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start-nostr-protocol-with-devtools.html
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start-nostr-protocol-with-devtools.html
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<!DOCTYPE html><html lang="ja-JP"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width,height=device-height,initial-scale=1.0"><meta name="apple-mobile-web-app-capable" content="yes"><meta http-equiv="X-UA-Compatible" content="ie=edge"><meta property="og:type" content="website"><meta name="twitter:card" content="summary"><style>@media screen{body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container button{-webkit-tap-highlight-color:transparent;-webkit-appearance:none;appearance:none;background-color:transparent;border:0;color:inherit;cursor:pointer;font-size:inherit;opacity:.8;outline:none;padding:0;transition:opacity .2s linear}body[data-bespoke-view=""] 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/*!
* Marp default theme.
*
* @theme default
* @author Yuki Hattori
*
* @auto-scaling true
* @size 16:9 1280px 720px
* @size 4:3 960px 720px
*/div#p>svg>foreignObject>section{--color-prettylights-syntax-comment:#6e7781;--color-prettylights-syntax-constant:#0550ae;--color-prettylights-syntax-entity:#8250df;--color-prettylights-syntax-storage-modifier-import:#24292f;--color-prettylights-syntax-entity-tag:#116329;--color-prettylights-syntax-keyword:#cf222e;--color-prettylights-syntax-string:#0a3069;--color-prettylights-syntax-variable:#953800;--color-prettylights-syntax-brackethighlighter-unmatched:#82071e;--color-prettylights-syntax-invalid-illegal-text:#f6f8fa;--color-prettylights-syntax-invalid-illegal-bg:#82071e;--color-prettylights-syntax-carriage-return-text:#f6f8fa;--color-prettylights-syntax-carriage-return-bg:#cf222e;--color-prettylights-syntax-string-regexp:#116329;--color-prettylights-syntax-markup-list:#3b2300;--color-prettylights-syntax-markup-heading:#0550ae;--color-prettylights-syntax-markup-italic:#24292f;--color-prettylights-syntax-markup-bold:#24292f;--color-prettylights-syntax-markup-deleted-text:#82071e;--color-prettylights-syntax-markup-deleted-bg:#ffebe9;--color-prettylights-syntax-markup-inserted-text:#116329;--color-prettylights-syntax-markup-inserted-bg:#dafbe1;--color-prettylights-syntax-markup-changed-text:#953800;--color-prettylights-syntax-markup-changed-bg:#ffd8b5;--color-prettylights-syntax-markup-ignored-text:#eaeef2;--color-prettylights-syntax-markup-ignored-bg:#0550ae;--color-prettylights-syntax-meta-diff-range:#8250df;--color-prettylights-syntax-brackethighlighter-angle:#57606a;--color-prettylights-syntax-sublimelinter-gutter-mark:#8c959f;--color-prettylights-syntax-constant-other-reference-link:#0a3069;--color-fg-default:#24292f;--color-fg-muted:#57606a;--color-fg-subtle:#6e7781;--color-canvas-default:#fff;--color-canvas-subtle:#f6f8fa;--color-border-default:#d0d7de;--color-border-muted:#d8dee4;--color-neutral-muted:rgba(175,184,193,.2);--color-accent-fg:#0969da;--color-accent-emphasis:#0969da;--color-attention-subtle:#fff8c5;--color-danger-fg:#cf222e;color-scheme:light}div#p>svg>foreignObject>section:where(.invert){--color-prettylights-syntax-comment:#8b949e;--color-prettylights-syntax-constant:#79c0ff;--color-prettylights-syntax-entity:#d2a8ff;--color-prettylights-syntax-storage-modifier-import:#c9d1d9;--color-prettylights-syntax-entity-tag:#7ee787;--color-prettylights-syntax-keyword:#ff7b72;--color-prettylights-syntax-string:#a5d6ff;--color-prettylights-syntax-variable:#ffa657;--color-prettylights-syntax-brackethighlighter-unmatched:#f85149;--color-prettylights-syntax-invalid-illegal-text:#f0f6fc;--color-prettylights-syntax-invalid-illegal-bg:#8e1519;--color-prettylights-syntax-carriage-return-text:#f0f6fc;--color-prettylights-syntax-carriage-return-bg:#b62324;--color-prettylights-syntax-string-regexp:#7ee787;--color-prettylights-syntax-markup-list:#f2cc60;--color-prettylights-syntax-markup-heading:#1f6feb;--color-prettylights-syntax-markup-italic:#c9d1d9;--color-prettylights-syntax-markup-bold:#c9d1d9;--color-prettylights-syntax-markup-deleted-text:#ffdcd7;--color-prettylights-syntax-markup-deleted-bg:#67060c;--color-prettylights-syntax-markup-inserted-text:#aff5b4;--color-prettylights-syntax-markup-inserted-bg:#033a16;--color-prettylights-syntax-markup-changed-text:#ffdfb6;--color-prettylights-syntax-markup-changed-bg:#5a1e02;--color-prettylights-syntax-markup-ignored-text:#c9d1d9;--color-prettylights-syntax-markup-ignored-bg:#1158c7;--color-prettylights-syntax-meta-diff-range:#d2a8ff;--color-prettylights-syntax-brackethighlighter-angle:#8b949e;--color-prettylights-syntax-sublimelinter-gutter-mark:#484f58;--color-prettylights-syntax-constant-other-reference-link:#a5d6ff;--color-fg-default:#c9d1d9;--color-fg-muted:#8b949e;--color-fg-subtle:#6e7681;--color-canvas-default:#0d1117;--color-canvas-subtle:#161b22;--color-border-default:#30363d;--color-border-muted:#21262d;--color-neutral-muted:hsla(215,8%,47%,.4);--color-accent-fg:#58a6ff;--color-accent-emphasis:#1f6feb;--color-attention-subtle:rgba(187,128,9,.15);--color-danger-fg:#f85149;color-scheme:dark}div#p>svg>foreignObject>section{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;word-wrap:break-word;background-color:var(--color-canvas-default);color:var(--color-fg-default);font-family:-apple-system,BlinkMacSystemFont,Segoe 