Webページに「Mastodonで記事をシェア」ボタンを設置するコード

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Result


表題の通りで、任意の記事をユーザーにMastodonで投稿して貰う為の共有ボタンを設置する、というもの。

当然問題となるのがユーザーによるインスタンスの違いですが、この方法ではインスタンスをユーザーに入力して貰う形となっています。

JavaScript

// DOMからリンクを取得
const button = document.querySelector('.mastodon-share');
 
// ユーザーがリンクをクリックすると
button.addEventListener('click', (e) => {
 
// ユーザーがすでにインスタンスに入っており且つ、その情報がlocalStorageにある場合
// インスタンスと現在のページのタイトルとURLを含むリンク href を書き出す
if(localStorage.getItem('mastodon-instance')) {
  button.href = `
    https://${localStorage.getItem('mastodon-instance')}/
    share?text=${encodeURIComponent(document.title)}
    %0A${encodeURIComponent(location.href)}
  `;
// それ以外の場合はユーザーにインスタンスの入力をして貰いlocalStorageに保存
} else {
    e.preventDefault();
    let instance = window.prompt(
      'Please tell me your Mastodon instance'
    );
    localStorage.setItem('mastodon-instance', instance);
}
});

これはクリックでインスタンスの指示を促す方法。おそらくもっともシンプルな方法です。
ただ、シェアボタンの挙動としてはちょっとアレなので他SNSと概ね似たようなボタンを今回は作る、という話です。

ボタン化には以下のようなコードが使われています。

Array.prototype.forEach ||
	(Array.prototype.forEach = function (r) {
		var o, t;
		if (null == this) throw new TypeError("this is null or not defined");
		var n = Object(this),
			e = n.length >>> 0;
		if ("function" != typeof r) throw new TypeError(r + " is not a function");
		for (arguments.length > 1 && (o = arguments[1]), t = 0; t < e; ) {
			var i;
			t in n && ((i = n[t]), r.call(o, i, t, n)), t++;
		}
	});
document.addEventListener("DOMContentLoaded", function () {
	document.querySelectorAll(".mast-share").forEach(function (e, t) {
		(e.querySelector(".mast-check-toggle").id = "mast-check-toggle-" + t),
			(e.querySelector(".mast-check-label").htmlFor = "mast-check-toggle-" + t),
			e
				.querySelector(".mast-share-button")
				.addEventListener("click", function (t) {
					var a = new RegExp(
							"^(?:(?:https?|ftp)://)?(?:\\S+(?::\\S*)?@|\\d{1,3}(?:\\.\\d{1,3}){3}|(?:(?:[a-z\\d\\u00a1-\\uffff]+-?)*[a-z\\d\\u00a1-\\uffff]+)(?:\\.(?:[a-z\\d\\u00a1-\\uffff]+-?)*[a-z\\d\\u00a1-\\uffff]+)*(?:\\.[a-z\\u00a1-\\uffff]{2,6}))(?::\\d+)?(?:[^\\s]*)?$",
							"i"
						),
						n = e.querySelector('input[name="mast-instance-input"]');
					if (a.test(n.value)) {
						var o = `http://${n.value.replace(
							/(^\w+:|^)\/\//,
							""
						)}/share?text=${encodeURIComponent(document.title)} ${encodeURIComponent(
							location.href
						)}`;
						window.open(
							o,
							"new",
							"toolbar=no,location=no,status=yes,resizable=yes,scrollbars=yes,height=600,width=400"
						);
					} else
						n.classList.add("invalid"),
							setTimeout(function () {
								n.classList.remove("invalid");
							}, 300);
				}),
			e.addEventListener("mouseleave", function (t) {
				e.querySelector(".mast-check-toggle").checked = !1;
			});
	});
});

