From 5bf22fc7e3c392c8bd44315ca2d06d7dca7d084e Mon Sep 17 00:00:00 2001 From: sotech117 Date: Thu, 31 Jul 2025 17:27:24 -0400 Subject: add code for analysis of data --- .../python3.8/site-packages/flask/debughelpers.py | 178 +++++++++++++++++++++ 1 file changed, 178 insertions(+) create mode 100644 venv/lib/python3.8/site-packages/flask/debughelpers.py (limited to 'venv/lib/python3.8/site-packages/flask/debughelpers.py') diff --git a/venv/lib/python3.8/site-packages/flask/debughelpers.py b/venv/lib/python3.8/site-packages/flask/debughelpers.py new file mode 100644 index 0000000..2c8c4c4 --- /dev/null +++ b/venv/lib/python3.8/site-packages/flask/debughelpers.py @@ -0,0 +1,178 @@ +from __future__ import annotations + +import typing as t + +from jinja2.loaders import BaseLoader +from werkzeug.routing import RequestRedirect + +from .blueprints import Blueprint +from .globals import request_ctx +from .sansio.app import App + +if t.TYPE_CHECKING: + from .sansio.scaffold import Scaffold + from .wrappers import Request + + +class UnexpectedUnicodeError(AssertionError, UnicodeError): + """Raised in places where we want some better error reporting for + unexpected unicode or binary data. + """ + + +class DebugFilesKeyError(KeyError, AssertionError): + """Raised from request.files during debugging. The idea is that it can + provide a better error message than just a generic KeyError/BadRequest. + """ + + def __init__(self, request: Request, key: str) -> None: + form_matches = request.form.getlist(key) + buf = [ + f"You tried to access the file {key!r} in the request.files" + " dictionary but it does not exist. The mimetype for the" + f" request is {request.mimetype!r} instead of" + " 'multipart/form-data' which means that no file contents" + " were transmitted. To fix this error you should provide" + ' enctype="multipart/form-data" in your form.' + ] + if form_matches: + names = ", ".join(repr(x) for x in form_matches) + buf.append( + "\n\nThe browser instead transmitted some file names. " + f"This was submitted: {names}" + ) + self.msg = "".join(buf) + + def __str__(self) -> str: + return self.msg + + +class FormDataRoutingRedirect(AssertionError): + """This exception is raised in debug mode if a routing redirect + would cause the browser to drop the method or body. This happens + when method is not GET, HEAD or OPTIONS and the status code is not + 307 or 308. + """ + + def __init__(self, request: Request) -> None: + exc = request.routing_exception + assert isinstance(exc, RequestRedirect) + buf = [ + f"A request was sent to '{request.url}', but routing issued" + f" a redirect to the canonical URL '{exc.new_url}'." + ] + + if f"{request.base_url}/" == exc.new_url.partition("?")[0]: + buf.append( + " The URL was defined with a trailing slash. Flask" + " will redirect to the URL with a trailing slash if it" + " was accessed without one." + ) + + buf.append( + " Send requests to the canonical URL, or use 307 or 308 for" + " routing redirects. Otherwise, browsers will drop form" + " data.\n\n" + "This exception is only raised in debug mode." + ) + super().__init__("".join(buf)) + + +def attach_enctype_error_multidict(request: Request) -> None: + """Patch ``request.files.__getitem__`` to raise a descriptive error + about ``enctype=multipart/form-data``. + + :param request: The request to patch. + :meta private: + """ + oldcls = request.files.__class__ + + class newcls(oldcls): # type: ignore[valid-type, misc] + def __getitem__(self, key: str) -> t.Any: + try: + return super().__getitem__(key) + except KeyError as e: + if key not in request.form: + raise + + raise DebugFilesKeyError(request, key).with_traceback( + e.__traceback__ + ) from None + + newcls.__name__ = oldcls.__name__ + newcls.__module__ = oldcls.__module__ + request.files.__class__ = newcls + + +def _dump_loader_info(loader: BaseLoader) -> t.Iterator[str]: + yield f"class: {type(loader).__module__}.{type(loader).__name__}" + for key, value in sorted(loader.__dict__.items()): + if key.startswith("_"): + continue + if isinstance(value, (tuple, list)): + if not all(isinstance(x, str) for x in value): + continue + yield f"{key}:" + for item in value: + yield f" - {item}" + continue + elif not isinstance(value, (str, int, float, bool)): + continue + yield f"{key}: {value!r}" + + +def explain_template_loading_attempts( + app: App, + template: str, + attempts: list[ + tuple[ + BaseLoader, + Scaffold, + tuple[str, str | None, t.Callable[[], bool] | None] | None, + ] + ], +) -> None: + """This should help developers understand what failed""" + info = [f"Locating template {template!r}:"] + total_found = 0 + blueprint = None + if request_ctx and request_ctx.request.blueprint is not None: + blueprint = request_ctx.request.blueprint + + for idx, (loader, srcobj, triple) in enumerate(attempts): + if isinstance(srcobj, App): + src_info = f"application {srcobj.import_name!r}" + elif isinstance(srcobj, Blueprint): + src_info = f"blueprint {srcobj.name!r} ({srcobj.import_name})" + else: + src_info = repr(srcobj) + + info.append(f"{idx + 1:5}: trying loader of {src_info}") + + for line in _dump_loader_info(loader): + info.append(f" {line}") + + if triple is None: + detail = "no match" + else: + detail = f"found ({triple[1] or ''!r})" + total_found += 1 + info.append(f" -> {detail}") + + seems_fishy = False + if total_found == 0: + info.append("Error: the template could not be found.") + seems_fishy = True + elif total_found > 1: + info.append("Warning: multiple loaders returned a match for the template.") + seems_fishy = True + + if blueprint is not None and seems_fishy: + info.append( + " The template was looked up from an endpoint that belongs" + f" to the blueprint {blueprint!r}." + ) + info.append(" Maybe you did not place a template in the right folder?") + info.append(" See https://flask.palletsprojects.com/blueprints/#templates") + + app.logger.info("\n".join(info)) -- cgit v1.2.3-70-g09d2