55 lines
1.7 KiB
Dart
55 lines
1.7 KiB
Dart
// Run this with "Basic QWxhZGRpbjpPcGVuU2VzYW1l"
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import 'dart:convert';
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import 'dart:io';
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import 'package:angel3_combinator/angel3_combinator.dart';
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import 'package:string_scanner/string_scanner.dart';
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/// Parse a part of a decoded Basic auth string.
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///
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/// Namely, the `username` or `password` in `{username}:{password}`.
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final Parser<String> string =
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match<String>(RegExp(r'[^:$]+'), errorMessage: 'Expected a string.')
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.value((r) => r.span!.text);
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/// Transforms `{username}:{password}` to `{"username": username, "password": password}`.
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final Parser<Map<String, String>> credentials = chain<String>([
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string.opt(),
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match<String>(':'),
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string.opt(),
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]).map<Map<String, String>>(
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(r) => {'username': r.value![0], 'password': r.value![2]});
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/// We can actually embed a parser within another parser.
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///
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/// This is used here to BASE64URL-decode a string, and then
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/// parse the decoded string.
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final Parser credentialString = match<Map<String, String>?>(
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RegExp(r'([^\n$]+)'),
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errorMessage: 'Expected a credential string.')
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.value((r) {
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var decoded = utf8.decode(base64Url.decode(r.span!.text));
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var scanner = SpanScanner(decoded);
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return credentials.parse(scanner).value;
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});
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final Parser basic = match<Null>('Basic').space();
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final Parser basicAuth = basic.then(credentialString).index(1);
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void main() {
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while (true) {
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stdout.write('Enter a basic auth value: ');
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var line = stdin.readLineSync()!;
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var scanner = SpanScanner(line, sourceUrl: 'stdin');
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var result = basicAuth.parse(scanner);
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if (!result.successful) {
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for (var error in result.errors) {
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print(error.toolString);
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print(error.span!.highlight(color: true));
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}
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} else
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print(result.value);
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}
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}
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