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:where(.hljs-title.class_),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-title.class_.inherited__),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-title.function_){color:var(--color-prettylights-syntax-entity)}div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-attr),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-attribute),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-literal),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-meta),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-number),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-operator),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-selector-attr),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-selector-class),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-selector-id),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-variable){color:var(--color-prettylights-syntax-constant)}div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-meta .hljs-string),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-regexp),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-string){color:var(--color-prettylights-syntax-string)}div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-built_in),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-symbol){color:var(--color-prettylights-syntax-variable)}div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-code),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-comment),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-formula){color:var(--color-prettylights-syntax-comment)}div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-name),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-quote),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-selector-pseudo),div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-selector-tag){color:var(--color-prettylights-syntax-entity-tag)}div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-subst){color:var(--color-prettylights-syntax-storage-modifier-import)}div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-section){color:var(--color-prettylights-syntax-markup-heading);font-weight:700}div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-bullet){color:var(--color-prettylights-syntax-markup-list)}div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-emphasis){color:var(--color-prettylights-syntax-markup-italic);font-style:italic}div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-strong){color:var(--color-prettylights-syntax-markup-bold);font-weight:700}div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-addition){background-color:var(--color-prettylights-syntax-markup-inserted-bg);color:var(--color-prettylights-syntax-markup-inserted-text)}div#p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-deletion){background-color:var(--color-prettylights-syntax-markup-deleted-bg);color:var(--color-prettylights-syntax-markup-deleted-text)}div#p>svg>foreignObject>section footer,div#p>svg>foreignObject>section header{color:var(--header-footer-color);font-size:18px;left:30px;margin:0;position:absolute}div#p>svg>foreignObject>section header{top:21px}div#p>svg>foreignObject>section footer{bottom:21px}div#p>svg>foreignObject>section{--h1-color:#246;--header-footer-color:hsla(0,0%,40%,.75);--heading-strong-color:#48c;--paginate-color:#777;align-items:stretch;display:flex;flex-flow:column nowrap;font-size:29px;height:720px;justify-content:center;padding:78.5px;width:1280px}div#p>svg>foreignObject>section{--marpit-root-font-size:29px}div#p>svg>foreignObject>section:where(.invert){--h1-color:#cee7ff;--header-footer-color:hsla(0,0%,60%,.75);--heading-strong-color:#7bf;--paginate-color:#999}div#p>svg>foreignObject>section>:last-child,div#p>svg>foreignObject>section[data-footer]>:nth-last-child(2){margin-bottom:0}div#p>svg>foreignObject>section>:first-child,div#p>svg>foreignObject>section>header:first-child+*{margin-top:0}div#p>svg>foreignObject>section:after{bottom:21px;color:var(--paginate-color);font-size:24px;padding:0;position:absolute;right:30px}div#p>svg>foreignObject>section:after{--marpit-root-font-size:24px}div#p>svg>foreignObject>section[data-color] :is(h1,marp-h1),div#p>svg>foreignObject>section[data-color] :is(h2,marp-h2),div#p>svg>foreignObject>section[data-color] :is(h3,marp-h3),div#p>svg>foreignObject>section[data-color] :is(h4,marp-h4),div#p>svg>foreignObject>section[data-color] :is(h5,marp-h5),div#p>svg>foreignObject>section[data-color] :is(h6,marp-h6){color:currentcolor}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]{columns:initial!important;display:block!important;padding:0!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]:after,div#p>svg>foreignObject>section[data-marpit-advanced-background=background]:before,div#p>svg>foreignObject>section[data-marpit-advanced-background=content]:after,div#p>svg>foreignObject>section[data-marpit-advanced-background=content]:before{display:none!