ex_json_schema

defmodule ExJsonSchema.Validator.Format do
  @moduledoc """
  `ExJsonSchema.Validator` implementation for `"format"` attributes.
  See:
  https://tools.ietf.org/html/draft-fge-json-schema-validation-00#section-7
  https://tools.ietf.org/html/draft-wright-json-schema-validation-01#section-8
  https://tools.ietf.org/html/draft-handrews-json-schema-validation-01#section-7
  """
  alias ExJsonSchema.Schema.Root
  alias ExJsonSchema.Validator.Error
  @behaviour ExJsonSchema.Validator
  @impl ExJsonSchema.Validator
  def validate(root, _, {"format", format}, data, _) do
    do_validate(root, format, data)
  end
  def validate(_, _, _, _, _) do
    []
  end
  defp do_validate(_, _, data) when not is_bitstring(data) do
    []
  end
  defp do_validate(_, "date" = format, data) do
    case Date.from_iso8601(data) do
      {:ok, %Date{}} -> []
      _ -> [%Error{error: %Error.Format{expected: format}}]
    end
  end
  defp do_validate(_, "date-time" = format, data) do
    data
    |> String.upcase()
    |> NaiveDateTime.from_iso8601()
    |> case do
      {:ok, %NaiveDateTime{}} -> []
      _ -> [%Error{error: %Error.Format{expected: format}}]
    end
  end
  defp do_validate(_, format, data)
       when format in [
              "email",
              "idn-email",
              "idn-hostname",
              "hostname",
              "ipv4",
              "ipv6",
              "iri-reference",
              "iri",
              "json-pointer",
              "relative-json-pointer",
              "time",
              "uri-reference",
              "uri",
              "uri-template"
            ] do
    case Regex.match?(formats(format), data) do
      true -> []
      false -> [%Error{error: %Error.Format{expected: format}}]
    end
  end
  defp do_validate(_, "regex", data) do
    case Regex.compile(data) do
      {:ok, _} -> []
      {:error, _} -> [%Error{error: %Error.Format{expected: "regex"}}]
    end
  end
  defp do_validate(%Root{custom_format_validator: nil}, format, data) do
    case Application.fetch_env(:ex_json_schema, :custom_format_validator) do
      :error -> []
      {:ok, validator = {_mod, _fun}} -> validate_with_custom_validator(validator, format, data)
    end
  end
  defp do_validate(%Root{custom_format_validator: validator = {_mod, _fun}}, format, data) do
    validate_with_custom_validator(validator, format, data)
  end
