714 lines
30 KiB
Dart
714 lines
30 KiB
Dart
library stripe_native_card_field;
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import 'dart:async';
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import 'dart:convert';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'package:http/http.dart' as http;
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import 'card_details.dart';
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import 'card_provider_icon.dart';
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/// Enum to track each step of the card detail
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/// entry process.
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enum CardEntryStep { number, exp, cvc, postal }
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// enum LoadingLocation { ontop, rightInside }
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/// A uniform text field for entering card details, based
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/// on the behavior of Stripe's various html elements.
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///
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/// Required `width`.
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///
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/// If the provided `width < 450.0`, the `CardTextField`
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/// will scroll its content horizontally with the cursor
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/// to compensate.
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class CardTextField extends StatefulWidget {
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CardTextField({
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Key? key,
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this.onStripeResponse,
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this.onCardDetailsComplete,
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required this.width,
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this.stripePublishableKey,
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this.height,
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this.textStyle,
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this.hintTextStyle,
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this.errorTextStyle,
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this.boxDecoration,
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this.errorBoxDecoration,
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this.loadingWidget,
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this.delayToShowLoading = const Duration(milliseconds: 750),
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this.overrideValidState,
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this.errorText,
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// this.loadingWidgetLocation = LoadingLocation.rightInside,
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}) : super(key: key) {
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if (stripePublishableKey != null) {
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assert(stripePublishableKey!.startsWith('pk_'));
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if (kReleaseMode && !stripePublishableKey!.startsWith('pk_live_')) {
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print('StripeNativeCardField: *WARN* You are not using a live publishableKey in production.');
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} else if ((kDebugMode || kProfileMode) && stripePublishableKey!.startsWith('pk_live_')) {
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print(
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'StripeNativeCardField: *WARN* You are using a live stripe key in a debug environment, proceed with caution!');
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print('StripeNativeCardField: *WARN* Ideally you should be using your test keys whenever not in production.');
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}
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} else {
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if (onStripeResponse != null) {
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print(
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'StripeNativeCardField: *ERROR* You provided the onTokenReceived callback, but did not provide a stripePublishableKey.');
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assert(false);
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}
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}
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}
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/// Overrides the default box decoration of the text field
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final BoxDecoration? boxDecoration;
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/// Overrides the default box decoration of the text field when there is a validation error
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final BoxDecoration? errorBoxDecoration;
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/// Width of the entire CardTextField
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final double width;
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/// Height of the entire CardTextField
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final double? height;
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/// Stripe publishable key, starts with 'pk_'
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final String? stripePublishableKey;
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/// Shown and overrides CircularProgressIndicator() if the request to stripe takes longer than `delayToShowLoading`
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final Widget? loadingWidget;
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/// Default TextStyle
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final TextStyle? textStyle;
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/// Default TextStyle for the hint text in each TextFormField
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final TextStyle? hintTextStyle;
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/// TextStyle used when any TextFormField's have a validation error
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final TextStyle? errorTextStyle;
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/// Time to wait until showing the loading indicator when retrieving Stripe token
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final Duration delayToShowLoading;
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/// Determines where the loading indicator appears when contacting stripe
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// final LoadingLocation loadingWidgetLocation;
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/// Callback that returns the stripe token for the card
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final void Function(Map<String, dynamic>)? onStripeResponse;
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/// Callback that returns the completed CardDetails object
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final void Function(CardDetails)? onCardDetailsComplete;
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/// Can manually override the ValidState to surface errors returned from Stripe
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final ValidState? overrideValidState;
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/// Can manually override the errorText displayed to surface errors returned from Stripe
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final String? errorText;
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@override
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State<CardTextField> createState() => CardTextFieldState();
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}
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/// State Widget for CardTextField
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/// Should not be used directly, create a
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/// `CardTextField()` instead.
