MCCustomSkinLoader/Common/source/customskinloader/utils/HttpTextureUtil.java

package customskinloader.utils;

import java.io.File;

import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.io.FilenameUtils;

import customskinloader.CustomSkinLoader;

public class HttpTextureUtil {
    public static class HttpTextureInfo {
        public String url = "";
        public File cacheFile;
        public String hash;
    }

    private static final String
            LEGACY_MARK = "(LEGACY)",
            LOCAL_MARK = "(LOCAL)",
            LOCAL_LEGACY_MARK = "(LOCAL_LEGACY)",
            BASE64_MARK = "(BASE64)";
    public static File defaultCacheDir;

    @SuppressWarnings("ResultOfMethodCallIgnored")
    public static void cleanCacheDir() {
        if (defaultCacheDir != null) {
            defaultCacheDir.delete();
            defaultCacheDir.mkdirs();
        }
    }

    public static File getCacheDir() {
        return defaultCacheDir == null ? new File(MinecraftUtil.getMinecraftDataDir(), "assets/skins") : defaultCacheDir;
    }

    public static HttpTextureInfo toHttpTextureInfo(String fakeUrl) {
        HttpTextureInfo info = new HttpTextureInfo();
        if (fakeUrl.startsWith("http")) {
            info.url = fakeUrl;
            info.hash = FilenameUtils.getBaseName(fakeUrl);
            info.cacheFile = getCacheFile(info.hash);
            return info;
        }
        if (fakeUrl.startsWith(LOCAL_LEGACY_MARK)) {
            fakeUrl = fakeUrl.replace(LOCAL_LEGACY_MARK, "");
            String[] t = fakeUrl.split(",", 2);
            if (t.length != 2)
                return info;
            info.cacheFile = new File(CustomSkinLoader.DATA_DIR, t[1]);
            info.hash = t[0];
            return info;
        }
        if (fakeUrl.startsWith(LOCAL_MARK)) {
            fakeUrl = fakeUrl.replace(LOCAL_MARK, "");
            info.cacheFile = new File(CustomSkinLoader.DATA_DIR, fakeUrl);
            info.hash = FilenameUtils.getBaseName(fakeUrl);
            return info;
        }
        if (fakeUrl.startsWith(LEGACY_MARK)) {
            fakeUrl = fakeUrl.replace(LEGACY_MARK, "");
            info.url = fakeUrl;
            info.hash = DigestUtils.sha1Hex(info.url);
            info.cacheFile = HttpRequestUtil.getCacheFile(info.hash);
            return info;
        }
        //Base64 fake url format: `(BASE64)${hash}`
        if (fakeUrl.startsWith(BASE64_MARK)) {
            fakeUrl = fakeUrl.replace(BASE64_MARK, "");
            info.hash = fakeUrl;
            info.cacheFile = HttpRequestUtil.getCacheFile(info.hash);
            return info;
        }
        return info;
    }

    public static String getLegacyFakeUrl(String url) {
        return LEGACY_MARK + url;
    }

    public static String getLocalFakeUrl(String path) {
        return LOCAL_MARK + path;
    }

    public static String getLocalLegacyFakeUrl(String path, String hash) {
        return LOCAL_LEGACY_MARK + hash + "," + path;
    }

    public static String getBase64FakeUrl(String hash) {
        return BASE64_MARK + hash;
    }

    public static String getHash(String url, long size, long lastModified) {
        return DigestUtils.sha1Hex(size + url + lastModified);
    }

    public static String getHash(String base64) {
        return DigestUtils.sha1Hex(base64);
    }

    public static File getCacheFile(String hash) {
        return getCacheFile(defaultCacheDir, hash);
    }

    public static File getCacheFile(File cacheDir, String hash) {
        return new File(new File(cacheDir, hash.length() > 2 ? hash.substring(0, 2) : "xx"), hash);
    }
}