Use actual ISO8601 timestamps for masto API (#425)

Some users post posts with spoofed timestamp, and some clients will have issues with certain dates. Tusky for example crashes if the date is any sooner than 1 BCE (“year zero” in the representation).

I limited the range of what is considered a valid date to be somewhere between the years 1583 and 9999 (inclusive).

The numbers have been chosen because:

- ISO 8601 only allows years before 1583 with “mutual agreement”
- Years after 9999 could cause issues with certain clients as well

Co-authored-by: Charlotte 🦝 Delenk <lotte@chir.rs>
Reviewed-on: https://akkoma.dev/AkkomaGang/akkoma/pulls/425
Co-authored-by: darkkirb <lotte@chir.rs>
Co-committed-by: darkkirb <lotte@chir.rs>
This commit is contained in:
darkkirb 2023-01-09 22:12:28 +00:00 committed by floatingghost
parent 0d56adc16b
commit a8cd859ef9
2 changed files with 22 additions and 7 deletions

View file

@ -328,20 +328,27 @@ def date_to_asctime(date) do
end
def to_masto_date(%NaiveDateTime{} = date) do
date
|> NaiveDateTime.to_iso8601()
|> String.replace(~r/(\.\d+)?$/, ".000Z", global: false)
# NOTE: Elixirs ISO 8601 format is a superset of the real standard
# It supports negative years for example.
# ISO8601 only supports years before 1583 with mutual agreement
if date.year < 1583 do
"1970-01-01T00:00:00Z"
else
date
|> NaiveDateTime.to_iso8601()
|> String.replace(~r/(\.\d+)?$/, ".000Z", global: false)
end
end
def to_masto_date(date) when is_binary(date) do
with {:ok, date} <- NaiveDateTime.from_iso8601(date) do
to_masto_date(date)
else
_ -> ""
_ -> "1970-01-01T00:00:00Z"
end
end
def to_masto_date(_), do: ""
def to_masto_date(_), do: "1970-01-01T00:00:00Z"
defp shortname(name) do
with max_length when max_length > 0 <-

View file

@ -495,8 +495,16 @@ test "removes microseconds from date (String)" do
assert Utils.to_masto_date("2015-01-23T23:50:07.123Z") == "2015-01-23T23:50:07.000Z"
end
test "returns empty string when date invalid" do
assert Utils.to_masto_date("2015-01?23T23:50:07.123Z") == ""
test "returns unix epoch when date invalid" do
assert Utils.to_masto_date("2015-01?23T23:50:07.123Z") == "1970-01-01T00:00:00Z"
end
test "returns unix epoch when date is before the introduction of the Gregorian Calendar" do
assert Utils.to_masto_date("0621-01-01T00:00:00Z") == "1970-01-01T00:00:00Z"
end
test "returns unix epoch when date is BCE" do
assert Utils.to_masto_date("-0420-01-01T00:00:00Z") == "1970-01-01T00:00:00Z"
end
end