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@visibleForTesting
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class CardTextFieldState extends State<CardTextField> {
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late TextEditingController _cardNumberController;
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late TextEditingController _expirationController;
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late TextEditingController _securityCodeController;
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late TextEditingController _postalCodeController;
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// Not made private for access in widget tests
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late FocusNode cardNumberFocusNode;
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late FocusNode expirationFocusNode;
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late FocusNode securityCodeFocusNode;
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late FocusNode postalCodeFocusNode;
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// Not made private for access in widget tests
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late final bool isWideFormat;
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// Widget configurable styles
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late final BoxDecoration _normalBoxDecoration;
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late final BoxDecoration _errorBoxDecoration;
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late final TextStyle _errorTextStyle;
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late final TextStyle _normalTextStyle;
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late final TextStyle _hintTextSyle;
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final double _cardFieldWidth = 180.0;
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final double _expirationFieldWidth = 70.0;
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final double _securityFieldWidth = 40.0;
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final double _postalFieldWidth = 95.0;
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late final double _internalFieldWidth;
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late final double _expanderWidthExpanded;
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late final double _expanderWidthContracted;
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String? _validationErrorText;
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bool _showBorderError = false;
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bool _loading = false;
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final CardDetails _cardDetails = CardDetails.blank();
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int _prevErrorOverrideHash = 0;
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final _currentCardEntryStepController = StreamController<CardEntryStep>();
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final _horizontalScrollController = ScrollController();
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CardEntryStep _currentStep = CardEntryStep.number;
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final _formFieldKey = GlobalKey<FormState>();
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@override
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void initState() {
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_cardNumberController = TextEditingController();
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_expirationController = TextEditingController();
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_securityCodeController = TextEditingController();
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_postalCodeController = TextEditingController();
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cardNumberFocusNode = FocusNode();
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expirationFocusNode = FocusNode();
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securityCodeFocusNode = FocusNode();
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postalCodeFocusNode = FocusNode();
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_errorTextStyle = const TextStyle(color: Colors.red, fontSize: 14, inherit: true).merge(widget.errorTextStyle);
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_normalTextStyle = const TextStyle(color: Colors.black87, fontSize: 14, inherit: true).merge(widget.textStyle);
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_hintTextSyle = const TextStyle(color: Colors.black54, fontSize: 14, inherit: true).merge(widget.hintTextStyle);
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_normalBoxDecoration = BoxDecoration(
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color: const Color(0xfff6f9fc),
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border: Border.all(
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color: const Color(0xffdde0e3),
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width: 2.0,
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),
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borderRadius: BorderRadius.circular(8.0),
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).copyWith(
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backgroundBlendMode: widget.boxDecoration?.backgroundBlendMode,
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border: widget.boxDecoration?.border,
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borderRadius: widget.boxDecoration?.borderRadius,
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boxShadow: widget.boxDecoration?.boxShadow,
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color: widget.boxDecoration?.color,
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gradient: widget.boxDecoration?.gradient,
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image: widget.boxDecoration?.image,
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shape: widget.boxDecoration?.shape,
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);
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_errorBoxDecoration = BoxDecoration(
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color: const Color(0xfff6f9fc),
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border: Border.all(
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color: Colors.red,
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width: 2.0,
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),
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borderRadius: BorderRadius.circular(8.0),
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).copyWith(
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backgroundBlendMode: widget.errorBoxDecoration?.backgroundBlendMode,
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border: widget.errorBoxDecoration?.border,
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borderRadius: widget.errorBoxDecoration?.borderRadius,
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boxShadow: widget.errorBoxDecoration?.boxShadow,
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color: widget.errorBoxDecoration?.color,
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gradient: widget.errorBoxDecoration?.gradient,
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image: widget.errorBoxDecoration?.image,
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shape: widget.errorBoxDecoration?.shape,
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);
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_currentCardEntryStepController.stream.listen(
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_onStepChange,
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);
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RawKeyboard.instance.addListener(_backspaceTransitionListener);
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isWideFormat = widget.width >= 450;
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if (isWideFormat) {
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_internalFieldWidth = widget.width + _postalFieldWidth + 35;
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_expanderWidthExpanded = widget.width - _cardFieldWidth - _expirationFieldWidth - _securityFieldWidth - 35;
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_expanderWidthContracted =