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]{all:initial;display:flex;flex-direction:row;height:100%;overflow:hidden;width:100%}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container][data-marpit-advanced-background-direction=vertical]{flex-direction:column}div#p>svg>foreignObject>section[data-marpit-advanced-background=background][data-marpit-advanced-background-split]>div[data-marpit-advanced-background-container]{width:var(--marpit-advanced-background-split,50%)}div#p>svg>foreignObject>section[data-marpit-advanced-background=background][data-marpit-advanced-background-split=right]>div[data-marpit-advanced-background-container]{margin-left:calc(100% - var(--marpit-advanced-background-split, 50%))}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]>figure{all:initial;background-position:center;background-repeat:no-repeat;background-size:cover;flex:auto;margin:0}div#p>svg>foreignObject>section[data-marpit-advanced-background=content],div#p>svg>foreignObject>section[data-marpit-advanced-background=pseudo]{background:transparent!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=pseudo],div#p>svg[data-marpit-svg]>foreignObject[data-marpit-advanced-background=pseudo]{pointer-events:none!important}div#p>svg>foreignObject>section[data-marpit-advanced-background-split]{width:100%;height:100%}</style><title>DevToolsではじめる簡単Nostrプロトコル (Nostr勉強会 #0)</title></head><body><div class="bespoke-marp-osc"><button data-bespoke-marp-osc="prev" tabindex="-1" title="Previous slide">Previous slide</button><span data-bespoke-marp-osc="page"></span><button data-bespoke-marp-osc="next" tabindex="-1" title="Next slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id="p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="1" data-paginate="true" data-marpit-pagination="1" data-marpit-pagination-total="18" style="--paginate:true;">
<h1>DevToolsではじめる簡単Nostrプロトコル</h1>
<p>あすらも / heguro</p>
<ul>
<li><code>npub1jw4e8qh6vmyq0n2tkupv7wlfu5h59luk98dcfedf03anh5ek5jkq936u57</code></li>
<li><a href="https://iris.to/[email protected]">https://iris.to/[email protected]</a></li>
</ul>
<p>「Nostr勉強会 #0」より</p>
<ul>
<li><a href="https://428lab.connpass.com/event/275748/">https://428lab.connpass.com/event/275748/</a></li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2" data-paginate="true" data-marpit-pagination="2" data-marpit-pagination-total="18" style="--paginate:true;">
<h2>今回の資料・ソースコード</h2>
<p><a href="https://github.com/heguro/nostr-meeting-20230222">https://github.com/heguro/nostr-meeting-20230222</a></p>
<p>PCでご覧のかたは、是非一緒にDevToolsを開いて動かしてみてください！</p>
<p>※YouTubeのページはコンソールのログが流れやすいので、<br />
新しいタブで「<a href="about:blank">about:blank</a>」というURLを開いてからコンソールを開いて<br />
作業することをオススメします！</p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3" data-paginate="true" data-footer="ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から" data-marpit-pagination="3" data-marpit-pagination-total="18" style="--paginate:true;--footer:ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から;">
<h2>Nostr プロトコルでの開発がいかに簡単か</h2>
<p>始めるのは非常に簡単</p>
<p>なぜか</p>
<ul>
<li>すべてがWebSocketで動いてる！！！
<ul>
<li>（WebSocket: ブラウザなどで使えるリアルタイム双方向通信の規格）</li>
</ul>
</li>
<li>Twitterや各種SNSで定番の「APIキーを取得する」作業すら不要</li>
<li>仕様が一カ所にまとまっていて、単純明快
<ul>
<li><a href="https://github.com/nostr-protocol/nips">https://github.com/nostr-protocol/nips</a></li>
<li>日本語 → <a href="https://scrapbox.io/nostr/NIP">https://scrapbox.io/nostr/NIP</a></li>
</ul>
</li>
</ul>
<footer>ソースコードは <code>https://github.com/heguro/nostr-meeting-20230222</code> から</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4" data-paginate="true" data-footer="ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から" data-marpit-pagination="4" data-marpit-pagination-total="18" style="--paginate:true;--footer:ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から;">
<h2>例: ある人の最新の投稿を 10 件取得する</h2>
<ol>
<li>WebSocketでリレーサーバーに接続</li>
<li>以下のメッセージを送る</li>
</ol>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-json"><span class="hljs-punctuation">[</span> <span class="hljs-string">"REQ"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"購読ID"</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"pubkey"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"その人の公開鍵"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"kinds"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span><span class="hljs-number">1</span><span class="hljs-punctuation">]</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"limit"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">10</span> <span class="hljs-punctuation">}</span> <span class="hljs-punctuation">]</span>
</code></pre>
<ol start="3">
<li>投稿内容を含んだメッセージが返ってくる！！</li>
</ol>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-json"><span class="hljs-punctuation">[</span> <span class="hljs-string">"EVENT"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"購読ID"</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span> <投稿内容> <span class="hljs-punctuation">}</span> <span class="hljs-punctuation">]</span>
</code></pre>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-json"><span class="hljs-punctuation">[</span> <span class="hljs-string">"EVENT"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"購読ID"</span><span class="hljs-punctuation">,</span> <span class="hljs-punctuation">{</span> <投稿内容> <span class="hljs-punctuation">}</span> <span class="hljs-punctuation">]</span>
