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build smart knowledge-sharing systems that combine the best of human expertise with smart technology
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24 kB · 886 lines
TypeScript
at main
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// ============================================================================// Types// ============================================================================
interface AtUriParts { did: string; collection: string; rkey: string;}
interface DIDService { id: string; type: string; serviceEndpoint: string;}
interface DIDDocument { service?: DIDService[];}
interface BskyPostRef { uri: string; cid: string;}
interface DocumentRecord { $type: string; title: string; site: string; path: string; textContent: string; publishedAt: string; canonicalUrl?: string; description?: string; tags?: string[]; bskyPostRef?: BskyPostRef;}
interface RichTextFacetIndex { byteStart: number; byteEnd: number;}
type RichTextFeature = | { $type: "app.bsky.richtext.facet#link"; uri: string } | { $type: "app.bsky.richtext.facet#mention"; did: string } | { $type: "app.bsky.richtext.facet#tag"; tag: string } | { $type: string };
interface RichTextFacet { index: RichTextFacetIndex; features: RichTextFeature[];}
interface PostRecord { text: string; createdAt: string; facets?: RichTextFacet[];}
interface ProfileViewBasic { did: string; handle: string; displayName?: string; avatar?: string;}
interface PostView { uri: string; cid: string; author: ProfileViewBasic; record: PostRecord; indexedAt: string;}
interface ThreadViewPost { $type: "app.bsky.feed.defs#threadViewPost"; post: PostView; replies?: ThreadOrBlocked[];}
interface BlockedPost { $type: "app.bsky.feed.defs#blockedPost" | "app.bsky.feed.defs#notFoundPost";}
type ThreadOrBlocked = ThreadViewPost | BlockedPost;
interface FlatComment { post: PostView; hasMoreReplies: boolean;}
// Discriminated union for component statetype CommentsState = | { type: "loading" } | { type: "no-document" } | { type: "no-comments-enabled" } | { type: "empty"; postUrl: string } | { type: "error"; message: string } | { type: "loaded"; thread: ThreadViewPost; postUrl: string };
// ============================================================================// Styles// ============================================================================
const styles = `:host { display: block; font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; color: var(--sequoia-fg-color, #1f2937); line-height: 1.5;}
* { box-sizing: border-box;}
.sequoia-comments-container { max-width: 100%;}
.sequoia-loading,.sequoia-error,.sequoia-empty,.sequoia-warning { padding: 1rem; border-radius: var(--sequoia-border-radius, 8px); text-align: center;}
.sequoia-loading { background: var(--sequoia-bg-color, #ffffff); border: 1px solid var(--sequoia-border-color, #e5e7eb); color: var(--sequoia-secondary-color, #6b7280);}
.sequoia-loading-spinner { display: inline-block; width: 1.25rem; height: 1.25rem; border: 2px solid var(--sequoia-border-color, #e5e7eb); border-top-color: var(--sequoia-accent-color, #2563eb); border-radius: 50%; animation: sequoia-spin 0.8s linear infinite; margin-right: 0.5rem; vertical-align: middle;}
@keyframes sequoia-spin { to { transform: rotate(360deg); }}
.sequoia-error { background: #fef2f2; border: 1px solid #fecaca; color: #dc2626;}
.sequoia-warning { background: #fffbeb; border: 1px solid #fde68a; color: #d97706;}
.sequoia-empty { background: var(--sequoia-bg-color, #ffffff); border: 1px solid var(--sequoia-border-color, #e5e7eb); color: var(--sequoia-secondary-color, #6b7280);}
.sequoia-comments-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; padding-bottom: 0.75rem;}
.sequoia-comments-title { font-size: 1.125rem; font-weight: 600; margin: 0;}
.sequoia-reply-button { display: inline-flex; align-items: center; gap: 0.375rem; padding: 0.5rem 1rem; background: var(--sequoia-accent-color, #2563eb); color: #ffffff; border: none; border-radius: var(--sequoia-border-radius, 8px); font-size: 0.875rem; font-weight: 500; cursor: pointer; text-decoration: none; transition: background-color 0.15s ease;}
