Mercurial > cgi-bin > hgweb.cgi > tincan
annotate tincan.py @ 58:e08e24707da1 draft
Recognize index.pspx (and index.html, and index.htm if static).
| author | David Barts <n5jrn@me.com> |
|---|---|
| date | Fri, 31 May 2019 20:42:57 -0700 |
| parents | 935f8013f540 |
| children | 60907204a265 |
| 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 | |
|
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11 from chameleon import PageTemplate, PageTemplateFile, TemplateError |
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12 import email.utils |
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13 import functools |
| 2 | 14 import importlib |
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15 from inspect import isclass |
| 0 | 16 import io |
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17 import logging |
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18 import mimetypes |
| 2 | 19 import py_compile |
| 20 from stat import S_ISDIR, S_ISREG | |
| 5 | 21 from string import whitespace |
| 43 | 22 from threading import Lock |
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23 import time |
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24 import urllib |
| 0 | 25 |
| 26 import bottle | |
| 27 | |
| 2 | 28 # E x c e p t i o n s |
| 0 | 29 |
| 30 class TinCanException(Exception): | |
| 31 """ | |
| 32 The parent class of all exceptions we raise. | |
| 33 """ | |
| 34 pass | |
| 35 | |
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36 class TemplateHeaderError(TinCanException): |
| 0 | 37 """ |
| 38 Raised upon encountering a syntax error in the template headers. | |
| 39 """ | |
| 40 def __init__(self, message, line): | |
| 41 super().__init__(message, line) | |
| 42 self.message = message | |
| 43 self.line = line | |
| 44 | |
| 45 def __str__(self): | |
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46 return "line {0}: {1}".format(self.line, self.message) |
| 0 | 47 |
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48 class LoadError(TinCanException): |
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49 """ |
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50 Raised when we run into problems #load'ing something, usually |
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51 because it doesn't exist. |
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52 """ |
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53 def __init__(self, message, source): |
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54 super().__init__(message, source) |
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55 self.message = message |
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56 self.source = source |
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57 |
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58 def __str__(self): |
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59 return "{0}: #load error: {1}".format(self.source, self.message) |
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60 |
| 0 | 61 class ForwardException(TinCanException): |
| 62 """ | |
| 63 Raised to effect the flow control needed to do a forward (server-side | |
| 64 redirect). It is ugly to do this, but other Python frameworks do and | |
| 65 there seems to be no good alternative. | |
| 66 """ | |
| 67 def __init__(self, target): | |
| 68 self.target = target | |
| 69 | |
| 70 class TinCanError(TinCanException): | |
| 71 """ | |
| 72 General-purpose exception thrown by TinCan when things go wrong, often | |
| 73 when attempting to launch webapps. | |
| 74 """ | |
| 75 pass | |
| 76 | |
| 2 | 77 # T e m p l a t e s |
| 78 # | |
| 0 | 79 # Template (.pspx) files. These are standard templates for a supported |
| 80 # template engine, but with an optional set of header lines that begin | |
| 81 # with '#'. | |
| 82 | |
| 83 class TemplateFile(object): | |
| 84 """ | |
| 85 Parse a template file into a header part and the body part. The header | |
| 86 is always a leading set of lines, each starting with '#', that is of the | |
| 87 same format regardless of the template body. The template body varies | |
| 88 depending on the selected templating engine. The body part has | |
| 89 each header line replaced by a blank line. This preserves the overall | |
| 90 line numbering when processing the body. The added newlines are normally | |
| 91 stripped out before the rendered page is sent back to the client. | |
| 92 """ | |
| 5 | 93 _END = "#end" |
| 94 _LEND = len(_END) | |
| 95 _WS = set(whitespace) | |
| 96 | |
| 0 | 97 def __init__(self, raw, encoding='utf-8'): |
| 98 if isinstance(raw, io.TextIOBase): | |
| 99 self._do_init(raw) | |
| 100 elif isinstance(raw, str): | |
| 101 with open(raw, "r", encoding=encoding) as fp: | |
| 102 self._do_init(fp) | |
| 103 else: | |
| 104 raise TypeError("Expecting a string or Text I/O object.") | |
| 105 | |
| 106 def _do_init(self, fp): | |
| 107 self._hbuf = [] | |
| 108 self._bbuf = [] | |
| 109 self._state = self._header | |
| 110 while True: | |
| 111 line = fp.readline() | |
| 112 if line == '': | |
| 113 break | |
| 114 self._state(line) | |
| 115 self.header = ''.join(self._hbuf) | |
| 116 self.body = ''.join(self._bbuf) | |
| 117 | |
| 118 def _header(self, line): | |
| 119 if not line.startswith('#'): | |
| 120 self._state = self._body | |
| 121 self._state(line) | |
| 122 return | |
| 5 | 123 if line.startswith(self._END) and (len(line) == self._LEND or line[self._LEND] in self._WS): |
| 124 self._state = self._body | |
| 0 | 125 self._hbuf.append(line) |
| 36 | 126 self._bbuf.append("\n") |
| 0 | 127 |
| 128 def _body(self, line): | |
| 129 self._bbuf.append(line) | |
| 130 | |
| 131 class TemplateHeader(object): | |
| 132 """ | |
| 133 Parses and represents a set of header lines. | |
| 134 """ | |
| 2 | 135 _NAMES = [ "errors", "forward", "methods", "python", "template" ] |
| 0 | 136 _FNAMES = [ "hidden" ] |
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137 _ANAMES = [ "load" ] |
| 0 | 138 |
| 139 def __init__(self, string): | |
| 140 # Initialize our state | |
| 141 for i in self._NAMES: | |
| 142 setattr(self, i, None) | |
| 143 for i in self._FNAMES: | |
| 144 setattr(self, i, False) | |
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145 for i in self._ANAMES: |
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146 setattr(self, i, []) |
| 0 | 147 # Parse the string |
| 148 count = 0 | |
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149 nameset = set(self._NAMES + self._FNAMES + self._ANAMES) |
| 0 | 150 seen = set() |
| 151 lines = string.split("\n") | |
| 152 if lines and lines[-1] == "": | |
| 153 del lines[-1] | |
| 154 for line in lines: | |
| 155 # Get line | |
| 156 count += 1 | |
| 157 if not line.startswith("#"): | |
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158 raise TemplateHeaderError("Does not start with '#'.", count) |
| 0 | 159 try: |
| 160 rna, rpa = line.split(maxsplit=1) | |
| 161 except ValueError: | |
| 5 | 162 rna = line.rstrip() |
| 163 rpa = None | |
| 0 | 164 # Get name, ignoring remarks. |
| 165 name = rna[1:] | |
| 166 if name == "rem": | |
| 167 continue | |
| 5 | 168 if name == "end": |
| 169 break | |
| 0 | 170 if name not in nameset: |
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171 raise TemplateHeaderError("Invalid directive: {0!r}".format(rna), count) |
| 0 | 172 if name in seen: |
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173 raise TemplateHeaderError("Duplicate {0!r} directive.".format(rna), count) |
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174 if name not in self._ANAMES: |
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175 seen.add(name) |
| 0 | 176 # Flags |
| 5 | 177 if name in self._FNAMES: |
| 0 | 178 setattr(self, name, True) |
| 179 continue | |
| 180 # Get parameter | |
| 5 | 181 if rpa is None: |
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182 raise TemplateHeaderError("Missing parameter.", count) |
| 0 | 183 param = rpa.strip() |
| 184 for i in [ "'", '"']: | |