css

.mast-check-toggle {
	height: 0;
	width: 0;
	padding: 0;
	margin: 0;
	visibility: hidden;
	display: none;
}
.mast-check-toggle:checked + .mast-instance {
	display: block !important;
}
.mast-check-toggle:not(:checked) + .mast-instance {
	display: none;
}
.mast-share.active {
	padding-bottom: 10px;
}
.mast-share-lg .mast-top {
	cursor: pointer;
	position: absolute;
	width: 142px;
	top: 0;
	left: 0;
	padding: 4px 8px;
	z-index: 1;
}
.mast-share-md .mast-top,
.mast-share-sm .mast-top {
	cursor: pointer;
	position: absolute;
	width: 18px;
	height: 15px;
	top: 0;
	left: 0;
	padding: 4px 8px;
	z-index: 1;
}
.mast-share-lg,
.mast-share-md,
.mast-share-sm {
	color: #fff;
	display: inline-block;
	height: 23px;
	background-color: #292d37;
	border-radius: 3px;
	position: relative;
}
.mast-share-lg {
	width: 158px;
}
.mast-share-md {
	width: 92px;
}
.mast-share-sm {
	width: 34px;
}
.mast-share-md .mast-instance,
.mast-share-sm .mast-instance {
	border-radius: 0 3px 3px;
	z-index: 0;
}
.mast-instance {
	background-color: #292d37;
	padding: 8px;
	position: absolute;
	top: 20px;
	left: 0;
	margin: 0 auto;
	border-radius: 0 0 3px 3px;
}
.mast-share span {
	vertical-align: top;
	font-family: sans-serif;
	font-weight: 700;
	font-size: 14px;
}
.mast-share img {
	max-height: 19px;
	margin-top: 1px;
}
.mast-instance input[name="mast-instance-input"] {
	background-color: #00000000;
	border: none;
	color: #fff;
	border-bottom: 2px solid #3087d5;
	font-size: 14px;
	font-weight: 700;
	max-width: 130px;
}
.mast-instance input[name="mast-instance-input"][class="invalid"] {
	border-bottom: 2px solid red;
	animation-name: shake;
	animation-duration: 0.1s;
	animation-timing-function: ease-in-out;
	animation-iteration-count: infinite;
}
@-webkit-keyframes shake {
	41%,
	8% {
		-webkit-transform: translateX(-10px);
	}
	25%,
	58% {
		-webkit-transform: translateX(10px);
	}
	75% {
		-webkit-transform: translateX(-5px);
	}
	92% {
		-webkit-transform: translateX(5px);
	}
	0%,
	100% {
		-webkit-transform: translateX(0);
	}
}
.mast-share input::placeholder {
	color: #eee;
}
.mast-share input:focus {
	outline: 0;
}
.mast-share button {
	background-color: #00000000;
	color: #fff;
	border: none;
	font-size: 14px;
	font-weight: 700;
	padding: 0;
	margin: 8px 0 0;
	cursor: pointer;
}
.mast-share button:hover {
	color: #3087d5;
}