.sequoia-reply-button:hover { background: color-mix(in srgb, var(--sequoia-accent-color, #2563eb) 85%, black);}
.sequoia-reply-button svg { width: 1rem; height: 1rem;}
.sequoia-comments-list { display: flex; flex-direction: column;}
.sequoia-thread { border-top: 1px solid var(--sequoia-border-color, #e5e7eb); padding-bottom: 1rem;}
.sequoia-thread + .sequoia-thread { margin-top: 0.5rem;}
.sequoia-thread:last-child { border-bottom: 1px solid var(--sequoia-border-color, #e5e7eb);}
.sequoia-comment { display: flex; gap: 0.75rem; padding-top: 1rem;}
.sequoia-comment-avatar-column { display: flex; flex-direction: column; align-items: center; flex-shrink: 0; width: 2.5rem; position: relative;}
.sequoia-comment-avatar { width: 2.5rem; height: 2.5rem; border-radius: 50%; background: var(--sequoia-border-color, #e5e7eb); object-fit: cover; flex-shrink: 0; position: relative; z-index: 1;}
.sequoia-comment-avatar-placeholder { width: 2.5rem; height: 2.5rem; border-radius: 50%; background: var(--sequoia-border-color, #e5e7eb); display: flex; align-items: center; justify-content: center; flex-shrink: 0; color: var(--sequoia-secondary-color, #6b7280); font-weight: 600; font-size: 1rem; position: relative; z-index: 1;}
.sequoia-thread-line { position: absolute; top: 2.5rem; bottom: calc(-1rem - 0.5rem); left: 50%; transform: translateX(-50%); width: 2px; background: var(--sequoia-border-color, #e5e7eb);}
.sequoia-comment-content { flex: 1; min-width: 0;}
.sequoia-comment-header { display: flex; align-items: baseline; gap: 0.5rem; margin-bottom: 0.25rem; flex-wrap: wrap;}
.sequoia-comment-author { font-weight: 600; color: var(--sequoia-fg-color, #1f2937); text-decoration: none; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;}
.sequoia-comment-author:hover { color: var(--sequoia-accent-color, #2563eb);}
.sequoia-comment-handle { font-size: 0.875rem; color: var(--sequoia-secondary-color, #6b7280); overflow: hidden; text-overflow: ellipsis; white-space: nowrap;}
.sequoia-comment-time { font-size: 0.875rem; color: var(--sequoia-secondary-color, #6b7280); flex-shrink: 0;}
.sequoia-comment-time::before { content: "·"; margin-right: 0.5rem;}
.sequoia-comment-text { margin: 0; white-space: pre-wrap; word-wrap: break-word;}
.sequoia-comment-text a { color: var(--sequoia-accent-color, #2563eb); text-decoration: none;}
.sequoia-comment-text a:hover { text-decoration: underline;}
.sequoia-bsky-logo { width: 1rem; height: 1rem;}`;
// ============================================================================// Utility Functions// ============================================================================
function formatRelativeTime(dateString: string): string { const date = new Date(dateString); const now = new Date(); const diffMs = now.getTime() - date.getTime(); const diffSeconds = Math.floor(diffMs / 1000); const diffMinutes = Math.floor(diffSeconds / 60); const diffHours = Math.floor(diffMinutes / 60); const diffDays = Math.floor(diffHours / 24); const diffWeeks = Math.floor(diffDays / 7); const diffMonths = Math.floor(diffDays / 30); const diffYears = Math.floor(diffDays / 365);
if (diffSeconds < 60) { return "just now"; } if (diffMinutes < 60) { return `${diffMinutes}m ago`; } if (diffHours < 24) { return `${diffHours}h ago`; } if (diffDays < 7) { return `${diffDays}d ago`; } if (diffWeeks < 4) { return `${diffWeeks}w ago`; } if (diffMonths < 12) { return `${diffMonths}mo ago`; } return `${diffYears}y ago`;}
function escapeHtml(text: string): string { const div = document.createElement("div"); div.textContent = text; return div.innerHTML;}
function renderTextWithFacets(text: string, facets?: RichTextFacet[]): string { if (!facets || facets.length === 0) { return escapeHtml(text); }
const encoder = new TextEncoder(); const decoder = new TextDecoder(); const textBytes = encoder.encode(text);
const sortedFacets = [...facets].sort( (a, b) => a.index.byteStart - b.index.byteStart );
let result = ""; let lastEnd = 0;
for (const facet of sortedFacets) { const { byteStart, byteEnd } = facet.index;
