436 lines
13 KiB
Python
436 lines
13 KiB
Python
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import itertools
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import linecache
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import os
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import re
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import sys
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import sysconfig
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import traceback
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import typing as t
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from markupsafe import escape
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from ..utils import cached_property
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from .console import Console
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HEADER = """\
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<!doctype html>
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<html lang=en>
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<head>
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<title>%(title)s // Werkzeug Debugger</title>
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<link rel="stylesheet" href="?__debugger__=yes&cmd=resource&f=style.css">
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<link rel="shortcut icon"
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href="?__debugger__=yes&cmd=resource&f=console.png">
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<script src="?__debugger__=yes&cmd=resource&f=debugger.js"></script>
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<script>
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var CONSOLE_MODE = %(console)s,
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EVALEX = %(evalex)s,
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EVALEX_TRUSTED = %(evalex_trusted)s,
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SECRET = "%(secret)s";
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</script>
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</head>
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<body style="background-color: #fff">
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<div class="debugger">
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"""
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FOOTER = """\
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<div class="footer">
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Brought to you by <strong class="arthur">DON'T PANIC</strong>, your
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friendly Werkzeug powered traceback interpreter.
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</div>
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</div>
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<div class="pin-prompt">
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<div class="inner">
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<h3>Console Locked</h3>
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<p>
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The console is locked and needs to be unlocked by entering the PIN.
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You can find the PIN printed out on the standard output of your
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shell that runs the server.
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<form>
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<p>PIN:
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<input type=text name=pin size=14>
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<input type=submit name=btn value="Confirm Pin">
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</form>
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</div>
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</div>
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</body>
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</html>
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"""
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PAGE_HTML = (
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HEADER
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+ """\
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<h1>%(exception_type)s</h1>
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<div class="detail">
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<p class="errormsg">%(exception)s</p>
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</div>
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<h2 class="traceback">Traceback <em>(most recent call last)</em></h2>
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%(summary)s
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<div class="plain">
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<p>
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This is the Copy/Paste friendly version of the traceback.
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</p>
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<textarea cols="50" rows="10" name="code" readonly>%(plaintext)s</textarea>
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</div>
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<div class="explanation">
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The debugger caught an exception in your WSGI application. You can now
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look at the traceback which led to the error. <span class="nojavascript">
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If you enable JavaScript you can also use additional features such as code
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execution (if the evalex feature is enabled), automatic pasting of the
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exceptions and much more.</span>
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</div>
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"""
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+ FOOTER
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+ """
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<!--
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%(plaintext_cs)s
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-->
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"""
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)
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CONSOLE_HTML = (
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HEADER
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+ """\
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<h1>Interactive Console</h1>
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<div class="explanation">
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In this console you can execute Python expressions in the context of the
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application. The initial namespace was created by the debugger automatically.
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</div>
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<div class="console"><div class="inner">The Console requires JavaScript.</div></div>
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"""
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+ FOOTER
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)
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SUMMARY_HTML = """\
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<div class="%(classes)s">
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%(title)s
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<ul>%(frames)s</ul>
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%(description)s
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</div>
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"""
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FRAME_HTML = """\
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<div class="frame" id="frame-%(id)d">
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<h4>File <cite class="filename">"%(filename)s"</cite>,
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line <em class="line">%(lineno)s</em>,
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in <code class="function">%(function_name)s</code></h4>
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<div class="source %(library)s">%(lines)s</div>
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</div>
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"""
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def _process_traceback(
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exc: BaseException,
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te: t.Optional[traceback.TracebackException] = None,
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*,
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skip: int = 0,
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hide: bool = True,
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) -> traceback.TracebackException:
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if te is None:
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te = traceback.TracebackException.from_exception(exc, lookup_lines=False)
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# Get the frames the same way StackSummary.extract did, in order
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# to match each frame with the FrameSummary to augment.
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frame_gen = traceback.walk_tb(exc.__traceback__)
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limit = getattr(sys, "tracebacklimit", None)
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if limit is not None:
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if limit < 0:
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limit = 0
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frame_gen = itertools.islice(frame_gen, limit)
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if skip:
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frame_gen = itertools.islice(frame_gen, skip, None)
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del te.stack[:skip]
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new_stack: t.List[DebugFrameSummary] = []
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hidden = False
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# Match each frame with the FrameSummary that was generated.
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# Hide frames using Paste's __traceback_hide__ rules. Replace
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# all visible FrameSummary with DebugFrameSummary.
