Graham McIntire
b45993a8be
- Strip Mic-E telemetry from comments before database storage - Show sender callsign on map labels instead of object names for clarity - Object names still used for grouping to maintain trail organization - Add comprehensive tests for new encoding utilities Fixes display issues where weather balloon "X3234025" was shown instead of station "WA0YMH", and Mic-E telemetry bytes like "!w>`!" were appearing in comments.
378 lines
10 KiB
Elixir
378 lines
10 KiB
Elixir
defmodule Aprsme.EncodingUtils do
|
||
@moduledoc """
|
||
Encoding utilities for handling APRS packet data.
|
||
Provides functions for sanitizing strings, converting encodings,
|
||
and validating data.
|
||
"""
|
||
|
||
alias Aprs.Types.MicE
|
||
alias Aprsme.Encoding
|
||
|
||
@doc """
|
||
Sanitizes a binary to ensure it can be safely JSON encoded.
|
||
|
||
If the binary is valid UTF-8, returns it as-is.
|
||
If it contains invalid UTF-8 sequences, replaces them with the Unicode
|
||
replacement character (<28>) or removes them entirely.
|
||
|
||
## Examples
|
||
|
||
iex> Aprsme.EncodingUtils.sanitize_string("Hello World")
|
||
"Hello World"
|
||
|
||
iex> Aprsme.EncodingUtils.sanitize_string(<<72, 101, 108, 108, 111, 211, 87, 111, 114, 108, 100>>)
|
||
"HelloÓWorld"
|
||
"""
|
||
@spec sanitize_string(binary() | nil | any()) :: binary() | nil | any()
|
||
def sanitize_string(binary) when is_binary(binary) do
|
||
Encoding.sanitize_string(binary)
|
||
end
|
||
|
||
def sanitize_string(nil), do: nil
|
||
def sanitize_string(other), do: other
|
||
|
||
@doc """
|
||
Sanitizes a comment string by removing Mic-E telemetry and control characters.
|
||
|
||
## Examples
|
||
|
||
iex> Aprsme.EncodingUtils.sanitize_comment("!w>`!Clb=6.4m/s t=-66.7C")
|
||
"Clb=6.4m/s t=-66.7C"
|
||
|
||
iex> Aprsme.EncodingUtils.sanitize_comment("Normal comment")
|
||
"Normal comment"
|
||
"""
|
||
@spec sanitize_comment(binary() | nil | any()) :: binary() | nil | any()
|
||
def sanitize_comment(comment) when is_binary(comment) do
|
||
comment
|
||
|> Encoding.strip_mice_telemetry()
|
||
|> Encoding.sanitize_string()
|
||
end
|
||
|
||
def sanitize_comment(nil), do: nil
|
||
def sanitize_comment(other), do: other
|
||
|
||
@doc """
|
||
Converts various types to float with validation for safety.
|
||
|
||
## Examples
|
||
|
||
iex> Aprsme.EncodingUtils.to_float(1)
|
||
1.0
|
||
iex> Aprsme.EncodingUtils.to_float(1.5)
|
||
1.5
|
||
iex> Aprsme.EncodingUtils.to_float("2.3")
|
||
2.3
|
||
iex> Aprsme.EncodingUtils.to_float("bad")
|
||
nil
|
||
iex> Aprsme.EncodingUtils.to_float(nil)
|
||
nil
|
||
"""
|
||
@spec to_float(any()) :: float() | nil
|
||
def to_float(value) when is_float(value) do
|
||
# In Elixir, floats are always finite (no infinity or NaN)
|
||
value
|
||
end
|
||
|
||
def to_float(value) when is_integer(value) do
|
||
if value >= -9.0e15 and value <= 9.0e15 do
|
||
value * 1.0
|
||
end
|
||
end
|
||
|
||
def to_float(value) when is_binary(value) do
|
||
# Sanitize and use Gleam's safe conversion
|
||
sanitized = value |> sanitize_string() |> to_string()
|
||
|
||
case Encoding.to_float_safe(sanitized) do
|
||
{:ok, f} -> f
|
||
nil -> nil
|
||
end
|
||
end
|
||
|
||
def to_float(%Decimal{} = value) do
|
||
Decimal.to_float(value)
|
||
end
|
||
|
||
def to_float(_), do: nil
|
||
|
||
@doc """
|
||
Converts various types to Decimal for database storage.
