136 lines
4.1 KiB
TypeScript
136 lines
4.1 KiB
TypeScript
import * as Clipboard from "expo-clipboard";
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import { useCallback, useEffect, useRef, useState } from "react";
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import { AppState, Text, TouchableOpacity, View } from "react-native";
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import { InputField } from "@/components/input-field";
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import { icons } from "@/constants";
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import { tr } from "@/lib/i18n";
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// `\b` won't match between two digits, so a longer run like an order number
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// never yields a false positive.
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const CODE_PATTERN = /\b\d{6}\b/;
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/** Pulls the 6-digit code out of whatever the user copied from the email. */
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export const extractCode = (raw: string | null | undefined): string | null =>
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raw ? (CODE_PATTERN.exec(raw)?.[0] ?? null) : null;
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type OtpFieldProps = {
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label?: string;
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value: string;
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onChange: (code: string) => void;
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/** Fired once the field holds a complete 6-digit code. */
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onComplete?: (code: string) => void;
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};
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/**
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* Code entry for the emailed verification/reset codes.
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*
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* Three ways in, cheapest first:
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* 1. iOS surfaces the code above the keyboard once Mail has it —
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* `textContentType="oneTimeCode"` is what opts the field into that.
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* 2. Gmail's notification carries a "Copy code" action (Android) and the
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* code is one long-press away on any platform: coming back to the app
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* with a code on the clipboard raises the paste chip below.
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* 3. Typing it.
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*/
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export const OtpField = ({
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label = tr("components.otp.code"),
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value,
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onChange,
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onComplete,
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}: OtpFieldProps) => {
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const [pasteReady, setPasteReady] = useState(false);
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const completedFor = useRef<string | null>(null);
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// `hasStringAsync` inspects the clipboard without reading it, so it never
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// trips the iOS paste prompt — that only fires on the explicit tap below.
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const refreshPasteChip = useCallback(async () => {
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try {
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setPasteReady(await Clipboard.hasStringAsync());
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} catch {
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setPasteReady(false);
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}
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}, []);
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useEffect(() => {
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void refreshPasteChip();
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// The user leaves for Gmail and comes back with the code copied.
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const subscription = AppState.addEventListener("change", (state) => {
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if (state === "active") void refreshPasteChip();
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});
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return () => subscription.remove();
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}, [refreshPasteChip]);
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const handleChange = useCallback(
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(next: string) => {
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// Paste of a whole line ("123456 is your Waseel…") still lands the code.
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const digits =
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next.length > 6
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? (extractCode(next) ?? next.replace(/\D/g, "").slice(0, 6))
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: next.replace(/\D/g, "");
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onChange(digits);
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},
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[onChange],
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);
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const onPastePress = useCallback(async () => {
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try {
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const code = extractCode(await Clipboard.getStringAsync());
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if (code) {
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onChange(code);
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return;
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}
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} catch {
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// Fall through to the hint below.
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}
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setPasteReady(false);
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}, [onChange]);
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// Auto-submit on a complete code, but only once per distinct code so a
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// rejected code isn't resubmitted on every re-render.
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useEffect(() => {
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if (value.length !== 6 || !onComplete) return;
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if (completedFor.current === value) return;
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completedFor.current = value;
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onComplete(value);
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}, [value, onComplete]);
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return (
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<View>
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<InputField
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label={label}
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icon={icons.lock}
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placeholder={tr("components.otp.codePlaceholder")}
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value={value}
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onChangeText={handleChange}
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keyboardType="number-pad"
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maxLength={6}
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// iOS reads codes out of Mail; Android's autofill only covers SMS, so
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// there the paste chip is the fast path.
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textContentType="oneTimeCode"
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autoComplete="one-time-code"
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importantForAutofill="yes"
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inputStyles="tracking-[8px] text-lg"
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/>
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{pasteReady && value.length < 6 ? (
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<TouchableOpacity
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onPress={onPastePress}
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activeOpacity={0.7}
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className="self-start mt-2 rounded-full bg-primary-500/10 px-4 py-2"
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>
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<Text className="text-primary-500 font-JakartaSemiBold text-sm">
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{tr("components.otp.pasteCode")}
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</Text>
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</TouchableOpacity>
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) : null}
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</View>
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);
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};
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