Mercurial > cgi-bin > hgweb.cgi > tincan
annotate tincan.py @ 3:c6902cded64d draft
Corrections and reorg.
| author | David Barts <n5jrn@me.com> |
|---|---|
| date | Mon, 13 May 2019 06:53:08 -0700 |
| parents | ca6f8ca38cf2 |
| children | 0d47859f792a |
| rev | line source |
|---|---|
| 0 | 1 #!/usr/bin/env python3 |
| 2 # -*- coding: utf-8 -*- | |
| 3 # As with Bottle, it's all in one big, ugly file. For now. | |
| 4 | |
| 5 # I m p o r t s | |
| 6 | |
| 7 import os, sys | |
| 8 import ast | |
| 9 import binascii | |
| 10 from base64 import b16encode, b16decode | |
| 2 | 11 import importlib |
| 0 | 12 import io |
| 2 | 13 import py_compile |
| 14 from stat import S_ISDIR, S_ISREG | |
| 0 | 15 |
| 16 import bottle | |
| 17 | |
| 2 | 18 # E x c e p t i o n s |
| 0 | 19 |
| 20 class TinCanException(Exception): | |
| 21 """ | |
| 22 The parent class of all exceptions we raise. | |
| 23 """ | |
| 24 pass | |
| 25 | |
| 26 class TemplateHeaderException(TinCanException): | |
| 27 """ | |
| 28 Raised upon encountering a syntax error in the template headers. | |
| 29 """ | |
| 30 def __init__(self, message, line): | |
| 31 super().__init__(message, line) | |
| 32 self.message = message | |
| 33 self.line = line | |
| 34 | |
| 35 def __str__(self): | |
| 36 return "Line {0}: {1}".format(self.line, self.message) | |
| 37 | |
| 38 class ForwardException(TinCanException): | |
| 39 """ | |
| 40 Raised to effect the flow control needed to do a forward (server-side | |
| 41 redirect). It is ugly to do this, but other Python frameworks do and | |
| 42 there seems to be no good alternative. | |
| 43 """ | |
| 44 def __init__(self, target): | |
| 45 self.target = target | |
| 46 | |
| 47 class TinCanError(TinCanException): | |
| 48 """ | |
| 49 General-purpose exception thrown by TinCan when things go wrong, often | |
| 50 when attempting to launch webapps. | |
| 51 """ | |
| 52 pass | |
| 53 | |
| 2 | 54 # T e m p l a t e s |
| 55 # | |
| 0 | 56 # Template (.pspx) files. These are standard templates for a supported |
| 57 # template engine, but with an optional set of header lines that begin | |
| 58 # with '#'. | |
| 59 | |
| 60 class TemplateFile(object): | |
| 61 """ | |
| 62 Parse a template file into a header part and the body part. The header | |
| 63 is always a leading set of lines, each starting with '#', that is of the | |
| 64 same format regardless of the template body. The template body varies | |
| 65 depending on the selected templating engine. The body part has | |
| 66 each header line replaced by a blank line. This preserves the overall | |
| 67 line numbering when processing the body. The added newlines are normally | |
| 68 stripped out before the rendered page is sent back to the client. | |
| 69 """ | |
| 70 def __init__(self, raw, encoding='utf-8'): | |
| 71 if isinstance(raw, io.TextIOBase): | |
| 72 self._do_init(raw) | |
| 73 elif isinstance(raw, str): | |
| 74 with open(raw, "r", encoding=encoding) as fp: | |
| 75 self._do_init(fp) | |
| 76 else: | |
| 77 raise TypeError("Expecting a string or Text I/O object.") | |
| 78 | |
| 79 def _do_init(self, fp): | |
| 80 self._hbuf = [] | |
| 81 self._bbuf = [] | |
| 82 self._state = self._header | |
| 83 while True: | |
| 84 line = fp.readline() | |
| 85 if line == '': | |
| 86 break | |
| 87 self._state(line) | |
| 88 self.header = ''.join(self._hbuf) | |
| 89 self.body = ''.join(self._bbuf) | |
| 90 | |
| 91 def _header(self, line): | |
| 92 if not line.startswith('#'): | |
| 93 self._state = self._body | |
| 94 self._state(line) | |
| 95 return | |
| 96 self._hbuf.append(line) | |
| 97 self._bbuf.append("\n") | |
| 98 | |
| 99 def _body(self, line): | |
| 100 self._bbuf.append(line) | |
| 101 | |
| 102 class TemplateHeader(object): | |
| 103 """ | |
