Java tutorial
/* * Copyright (C) 2008 Esmertec AG. * Copyright (C) 2008 The Android Open Source Project * * 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.moez.QKSMS.model; import android.content.Context; import android.preference.PreferenceManager; import android.util.Log; import com.google.android.mms.ContentType; import com.google.android.mms.MmsException; import com.google.android.mms.pdu_alt.PduBody; import com.google.android.mms.pdu_alt.PduPart; import com.moez.QKSMS.LogTag; import com.moez.QKSMS.MmsConfig; import org.json.JSONArray; import org.json.JSONObject; import org.w3c.dom.smil.SMILMediaElement; import org.w3c.dom.smil.SMILRegionElement; import org.w3c.dom.smil.SMILRegionMediaElement; import org.w3c.dom.smil.Time; import org.w3c.dom.smil.TimeList; import java.io.IOException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.ArrayList; import java.util.Collections; public class MediaModelFactory { private static final String TAG = "Mms:media"; private static final boolean LOCAL_LOGV = false; /** * Returns the media model for the given SMILMediaElement in the PduBody. * * @param context Context * @param sme The SMILMediaElement to find * @param srcs String array of sources * @param layouts LayoutModel * @param pb PduBuddy * @return MediaModel * @throws IOException * @throws IllegalArgumentException * @throws MmsException */ public static MediaModel getMediaModel(Context context, SMILMediaElement sme, ArrayList<String> srcs, LayoutModel layouts, PduBody pb) throws IOException, IllegalArgumentException, MmsException { String tag = sme.getTagName(); String src = sme.getSrc(); PduPart part = findPart(context, pb, src, srcs); if (sme instanceof SMILRegionMediaElement) { return getRegionMediaModel(context, tag, src, (SMILRegionMediaElement) sme, layouts, part); } else { return getGenericMediaModel(context, tag, src, sme, part, null); } } /** * This method is meant to identify the part in the given PduBody that corresponds to the given * src string. * * Essentially, a SMIL MMS is formatted as follows: * * 1. A smil/application part, which contains XML-like formatting for images, text, audio, * slideshows, videos, etc. * 2. One or more parts that correspond to one of the elements that was mentioned in the * formatting above. * * In the smil/application part, elements are identified by a "src" attribute in an XML-like * element. The challenge of this method lies in the fact that sometimes, the src string isn't * located at all in the part that it is meant to identify. * * We employ several methods of pairing src strings up to parts, using certain patterns we've * seen in failed MMS messages. These are described in this method. * TODO TODO TODO: Create a testing suite for this! */ private static PduPart findPart(final Context context, PduBody pb, String src, ArrayList<String> srcs) { PduPart result = null; if (src != null) { src = unescapeXML(src); // Sometimes, src takes the form of "cid:[NUMBER]". if (contentIdSrc(src)) { // Extract the content ID, and try finding the part using that. result = pb.getPartByContentId("<" + src.substring("cid:".length()) + ">"); if (result == null) { // Another thing that can happen is that there is a slideshow of images, each with // "cid:[NUMBER]" src, but the parts aren't labelled with the content ID. If // this is the case, then we just return the ith image part, where i is the position // of src if all the srcs are sorted in ascending order as content IDs. srcs may // include duplicates; we remove those and then identify i when the list is free from // duplicates. // // i.e., for srcs = [ "cid:755", "cid:755", "cid:756", "cid:757", "cid:758" ], // the i of "cid:755" is 0; for "cid:756" is 1, etc. // First check that all the src strings are content IDs. boolean allContentIDs = true; for (String _src : srcs) { if (!contentIdSrc(_src)) { allContentIDs = false; break; } } if (allContentIDs) { // Now, build a list of long IDs, sort them, and remove the duplicates. ArrayList<Long> cids = new ArrayList<>(); for (String _src : srcs) { cids.add(getContentId(_src)); } Collections.sort(cids); int removed = 0; long previous = -1; for (int i = 0; i < cids.size() - removed; i++) { long cid = cids.get(i); if (cid == previous) { cids.remove(i); removed++; } else { previous = cid; } } // Find the i such that getContentId(src) == cids[i] long cid = getContentId(src); int i = cids.indexOf(cid); // Finally, since the SMIL formatted part will come first, we expect to