Adding some webmentions code

assets/js/webmentions.js

@@ -0,0 +1,121 @@
+/**
+ * Webmention utilities for ritual.sh
+ * Fetches and formats webmentions from the API
+ */
+
+class WebmentionUtils {
+  constructor() {
+    this.apiUrl = "https://api.ritual.sh";
+  }
+
+  /**
+   * Fetch webmentions for a given target URL
+   * @param {string} targetUrl - The page URL to get webmentions for
+   * @param {number} limit - Maximum number of webmentions to fetch (default: 100)
+   * @returns {Promise<Array>} Array of webmention objects
+   */
+  async fetch(targetUrl, limit = 100) {
+    try {
+      const params = new URLSearchParams({
+        target: targetUrl,
+        limit: limit.toString(),
+      });
+
+      const response = await fetch(`${this.apiUrl}/webmentions?${params}`);
+
+      if (!response.ok) {
+        console.error(`Webmention API error: ${response.status}`);
+        return [];
+      }
+
+      const data = await response.json();
+      return data.mentions || [];
+    } catch (error) {
+      console.error("Error fetching webmentions:", error);
+      return [];
+    }
+  }
+
+  /**
+   * Format webmentions as a comma-separated list of links
+   * @param {Array} mentions - Array of webmention objects
+   * @returns {string} HTML string of comma-separated links
+   */
+  asCommaSeparatedList(mentions) {
+    if (!mentions || mentions.length === 0) {
+      return "";
+    }
+
+    return mentions
+      .map((mention) => {
+        const url = mention.author_url || mention.source;
+        const domain = this.formatDomain(url);
+        const escapedUrl = this.escapeHtml(url);
+        const escapedDomain = this.escapeHtml(domain);
+        return `<a href="${escapedUrl}" target="_blank">${escapedDomain}</a>`;
+      })
+      .join(", ");
+  }
+
+  /**
+   * Format a URL to display just the domain (no protocol, www, or path)
+   * @param {string} url - The URL to format
+   * @returns {string} Clean domain name
+   */
+  formatDomain(url) {
+    if (!url) return "";
+
+    try {
+      const urlObj = new URL(url);
+      let domain = urlObj.hostname;
+      // Remove www. prefix if present
+      if (domain.startsWith("www.")) {
+        domain = domain.substring(4);
+      }
+      return domain;
+    } catch (e) {
+      // Fallback: strip protocol and www manually
+      return url
+        .replace(/^https?:\/\//, "")
+        .replace(/^www\./, "")
+        .split("/")[0];
+    }
+  }
+
+  /**
+   * Escape HTML to prevent XSS
+   * @param {string} text - Text to escape
+   * @returns {string} Escaped HTML string
+   */
+  escapeHtml(text) {
+    const div = document.createElement("div");
+    div.textContent = text;
+    return div.innerHTML;
+  }
+
+  /**
+   * Auto-initialize elements with data-webmention-list attribute
+   */
+  autoInit() {
+    const elements = document.querySelectorAll("[data-webmention-list]");
+
+    elements.forEach(async (element) => {
+      const targetUrl =
+        element.dataset.webmentionList || window.location.href;
+      const mentions = await this.fetch(targetUrl);
+      element.innerHTML = this.asCommaSeparatedList(mentions);
+    });
+  }
+}
+
+// Create global instance
+window.WebmentionUtils = new WebmentionUtils();
+
+// Auto-initialize on DOM ready
+if (document.readyState === "loading") {
+  document.addEventListener("DOMContentLoaded", () => {
+    window.WebmentionUtils.autoInit();
+  });
+} else {
+  window.WebmentionUtils.autoInit();
+}