</code></pre>
<p>...</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-json"><span class="hljs-punctuation">[</span> <span class="hljs-string">"EOSE"</span><span class="hljs-punctuation">,</span> <span class="hljs-string">"購読ID"</span> <span class="hljs-punctuation">]</span>
</code></pre>
<footer>ソースコードは <code>https://github.com/heguro/nostr-meeting-20230222</code> から</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5" data-paginate="true" data-footer="ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から" data-marpit-pagination="5" data-marpit-pagination-total="18" style="--paginate:true;--footer:ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から;">
<p>WebSocketのみで書いてみる</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript">pubkey = <span class="hljs-string">"93ab9382fa66c807cd4bb702cf3be9e52f42ff9629db84e5a97c7b3bd336a4ac"</span>; <span class="hljs-comment">// @heguroの公開鍵(hex)</span>
subscriptionId = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">random</span>().<span class="hljs-title function_">toString</span>().<span class="hljs-title function_">slice</span>(<span class="hljs-number">2</span>); <span class="hljs-comment">// 購読IDはランダム</span>
ws = <span class="hljs-keyword">new</span> <span class="hljs-title class_">WebSocket</span>(<span class="hljs-string">"wss://nostrja-kari.heguro.com"</span>); <span class="hljs-comment">// 接続して</span>
ws.<span class="hljs-title function_">addEventListener</span>(<span class="hljs-string">"open"</span>, <span class="hljs-function">() =></span> { <span class="hljs-comment">// 接続オープンできたら</span>
ws.<span class="hljs-title function_">send</span>(<span class="hljs-title class_">JSON</span>.<span class="hljs-title function_">stringify</span>( <span class="hljs-comment">// 取得条件を指定してリクエスト</span>
[ <span class="hljs-string">"REQ"</span>, subscriptionId, { <span class="hljs-attr">authors</span>: [pubkey], <span class="hljs-attr">kinds</span>: [<span class="hljs-number">1</span>], <span class="hljs-attr">limit</span>: <span class="hljs-number">10</span> } ]
));
});
ws.<span class="hljs-title function_">addEventListener</span>(<span class="hljs-string">"message"</span>, <span class="hljs-function">(<span class="hljs-params">event</span>) =></span> { <span class="hljs-comment">// メッセージが来たら</span>
<span class="hljs-keyword">const</span> message = <span class="hljs-title class_">JSON</span>.<span class="hljs-title function_">parse</span>(event.<span class="hljs-property">data</span>);
<span class="hljs-keyword">switch</span> (message[<span class="hljs-number">0</span>]) {
<span class="hljs-keyword">case</span> <span class="hljs-string">"EVENT"</span>: <span class="hljs-comment">// イベント</span>
<span class="hljs-keyword">if</span> (message[<span class="hljs-number">1</span>] === subscriptionId) {
<span class="hljs-keyword">const</span> event = message[<span class="hljs-number">2</span>];
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">Date</span>(event.<span class="hljs-property">created_at</span> * <span class="hljs-number">1000</span>), event.<span class="hljs-property">content</span>);
}
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> <span class="hljs-string">"EOSE"</span>: <span class="hljs-comment">// End of Stored Events. 投稿を全部返したよ</span>
<span class="hljs-keyword">if</span> (message[<span class="hljs-number">1</span>] === subscriptionId) ws.<span class="hljs-title function_">send</span>(<span class="hljs-title class_">JSON</span>.<span class="hljs-title function_">stringify</span>([<span class="hljs-string">"CLOSE"</span>, subscriptionId]));
ws.<span class="hljs-title function_">close</span>();
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> <span class="hljs-string">"NOTICE"</span>: <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">"error:"</span>, message[<span class="hljs-number">1</span>]); <span class="hljs-keyword">break</span>; <span class="hljs-comment">// エラーなど</span>
}
})
</code></pre>
<footer>ソースコードは <code>https://github.com/heguro/nostr-meeting-20230222</code> から</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6" data-paginate="true" data-footer="ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から" data-marpit-pagination="6" data-marpit-pagination-total="18" style="--paginate:true;--footer:ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から;">
<h2>Nostr 特有の概念: リレーとイベント</h2>
<ul>
<li>Nostrでの行動はすべて「イベント」で表現される
<ul>
<li>投稿、リアクション（ふぁぼ・いいね）、フォロー、プロフィール変更…</li>
</ul>
</li>
<li>リレーサーバーは、基本的には送られてきたイベントを（署名の検証をしつつ）<br />
保存し、クライアントに配信するだけ</li>
<li>クライアントは複数のリレーサーバーに対して、ユーザーの行動に応じたイベントを秘密鍵で署名し配信する</li>
</ul>
<footer>ソースコードは <code>https://github.com/heguro/nostr-meeting-20230222</code> から</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="7" data-paginate="true" data-footer="ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から" data-marpit-pagination="7" data-marpit-pagination-total="18" style="--paginate:true;--footer:ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から;">
<p>イベントの例</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-json"><span class="hljs-punctuation">{</span>
