ASN1 mobile provision parser using DTFoundation

DTMobileProvision.swift

struct MobileProvision {
    private let dict: [String: Any]?

    init() {
        let mpURL = Bundle.main.bundleURL.appendingPathComponent("embedded.mobileprovision")
        guard let data = try? Data(contentsOf: mpURL) else {
            dict = nil
            return
        }

        let parser = ASN1ParserDelegate(data: data)
        dict = parser.parse()

        print(dict)
    }
}

fileprivate class ASN1ParserDelegate: NSObject {
    private let parser: DTASN1Parser
    private var currentObjectIdentifier: String?

    var dict: [String: Any]?

    init(data: Data) {
        self.parser = DTASN1Parser(data: data)
        super.init()
        self.parser.delegate = self
    }

    func parse() -> [String: Any]? {
        guard parser.parse() else { return nil }

        return dict
    }
}

extension ASN1ParserDelegate: DTASN1ParserDelegate {
    func parser(_ parser: DTASN1Parser!, foundObjectIdentifier objIdentifier: String!) {
        currentObjectIdentifier = objIdentifier
    }

    func parser(_ parser: DTASN1Parser!, found data: Data!) {
        guard currentObjectIdentifier == "1.2.840.113549.1.7.1" else { return }

        currentObjectIdentifier = nil
        do {
            dict = try PropertyListSerialization.propertyList(
                from: data,
                options: [],
                format: nil
            ) as? [String: Any]
        } catch {
            log(.error, error, tag: String(describing: type(of: self)))
        }
    }
}