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103 lines
3.3 KiB
JavaScript
103 lines
3.3 KiB
JavaScript
// When phone numbers are written in `RFC3966` format — `"tel:+12133734253"` —
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// they can have their "calling code" part written separately in a `phone-context` parameter.
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// Example: `"tel:12133734253;phone-context=+1"`.
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// This function parses the full phone number from the local number and the `phone-context`
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// when the `phone-context` contains a `+` sign.
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import {
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VALID_DIGITS,
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// PLUS_CHARS
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} from '../constants.js'
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export const PLUS_SIGN = '+'
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const RFC3966_VISUAL_SEPARATOR_ = '[\\-\\.\\(\\)]?'
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const RFC3966_PHONE_DIGIT_ = '(' + '[' + VALID_DIGITS + ']' + '|' + RFC3966_VISUAL_SEPARATOR_ + ')'
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const RFC3966_GLOBAL_NUMBER_DIGITS_ =
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'^' +
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'\\' +
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PLUS_SIGN +
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RFC3966_PHONE_DIGIT_ +
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'*' +
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'[' + VALID_DIGITS + ']' +
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RFC3966_PHONE_DIGIT_ +
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'*' +
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'$'
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/**
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* Regular expression of valid global-number-digits for the phone-context
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* parameter, following the syntax defined in RFC3966.
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*/
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const RFC3966_GLOBAL_NUMBER_DIGITS_PATTERN_ = new RegExp(RFC3966_GLOBAL_NUMBER_DIGITS_, 'g')
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// In this port of Google's library, we don't accept alpha characters in phone numbers.
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// const ALPHANUM_ = VALID_ALPHA_ + VALID_DIGITS
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const ALPHANUM_ = VALID_DIGITS
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const RFC3966_DOMAINLABEL_ = '[' + ALPHANUM_ + ']+((\\-)*[' + ALPHANUM_ + '])*'
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const VALID_ALPHA_ = 'a-zA-Z'
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const RFC3966_TOPLABEL_ = '[' + VALID_ALPHA_ + ']+((\\-)*[' + ALPHANUM_ + '])*'
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const RFC3966_DOMAINNAME_ = '^(' + RFC3966_DOMAINLABEL_ + '\\.)*' + RFC3966_TOPLABEL_ + '\\.?$'
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/**
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* Regular expression of valid domainname for the phone-context parameter,
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* following the syntax defined in RFC3966.
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*/
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const RFC3966_DOMAINNAME_PATTERN_ = new RegExp(RFC3966_DOMAINNAME_, 'g')
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export const RFC3966_PREFIX_ = 'tel:'
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export const RFC3966_PHONE_CONTEXT_ = ';phone-context='
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export const RFC3966_ISDN_SUBADDRESS_ = ';isub='
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/**
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* Extracts the value of the phone-context parameter of `numberToExtractFrom`,
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* following the syntax defined in RFC3966.
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*
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* @param {string} numberToExtractFrom
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* @return {string|null} the extracted string (possibly empty), or `null` if no phone-context parameter is found.
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*/
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export default function extractPhoneContext(numberToExtractFrom) {
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const indexOfPhoneContext = numberToExtractFrom.indexOf(RFC3966_PHONE_CONTEXT_)
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// If no phone-context parameter is present
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if (indexOfPhoneContext < 0) {
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return null
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}
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const phoneContextStart = indexOfPhoneContext + RFC3966_PHONE_CONTEXT_.length
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// If phone-context parameter is empty
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if (phoneContextStart >= numberToExtractFrom.length) {
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return ''
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}
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const phoneContextEnd = numberToExtractFrom.indexOf(';', phoneContextStart)
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// If phone-context is not the last parameter
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if (phoneContextEnd >= 0) {
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return numberToExtractFrom.substring(phoneContextStart, phoneContextEnd)
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} else {
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return numberToExtractFrom.substring(phoneContextStart)
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}
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}
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/**
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* Returns whether the value of phoneContext follows the syntax defined in RFC3966.
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*
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* @param {string|null} phoneContext
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* @return {boolean}
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*/
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export function isPhoneContextValid(phoneContext) {
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if (phoneContext === null) {
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return true
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}
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if (phoneContext.length === 0) {
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return false
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}
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// Does phone-context value match pattern of global-number-digits or domainname.
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return RFC3966_GLOBAL_NUMBER_DIGITS_PATTERN_.test(phoneContext) ||
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RFC3966_DOMAINNAME_PATTERN_.test(phoneContext)
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} |