| 185 if param.startswith(i) and param.endswith(i): | |
| 186 param = ast.literal_eval(param) | |
| 187 break | |
| 188 # Update this object | |
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189 if name in self._ANAMES: |
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190 getattr(self, name).append(param) |
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191 else: |
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192 setattr(self, name, param) |
| 0 | 193 |
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194 # C h a m e l e o n |
| 2 | 195 # |
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196 # Support for Chameleon templates (the kind TinCan uses). |
| 0 | 197 |
| 198 class ChameleonTemplate(bottle.BaseTemplate): | |
| 199 def prepare(self, **options): | |
| 200 if self.source: | |
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201 self.tpl = PageTemplate(self.source, **options) |
| 0 | 202 else: |
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203 self.tpl = PageTemplateFile(self.filename, encoding=self.encoding, |
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204 search_path=self.lookup, **options) |
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205 # XXX - work around broken Chameleon decoding |
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206 self.tpl.default_encoding = self.encoding |
| 0 | 207 |
| 208 def render(self, *args, **kwargs): | |
| 209 for dictarg in args: | |
| 210 kwargs.update(dictarg) | |
| 211 _defaults = self.defaults.copy() | |
| 212 _defaults.update(kwargs) | |
| 213 return self.tpl.render(**_defaults) | |
| 214 | |
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215 chameleon_template = functools.partial(bottle.template, template_adapter=ChameleonTemplate) |
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216 chameleon_view = functools.partial(bottle.view, template_adapter=ChameleonTemplate) |
| 0 | 217 |
| 2 | 218 # U t i l i t i e s |
| 0 | 219 |
| 220 def _normpath(base, unsplit): | |
| 221 """ | |
| 222 Split, normalize and ensure a possibly relative path is absolute. First | |
| 223 argument is a list of directory names, defining a base. Second | |
| 224 argument is a string, which may either be relative to that base, or | |
| 225 absolute. Only '/' is supported as a separator. | |
| 226 """ | |
| 227 scratch = unsplit.strip('/').split('/') | |
| 228 if not unsplit.startswith('/'): | |
| 229 scratch = base + scratch | |
| 230 ret = [] | |
| 231 for i in scratch: | |
| 232 if i == '.': | |
| 233 continue | |
| 234 if i == '..': | |
| 235 ret.pop() # may raise IndexError | |
| 236 continue | |
| 237 ret.append(i) | |
| 238 return ret | |
| 239 | |
| 240 def _mangle(string): | |
| 241 """ | |
| 242 Turn a possibly troublesome identifier into a mangled one. | |
| 243 """ | |
| 244 first = True | |
| 245 ret = [] | |
| 246 for ch in string: | |
| 247 if ch == '_' or not (ch if first else "x" + ch).isidentifier(): | |
| 248 ret.append('_') | |
| 249 ret.append(b16encode(ch.encode("utf-8")).decode("us-ascii")) | |
| 250 else: | |
| 251 ret.append(ch) | |
| 252 first = False | |
| 253 return ''.join(ret) | |
| 254 | |
| 255 # The TinCan class. Simply a Bottle webapp that contains a forward method, so | |
| 256 # the code-behind can call request.app.forward(). | |
| 257 | |
| 258 class TinCan(bottle.Bottle): | |
| 259 def forward(self, target): | |
| 260 """ | |
| 261 Forward this request to the specified target route. | |
| 262 """ | |
| 263 source = bottle.request.environ['PATH_INFO'] | |
| 264 base = source.strip('/').split('/')[:-1] | |
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265 if bottle.request.environ.get(_FTYPE, False): |
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266 raise TinCanError("{0}: forward from error page".format(source)) |
| 0 | 267 try: |
| 268 exc = ForwardException('/' + '/'.join(_normpath(base, target))) | |
| 269 except IndexError as e: | |
| 270 raise TinCanError("{0}: invalid forward to {1!r}".format(source, target)) from e | |
| 271 raise exc | |
| 272 | |
| 2 | 273 # C o d e B e h i n d |
| 274 # | |
| 0 | 275 # Represents the code-behind of one of our pages. This gets subclassed, of |
| 276 # course. | |
| 277 | |
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278 class BasePage(object): |
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279 """ |
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280 The parent class of both error and normal pages' code-behind. |
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281 """ |
| 0 | 282 def handle(self): |
| 283 """ | |
| 284 This is the entry point for the code-behind logic. It is intended | |
| 285 to be overridden. | |
| 286 """ | |
| 287 pass | |
| 288 | |
| 289 def export(self): | |
| 290 """ | |
| 291 Export template variables. The default behavior is to export all | |
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292 non-hidden non-callables that don't start with an underscore. |
| 0 | 293 This method can be overridden if a different behavior is |
| 294 desired. It should always return a dict or dict-like object. | |
| 295 """ | |
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296 ret = { 'page': self } |
| 0 | 297 for name in dir(self): |
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298 if name in self._HIDDEN or name.startswith('_'): |
| 0 | 299 continue |
| 300 value = getattr(self, name) | |
| 301 if callable(value): | |
| 302 continue | |
| 303 ret[name] = value | |
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304 return ret |
| 0 | 305 |
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306 class Page(BasePage): |
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307 """ |
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308 The code-behind for a normal page. |
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309 """ |
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310 # Non-private things we refuse to export anyhow. |
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311 _HIDDEN = set([ "request", "response" ]) |
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312 |
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313 def __init__(self, req, resp): |
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314 """ |
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315 Constructor. This is a lightweight operation. |
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316 """ |
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317 self.request = req # app context is request.app in Bottle |
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318 self.response = resp |
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319 |
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320 class ErrorPage(BasePage): |
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321 """ |
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322 The code-behind for an error page. |
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323 """ |
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324 _HIDDEN = set() |
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325 |
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326 def __init__(self, req, err): |
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327 """ |
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328 Constructor. This is a lightweight operation. |
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329 """ |
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330 self.request = req |
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331 self.error = err |
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332 |
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333 # I n c l u s i o n |
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334 # |
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335 # Most processing is in the TinCanRoute class; this just interprets and |
|
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336 # represents arguments to the #load header directive. |
