mobisocial.nfcserver.handler.HttpFileHandler.java Source code

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Here is the source code for mobisocial.nfcserver.handler.HttpFileHandler.java

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/*
 * Copyright (C) 2011 Stanford University MobiSocial Lab
 * http://mobisocial.stanford.edu
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package mobisocial.nfcserver.handler;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.URI;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import com.android.apps.tag.record.UriRecord;

import mobisocial.nfc.NdefHandler;
import mobisocial.nfc.PrioritizedHandler;
import mobisocial.util.Log;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;

/**
 * Looks for certain file types served over HTTP and attempts to
 * download and open them.
 *
 */
public class HttpFileHandler implements NdefHandler, PrioritizedHandler {
    public static final String TAG = "ndefserver";

    public int handleNdef(NdefMessage[] ndefMessages) {
        URI page = null;
        NdefRecord firstRecord = ndefMessages[0].getRecords()[0];
        if (UriRecord.isUri(firstRecord)) {
            page = UriRecord.parse(firstRecord).getUri();
        }

        try {
            if (page != null && (page.getScheme().startsWith("http"))) {
                System.out.println("trying to get " + page);
                if (page.getPath() == null || !page.toString().contains(".")) {
                    return NDEF_PROPAGATE;
                }

                try {
                    String extension = page.toString().substring(page.toString().lastIndexOf(".") + 1);
                    if (!MimeTypeHandler.MIME_EXTENSIONS.containsValue(extension)) {
                        return NDEF_PROPAGATE;
                    }

                    // Download content
                    System.out.println("Downloading " + extension + " file.");
                    HttpGet httpGet = new HttpGet(page);
                    HttpClient httpClient = new DefaultHttpClient();
                    HttpResponse httpResponse = httpClient.execute(httpGet);
                    HttpEntity entity = httpResponse.getEntity();
                    InputStream content = entity.getContent();

                    File fileOut = new File("nfcfiles/" + System.currentTimeMillis() + "." + extension);
                    fileOut.getParentFile().mkdirs();
                    FileOutputStream fileOutStream = new FileOutputStream(fileOut);
                    BufferedOutputStream buffered = new BufferedOutputStream(fileOutStream);
                    byte[] buf = new byte[1024];
                    while (true) {
                        int r = content.read(buf);
                        if (r <= 0)
                            break;
                        buffered.write(buf, 0, r);
                    }
                    buffered.close();
                    fileOutStream.close();

                    MimeTypeHandler.openFile(fileOut);
                    return NDEF_CONSUME;
                } catch (Exception e) {
                    e.printStackTrace();
                    return NDEF_PROPAGATE;
                }
            }
        } catch (Exception e) {
            Log.e(TAG, "Error launching page", e);
        }
        return NDEF_PROPAGATE;
    }

    //@Override
    public int getPriority() {
        return HttpUrlHandler.HTTP_URL_PRIORITY - 1;
    }
}