nostrmarket/static/market/js/utils.js

var NostrTools = window.NostrTools

var defaultRelays = [
    'wss://relay.damus.io',
    'wss://relay.snort.social',
    'wss://nostr-pub.wellorder.net',
    'wss://nostr.zebedee.cloud',
    'wss://nostr.walletofsatoshi.com'
]
var eventToObj = event => {
    try {
        event.content = JSON.parse(event.content) || null
    } catch {
        event.content = null
    }


    return {
        ...event,
        ...Object.values(event.tags).reduce((acc, tag) => {
            let [key, value] = tag
            if (key == 't') {
                return { ...acc, [key]: [...(acc[key] || []), value] }
            } else {
                return { ...acc, [key]: value }
            }
        }, {})
    }
}

function confirm(message) {
    return {
        message,
        ok: {
            flat: true,
            color: 'primary'
        },
        cancel: {
            flat: true,
            color: 'grey'
        }
    }
}


async function hash(string) {
    const utf8 = new TextEncoder().encode(string)
    const hashBuffer = await crypto.subtle.digest('SHA-256', utf8)
    const hashArray = Array.from(new Uint8Array(hashBuffer))
    const hashHex = hashArray
        .map(bytes => bytes.toString(16).padStart(2, '0'))
        .join('')
    return hashHex
}

function isJson(str) {
    if (typeof str !== 'string') {
        return false
    }
    try {
        JSON.parse(str)
        return true
    } catch (error) {
        return false
    }
}

function formatSat(value) {
    return new Intl.NumberFormat(window.LOCALE).format(value)
}

function satOrBtc(val, showUnit = true, showSats = false) {
    const value = showSats
        ? formatSat(val)
        : val == 0
            ? 0.0
            : (val / 100000000).toFixed(8)
    if (!showUnit) return value
    return showSats ? value + ' sat' : value + ' BTC'
}

function timeFromNow(time) {
    // Get timestamps
    let unixTime = new Date(time).getTime()
    if (!unixTime) return
    let now = new Date().getTime()

    // Calculate difference
    let difference = unixTime / 1000 - now / 1000

    // Setup return object
    let tfn = {}

    // Check if time is in the past, present, or future
    tfn.when = 'now'
    if (difference > 0) {
        tfn.when = 'future'
    } else if (difference < -1) {
        tfn.when = 'past'
    }

    // Convert difference to absolute
    difference = Math.abs(difference)

    // Calculate time unit
    if (difference / (60 * 60 * 24 * 365) > 1) {
        // Years
        tfn.unitOfTime = 'years'
        tfn.time = Math.floor(difference / (60 * 60 * 24 * 365))
    } else if (difference / (60 * 60 * 24 * 45) > 1) {
        // Months
        tfn.unitOfTime = 'months'
        tfn.time = Math.floor(difference / (60 * 60 * 24 * 45))
    } else if (difference / (60 * 60 * 24) > 1) {
        // Days
        tfn.unitOfTime = 'days'
        tfn.time = Math.floor(difference / (60 * 60 * 24))
    } else if (difference / (60 * 60) > 1) {
        // Hours
        tfn.unitOfTime = 'hours'
        tfn.time = Math.floor(difference / (60 * 60))
    } else if (difference / 60 > 1) {
        // Minutes
        tfn.unitOfTime = 'minutes'
        tfn.time = Math.floor(difference / 60)
    } else {
        // Seconds
        tfn.unitOfTime = 'seconds'
        tfn.time = Math.floor(difference)
    }

    // Return time from now data
    return `${tfn.time} ${tfn.unitOfTime}`
}

function isValidImageUrl(string) {
    let url
    try {
        url = new URL(string)
    } catch (_) {
        return false
    }
    return url.protocol === 'http:' || url.protocol === 'https:'
}

function isValidKey(key, prefix = 'n') {
    try {
        if (key && key.startsWith(prefix)) {
            let { _, data } = NostrTools.nip19.decode(key)
            key = data
        }
        return isValidKeyHex(key)
    } catch (error) {
        return false
    }
}

function isValidKeyHex(key) {
    return key?.toLowerCase()?.match(/^[0-9a-f]{64}$/)
}

function formatCurrency(value, currency) {
    return new Intl.NumberFormat(window.LOCALE, {
        style: 'currency',
        currency: currency
    }).format(value)
}