veilid/veilid-flutter/lib/veilid_encoding.dart

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import 'dart:convert';
import 'dart:typed_data';
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import 'package:equatable/equatable.dart';
import 'package:freezed_annotation/freezed_annotation.dart';
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String base64UrlNoPadEncode(List<int> bytes) {
var x = base64Url.encode(bytes);
while (x.endsWith('=')) {
x = x.substring(0, x.length - 1);
}
return x;
}
Uint8List base64UrlNoPadDecode(String source) {
source = base64.normalize(source);
return base64.decode(source);
}
Uint8List base64UrlNoPadDecodeDynamic(dynamic source) {
source = source as String;
source = base64.normalize(source);
return base64.decode(source);
}
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class Uint8ListJsonConverter implements JsonConverter<Uint8List, String> {
const Uint8ListJsonConverter();
@override
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Uint8List fromJson(dynamic json) => base64UrlNoPadDecode(json as String);
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@override
String toJson(Uint8List data) => base64UrlNoPadEncode(data);
}
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@immutable
abstract class EncodedString extends Equatable {
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const EncodedString(String s) : contents = s;
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final String contents;
@override
List<Object> get props => [contents];
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Uint8List decode() => base64UrlNoPadDecode(contents);
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@override
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String toString() => contents;
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static T fromBytes<T extends EncodedString>(Uint8List bytes) {
switch (T) {
case FixedEncodedString32:
return FixedEncodedString32.fromBytes(bytes) as T;
case FixedEncodedString43:
return FixedEncodedString43.fromBytes(bytes) as T;
case FixedEncodedString86:
return FixedEncodedString86.fromBytes(bytes) as T;
default:
throw UnimplementedError();
}
}
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static T fromString<T extends EncodedString>(String s) {
switch (T) {
case FixedEncodedString32:
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return FixedEncodedString32.fromString(s) as T;
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case FixedEncodedString43:
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return FixedEncodedString43.fromString(s) as T;
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case FixedEncodedString86:
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return FixedEncodedString86.fromString(s) as T;
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default:
throw UnimplementedError();
}
}
}
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@immutable
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class FixedEncodedString32 extends EncodedString {
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factory FixedEncodedString32.fromBytes(Uint8List bytes) {
if (bytes.length != decodedLength()) {
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throw Exception('length ${bytes.length} should be ${decodedLength()}');
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}
return FixedEncodedString32._(base64UrlNoPadEncode(bytes));
}
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factory FixedEncodedString32.fromString(String s) {
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final d = base64UrlNoPadDecode(s);
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if (d.length != decodedLength()) {
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throw Exception('length ${s.length} should be ${encodedLength()}');
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}
return FixedEncodedString32._(s);
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}
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factory FixedEncodedString32.fromJson(dynamic json) =>
FixedEncodedString32.fromString(json as String);
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const FixedEncodedString32._(super.s);
static int encodedLength() => 32;
static int decodedLength() => 24;
String toJson() => toString();
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}
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@immutable
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class FixedEncodedString43 extends EncodedString {
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factory FixedEncodedString43.fromBytes(Uint8List bytes) {
if (bytes.length != decodedLength()) {
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throw Exception('length ${bytes.length} should be ${decodedLength()}');
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}
return FixedEncodedString43._(base64UrlNoPadEncode(bytes));
}
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factory FixedEncodedString43.fromString(String s) {
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final d = base64UrlNoPadDecode(s);
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if (d.length != decodedLength()) {
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throw Exception('length ${s.length} should be ${encodedLength()}');
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}
return FixedEncodedString43._(s);
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}
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factory FixedEncodedString43.fromJson(dynamic json) =>
FixedEncodedString43.fromString(json as String);
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const FixedEncodedString43._(super.s);
static int encodedLength() => 43;
static int decodedLength() => 32;
String toJson() => toString();
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}
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@immutable
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class FixedEncodedString86 extends EncodedString {
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factory FixedEncodedString86.fromBytes(Uint8List bytes) {
if (bytes.length != decodedLength()) {
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throw Exception('length ${bytes.length} should be ${decodedLength()}');
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}
return FixedEncodedString86._(base64UrlNoPadEncode(bytes));
}
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factory FixedEncodedString86.fromString(String s) {
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final d = base64UrlNoPadDecode(s);
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if (d.length != decodedLength()) {
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throw Exception('length ${s.length} should be ${encodedLength()}');
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}
return FixedEncodedString86._(s);
}
factory FixedEncodedString86.fromJson(dynamic json) =>
FixedEncodedString86.fromString(json as String);
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const FixedEncodedString86._(super.s);
static int encodedLength() => 86;
static int decodedLength() => 64;
String toJson() => toString();
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}