<span class="hljs-attr">"id"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"<64文字のhex>"</span><span class="hljs-punctuation">,</span> <span class="hljs-comment">// 作成時刻・投稿内容から生成される</span>
<span class="hljs-attr">"pubkey"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"93ab9382fa66c807cd4bb702cf3be9e52f42ff9629db84e5a97c7b3bd336a4ac"</span><span class="hljs-punctuation">,</span>
<span class="hljs-attr">"created_at"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">1676227868</span><span class="hljs-punctuation">,</span> <span class="hljs-comment">// イベント作成時刻（＝投稿時刻）</span>
<span class="hljs-attr">"kind"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">1</span><span class="hljs-punctuation">,</span> <span class="hljs-comment">// 投稿はkind(種類):1</span>
<span class="hljs-attr">"tags"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span><span class="hljs-punctuation">]</span><span class="hljs-punctuation">,</span> <span class="hljs-comment">// リプライ先などを指定</span>
<span class="hljs-attr">"content"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"本文\nだよ〜"</span><span class="hljs-punctuation">,</span> <span class="hljs-comment">// 改行は`\n`</span>
<span class="hljs-attr">"sig"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"<128文字のhex>"</span><span class="hljs-punctuation">,</span> <span class="hljs-comment">// 作成時刻・投稿内容・ID・秘密鍵から生成される</span>
<span class="hljs-punctuation">}</span>
</code></pre>
<p>（投稿イベントにはプロフィール情報が含まれてないので、別にREQしよう！）</p>
<footer>ソースコードは <code>https://github.com/heguro/nostr-meeting-20230222</code> から</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8" data-paginate="true" data-footer="ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から" data-marpit-pagination="8" data-marpit-pagination-total="18" style="--paginate:true;--footer:ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から;">
<h2>ここで問題</h2>
<p>既存の投稿だけでなく、リアルタイムに新しい投稿を取得したいときはどうする？</p>
<footer>ソースコードは <code>https://github.com/heguro/nostr-meeting-20230222</code> から</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="9" data-paginate="true" data-footer="ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から" data-marpit-pagination="9" data-marpit-pagination-total="18" style="--paginate:true;--footer:ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から;">
<p>再掲</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript">pubkey = <span class="hljs-string">"93ab9382fa66c807cd4bb702cf3be9e52f42ff9629db84e5a97c7b3bd336a4ac"</span>; <span class="hljs-comment">// @heguroの公開鍵(hex)</span>
subscriptionId = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">random</span>().<span class="hljs-title function_">toString</span>().<span class="hljs-title function_">slice</span>(<span class="hljs-number">2</span>); <span class="hljs-comment">// 購読IDはランダム</span>
ws = <span class="hljs-keyword">new</span> <span class="hljs-title class_">WebSocket</span>(<span class="hljs-string">"wss://nostrja-kari.heguro.com"</span>); <span class="hljs-comment">// 接続して</span>
ws.<span class="hljs-title function_">addEventListener</span>(<span class="hljs-string">"open"</span>, <span class="hljs-function">() =></span> { <span class="hljs-comment">// 接続オープンできたら</span>
ws.<span class="hljs-title function_">send</span>(<span class="hljs-title class_">JSON</span>.<span class="hljs-title function_">stringify</span>( <span class="hljs-comment">// 取得条件を指定してリクエスト</span>
[ <span class="hljs-string">"REQ"</span>, subscriptionId, { <span class="hljs-attr">authors</span>: [pubkey], <span class="hljs-attr">kinds</span>: [<span class="hljs-number">1</span>], <span class="hljs-attr">limit</span>: <span class="hljs-number">10</span> } ]
));
});
ws.<span class="hljs-title function_">addEventListener</span>(<span class="hljs-string">"message"</span>, <span class="hljs-function">(<span class="hljs-params">event</span>) =></span> { <span class="hljs-comment">// メッセージが来たら</span>
<span class="hljs-keyword">const</span> message = <span class="hljs-title class_">JSON</span>.<span class="hljs-title function_">parse</span>(event.<span class="hljs-property">data</span>);
<span class="hljs-keyword">switch</span> (message[<span class="hljs-number">0</span>]) {
<span class="hljs-keyword">case</span> <span class="hljs-string">"EVENT"</span>: <span class="hljs-comment">// イベント</span>
<span class="hljs-keyword">if</span> (message[<span class="hljs-number">1</span>] === subscriptionId) {
<span class="hljs-keyword">const</span> event = message[<span class="hljs-number">2</span>];
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">Date</span>(event.<span class="hljs-property">created_at</span> * <span class="hljs-number">1000</span>), event.<span class="hljs-property">content</span>);
}
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> <span class="hljs-string">"EOSE"</span>: <span class="hljs-comment">// End of Stored Events. 投稿を全部返したよ</span>
<span class="hljs-keyword">if</span> (message[<span class="hljs-number">1</span>] === subscriptionId) ws.<span class="hljs-title function_">send</span>(<span class="hljs-title class_">JSON</span>.<span class="hljs-title function_">stringify</span>([<span class="hljs-string">"CLOSE"</span>, subscriptionId]));
ws.<span class="hljs-title function_">close</span>();
