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+;;; my-epub.el -- epub utils -*- lexical-binding: t -*-
+
+;; Copyright (C) 2025  Free Software Foundation, Inc.
+
+;; Author: Yuchen Pei <id@ypei.org>
+;; Package-Requires: ((emacs "30.1"))
+
+;; This file is part of dotted.
+
+;; dotted is free software: you can redistribute it and/or modify it under
+;; the terms of the GNU Affero General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; dotted is distributed in the hope that it will be useful, but WITHOUT
+;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+;; or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General
+;; Public License for more details.
+
+;; You should have received a copy of the GNU Affero General Public
+;; License along with dotted.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; epub utils.
+
+;;; Code:
+
+
+(defun my-epub-content-file-name (file-name)
+  (with-temp-buffer
+    (if (eq 0 (call-process "unzip" nil t nil
+                            "-p" file-name "META-INF/container.xml"))
+        (let ((dom (libxml-parse-xml-region (point-min) (point-max))))
+          (dom-attr
+           (dom-by-tag
+            (dom-by-tag (dom-by-tag dom 'container) 'rootfiles)
+            'rootfile)
+           'full-path))
+      (message "Failed to extract container.xml: %s" (buffer-string))
+      nil)))
+
+(defun my-epub-metadata (file-name)
+  "Get metadata of an epub file."
+  (when-let ((content-file-name (my-epub-content-file-name file-name)))
+    (with-temp-buffer
+      (call-process "unzip" nil t nil "-p" file-name content-file-name)
+      (let* ((dom (libxml-parse-xml-region (point-min) (point-max)))
+             (metadata (dom-by-tag dom 'metadata))
+             (title (dom-text (dom-by-tag metadata 'title)))
+             (authors (dom-texts (dom-by-tag metadata 'creator) ", "))
+             (identifier
+              (replace-regexp-in-string
+               "[^0-9,]" ""
+               (dom-texts
+                (seq-filter
+                 (lambda (node)
+                   (or (equal "ISBN" (dom-attr node 'scheme))
+                       (string-match-p "^[0-9]+$" (dom-text node))))
+                 (dom-by-tag metadata 'identifier))
+                ",")))
+             (date (replace-regexp-in-string
+                    "[^0-9]" ""
+                    (dom-text (dom-by-tag metadata 'date))))
+             (year (substring date 0 (min 4 (length date)))))
+        `((title . ,title)
+          (authors . ,authors)
+          (year . ,year)
+          (identifier . ,identifier))
+        ;; (pp metadata)
+        ))
+    ))
+
+(provide 'my-epub)
+;;; my-epub.el ends here