Feat: add verification capthca and form adjustment
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hasyim_kai
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<script setup lang="ts">
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import { ref, computed, watch, defineEmits, defineProps, onMounted, nextTick, defineExpose } from 'vue'
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import Input from '~/components/pub/ui/input/Input.vue';
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import Button from '~/components/pub/ui/button/Button.vue';
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import waveyFingerprint from '~/assets/svg/wavey-fingerprint.svg'
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/**
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* TextCaptcha props:
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* - length: number of characters in the core captcha
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* - caseSensitive: whether validation is case sensitive
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* - useSpacing: show spaced-out characters (visual obfuscation only)
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* - noiseChars: include random noise characters visually (not required to type)
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*/
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const props = defineProps({
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length: { type: Number, default: 6 },
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caseSensitive: { type: Boolean, default: false },
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useSpacing: { type: Boolean, default: true },
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noiseChars: { type: Boolean, default: false }, // adds random noise characters to display
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refreshCooldownMs: { type: Number, default: 500 }, // guard repeated refresh
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})
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const emit = defineEmits<{
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(e: 'update:valid', valid: boolean): void
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(e: 'validated', valid: boolean): void
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(e: 'change', value: string): void
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}>()
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// Internal state
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const raw = ref('') // the canonical captcha value (what user must match, ignoring visual noise)
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const display = ref('') // randomized visual representation (may include spacing/noise)
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const input = ref('') // user typed value
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const lastRefresh = ref(0)
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const valid = inject('isCaptchaValid') as Ref<boolean>
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const errorMessage = ref('')
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/** Characters excluding ambiguous ones: 0/O, 1/l/I etc. */
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const CHARS = '23456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
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function randomChar() {
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return CHARS.charAt(Math.floor(Math.random() * CHARS.length))
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}
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/** Generate the canonical captcha string */
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function genRaw(len = props.length) {
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let s = ''
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for (let i = 0; i < len; i++) s += randomChar()
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return s
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}
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/** Create a visually obfuscated display string (spacing, noise, random case) */
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function genDisplay(base: string) {
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const arr: string[] = []
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for (const ch of base) {
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// toggle case randomly (only for letters)
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const c = /[A-Za-z]/.test(ch) && Math.random() > 0.5 ? (Math.random() > 0.5 ? ch.toLowerCase() : ch.toUpperCase()) : ch
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arr.push(c)
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if (props.useSpacing && Math.random() > 0.3) arr.push(' ') // random space
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}
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return arr.join('')
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}
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/** Refresh captcha */
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function refresh() {
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const now = Date.now()
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if (now - lastRefresh.value < props.refreshCooldownMs) return
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lastRefresh.value = now
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raw.value = genRaw(props.length)
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display.value = genDisplay(raw.value)
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input.value = ''
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valid.value = false
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errorMessage.value = ''
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// emit change so parent knows new value (but we don't send the raw canonical in production)
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emit('change', display.value)
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}
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/** Normalize input and canonical for comparison */
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function normalizeForCompare(s: string) {
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const normalized = s.replace(/\s+/g, '') // strip spaces
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return props.caseSensitive ? normalized : normalized.toLowerCase()
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}
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/** Validate the current input */
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function validate() {
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const left = normalizeForCompare(input.value)
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const right = normalizeForCompare(raw.value)
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if (!input.value) {
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valid.value = false
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errorMessage.value = 'Please enter the captcha text.'
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} else if (left === right) {
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valid.value = true
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errorMessage.value = ''
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} else {
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valid.value = false
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errorMessage.value = 'Captcha does not match.'
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}
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emit('update:valid', valid.value)
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emit('validated', valid.value)
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return valid.value
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}
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// expose a refresh method to parent via ref
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defineExpose({ refresh, validate, isValid: computed(() => valid.value) })
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// generate on mount
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onMounted(() => refresh())
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// // re-validate whenever input changes (lightweight)
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// watch(input, () => {
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// // we don't auto-pass until the user explicitly validate (but we can optionally live-validate)
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// // Here we perform live feedback but still emit validated only when called
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// const left = normalizeForCompare(input.value)
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// const right = normalizeForCompare(raw.value)
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// valid.value = !!input.value && left === right
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// // emit a live update so the parent can disable submit accordingly
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// emit('update:valid', valid.value)
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// })
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</script>
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<template>
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<div class="space-y-2 w-full max-w-sm">
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<div class="flex items-center justify-between gap-3">
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<!-- Captcha visual box -->
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<div
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role="img"
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aria-label="Text captcha, type the characters shown"
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tabindex="0"
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class="select-none p-3 rounded-md border border-gray-200 text-white text-xl font-mono tracking-wider text-center w-full"
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>
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<span class="inline-block" v-html="display"></span>
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</div>
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<!-- Refresh -->
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<div class="flex-shrink-0">
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<Button variant="ghost" type="button" @click="refresh" title="Refresh captcha">
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<Icon name="i-lucide-refresh-cw" />
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</Button>
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</div>
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</div>
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<!-- Input -->
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<div class="flex gap-3 items-start">
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<div class="flex-grow">
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<Input
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v-model="input"
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:aria-invalid="valid ? 'false' : 'true'"
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inputmode="text"
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placeholder="Type the captcha text"
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@keyup.enter="validate"
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/>
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<p v-if="errorMessage" class="text-xs text-red-500 mt-1">{{ errorMessage }}</p>
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<p v-else-if="valid" class="text-xs text-green-500 mt-1">Correct</p>
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<p v-else class="text-xs text-gray-500 mt-1">Not case-sensitive</p>
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</div>
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<Button variant="outline" type="button" @click="validate" title="Validate"
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class="border-orange-400">
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<Icon name="i-lucide-check" class="text-orange-400" />
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</Button>
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</div>
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</div>
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</template>
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<style scoped>
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/* small nicety: make noise/spaced display look irregular */
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div[role="img"] {
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background: url('~/assets/svg/wavey-fingerprint.svg') repeat center;
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}
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div[role="img"] span {
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letter-spacing: 0.12em;
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font-weight: 600;
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user-select: none;
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}
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</style>
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