Handle the correct exception when formatting extremely high amounts of bytes

Found in production. Yes really. Due to some borked LXC integration, my
snikket host reports

```
MemTotal:       9007199254740991 kB
MemFree:        9007199254690591 kB
MemAvailable:   9007199254690591 kB
```

That is more than 1024 TiB, so it tries to go further up in the scale,
which then causes a Guru Meditation because of the uncaught IndexError.

Dockerfile

@@ -1,7 +1,13 @@
-FROM debian:buster-slim
+FROM debian:bullseye-slim AS build
 
-ARG BUILD_SERIES=dev
-ARG BUILD_ID=0
+RUN set -eu; \
+    export DEBIAN_FRONTEND=noninteractive ; \
+    apt-get update ; \
+    apt-get install -y --no-install-recommends \
+        python3 python3-pip python3-setuptools python3-wheel \
+        libpython3-dev \
+        make build-essential \
+        netcat;
 
 COPY requirements.txt /opt/snikket-web-portal/requirements.txt
 COPY build-requirements.txt /opt/snikket-web-portal/build-requirements.txt
@@ -11,32 +17,41 @@ COPY babel.cfg /opt/snikket-web-portal/babel.cfg
 
 WORKDIR /opt/snikket-web-portal
 
-RUN set -eu; \
-    export DEBIAN_FRONTEND=noninteractive ; \
-    apt-get update ; \
-    apt-get install -y --no-install-recommends \
-        python3 python3-pip python3-setuptools python3-wheel \
-        libpython3-dev \
-        make build-essential \
-        netcat \
-        ; \
-    pip3 install -r requirements.txt; \
+RUN pip3 install -r requirements.txt; \
     pip3 install -r build-requirements.txt; \
-    make; \
-    pip3 uninstall -yr build-requirements.txt; \
-    apt-get remove -y build-essential make libpython3-dev; \
-    apt-get autoremove -y; \
-    pip3 install hypercorn; \
-    rm -rf /root/.cache; \
-    apt-get clean ; rm -rf /var/lib/apt/lists
+    make;
+
+
+FROM debian:bullseye-slim
+
+ARG BUILD_SERIES=dev
+ARG BUILD_ID=0
 
 COPY docker/env.py /etc/snikket-web-portal/env.py
+
 ENV SNIKKET_WEB_PYENV=/etc/snikket-web-portal/env.py
 
 ENV SNIKKET_WEB_PROSODY_ENDPOINT=http://127.0.0.1:5280/
 
 HEALTHCHECK CMD nc -zv ${SNIKKET_TWEAK_PORTAL_INTERNAL_HTTP_INTERFACE:-127.0.0.1} ${SNIKKET_TWEAK_PORTAL_INTERNAL_HTTP_PORT:-5765}
 
+RUN set -eu; \
+    export DEBIAN_FRONTEND=noninteractive ; \
+    apt-get update ; \
+    apt-get install -y --no-install-recommends \
+        python3 python3-pip python3-setuptools python3-wheel; \
+    apt-get clean ; rm -rf /var/lib/apt/lists; \
+    pip3 install hypercorn; \
+    rm -rf /root/.cache;
+
+WORKDIR /opt/snikket-web-portal
+
+COPY requirements.txt /opt/snikket-web-portal/requirements.txt
+RUN pip3 install -r requirements.txt; rm -rf /root/.cache;
+
+COPY --from=build /opt/snikket-web-portal/snikket_web/ /opt/snikket-web-portal/snikket_web
+COPY babel.cfg /opt/snikket-web-portal/babel.cfg
+
 RUN echo "$BUILD_SERIES $BUILD_ID" > /opt/snikket-web-portal/.app_version
 
 ADD docker/entrypoint.sh /entrypoint.sh

snikket_web/admin.py

@@ -63,9 +63,6 @@ async def users() -> str:
     )
 
 
-_LIMITED_ROLE_NAME = _("Limited")
-
-
 class EditUserForm(BaseForm):
     localpart = wtforms.StringField(
         _l("Login name"),
@@ -78,9 +75,7 @@ class EditUserForm(BaseForm):
     role = wtforms.RadioField(
         _l("Access Level"),
         choices=[
-            # NOTE: enable this only after something has been done which
-            # actually enforces the described restrictions :).
-            # ("prosody:restricted", _LIMITED_ROLE_NAME),
+            ("prosody:restricted", _("Limited")),
             ("prosody:normal", _l("Normal user")),
             ("prosody:admin", _l("Administrator")),
         ],

snikket_web/infra.py

@@ -53,11 +53,14 @@ def circle_name(c: typing.Any) -> str:
 
 
 def format_bytes(n: float) -> str:
-    scale = math.floor(math.log(n, 1024))
+    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:
+    except IndexError:
         unit = "TiB"
         factor = 1024**4
     if factor > 1:

snikket_web/translations/id/LC_MESSAGES/messages.po

@@ -6,18 +6,18 @@
 msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
-"Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
+"Report-Msgid-Bugs-To: translations@snikket.org\n"
 "POT-Creation-Date: 2021-06-18 16:05+0200\n"
-"PO-Revision-Date: 2021-06-21 23:01+0000\n"
+"PO-Revision-Date: 2021-12-12 07:00+0000\n"
 "Last-Translator: uira <inboxriau@andriana.id>\n"
-"Language-Team: Indonesian <https://i18n.sotecware.net/projects/snikket/"
+"Language-Team: Indonesian <http://i18n.sotecware.net/projects/snikket/"
 "web-portal/id/>\n"
 "Language: id\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=1; plural=0;\n"
-"X-Generator: Weblate 4.5.1\n"
+"X-Generator: Weblate 4.8.1\n"
 "Generated-By: Babel 2.9.0\n"
 
 #: snikket_web/admin.py:66
@@ -980,7 +980,7 @@ msgstr "Perangkat terhubung"
 
 #: snikket_web/templates/admin_system.html:82
 msgid "Broadcast message"
-msgstr "Siarkan pesan"
+msgstr "Sebarkan pesan"
 
 #: snikket_web/templates/admin_system.html:84
 msgid ""

snikket_web/xmpputil.py

@@ -207,7 +207,7 @@ def make_avatar_metadata_set_request(
         item,
         "metadata", xmlns=NS_USER_AVATAR_METADATA)
 
-    attr: typing.MutableMapping[str, str] = {
+    attr: typing.Dict[str, str] = {
         "id": id_,
         "bytes": str(size),
         "type": mimetype,
@@ -217,7 +217,12 @@ def make_avatar_metadata_set_request(
     if height is not None:
         attr["height"] = str(height)
 
-    ET.SubElement(metadata_wrap, "info", xmlns=NS_USER_AVATAR_METADATA, **attr)
+    ET.SubElement(
+        metadata_wrap,
+        "info",
+        xmlns=NS_USER_AVATAR_METADATA,
+        **attr,  # type: ignore
+    )
     return req