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337 |
|
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338 class _LoadedFile(object): |
|
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339 def __init__(self, raw): |
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340 if raw.startswith('<') and raw.endswith('>'): |
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341 raw = raw[1:-1] |
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342 self.in_lib = True |
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343 else: |
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344 self.in_lib = False |
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345 equals = raw.find('=') |
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346 if equals < 0: |
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347 self.vname = os.path.splitext(os.path.basename(raw))[0] |
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348 self.fname = raw |
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349 else: |
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350 self.vname = raw[:equals] |
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351 self.fname = raw[equals+1:] |
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352 if self.vname == "": |
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353 raise ValueError("empty variable name") |
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354 if self.fname == "": |
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355 raise ValueError("empty file name") |
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356 if not self.fname.endswith(_IEXTEN): |
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357 raise ValueError("file does not end in {0}".format(_IEXTEN)) |
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358 |
| 34 | 359 # Using a cache is likely to help efficiency a lot, since many pages |
| 43 | 360 # will typically #load the same standard stuff. Except if we're |
| 361 # multithreading, then we want each page's templates to be private. | |
| 34 | 362 _tcache = {} |
| 43 | 363 def _get_template_cache(name, direct, coding): |
| 34 | 364 aname = os.path.abspath(os.path.join(direct, name)) |
| 365 if aname not in _tcache: | |
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366 tmpl = ChameleonTemplate(name=name, lookup=[direct], encoding=coding) |
| 34 | 367 assert aname == tmpl.filename |
| 368 _tcache[aname] = tmpl | |
| 369 return _tcache[aname] | |
| 370 | |
| 43 | 371 def _get_template_nocache(name, direct, coding): |
| 372 return ChameleonTemplate(name=name, lookup=[direct], encoding=coding) | |
| 373 | |
| 2 | 374 # R o u t e s |
| 375 # | |
| 0 | 376 # Represents a route in TinCan. Our launcher creates these on-the-fly based |
| 377 # on the files it finds. | |
| 378 | |
| 2 | 379 _ERRMIN = 400 |
| 380 _ERRMAX = 599 | |
|
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381 _IEXTEN = ".pt" |
| 2 | 382 _PEXTEN = ".py" |
| 383 _TEXTEN = ".pspx" | |
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384 _FLOOP = "tincan.forwards" |
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385 _FORIG = "tincan.origin" |
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386 _FTYPE = "tincan.iserror" |
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387 _INDEX = "/index" + _TEXTEN |
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388 _LINDEX = len(_INDEX) |
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389 _INDICES = [ _INDEX, "/index.html", "/index.htm" ] |
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390 |
| 43 | 391 class _TinCanBaseRoute(object): |
| 392 """ | |
| 393 The base class for all NON ERROR routes. Error routes are just a little | |
| 394 bit different. | |
| 395 """ | |
| 396 def __init__(self, launcher, name, subdir): | |
| 397 global _get_template_cache, _get_template_nocache | |
| 398 if launcher.multithread: | |
| 399 self.lock = Lock() | |
| 400 self.get_template = _get_template_nocache | |
| 401 else: | |
| 402 self.lock = _DummyLock() | |
| 403 self.get_template = _get_template_cache | |
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404 self.logger = launcher.logger |
| 43 | 405 |
| 406 def urljoin(self, *args): | |
| 407 """ | |
| 408 Normalize a parsed-out URL fragment. | |
| 409 """ | |
| 410 args = list(args) | |
| 411 if args[0] == '/': | |
| 412 args[0] = '' | |
| 413 return '/'.join(args) | |
| 414 | |
| 415 def launch(self): | |
| 416 raise NotImplementedError("This must be overridden.") | |
| 417 | |
| 418 def __call__(self): | |
| 419 raise NotImplementedError("This must be overridden.") | |
| 420 | |
| 421 class _TinCanStaticRoute(_TinCanBaseRoute): | |
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422 """ |
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423 A route to a static file. These are useful for test servers. For |
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424 production servers, one is better off using a real web server and |
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425 a WSGI plugin, and having that handle static files. Much of this |
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426 logic is cribbed from the Bottle source code (we don't call it |
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427 directly because it is undocumented and thus subject to change). |
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428 """ |
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429 def __init__(self, launcher, name, subdir): |
| 43 | 430 super().__init__(launcher, name, subdir) |
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431 self._app = launcher.app |
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432 self._fspath = os.path.join(launcher.fsroot, *subdir, name) |
| 43 | 433 self._urlpath = self.urljoin(launcher.urlroot, *subdir, name) |
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434 self._type = mimetypes.guess_type(name)[0] |
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435 if self._type is None: |
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436 self._type = "application/octet-stream" |
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437 if self._type.startswith("text/"): |
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438 self._encoding = launcher.encoding |
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439 self._type += "; charset=" + launcher.encoding |
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440 else: |
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441 self._encoding = None |
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442 |
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443 def launch(self): |
|
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444 self.logger.info("adding static route: %s", self._urlpath) |
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445 self._app.route(self._urlpath, 'GET', self) |
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446 for i in _INDICES: |
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447 if self._urlpath.endswith(i): |
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448 li = len(i) |
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449 for j in [ self._urlpath[:1-li], self._urlpath[:-li] ]: |
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450 if j: |
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451 self.logger.info("adding static route: %s", j) |
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452 self._app.route(j, 'GET', self) |
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453 |
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454 def _parse_date(self, ims): |
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455 """ |
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456 Parse rfc1123, rfc850 and asctime timestamps and return UTC epoch. |
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457 """ |
