@hashgraphonline/conversational-agent/dist/esm/index41.js

Hashgraph Online conversational AI agent implementing HCS-10 communication, HCS-2 registries, and content inscription on Hedera. https://hol.org

import { BasePlugin, BaseHederaQueryTool } from "hedera-agent-kit";
import { z } from "zod";
const PageSnapshotSchema = z.object({
  url: z.string().url(),
  maxCharacters: z.number().int().min(256, "Minimum length is 256 characters").max(8e3, "Maximum length is 8000 characters").optional().default(3e3)
});
class WebPageSnapshotTool extends BaseHederaQueryTool {
  constructor(params) {
    const { fetchImpl, ...rest } = params;
    super(rest);
    this.name = "web_page_snapshot";
    this.description = "Fetches the visible text content of a web page for analysis.";
    this.namespace = "browser";
    this.specificInputSchema = PageSnapshotSchema;
    this.fetchImpl = fetchImpl ?? fetch;
  }
  async executeQuery(input) {
    const maxChars = input.maxCharacters ?? 3e3;
    try {
      const response = await this.fetchImpl(input.url, {
        redirect: "follow"
      });
      if (!response.ok) {
        return `Failed to load ${input.url}: HTTP ${response.status}`;
      }
      const html = await response.text();
      const text = this.normalizeHtml(html);
      if (!text) {
        return "The fetched page did not contain readable text.";
      }
      return text.length > maxChars ? `${text.slice(0, maxChars)}…` : text;
    } catch (error) {
      this.logger.error("WebPageSnapshotTool failed", error);
      return `Failed to fetch content for ${input.url}: ${error instanceof Error ? error.message : String(error)}`;
    }
  }
  normalizeHtml(html) {
    const withoutScripts = html.replace(/<script[\s\S]*?<\/script>/gi, " ").replace(/<style[\s\S]*?<\/style>/gi, " ").replace(/<!--([\s\S]*?)-->/g, " ");
    const stripped = withoutScripts.replace(/<[^>]+>/g, " ");
    const decoded = stripped.replace(/&nbsp;/gi, " ").replace(/&amp;/gi, "&").replace(/&lt;/gi, "<").replace(/&gt;/gi, ">").replace(/&quot;/gi, '"').replace(/&#39;/gi, "'");
    return decoded.replace(/\s+/g, " ").trim();
  }
}
class WebBrowserPlugin extends BasePlugin {
  constructor() {
    super(...arguments);
    this.id = "web-browser";
    this.name = "Web Browser Plugin";
    this.description = "Provides tools for fetching live web page content to enrich assistant understanding.";
    this.version = "0.1.0";
    this.author = "Hashgraph Online";
    this.namespace = "browser";
    this.tools = [];
  }
  async initialize(context) {
    await super.initialize(context);
    const hederaKit = context.config.hederaKit;
    if (!hederaKit) {
      this.context.logger.warn(
        "WebBrowserPlugin skipped because HederaAgentKit was not present in plugin context."
      );
      this.tools = [];
      return;
    }
    const tool = new WebPageSnapshotTool({
      hederaKit,
      logger: this.context.logger
    });
    this.tools = [tool];
    this.context.logger.info("Web Browser Plugin initialized with snapshot tool");
  }
  getTools() {
    return this.tools;
  }
  async cleanup() {
    this.tools = [];
  }
}
export {
  WebBrowserPlugin
};
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