first version

web.py

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+import tempfile
+import hashlib
+from io import BytesIO
+from flask import (
+    Flask, jsonify, redirect, request, render_template, send_file, url_for, safe_join
+)
+from werkzeug.utils import secure_filename
+from convert import convert_epub, s2t
+from pathlib import Path
+
+app = Flask(__name__)
+app.config['JSON_AS_ASCII'] = False
+app.config['MAX_CONTENT_LENGTH'] = 20 * 1024 * 1024
+
+def human_file_size(bytes_count):
+    threshold = 1024
+    units = ['KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB']
+    if bytes_count < threshold:
+        return f"{bytes_count} B"
+
+    ui = -1
+    while True:
+        bytes_count /= threshold
+        ui += 1
+        if bytes_count < threshold or ui == (len(units) - 1):
+            break
+
+    return f"{round(bytes_count, 1)} {units[ui]}"
+
+@app.route("/", methods=["GET"])
+def render_index():
+    limit = app.config["MAX_CONTENT_LENGTH"]
+    return render_template("index.html.j2", limit=limit, limit_human_readable=human_file_size(limit))
+
+@app.route('/api/convert', methods=["POST"])
+def upload_epub_sync():
+    if 'upload' not in request.files:
+        return jsonify({"status": False, "error": "No file is specified."}), 400
+
+    epub_file = request.files['upload']
+
+    if epub_file.filename == '':
+        return jsonify({"status": False, "error": "No file name."}), 400
+
+    # https://stackoverflow.com/questions/283707/size-of-an-open-file-object/283719#283719
+    epub_file.seek(0, 2)
+    end_position = epub_file.tell()
+    if end_position > app.config['MAX_CONTENT_LENGTH']:
+        return jsonify({"status": False, "error": f"File is too large. Maxium file size is {human_file_size(app.config['MAX_CONTENT_LENGTH'])}"}), 413
+
+    if epub_file and Path(epub_file.filename).suffix == ".epub":
+        output_buffer = BytesIO()
+        try:
+            _result = convert_epub(epub_file, output_buffer)
+            print(f"Converted Successfully. File: {s2t(epub_file.filename)}")
+            output_buffer.seek(0)
+            return send_file(output_buffer, as_attachment=True, attachment_filename=s2t(epub_file.filename))
+        except Exception as e:
+            error_class = e.__class__.__name__
+            return jsonify({"status": False, "error": error_class}), 500
+    else:
+        return jsonify({"status": False, "error": "Not an epub document"}), 415 # Unsupported Media Type
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", debug=True)