|
||
|
||
## Examples
|
||
|
||
iex> is_struct(Aprsme.EncodingUtils.to_decimal(1), Decimal)
|
||
true
|
||
iex> is_struct(Aprsme.EncodingUtils.to_decimal(1.5), Decimal)
|
||
true
|
||
iex> is_struct(Aprsme.EncodingUtils.to_decimal("2.3"), Decimal)
|
||
true
|
||
iex> Aprsme.EncodingUtils.to_decimal("bad")
|
||
nil
|
||
iex> Aprsme.EncodingUtils.to_decimal(nil)
|
||
nil
|
||
"""
|
||
@spec to_decimal(any()) :: Decimal.t() | nil
|
||
def to_decimal(%Decimal{} = d), do: d
|
||
def to_decimal(f) when is_float(f), do: Decimal.from_float(f)
|
||
def to_decimal(i) when is_integer(i), do: Decimal.new(i)
|
||
|
||
def to_decimal(s) when is_binary(s) do
|
||
case Decimal.parse(s) do
|
||
{d, _} ->
|
||
d
|
||
|
||
:error ->
|
||
case Float.parse(s) do
|
||
{f, _} -> Decimal.from_float(f)
|
||
:error -> nil
|
||
end
|
||
end
|
||
end
|
||
|
||
def to_decimal(_), do: nil
|
||
|
||
@doc """
|
||
Sanitizes all string fields in packet data before database storage.
|
||
|
||
## Examples
|
||
|
||
iex> Aprsme.EncodingUtils.sanitize_packet_strings(["abc", <<255>>])
|
||
["abc", "ÿ"]
|
||
iex> Aprsme.EncodingUtils.sanitize_packet_strings(%{"foo" => <<0, 65, 66, 67>>})
|
||
%{"foo" => "ABC"}
|
||
iex> Aprsme.EncodingUtils.sanitize_packet_strings(nil)
|
||
nil
|
||
"""
|
||
@spec sanitize_packet_strings(any()) :: any()
|
||
def sanitize_packet_strings(%DateTime{} = dt), do: dt
|
||
def sanitize_packet_strings(%NaiveDateTime{} = ndt), do: ndt
|
||
def sanitize_packet_strings(%_struct{} = struct), do: struct |> Map.from_struct() |> sanitize_packet_strings()
|
||
def sanitize_packet_strings(list) when is_list(list), do: Enum.map(list, &sanitize_packet_strings/1)
|
||
|
||
def sanitize_packet_strings(map) when is_map(map) do
|
||
Enum.reduce(map, %{}, fn {key, value}, acc ->
|
||
Map.put(acc, key, sanitize_packet_strings(value))
|
||
end)
|
||
end
|
||
|
||
def sanitize_packet_strings(binary) when is_binary(binary) do
|
||
s = sanitize_string(binary)
|
||
if is_binary(s), do: s, else: ""
|
||
end
|
||
|
||
def sanitize_packet_strings(other), do: other
|
||
|
||
@doc """
|
||
Normalizes data_type field to ensure it's always a string.
