com.uid2.shared.cloud.URLStorageWithMetadata Maven / Gradle / Ivy

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package com.uid2.shared.cloud;

import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.Proxy;
import java.net.URL;
import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;

public abstract class URLStorageWithMetadata implements ICloudStorage {
    private final Proxy proxy;

    public URLStorageWithMetadata() {
        this(null);
    }

    public URLStorageWithMetadata(Proxy proxy) {
        this.proxy = proxy;
    }

    @Override
    public void upload(String localPath, String cloudPath) throws CloudStorageException {
        // this is a read-only cloud storage
        throw new UnsupportedOperationException("URLStorageWithMetadata::upload method is not supported");
    }

    @Override
    public void upload(InputStream input, String cloudPath) throws CloudStorageException {
        // this is a read-only cloud storage
        throw new UnsupportedOperationException("URLStorageWithMetadata::upload method is not supported");
    }

    @Override
    public InputStream download(String cloudPath) throws CloudStorageException {
        try {
            URL url = new URL(cloudPath);

            if (this.proxy != null) {
                return url.openConnection(proxy).getInputStream();
            } else {
                return url.openStream();
            }
        } catch (Throwable t) {
            // Do not log the message or the original exception as that may contain the pre-signed url
            throw new CloudStorageException("url download error: " + t.getClass().getSimpleName());
        }
    }

    @Override
    public void delete(String cloudPath) throws CloudStorageException {
        // this is a read-only cloud storage
        throw new UnsupportedOperationException("URLStorageWithMetadata::upload method is not supported");
    }

    @Override
    public void delete(Collection cloudPath) throws CloudStorageException {
        // this is a read-only cloud storage
        throw new UnsupportedOperationException("URLStorageWithMetadata::upload method is not supported");
    }

    @Override
    public List list(String prefix) throws CloudStorageException {
        // TODO improve prefix matching
        return extractListFromMetadata().stream()
            .filter(url -> url.contains(prefix))
            .collect(Collectors.toList());
    }

    @Override
    public URL preSignUrl(String cloudPath) throws CloudStorageException {
        throw new UnsupportedOperationException("URLStorageWithMetadata::preSignUrl method is not supported");
    }

    @Override
    public void setPreSignedUrlExpiry(long expiry) {
        throw new UnsupportedOperationException("PreSignedURLStorage::setPreSignedUrlExpiry method is not supported");
    }

    @Override
    public String mask(String cloudPath) {
        try {
            URL url = new URL(cloudPath);
            return cloudPath.replace("?" + url.getQuery(), "");
        } catch (MalformedURLException e) {
            return cloudPath;
        }
    }

    protected abstract List extractListFromMetadata() throws CloudStorageException;
}