substr/models/article.ts

import { render as renderMarkdown } from "@deno/gfm";
import { nip19 } from "@nostr/tools";
import { NostrEvent as NEvent } from "@nostrify/nostrify";
import { replaceNostrUris } from "../nostr/links.ts";
import config from "../config.ts";

export default class Article {
  event: NEvent;

  constructor(event: NEvent) {
    this.event = event;
  }

  get identifier(): string {
    const tag = this.event.tags.find((t) => t[0] === "d");
    return tag ? tag[1] : "";
  }

  get isDraft(): boolean {
    return this.event.kind === 30024;
  }

  get url(): string {
    return `${config.base_url}/${this.naddr}`;
  }

  get title(): string {
    const tag = this.event.tags.find((t) => t[0] === "title");
    return tag ? tag[1] : "Untitled";
  }

  get image(): string | undefined {
    const tag = this.event.tags.find((t) => t[0] === "image");
    return tag ? tag[1] : undefined;
  }

  get summary(): string {
    const tag = this.event.tags.find((t) => t[0] === "summary");
    return tag ? tag[1] : "";
  }

  get publishedAt(): number {
    const tag = this.event.tags.find((t) => t[0] === "published_at");
    return tag ? parseInt(tag[1]) : this.event.created_at;
  }

  get updatedAt(): number {
    return this.event.created_at;
  }

  get content(): string {
    return this.event.content;
  }

  get isDeleted(): boolean {
    return !!this.event.tags.find((t) => t[0] === "deleted");
  }

  get naddr(): string {
    return nip19.naddrEncode({
      identifier: this.identifier,
      pubkey: this.event.pubkey,
      kind: this.event.kind,
      relays: [config.relay_urls[0]],
    });
  }

  async buildContentHtml(): Promise<string> {
    let md = this.event.content.trim();
    md = md.replace(`# ${this.title}\n`, "");
    md = await replaceNostrUris(md);
    return renderMarkdown(md);
  }
}