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widget.width - _cardFieldWidth - _expirationFieldWidth - _securityFieldWidth - _postalFieldWidth - 70;
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} else {
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_internalFieldWidth = _cardFieldWidth + _expirationFieldWidth + _securityFieldWidth + _postalFieldWidth + 80;
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}
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super.initState();
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}
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@override
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void dispose() {
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_cardNumberController.dispose();
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_expirationController.dispose();
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_securityCodeController.dispose();
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cardNumberFocusNode.dispose();
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expirationFocusNode.dispose();
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securityCodeFocusNode.dispose();
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RawKeyboard.instance.removeListener(_backspaceTransitionListener);
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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if ((widget.errorText != null || widget.overrideValidState != null) &&
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Object.hashAll([widget.errorText, widget.overrideValidState]) != _prevErrorOverrideHash) {
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_prevErrorOverrideHash = Object.hashAll([widget.errorText, widget.overrideValidState]);
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_validateFields();
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}
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return Column(
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mainAxisAlignment: MainAxisAlignment.center,
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Form(
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key: _formFieldKey,
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child: GestureDetector(
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onTap: () {
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// Focuses to the current field
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_currentCardEntryStepController.add(_currentStep);
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},
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child: Container(
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width: widget.width,
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height: widget.height ?? 60.0,
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decoration: _showBorderError ? _errorBoxDecoration : _normalBoxDecoration,
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child: ClipRect(
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child: IgnorePointer(
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child: SingleChildScrollView(
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controller: _horizontalScrollController,
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scrollDirection: Axis.horizontal,
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child: SizedBox(
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width: _internalFieldWidth,
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height: widget.height ?? 60.0,
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child: Row(
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crossAxisAlignment: CrossAxisAlignment.center,
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mainAxisAlignment: MainAxisAlignment.start,
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children: [
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Padding(
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padding: const EdgeInsets.symmetric(horizontal: 6.0),
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child: CardProviderIcon(
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cardDetails: _cardDetails,
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),
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),
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SizedBox(
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width: _cardFieldWidth,
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child: TextFormField(
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key: const Key('card_field'),
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focusNode: cardNumberFocusNode,
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controller: _cardNumberController,
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keyboardType: TextInputType.number,
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style: _isRedText([ValidState.invalidCard, ValidState.missingCard, ValidState.blank])
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? _errorTextStyle
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: _normalTextStyle,
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validator: (content) {
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if (content == null || content.isEmpty) {
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return null;
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}
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_cardDetails.cardNumber = content;
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if (_cardDetails.validState == ValidState.invalidCard) {
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_setValidationState('Your card number is invalid.');
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} else if (_cardDetails.validState == ValidState.missingCard) {
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_setValidationState('Your card number is incomplete.');
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}
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return null;
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},
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onChanged: (str) {
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final numbers = str.replaceAll(' ', '');
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setState(() => _cardDetails.cardNumber = numbers);
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if (str.length <= _cardDetails.maxINNLength) {
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_cardDetails.detectCardProvider();
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}
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if (numbers.length == 16) {
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_currentCardEntryStepController.add(CardEntryStep.exp);
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}
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},
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onFieldSubmitted: (_) => _currentCardEntryStepController.add(CardEntryStep.exp),
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inputFormatters: [
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LengthLimitingTextInputFormatter(19),
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FilteringTextInputFormatter.allow(RegExp('[0-9 ]')),
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CardNumberInputFormatter(),
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],
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decoration: InputDecoration(
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hintText: 'Card number',
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contentPadding: EdgeInsets.zero,
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hintStyle: _hintTextSyle,
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fillColor: Colors.transparent,
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border: InputBorder.none,
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),
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),
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),
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if (isWideFormat)
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Flexible(
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fit: FlexFit.loose,
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// fit: _currentStep == CardEntryStep.number ? FlexFit.loose : FlexFit.tight,
