Website-development/Лаб5.2.html at master · ElenaDanchenko/Website-development · GitHub

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<html>
<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8">
		<title>Дешифрование текста</title>
	</head>

<body>
	<button onclick="decryptText()">Раскодировать текст</button><br><br>
	<textarea id="output" rows="4" cols="50" style="display: none;"></textarea>

	<script>

		let customCharCodes = {
		  'А': 1, 'Б': 2, 'В': 3, 'Г': 4, 'Д': 5, 'Е': 6, 'Ё': 7, 'Ж': 8, 'З': 9, 'И': 10,
		  'Й': 11, 'К': 12, 'Л': 13, 'М': 14, 'Н': 15, 'О': 16, 'П': 17, 'Р': 18, 'С': 19, 'Т': 20,
		  'У': 21, 'Ф': 22, 'Х': 23, 'Ц': 24, 'Ч': 25, 'Ш': 26, 'Щ': 27, 'Ъ': 28, 'Ы': 29, 'Ь': 30,
		  'Э': 31, 'Ю': 32, 'Я': 33, 'а': 34, 'б': 35, 'в': 36, 'г': 37, 'д': 38, 'е': 39, 'ё': 40,
		  'ж': 41, 'з': 42, 'и': 43, 'й': 44, 'к': 45, 'л': 46, 'м': 47, 'н': 48, 'о': 49, 'п': 50,
		  'р': 51, 'с': 52, 'т': 53, 'у': 54, 'ф': 55, 'х': 56, 'ц': 57, 'ч': 58, 'ш': 59, 'щ': 60,
		  'ъ': 61, 'ы': 62, 'ь': 63, 'э': 64, 'ю': 65, 'я': 66, ',': 67, '.': 68, '!': 69, '?': 70,
		  '-': 71, '=': 72, ' ': 73
		};


		function decryptText() {

			let rawtext = location.search.replaceAll('%D0%90', 'А')
			.replaceAll('%D0%91', 'Б')
			.replaceAll('%D0%92', 'В')
			.replaceAll('%D0%93', 'Г')
			.replaceAll('%D0%94', 'Д')
			.replaceAll('%D0%95', 'Е')
			.replaceAll('%D0%81', 'Ё')
			.replaceAll('%D0%96', 'Ж')
			.replaceAll('%D0%97', 'З')
			.replaceAll('%D0%98', 'И')
			.replaceAll('%D0%99', 'Й')
			.replaceAll('%D0%9A', 'К')
			.replaceAll('%D0%9B', 'Л')
			.replaceAll('%D0%9C', 'М')
			.replaceAll('%D0%9D', 'Н')
			.replaceAll('%D0%9E', 'О')
			.replaceAll('%D0%9F', 'П')
			.replaceAll('%D0%A0', 'Р')
			.replaceAll('%D0%A1', 'С')
			.replaceAll('%D0%A2', 'Т')
			.replaceAll('%D0%A3', 'У')
			.replaceAll('%D0%A4', 'Ф')
			.replaceAll('%D0%A5', 'Х')
			.replaceAll('%D0%A6', 'Ц')
			.replaceAll('%D0%A7', 'Ч')
			.replaceAll('%D0%A8', 'Ш')
			.replaceAll('%D0%A9', 'Щ')
			.replaceAll('%D0%AA', 'Ъ')
			.replaceAll('%D0%AB', 'Ы')
			.replaceAll('%D0%AC', 'Ь')
			.replaceAll('%D0%AD', 'Э')
			.replaceAll('%D0%AE', 'Ю')
			.replaceAll('%D0%AF', 'Я')
			.replaceAll('%D0%B0', 'а')
			.replaceAll('%D0%B1', 'б')
			.replaceAll('%D0%B2', 'в')
			.replaceAll('%D0%B3', 'г')
			.replaceAll('%D0%B4', 'д')
			.replaceAll('%D0%B5', 'е')
			.replaceAll('%D1%91', 'ё')
			.replaceAll('%D0%B6', 'ж')
			.replaceAll('%D0%B7', 'з')
			.replaceAll('%D0%B8', 'и')
			.replaceAll('%D0%B9', 'й')
			.replaceAll('%D0%BA', 'к')
			.replaceAll('%D0%BB', 'л')
			.replaceAll('%D0%BC', 'м')
			.replaceAll('%D0%BD', 'н')
			.replaceAll('%D0%BE', 'о')
			.replaceAll('%D0%BF', 'п')
			.replaceAll('%D1%80', 'р')
			.replaceAll('%D1%81', 'с')
			.replaceAll('%D1%82', 'т')
			.replaceAll('%D1%83', 'у')
			.replaceAll('%D1%84', 'ф')
			.replaceAll('%D1%85', 'х')
			.replaceAll('%D1%86', 'ц')
			.replaceAll('%D1%87', 'ч')
			.replaceAll('%D1%88', 'ш')
			.replaceAll('%D1%89', 'щ')
			.replaceAll('%D1%8A', 'ъ')
			.replaceAll('%D1%8B', 'ы')
			.replaceAll('%D1%8C', 'ь')
			.replaceAll('%D1%8D', 'э')
			.replaceAll('%D1%8E', 'ю')
			.replaceAll('%D1%8F', 'я')
			.replaceAll('%20', ' ')

			let info =  rawtext.split("&");
			let shift = parseInt(info.pop().slice(2));
			let encryptedText = info.pop().slice(6);

			let decryptedText = '';

			for (let i = 0; i < encryptedText.length; i++) {

				let char = encryptedText[i];
				let charCode = customCharCodes[char];

				if (charCode) {
					let newCharCode = charCode - shift;

					if (newCharCode < 1) {
						newCharCode = 73 - Math.abs(newCharCode);
					}

					let decryptedChar = Object.keys(customCharCodes).find(key => customCharCodes[key] === newCharCode);

				    decryptedText +=  decryptedChar;

				  } else {
					decryptedText += char;
				}
			}

			let textField = document.getElementById("output");
			textField.innerHTML += decryptedText;

			if (textField.style.display === 'none') {
				textField.style.display = 'block';
			} else {
			    textField.style.display = 'none';
			}
		}

		</script>
</body>

</html>