Add Patient, Appointment, Medical Record, and Access Control Modules to Smart Contract

[shamil-t]

Add Appointment, Medical Record, and Access Control Modules to Smart Contract

Summary

Enhance the EHR smart contract to support:

• Appointment management
• Medical record management
• Doctor-patient access control
• Improved user management
• Event-driven architecture for frontend integration

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Features to Implement

1. User Management

Add support for:

• Admin
• Doctor
• Patient

Smart Contract Changes

• Add UserType enum
• Store user profile IPFS CID
• Prevent duplicate registrations
• Add getters for doctors/patients

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2. Appointment Module

Add Appointment Struct

Fields:

• appointmentId
• patient wallet
• doctor wallet
• metadata CID (IPFS)
• appointment time
• status
• created timestamp

Add Appointment Status Enum

Statuses:

• PENDING
• APPROVED
• REJECTED
• COMPLETED
• CANCELLED

Functions

• bookAppointment
• updateAppointmentStatus
• getAppointmentsByUser
• getAllAppointments

Storage Design

• Main appointment mapping by ID
• Doctor appointment indexes
• Patient appointment indexes

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3. Medical Records Module

Add MedicalRecord Struct

Fields:

• recordId
• patient wallet
• doctor wallet
• metadata CID
• file hash
• created timestamp

Functions

• uploadMedicalRecord
• getMedicalRecordsByUser
• getAllMedicalRecords

Storage Design

• Main medical record mapping by ID
• Patient record indexes
• Doctor record indexes

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4. Doctor Access Control

Features

Patients can:

• grant doctor access
• revoke doctor access

Doctors can:

• access patient records only when authorized

Storage

• mapping(patient => doctor => bool)

Functions

• grantDoctorAccess
• revokeDoctorAccess
• hasAccess

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IPFS Architecture

Blockchain Stores

• wallet addresses
• user role
• appointment references
• medical record references
• IPFS CIDs
• permissions

IPFS Stores

• patient profile JSON
• doctor profile JSON
• appointment metadata JSON
• medical record metadata
• medical files/PDFs

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Frontend Integration

Stack

• Angular
• ethers.js
• MetaMask
• Local Anvil node
• Local IPFS node

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Future Improvements

• encrypted IPFS payloads
• pagination
• hospital module
• audit logging
• prescription module
• role-based permissions
• The Graph indexing
• multisig admin
• signature verification

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Acceptance Criteria

• Admin can add doctors/patients
• Patients can book appointments
• Doctors can update appointment status
• Authorized doctors can upload records
• Patients can revoke access
• All entities retrievable by role
• IPFS CIDs stored properly