  defp do_validate(%Root{custom_format_validator: validator}, format, data) when is_function(validator) do
    validate_with_custom_validator(validator, format, data)
  end
  defp validate_with_custom_validator(validator, format, data) do
    result =
      case validator do
        {mod, fun} -> apply(mod, fun, [format, data])
        fun when is_function(fun, 2) -> fun.(format, data)
      end
    case result do
      true -> []
      false -> [%Error{error: %Error.Format{expected: format}}]
      {:error, error} -> [%Error{error: error}]
    end
  end
  defp formats(format) do
    %{
      "email" => ~r<^[\w!#$%&'*+/=?`{|}~^-]+(?:\.[\w!#$%&'*+/=?`{|}~^-]+)*@(?:[A-Z0-9-]+\.)+[a-z]{2,}$>i,
      "hostname" => ~r/^[\pL0-9](?:[\pL0-9-]{0,61}[\pL0-9])?(?:\.[\pL0-9](?:[-0-9\pL]{0,61}[0-9\pL])?)*$/iu,
      "idn-email" => ~r<^[\w!#$%&'*+/=?`{|}~^-]+(?:\.[\w!#$%&'*+/=?`{|}~^-]+)*@(?:[\pL0-9-]+\.)+[\pL]{2,6}$>iu,
      "idn-hostname" => ~r/^[\pL0-9](?:[\pL0-9-]{0,61}[\pL0-9])?(?:\.[\pL0-9](?:[-0-9\pL]{0,61}[0-9\pL])?)*$/iu,
      "ipv4" => ~r/^((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4}$/,
      "ipv6" =>
        ~r/^(?:(?:[A-F0-9]{1,4}:){7}[A-F0-9]{1,4}|(?=(?:[A-F0-9]{0,4}:){0,7}[A-F0-9]{0,4}$)(([0-9A-F]{1,4}:){1,7}|:)((:[0-9A-F]{1,4}){1,7}|:)|(?:[A-F0-9]{1,4}:){7}:|:(:[A-F0-9]{1,4}){7})$/i,
      # IRI-reference and IRI patterns use split BMP/supplementary Unicode character classes for PCRE2 compatibility
      "iri-reference" =>
        ~r/^(?:[a-z](?:[-a-z0-9\+\.])*:(?:\/\/(?:(?:%[0-9a-f][0-9a-f]|[-a-z0-9\._~\x{A0}-\x{D7FF}\x{F900}-\x{FDCF}\x{FDF0}-\x{FFEF}!\$&'\(\)\*\+,;=:]|[\x{10000}-\x{1FFFD}\x{20000}-\x{2FFFD}\x{30000}-\x{3FFFD}\x{40000}-\x{4FFFD}\x{50000}-\x{5FFFD}\x{60000}-\x{6FFFD}\x{70000}-\x{7FFFD}\x{80000}-\x{8FFFD}\x{90000}-\x{9FFFD}\x{A0000}-\x{AFFFD}\x{B0000}-\x{BFFFD}\x{C0000}-\x{CFFFD}\x{D0000}-\x{DFFFD}\x{E1000}-\x{EFFFD}])*@)?(?:\[(?:(?:(?:[0-9a-f]{1,4}:){6}(?:[0-9a-f]{1,4}:[0-9a-f]{1,4}|(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(?:\.(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3})|::(?:[0-9a-f]{1,4}:){5}(?:[0-9a-f]{1,4}:[0-9a-f]{1,4}|(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(?:\.(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3})|(?:[0-9a-f]{1,4})?::(?:[0-9a-f]{1,4}:){4}(?:[0-9a-f]{1,4}:[0-9a-f]{1,4}|(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(?:\.