こちらはボタンやインスタンス入力フォームなどのスタイルとなっています。

ですので、ボタンのスタイルを変更したい場合はこのCSSを編集します。

html

<div class="mast-share mast-share-sm"> <input type="checkbox" class="mast-check-toggle"> <div class="mast-instance"><span>インスタンスを入力: </span><input type="textbox" name="mast-instance-input" placeholder="mstdn.jp"><button class="mast-share-button">シェア</button></div> <label class="mast-top mast-check-label"> <img src="data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2261.076954mm%22%20height%3D%2265.47831mm%22%20viewBox%3D%220%200%20216.4144%20232.00976%22%3E%3Cpath%20d%3D%22M211.80734%20139.0875c-3.18125%2016.36625-28.4925%2034.2775-57.5625%2037.74875-15.15875%201.80875-30.08375%203.47125-45.99875%202.74125-26.0275-1.1925-46.565-6.2125-46.565-6.2125%200%202.53375.15625%204.94625.46875%207.2025%203.38375%2025.68625%2025.47%2027.225%2046.39125%2027.9425%2021.11625.7225%2039.91875-5.20625%2039.91875-5.20625l.8675%2019.09s-14.77%207.93125-41.08125%209.39c-14.50875.7975-32.52375-.365-53.50625-5.91875C9.23234%20213.82%201.40609%20165.31125.20859%20116.09125c-.365-14.61375-.14-28.39375-.14-39.91875%200-50.33%2032.97625-65.0825%2032.97625-65.0825C49.67234%203.45375%2078.20359.2425%20107.86484%200h.72875c29.66125.2425%2058.21125%203.45375%2074.8375%2011.09%200%200%2032.975%2014.7525%2032.975%2065.0825%200%200%20.41375%2037.13375-4.59875%2062.915%22%20fill%3D%22%233088d4%22%2F%3E%3Cpath%20d%3D%22M177.50984%2080.077v60.94125h-24.14375v-59.15c0-12.46875-5.24625-18.7975-15.74-18.7975-11.6025%200-17.4175%207.5075-17.4175%2022.3525v32.37625H96.20734V85.42325c0-14.845-5.81625-22.3525-17.41875-22.3525-10.49375%200-15.74%206.32875-15.74%2018.7975v59.15H38.90484V80.077c0-12.455%203.17125-22.3525%209.54125-29.675%206.56875-7.3225%2015.17125-11.07625%2025.85-11.07625%2012.355%200%2021.71125%204.74875%2027.8975%2014.2475l6.01375%2010.08125%206.015-10.08125c6.185-9.49875%2015.54125-14.2475%2027.8975-14.2475%2010.6775%200%2019.28%203.75375%2025.85%2011.07625%206.36875%207.3225%209.54%2017.22%209.54%2029.675%22%20fill%3D%22%23fff%22%2F%3E%3C%2Fsvg%3E%0A"> </label> </div> <script>Array.prototype.forEach||(Array.prototype.forEach=function(r){var o,t;if(null==this)throw new TypeError("this is null or not defined");var n=Object(this),e=n.length>>>0;if("function"!=typeof r)throw new TypeError(r+" is not a function");for(arguments.length>1&&(o=arguments[1]),t=0;t<e;){var i;t in n&&(i=n[t],r.call(o,i,t,n)),t++}});document.addEventListener("DOMContentLoaded",function(){document.querySelectorAll(".mast-share").forEach(function(e,t){e.querySelector(".mast-check-toggle").id="mast-check-toggle-"+t,e.querySelector(".mast-check-label").htmlFor="mast-check-toggle-"+t,e.querySelector(".mast-share-button").addEventListener("click",function(t){var a=new RegExp("^(?:(?:https?|ftp)://)?(?:\\S+(?::\\S*)?@|\\d{1,3}(?:\\.\\d{1,3}){3}|(?:(?:[a-z\\d\\u00a1-\\uffff]+-?)*[a-z\\d\\u00a1-\\uffff]+)(?:\\.(?:[a-z\\d\\u00a1-\\uffff]+-?)*[a-z\\d\\u00a1-\\uffff]+)*(?:\\.[a-z\\u00a1-\\uffff]{2,6}))(?::\\d+)?(?:[^\\s]*)?$","i"),n=e.querySelector('input[name="mast-instance-input"]');if(a.test(n.value)){var o=`http://${n.value.replace(/(^\w+:|^)\/\//,"")}/share?text=${encodeURIComponent(document.title)} ${encodeURIComponent(location.href)}`;window.open(o,"new","toolbar=no,location=no,status=yes,resizable=yes,scrollbars=yes,height=600,width=400")}else n.classList.add("invalid"),setTimeout(function(){n.classList.remove("invalid")},300)}),e.addEventListener("mouseleave",function(t){e.querySelector(".mast-check-toggle").checked=!1})})});</script> <style>.mast-check-toggle{height:0;width:0;padding:0;margin:0;visibility:hidden;display:none}.mast-check-toggle:checked+.mast-instance{display:block!important}.mast-check-toggle:not(:checked)+.mast-instance{display:none}.mast-share.active{padding-bottom:10px}.mast-share-lg .mast-top{cursor:pointer;position:absolute;width:142px;top:0;left:0;padding:4px 8px;z-index:1}.mast-share-md .mast-top,.mast-share-sm .mast-top{cursor:pointer;position:absolute;width:18px;height:15px;top:0;left:0;padding:4px 8px;z-index:1}.mast-share-lg,.mast-share-md,.mast-share-sm{color:#fff;display:inline-block;height:23px;background-color:#292D37;border-radius:3px;position:relative}.mast-share-lg{width:158px}.mast-share-md{width:92px}.mast-share-sm{width:34px}.mast-share-md .mast-instance,.mast-share-sm .mast-instance{border-radius:0 3px 3px;z-index:0}.mast-instance{background-color:#292D37;padding:8px;position:absolute;top:20px;left:0;margin:0 auto;border-radius:0 0 3px 3px}.mast-share span{vertical-align:top;font-family:sans-serif;font-weight:700;font-size:14px}.mast-share img{max-height:19px;margin-top:1px}.mast-instance input[name="mast-instance-input"]{background-color:#00000000;border:none;color:#fff;border-bottom:2px solid #3087D5;font-size:14px;font-weight:700;max-width:130px}.mast-instance input[name="mast-instance-input"][class="invalid"]{border-bottom:2px solid red;animation-name:shake;animation-duration:.1s;animation-timing-function:ease-in-out;animation-iteration-count:infinite}@-webkit-keyframes shake{41%,8%{-webkit-transform:translateX(-10px)}25%,58%{-webkit-transform:translateX(10px)}75%{-webkit-transform:translateX(-5px)}92%{-webkit-transform:translateX(5px)}0%,100%{-webkit-transform:translateX(0)}}.mast-share input::placeholder{color:#eee;}.mast-share input:focus{outline:0}.mast-share button{background-color:#00000000;color:#fff;border:none;font-size:14px;font-weight:700;padding:0;margin:8px 0 0;cursor:pointer}.mast-share button:hover{color:#3087d5}</style>

HTMLの他に先ほどのJavaScript、CSSを含めたコードです。

このコードのコピーで、「Mastodonで記事をシェア」ボタンを設置する事が出来ます。

JavaScript及びCSSはCDNにもあるみたいなので以下のようにコードを短くする事も可能です。

<div class="mast-share mast-share-sm"> <input type="checkbox" class="mast-check-toggle"> <div class="mast-instance"><span>インスタンスを入力: </span><input type="textbox" name="mast-instance-input" placeholder="mstdn.jp"><button class="mast-share-button">シェア</button></div> <label class="mast-top mast-check-label"> <img src="logotype-short.svg"> </label> </div> <script src="https://cdn.rawgit.com/grayleonard/mastodon-share/35d4e3ab/mast-share.min.js"></script> <link rel="stylesheet" href="https://cdn.rawgit.com/grayleonard/mastodon-share/35d4e3ab/mast-share.min.css">

via

以下で詳しく解説されています。
Adding a “share to mastodon” link to any web site – and here

またコードはGithubで公開されています。

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