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> <span class="hljs-string">"NOTICE"</span>: <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">"error:"</span>, message[<span class="hljs-number">1</span>]); <span class="hljs-keyword">break</span>; <span class="hljs-comment">// エラーなど</span>
}
})
</code></pre>
<footer>ソースコードは <code>https://github.com/heguro/nostr-meeting-20230222</code> から</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="10" data-paginate="true" data-footer="ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から" data-marpit-pagination="10" data-marpit-pagination-total="18" style="--paginate:true;--footer:ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から;">
<p>正解は・・・</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript">pubkey = <span class="hljs-string">"93ab9382fa66c807cd4bb702cf3be9e52f42ff9629db84e5a97c7b3bd336a4ac"</span>; <span class="hljs-comment">// @heguroの公開鍵(hex)</span>
subscriptionId = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">random</span>().<span class="hljs-title function_">toString</span>().<span class="hljs-title function_">slice</span>(<span class="hljs-number">2</span>); <span class="hljs-comment">// 購読IDはランダム</span>
ws = <span class="hljs-keyword">new</span> <span class="hljs-title class_">WebSocket</span>(<span class="hljs-string">"wss://nostrja-kari.heguro.com"</span>); <span class="hljs-comment">// 接続して</span>
ws.<span class="hljs-title function_">addEventListener</span>(<span class="hljs-string">"open"</span>, <span class="hljs-function">() =></span> { <span class="hljs-comment">// 接続オープンできたら</span>
ws.<span class="hljs-title function_">send</span>(<span class="hljs-title class_">JSON</span>.<span class="hljs-title function_">stringify</span>( <span class="hljs-comment">// 取得条件を指定してリクエスト</span>
[ <span class="hljs-string">"REQ"</span>, subscriptionId, { <span class="hljs-attr">authors</span>: [pubkey], <span class="hljs-attr">kinds</span>: [<span class="hljs-number">1</span>], <span class="hljs-attr">limit</span>: <span class="hljs-number">10</span> } ]
));
});
ws.<span class="hljs-title function_">addEventListener</span>(<span class="hljs-string">"message"</span>, <span class="hljs-function">(<span class="hljs-params">event</span>) =></span> { <span class="hljs-comment">// メッセージが来たら</span>
<span class="hljs-keyword">const</span> message = <span class="hljs-title class_">JSON</span>.<span class="hljs-title function_">parse</span>(event.<span class="hljs-property">data</span>);
<span class="hljs-keyword">switch</span> (message[<span class="hljs-number">0</span>]) {
<span class="hljs-keyword">case</span> <span class="hljs-string">"EVENT"</span>: <span class="hljs-comment">// イベント</span>
<span class="hljs-keyword">if</span> (message[<span class="hljs-number">1</span>] === subscriptionId) {
<span class="hljs-keyword">const</span> event = message[<span class="hljs-number">2</span>];
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">Date</span>(event.<span class="hljs-property">created_at</span> * <span class="hljs-number">1000</span>), event.<span class="hljs-property">content</span>);
}
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> <span class="hljs-string">"EOSE"</span>: <span class="hljs-comment">///// ↓ この2行をコメントアウト ↓ /////</span>
<span class="hljs-comment">// if (message[1] === subscriptionId) ws.send(JSON.stringify(["CLOSE", subscriptionId]));</span>
<span class="hljs-comment">// ws.close(); </span>
<span class="hljs-keyword">break</span>;
<span class="hljs-keyword">case</span> <span class="hljs-string">"NOTICE"</span>: <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">"error:"</span>, message[<span class="hljs-number">1</span>]); <span class="hljs-keyword">break</span>; <span class="hljs-comment">// エラーなど</span>
}
})
</code></pre>
<footer>ソースコードは <code>https://github.com/heguro/nostr-meeting-20230222</code> から</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="11" data-paginate="true" data-footer="ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から" data-marpit-pagination="11" data-marpit-pagination-total="18" style="--paginate:true;--footer:ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から;">
<h2>これで実行すると・・・</h2>
<footer>ソースコードは <code>https://github.com/heguro/nostr-meeting-20230222</code> から</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="12" data-paginate="true" data-footer="ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から" data-marpit-pagination="12" data-marpit-pagination-total="18" style="--paginate:true;--footer:ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から;">
<h2>実際は・・・</h2>
<ul>
<li>署名検証の作業が必要
<ul>
<li>投稿されてからリレーを経由して受信するまでにイベントを改ざんされていないか</li>
</ul>
</li>
<li>ライブラリーを使うのが手軽</li>
<li>JavaScriptなら<code>nostr-tools</code>
<ul>
<li><a href="https://github.com/nbd-wtf/nostr-tools">https://github.com/nbd-wtf/nostr-tools</a></li>
<li>取得時自動で署名検証してくれる（手動でもできる）</li>
</ul>
</li>
<li>DevToolsで読み込む例</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript">script = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">createElement</span>(<span class="hljs-string">"script"</span>);
script.<span class="hljs-property">src</span>=<span class="hljs-string">"https://unpkg.com/[email protected]/lib/nostr.bundle.js"</span>;
