Files
snikket-web-portal/snikket_web/infra.py
Jonas Schäfer b4e6ee8943 Fix formatting of zero bytes
Previously, that would raise a ValueError (math domain error), because
log(0) is undefined.
2022-01-10 17:31:50 +01:00

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import base64
import itertools
import math
import secrets
import typing
import quart.flask_patch # noqa:F401
from quart import (
current_app,
request,
)
import flask_babel
import flask_wtf
from flask_babel import _
from . import prosodyclient
client = prosodyclient.ProsodyClient()
client.default_login_redirect = "main.login"
babel = flask_babel.Babel()
BYTE_UNIT_SCALE_MAP = [
"B",
"kiB",
"MiB",
"GiB",
"TiB",
]
@babel.localeselector # type:ignore
def selected_locale() -> str:
selected = request.accept_languages.best_match(
current_app.config['LANGUAGES']
) or current_app.config['LANGUAGES'][0]
return selected
def flatten(a: typing.Iterable, levels: int = 1) -> typing.Iterable:
for i in range(levels):
a = itertools.chain(*a)
return a
def circle_name(c: typing.Any) -> str:
if c.id_ == "default" and c.name == "default":
return _("Main")
return c.name
def format_bytes(n: float) -> str:
try:
scale = max(math.floor(math.log(n, 1024)), 0)
except ValueError:
scale = 0
try:
unit = BYTE_UNIT_SCALE_MAP[scale]
factor = 1024**scale
except ValueError:
unit = "TiB"
factor = 1024**4
if factor > 1:
return "{:.1f}{}".format(n / factor, unit)
return "{}{}".format(n, unit)
def init_templating(app: quart.Quart) -> None:
app.template_filter("repr")(repr)
app.template_filter("format_datetime")(flask_babel.format_datetime)
app.template_filter("format_date")(flask_babel.format_date)
app.template_filter("format_time")(flask_babel.format_time)
app.template_filter("format_timedelta")(flask_babel.format_timedelta)
app.template_filter("format_percent")(flask_babel.format_percent)
app.template_filter("format_bytes")(format_bytes)
app.template_filter("flatten")(flatten)
app.template_filter("circle_name")(circle_name)
def generate_error_id() -> str:
return base64.b32encode(secrets.token_bytes(8)).decode(
"ascii"
).rstrip("=")
class BaseForm(flask_wtf.FlaskForm): # type:ignore
def __init__(self, *args: typing.Any, **kwargs: typing.Any):
meta = kwargs["meta"] = dict(kwargs.get("meta", {}))
if "locales" not in meta:
locale = flask_babel.get_locale()
if locale:
meta["locales"] = [str(locale)]
super().__init__(*args, **kwargs)