if (byteStart > lastEnd) { const beforeBytes = textBytes.slice(lastEnd, byteStart); result += escapeHtml(decoder.decode(beforeBytes)); }
const facetBytes = textBytes.slice(byteStart, byteEnd); const facetText = decoder.decode(facetBytes);
const feature = facet.features[0]; if (feature) { if (feature.$type === "app.bsky.richtext.facet#link") { const linkFeature = feature as { $type: string; uri: string }; result += `<a href="${escapeHtml(linkFeature.uri)}" target="_blank" rel="noopener noreferrer">${escapeHtml(facetText)}</a>`; } else if (feature.$type === "app.bsky.richtext.facet#mention") { const mentionFeature = feature as { $type: string; did: string }; result += `<a href="https://bsky.app/profile/${escapeHtml(mentionFeature.did)}" target="_blank" rel="noopener noreferrer">${escapeHtml(facetText)}</a>`; } else if (feature.$type === "app.bsky.richtext.facet#tag") { const tagFeature = feature as { $type: string; tag: string }; result += `<a href="https://bsky.app/hashtag/${escapeHtml(tagFeature.tag)}" target="_blank" rel="noopener noreferrer">${escapeHtml(facetText)}</a>`; } else { result += escapeHtml(facetText); } } else { result += escapeHtml(facetText); }
lastEnd = byteEnd; }
if (lastEnd < textBytes.length) { const remainingBytes = textBytes.slice(lastEnd); result += escapeHtml(decoder.decode(remainingBytes)); }
return result;}
function getInitials(name: string): string { const parts = name.trim().split(/\s+/); if (parts.length >= 2) { return (parts[0][0] + parts[1][0]).toUpperCase(); } return name.substring(0, 2).toUpperCase();}
// ============================================================================// AT Protocol Client Functions// ============================================================================
function parseAtUri(atUri: string): AtUriParts | null { const match = atUri.match(/^at:\/\/([^/]+)\/([^/]+)\/(.+)$/); if (!match) return null; return { did: match[1], collection: match[2], rkey: match[3], };}
async function resolvePDS(did: string): Promise<string> { let pdsUrl: string | undefined;
if (did.startsWith("did:plc:")) { const didDocUrl = `https://plc.directory/${did}`; const didDocResponse = await fetch(didDocUrl); if (!didDocResponse.ok) { throw new Error(`Could not fetch DID document: ${didDocResponse.status}`); } const didDoc: DIDDocument = await didDocResponse.json();
const pdsService = didDoc.service?.find( (s) => s.id === "#atproto_pds" || s.type === "AtprotoPersonalDataServer" ); pdsUrl = pdsService?.serviceEndpoint; } else if (did.startsWith("did:web:")) { const domain = did.replace("did:web:", ""); const didDocUrl = `https://${domain}/.well-known/did.json`; const didDocResponse = await fetch(didDocUrl); if (!didDocResponse.ok) { throw new Error(`Could not fetch DID document: ${didDocResponse.status}`); } const didDoc: DIDDocument = await didDocResponse.json();
const pdsService = didDoc.service?.find( (s) => s.id === "#atproto_pds" || s.type === "AtprotoPersonalDataServer" ); pdsUrl = pdsService?.serviceEndpoint; } else { throw new Error(`Unsupported DID method: ${did}`); }
if (!pdsUrl) { throw new Error("Could not find PDS URL for user"); }
return pdsUrl;}
async function getRecord( did: string, collection: string, rkey: string): Promise<DocumentRecord> { const pdsUrl = await resolvePDS(did);
const url = new URL(`${pdsUrl}/xrpc/com.atproto.repo.getRecord`); url.searchParams.set("repo", did); url.searchParams.set("collection", collection); url.searchParams.set("rkey", rkey);
const response = await fetch(url.toString()); if (!response.ok) { throw new Error(`Failed to fetch record: ${response.status}`); }
const data = await response.json(); return data.value as DocumentRecord;}
async function getDocument(atUri: string): Promise<DocumentRecord> { const parsed = parseAtUri(atUri); if (!parsed) { throw new Error(`Invalid AT URI: ${atUri}`); }
return getRecord(parsed.did, parsed.collection, parsed.rkey);}
async function getPostThread( postUri: string, depth: number = 6): Promise<ThreadViewPost> { const url = new URL( "https://public.api.bsky.app/xrpc/app.bsky.feed.getPostThread" ); url.searchParams.set("uri", postUri); url.searchParams.set("depth", depth.toString());
