bsky-comments.js

/*
MIT License

Copyright (c) 2024 Nicholas Sideras

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

const rootElement = document.querySelector("#comments");

      var atProto = ToAtProtoUri(rootElement.dataset.uri);

      fetch(
        "https://public.api.bsky.app/xrpc/app.bsky.feed.getPostThread?uri=" + atProto
      )
        .then((response) => {
          if (!response.ok) {
            throw new Error(`HTTP error, status = ${response.status}`);
          }
          return response.json();
        })
        .then((data) => {
          if (
            typeof data.thread.replies != "undefined" &&
            data.thread.replies.length > 0
          ) {
            rootElement.appendChild(renderComments(data.thread));
          } else {
            const noReplies = document.createElement("em");
            noReplies.innerText = "No replies.";
            rootElement.appendChild(noReplies);
          }
        })
        .catch((error) => {
          const p = document.createElement("p");
          p.appendChild(document.createTextNode(`Error: ${error.message}`));
          document.body.appendChild(p, rootElement);
        });

        function ToBskyUrl(uri) {
            var splitUri = uri.split('/');
            if(splitUri[0] === 'at:')
            {
                return 'https://bsky.app/profile/' + splitUri[2] + '/post/' + splitUri[4];
            }
            else
            {
                return uri;
            }
        }

        function ToAtProtoUri(url)
        {
            var splitUri = url.split('/');
            if(splitUri[0] === 'https:' || splitUri[0] === 'http:')
            {
                return 'at://' + splitUri[4] + '/app.bsky.feed.post/' + splitUri[6];
            }
            else
            {
                return url;
            }
        }

        function ToBskyImgUrl(did, blobLink, thumb) {
          return `https://cdn.bsky.app/img/${thumb ? "feed_thumb" : "feed_fullsize"}/plain/${did}/${blobLink}`;
        }       

      function renderComments(thread)
      {
        const commentsNode = document.createElement("div");
        for (const comment of thread.replies) {
            var renderedString = renderComment(comment);
            var htmlContent = createElementFromHTML(renderedString);

            htmlContent.querySelector(".replies").appendChild(renderComments(comment));

            commentsNode.appendChild(htmlContent);
        }

        return commentsNode;
      }

      //https://stackoverflow.com/a/494348
      function createElementFromHTML(htmlString) {
        var div = document.createElement('div');
        div.innerHTML = htmlString.trim();
      
        // Change this to div.childNodes to support multiple top-level nodes.
        return div.firstChild;
      }

      // adjusted code from https://capscollective.com/blog/bluesky-blog-comments/
      function renderRichText(record) {
        let richText = ``
    
        const textEncoder = new TextEncoder();
        const utf8Decoder = new TextDecoder();
        const utf8Text = new Uint8Array(record.text.length * 3);
        textEncoder.encodeInto(record.text, utf8Text);
    
        var charIdx = 0;
        for (const facetIdx in record.facets) {
          const facet = record.facets[facetIdx];
          const facetFeature = facet.features[0];
          const facetType = facetFeature.$type;
    
          var facetLink = "#";
          if (facetType == "app.bsky.richtext.facet#tag") {
            facetLink = `https://bsky.app/hashtag/${facetFeature.tag}`;
          } else if (facetType == "app.bsky.richtext.facet#link") {
            facetLink = facetFeature.uri;
          } else if (facetType == "app.bsky.richtext.facet#mention") {
            facetLink = `https://bsky.app/profile/${facetFeature.did}`;
          }
    
          if (charIdx < facet.index.byteStart) {
            const preFacetText = utf8Text.slice(charIdx, facet.index.byteStart);
            richText += utf8Decoder.decode(preFacetText)
          }
    
          const facetText = utf8Text.slice(facet.index.byteStart, facet.index.byteEnd);
          richText += `<a href="${facetLink}" target="_blank">` + utf8Decoder.decode(facetText) + '</a>';
    
          charIdx = facet.index.byteEnd;
        }
    
        if (charIdx < utf8Text.length) {
          const postFacetText = utf8Text.slice(charIdx, utf8Text.length);
          richText += utf8Decoder.decode(postFacetText);
        }
    
