CxIDE/Services/CredentialStore.swift

// CredentialStore.swift
// CxIDE — Encrypted .env file credential management
//
// Stores API keys and secrets in an AES-256 encrypted .env file
// within the workspace. Never stores credentials in plain text in source.

import Foundation
import CryptoKit

// MARK: - Credential Store

final class CredentialStore: @unchecked Sendable {
    static let shared = CredentialStore()

    private let fileName = ".cxide-credentials.enc"
    private var cachedCredentials: [String: String] = [:]
    private let lock = NSLock()

    // Derive encryption key from machine-specific seed + app bundle ID
    private var encryptionKey: SymmetricKey {
        let seed = ProcessInfo.processInfo.hostName
            + (Bundle.main.bundleIdentifier ?? "com.cxide.CxIDE")
            + NSUserName()
        let hash = SHA256.hash(data: Data(seed.utf8))
        return SymmetricKey(data: hash)
    }

    // MARK: - Public API

    /// Load credentials from encrypted file in the given directory
    func load(from directory: URL) throws {
        let fileURL = directory.appendingPathComponent(fileName)
        guard FileManager.default.fileExists(atPath: fileURL.path) else {
            lock.lock()
            cachedCredentials = [:]
            lock.unlock()
            return
        }

        let encryptedData = try Data(contentsOf: fileURL)
        let sealedBox = try AES.GCM.SealedBox(combined: encryptedData)
        let decrypted = try AES.GCM.open(sealedBox, using: encryptionKey)
        let json = try JSONSerialization.jsonObject(with: decrypted) as? [String: String] ?? [:]

        lock.lock()
        cachedCredentials = json
        lock.unlock()
    }

    /// Save current credentials to encrypted file
    func save(to directory: URL) throws {
        let fileURL = directory.appendingPathComponent(fileName)

        lock.lock()
        let creds = cachedCredentials
        lock.unlock()

        let json = try JSONSerialization.data(withJSONObject: creds, options: .sortedKeys)
        let sealedBox = try AES.GCM.seal(json, using: encryptionKey)
        guard let combined = sealedBox.combined else {
            throw CredentialError.encryptionFailed
        }
        try combined.write(to: fileURL)

        // Set restrictive permissions (owner read/write only)
        try FileManager.default.setAttributes(
            [.posixPermissions: 0o600],
            ofItemAtPath: fileURL.path
        )
    }

    /// Get a credential value
    func get(_ key: String) -> String? {
        lock.lock()
        defer { lock.unlock() }
        return cachedCredentials[key]
    }

    /// Set a credential value
    func set(_ key: String, value: String) {
        lock.lock()
        cachedCredentials[key] = value
        lock.unlock()
    }

    /// Remove a credential
    func remove(_ key: String) {
        lock.lock()
        cachedCredentials.removeValue(forKey: key)
        lock.unlock()
    }

    /// List all credential keys (not values)
    func keys() -> [String] {
        lock.lock()
        defer { lock.unlock() }
        return Array(cachedCredentials.keys).sorted()
    }

    /// Check if a credential exists
    func has(_ key: String) -> Bool {
        lock.lock()
        defer { lock.unlock() }
        return cachedCredentials[key] != nil
    }

    /// Remove the encrypted file
    func deleteStore(in directory: URL) throws {
        let fileURL = directory.appendingPathComponent(fileName)
        if FileManager.default.fileExists(atPath: fileURL.path) {
            try FileManager.default.removeItem(at: fileURL)
        }
        lock.lock()
        cachedCredentials = [:]
        lock.unlock()
    }

    // MARK: - Convenience: GoDaddy

    /// GoDaddy OTE (test environment) credentials
    var godaddyOTEKey: String? { self.get("GODADDY_OTE_KEY") }
    var godaddyOTESecret: String? { self.get("GODADDY_OTE_SECRET") }

    /// GoDaddy Production credentials
    var godaddyProdKey: String? { self.get("GODADDY_PROD_KEY") }
    var godaddyProdSecret: String? { self.get("GODADDY_PROD_SECRET") }

    /// Set GoDaddy OTE credentials
    func setGoDaddyOTE(key: String, secret: String) {
        set("GODADDY_OTE_KEY", value: key)
        set("GODADDY_OTE_SECRET", value: secret)
    }

    /// Set GoDaddy Production credentials
    func setGoDaddyProduction(key: String, secret: String) {
        set("GODADDY_PROD_KEY", value: key)
        set("GODADDY_PROD_SECRET", value: secret)
    }

    // MARK: - Errors

    enum CredentialError: LocalizedError {
        case encryptionFailed
        case decryptionFailed
        case invalidFormat

        var errorDescription: String? {
            switch self {
            case .encryptionFailed: return "Failed to encrypt credentials"
            case .decryptionFailed: return "Failed to decrypt credentials"
            case .invalidFormat: return "Invalid credential file format"
            }
        }
    }
}