|
||
|
||
## Examples
|
||
|
||
iex> Aprsme.EncodingUtils.normalize_data_type(%{data_type: :weather})
|
||
%{data_type: "weather"}
|
||
iex> Aprsme.EncodingUtils.normalize_data_type(%{"data_type" => :foo})
|
||
%{"data_type" => "foo"}
|
||
iex> Aprsme.EncodingUtils.normalize_data_type(%{data_type: "bar"})
|
||
%{data_type: "bar"}
|
||
iex> Aprsme.EncodingUtils.normalize_data_type(%{"data_type" => "baz"})
|
||
%{"data_type" => "baz"}
|
||
iex> Aprsme.EncodingUtils.normalize_data_type(%{foo: 1})
|
||
%{foo: 1}
|
||
"""
|
||
@spec normalize_data_type(map()) :: map()
|
||
def normalize_data_type(%{data_type: data_type} = attrs) when is_atom(data_type) do
|
||
%{attrs | data_type: to_string(data_type)}
|
||
end
|
||
|
||
def normalize_data_type(%{"data_type" => data_type} = attrs) when is_atom(data_type) do
|
||
%{attrs | "data_type" => to_string(data_type)}
|
||
end
|
||
|
||
def normalize_data_type(attrs) when is_map(attrs) do
|
||
case {Map.has_key?(attrs, :data_type), Map.get(attrs, :data_type)} do
|
||
{true, data_type} when is_atom(data_type) ->
|
||
%{attrs | data_type: to_string(data_type)}
|
||
|
||
_ ->
|
||
attrs
|
||
end
|
||
end
|
||
|
||
def normalize_data_type(attrs), do: attrs
|
||
|
||
@doc """
|
||
List of weather-related fields used for packet classification.
|
||
|
||
## Examples
|
||
|
||
iex> Aprsme.EncodingUtils.weather_fields() |> Enum.member?(:temperature)
|
||
true
|
||
iex> :foo in Aprsme.EncodingUtils.weather_fields()
|
||
false
|
||
"""
|
||
@spec weather_fields() :: [atom()]
|
||
def weather_fields do
|
||
[
|
||
:temperature,
|
||
:humidity,
|
||
:wind_speed,
|
||
:wind_direction,
|
||
:wind_gust,
|
||
:pressure,
|
||
:rain_1h,
|
||
:rain_24h,
|
||
:rain_since_midnight,
|
||
:snow
|
||
]
|
||
end
|
||
|
||
@doc """
|
||
Sanitizes all string fields in an APRS packet to ensure safe JSON encoding.
|
||
|
||
## Examples
|
||
|
||
iex> result = Aprsme.EncodingUtils.sanitize_packet(%{"comment" => <<0, 65, 66, 67>>, "data_extended" => %{"comment" => <<0, 68, 69, 70>>}})
|
||
iex> result["comment"] == "ABC"
|
||
true
|
||
iex> result["data_extended"]["comment"] == "DEF"
|
||
true
|
||
"""
|
||
@spec sanitize_packet(struct() | map()) :: struct() | map()
|
||
def sanitize_packet(%Aprsme.Packet{} = packet) do
|
||
sanitized_data =
|
||
case packet.data do
|
||
nil -> nil
|
||
data when is_map(data) -> sanitize_packet_strings(data)
|
||
other -> other
|
||
end
|
||
|
||
%{
|
||
packet
|
||
| data: sanitized_data,
|
||
data_extended: sanitize_data_extended(packet.data_extended)
|
||
}
|
||
end
|
||
|
||
def sanitize_packet(packet) when is_map(packet) do
|
||
packet
|
||
|> sanitize_string_fields()
|
||
|> sanitize_nested_map(:data, &sanitize_packet_strings/1)
|
||
|> sanitize_nested_map(:data_extended, &sanitize_data_extended/1)
|
||
end
|
||
|
||
@string_fields [
|
||
:comment,
|
||
:path,
|
||
:raw_packet,
|
||
:destination,
|
||
:sender,
|
||
:base_callsign,
|
||
:ssid,
|
||
:manufacturer,
|
||
:equipment_type,
|
||
:message_text,
|
||
:addressee,
|
||
:symbol_code,
|
||
:symbol_table_id,
|
||
:dao,
|
||
:timestamp,
|
||
:device_identifier
|
||
]
|
||
|
||
defp sanitize_string_fields(packet) do
|
||
Enum.reduce(@string_fields, packet, fn field, acc ->
|
||
string_key = to_string(field)
|
||
# Use sanitize_comment for comment field to strip Mic-E telemetry
|
||
sanitizer = if field == :comment, do: &sanitize_comment/1, else: &sanitize_string/1
|
||
|
||
cond do
|
||
Map.has_key?(acc, field) ->
|
||
Map.update(acc, field, nil, sanitizer)
|
||
|
||
Map.has_key?(acc, string_key) ->
|
||
Map.update(acc, string_key, nil, sanitizer)
|
||
|
||
true ->
|
||
acc
|
||
end
|
||
end)
|
||
end
|
||
|
||
defp sanitize_nested_map(packet, key, sanitizer) do
|
||
string_key = to_string(key)
|
||
|
||
cond do
|
||
Map.has_key?(packet, key) ->
|
||
Map.update(packet, key, nil, &if(is_nil(&1), do: nil, else: sanitizer.(&1)))
|
||
|
||
Map.has_key?(packet, string_key) ->
|
||
Map.update(packet, string_key, nil, &if(is_nil(&1), do: nil, else: sanitizer.(&1)))
|
||
|
||
true ->
|
||
packet
|
||
end
|
||
end
|
||
|
||
@doc """
|
||
Sanitizes string fields in the data_extended structure.