| 104 Parses and represents a set of header lines. | |
| 105 """ | |
| 2 | 106 _NAMES = [ "errors", "forward", "methods", "python", "template" ] |
| 0 | 107 _FNAMES = [ "hidden" ] |
| 108 | |
| 109 def __init__(self, string): | |
| 110 # Initialize our state | |
| 111 for i in self._NAMES: | |
| 112 setattr(self, i, None) | |
| 113 for i in self._FNAMES: | |
| 114 setattr(self, i, False) | |
| 115 # Parse the string | |
| 116 count = 0 | |
| 117 nameset = set(self._NAMES + self._FNAMES) | |
| 118 seen = set() | |
| 119 lines = string.split("\n") | |
| 120 if lines and lines[-1] == "": | |
| 121 del lines[-1] | |
| 122 for line in lines: | |
| 123 # Get line | |
| 124 count += 1 | |
| 125 if not line.startswith("#"): | |
| 126 raise TemplateHeaderException("Does not start with '#'.", count) | |
| 127 try: | |
| 128 rna, rpa = line.split(maxsplit=1) | |
| 129 except ValueError: | |
| 130 raise TemplateHeaderException("Missing parameter.", count) | |
| 131 # Get name, ignoring remarks. | |
| 132 name = rna[1:] | |
| 133 if name == "rem": | |
| 134 continue | |
| 135 if name not in nameset: | |
| 136 raise TemplateHeaderException("Invalid directive: {0!r}".format(rna), count) | |
| 137 if name in seen: | |
| 138 raise TemplateHeaderException("Duplicate {0!r} directive.".format(rna), count) | |
| 139 seen.add(name) | |
| 140 # Flags | |
| 141 if name in self._FLAGS: | |
| 142 setattr(self, name, True) | |
| 143 continue | |
| 144 # Get parameter | |
| 145 param = rpa.strip() | |
| 146 for i in [ "'", '"']: | |
| 147 if param.startswith(i) and param.endswith(i): | |
| 148 param = ast.literal_eval(param) | |
| 149 break | |
| 150 # Update this object | |
| 151 setattr(self, name, param) | |
| 152 | |
| 2 | 153 # C h a m e l e o n |
| 154 # | |
| 0 | 155 # Support for Chameleon templates (the kind TinCan uses by default). |
| 156 | |
| 157 class ChameleonTemplate(bottle.BaseTemplate): | |
| 158 def prepare(self, **options): | |
| 159 from chameleon import PageTemplate, PageTemplateFile | |
| 160 if self.source: | |
| 161 self.tpl = chameleon.PageTemplate(self.source, | |
| 162 encoding=self.encoding, **options) | |
| 163 else: | |
| 164 self.tpl = chameleon.PageTemplateFile(self.filename, | |
| 165 encoding=self.encoding, search_path=self.lookup, **options) | |
| 166 | |
| 167 def render(self, *args, **kwargs): | |
| 168 for dictarg in args: | |
| 169 kwargs.update(dictarg) | |
| 170 _defaults = self.defaults.copy() | |
| 171 _defaults.update(kwargs) | |
| 172 return self.tpl.render(**_defaults) | |
| 173 | |
| 174 chameleon_template = functools.partial(template, template_adapter=ChameleonTemplate) | |
| 175 chameleon_view = functools.partial(view, template_adapter=ChameleonTemplate) | |
| 176 | |
| 2 | 177 # U t i l i t i e s |
| 0 | 178 |
| 179 def _normpath(base, unsplit): | |
| 180 """ | |
| 181 Split, normalize and ensure a possibly relative path is absolute. First | |
| 182 argument is a list of directory names, defining a base. Second | |
| 183 argument is a string, which may either be relative to that base, or | |
| 184 absolute. Only '/' is supported as a separator. | |
| 185 """ | |
| 186 scratch = unsplit.strip('/').split('/') | |
| 187 if not unsplit.startswith('/'): | |
| 188 scratch = base + scratch | |
| 189 ret = [] | |
| 190 for i in scratch: | |
| 191 if i == '.': | |
| 192 continue | |
| 193 if i == '..': | |
| 194 ret.pop() # may raise IndexError | |
| 195 continue | |
| 196 ret.append(i) | |
| 197 return ret | |
| 198 | |
| 199 def _mangle(string): | |
| 200 """ | |
| 201 Turn a possibly troublesome identifier into a mangled one. | |
| 202 """ | |
| 203 first = True | |
| 204 ret = [] | |
| 205 for ch in string: | |
| 206 if ch == '_' or not (ch if first else "x" + ch).isidentifier(): | |