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child: AnimatedContainer(
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curve: Curves.easeInOut,
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duration: const Duration(milliseconds: 400),
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constraints: _currentStep == CardEntryStep.number
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? BoxConstraints.loose(
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Size(_expanderWidthExpanded, 0.0),
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)
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: BoxConstraints.tight(
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Size(_expanderWidthContracted, 0.0),
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),
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),
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),
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// Spacer(flex: _currentStep == CardEntryStep.number ? 100 : 1),
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SizedBox(
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width: _expirationFieldWidth,
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child: TextFormField(
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key: const Key('expiration_field'),
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focusNode: expirationFocusNode,
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controller: _expirationController,
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style: _isRedText([
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ValidState.dateTooLate,
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ValidState.dateTooEarly,
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ValidState.missingDate,
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ValidState.invalidMonth
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])
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? _errorTextStyle
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: _normalTextStyle,
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validator: (content) {
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if (content == null || content.isEmpty) {
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return null;
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}
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setState(() => _cardDetails.expirationString = content);
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if (_cardDetails.validState == ValidState.dateTooEarly) {
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_setValidationState('Your card\'s expiration date is in the past.');
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} else if (_cardDetails.validState == ValidState.dateTooLate) {
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_setValidationState('Your card\'s expiration year is invalid.');
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} else if (_cardDetails.validState == ValidState.missingDate) {
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_setValidationState('You must include your card\'s expiration date.');
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} else if (_cardDetails.validState == ValidState.invalidMonth) {
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_setValidationState('Your card\'s expiration month is invalid.');
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}
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return null;
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},
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onChanged: (str) {
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setState(() => _cardDetails.expirationString = str);
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if (str.length == 5) {
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_currentCardEntryStepController.add(CardEntryStep.cvc);
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}
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},
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onFieldSubmitted: (_) => _currentCardEntryStepController.add(CardEntryStep.cvc),
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inputFormatters: [
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LengthLimitingTextInputFormatter(5),
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FilteringTextInputFormatter.allow(RegExp('[0-9/]')),
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CardExpirationFormatter(),
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],
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decoration: InputDecoration(
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contentPadding: EdgeInsets.zero,
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hintText: 'MM/YY',
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hintStyle: _hintTextSyle,
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fillColor: Colors.transparent,
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border: InputBorder.none,
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),
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),
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),
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SizedBox(
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width: _securityFieldWidth,
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child: TextFormField(
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key: const Key('security_field'),
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focusNode: securityCodeFocusNode,
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controller: _securityCodeController,
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style: _isRedText([ValidState.invalidCVC, ValidState.missingCVC])
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? _errorTextStyle
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: _normalTextStyle,
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validator: (content) {
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if (content == null || content.isEmpty) {
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return null;
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}
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setState(() => _cardDetails.securityCode = content);
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if (_cardDetails.validState == ValidState.invalidCVC) {
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_setValidationState('Your card\'s security code is invalid.');
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} else if (_cardDetails.validState == ValidState.missingCVC) {
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_setValidationState('Your card\'s security code is incomplete.');
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}
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return null;
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},
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onFieldSubmitted: (_) => _currentCardEntryStepController.add(CardEntryStep.postal),
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onChanged: (str) {
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setState(() => _cardDetails.expirationString = str);
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if (str.length == _cardDetails.provider?.cvcLength) {
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_currentCardEntryStepController.add(CardEntryStep.postal);
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}
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},
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inputFormatters: [
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LengthLimitingTextInputFormatter(
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_cardDetails.provider == null ? 4 : _cardDetails.provider!.cvcLength),
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FilteringTextInputFormatter.allow(RegExp('[0-9]')),
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],
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decoration: InputDecoration(
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contentPadding: EdgeInsets.zero,
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hintText: 'CVC',
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hintStyle: _hintTextSyle,
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fillColor: Colors.transparent,