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458 try: |
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459 ts = email.utils.parsedate_tz(ims) |
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460 return time.mktime(ts[:8] + (0,)) - (ts[9] or 0) - time.timezone |
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461 except (TypeError, ValueError, IndexError, OverflowError): |
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462 return None |
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463 |
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464 def __call__(self): |
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465 # Get file contents and time stamp. If we can't, return an |
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466 # appropriate HTTP error response. |
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467 try: |
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468 with open(self._fspath, "rb") as fp: |
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469 mtime = os.fstat(fp.fileno()).st_mtime |
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470 bytes = fp.read() |
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471 except FileNotFoundError as e: |
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472 return bottle.HTTPError(status=404, exception=e) |
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473 except PermissionError as e: |
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474 return bottle.HTTPError(status=403, exception=e) |
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475 except OSError as e: |
|
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476 self.logger.exception("unexpected exception reading %r", self._fspath) |
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477 return bottle.HTTPError(status=500, exception=e) |
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478 # Establish preliminary standard headers. |
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479 headers = { |
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480 "Content-Type": self._type, |
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481 "Last-Modified": time.strftime("%a, %d %b %Y %H:%M:%S GMT", time.gmtime(mtime)), |
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482 } |
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483 if self._encoding: |
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484 headers["Content-Encoding"] = self._encoding |
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485 # Support the If-Modified-Since request header. |
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486 ims = bottle.request.environ.get('HTTP_IF_MODIFIED_SINCE') |
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487 if ims: |
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488 ims = self._parse_date(ims.split(";")[0].strip()) |
| 41 | 489 if ims is not None and ims >= int(mtime): |
|
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490 headers["Content-Length"] = "0" |
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491 return bottle.HTTPResponse(body=b"", status=304, headers=headers) |
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492 # Standard response. |
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493 headers["Content-Length"] = str(len(bytes)) |
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494 return bottle.HTTPResponse(body=bytes, status=200, headers=headers) |
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495 |
|
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496 class _TinCanErrorRoute(object): |
|
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497 """ |
|
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498 A route to an error page. These don't get routes created for them, |
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499 and are only reached if an error routes them there. Unless you create |
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500 custom code-behind, only two variables are available to your template: |
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501 request (bottle.Request) and error (bottle.HTTPError). |
|
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502 """ |
|
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503 def __init__(self, template, loads, klass, lock, logger): |
|
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504 self._template = template |
|
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505 self._template.prepare() |
|
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506 self._loads = loads |
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507 self._class = klass |
| 43 | 508 self.lock = lock |
|
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509 self.logger = logger |
|
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510 |
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511 def __call__(self, e): |
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512 bottle.request.environ[_FTYPE] = True |
|
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513 try: |
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514 obj = self._class(bottle.request, e) |
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515 obj.handle() |
|
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516 tvars = self._loads.copy() |
|
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517 tvars.update(obj.export()) |
| 43 | 518 with self.lock: |
| 519 return self._template.render(tvars).lstrip('\n') | |
|
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520 except bottle.HTTPResponse as e: |
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521 return e |
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522 except Exception as e: |
|
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523 self.logger.exception("unexpected exception in error page") |
|
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524 # Bottle doesn't allow error handlers to themselves cause |
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525 # errors, most likely as a measure to prevent looping. So |
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526 # this will cause a "Critical error while processing request" |
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527 # page to be displayed, and any installed error pages to be |
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528 # ignored. |
|
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529 raise bottle.HTTPError(status=500, exception=e) |
|
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530 |
| 43 | 531 class _TinCanRoute(_TinCanBaseRoute): |
| 0 | 532 """ |
| 533 A route created by the TinCan launcher. | |
| 534 """ | |
| 535 def __init__(self, launcher, name, subdir): | |
| 43 | 536 super().__init__(launcher, name, subdir) |
| 0 | 537 self._fsroot = launcher.fsroot |
| 538 self._urlroot = launcher.urlroot | |
| 539 self._name = name | |
| 2 | 540 self._python = name + _PEXTEN |
| 541 self._fspath = os.path.join(launcher.fsroot, *subdir, name + _TEXTEN) | |
| 43 | 542 self._urlpath = self.urljoin(launcher.urlroot, *subdir, name + _TEXTEN) |
| 0 | 543 self._origin = self._urlpath |
| 544 self._subdir = subdir | |
| 545 self._seen = set() | |
| 546 self._app = launcher.app | |
|
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547 self._encoding = launcher.encoding |
| 0 | 548 |
| 2 | 549 def launch(self): |
| 0 | 550 """ |
| 551 Launch a single page. | |
| 552 """ | |
| 553 # Build master and header objects, process #forward directives | |
|
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554 oheader = None |
| 0 | 555 while True: |
|
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556 try: |
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557 self._template = TemplateFile(self._fspath) |
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558 except IOError as e: |
|
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559 if oheader is not None: |