|
||
|
||
## Examples
|
||
|
||
iex> Aprsme.EncodingUtils.sanitize_data_extended(%{"comment" => <<0, 65, 66, 67>>})
|
||
%{"comment" => "ABC"}
|
||
iex> Aprsme.EncodingUtils.sanitize_data_extended(nil)
|
||
nil
|
||
"""
|
||
@spec sanitize_data_extended(nil | map() | MicE.t() | any()) :: nil | map() | MicE.t() | any()
|
||
def sanitize_data_extended(nil), do: nil
|
||
|
||
def sanitize_data_extended(%{comment: comment} = data_extended) when is_map(data_extended) do
|
||
%{data_extended | comment: sanitize_string(comment)}
|
||
end
|
||
|
||
def sanitize_data_extended(%MicE{message: message} = mic_e) do
|
||
%{mic_e | message: sanitize_string(message)}
|
||
end
|
||
|
||
def sanitize_data_extended(data_extended) when is_map(data_extended) and not is_struct(data_extended) do
|
||
# Handle generic maps by sanitizing all string values
|
||
Enum.reduce(data_extended, %{}, fn {key, value}, acc ->
|
||
sanitized_value = sanitize_map_value(value)
|
||
Map.put(acc, key, sanitized_value)
|
||
end)
|
||
end
|
||
|
||
def sanitize_data_extended(data_extended), do: data_extended
|
||
|
||
@spec sanitize_map_value(any()) :: any()
|
||
defp sanitize_map_value(val) when is_binary(val), do: sanitize_string(val)
|
||
defp sanitize_map_value(val), do: val
|
||
|
||
@doc """
|
||
Converts a binary to a hex string representation for debugging.
|
||
|
||
## Examples
|
||
|
||
iex> Aprsme.EncodingUtils.to_hex(<<72, 101, 108, 108, 111>>)
|
||
"48656C6C6F"
|
||
"""
|
||
@spec to_hex(binary()) :: String.t()
|
||
def to_hex(binary) when is_binary(binary) do
|
||
Encoding.to_hex(binary)
|
||
end
|
||
|
||
@doc """
|
||
Returns information about a binary's encoding validity.
|
||
|
||
## Examples
|
||
|
||
iex> Aprsme.EncodingUtils.encoding_info("Hello")
|
||
%{valid_utf8: true, byte_count: 5, char_count: 5, invalid_at: nil}
|
||
iex> Aprsme.EncodingUtils.encoding_info(<<72, 101, 211, 108, 111>>)
|
||
%{valid_utf8: false, byte_count: 5, char_count: nil, invalid_at: 2}
|
||
"""
|
||
@spec encoding_info(binary()) :: map()
|
||
def encoding_info(binary) when is_binary(binary) do
|
||
Encoding.encoding_info(binary)
|
||
end
|
||
end
|