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border: InputBorder.none,
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),
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),
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),
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SizedBox(
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width: _postalFieldWidth,
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child: TextFormField(
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key: const Key('postal_field'),
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focusNode: postalCodeFocusNode,
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controller: _postalCodeController,
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style: _isRedText([ValidState.invalidZip, ValidState.missingZip])
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? _errorTextStyle
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: _normalTextStyle,
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validator: (content) {
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if (content == null || content.isEmpty) {
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return null;
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}
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setState(() => _cardDetails.postalCode = content);
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if (_cardDetails.validState == ValidState.invalidZip) {
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_setValidationState('The postal code you entered is not correct.');
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} else if (_cardDetails.validState == ValidState.missingZip) {
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_setValidationState('You must enter your card\'s postal code.');
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}
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return null;
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},
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onChanged: (str) {
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setState(() => _cardDetails.postalCode = str);
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},
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textInputAction: TextInputAction.done,
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onFieldSubmitted: (_) async {
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_validateFields();
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if (_cardDetails.isComplete) {
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if (widget.onCardDetailsComplete != null) {
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widget.onCardDetailsComplete!(_cardDetails);
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} else if (widget.onStripeResponse != null) {
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bool returned = false;
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Future.delayed(
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const Duration(milliseconds: 750),
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() => returned ? null : setState(() => _loading = true),
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);
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const stripeCardUrl = 'https://api.stripe.com/v1/tokens';
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final response = await http.post(
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Uri.parse(stripeCardUrl),
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body: {
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'card[number]': _cardDetails.cardNumber,
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'card[cvc]': _cardDetails.securityCode,
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'card[exp_month]': _cardDetails.expMonth,
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'card[exp_year]': _cardDetails.expYear,
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'card[address_zip]': _cardDetails.postalCode,
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'key': widget.stripePublishableKey,
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},
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headers: {"Content-Type": "application/x-www-form-urlencoded"},
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);
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returned = true;
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final jsonBody = jsonDecode(response.body);
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widget.onStripeResponse!(jsonBody);
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if (_loading) setState(() => _loading = false);
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}
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}
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},
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decoration: InputDecoration(
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contentPadding: EdgeInsets.zero,
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hintText: 'Postal Code',
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hintStyle: _hintTextSyle,
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fillColor: Colors.transparent,
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border: InputBorder.none,
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),
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),
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),
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AnimatedOpacity(
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duration: const Duration(milliseconds: 300),
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opacity: _loading ? 1.0 : 0.0,
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child: widget.loadingWidget ?? const CircularProgressIndicator(),
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|
),
|
|
],
|
|
),
|
|
),
|
|
),
|
|
),
|
|
),
|
|
),
|
|
),
|
|
),
|
|
AnimatedOpacity(
|
|
duration: const Duration(milliseconds: 525),
|
|
opacity: _validationErrorText == null ? 0.0 : 1.0,
|
|
child: Padding(
|
|
padding: const EdgeInsets.only(top: 8.0, left: 14.0),
|
|
child: Text(
|
|
_validationErrorText ?? '',
|
|
style: const TextStyle(color: Colors.red),
|
|
),
|
|
),
|
|
),
|
|
],
|
|
);
|
|
}
|
|
|
|
/// Provided a list of `ValidState`, returns whether
|
|
/// make the text field red
|
|
bool _isRedText(List<ValidState> args) {
|
|
return _showBorderError && args.contains(_cardDetails.validState);
|
|
}
|
|
|
|
/// Helper function to change the `_showBorderError` and
|
|
/// `_validationErrorText`.
|
|
void _setValidationState(String? text) {
|
|
setState(() {
|
|
_validationErrorText = text;
|
|
_showBorderError = text != null;
|
|
});
|
|
}
|
|
|
|
/// Calls `validate()` on the form state and resets
|
|
/// the validation state
|
|
void _validateFields() {
|
|
_validationErrorText = null;
|
|
if (widget.overrideValidState != null) {
|
|
_cardDetails.overrideValidState = widget.overrideValidState!;
|
|
_setValidationState(widget.errorText);
|
|
} else {
|
|
_formFieldKey.currentState!.validate();
|
|
|
|
// Clear up validation state if everything is valid
|
|
if (_validationErrorText == null) {
|
|
_setValidationState(null);
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
/// Used when `_isWideFormat == false`, scrolls
|
|
/// the `_horizontalScrollController` to a given offset
|
|
void _scrollRow(CardEntryStep step) {
|
|
const dur = Duration(milliseconds: 150);
|
|
const cur = Curves.easeOut;
|
|
switch (step) {
|
|
case CardEntryStep.number:
|
|
_horizontalScrollController.animateTo(0.0, duration: dur, curve: cur);
|
|
break;
|
|
case CardEntryStep.exp:
|
|
_horizontalScrollController.animateTo(_cardFieldWidth / 2, duration: dur, curve: cur);
|
|
break;
|
|
case CardEntryStep.cvc:
|
|
_horizontalScrollController.animateTo(_cardFieldWidth / 2 + _expirationFieldWidth, duration: dur, curve: cur);
|
|
break;
|
|
case CardEntryStep.postal:
|
|
_horizontalScrollController.animateTo(_cardFieldWidth / 2 + _expirationFieldWidth + _securityFieldWidth,
|
|
duration: dur, curve: cur);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/// Function that is listening to the `_currentCardEntryStepController`
|
|
/// StreamController. Manages validation and tracking of the current step
|
|
/// as well as scrolling the text fields.
