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