| 207 ret.append('_') | |
| 208 ret.append(b16encode(ch.encode("utf-8")).decode("us-ascii")) | |
| 209 else: | |
| 210 ret.append(ch) | |
| 211 first = False | |
| 212 return ''.join(ret) | |
| 213 | |
| 214 # The TinCan class. Simply a Bottle webapp that contains a forward method, so | |
| 215 # the code-behind can call request.app.forward(). | |
| 216 | |
| 217 class TinCan(bottle.Bottle): | |
| 218 def forward(self, target): | |
| 219 """ | |
| 220 Forward this request to the specified target route. | |
| 221 """ | |
| 222 source = bottle.request.environ['PATH_INFO'] | |
| 223 base = source.strip('/').split('/')[:-1] | |
| 224 try: | |
| 225 exc = ForwardException('/' + '/'.join(_normpath(base, target))) | |
| 226 except IndexError as e: | |
| 227 raise TinCanError("{0}: invalid forward to {1!r}".format(source, target)) from e | |
| 228 raise exc | |
| 229 | |
| 2 | 230 # C o d e B e h i n d |
| 231 # | |
| 0 | 232 # Represents the code-behind of one of our pages. This gets subclassed, of |
| 233 # course. | |
| 234 | |
| 235 class Page(object): | |
| 236 # Non-private things we refuse to export anyhow. | |
| 237 __HIDDEN = set([ "request", "response" ]) | |
| 238 | |
| 239 def __init__(self, req, resp): | |
| 240 """ | |
| 241 Constructor. This is a lightweight operation. | |
| 242 """ | |
| 243 self.request = req # app context is request.app in Bottle | |
| 244 self.response = resp | |
| 245 | |
| 246 def handle(self): | |
| 247 """ | |
| 248 This is the entry point for the code-behind logic. It is intended | |
| 249 to be overridden. | |
| 250 """ | |
| 251 pass | |
| 252 | |
| 253 def export(self): | |
| 254 """ | |
| 255 Export template variables. The default behavior is to export all | |
| 256 non-hidden non-callables that don't start with an underscore, | |
| 257 plus a an export named page that contains this object itself. | |
| 258 This method can be overridden if a different behavior is | |
| 259 desired. It should always return a dict or dict-like object. | |
| 260 """ | |
| 261 ret = { "page": self } # feature: will be clobbered if self.page exists | |
| 262 for name in dir(self): | |
| 263 if name in self.__HIDDEN or name.startswith('_'): | |
| 264 continue | |
| 265 value = getattr(self, name) | |
| 266 if callable(value): | |
| 267 continue | |
| 268 ret[name] = value | |
| 269 | |
| 2 | 270 # R o u t e s |
| 271 # | |
| 0 | 272 # Represents a route in TinCan. Our launcher creates these on-the-fly based |
| 273 # on the files it finds. | |
| 274 | |
| 2 | 275 _ERRMIN = 400 |
| 276 _ERRMAX = 599 | |
| 277 _PEXTEN = ".py" | |
| 278 _TEXTEN = ".pspx" | |
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279 _FLOOP = "tincan.forwards" |
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280 _FORIG = "tincan.origin" |
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281 |
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282 class TinCanErrorRoute(object): |
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283 """ |
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284 A route to an error page. These never have code-behind, don't get |
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285 routes created for them, and are only reached if an error routes them |
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286 there. Error templates only have two variables available: e (the |
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287 HTTPError object associated with the error) and request. |
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288 """ |
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289 def __init__(self, template): |
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290 self._template = template |
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291 self._template.prepare() |