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560 note = "{0}: invalid #forward: ".format(self._origin) |
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561 else: |
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562 note = "" |
|
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563 raise TinCanError("{0}{1!s}".format(note, e)) from e |
|
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564 try: |
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|
565 self._header = TemplateHeader(self._template.header) |
|
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566 except TemplateHeaderError as e: |
|
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|
567 raise TinCanError("{0}: {1!s}".format(self._fspath, e)) from e |
|
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|
568 if oheader is None: |
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|
569 oheader = self._header # save original header |
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570 elif (oheader.errors is None) != (self._header.errors is None): |
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571 raise TinCanError("{0}: invalid #forward".format(self._origin)) |
| 0 | 572 if self._header.forward is None: |
| 573 break | |
|
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|
574 # self.logger.debug("forwarding from: %s", self._urlpath) # debug |
| 0 | 575 self._redirect() |
|
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|
576 # self.logger.debug("forwarded to: %s", self._urlpath) # debug |
|
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|
577 # If this is a #hidden page, we ignore it for now, since hidden pages |
| 0 | 578 # don't get routes made for them. |
|
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579 if oheader.hidden and not oheader.errors: |
| 0 | 580 return |
|
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|
581 # Get the code-behind #python |
|
15
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582 if self._header.python is None: |
|
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583 self._python_specified = False |
|
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584 else: |
| 2 | 585 if not self._header.python.endswith(_PEXTEN): |
|
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|
586 raise TinCanError("{0}: #python files must end in {1}".format(self._urlpath, _PEXTEN)) |
| 0 | 587 self._python = self._header.python |
|
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588 self._python_specified = True |
| 0 | 589 # Obtain a class object by importing and introspecting a module. |
| 3 | 590 self._getclass() |
|
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|
591 # Build body object (#template) and obtain #loads. |
| 3 | 592 if self._header.template is not None: |
| 593 if not self._header.template.endswith(_TEXTEN): | |
|
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|
594 raise TinCanError("{0}: #template files must end in {1}".format(self._urlpath, _TEXTEN)) |
| 16 | 595 try: |
|
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596 rtpath = self._splitpath(self._header.template) |
|
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597 tpath = os.path.normpath(os.path.join(self._fsroot, *rtpath)) |
| 16 | 598 tfile = TemplateFile(tpath) |
|
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599 except OSError as e: |
| 16 | 600 raise TinCanError("{0}: invalid #template: {1!s}".format(self._urlpath, e)) from e |
| 601 except IndexError as e: | |
| 602 raise TinCanError("{0}: invalid #template".format(self._urlpath)) from e | |
|
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Recognize index.pspx (and index.html, and index.htm if static).
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603 self._body = self._mktemplate(tfile.body, self.urljoin(*rtpath)) |
| 3 | 604 else: |
|
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|
605 self._body = self._mktemplate(self._template.body, self._urlpath) |
|
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|
606 self._body.prepare() |
|
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|
607 # Process loads |
|
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608 self._loads = {} |
|
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|
609 for load in self._header.load: |
|
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|
610 try: |
|
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611 load = _LoadedFile(load) |
|
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|
612 except ValueError as e: |
|
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|
613 raise TinCanError("{0}: bad #load: {1!s}".format(self._urlpath, e)) from e |
|
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|
614 if load.in_lib: |
|
29
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|
615 fdir = os.path.join(self._fsroot, _WINF, "tlib") |
|
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616 else: |
| 32 | 617 fdir = os.path.join(self._fsroot, *self._subdir) |
|
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618 try: |
| 43 | 619 tmpl = self.get_template(load.fname, fdir, self._encoding) |
|
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|
620 except Exception as e: |
|
35
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|
621 raise TinCanError("{0}: bad #load: {1!s}".format(self._urlpath, e)) from e |
|
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622 self._loads[load.vname] = tmpl.tpl |
|
9
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|
623 # If this is an #errors page, register it as such. |
|
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|
624 if oheader.errors is not None: |
|
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625 self._mkerror(oheader.errors) |
|
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626 return # this implies #hidden |
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|
627 # Get #methods for this route |
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628 if self._header.methods is None: |
|
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629 methods = [ 'GET' ] |
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630 else: |
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631 methods = [ i.upper() for i in self._header.methods.split() ] |
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632 if not methods: |
|
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633 raise TinCanError("{0}: no #methods specified".format(self._urlpath)) |
| 3 | 634 # Register this thing with Bottle |
|
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Recognize index.pspx (and index.html, and index.htm if static).
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635 mtxt = ','.join(methods) |
|
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Recognize index.pspx (and index.html, and index.htm if static).
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636 self.logger.info("adding route: %s (%s)", self._origin, mtxt) |
| 3 | 637 self._app.route(self._origin, methods, self) |
|
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Recognize index.pspx (and index.html, and index.htm if static).
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638 if self._origin.endswith(_INDEX): |
|
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Recognize index.pspx (and index.html, and index.htm if static).
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639 for i in [ self._origin[:1-_LINDEX], self._origin[:-_LINDEX] ]: |
|
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640 if i: |
|
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Recognize index.pspx (and index.html, and index.htm if static).
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641 self.logger.info("adding route: %s (%s)", i, mtxt) |
|
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|
642 self._app.route(i, methods, self) |
| 3 | 643 |
|
57
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Fix lack of error detection and recovery in template parsing.
