Feat Created Decentralized Marketplace Contract - #277
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Adds support for listing expiration tracking by adding the expires_at: u64 field to the Listing struct. This is the foundational change for auto-expiration and auto-delisting functionality.
Adds foundational infrastructure for auction system: - New storage keys: AUCTION_CTR_KEY, AUCTION_PREFIX - Helper functions: next_auction_id, auction_key - Integrates with existing stellai_lib Auction struct - Prepares contract for full auction implementation
Implements core auction bidding functionality: - create_auction: Creates new auctions with configurable parameters - place_bid: Validates and records bids with minimum increment checks - record_bid: Updates auction state with new bid information - Auto-refunds outbid bidders to ensure proper fund management
Adds two critical marketplace systems: 1. Offer system: make_offer, accept_offer, reject_offer with expiration 2. Dispute system: open_dispute, resolve_dispute with admin-only arbitration - Storage keys: OFFER_CTR_KEY, DISPUTE_CTR_KEY, OFFER_PREFIX, DISPUTE_PREFIX - Helper functions: next_offer_id, next_dispute_id, offer_key, dispute_key
Completes marketplace feature set with: - Transaction history tracking: record_transaction, get_user_transactions - Platform fee configuration: set_platform_fee, configurable 2.5% default - Royalty distribution enforcement in all sale workflows - Listing auto-expiration: cleanup_expired_listings - Transaction analytics functions (placeholder implementation) - All event publishing for frontend integration - Fixes all ownership and compilation errors, contract builds successfully
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Closes #268