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292 |
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293 def __call__(self, e): |
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294 return self._template.render(e=e, request=bottle.request).lstrip('\n') |
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295 |
| 0 | 296 class TinCanRoute(object): |
| 297 """ | |
| 298 A route created by the TinCan launcher. | |
| 299 """ | |
| 300 def __init__(self, launcher, name, subdir): | |
| 301 self._fsroot = launcher.fsroot | |
| 302 self._urlroot = launcher.urlroot | |
| 303 self._name = name | |
| 2 | 304 self._python = name + _PEXTEN |
| 0 | 305 self._content = CONTENT |
| 2 | 306 self._fspath = os.path.join(launcher.fsroot, *subdir, name + _TEXTEN) |
| 307 self._urlpath = self._urljoin(launcher.urlroot, *subdir, name + _TEXTEN) | |
| 0 | 308 self._origin = self._urlpath |
| 309 self._subdir = subdir | |
| 310 self._seen = set() | |
| 311 self._tclass = launcher.tclass | |
| 312 self._app = launcher.app | |
| 313 | |
| 2 | 314 def launch(self): |
| 0 | 315 """ |
| 316 Launch a single page. | |
| 317 """ | |
| 318 # Build master and header objects, process #forward directives | |
| 319 hidden = None | |
| 320 while True: | |
| 321 self._template = TemplateFile(self._fspath) | |
| 322 self._header = TemplateHeader(self._template.header) | |
| 323 if hidden is None: | |
| 3 | 324 if self._header.errors is not None: |
| 325 break | |
| 0 | 326 hidden = self._header.hidden |
| 3 | 327 elif self._header.errors is not None: |
| 328 raise TinCanError("{0}: #forward to #errors not allowed".format(self._origin)) | |
| 0 | 329 if self._header.forward is None: |
| 330 break | |
| 331 self._redirect() | |
| 332 # If this is a hidden page, we ignore it for now, since hidden pages | |
| 333 # don't get routes made for them. | |
| 334 if hidden: | |
| 335 return | |
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336 # If this is an error page, register it as such. |
| 2 | 337 if self._header.errors is not None: |
| 3 | 338 self._mkerror() |
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339 return # this implies #hidden |
| 0 | 340 # Get methods for this route |
| 341 if self._header.methods is None: | |
| 342 methods = [ 'GET' ] | |
| 343 else: | |
| 344 methods = [ i.upper() for i in self._header.methods.split() ] | |
| 3 | 345 if not methods: |
| 346 raise TinCanError("{0}: no #methods specified".format(self._urlpath)) | |
| 0 | 347 # Process other header entries |
| 348 if self._header.python is not None: | |
| 2 | 349 if not self._header.python.endswith(_PEXTEN): |
| 350 raise TinCanError("{0}: #python files must end in {1}", self._urlpath, _PEXTEN) | |
| 0 | 351 self._python = self._header.python |
| 352 # Obtain a class object by importing and introspecting a module. | |
| 3 | 353 self._getclass() |
| 354 # Build body object (Chameleon template) | |
| 355 if self._header.template is not None: | |
| 356 if not self._header.template.endswith(_TEXTEN): | |
| 357 raise TinCanError("{0}: #template files must end in {1}", self._urlpath, _TEXTEN) | |
| 358 tpath = os.path.join(self._fsroot, *self._splitpath(self._header.template)) | |
| 359 tfile = TemplateFile(tpath) | |
| 360 self._body = self._tclass(source=tfile.body) | |
| 361 else: | |
| 362 self._body = self._tclass(source=self._template.body) | |
| 363 self._body.prepare() | |
| 364 # Register this thing with Bottle | |
| 365 print("adding route:", self._origin) # debug | |
| 366 self._app.route(self._origin, methods, self) | |
| 367 | |
| 368 def _splitpath(self, unsplit): | |
| 369 return _normpath(self._subdir, unsplit) | |
| 370 | |
| 371 def _mkerror(self): | |
| 372 try: | |
