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utils

This code is a utility module containing functions for class name manipulation, user type determination, and handling user information from cookies. Here's a breakdown of what each function does:

1. cn​

tip

This function simplifies working with conditional class names, ensuring that conflicting Tailwind CSS classes are merged correctly.

  • Purpose: Combines and merges CSS class names using clsx and tailwind-merge.
  • Parameters:
    • inputs: ClassValue[]: A list of class name values that can be strings, arrays, or objects.
  • Implementation:
    • Uses clsx to conditionally join class names.
    • Uses twMerge to handle Tailwind CSS class conflicts (e.g., bg-red-500 vs. bg-blue-500).
  • Output: A string of merged and resolved class names.

Example Usage:

cn("bg-red-500", "text-white", { "hover:bg-blue-500": true })
// Output: "bg-red-500 text-white hover:bg-blue-500"

2. isShortTerm​

This function helps in quickly classifying users based on their ID. Make sure the IDs are structured correctly, or the function might not behave as expected.

  • Purpose: Determines if a user ID corresponds to a short-term user.
  • Parameters:
    • uid: string: The user ID to check.
  • Implementation:
    • Checks if the uid string starts with "20".
  • Output:
    • Returns true if the user ID starts with "20", otherwise false.

Example Usage:

isShortTerm("20123456") // Output: true
isShortTerm("10123456") // Output: false

3. isLongTerm​

warning

Similar to isShortTerm, this function is critical for distinguishing between long-term and short-term users. Be cautious if user IDs might vary.

  • Purpose: Determines if a user ID corresponds to a long-term user.
  • Parameters:
    • uid: string: The user ID to check.
  • Implementation:
    • Checks if the uid string starts with "10".
  • Output:
    • Returns true if the user ID starts with "10", otherwise false.

Example Usage:

isLongTerm("10123456") // Output: true
isLongTerm("20123456") // Output: false

4. findStudenttype​

tip

This function combines the logic of isShortTerm and isLongTerm to classify users based on their ID, which is useful for conditional UI rendering.

  • Purpose: Identifies the type of student based on their user ID.
  • Parameters:
    • uid: string: The user ID to classify.
  • Implementation:
    • Uses isShortTerm and isLongTerm to check the uid:
      • Returns 1 if the user is short-term (uid starts with "20").
      • Returns 2 if the user is long-term (uid starts with "10").
      • Returns "Unknown" if neither condition is met.
  • Output: A number (1 or 2) or "Unknown".

Example Usage:

findStudenttype("20123456") // Output: 1
findStudenttype("10123456") // Output: 2
findStudenttype("30123456") // Output: "Unknown"

5. getUserFromCookie​

warning

Always ensure that decryptData is implemented securely, as it handles potentially sensitive information stored in cookies.

  • Purpose: Retrieves and parses user information from an encrypted cookie.
  • Parameters:
    • cookie: string | undefined: The encrypted cookie string (or undefined if not provided).
  • Implementation:
    1. Validation:
      • Checks if the cookie is provided. If not, logs a message and returns null.
    2. Decryption:
      • Uses decryptData(cookie) to decrypt the cookie value.
    3. Parsing:
      • Parses the decrypted string into a JavaScript object using JSON.parse.
    4. Error Handling:
      • If decryption or parsing fails, logs the error and returns null.
  • Output: Returns the parsed user object or null if there's an error.

Example Usage:

const cookie = "encrypted_string_here";
const user = getUserFromCookie(cookie);
// Output: { sid: "10123456", name: "John Doe", ... } (parsed user object)

External Dependencies​

tip

These external libraries enhance the functionality of your application, making class name manipulation and CSS conflict resolution seamless.

  1. clsx:
    • A utility for conditionally joining class names.
    • Docs
  2. tailwind-merge:
    • Resolves conflicts between Tailwind CSS class names.
    • Docs
  3. decryptData:
    • A function (presumably defined elsewhere) to decrypt the cookie string.

Use Cases​

  1. cn:
    tip

    This function is ideal for situations where you need to dynamically adjust classes based on certain conditions (e.g., for responsive design, toggling classes based on state).

    • Simplifies and resolves class name combinations for Tailwind CSS.
  2. isShortTerm & isLongTerm:
    warning

    Be cautious about user ID structure. If the IDs deviate, the functions may produce incorrect results.

    • Classifies users based on ID prefixes, useful for rendering UI or applying specific logic.
  3. findStudenttype:

    A great utility to determine student types and apply custom logic based on their classification. Ensure IDs are well-structured to avoid errors.

    • Determines the category of a student for conditional behavior or display purposes.
  4. getUserFromCookie:
    tip

    Ideal for session management or user authentication, this function extracts and parses encrypted data to handle user-specific logic.

    • Extracts and parses user details from an encrypted cookie, often used for authentication or session management.

Security Considerations​

  1. Secure Decryption:
    warning

    Ensure that decryptData is implemented securely. Exposing decrypted data without proper validation could lead to security vulnerabilities.

    • Ensure decryptData is implemented securely to handle sensitive information in cookies.
  2. Validate User Data:
    tip

    Always sanitize and validate the parsed user object to prevent potential injection attacks or manipulation of sensitive data.

    • Validate and sanitize the parsed user object to avoid potential security issues like code injection.