Allow emoji input in subjects.
Signed-off-by: HIRANO Takahito <hiranotaka@zng.info>
This commit is contained in:
HIRANO Takahito
parent
2ec5a712a2
commit
580d19ec17
4 changed files with 199 additions and 5 deletions
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@ -362,6 +362,7 @@ public class MessageCompose extends K9Activity implements OnClickListener, OnFoc
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mCcView = (MultiAutoCompleteTextView)findViewById(R.id.cc);
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mBccView = (MultiAutoCompleteTextView)findViewById(R.id.bcc);
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mSubjectView = (EditText)findViewById(R.id.subject);
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mSubjectView.getInputExtras(true).putBoolean("allowEmoji", true);
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EditText upperSignature = (EditText)findViewById(R.id.upper_signature);
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EditText lowerSignature = (EditText)findViewById(R.id.lower_signature);
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189
src/com/fsck/k9/mail/internet/EncoderUtil.java
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189
src/com/fsck/k9/mail/internet/EncoderUtil.java
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@ -0,0 +1,189 @@
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package com.fsck.k9.mail.internet;
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import java.nio.ByteBuffer;
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import java.nio.charset.Charset;
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import java.util.BitSet;
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import java.util.Locale;
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import org.apache.james.mime4j.util.CharsetUtil;
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/**
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* Static methods for encoding header field values. This includes encoded-words
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* as defined in <a href='http://www.faqs.org/rfcs/rfc2047.html'>RFC 2047</a>
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* or display-names of an e-mail address, for example.
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*
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* This class is copied from the org.apache.james.mime4j.decoder.EncoderUtil class. It's modified here in order to
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* encode emoji characters in the Subject headers. The method to decode emoji depends on the MimeMessage class because
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* it has to be determined with the sender address.
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*/
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public class EncoderUtil {
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private static final BitSet Q_RESTRICTED_CHARS = initChars("=_?\"#$%&'(),.:;<>@[\\]^`{|}~");
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private static final int MAX_USED_CHARACTERS = 50;
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private static final String ENC_WORD_PREFIX = "=?";
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private static final String ENC_WORD_SUFFIX = "?=";
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private static final int ENCODED_WORD_MAX_LENGTH = 75; // RFC 2047
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private static BitSet initChars(String specials) {
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BitSet bs = new BitSet(128);
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for (char ch = 33; ch < 127; ch++) {
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if (specials.indexOf(ch) == -1) {
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bs.set(ch);
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}
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}
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return bs;
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}
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/**
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* Selects one of the two encodings specified in RFC 2047.
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*/
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public enum Encoding {
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/** The B encoding (identical to base64 defined in RFC 2045). */
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B,
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/** The Q encoding (similar to quoted-printable defined in RFC 2045). */
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Q
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}
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private EncoderUtil() {
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}
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/**
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* Encodes the specified text into an encoded word or a sequence of encoded
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* words separated by space. The text is separated into a sequence of
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* encoded words if it does not fit in a single one.
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*
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* @param text
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* text to encode.
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* @param charset
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* the Java charset that should be used to encode the specified
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* string into a byte array. A suitable charset is detected
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* automatically if this parameter is <code>null</code>.
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* @return the encoded word (or sequence of encoded words if the given text
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* does not fit in a single encoded word).
