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/* * Copyright 2011 ZXing authors//from w ww . j av a2s .com * * 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 com.google.zxing.client.android; import java.io.IOException; import java.io.InputStreamReader; import java.io.Reader; import java.net.HttpURLConnection; import java.net.URI; import java.net.URISyntaxException; import java.net.URL; import java.net.URLConnection; import java.util.Arrays; import java.util.Collection; import java.util.HashSet; import android.util.Log; /** * Utility methods for retrieving content over HTTP using the more-supported {@code java.net} classes in Android. */ public final class HttpHelper { private static final String TAG = HttpHelper.class.getSimpleName(); private static final Collection<String> REDIRECTOR_DOMAINS = new HashSet<String>(Arrays.asList("amzn.to", "bit.ly", "bitly.com", "fb.me", "goo.gl", "is.gd", "j.mp", "lnkd.in", "ow.ly", "R.BEETAGG.COM", "r.beetagg.com", "SCN.BY", "su.pr", "t.co", "tinyurl.com", "tr.im")); private HttpHelper() { } public enum ContentType { /** HTML-like content type, including HTML, XHTML, etc. */ HTML, /** JSON content */ JSON, /** XML */ XML, /** Plain text content */ TEXT, } /** * Downloads the entire resource instead of part. * * @see #downloadViaHttp(String, HttpHelper.ContentType, int) */ public static CharSequence downloadViaHttp(String uri, ContentType type) throws IOException { return downloadViaHttp(uri, type, Integer.MAX_VALUE); } /** * @param uri * URI to retrieve * @param type * expected text-like MIME type of that content * @param maxChars * approximate maximum characters to read from the source * @return content as a {@code String} * @throws IOException * if the content can't be retrieved because of a bad URI, network problem, etc. */ public static CharSequence downloadViaHttp(String uri, ContentType type, int maxChars) throws IOException { String contentTypes; switch (type) { case HTML: contentTypes = "application/xhtml+xml,text/html,text/*,*/*"; break; case JSON: contentTypes = "application/json,text/*,*/*"; break; case XML: contentTypes = "application/xml,text/*,*/*"; break; case TEXT: default: contentTypes = "text/*,*/*"; } return downloadViaHttp(uri, contentTypes, maxChars); } private static CharSequence downloadViaHttp(String uri, String contentTypes, int maxChars) throws IOException { int redirects = 0; while (redirects < 5) { URL url = new URL(uri); HttpURLConnection connection = safelyOpenConnection(url); connection.setInstanceFollowRedirects(true); // Won't work HTTP -> HTTPS or vice versa connection.setRequestProperty("Accept", contentTypes); connection.setRequestProperty("Accept-Charset", "utf-8,*"); connection.setRequestProperty("User-Agent", "ZXing (Android)"); try { int responseCode = safelyConnect(uri, connection); switch (responseCode) { case HttpURLConnection.HTTP_OK: return consume(connection, maxChars); case HttpURLConnection.HTTP_MOVED_TEMP: String location = connection.getHeaderField("Location"); if (location != null) { uri = location; redirects++; continue; } throw new IOException("No Location"); default: throw new IOException("Bad HTTP response: " + responseCode); } } finally { connection.disconnect(); } } throw new IOException("Too many redirects"); } private static String getEncoding(URLConnection connection) { String contentTypeHeader = connection.getHeaderField("Content-Type"); if (contentTypeHeader != null) { int charsetStart = contentTypeHeader.indexOf("charset="); if (charsetStart >= 0) { return contentTypeHeader.substring(charsetStart + "charset=".length()); } } return "UTF-8"; } private static CharSequence consume(URLConnection connection, int maxChars) throws IOException { String encoding = getEncoding(connection); StringBuilder out = new StringBuilder(); Reader in = null; try { in = new InputStreamReader(connection.getInputStream(), encoding); char[] buffer = new char[1024]; int charsRead; while (out.length() < maxChars && (charsRead = in.read(buffer)) > 0) { out.append(buffer, 0, charsRead); } } finally { if (in != null) { try { in.close(); } catch (IOException ioe) { // continue } catch (NullPointerException npe) { // another apparent Android / Harmony bug; continue } } } return out; } public static URI unredirect(URI uri) throws IOException { if (!REDIRECTOR_DOMAINS.contains(uri.getHost())) { return uri; } URL url = uri.toURL(); HttpURLConnection connection = safelyOpenConnection(url); connection.setInstanceFollowRedirects(false); connection.setDoInput(false); connection.setRequestMethod("HEAD"); connection.setRequestProperty("User-Agent", "ZXing (Android)"); try { int responseCode = safelyConnect(uri.toString(), connection); switch (responseCode) { case HttpURLConnection.HTTP_MULT_CHOICE: case HttpURLConnection.HTTP_MOVED_PERM: case HttpURLConnection.HTTP_MOVED_TEMP: case HttpURLConnection.HTTP_SEE_OTHER: case 307: // No constant for 307 Temporary Redirect ? String location = connection.getHeaderField("Location"); if (location != null) { try { return new URI(location); } catch (URISyntaxException e) { // nevermind } } } return uri; } finally { connection.disconnect(); } } private static HttpURLConnection safelyOpenConnection(URL url) throws IOException { URLConnection conn; try { conn = url.openConnection(); } catch (NullPointerException npe) { // Another strange bug in Android? Log.w(TAG, "Bad URI? " + url); throw new IOException(npe); } if (!(conn instanceof HttpURLConnection)) { throw new IOException(); } return (HttpURLConnection) conn; } private static int safelyConnect(String uri, HttpURLConnection connection) throws IOException { try { connection.connect(); } catch (NullPointerException npe) { // this is an Android bug: http://code.google.com/p/android/issues/detail?id=16895 throw new IOException(npe); } catch (IllegalArgumentException iae) { // Also seen this in the wild, not sure what to make of it. Probably a bad URL throw new IOException(iae); } catch (SecurityException se) { // due to bad VPN settings? Log.w(TAG, "Restricted URI? " + uri); throw new IOException(se); } catch (IndexOutOfBoundsException ioobe) { // Another Android problem? https://groups.google.com/forum/?fromgroups#!topic/google-admob-ads-sdk/U-WfmYa9or0 throw new IOException(ioobe); } try { return connection.getResponseCode(); } catch (NullPointerException npe) { // this is maybe this Android bug: http://code.google.com/p/android/issues/detail?id=15554 throw new IOException(npe); } catch (IllegalArgumentException iae) { // Again seen this in the wild for bad header fields in the server response! or bad reads Log.w(TAG, "Bad server status? " + uri); throw new IOException(iae); } catch (StringIndexOutOfBoundsException sioobe) { // Another Android bug: https://code.google.com/p/android/issues/detail?id=18856 throw new IOException(sioobe); } } }