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45 lines
1.7 KiB
JavaScript
45 lines
1.7 KiB
JavaScript
(function () {
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'use strict';
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// Utility function: Base64 Decoding.
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function decodeBase64(encodedString) {
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try {
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// Can't use atob() directly because it doesn't support non-ascii characters.
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// And non-ascii characters are allowed in email addresses and domains.
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// See https://en.wikipedia.org/wiki/Email_address#Internationalization
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// Code below adapted from Jackie Han: https://stackoverflow.com/a/64752311
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const byteString = atob(encodedString);
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// Convert byteString to an array of char codes.
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const charCodes = [...byteString].map((char) => char.charCodeAt(0));
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// Use TypedArray.prototype.set() to copy the char codes into a Uint8Array.
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const bytes = new Uint8Array(charCodes.length);
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bytes.set(charCodes);
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const decoder = new TextDecoder('utf-8');
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return decoder.decode(bytes);
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} catch (e) {
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console.error('Failed to decode Base64 string: ', e);
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return null;
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}
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}
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// Utility function: Update href of an element with a decoded email.
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function updateEmailHref(element) {
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const encodedEmail = element.getAttribute('data-encoded-email');
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const decodedEmail = decodeBase64(encodedEmail);
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if (decodedEmail) {
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element.setAttribute('href', `mailto:${decodedEmail}`);
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} else {
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// If the decoding fails, hide the email link.
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element.style.display = 'none';
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}
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}
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// Fetch and process email elements with the "data-encoded-email" attribute.
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const encodedEmailElements = document.querySelectorAll('[data-encoded-email]');
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encodedEmailElements.forEach(updateEmailHref);
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})();
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