const response = await fetch(url.toString()); if (!response.ok) { throw new Error(`Failed to fetch post thread: ${response.status}`); }
const data = await response.json();
if (data.thread.$type !== "app.bsky.feed.defs#threadViewPost") { throw new Error("Post not found or blocked"); }
return data.thread as ThreadViewPost;}
function buildBskyAppUrl(postUri: string): string { const parsed = parseAtUri(postUri); if (!parsed) { throw new Error(`Invalid post URI: ${postUri}`); }
return `https://bsky.app/profile/${parsed.did}/post/${parsed.rkey}`;}
function isThreadViewPost(post: ThreadOrBlocked): post is ThreadViewPost { return post?.$type === "app.bsky.feed.defs#threadViewPost";}
// ============================================================================// Bluesky Icon// ============================================================================
const BLUESKY_ICON = `<svg class="sequoia-bsky-logo" viewBox="0 0 600 530" fill="currentColor" xmlns="http://www.w3.org/2000/svg"> <path d="m135.72 44.03c66.496 49.921 138.02 151.14 164.28 205.46 26.262-54.316 97.782-155.54 164.28-205.46 47.98-36.021 125.72-63.892 125.72 24.795 0 17.712-10.155 148.79-16.111 170.07-20.703 73.984-96.144 92.854-163.25 81.433 117.3 19.964 147.14 86.092 82.697 152.22-122.39 125.59-175.91-31.511-189.63-71.766-2.514-7.3797-3.6904-10.832-3.7077-7.8964-0.0174-2.9357-1.1937 0.51669-3.7077 7.8964-13.714 40.255-67.233 197.36-189.63 71.766-64.444-66.128-34.605-132.26 82.697-152.22-67.108 11.421-142.55-7.4491-163.25-81.433-5.9562-21.282-16.111-152.36-16.111-170.07 0-88.687 77.742-60.816 125.72-24.795z"/></svg>`;
// ============================================================================// Web Component// ============================================================================
// SSR-safe base class - use HTMLElement in browser, empty class in Node.jsconst BaseElement = typeof HTMLElement !== "undefined" ? HTMLElement : (class {} as typeof HTMLElement);
class SequoiaComments extends BaseElement { commentsContainer!: HTMLDivElement; state!: CommentsState; abortController: AbortController | null;
constructor() { super(); const shadow = this.attachShadow({ mode: "open" });
const styleTag = document.createElement("style"); shadow.appendChild(styleTag); styleTag.innerText = styles;
const container = document.createElement("div"); shadow.appendChild(container); container.className = "sequoia-comments-container"; container.part = "container";
this.commentsContainer = container; this.state = { type: "loading" }; this.abortController = null; }
static get observedAttributes(): string[] { return ["document-uri", "depth", "hide"]; }
connectedCallback(): void { this.render(); this.loadComments(); }
disconnectedCallback(): void { this.abortController?.abort(); }
attributeChangedCallback(): void { if (this.isConnected) { this.loadComments(); } }
get documentUri(): string | null { const attrUri = this.getAttribute("document-uri"); if (attrUri) { return attrUri; }
const linkTag = document.querySelector( 'link[rel="site.standard.document"]' ); return linkTag?.getAttribute("href") ?? null; }
get depth(): number { const depthAttr = this.getAttribute("depth"); return depthAttr ? parseInt(depthAttr, 10) : 6; }
get hide(): boolean { const hideAttr = this.getAttribute("hide"); return hideAttr === "auto"; }
async loadComments(): Promise<void> { this.abortController?.abort(); this.abortController = new AbortController();
this.state = { type: "loading" }; this.render();
const docUri = this.documentUri; if (!docUri) { this.state = { type: "no-document" }; this.render(); return; }
try { const doc = await getDocument(docUri);
if (!doc.bskyPostRef) { this.state = { type: "no-comments-enabled" }; this.render(); return; }
const postUrl = buildBskyAppUrl(doc.bskyPostRef.uri);
const thread = await getPostThread(doc.bskyPostRef.uri, this.depth);
const replies = thread.replies?.filter(isThreadViewPost) ?? []; if (replies.length === 0) { this.state = { type: "empty", postUrl }; this.render(); return; }
this.state = { type: "loaded", thread, postUrl }; this.render(); } catch (error) { const message = error instanceof Error ? error.message : "Failed to load comments"; this.state = { type: "error", message }; this.render(); } }
