Implement Streaming Access Control

[enyinnaya1234]

Implement Streaming Access Control

Title

Create streaming access control system

Description

The platform requires functionality to control streaming access based on subscription status. Currently, the contract only handles ownership but doesn't distinguish between owned songs and streaming rights.

Requirements

• Implement function to check if a user can stream a specific song
• Differentiate between ownership rights and streaming rights
• Ensure only subscribed users can access streaming content
• Track streaming activity for potential royalty distributions

Implementation Details

• Create subscription management functions
• Track subscription status and expiration for users
• Handle Stark token payments for subscriptions
• Implement subscription renewal functionality

New functions to implement

fn subscribe(ref self: TContractState) -> bool;
fn check_subscription(self: @TContractState, user: ContractAddress) -> bool;
fn set_subscription_fee(ref self: TContractState, new_fee: u256);
fn renew_subscription(ref self: TContractState) -> bool;