| 373 errors = [ int(i) for i in self._header.errors.split() ] | |
| 374 except ValueError as e: | |
| 375 raise TinCanError("{0}: bad #errors line".format(self._urlpath)) from e | |
| 376 if not errors: | |
| 377 errors = range(_ERRMIN, _ERRMAX+1) | |
| 378 route = TinCanErrorRoute(self._tclass(source=self._template.body)) | |
| 379 for error in errors: | |
| 380 if error < _ERRMIN or error > _ERRMAX: | |
| 381 raise TinCanError("{0}: bad #errors code".format(self._urlpath)) | |
| 382 self._app.error(code=error, callback=route) | |
| 383 | |
| 384 def _getclass(self): | |
| 0 | 385 pypath = os.path.normpath(os.path.join(self._fsroot, *self._subdir, self._python)) |
| 386 pycpath = pypath + 'c' | |
| 387 try: | |
| 388 pyctime = os.stat(pycpath).st_mtime | |
| 389 except OSError: | |
| 390 pyctime = 0 | |
| 391 if pyctime < os.stat(pypath).st_mtime: | |
| 392 try: | |
| 393 py_compile.compile(pypath, cfile=pycpath) | |
| 394 except Exception as e: | |
| 395 raise TinCanError("{0}: error compiling".format(pypath)) from e | |
| 396 try: | |
| 397 spec = importlib.util.spec_from_file_location(_mangle(self._name), cpath) | |
| 398 mod = importlib.util.module_from_spec(spec) | |
| 399 spec.loader.exec_module(mod) | |
| 400 except Exception as e: | |
| 401 raise TinCanError("{0}: error importing".format(pycpath)) from e | |
| 402 self._class = None | |
| 403 for i in dir(mod): | |
| 404 v = getattr(mod, i) | |
| 405 if issubclass(v, Page): | |
| 406 if self._class is not None: | |
| 407 raise TinCanError("{0}: contains multiple Page classes", pypath) | |
| 408 self._class = v | |
| 3 | 409 if self._class is None: |
| 410 raise TinCanError("{0}: contains no Page classes", pypath) | |
| 0 | 411 |
| 412 def _redirect(self): | |
| 413 if self._header.forward in self._seen: | |
| 414 raise TinCanError("{0}: #forward loop".format(self._origin)) | |
| 415 self._seen.add(self._header.forward) | |
| 416 try: | |
| 417 rlist = self._splitpath(self._header.forward) | |
| 418 rname = rlist.pop() | |
| 419 except IndexError as e: | |
| 420 raise TinCanError("{0}: invalid #forward".format(self._urlpath)) from e | |
| 421 name, ext = os.path.splitext(rname)[1] | |
| 2 | 422 if ext != _TEXTEN: |
| 0 | 423 raise TinCanError("{0}: invalid #forward".format(self._urlpath)) |
| 424 self._subdir = rlist | |
| 2 | 425 self._python = name + _PEXTEN |
| 0 | 426 self._fspath = os.path.join(self._fsroot, *self._subdir, rname) |
| 427 self._urlpath = self._urljoin(*self._subdir, rname) | |
| 428 | |
| 429 def _urljoin(self, *args): | |
| 430 args = list(args) | |
| 431 if args[0] == '/': | |
| 432 args[0] = '' | |
| 433 return '/'.join(args) | |
| 434 | |
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435 def __call__(self): |
| 0 | 436 """ |
| 437 This gets called by the framework AFTER the page is launched. | |
| 438 """ | |
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439 target = None |
| 2 | 440 obj = self._class(bottle.request, bottle.response) |
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441 try: |
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442 obj.handle() |
| 2 | 443 return self._body.render(obj.export()).lstrip('\n') |
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444 except ForwardException as fwd: |
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445 target = fwd.target |
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446 if target is None: |
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447 raise TinCanError("Unexpected null target!") |
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448 # We get here if we are doing a server-side programmatic |
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449 # forward. |
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450 environ = bottle.request.environ |