(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3})|(?:[0-9a-f]{1,4}:[0-9a-f]{1,4})?::(?:[0-9a-f]{1,4}:){3}(?:[0-9a-f]{1,4}:[0-9a-f]{1,4}|(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(?:\.(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3})|(?:(?:[0-9a-f]{1,4}:){0,2}[0-9a-f]{1,4})?::(?:[0-9a-f]{1,4}:){2}(?:[0-9a-f]{1,4}:[0-9a-f]{1,4}|(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(?:\.(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3})|(?:(?:[0-9a-f]{1,4}:){0,3}[0-9a-f]{1,4})?::[0-9a-f]{1,4}:(?:[0-9a-f]{1,4}:[0-9a-f]{1,4}|(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(?:\.(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3})|(?:(?:[0-9a-f]{1,4}:){0,4}[0-9a-f]{1,4})?::(?:[0-9a-f]{1,4}:[0-9a-f]{1,4}|(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(?:\.(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3})|(?:(?:[0-9a-f]{1,4}:){0,5}[0-9a-f]{1,4})?::[0-9a-f]{1,4}|(?:(?:[0-9a-f]{1,4}:){0,6}[0-9a-f]{1,4})?::)|v[0-9a-f]+[-a-z0-9\._~!\$&'\(\)\*\+,;=:]+)\]|(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(?:\.(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}|(?:%[0-9a-f][0-9a-f]|[-a-z0-9\._~\x{A0}-\x{D7FF}\x{F900}-\x{FDCF}\x{FDF0}-\x{FFEF}!\$&'\(\)\*\+,;=@]|[\x{10000}-\x{1FFFD}\x{20000}-\x{2FFFD}\x{30000}-\x{3FFFD}\x{40000}-\x{4FFFD}\x{50000}-\x{5FFFD}\x{60000}-\x{6FFFD}\x{70000}-\x{7FFFD}\x{80000}-\x{8FFFD}\x{90000}-\x{9FFFD}\x{A0000}-\x{AFFFD}\x{B0000}-\x{BFFFD}\x{C0000}-\x{CFFFD}\x{D0000}-\x{DFFFD}\x{E1000}-\x{EFFFD}])*)(?::[0-9]*)?(?:\/(?:%[0-9a-f][0-9a-f]|[-a-z0-9\._~\x{A0}-\x{D7FF}\x{F900}-\x{FDCF}\x{FDF0}-\x{FFEF}!\$&'\(\)\*\+,;=:@]|[\x{10000}-\x{1FFFD}\x{20000}-\x{2FFFD}\x{30000}-\x{3FFFD}\x{40000}-\x{4FFFD}\x{50000}-\x{5FFFD}\x{60000}-\x{6FFFD}\x{70000}-\x{7FFFD}\x{80000}-\x{8FFFD}\x{90000}-\x{9FFFD}\x{A0000}-\x{AFFFD}\x{B0000}-\x{BFFFD}\x{C0000}-\x{CFFFD}\x{D0000}-\x{DFFFD}\x{E1000}-\x{EFFFD}])*)*|\/(?:(?:(?:%[0-9a-f][0-9a-f]|[-a-z0-9\._~\x{A0}-\x{D7FF}\x{F900}-\x{FDCF}\x{FDF0}-\x{FFEF}!\$&'\(\)\*\+,;=:@]|[\x{10000}-\x{1FFFD}\x{20000}-\x{2FFFD}\x{30000}-\x{3FFFD}\x{40000}-\x{4FFFD}\x{50000}-\x{5FFFD}\x{60000}-\x{6FFFD}\x{70000}-\x{7FFFD}\x{80000}-\x{8FFFD}\x{90000}-\x{9FFFD}\x{A0000}-\x{AFFFD}\x{B0000}-\x{BFFFD}\x{C0000}-\x{CFFFD}\x{D0000}-\x{DFFFD}\x{E1000}-\x{EFFFD}])+)(?:\/(?:%[0-9a-f][0-9a-f]|[-a-z0-9\._~\x{A0}-\x{D7FF}\x{F900}-\x{FDCF}\x{FDF0}-\x{FFEF}!