XenValidator 0.2.5

XenValidator is schema validation library for Python, You can Validate Strings, Numbers, Objects, Arrays, Dates, URLs, Ip addresses, regexes & more. You can even create your custom validators & use picks validator to validate a custom string value!

XenValidator is a powerful, flexible, and easy-to-use Python library for validating data structures. It simplifies the process of defining complex validation rules, handling cross-field dependencies, and providing informative error messages.

Features

Comprehensive Validation: Supports validation for strings, numbers, dates, arrays, urls, and custom data types.

Custom Error Handling: Easily customize error messages for various validation rules.

Flexible Date Formats: Supports multiple date formats to match various use cases.

Installation

Install XenValidator using pip:

    pip install xenvalidator

Example usage:

Import the package into to your app:

    from XenValidator import X, Object, ValidationError

Create and validate the schema.

    # Define your schema

    Schema = Object({
        "Name": X["STRING"](),
        "Age":  X["NUMBER"]().min(2),
        "Tags": X["ARRAY"](),
        "Role": X["PICK"](["admin", "member", "guest"]),
        "IsProMember": X["BOOLEAN"](),
        "Auth": Object({
            "Email": X["STRING"]().email().required(),
            "Password": X["STRING"]().min(8).max(64).required().message("Password is required and must be 8 characters long."),
            "IpAddress": X["IPADDRESS"]().required().message("Invalid IP address."),
            "JoinedOn": X["DATE"](),
        }),
        "SiteName": X["URL"](),
    })

    # Try to validate your schema
    try:
        Data = {
            "Name": "John Doe",
            "Age":  18,
            "Tags": ["Live streamer", "Web designer", "Front-end developer"],
            "Role": "admin",
            "IsProMember": False,
            "Auth": {
                "Email": "[e-mail]",
                "Password": "SecurePassword123&",
                "IpAddress": "127.0.0.1",
                "JoinedOn": "2024-11-05",
            },
            "SiteName": "https://mysite.com",
        }
        Schema.validate(Data)
        print("Data is valid:", Data)
    except ValidationError as e:
        print("Data is invalid:", e)

Explanation

• Name: Required field validated as a string.
• Age: Number field with a minimum value of 2.
• Tags: Array field validated to ensure it is indeed an array.
• IsProMember: Boolean field indicating if the user is a pro member.
• Auth: Nested object for authentication details.
  • Email: Required field validated as a valid email.
  • Password: Required string with length between 8 and 64 characters.
  • IpAddress: Required field validated as a valid IP address.
  • JoinedOn: Optional date field.
• SiteName: Optional field validated as a URL.

Validate a Regex value

You can use XenValidator's Regex validation to create TypeSafe Data types such as how many characters should it include and should it be Case Sensitive or not. You can use it to validate strong passwords and more.

    # Define your scheama & create a regex to match pattren with
    Schema = Object({
        # This regex requires at least 1 Uppercase & Lowercase letter and 1 Number & Must be 8 characters long
        "Regex": X["_REGEX"](r'^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[A-Za-z\d]{8,12}$'),
    })

    # Validate the ragex
    try:
        Data = {
            "Regex": "YourName123",
        }
        Schema.validate(Data)
        print("Valid regex:", Data)
    except ValidationError as e:
        print("Invalid regex:", e)

Create custom types to validate

    # Define a custom type to validate

    # This is a type which takes a positive number
    def isPositive(value):
        return isinstance(value, (int, float)) and value > 0

    # Define your schema
    Schema = Object({
        "Amount": X["CUSTOM"](isPositive).required().message("Amount must be positive."),
    })

    # Validate the Data
    try:
        Data = {
            "Amount": 10000  # Valid positive number (A negative number should return an error)
        }
        Schema.validate(Data)
        print("Valid amount:", Data)
    except ValidationError as e:
        print("Invalid amount:", e)

Additional Help

How to get an element's value from your schema

You can access element's value from the array to which you are trying to validate your schema.

    Data = {
        "Name": "John Doe",
        "Age":  18.5,
    }

    User_Name = Data["Name"]    # Getting the element's value by its name
    print(User_Name)   # Now this should print (John Doe)

Getting an element's value from an object / sub-schema

To get its value you should first get value of your (Object / Sub-Schema) & then you can get value from your sub-schema as follows.

    Data = {
        "Id": "Unique_User_Id178",
        "Details": Object({
            "Email": "[e-mail]",
            "Password": "Password123",
        })
    }

    User_Details = Data["Details"]    # Getting the Object / Sub-Schema's value by its name
    Email = User_Details["Email"]    # Getting the element's value by calling its Sub-Schema / Object
    print(Email)   # Now this will print ([e-mail])

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