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for (f, _), fs in zip(frame_gen, te.stack):
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if hide:
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hide_value = f.f_locals.get("__traceback_hide__", False)
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if hide_value in {"before", "before_and_this"}:
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new_stack = []
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hidden = False
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if hide_value == "before_and_this":
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continue
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elif hide_value in {"reset", "reset_and_this"}:
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hidden = False
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if hide_value == "reset_and_this":
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continue
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elif hide_value in {"after", "after_and_this"}:
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hidden = True
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if hide_value == "after_and_this":
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continue
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elif hide_value or hidden:
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continue
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frame_args: t.Dict[str, t.Any] = {
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"filename": fs.filename,
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"lineno": fs.lineno,
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"name": fs.name,
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"locals": f.f_locals,
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"globals": f.f_globals,
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}
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if hasattr(fs, "colno"):
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frame_args["colno"] = fs.colno
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frame_args["end_colno"] = fs.end_colno # type: ignore[attr-defined]
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new_stack.append(DebugFrameSummary(**frame_args))
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# The codeop module is used to compile code from the interactive
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# debugger. Hide any codeop frames from the bottom of the traceback.
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while new_stack:
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module = new_stack[0].global_ns.get("__name__")
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if module is None:
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module = new_stack[0].local_ns.get("__name__")
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if module == "codeop":
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del new_stack[0]
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else:
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break
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te.stack[:] = new_stack
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if te.__context__:
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context_exc = t.cast(BaseException, exc.__context__)
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te.__context__ = _process_traceback(context_exc, te.__context__, hide=hide)
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if te.__cause__:
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cause_exc = t.cast(BaseException, exc.__cause__)
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te.__cause__ = _process_traceback(cause_exc, te.__cause__, hide=hide)
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return te
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class DebugTraceback:
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__slots__ = ("_te", "_cache_all_tracebacks", "_cache_all_frames")
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def __init__(
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self,
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exc: BaseException,
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te: t.Optional[traceback.TracebackException] = None,
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*,
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skip: int = 0,
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hide: bool = True,
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) -> None:
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self._te = _process_traceback(exc, te, skip=skip, hide=hide)
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def __str__(self) -> str:
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return f"<{type(self).__name__} {self._te}>"
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@cached_property
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def all_tracebacks(
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self,
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) -> t.List[t.Tuple[t.Optional[str], traceback.TracebackException]]:
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out = []
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current = self._te
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while current is not None:
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if current.__cause__ is not None:
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chained_msg = (
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"The above exception was the direct cause of the"
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" following exception"
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)
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chained_exc = current.__cause__
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elif current.__context__ is not None and not current.__suppress_context__:
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chained_msg = (
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"During handling of the above exception, another"
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" exception occurred"
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)
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chained_exc = current.__context__
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else:
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chained_msg = None
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chained_exc = None
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out.append((chained_msg, current))
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current = chained_exc
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return out
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@cached_property
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def all_frames(self) -> t.List["DebugFrameSummary"]:
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return [
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f for _, te in self.all_tracebacks for f in te.stack # type: ignore[misc]
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]
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def render_traceback_text(self) -> str:
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return "".join(self._te.format())
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def render_traceback_html(self, include_title: bool = True) -> str:
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library_frames = [f.is_library for f in self.all_frames]
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mark_library = 0 < sum(library_frames) < len(library_frames)
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rows = []
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if not library_frames:
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classes = "traceback noframe-traceback"
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else:
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classes = "traceback"
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for msg, current in reversed(self.all_tracebacks):
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row_parts = []
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if msg is not None:
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row_parts.append(f'<li><div class="exc-divider">{msg}:</div>')
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for frame in current.stack:
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frame = t.cast(DebugFrameSummary, frame)
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info = f' title="{escape(frame.info)}"' if frame.info else ""
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row_parts.append(f"<li{info}>{frame.render_html(mark_library)}")
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rows.append("\n".join(row_parts))
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is_syntax_error = issubclass(self._te.exc_type, SyntaxError)
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if include_title:
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if is_syntax_error:
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title = "Syntax Error"
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else:
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title = "Traceback <em>(most recent call last)</em>:"
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else:
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title = ""
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exc_full = escape("".join(self._te.format_exception_only()))
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if is_syntax_error:
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description = f"<pre class=syntaxerror>{exc_full}</pre>"
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else:
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description = f"<blockquote>{exc_full}</blockquote>"
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return SUMMARY_HTML % {
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"classes": classes,
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"title": f"<h3>{title}</h3>",
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"frames": "\n".join(rows),
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"description": description,
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}
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def render_debugger_html(
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self, evalex: bool, secret: str, evalex_trusted: bool
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) -> str:
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exc_lines = list(self._te.format_exception_only())
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plaintext = "".join(self._te.format())
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return PAGE_HTML % {
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"evalex": "true" if evalex else "false",
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"evalex_trusted": "true" if evalex_trusted else "false",
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"console": "false",
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"title": exc_lines[0],
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"exception": escape("".join(exc_lines)),
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"exception_type": escape(self._te.exc_type.__name__),
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"summary": self.render_traceback_html(include_title=False),
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"plaintext": escape(plaintext),
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"plaintext_cs": re.sub("-{2,}", "-", plaintext),
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"secret": secret,
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}
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class DebugFrameSummary(traceback.FrameSummary):
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"""A :class:`traceback.FrameSummary` that can evaluate code in the
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frame's namespace.