render(): void { switch (this.state.type) { case "loading": this.commentsContainer.innerHTML = ` <div class="sequoia-loading"> <span class="sequoia-loading-spinner"></span> Loading comments... </div> `; break;
case "no-document": this.commentsContainer.innerHTML = ` <div class="sequoia-warning"> No document found. Add a <code><link rel="site.standard.document" href="at://..."></code> tag to your page. </div> `; if (this.hide) { this.commentsContainer.style.display = "none"; } break;
case "no-comments-enabled": this.commentsContainer.innerHTML = ` <div class="sequoia-empty"> Comments are not enabled for this post. </div> `; break;
case "empty": this.commentsContainer.innerHTML = ` <div class="sequoia-comments-header"> <h3 class="sequoia-comments-title">Comments</h3> <a href="${this.state.postUrl}" target="_blank" rel="noopener noreferrer" class="sequoia-reply-button"> ${BLUESKY_ICON} Reply on Bluesky </a> </div> <div class="sequoia-empty"> No comments yet. Be the first to reply on Bluesky! </div> `; break;
case "error": this.commentsContainer.innerHTML = ` <div class="sequoia-error"> Failed to load comments: ${escapeHtml(this.state.message)} </div> `; break;
case "loaded": { const replies = this.state.thread.replies?.filter(isThreadViewPost) ?? []; const threadsHtml = replies .map((reply) => this.renderThread(reply)) .join(""); const commentCount = this.countComments(replies);
this.commentsContainer.innerHTML = ` <div class="sequoia-comments-header"> <h3 class="sequoia-comments-title">${commentCount} Comment${commentCount !== 1 ? "s" : ""}</h3> <a href="${this.state.postUrl}" target="_blank" rel="noopener noreferrer" class="sequoia-reply-button"> ${BLUESKY_ICON} Reply on Bluesky </a> </div> <div class="sequoia-comments-list"> ${threadsHtml} </div> `; break; } } }
flattenThread(thread: ThreadViewPost): FlatComment[] { const result: FlatComment[] = []; const nestedReplies = thread.replies?.filter(isThreadViewPost) ?? [];
result.push({ post: thread.post, hasMoreReplies: nestedReplies.length > 0, });
for (const reply of nestedReplies) { result.push(...this.flattenThread(reply)); }
return result; }
renderThread(thread: ThreadViewPost): string { const flatComments = this.flattenThread(thread); const commentsHtml = flatComments .map((item, index) => this.renderComment(item.post, item.hasMoreReplies, index) ) .join("");
return `<div class="sequoia-thread">${commentsHtml}</div>`; }
renderComment( post: PostView, showThreadLine: boolean = false, _index: number = 0 ): string { const author = post.author; const displayName = author.displayName || author.handle; const avatarHtml = author.avatar ? `<img class="sequoia-comment-avatar" src="${escapeHtml(author.avatar)}" alt="${escapeHtml(displayName)}" loading="lazy" />` : `<div class="sequoia-comment-avatar-placeholder">${getInitials(displayName)}</div>`;
const profileUrl = `https://bsky.app/profile/${author.did}`; const textHtml = renderTextWithFacets(post.record.text, post.record.facets); const timeAgo = formatRelativeTime(post.record.createdAt); const threadLineHtml = showThreadLine ? '<div class="sequoia-thread-line"></div>' : "";
return ` <div class="sequoia-comment"> <div class="sequoia-comment-avatar-column"> ${avatarHtml} ${threadLineHtml} </div> <div class="sequoia-comment-content"> <div class="sequoia-comment-header"> <a href="${profileUrl}" target="_blank" rel="noopener noreferrer" class="sequoia-comment-author"> ${escapeHtml(displayName)} </a> <span class="sequoia-comment-handle">@${escapeHtml(author.handle)}</span> <span class="sequoia-comment-time">${timeAgo}</span> </div> <p class="sequoia-comment-text">${textHtml}</p> </div> </div> `; }
countComments(replies: ThreadViewPost[]): number { let count = 0; for (const reply of replies) { count += 1; const nested = reply.replies?.filter(isThreadViewPost) ?? []; count += this.countComments(nested); } return count; }}
// Register the custom elementif (typeof customElements !== "undefined") { customElements.define("sequoia-comments", SequoiaComments);}
// Export for module usageexport { SequoiaComments };