 545 stderr.write("%(stack_trace)s\n%(error)s\n" % params) | |
| 0 | 546 except InternalError, e: |
| 11 | 547 stderr.write("An internal error occurred.\n") |
| 548 traceback.print_tb(e.exc_info[2], None, stderr) | |
| 549 stderr.write("%s\n" % e.exc_info[1]) | |
| 0 | 550 return retval |
|
1
ab09b8a10876
Added trivial half-baked implementation of securable modules.
Atul Varma <varmaa@toolness.com>
parents:
0
diff
changeset
|
551 |
| 14 | 552 class HttpFileSystem(object): |
| 16 | 553 """ |
| 554 File system through which all resources are loaded over HTTP. | |
| 555 """ | |
| 556 | |
| 14 | 557 def __init__(self, base_url): |
| 558 self.base_url = base_url | |
| 559 | |
| 560 def find_module(self, curr_url, path): | |
| 561 import urlparse | |
| 562 | |
| 563 if path.startswith("."): | |
| 564 base_url = curr_url | |
| 565 else: | |
| 566 base_url = self.base_url | |
| 567 | |
| 568 url = "%s.js" % urlparse.urljoin(base_url, path) | |
| 569 if not url.startswith(self.base_url): | |
| 570 return None | |
| 571 return url | |
| 572 | |
| 573 def open(self, url): | |
| 574 import urllib | |
| 575 | |
| 576 return urllib.urlopen(url) | |
| 577 | |
| 16 | 578 class LocalFileSystem(object): |
| 579 """ | |
| 580 File system through which all resources are loaded over the local | |
| 581 filesystem. | |
| 582 """ | |
| 583 | |
| 11 | 584 def __init__(self, root_dir): |
|
3
14d8d73774d7
Refactored securable module loader.
Atul Varma <varmaa@toolness.com>
parents:
2
diff
changeset
|
585 self.root_dir = root_dir |
|
2
b6f9d743a2b5
Refined require() implementation.
Atul Varma <varmaa@toolness.com>
parents:
1
diff
changeset
|
586 |
| 11 | 587 def find_module(self, curr_script, path): |
| 14 | 588 import os |
| 589 | |
| 11 | 590 if path.startswith("."): |
| 591 base_dir = os.path.dirname(curr_script) | |
| 592 else: | |
| 593 base_dir = self.root_dir | |
|
2
b6f9d743a2b5
Refined require() implementation.
Atul Varma <varmaa@toolness.com>
parents:
1
diff
changeset
|
594 |
| 11 | 595 ospath = path.replace('/', os.path.sep) |
| 596 filename = os.path.join(base_dir, "%s.js" % ospath) | |
| 597 filename = os.path.normpath(filename) | |
| 598 if (filename.startswith(self.root_dir) and | |
| 599 (os.path.exists(filename) and | |
| 600 not os.path.isdir(filename))): | |
| 601 return filename | |
| 602 else: | |
| 603 return None | |
|
3
14d8d73774d7
Refactored securable module loader.
Atul Varma <varmaa@toolness.com>
parents:
2
diff
changeset
|
604 |
| 11 | 605 def open(self, filename): |
| 606 return open(filename, 'r') |