|
|
void _onStepChange(CardEntryStep step) {
|
|
if (_currentStep.index < step.index) {
|
|
_validateFields();
|
|
} else if (_currentStep != step) {
|
|
_setValidationState(null);
|
|
}
|
|
|
|
setState(() {
|
|
_currentStep = step;
|
|
});
|
|
switch (step) {
|
|
case CardEntryStep.number:
|
|
cardNumberFocusNode.requestFocus();
|
|
break;
|
|
case CardEntryStep.exp:
|
|
expirationFocusNode.requestFocus();
|
|
break;
|
|
case CardEntryStep.cvc:
|
|
securityCodeFocusNode.requestFocus();
|
|
break;
|
|
case CardEntryStep.postal:
|
|
postalCodeFocusNode.requestFocus();
|
|
break;
|
|
}
|
|
if (!isWideFormat) {
|
|
_scrollRow(step);
|
|
}
|
|
}
|
|
|
|
/// Function that is listening to the keyboard events.
|
|
///
|
|
/// This provides the functionality of hitting backspace
|
|
/// and the focus changing between fields when the current
|
|
/// entry step is empty.
|
|
void _backspaceTransitionListener(RawKeyEvent value) {
|
|
if (!value.isKeyPressed(LogicalKeyboardKey.backspace)) {
|
|
return;
|
|
}
|
|
switch (_currentStep) {
|
|
case CardEntryStep.number:
|
|
break;
|
|
case CardEntryStep.exp:
|
|
final expStr = _expirationController.text;
|
|
if (expStr.isNotEmpty) break;
|
|
_currentCardEntryStepController.add(CardEntryStep.number);
|
|
String numStr = _cardNumberController.text;
|
|
_cardNumberController.text = numStr.substring(0, numStr.length - 1);
|
|
break;
|
|
case CardEntryStep.cvc:
|
|
final cvcStr = _securityCodeController.text;
|
|
if (cvcStr.isNotEmpty) break;
|
|
_currentCardEntryStepController.add(CardEntryStep.exp);
|
|
final expStr = _expirationController.text;
|
|
_expirationController.text = expStr.substring(0, expStr.length - 1);
|
|
case CardEntryStep.postal:
|
|
final String postalStr = _postalCodeController.text;
|
|
if (postalStr.isNotEmpty) break;
|
|
_currentCardEntryStepController.add(CardEntryStep.cvc);
|
|
final String cvcStr = _securityCodeController.text;
|
|
_securityCodeController.text = cvcStr.substring(0, cvcStr.length - 1);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Formatter that adds the appropriate space ' ' characters
|
|
/// to make the card number display cleanly.
|
|
class CardNumberInputFormatter implements TextInputFormatter {
|
|
@override
|
|
TextEditingValue formatEditUpdate(TextEditingValue oldValue, TextEditingValue newValue) {
|
|
String cardNum = newValue.text;
|
|
if (cardNum.length <= 4) return newValue;
|
|
|
|
cardNum = cardNum.replaceAll(' ', '');
|
|
StringBuffer buffer = StringBuffer();
|
|
|
|
for (int i = 0; i < cardNum.length; i++) {
|
|
buffer.write(cardNum[i]);
|
|
int nonZeroIndex = i + 1;
|
|
if (nonZeroIndex % 4 == 0 && nonZeroIndex != cardNum.length) {
|
|
buffer.write(' ');
|
|
}
|
|
}
|
|
|
|
return newValue.copyWith(text: buffer.toString(), selection: TextSelection.collapsed(offset: buffer.length));
|
|
}
|
|
}
|
|
|
|
/// Formatter that adds a backslash '/' character in between
|
|
/// the month and the year for the expiration date.
|
|
class CardExpirationFormatter implements TextInputFormatter {
|
|
@override
|
|
TextEditingValue formatEditUpdate(TextEditingValue oldValue, TextEditingValue newValue) {
|
|
String cardExp = newValue.text;
|
|
if (cardExp.length == 1) {
|
|
if (cardExp[0] == '0' || cardExp[0] == '1') {
|
|
return newValue;
|
|
} else {
|
|
cardExp = '0$cardExp';
|
|
}
|
|
}
|
|
if (cardExp.length == 2 && oldValue.text.length == 3) return newValue;
|
|
|
|
cardExp = cardExp.replaceAll('/', '');
|
|
StringBuffer buffer = StringBuffer();
|
|
|
|
for (int i = 0; i < cardExp.length; i++) {
|
|
buffer.write(cardExp[i]);
|
|
int nonZeroIndex = i + 1;
|
|
if (nonZeroIndex == 2) {
|
|
buffer.write('/');
|
|
}
|
|
}
|
|
return newValue.copyWith(text: buffer.toString(), selection: TextSelection.collapsed(offset: buffer.length));
|
|
}
|
|
}
|