Feat: Implement Funding Operations

[psychemist]

🚀 Boundless Project Funding Pull Request

• Closes Implement Funding Operations in Boundless Contract #2
• Added tests
• Run tests
• Run formatting
• Evidence attached
• Commented code

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📌 Type of Change

• Documentation (updates to README, docs, or comments)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

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📝 Changes description

This PR implements a comprehensive multi-token funding system for the Boundless platform. The implementation provides a robust, flexible framework for project creators to receive funding in various token types while ensuring proper accounting and refund mechanisms.

Key Features Implemented:

1. Multi-Token Support:

   • Projects can now accept funding in multiple whitelisted tokens
   • Token-specific contributions are tracked separately
   • Total funding is aggregated across all tokens

2. Flexible Token Whitelisting:

   • Admin can whitelist tokens for each project
   • Validation mechanism ensures only approved tokens can be used
   • Storage-efficient token tracking

3. Enhanced Backer Management:

   • Track backers' contributions by token type
   • Support for multiple contributions from the same backer
   • Maintain aggregated view of total backer support

4. Token-Specific Refunds:

   • Process refunds for each token separately
   • Efficient refund mechanism to minimize gas costs
   • Protection against duplicate refunds

5. Secure Contribution Handling:

   • Validation of funding periods
   • Proper authentication for all financial operations
   • Clear error handling for funding failures

6. Storage Optimizations:

   • Efficient storage structure for token contributions
   • Minimal storage overhead for multi-token support
   • Clear separation of token-specific data

7. Comprehensive Testing:

   • Added tests for all multi-token scenarios
   • Edge case handling for token-specific operations
   • Verification of proper accounting across tokens

Technical Implementation Details:

• Added token validation against whitelisted tokens
• Implemented separate storage for token-specific contributions
• Updated refund logic to process token-specific refunds
• Improved error handling for token-related operations
• Added utility functions for token contribution management

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📸 Evidence (A photo is required as evidence)

• stellar contract build

• cargo build

• cargo test

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🌌 Comments

Challenges Faced

• Implementing token-specific contribution tracking while maintaining a coherent total funding view required careful design of the storage model.

• The refund process needed significant updates to handle token-specific refunds while preventing double refunds and ensuring proper accounting.

• Supporting multiple contributions from the same backer across different tokens presented challenges in contribution aggregation and reporting.

Future Improvements

1. Project Total Funded Amount: This should be refactored to track total contributions per project

2. Token Value Normalization: Add support for normalizing contributions across different tokens based on real-time exchange rates.

3. Partial Refunds: Implement partial refund functionality for specific scenarios where full refunds are not required.

4. Token Allowlist Management: Create a more sophisticated token allowlist system with time-based restrictions or volume caps.

5. Enhanced Token Metadata: Store additional token metadata for better UI/UX in the client applications.

6. Advanced Analytics: Add features to track funding patterns across different tokens.

The implementation follows Soroban contract best practices and includes extensive testing to ensure reliability and security of the multi-token funding system.

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[0xdevcollins]

Any progress @psychemist

[psychemist]

@0xdevcollins i'll push some changes tonight

[0xdevcollins]

Hi any update?

[psychemist]

@0xdevcollins yes. still testing. how do i reach out on TG?

[0xdevcollins]

https://t.me/devcollinss

[psychemist]

@0xdevcollins reasdy for review

[0xdevcollins]

@psychemist I will review and merge today. Thanks