liberapay.com/error.spt

import os.path
import sys

from pando.http import status_strings
from pando.utils import utcnow

from liberapay.exceptions import LazyResponse
from liberapay.i18n.base import HTTP_ERRORS

python_dir = f"python{sys.version_info.major}.{sys.version_info.minor}"
project_root = website.project_root.rstrip(os.path.sep) + os.path.sep

def get_short_traceback(exception):
    tb = getattr(exception, '__traceback__', None)
    if tb:
        r = []
        for i in range(25):
            frame = tb.tb_frame
            filepath = frame.f_code.co_filename.split(os.path.sep)
            try:
                i = filepath.index(python_dir)
            except Exception:
                filepath = os.path.sep.join(filepath)
                if filepath.startswith(project_root):
                    filepath = filepath.removeprefix(project_root)
            else:
                if filepath[i+1] == 'site-packages':
                    i += 1
                filepath = os.path.sep.join(filepath[i+1:])
            r.append(f'{filepath}:{tb.tb_lineno} ({frame.f_code.co_name})')
            tb = tb.tb_next
            if tb is None:
                break
        return '\n  ' + '\n  '.join(r)
    else:
        return ' none'

def render_cookies(request):
    return '; '.join(
        f"{name}=[{len(value)} bytes]" for name, value in request.cookies.items()
    ) or 'none'

[----------------------------------------]

sentry_ident = state.get('sentry_ident')
code = response.code
msg = _(HTTP_ERRORS[code]) if code in HTTP_ERRORS else status_strings.get(code, '')
if not msg:
    website.tell_sentry(Warning(f"missing error message for HTTP code {code}"))

if isinstance(response, LazyResponse):
    response.render_body(state)
err = response.text
if code == 500 and not err:
    err = _("Looks like you've found a bug! Sorry for the inconvenience, we'll get it fixed ASAP!")

referer = request.headers.get(b'Referer')
user_agent = request.headers.get(b'User-Agent')

[----------------------------------------] text/html
% extends "templates/layouts/base.html"

% set title = '' if response.html_template is defined else msg

% block content
    % if response.html_template is defined
        % include response.html_template
    % else
        % if code >= 400 and code <= 499
            % if code == 404
                <p>{{ _(
                    "The requested page could not be found. Please "
                    "{link_open}contact us{link_close} if you need assistance.",
                    link_open='<a href="https://liberapay.com/about/contact">'|safe,
                    link_close='</a>'|safe,
                ) }}</p>
            % else
                <p>{{ _(
                    "Your request has been rejected by our software. Please "
                    "{link_open}contact us{link_close} if you need assistance.",
                    link_open='<a href="https://liberapay.com/about/contact">'|safe,
                    link_close='</a>'|safe,
                ) }}</p>
            % endif
        % endif

        % if err
            % if '\n' in err
                <pre>{{ err }}</pre>
            % else
                <p>{{ _("Error message:") }}</p>
                <div class="alert alert-danger">{{ err }}</div>
            % endif
        % endif

        % if sentry_ident
            <p>{{ _(
                "The details of this error have been recorded. If you decide to contact us, "
                "please include the following error identification code in your message: {0}.",
                '<code>%s</code>'|safe % sentry_ident
            ) }}</p>
        % else
            <br>
            <p>{{ _("If you decide to contact us please include the following debugging information in your message:") }}</p>
            <pre>URL: {{ website.canonical_scheme }}://{{ request.hostname }}{{ request.line.uri.decoded }}{{ '\n'
               }}Method: {{ request.method }}{{ '\n'
               }}Referer: {{ repr(referer) }}{{ '\n'
               }}User-Agent: {{ repr(user_agent) }}{{ '\n'
               }}Cookies: {{ render_cookies(request) }}{{ '\n'
               }}IP address: {{ request.source }} ({{ request.source_country }}){{ '\n'
               }}Time: {{ utcnow() }}{{ '\n'
               }}Response code: {{ code }}{{ '\n'
               }}Response message: {{ repr(err) }}{{ '\n'
               }}User: {{ user }}{{ '\n'
               }}Locale: {{ locale }}{{ '\n'
               }}Website version: {{ website.version }}{{ '\n'
               }}Traceback:{{
                   get_short_traceback(response.__cause__ or response)
               }}</pre>
        % endif
    % endif
% endblock
[----------------------------------------] application/json via json_dump
{
    "error_code": code,
    "error_id": sentry_ident,
    "error_message_long": err,
    "error_message_short": msg,
    "html_template": getattr(response, 'html_template', None),
}
[----------------------------------------] text/plain
{{err or msg}}