        return richText;
      }

      function renderAttachment(post) {
        let attachment = "";
        if (post.embed) {
          const embedType = post.embed.$type;
      
          if (embedType === "app.bsky.embed.external#view") {
            const {uri, title, description} = post.embed.external;
            if (uri.includes(".gif?")) {
              attachment = `<img src="${uri}" title="${title}" alt="${description}">`;
            }
          } else if (embedType === "app.bsky.embed.images#view") {
            const images = post.record.embed.images;
            attachment = images.map(image => {
              const thumb = ToBskyImgUrl(post.author.did, image.image.ref.$link, true);
              const orig = ToBskyImgUrl(post.author.did, image.image.ref.$link, false);
              return `<a href="${orig}" target="_blank"><img src="${thumb}" alt="${image.alt}"></a>`;
            }).join('');
          }
        }
        return attachment;
      }
    
      function renderComment(comment) {
       var replyDate = new Date(comment.post.record.createdAt);
       return `<ul class="comment" style="display: flex; list-style: none;">
      <li style="margin-right: 10px;">
        <img src="${comment.post.author.avatar}" width="42px" height="42px" style="clip-path: circle()" />
      </li>
      <li>
        <div><a href="https://bsky.app/profile/${comment.post.author.handle}" rel="ugc" style="color: #000; text-decoration: none;">
          <strong class="display-name" style="white-space: nowrap;">${comment.post.author.displayName}</strong>
          <span class="handle" style="white-space: nowrap;">@${comment.post.author.handle}</span>
          <span style="white-space: nowrap;">${replyDate.toLocaleString()}</span>
        </a></div>
        <a href="${ToBskyUrl(comment.post.uri)}" rel="ugc" style="color: #000; text-decoration: none;">
        <div>${renderRichText(comment.post.record)}</div>
        <div>${renderAttachment(comment.post)}</div>
        <div>
          <!-- icons from https://www.systemuicons.com/ -->
            <span style="margin-right: 1em;">
            <svg style="position: relative; top: .3em;" xmlns="http://www.w3.org/2000/svg" width="21" height="21" viewBox="0 0 21 21">
                <path fill="none" stroke="#000000" stroke-linecap="round" stroke-linejoin="round" d="M11 16.517c4.418 0 8-3.284 8-7.017S15.418 3 11 3S3 6.026 3 9.759c0 1.457.546 2.807 1.475 3.91L3.5 18.25l3.916-2.447a9.2 9.2 0 0 0 3.584.714" />
            </svg>
            ${comment.post.replyCount}</span>


            <span style="margin-right: 1em;">
            <svg style="position: relative; top: .3em;" xmlns="http://www.w3.org/2000/svg" width="21" height="21" viewBox="0 0 21 21">
                <g fill="none" fill-rule="evenodd" stroke="#000000" stroke-linecap="round" stroke-linejoin="round">
                    <path d="m13.5 13.5l3 3l3-3" />
                    <path d="M9.5 4.5h3a4 4 0 0 1 4 4v8m-9-9l-3-3l-3 3" />
                    <path d="M11.5 16.5h-3a4 4 0 0 1-4-4v-8" />
                </g>
            </svg>
            ${comment.post.repostCount}
        </span>

        <span style="margin-right: 1em;">
            <svg style="position: relative; top: .3em;" xmlns="http://www.w3.org/2000/svg" width="21" height="21" viewBox="0 0 21 21">
                <path fill="none" stroke="#000000" stroke-linecap="round" stroke-linejoin="round" d="M10.5 6.5c.5-2.5 4.343-2.657 6-1c1.603 1.603 1.5 4.334 0 6l-6 6l-6-6a4.243 4.243 0 0 1 0-6c1.55-1.55 5.5-1.5 6 1" />
            </svg>
            ${comment.post.likeCount}
        </span>
            
        </div></a>
        <div class="replies" style="margin-top: 1em;">
        </div>
      </li>
    </ul>`;
    }