see // 1 + cids.size() parts, and the right part for this particular cid will be // 1 + i. if (1 + i < pb.getPartsNum()) { result = pb.getPart(i + 1); } } } } else if (textSrc(src)) { // This is just a text src, so look for the PduPart that is has the "text/plain" // content type. for (int i = 0; i < pb.getPartsNum(); i++) { PduPart part = pb.getPart(i); String contentType = byteArrayToString(part.getContentType()); if ("text/plain".equals(contentType)) { result = part; break; } } } // Try a few more things in case the previous processing didn't work correctly: // Search by name if (result == null) { result = pb.getPartByName(src); } // Search by filename if (result == null) { result = pb.getPartByFileName(src); } // Search by content location if (result == null) { result = pb.getPartByContentLocation(src); } // Try treating the src string as a content ID, and searching by content ID. if (result == null) { result = pb.getPartByContentId("<" + src + ">"); } // TODO: // four remaining cases currently in Firebase: // 1. src: "image:[NUMBER]" (broken formatting) // 2. src: "[NUMBER]" (broken formatting) // 3. src: "[name].vcf" (we don't support x-vcard) // 3. src: "Current Location.loc.vcf" (we don't support x-vcard) } if (result != null) { return result; } if (pb.getPartsNum() > 0) { final JSONArray array = new JSONArray(); for (int i = 0; i < pb.getPartsNum(); i++) { JSONObject object = new JSONObject(); try { object.put("part_number", i); } catch (Exception e) { e.printStackTrace(); } try { object.put("location", i); } catch (Exception e) { e.printStackTrace(); } try { object.put("charset", pb.getPart(i).getCharset()); } catch (Exception e) { e.printStackTrace(); } try { object.put("content_disposition", byteArrayToString(pb.getPart(i).getContentDisposition())); } catch (Exception e) { e.printStackTrace(); } try { object.put("content_id", byteArrayToString(pb.getPart(i).getContentId())); } catch (Exception e) { e.printStackTrace(); } try { object.put("content_location", byteArrayToString(pb.getPart(i).getContentLocation())); } catch (Exception e) { e.printStackTrace(); } try { object.put("content_transfer_encoding", byteArrayToString(pb.getPart(i).getContentTransferEncoding())); } catch (Exception e) { e.printStackTrace(); } try { object.put("content_type", byteArrayToString(pb.getPart(i).getContentType())); } catch (Exception e) { e.printStackTrace(); } try { object.put("data", byteArrayToString(pb.getPart(i).getData())); } catch (Exception e) { e.printStackTrace(); } try { object.put("data_uri", pb.getPart(i).getDataUri()); } catch (Exception e) { e.printStackTrace(); } try { object.put("file_name", byteArrayToString(pb.getPart(i).getFilename())); } catch (Exception e) { e.printStackTrace(); } try { object.put("name", byteArrayToString(pb.getPart(i).getName())); } catch (Exception e) { e.printStackTrace(); } if (pb.getPart(i).generateLocation() != null) { Log.d(TAG, "Location: " + pb.getPart(i).generateLocation()); if (pb.getPart(i).generateLocation().contains(src)) { return pb.getPart(i); } } array.put(object); } } throw new IllegalArgumentException("No part found for the model."); } private static boolean textSrc(String src) { return src != null && src.startsWith("text") && src.endsWith(".txt"); } private static boolean contentIdSrc(String src) { return src != null && src.startsWith("cid:"); } private static long getContentId(String src) { if (src == null) { return -1; } else { if (LOCAL_LOGV) { Log.v(TAG, "Initial contentId: " + src); } src = src.substring("cid:".length()); src = unescapeXML(src); // Strip any leading < or trailing > ... they are present sometimes and causing error(s) src = src.replaceAll("(^\\<)|(\\>$)", ""); if (LOCAL_LOGV) { Log.v(TAG, "Final contentId: " + src); } return Long.parseLong(src); } } private static String byteArrayToString(byte[] bytes) { if (bytes != null) { return new String(bytes); } return "null"; } private static boolean hasBeenPosted(Context context, JSONArray array) throws NoSuchAlgorithmException { MessageDigest messageDigest = MessageDigest.getInstance("SHA-256"); messageDigest.update(array.toString().getBytes()); String encryptedString = new String(messageDigest.digest()); return PreferenceManager.getDefaultSharedPreferences(context).getBoolean(encryptedString, false); } private static void savePostStatus(Context context, JSONArray array, boolean posted) throws NoSuchAlgorithmException { MessageDigest messageDigest = MessageDigest.getInstance("SHA-256"); messageDigest.update(array.toString().getBytes()); String encryptedString = new String(messageDigest.digest()); PreferenceManager.getDefaultSharedPreferences(context).edit().putBoolean(encryptedString, true); } private static String unescapeXML(String str) { return str.replaceAll("<", "<").replaceAll(">", ">").replaceAll(""", "\"") .replaceAll("'", "'").replaceAll("&", "&"); } private static MediaModel getRegionMediaModel(Context context, String tag, String src, SMILRegionMediaElement srme, LayoutModel layouts, PduPart part) throws IOException, MmsException { SMILRegionElement sre = srme.getRegion(); if (sre != null) { RegionModel region = layouts.findRegionById(sre.getId()); if (region != null) { return getGenericMediaModel(context, tag, src, srme, part, region); } } else { String rId; if (tag.equals(SmilHelper.ELEMENT_TAG_TEXT)) { rId = LayoutModel.TEXT_REGION_ID; } else { rId = LayoutModel.IMAGE_REGION_ID; } RegionModel region = layouts.findRegionById(rId); if (region != null) { return getGenericMediaModel(context, tag, src, srme, part, region); } } throw new IllegalArgumentException("Region not found or bad region ID."); } // When we encounter a content type we can't handle, such as "application/vnd.smaf", instead // of throwing an exception and crashing, insert an empty TextModel in its place. private static MediaModel createEmptyTextModel(Context context, RegionModel regionModel) throws IOException { return new TextModel(context, ContentType.TEXT_PLAIN, null, regionModel); } private static MediaModel getGenericMediaModel(Context context, String tag, String src, SMILMediaElement sme, PduPart part, RegionModel regionModel) throws IOException, MmsException { byte[] bytes = part.getContentType(); if (bytes == null) { throw new IllegalArgumentException("Content-Type of the part may not be null."); } String contentType = new String(bytes); MediaModel media; switch (tag) { case SmilHelper.ELEMENT_TAG_TEXT: media = new TextModel(context, contentType, src, part.getCharset(), part.getData(), regionModel); break; case SmilHelper.ELEMENT_TAG_IMAGE: media = new ImageModel(context, contentType, src, part.getDataUri(), regionModel); break; case SmilHelper.ELEMENT_TAG_VIDEO: media = new VideoModel(context, contentType, src, part.getDataUri(), regionModel); break; case SmilHelper.ELEMENT_TAG_AUDIO: media = new AudioModel(context, contentType, src, part.getDataUri()); break; case SmilHelper.ELEMENT_TAG_REF: if (ContentType.isTextType(contentType)) { media = new TextModel(context, contentType, src, part.getCharset(), part.getData(), regionModel); } else if (ContentType.isImageType(contentType)) { media = new ImageModel(context, contentType, src, part.getDataUri(), regionModel); } else if (ContentType.isVideoType(contentType)) { media = new VideoModel(context, contentType, src, part.getDataUri(), regionModel); } else if (ContentType.isAudioType(contentType)) { media = new AudioModel(context, contentType, src, part.getDataUri()); } else { Log.d(TAG, "[MediaModelFactory] getGenericMediaModel Unsupported Content-Type: " + contentType); media = createEmptyTextModel(context, regionModel); } break; default: throw new IllegalArgumentException("Unsupported TAG: " + tag); } // Set 'begin' property. int begin = 0; TimeList tl = sme.getBegin(); if ((tl != null) && (tl.getLength() > 0)) { // We only support a single begin value. Time t = tl.item(0); begin = (int) (t.getResolvedOffset() * 1000); } media.setBegin(begin); // Set 'duration' property. int duration = (int) (sme.getDur() * 1000); if (duration <= 0) { tl = sme.getEnd(); if ((tl != null) && (tl.getLength() > 0)) { // We only support a single end value. Time t = tl.item(0); if (t.getTimeType() != Time.SMIL_TIME_INDEFINITE) { duration = (int) (t.getResolvedOffset() * 1000) - begin; if (duration == 0 && (media instanceof AudioModel || media instanceof VideoModel)) { duration = MmsConfig.getMinimumSlideElementDuration(); if (Log.isLoggable(TAG, Log.VERBOSE)) { Log.v(TAG, "[MediaModelFactory] compute new duration for " + tag + ", duration=" + duration); } } } } } media.setDuration(duration); if (!MmsConfig.getSlideDurationEnabled()) { /** * Because The slide duration is not supported by mmsc, * the device has to set fill type as FILL_FREEZE. * If not, the media will disappear while rotating the screen * in the slide show play view. */ media.setFill(SMILMediaElement.FILL_FREEZE); } else { // Set 'fill' property. media.setFill(sme.getFill()); } return media; } }