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451 if _FORIG not in environ: |
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452 environ[_FORIG] = self._urlpath |
| 2 | 453 if _FLOOP not in environ: |
| 454 environ[_FLOOP] = set([self._urlpath]) | |
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455 elif target in environ[_FLOOP]: |
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456 TinCanError("{0}: forward loop detected".format(environ[_FORIG])) |
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457 environ[_FLOOP].add(target) |
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458 environ['bottle.raw_path'] = target |
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459 environ['PATH_INFO'] = urllib.parse.quote(target) |
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460 route, args = self._app.router.match(environ) |
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461 environ['route.handle'] = environ['bottle.route'] = route |
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462 environ['route.url_args'] = args |
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463 return route.call(**args) |
| 0 | 464 |
| 465 def _mkdict(self, obj): | |
| 466 ret = {} | |
| 467 for name in dir(obj): | |
| 468 if name.startswith('_'): | |
| 469 continue | |
| 470 value = getattr(obj, name) | |
| 471 if not callable(value): | |
| 472 ret[name] = value | |
| 473 return ret | |
| 2 | 474 |
| 475 # L a u n c h e r | |
| 476 | |
| 477 _WINF = "WEB-INF" | |
| 478 _BANNED = set([_WINF]) | |
| 479 | |
| 480 class _Launcher(object): | |
| 481 """ | |
| 482 Helper class for launching webapps. | |
| 483 """ | |
| 484 def __init__(self, fsroot, urlroot, tclass): | |
| 485 """ | |
| 486 Lightweight constructor. The real action happens in .launch() below. | |
| 487 """ | |
| 488 self.fsroot = fsroot | |
| 489 self.urlroot = urlroot | |
| 490 self.tclass = tclass | |
| 491 self.app = None | |
| 492 | |
| 493 def launch(self): | |
| 494 """ | |
| 495 Does the actual work of launching something. XXX - modifies sys.path | |
| 496 and never un-modifies it. | |
| 497 """ | |
| 498 # Sanity checks | |
| 499 if not self.urlroot.startswith("/"): | |
| 500 raise TinCanError("urlroot must be absolute") | |
| 501 if not os.path.isdir(self.fsroot): | |
| 502 raise TinCanError("no such directory: {0!r}".format(self.fsroot)) | |
| 503 # Make WEB-INF, if needed | |
| 504 winf = os.path.join(self.fsroot, _WINF) | |
| 505 lib = os.path.join(winf, "lib") | |
| 506 for i in [ winf, lib ]: | |
| 507 if not os.path.isdir(i): | |
| 508 os.mkdir(i) | |
| 509 # Add our private lib directory to sys.path | |
| 510 sys.path.insert(1, os.path.abspath(lib)) | |
| 511 # Do what we gotta do | |
| 512 self.app = TinCan() | |
| 513 self._launch([]) | |
| 514 return self.app | |
| 515 | |
| 516 def _launch(self, subdir): | |
| 517 for entry in os.listdir(os.path.join(self.fsroot, *subdir)): | |
| 518 if not subdir and entry in _BANNED: | |
| 519 continue | |
| 520 etype = os.stat(os.path.join(self.fsroot, *subdir, entry)).st_mode | |
| 521 if S_ISREG(etype): | |
| 522 ename, eext = os.path.splitext(entry) | |
| 523 if eext != _TEXTEN: | |
| 524 continue # only look at interesting files | |
| 525 route = TinCanRoute(self, ename, subdir) | |
| 526 page.launch() | |
| 527 elif S_ISDIR(etype): | |
| 528 self._launch(subdir + [entry]) | |
| 529 | |
| 530 def launch(fsroot=None, urlroot='/', tclass=ChameleonTemplate): | |
| 531 """ | |
| 532 Launch and return a TinCan webapp. Does not run the app; it is the | |
| 533 caller's responsibility to call app.run() | |
| 534 """ | |
| 535 if fsroot is None: | |
| 536 fsroot = os.getcwd() | |
| 537 return _Launcher(fsroot, urlroot, tclass).launch() |