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Library that provides client access to the FIT-Connect api-endpoints for sending, subscribing and routing
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package dev.fitko.fitconnect.api.domain.zbp;

import com.nimbusds.jose.JOSEException;
import com.nimbusds.jose.jwk.JWK;
import com.nimbusds.jose.jwk.RSAKey;
import lombok.Value;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;

@Value
public class AuthorKeyPair {

    RSAKey authorPrivateKey;
    String authorCertificateAsPem;

    private AuthorKeyPair(RSAKey authorPrivateKey, String authorCertificateAsPem) {
        this.authorPrivateKey = authorPrivateKey;
        this.authorCertificateAsPem = authorCertificateAsPem;
    }

    public static AuthorKeyPairBuilder builder() {
        return new AuthorKeyPairBuilder();
    }

    public static class AuthorKeyPairBuilder {
        private String authorCertificateAsPem;
        private RSAKey authorPrivateKey;

        AuthorKeyPairBuilder() {
        }

        /**
         * Set authors client certificate as {@link Path}.
         *
         * @param authorCertificatePath path to the public certificate in PEM format
         * @return AuthorKeyPairBuilder
         */
        public AuthorKeyPairBuilder authorCertificatePath(Path authorCertificatePath) {
            this.authorCertificateAsPem = getPemFromPath(authorCertificatePath);
            return this;
        }

        /**
         * Set authors client certificate as PEM string.
         *
         * @param authorCertificateAsPem PEM string of the public certificate
         * @return AuthorKeyPairBuilder
         */
        public AuthorKeyPairBuilder authorCertificateAsPem(String authorCertificateAsPem) {
            getKeyFromPemString(authorCertificateAsPem);
            this.authorCertificateAsPem = authorCertificateAsPem;
            return this;
        }

        /**
         * Set authors private key as {@link Path}.
         *
         * @param authorPrivateKeyPath path to the private key in PEM format
         * @return AuthorKeyPairBuilder
         */
        public AuthorKeyPairBuilder authorPrivateKeyPath(Path authorPrivateKeyPath) {
            this.authorPrivateKey = getKeyFromPath(authorPrivateKeyPath);
            return this;
        }

        /**
         * Set authors private key as PEM string.
         *
         * @param authorPrivateKeyAsPem PEM string of the private key
         * @return AuthorKeyPairBuilder
         */
        public AuthorKeyPairBuilder authorPrivateKeyAsPem(String authorPrivateKeyAsPem) {
            this.authorPrivateKey = getKeyFromPemString(authorPrivateKeyAsPem);
            return this;
        }

        /**
         * Set authors private key.
         *
         * @param authorPrivateKey private key as {@link RSAKey}
         * @return AuthorKeyPairBuilder
         */
        public AuthorKeyPairBuilder authorPrivateKey(RSAKey authorPrivateKey) {
            this.authorPrivateKey = authorPrivateKey;
            return this;
        }

        public AuthorKeyPair build() {
            return new AuthorKeyPair(this.authorPrivateKey, this.authorCertificateAsPem);
        }

        private RSAKey getKeyFromPath(Path path) {
            try {
                final String pemObject = Files.readString(path);
                return getKeyFromPemString(pemObject);
            } catch (IOException e) {
                throw new RuntimeException("Failed reading path to PEM", e);
            }
        }

        private String getPemFromPath(Path path) {
            try {
                final String pemObject = Files.readString(path);
                // read as key for validation
                getKeyFromPemString(pemObject);
                return pemObject;
            } catch (IOException e) {
                throw new RuntimeException("Failed reading PEM", e);
            }
        }

        private RSAKey getKeyFromPemString(String pemObject) {
            try {
                return JWK.parseFromPEMEncodedObjects(pemObject).toRSAKey();
            } catch (JOSEException e) {
                throw new RuntimeException("Failed parsing PEM", e);
            }
        }
    }
}