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"""
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__slots__ = (
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"local_ns",
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"global_ns",
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"_cache_info",
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"_cache_is_library",
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"_cache_console",
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)
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def __init__(
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self,
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*,
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locals: t.Dict[str, t.Any],
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globals: t.Dict[str, t.Any],
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**kwargs: t.Any,
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) -> None:
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super().__init__(locals=None, **kwargs)
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self.local_ns = locals
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self.global_ns = globals
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@cached_property
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def info(self) -> t.Optional[str]:
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return self.local_ns.get("__traceback_info__")
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@cached_property
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def is_library(self) -> bool:
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return any(
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self.filename.startswith((path, os.path.realpath(path)))
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for path in sysconfig.get_paths().values()
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)
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@cached_property
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def console(self) -> Console:
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return Console(self.global_ns, self.local_ns)
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def eval(self, code: str) -> t.Any:
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return self.console.eval(code)
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def render_html(self, mark_library: bool) -> str:
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context = 5
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lines = linecache.getlines(self.filename)
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line_idx = self.lineno - 1 # type: ignore[operator]
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start_idx = max(0, line_idx - context)
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stop_idx = min(len(lines), line_idx + context + 1)
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rendered_lines = []
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def render_line(line: str, cls: str) -> None:
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|
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line = line.expandtabs().rstrip()
|
||
|
|
stripped_line = line.strip()
|
||
|
|
prefix = len(line) - len(stripped_line)
|
||
|
|
colno = getattr(self, "colno", 0)
|
||
|
|
end_colno = getattr(self, "end_colno", 0)
|
||
|
|
|
||
|
|
if cls == "current" and colno and end_colno:
|
||
|
|
arrow = (
|
||
|
|
f'\n<span class="ws">{" " * prefix}</span>'
|
||
|
|
f'{" " * (colno - prefix)}{"^" * (end_colno - colno)}'
|
||
|
|
)
|
||
|
|
else:
|
||
|
|
arrow = ""
|
||
|
|
|
||
|
|
rendered_lines.append(
|
||
|
|
f'<pre class="line {cls}"><span class="ws">{" " * prefix}</span>'
|
||
|
|
f"{escape(stripped_line) if stripped_line else ' '}"
|
||
|
|
f"{arrow if arrow else ''}</pre>"
|
||
|
|
)
|
||
|
|
|
||
|
|
if lines:
|
||
|
|
for line in lines[start_idx:line_idx]:
|
||
|
|
render_line(line, "before")
|
||
|
|
|
||
|
|
render_line(lines[line_idx], "current")
|
||
|
|
|
||
|
|
for line in lines[line_idx + 1 : stop_idx]:
|
||
|
|
render_line(line, "after")
|
||
|
|
|
||
|
|
return FRAME_HTML % {
|
||
|
|
"id": id(self),
|
||
|
|
"filename": escape(self.filename),
|
||
|
|
"lineno": self.lineno,
|
||
|
|
"function_name": escape(self.name),
|
||
|
|
"lines": "\n".join(rendered_lines),
|
||
|
|
"library": "library" if mark_library and self.is_library else "",
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
def render_console_html(secret: str, evalex_trusted: bool) -> str:
|
||
|
|
return CONSOLE_HTML % {
|
||
|
|
"evalex": "true",
|
||
|
|
"evalex_trusted": "true" if evalex_trusted else "false",
|
||
|
|
"console": "true",
|
||
|
|
"title": "Console",
|
||
|
|
"secret": secret,
|
||
|
|
}
|