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644 def _mktemplate(self, source, name): |
|
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Fix lack of error detection and recovery in template parsing.
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|
645 try: |
|
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Fix lack of error detection and recovery in template parsing.
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|
646 return ChameleonTemplate(source=source, encoding=self._encoding) |
|
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Fix lack of error detection and recovery in template parsing.
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647 except TemplateError as e: |
|
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Fix lack of error detection and recovery in template parsing.
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648 raise TinCanError("{0}: {1!s}".format(name, e)) from e |
|
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649 |
| 3 | 650 def _splitpath(self, unsplit): |
| 651 return _normpath(self._subdir, unsplit) | |
| 652 | |
|
11
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Update documentation, fix some #forward bugs.
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653 def _mkerror(self, rerrors): |
| 3 | 654 try: |
|
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|
655 errors = [ int(i) for i in rerrors.split() ] |
| 3 | 656 except ValueError as e: |
| 657 raise TinCanError("{0}: bad #errors line".format(self._urlpath)) from e | |
| 658 if not errors: | |
| 659 errors = range(_ERRMIN, _ERRMAX+1) | |
|
37
ce67eac10fc7
Allow global character encoding specification.
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|
660 route = _TinCanErrorRoute( |
|
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|
661 ChameleonTemplate(source=self._template.body, encoding=self._encoding), |
|
45
969f515b505b
Make it easy to leave stdout and stderr alone (untested).
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|
662 self._loads, self._class, self.lock, self.logger) |
| 3 | 663 for error in errors: |
| 664 if error < _ERRMIN or error > _ERRMAX: | |
| 665 raise TinCanError("{0}: bad #errors code".format(self._urlpath)) | |
| 5 | 666 self._app.error_handler[error] = route # XXX |
| 3 | 667 |
|
7
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Eliminate a stat() call, allow no code-behind on pages.
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|
668 def _gettime(self, path): |
|
57ec65f527e9
Eliminate a stat() call, allow no code-behind on pages.
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|
669 try: |
|
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Eliminate a stat() call, allow no code-behind on pages.
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670 return os.stat(path).st_mtime |
|
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671 except FileNotFoundError: |
|
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Eliminate a stat() call, allow no code-behind on pages.
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672 return 0 |
| 8 | 673 except OSError as e: |
|
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674 raise TinCanError(str(e)) from e |
|
7
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|
675 |
| 3 | 676 def _getclass(self): |
|
15
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Fix bugs in #python directive, make code-behind class loading simpler.
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|
677 try: |
|
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Fix bugs in #python directive, make code-behind class loading simpler.
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|
678 pypath = os.path.normpath(os.path.join(self._fsroot, *self._splitpath(self._python))) |
|
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|
679 except IndexError as e: |
|
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Fix bugs in #python directive, make code-behind class loading simpler.
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|
680 raise TinCanError("{0}: invalid #python".format(self._urlpath)) from e |
|
9
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|
681 klass = ErrorPage if self._header.errors else Page |
|
7
57ec65f527e9
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|
682 # Give 'em a default code-behind if they don't furnish one |
|
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Eliminate a stat() call, allow no code-behind on pages.
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6
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|
683 pytime = self._gettime(pypath) |
|
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|
684 if not pytime: |
|
15
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Fix bugs in #python directive, make code-behind class loading simpler.
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|
685 if self._python_specified: |
|
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Fix bugs in #python directive, make code-behind class loading simpler.
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|
686 raise TinCanError("{0}: #python file not found".format(self._urlpath)) |
|
9
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8
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|
687 self._class = klass |
|
7
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Eliminate a stat() call, allow no code-behind on pages.
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6
diff
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|
688 return |
|
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Eliminate a stat() call, allow no code-behind on pages.
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|
689 # Else load the code-behind from a .py file |
| 0 | 690 pycpath = pypath + 'c' |
|
7
57ec65f527e9
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|
691 pyctime = self._gettime(pycpath) |
| 0 | 692 try: |
|
7
57ec65f527e9
Eliminate a stat() call, allow no code-behind on pages.
David Barts <n5jrn@me.com>
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6
diff
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|
693 if pyctime < pytime: |
|
4
0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
David Barts <n5jrn@me.com>
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3
diff
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|
694 py_compile.compile(pypath, cfile=pycpath, doraise=True) |
|
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Finally got "hello, world" working. Still likely many bugs.
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|
695 except py_compile.PyCompileError as e: |
|
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Finally got "hello, world" working. Still likely many bugs.
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|
696 raise TinCanError(str(e)) from e |
|
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Finally got "hello, world" working. Still likely many bugs.
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|
697 except Exception as e: |
|
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Finally got "hello, world" working. Still likely many bugs.
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|
698 raise TinCanError("{0}: {1!s}".format(pypath, e)) from e |
|
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Finally got "hello, world" working. Still likely many bugs.
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diff
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|
699 try: |
|
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Finally got "hello, world" working. Still likely many bugs.
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diff
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|
700 spec = importlib.util.spec_from_file_location(_mangle(self._name), pycpath) |
| 0 | 701 mod = importlib.util.module_from_spec(spec) |
| 702 spec.loader.exec_module(mod) | |
| 703 except Exception as e: | |
| 16 | 704 raise TinCanError("{0}: error importing: {1!s}".format(pycpath, e)) from e |
|
19
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
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diff
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|
705 # Locate a suitable class. We look for the "deepest" class object |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
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diff
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|
706 # we can find in the inheritance tree. |
| 0 | 707 self._class = None |
|
19
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
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|
708 score = -1 |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
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|
709 ambig = False |
| 0 | 710 for i in dir(mod): |
| 711 v = getattr(mod, i) | |
|
19
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
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diff
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|
712 if not isclass(v): |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
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|
713 continue |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
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|
714 d = self._cldepth(klass, v) |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
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diff
changeset
|
715 if d > score: |
|
15
560c8fb55e4a
Fix bugs in #python directive, make code-behind class loading simpler.