\$&'\(\)\*\+,;=:@]|[\x{10000}-\x{1FFFD}\x{20000}-\x{2FFFD}\x{30000}-\x{3FFFD}\x{40000}-\x{4FFFD}\x{50000}-\x{5FFFD}\x{60000}-\x{6FFFD}\x{70000}-\x{7FFFD}\x{80000}-\x{8FFFD}\x{90000}-\x{9FFFD}\x{A0000}-\x{AFFFD}\x{B0000}-\x{BFFFD}\x{C0000}-\x{CFFFD}\x{D0000}-\x{DFFFD}\x{E1000}-\x{EFFFD}])*)*)?|(?:(?:%[0-9a-f][0-9a-f]|[-a-z0-9\._~\x{A0}-\x{D7FF}\x{F900}-\x{FDCF}\x{FDF0}-\x{FFEF}!\$&'\(\)\*\+,;=:@]|[\x{10000}-\x{1FFFD}\x{20000}-\x{2FFFD}\x{30000}-\x{3FFFD}\x{40000}-\x{4FFFD}\x{50000}-\x{5FFFD}\x{60000}-\x{6FFFD}\x{70000}-\x{7FFFD}\x{80000}-\x{8FFFD}\x{90000}-\x{9FFFD}\x{A0000}-\x{AFFFD}\x{B0000}-\x{BFFFD}\x{C0000}-\x{CFFFD}\x{D0000}-\x{DFFFD}\x{E1000}-\x{EFFFD}])+)(?:\/(?:%[0-9a-f][0-9a-f]|[-a-z0-9\._~\x{A0}-\x{D7FF}\x{F900}-\x{FDCF}\x{FDF0}-\x{FFEF}!\$&'\(\)\*\+,;=:@]|[\x{10000}-\x{1FFFD}\x{20000}-\x{2FFFD}\x{30000}-\x{3FFFD}\x{40000}-\x{4FFFD}\x{50000}-\x{5FFFD}\x{60000}-\x{6FFFD}\x{70000}-\x{7FFFD}\x{80000}-\x{8FFFD}\x{90000}-\x{9FFFD}\x{A0000}-\x{AFFFD}\x{B0000}-\x{BFFFD}\x{C0000}-\x{CFFFD}\x{D0000}-\x{DFFFD}\x{E1000}-\x{EFFFD}])*)*|(?!(?:%[0-9a-f][0-9a-f]|[-a-z0-9\._~\x{A0}-\x{D7FF}\x{F900}-\x{FDCF}\x{FDF0}-\x{FFEF}!\$&'\(\)\*\+,;=:@]|[\x{10000}-\x{1FFFD}\x{20000}-\x{2FFFD}\x{30000}-\x{3FFFD}\x{40000}-\x{4FFFD}\x{50000}-\x{5FFFD}\x{60000}-\x{6FFFD}\x{70000}-\x{7FFFD}\x{80000}-\x{8FFFD}\x{90000}-\x{9FFFD}\x{A0000}-\x{AFFFD}\x{B0000}-\x{BFFFD}\x{C0000}-\x{CFFFD}\x{D0000}-\x{DFFFD}\x{E1000}-\x{EFFFD}])))(?:\?(?:%[0-9a-f][0-9a-f]|[-a-z0-9\._~\x{A0}-\x{D7FF}\x{F900}-\x{FDCF}\x{FDF0}-\x{FFEF}!\$&'\(\)\*\+,;=:@]|[\x{10000}-\x{1FFFD}\x{20000}-\x{2FFFD}\x{30000}-\x{3FFFD}\x{40000}-\x{4FFFD}\x{50000}-\x{5FFFD}\x{60000}-\x{6FFFD}\x{70000}-\x{7FFFD}\x{80000}-\x{8FFFD}\x{90000}-\x{9FFFD}\x{A0000}-\x{AFFFD}\x{B0000}-\x{BFFFD}\x{C0000}-\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      "iri" =>
        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      "json-pointer" => ~r<^(?:\/(?:[^~/]|~0|~1)*)*$>,
      "relative-json-pointer" => ~r<^(?:0|[1-9][0-9]*)(?:#|(?:\/(?:[^~/]|~0|~1)*)*)$>,
      "time" => ~r<^(\d\d):(\d\d):(\d\d)(\.\d+)?(z|[+-]\d\d:\d\d)?$>i,
      "uri-reference" => ~r/^(?:(?:[a-z][a-z0-9+-.]*:)?\/?\/)?(?:[^\\\s#][^\s#]*)?(?:#[^\\\s]*)?$/i,
      "uri" => ~r/^(?:[a-z][a-z0-9+-.]*:)(?:\/?\/)?[^\s]*$/i,
      "uri-template" =>
        ~r<^(?:(?:[^\x00-\x20"'\<\>%\\^`{|}]|%[0-9a-f]{2})|\{[+\#./;?&=,!@|]?(?:[a-z0-9_]|%[0-9a-f]{2})+(?::[1-9][0-9]{0,3}|\*)?(?:,(?:[a-z0-9_]|%[0-9a-f]{2})+(?::[1-9][0-9]{0,3}|\*)?)*\})*$>i
    }[format]
  end
end