101 lines
2.6 KiB
Dart
101 lines
2.6 KiB
Dart
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import 'dart:convert';
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import 'dart:io';
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import 'package:http/http.dart' as http;
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import 'package:signature/signature.dart';
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class TimedPoint {
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final DateTime time;
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final Point point;
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const TimedPoint({
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required this.time,
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required this.point,
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});
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}
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class HandwritingRequest {
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final double appVersion;
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final String apiLevel;
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String? device;
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final int inputType;
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final String options;
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final int writingAreaWidth;
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final int writingAreaHeight;
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final String preContext;
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final int maxNumResults;
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final int maxCompletions;
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final String language;
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final List<List<TimedPoint>> ink;
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HandwritingRequest({
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this.appVersion = 0.4,
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this.apiLevel = '537.36',
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this.device,
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this.inputType = 0,
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this.options = 'enable_pre_space',
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required this.writingAreaWidth,
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required this.writingAreaHeight,
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this.preContext = '',
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this.maxNumResults = 10,
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this.maxCompletions = 0,
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this.language = 'ja',
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required this.ink,
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});
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List<List<dynamic>> get formattedInk => ink
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.map(
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(stroke) => [
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stroke.map((tp) => tp.point.offset.dx).toList(),
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stroke.map((tp) => tp.point.offset.dy).toList(),
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stroke
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.map((tp) => tp.time.difference(stroke.first.time).inMilliseconds)
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.toList(),
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],
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)
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.toList();
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Map<String, Object?> toJson() => {
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'app_version': appVersion,
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'api_level': apiLevel,
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'device': device,
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'input_type': inputType,
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'options': options,
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'requests': [
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{
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'writing_guide': {
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'writing_area_width': writingAreaWidth,
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'writing_area_height': writingAreaHeight
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},
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'pre_context': preContext,
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'max_num_results': maxNumResults,
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'max_completions': maxCompletions,
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'language': language,
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'ink': formattedInk,
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}
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]
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};
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Future<List<String>> fetch() async {
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device ??= HttpClient().userAgent;
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final response = await http.post(
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Uri.parse(
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'https://inputtools.google.com/request?itc=ja-t-i0-handwrit&app=translate',
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),
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headers: <String, String>{
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'Content-Type': 'application/json; charset=UTF-8',
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},
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body: jsonEncode(this),
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);
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final List<dynamic> json = jsonDecode(response.body);
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// TODO: add a more detailed error.
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if (response.statusCode != 200 || json[0] != 'SUCCESS') throw Error();
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return (((json[1] as List<dynamic>)[0] as List<dynamic>)[1]
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as List<dynamic>)
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.map((e) => e as String)
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.toList();
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}
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}
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