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diff
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|
716 self._class = v |
|
19
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Return the "deepest" subclass; this allows subclassing tincan.Page and
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|
717 score = d |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
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|
718 ambig = False |
|
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Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
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|
719 elif d == score: |
|
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Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
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diff
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|
720 ambig = True |
| 3 | 721 if self._class is None: |
|
9
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Error pages now can have code-behind.
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diff
changeset
|
722 raise TinCanError("{0}: contains no {1} classes".format(pypath, klass.__name__)) |
|
19
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
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18
diff
changeset
|
723 if ambig: |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
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18
diff
changeset
|
724 raise TinCanError("{0}: contains ambiguous {1} classes".format(pypath, klass.__name__)) |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
changeset
|
725 |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
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diff
changeset
|
726 # This might fail for complex inheritance schemes from the classes of |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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18
diff
changeset
|
727 # interest (so don't use them!). |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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18
diff
changeset
|
728 def _cldepth(self, base, klass, count=0): |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
changeset
|
729 if klass is object: |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
changeset
|
730 # not found |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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18
diff
changeset
|
731 return -1 |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
parents:
18
diff
changeset
|
732 elif klass is base: |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
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18
diff
changeset
|
733 # just found |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
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diff
changeset
|
734 return count |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
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18
diff
changeset
|
735 else: |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
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|
736 # must recurse |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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parents:
18
diff
changeset
|
737 for c in klass.__bases__: |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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parents:
18
diff
changeset
|
738 result = self._cldepth(base, c, count=count+1) |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
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18
diff
changeset
|
739 if result > 0: |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
parents:
18
diff
changeset
|
740 return result |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
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diff
changeset
|
741 return -1 |
| 0 | 742 |
| 743 def _redirect(self): | |
| 744 try: | |
| 745 rlist = self._splitpath(self._header.forward) | |
|
4
0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
David Barts <n5jrn@me.com>
parents:
3
diff
changeset
|
746 forw = '/' + '/'.join(rlist) |
|
11
8037bad7d5a8
Update documentation, fix some #forward bugs.
David Barts <n5jrn@me.com>
parents:
9
diff
changeset
|
747 if forw in self._seen: |
|
4
0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
David Barts <n5jrn@me.com>
parents:
3
diff
changeset
|
748 raise TinCanError("{0}: #forward loop".format(self._origin)) |
|
0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
David Barts <n5jrn@me.com>
parents:
3
diff
changeset
|
749 self._seen.add(forw) |
| 0 | 750 rname = rlist.pop() |
| 751 except IndexError as e: | |
| 752 raise TinCanError("{0}: invalid #forward".format(self._urlpath)) from e | |
|
11
8037bad7d5a8
Update documentation, fix some #forward bugs.
David Barts <n5jrn@me.com>
parents:
9
diff
changeset
|
753 name, ext = os.path.splitext(rname) |
| 2 | 754 if ext != _TEXTEN: |
| 0 | 755 raise TinCanError("{0}: invalid #forward".format(self._urlpath)) |
| 756 self._subdir = rlist | |
| 2 | 757 self._python = name + _PEXTEN |
| 0 | 758 self._fspath = os.path.join(self._fsroot, *self._subdir, rname) |
| 43 | 759 self._urlpath = '/' + self.urljoin(*self._subdir, rname) |
| 0 | 760 |
|
1
94b36e721500
Another check in to back stuff up.
David Barts <n5jrn@me.com>
parents:
0
diff
changeset
|
761 def __call__(self): |
| 0 | 762 """ |
| 763 This gets called by the framework AFTER the page is launched. | |
| 764 """ | |
|
1
94b36e721500
Another check in to back stuff up.
David Barts <n5jrn@me.com>
parents:
0
diff
changeset
|
765 target = None |
|
94b36e721500
Another check in to back stuff up.
David Barts <n5jrn@me.com>
parents:
0
diff
changeset
|
766 try: |
|
17
8186de188daf
Improve the run-time error handling in code-behinds.
David Barts <n5jrn@me.com>
parents:
16
diff
changeset
|
767 obj = self._class(bottle.request, bottle.response) |
|
1
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768 obj.handle() |
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769 tvars = self._loads.copy() |
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770 tvars.update(obj.export()) |
| 43 | 771 with self.lock: |
| 772 return self._body.render(tvars).lstrip('\n') | |
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773 except ForwardException as fwd: |
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774 target = fwd.target |
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775 except bottle.HTTPResponse as e: |
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776 return e |
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777 except Exception as e: |
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778 self.logger.exception("%s: unexpected exception", self._urlpath) |
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779 raise bottle.HTTPError(status=500, exception=e) |
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780 if target is None: |
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781 self.logger.error("%s: unexpected null target", self._urlpath) |
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782 raise bottle.HTTPError(status=500, exception=TinCanError(message)) |
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783 # We get here if we are doing a server-side programmatic |
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784 # forward. |
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785 environ = bottle.request.environ |
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786 if _FORIG not in environ: |
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787 environ[_FORIG] = self._urlpath |
| 2 | 788 if _FLOOP not in environ: |
| 789 environ[_FLOOP] = set([self._urlpath]) | |
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790 elif target in environ[_FLOOP]: |
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791 self.logger.error("%s: forward loop detected", environ[_FORIG]) |
