☰

4chan Base64 Decode Tool

appears in the thread page. auto recursive decoding if the message is coded multiple times.

当前为 2022-01-22 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name         4chan Base64 Decode Tool
  3. // @namespace    https://github.com/x94fujo6rpg/SomeTampermonkeyScripts
  4. // @version      0.01
  5. // @description  appears in the thread page. auto recursive decoding if the message is coded multiple times.
  6. // @author       x94fujo6
  7. // @match        https://boards.4chan.org/*/thread/*
  8. // @match        https://boards.4channel.org/*/thread/*
  9. // ==/UserScript==
  10. /* jshint esversion: 9 */
  11.  
  12. (function () {
  13. 	let
  14. 		elem = {
  15. 			tool: "decode_tool",
  16. 			in: "decode_input",
  17. 			out: "decode_output",
  18. 			decode: "decode_shit",
  19. 			copy: "decode_copy",
  20. 			open: "decode_open",
  21. 			close: "decode_close",
  22. 		},
  23. 		box = document.createElement("div"),
  24. 		class_list = {
  25. 			title: "usTitle",
  26. 			box: "usBox",
  27. 			t: "usTextBox",
  28. 			b: "usButton line-2-item",
  29. 		},
  30. 		getIn = () => document.getElementById(elem.in).value,
  31. 		getOut = () => document.getElementById(elem.out).value,
  32. 		setIn = (t = "") => document.getElementById(elem.in).value = t,
  33. 		setOut = (t = "") => document.getElementById(elem.out).value = t,
  34. 		decode_text = () => {
  35. 			let text = getIn(),
  36. 				count = 0,
  37. 				max = 100,
  38. 				[err, output] = decoder(text),
  39. 				last_output = output,
  40. 				err_msg = "decode failed";
  41. 			setIn();
  42. 			console.log(count, text);
  43. 			if (err) {
  44. 				setOut(err_msg);
  45. 				console.log(err_msg);
  46. 			}
  47. 			while (!err && output.length && count < max) {
  48. 				count++;
  49. 				console.log(count, last_output);
  50. 				setOut(last_output);
  51. 				[err, output] = decoder(last_output);
  52. 				if (err) {
  53. 					console.log("end loop");
  54. 					break;
  55. 				} else {
  56. 					setIn(last_output);
  57. 					last_output = output;
  58. 				}
  59. 			}
  60.  
  61. 			function decoder(_t = "") {
  62. 				let out = false,
  63. 					error = false;
  64. 				try {
  65. 					out = atob(_t);
  66. 				} catch (e) {
  67. 					error = e;
  68. 				} finally {
  69. 					return [error, out];
  70. 				}
  71. 			}
  72. 		},
  73. 		copy = () => {
  74. 			let text = document.getElementById(elem.out);
  75. 			text.select();
  76. 			text.setSelectionRange(0, 99999);
  77. 			document.execCommand("copy");
  78. 		},
  79. 		open = () => document.getElementById(elem.tool).style.display = "",
  80. 		close = () => document.getElementById(elem.tool).style.display = "none";
  81.  
  82. 	box.className = class_list.box;
  83. 	box.innerHTML = `
  84. 		<div class="${class_list.title}">Base64 Decode Tool</div>
  85. 		<div id="${elem.tool}" style="display: none;">
  86. 			<button type="button" id="${elem.decode}" class="${class_list.b}">Decode Input</button>
  87. 			<button type="button" id="${elem.copy}" class="${class_list.b}">Copy Output</button>
  88. 			<textarea id="${elem.in}" class="${class_list.t}" rows="10" cols="70" placeholder="input"></textarea>
  89. 			<textarea id="${elem.out}" class="${class_list.t}" rows="10" cols="70" placeholder="output"></textarea>
  90. 		</div>
  91. 		<button type="button" id="${elem.open}" class="${class_list.b}">Open</button>
  92. 		<button type="button" id="${elem.close}" class="${class_list.b}">Close</button>
  93. 	`;
  94. 	addCss();
  95. 	document.body.appendChild(box);
  96. 	document.getElementById(elem.decode).onclick = () => decode_text(false);
  97. 	document.getElementById(elem.copy).onclick = () => copy();
  98. 	document.getElementById(elem.open).onclick = () => open();
  99. 	document.getElementById(elem.close).onclick = () => close();
  100.  
  101. 	function addCss() {
  102. 		let s = document.createElement("style");
  103. 		document.head.appendChild(s);
  104. 		s.textContent = `
  105. 			.usTitle {
  106. 				display: block;
  107. 				font-size: large;
  108. 				margin: auto;
  109. 				width: 20rem;
  110. 				padding: 0.5rem;
  111. 			}
  112.  
  113. 			.usBox {
  114. 				position: fixed;
  115. 				bottom: 1rem;
  116. 				right: 1rem;
  117. 				z-index: 100;
  118. 				border: 2px ridge rgba(0, 0, 0, 0.3);
  119. 				background-color: rgba(255, 255, 255, 0.75);
  120. 				display: block;
  121. 				width: max-content;
  122. 				height: max-content;
  123. 				text-align: center;
  124. 			}
  125.  
  126. 			.usTextBox {
  127. 				display: flex;
  128. 				width: 95%;
  129. 				height: 35%;
  130. 				margin: 0.2rem auto;
  131. 				word-break: break-all;
  132. 			}
  133.  
  134. 			.usButton {
  135. 				display: inline;
  136. 				margin: 0.25rem;
  137. 				padding: 0.5rem;
  138. 				text-align: center;
  139. 				font-size: large;
  140. 			}
  141.  
  142. 			.line-2-item {
  143. 				max-width: 100%;
  144. 				width: calc(90% / 2);
  145. 			}
  146. 		`;
  147. 	}
  148. })();