<span class="hljs-variable language_">document</span>.<span class="hljs-property">body</span>.<span class="hljs-title function_">append</span>(script);
</code></pre>
<footer>ソースコードは <code>https://github.com/heguro/nostr-meeting-20230222</code> から</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="13" data-paginate="true" data-footer="ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から" data-marpit-pagination="13" data-marpit-pagination-total="18" style="--paginate:true;--footer:ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から;">
<p><code>nostr-tools</code>ライブラリを使って同等の記述（修正済）</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript">pubkey = <span class="hljs-string">"93ab9382fa66c807cd4bb702cf3be9e52f42ff9629db84e5a97c7b3bd336a4ac"</span>;
relay = <span class="hljs-title class_">NostrTools</span>.<span class="hljs-title function_">relayInit</span>(<span class="hljs-string">"wss://nostrja-kari.heguro.com"</span>);
<span class="hljs-keyword">await</span> relay.<span class="hljs-title function_">connect</span>(); <span class="hljs-comment">// 接続 (本来はtry-catchで囲むべき)</span>
events = <span class="hljs-keyword">await</span> relay.<span class="hljs-title function_">list</span>([{ <span class="hljs-comment">// 取得条件を指定して取得開始</span>
<span class="hljs-attr">authors</span>: [pubkey], <span class="hljs-comment">// イベント発行者</span>
<span class="hljs-attr">kinds</span>: [<span class="hljs-number">1</span>], <span class="hljs-comment">// kind1は投稿(ノート)</span>
<span class="hljs-attr">limit</span>: <span class="hljs-number">10</span>, <span class="hljs-comment">// 過去10個分を取る</span>
}]);
<span class="hljs-keyword">for</span> (<span class="hljs-keyword">const</span> event <span class="hljs-keyword">of</span> events) { <span class="hljs-comment">// 取得したイベントを表示</span>
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(
<span class="hljs-keyword">new</span> <span class="hljs-title class_">Date</span>(event.<span class="hljs-property">created_at</span> * <span class="hljs-number">1000</span>), <span class="hljs-comment">// created_at: 投稿日時 Unix time (秒)</span>
event.<span class="hljs-property">content</span> <span class="hljs-comment">// content: 本文</span>
);
};
</code></pre>
<footer>ソースコードは <code>https://github.com/heguro/nostr-meeting-20230222</code> から</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="14" data-paginate="true" data-footer="ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から" data-marpit-pagination="14" data-marpit-pagination-total="18" style="--paginate:true;--footer:ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から;">
<p>投稿してみる（修正済）</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript">pubkey = <span class="hljs-string">"93ab9382fa66c807cd4bb702cf3be9e52f42ff9629db84e5a97c7b3bd336a4ac"</span>;
privkey = <span class="hljs-title class_">NostrTools</span>.<span class="hljs-property">nip19</span>.<span class="hljs-title function_">decode</span>(<span class="hljs-string">"nsec~~~"</span>).<span class="hljs-property">data</span>; <span class="hljs-comment">// 秘密鍵(hex形式)</span>
relay = <span class="hljs-title class_">NostrTools</span>.<span class="hljs-title function_">relayInit</span>(<span class="hljs-string">"wss://nostrja-kari.heguro.com"</span>);
<span class="hljs-keyword">await</span> relay.<span class="hljs-title function_">connect</span>(); <span class="hljs-comment">// 接続 (本来はtry-catchで囲むべき)</span>
event = {
<span class="hljs-string">"pubkey"</span>: pubkey,
<span class="hljs-string">"created_at"</span>: <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">floor</span>(<span class="hljs-title class_">Date</span>.<span class="hljs-title function_">now</span>() / <span class="hljs-number">1000</span>), <span class="hljs-comment">// 現在時刻(秒)</span>
<span class="hljs-string">"kind"</span>: <span class="hljs-number">1</span>, <span class="hljs-comment">// 投稿はkind(種類):1</span>
<span class="hljs-string">"tags"</span>: [], <span class="hljs-comment">// リプライ先があれば指定</span>
<span class="hljs-string">"content"</span>: <span class="hljs-string">"本文\nだよ〜"</span>, <span class="hljs-comment">// 改行は`\n`</span>
}
event.<span class="hljs-property">id</span> = <span class="hljs-title class_">NostrTools</span>.<span class="hljs-title function_">getEventHash</span>(event); <span class="hljs-comment">// IDを生成</span>
event.<span class="hljs-property">sig</span> = <span class="hljs-title class_">NostrTools</span>.<span class="hljs-title function_">signEvent</span>(event, privkey); <span class="hljs-comment">// sigを生成</span>
pub = relay.<span class="hljs-title function_">publish</span>(event);
pub.<span class="hljs-title function_">on</span>(<span class="hljs-string">'ok'</span>, <span class="hljs-function">() =></span> {
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">'投稿完了'</span>);
});
pub.<span class="hljs-title function_">on</span>(<span class="hljs-string">'failed'</span>, <span class="hljs-function">(<span class="hljs-params">error</span>) =></span> {
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">'投稿失敗:'</span>, error);
});
</code></pre>