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792 raise bottle.HTTPError(status=500, exception=TinCanError(message)) |
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793 environ[_FLOOP].add(target) |
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794 environ['bottle.raw_path'] = target |
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795 environ['PATH_INFO'] = urllib.parse.quote(target) |
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796 route, args = self._app.router.match(environ) |
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797 environ['route.handle'] = environ['bottle.route'] = route |
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798 environ['route.url_args'] = args |
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799 return route.call(**args) |
| 0 | 800 |
| 43 | 801 # M u t e x |
| 802 # | |
| 803 # A dummy lock class, which is what we use if we don't need locking. | |
| 804 | |
| 805 class _DummyLock(object): | |
| 806 def acquire(self, blocking=True, timeout=-1): | |
| 807 pass | |
| 808 | |
| 809 def release(self): | |
| 810 pass | |
| 811 | |
| 812 def __enter__(self): | |
| 813 self.acquire() | |
| 814 return self | |
| 815 | |
| 816 def __exit__(self, exc_type, exc_value, traceback): | |
| 817 self.release() | |
| 818 return False | |
| 819 | |
| 2 | 820 # L a u n c h e r |
| 821 | |
| 822 _WINF = "WEB-INF" | |
| 823 _BANNED = set([_WINF]) | |
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824 _EBANNED = set([_IEXTEN, _TEXTEN, _PEXTEN, _PEXTEN+"c"]) |
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825 ENCODING = "utf-8" |
| 53 | 826 _BITBUCKET = logging.getLogger(__name__) |
| 827 _BITBUCKET.addHandler(logging.NullHandler) | |
| 2 | 828 |
| 829 class _Launcher(object): | |
| 830 """ | |
| 831 Helper class for launching webapps. | |
| 832 """ | |
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833 def __init__(self, fsroot, urlroot, multithread): |
| 2 | 834 """ |
| 835 Lightweight constructor. The real action happens in .launch() below. | |
| 836 """ | |
| 837 self.fsroot = fsroot | |
| 838 self.urlroot = urlroot | |
| 839 self.app = None | |
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840 self.errors = 0 |
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841 self.debug = False |
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842 self.encoding = ENCODING |
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843 self.static = False |
| 43 | 844 self.multithread = multithread |
| 53 | 845 self.logger = _BITBUCKET |
| 2 | 846 |
| 847 def launch(self): | |
| 848 """ | |
| 849 Does the actual work of launching something. XXX - modifies sys.path | |
| 850 and never un-modifies it. | |
| 851 """ | |
| 852 # Sanity checks | |
| 853 if not self.urlroot.startswith("/"): | |
|
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854 self.errors = 1 |
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855 self.logger("urlroot not absolute: {0!r}".format(self.urlroot)) |
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856 return self |
| 2 | 857 if not os.path.isdir(self.fsroot): |
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858 self.errors = 1 |
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859 self.logger("no such directory: {0!r}".format(self.fsroot)) |
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860 return self |
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861 # Make any needed directories. Refuse to launch things that don't |
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862 # contain WEB-INF, to prevent accidental launches of undesired |
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863 # directory trees containing sensitive files. |
| 2 | 864 winf = os.path.join(self.fsroot, _WINF) |
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865 if not os.path.isdir(winf): |
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866 self.errors = 1 |
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867 self.logger("no WEB-INF directory in {0!r}".format(self.fsroot)) |
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868 return self |
| 2 | 869 lib = os.path.join(winf, "lib") |
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870 for i in [ lib ]: |
| 2 | 871 if not os.path.isdir(i): |
| 872 os.mkdir(i) | |
| 873 # Add our private lib directory to sys.path | |
| 874 sys.path.insert(1, os.path.abspath(lib)) | |
| 875 # Do what we gotta do | |
| 876 self.app = TinCan() | |
| 56 | 877 config = self.app.config |
| 878 config['tincan.fsroot'] = os.path.abspath(self.fsroot) | |
| 879 config['tincan.urlroot'] = self.urlroot | |
| 880 config['tincan.logger'] = self.logger | |
| 881 config['tincan.encoding'] = self.encoding | |
| 2 | 882 self._launch([]) |
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883 return self |
| 2 | 884 |
| 885 def _launch(self, subdir): | |
| 886 for entry in os.listdir(os.path.join(self.fsroot, *subdir)): | |
|
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887 if entry.startswith("."): |
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888 continue # hidden file |
| 2 | 889 if not subdir and entry in _BANNED: |
| 890 continue | |
| 891 etype = os.stat(os.path.join(self.fsroot, *subdir, entry)).st_mode | |
| 892 if S_ISREG(etype): | |
| 893 ename, eext = os.path.splitext(entry) | |
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894 if eext == _TEXTEN: |
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895 route = _TinCanRoute(self, ename, subdir) |
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896 else: |
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897 if eext in _EBANNED: |
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898 continue |
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899 if self.static: |
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900 route = _TinCanStaticRoute(self, entry, subdir) |
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901 else: |
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902 continue |
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903 try: |
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904 route.launch() |
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905 except TinCanError as e: |
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906 if self.logger.getEffectiveLevel() <= logging.DEBUG: |
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907 self.logger.exception(str(e)) |
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908 else: |
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909 self.logger.error(str(e)) |
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910 self.errors += 1 |
| 2 | 911 elif S_ISDIR(etype): |
| 912 self._launch(subdir + [entry]) | |
| 913 | |
| 53 | 914 def launch(fsroot=None, urlroot='/', multithread=True, **kwargs): |
| 2 | 915 """ |
| 916 Launch and return a TinCan webapp. Does not run the app; it is the | |
| 917 caller's responsibility to call app.run() | |
| 918 """ | |
| 919 if fsroot is None: | |
| 920 fsroot = os.getcwd() | |
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921 launcher = _Launcher(fsroot, urlroot, multithread) |
| 54 | 922 allowed = set(["logger", "encoding", "static"]) |
| 923 for k, v in kwargs.items(): | |
| 924 if k not in allowed: | |
| 925 raise TypeError("launch() got an unexpected keyword argument {0!r}".format(k)) | |
| 926 setattr(launcher, k, v) | |
|
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927 launcher.launch() |
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928 return launcher.app, launcher.errors |
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929 |
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930 # XXX - We cannot implement a command-line launcher here; see the |
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931 # launcher script for why. |