123 lines
4.9 KiB
Java
Executable File
123 lines
4.9 KiB
Java
Executable File
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.email.mail.internet;
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import com.android.email.mail.MessagingException;
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import com.android.email.mail.Multipart;
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import com.android.email.mail.Part;
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import com.android.email.mail.store.LocalStore.LocalAttachmentBodyPart;
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import com.android.email.provider.AttachmentProvider;
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import com.android.email.provider.EmailContent;
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import android.content.ContentResolver;
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import android.net.Uri;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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public class EmailHtmlUtil {
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// Regex that matches characters that have special meaning in HTML. '<', '>', '&' and
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// multiple continuous spaces.
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private static final Pattern PLAIN_TEXT_TO_ESCAPE = Pattern.compile("[<>&]| {2,}|\r?\n");
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//TODO: make resolveInlineImage() work in the new content provider model.
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/**
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* Resolve content-id reference in src attribute of img tag to AttachmentProvider's
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* content uri. This method calls itself recursively at most the number of
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* LocalAttachmentPart that mime type is image and has content id.
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* The attribute src="cid:content_id" is resolved as src="content://...".
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* This method is package scope for testing purpose.
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*
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* @param text html email text
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* @param part mime part which may contain inline image
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* @return html text in which src attribute of img tag may be replaced with content uri
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*/
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public static String resolveInlineImage(
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ContentResolver resolver, long accountId, String text, Part part, int depth)
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throws MessagingException {
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// avoid too deep recursive call.
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if (depth >= 10 || text == null) {
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return text;
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}
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String contentType = MimeUtility.unfoldAndDecode(part.getContentType());
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String contentId = part.getContentId();
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if (contentType.startsWith("image/") &&
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contentId != null &&
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part instanceof LocalAttachmentBodyPart) {
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LocalAttachmentBodyPart attachment = (LocalAttachmentBodyPart)part;
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Uri attachmentUri =
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AttachmentProvider.getAttachmentUri(accountId, attachment.getAttachmentId());
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Uri contentUri =
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AttachmentProvider.resolveAttachmentIdToContentUri(resolver, attachmentUri);
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// Regexp which matches ' src="cid:contentId"'.
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String contentIdRe = "\\s+(?i)src=\"cid(?-i):\\Q" + contentId + "\\E\"";
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// Replace all occurrences of src attribute with ' src="content://contentUri"'.
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text = text.replaceAll(contentIdRe, " src=\"" + contentUri + "\"");
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}
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if (part.getBody() instanceof Multipart) {
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Multipart mp = (Multipart)part.getBody();
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for (int i = 0; i < mp.getCount(); i++) {
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text = resolveInlineImage(resolver, accountId, text, mp.getBodyPart(i), depth + 1);
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}
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}
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return text;
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}
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/**
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* Escape some special character as HTML escape sequence.
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*
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* @param text Text to be displayed using WebView.
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* @return Text correctly escaped.
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*/
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public static String escapeCharacterToDisplay(String text) {
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Pattern pattern = PLAIN_TEXT_TO_ESCAPE;
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Matcher match = pattern.matcher(text);
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if (match.find()) {
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StringBuilder out = new StringBuilder();
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int end = 0;
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do {
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int start = match.start();
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out.append(text.substring(end, start));
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end = match.end();
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int c = text.codePointAt(start);
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if (c == ' ') {
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// Escape successive spaces into series of " ".
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for (int i = 1, n = end - start; i < n; ++i) {
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out.append(" ");
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}
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out.append(' ');
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} else if (c == '\r' || c == '\n') {
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out.append("<br>");
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} else if (c == '<') {
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out.append("<");
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} else if (c == '>') {
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out.append(">");
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} else if (c == '&') {
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out.append("&");
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}
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} while (match.find());
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out.append(text.substring(end));
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text = out.toString();
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}
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return text;
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}
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}
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