<footer>ソースコードは <code>https://github.com/heguro/nostr-meeting-20230222</code> から</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="15" data-paginate="true" data-footer="ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から" data-marpit-pagination="15" data-marpit-pagination-total="18" style="--paginate:true;--footer:ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から;">
<h2>実際にクライアントがやってること</h2>
<ul>
<li>複数リレーに同時に接続する</li>
<li>リンク・画像埋め込みの表示
<ul>
<li>画像をやりとりする機能はNostrにはないので、外部アップローダーを使う</li>
</ul>
</li>
<li>リプライ・引用投稿などがあれば元投稿を見にいって表示を置き換える</li>
</ul>
<p>など・・・</p>
<p><em><strong>あなたもLet's Nostr!!!!!!!!!!!!!</strong></em></p>
<footer>ソースコードは <code>https://github.com/heguro/nostr-meeting-20230222</code> から</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="16" data-paginate="true" data-footer="ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から" data-marpit-pagination="16" data-marpit-pagination-total="18" style="--paginate:true;--footer:ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から;">
<h2>宣伝</h2>
<p>NostrFlu<br />
<a href="https://heguro.github.io/nostr-following-list-util/">https://heguro.github.io/nostr-following-list-util/</a></p>
<p>ソースコードの参考にもどうぞ（かなり雑ですが・・・）</p>
<footer>ソースコードは <code>https://github.com/heguro/nostr-meeting-20230222</code> から</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="17" data-paginate="true" data-footer="ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から" data-marpit-pagination="17" data-marpit-pagination-total="18" style="--paginate:true;--footer:ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から;">
<h2>補足</h2>
<ul>
<li>npub形式の公開鍵があれば、以下のコードでhex形式に変換できます</li>
</ul>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript">pubkey = <span class="hljs-title class_">NostrTools</span>.<span class="hljs-property">nip19</span>.<span class="hljs-title function_">decode</span>(
<span class="hljs-string">"npub1jw4e8qh6vmyq0n2tkupv7wlfu5h59luk98dcfedf03anh5ek5jkq936u57"</span>).<span class="hljs-property">data</span>;
</code></pre>
<ul>
<li>実際はNIP-07対応拡張機能（nos2xなど）を使って秘密鍵を直接扱うことなく署名することができ、この方法が<strong>強く推奨</strong>されます</li>
<li><code>nostr-tools</code>の仕様が素で書くには非常に分かりづらいので、パッケージの仕様や返り値などを確認しながらコーディングできるVS Codeなどのしっかりしたエディターで開発することをオススメします・・・</li>
<li>スライドで使用したリレーの <code>nostrja-kari.heguro.com</code> は現在投稿をホワイトリスト制にしています
<ul>
<li>別のリレーを使うか、リプいただければリストに入れます</li>
</ul>
</li>
</ul>
<footer>ソースコードは <code>https://github.com/heguro/nostr-meeting-20230222</code> から</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="18" data-paginate="true" data-footer="ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から" data-marpit-pagination="18" data-marpit-pagination-total="18" style="--paginate:true;--footer:ソースコードは `https://github.com/heguro/nostr-meeting-20230222` から;">
<p>補足2: NIP-07拡張機能（nos2xなど）を使って署名して投稿する<br />
（about:blankでは拡張機能が動かないので、example.comなどで実行）</p>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-javascript">pubkey = <span class="hljs-keyword">await</span> <span class="hljs-variable language_">window</span>.<span class="hljs-property">nostr</span>.<span class="hljs-title function_">getPublicKey</span>(); <span class="hljs-comment">// 拡張機能から公開鍵を取得</span>
relay = <span class="hljs-title class_">NostrTools</span>.<span class="hljs-title function_">relayInit</span>(<span class="hljs-string">"wss://nostrja-kari.heguro.com"</span>);
<span class="hljs-keyword">await</span> relay.<span class="hljs-title function_">connect</span>(); <span class="hljs-comment">// 接続 (本来はtry-catchで囲むべき)</span>
event = {
<span class="hljs-string">"pubkey"</span>: pubkey,
<span class="hljs-string">"created_at"</span>: <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">floor</span>(<span class="hljs-title class_">Date</span>.<span class="hljs-title function_">now</span>() / <span class="hljs-number">1000</span>), <span class="hljs-comment">// 現在時刻(秒)</span>
<span class="hljs-string">"kind"</span>: <span class="hljs-number">1</span>, <span class="hljs-comment">// 投稿はkind(種類):1</span>
<span class="hljs-string">"tags"</span>: [], <span class="hljs-comment">// リプライ先があれば指定</span>
<span class="hljs-string">"content"</span>: <span class="hljs-string">"本文\nだよ〜"</span>, <span class="hljs-comment">// 改行は`\n`</span>
}
event.<span class="hljs-property">id</span> = <span class="hljs-title class_">NostrTools</span>.<span class="hljs-title function_">getEventHash</span>(event); <span class="hljs-comment">// IDを生成</span>
event = <span class="hljs-keyword">await</span> <span class="hljs-variable language_">window</span>.<span class="hljs-property">nostr</span>.<span class="hljs-title function_">signEvent</span>(event); <span class="hljs-comment">// 拡張機能で署名して、sigを含めたイベントをもらう</span>
pub = relay.<span class="hljs-title function_">publish</span>(event);
pub.<span class="hljs-title function_">on</span>(<span class="hljs-string">'ok'</span>, <span class="hljs-function">() =></span> {
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">'投稿完了'</span>);
});
pub.<span class="hljs-title function_">on</span>(<span class="hljs-string">'failed'</span>, <span class="hljs-function">(<span class="hljs-params">error</span>) =></span> {
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">'投稿失敗:'</span>, error);
});
</code></pre>
<footer>ソースコードは <code>https://github.com/heguro/nostr-meeting-20230222</code> から</footer>
</section>
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