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package tinker.net.dongliu.apk.parser;

import tinker.net.dongliu.apk.parser.bean.ApkSignStatus;
import tinker.net.dongliu.apk.parser.utils.Utils;

import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.*;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;


/**
 * ApkParser and result holder.
 * This class is not thread-safe.
 *
 * @author dongliu
 */
public class ApkParser extends AbstractApkParser implements Closeable {

    private ZipFile zf;
    private File apkFile;
    public ApkParser() {

    }
    public ApkParser(File apkFile) throws IOException {
        this.apkFile = apkFile;
        // create zip file cost time, use one zip file for apk parser life cycle
        this.zf = new ZipFile(apkFile);
    }

    public ApkParser(String filePath) throws IOException {
        this(new File(filePath));
    }

    @Override
    protected byte[] getCertificateData() throws IOException {
        ZipEntry entry = null;
        Enumeration enu = zf.entries();
        while (enu.hasMoreElements()) {
            ZipEntry ne = enu.nextElement();
            if (ne.isDirectory()) {
                continue;
            }
            if (ne.getName().toUpperCase().endsWith(".RSA") || ne.getName().toUpperCase().endsWith(".DSA")) {
                entry = ne;
                break;
            }
        }
        if (entry == null) {
            return null;
        }
        return Utils.toByteArray(zf.getInputStream(entry));
    }

    @Override
    public byte[] getFileData(String path) throws IOException {
        ZipEntry entry = zf.getEntry(path);
        if (entry == null) {
            return null;
        }

        InputStream inputStream = zf.getInputStream(entry);
        return Utils.toByteArray(inputStream);
    }


    @Override
    public ApkSignStatus verifyApk() throws IOException {
        ZipEntry entry = zf.getEntry("META-INF/MANIFEST.MF");
        if (entry == null) {
            // apk is not signed;
            return ApkSignStatus.notSigned;
        }

        JarFile jarFile = new JarFile(this.apkFile);
        Enumeration entries = jarFile.entries();
        byte[] buffer = new byte[8192];

        while (entries.hasMoreElements()) {
            JarEntry e = entries.nextElement();
            if (e.isDirectory()) {
                continue;
            }
            try (InputStream in = jarFile.getInputStream(e)) {
                // Read in each jar entry. A security exception will be thrown if a signature/digest check fails.
                int count;
                while ((count = in.read(buffer, 0, buffer.length)) != -1) {
                    // Don't care
                }
            } catch (SecurityException se) {
                return ApkSignStatus.incorrect;
            }
        }
        return ApkSignStatus.signed;
    }

    @Override
    public void close() throws IOException {
        super.close();
        zf.close();
    }
}