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*/
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public static String encodeEncodedWord(String text, Charset charset) {
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if (text == null)
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throw new IllegalArgumentException();
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if (charset == null)
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charset = determineCharset(text);
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String mimeCharset = MimeUtility.getExternalCharset(charset.name());
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byte[] bytes = encode(text, charset);
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Encoding encoding = determineEncoding(bytes);
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if (encoding == Encoding.B) {
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String prefix = ENC_WORD_PREFIX + mimeCharset + "?B?";
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return encodeB(prefix, text, charset, bytes);
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} else {
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String prefix = ENC_WORD_PREFIX + mimeCharset + "?Q?";
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return encodeQ(prefix, text, charset, bytes);
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}
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}
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private static String encodeB(String prefix, String text, Charset charset, byte[] bytes) {
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int encodedLength = bEncodedLength(bytes);
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int totalLength = prefix.length() + encodedLength
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+ ENC_WORD_SUFFIX.length();
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if (totalLength <= ENCODED_WORD_MAX_LENGTH) {
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return prefix + org.apache.james.mime4j.codec.EncoderUtil.encodeB(bytes) + ENC_WORD_SUFFIX;
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} else {
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String part1 = text.substring(0, text.length() / 2);
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byte[] bytes1 = encode(part1, charset);
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String word1 = encodeB(prefix, part1, charset, bytes1);
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String part2 = text.substring(text.length() / 2);
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byte[] bytes2 = encode(part2, charset);
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String word2 = encodeB(prefix, part2, charset, bytes2);
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return word1 + " " + word2;
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}
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}
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private static int bEncodedLength(byte[] bytes) {
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return (bytes.length + 2) / 3 * 4;
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}
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private static String encodeQ(String prefix, String text, Charset charset, byte[] bytes) {
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int encodedLength = qEncodedLength(bytes);
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int totalLength = prefix.length() + encodedLength
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+ ENC_WORD_SUFFIX.length();
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if (totalLength <= ENCODED_WORD_MAX_LENGTH) {
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return prefix + org.apache.james.mime4j.codec.EncoderUtil.encodeQ(bytes, org.apache.james.mime4j.codec.EncoderUtil.Usage.WORD_ENTITY) + ENC_WORD_SUFFIX;
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} else {
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String part1 = text.substring(0, text.length() / 2);
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byte[] bytes1 = encode(part1, charset);
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String word1 = encodeQ(prefix, part1, charset, bytes1);
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String part2 = text.substring(text.length() / 2);
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byte[] bytes2 = encode(part2, charset);
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String word2 = encodeQ(prefix, part2, charset, bytes2);
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return word1 + " " + word2;
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}
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}
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private static int qEncodedLength(byte[] bytes) {
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int count = 0;
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for (int idx = 0; idx < bytes.length; idx++) {
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int v = bytes[idx] & 0xff;
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if (v == 32) {
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count++;
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} else if (!Q_RESTRICTED_CHARS.get(v)) {
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count += 3;
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} else {
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count++;
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}
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}
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return count;
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}
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private static byte[] encode(String text, Charset charset) {
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ByteBuffer buffer = charset.encode(text);
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byte[] bytes = new byte[buffer.limit()];
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buffer.get(bytes);
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return bytes;
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}
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private static Charset determineCharset(String text) {
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// it is an important property of iso-8859-1 that it directly maps
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// unicode code points 0000 to 00ff to byte values 00 to ff.
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boolean ascii = true;
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final int len = text.length();
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for (int index = 0; index < len; index++) {
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char ch = text.charAt(index);
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if (ch > 0xff) {
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return CharsetUtil.UTF_8;
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}
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if (ch > 0x7f) {
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ascii = false;
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}
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}
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return ascii ? CharsetUtil.US_ASCII : CharsetUtil.ISO_8859_1;
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}
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private static Encoding determineEncoding(byte[] bytes) {
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if (bytes.length == 0)
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return Encoding.Q;
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int qEncoded = 0;
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for (int i = 0; i < bytes.length; i++) {
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int v = bytes[i] & 0xff;
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if (v != 32 && !Q_RESTRICTED_CHARS.get(v)) {
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qEncoded++;
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}
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}
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int percentage = qEncoded * 100 / bytes.length;
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return percentage > 30 ? Encoding.B : Encoding.Q;
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}
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}
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@ -2,12 +2,12 @@
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package com.fsck.k9.mail.internet;
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import com.fsck.k9.helper.Utility;
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import org.apache.james.mime4j.codec.EncoderUtil;
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import java.io.BufferedWriter;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.io.OutputStreamWriter;
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import java.nio.charset.Charset;
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import java.util.*;
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public class MimeHeader {
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@ -37,6 +37,7 @@ public class MimeHeader {
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};
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protected ArrayList<Field> mFields = new ArrayList<Field>();
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private String mCharset = null;
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public void clear() {
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mFields.clear();
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@ -100,10 +101,7 @@ public class MimeHeader {
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String v = field.value;
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if (hasToBeEncoded(v)) {
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v = EncoderUtil.encodeEncodedWord(
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field.value,
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EncoderUtil.Usage.WORD_ENTITY
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);
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v = EncoderUtil.encodeEncodedWord(field.value, Charset.forName(mCharset));
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}
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writer.write(field.name + ": " + v + "\r\n");
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@ -143,4 +141,9 @@ public class MimeHeader {
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return sb.toString();
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}
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}
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public void setCharset(String charset)
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{
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mCharset = charset;
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}
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}
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@ -420,6 +420,7 @@ public class MimeMessage extends Message {
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@Override
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public void setCharset(String charset) throws MessagingException {
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mHeader.setCharset(charset);
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if (mBody instanceof Multipart) {
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((Multipart)mBody).setCharset(charset);
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} else if (mBody instanceof TextBody) {
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