python server xml validator via xsd

xml_validator.py

from flask import Flask, request, jsonify
from lxml import etree

app = Flask(__name__)

def validate_xml_against_xsd(xml_content, xsd_content):
    # Attempt to parse the XML content
    try:
        xml_doc = etree.fromstring(xml_content)
    except etree.XMLSyntaxError as e:
        return {
            "ok": False,
            "generalError": f"XML parsing error: {str(e)}",
            "validationErrors": []
        }

    # Attempt to parse and validate against the XSD content
    try:
        schema_root = etree.XML(xsd_content)
        schema = etree.XMLSchema(schema_root)
        schema.assertValid(xml_doc)
        # No validation errors
        return {
            "ok": True,
            "generalError": "",
            "validationErrors": []
        }
    except etree.XMLSyntaxError as e:
        # Handle XSD parsing errors
        return {
            "ok": False,
            "generalError": f"XSD parsing error: {str(e)}",
            "validationErrors": []
        }
    except etree.DocumentInvalid as e:
        # Capture validation errors
        validation_errors = [
            {
                "id": f"line{error.line}_col{error.column}",
                "type": error.type,
                "line": error.line,
                "column": error.column,
                "message": error.message,
                "domain": error.domain_name,
                "level": error.level_name
            }
            for error in e.error_log
        ]
        return {
            "ok": False,
            "generalError": "",
            "validationErrors": validation_errors
        }

@app.route('/validate', methods=['POST'])
def validate():
    # Check if files are provided in the request
    if 'xml' not in request.files or 'xsd' not in request.files:
        return jsonify({
            "ok": False,
            "generalError": "Please provide one XML file and one XSD file under the keys 'xml' and 'xsd'.",
            "validationErrors": []
        }), 400

    # Read XML and XSD file contents
    xml_file = request.files['xml']
    xsd_file = request.files['xsd']
    xml_content = xml_file.read()
    xsd_content = xsd_file.read()

    # Perform validation and structure the result
    result = validate_xml_against_xsd(xml_content, xsd_content)

    # Return JSON result with consistent structure
    return jsonify(result)

if __name__ == '__main__':
    app.run(debug=False)