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1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 /* |
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27 * @(#)InternetHeaders.java 1.16 02/08/08 |
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28 */ |
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29 |
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30 |
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31 |
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32 package com.sun.xml.internal.messaging.saaj.packaging.mime.internet; |
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33 |
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34 import com.sun.xml.internal.messaging.saaj.packaging.mime.Header; |
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35 import com.sun.xml.internal.messaging.saaj.packaging.mime.MessagingException; |
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36 import com.sun.xml.internal.messaging.saaj.packaging.mime.util.LineInputStream; |
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37 import com.sun.xml.internal.messaging.saaj.util.FinalArrayList; |
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38 |
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39 import java.io.IOException; |
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40 import java.io.InputStream; |
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41 import java.util.AbstractList; |
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42 import java.util.List; |
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43 import java.util.NoSuchElementException; |
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44 |
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45 /** |
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46 * InternetHeaders is a utility class that manages RFC822 style |
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47 * headers. Given an RFC822 format message stream, it reads lines |
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48 * until the blank line that indicates end of header. The input stream |
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49 * is positioned at the start of the body. The lines are stored |
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50 * within the object and can be extracted as either Strings or |
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51 * {@link Header} objects. <p> |
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52 * <p/> |
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53 * This class is mostly intended for service providers. MimeMessage |
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54 * and MimeBody use this class for holding their headers. <p> |
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55 * <p/> |
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56 * <hr> <strong>A note on RFC822 and MIME headers</strong><p> |
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57 * <p/> |
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58 * RFC822 and MIME header fields <strong>must</strong> contain only |
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59 * US-ASCII characters. If a header contains non US-ASCII characters, |
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60 * it must be encoded as per the rules in RFC 2047. The MimeUtility |
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61 * class provided in this package can be used to to achieve this. |
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62 * Callers of the <code>setHeader</code>, <code>addHeader</code>, and |
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63 * <code>addHeaderLine</code> methods are responsible for enforcing |
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64 * the MIME requirements for the specified headers. In addition, these |
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65 * header fields must be folded (wrapped) before being sent if they |
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66 * exceed the line length limitation for the transport (1000 bytes for |
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67 * SMTP). Received headers may have been folded. The application is |
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68 * responsible for folding and unfolding headers as appropriate. <p> |
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69 * |
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70 * @author John Mani |
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71 * @author Bill Shannon |
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72 * @see MimeUtility |
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73 */ |
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74 public final class InternetHeaders { |
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75 |
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76 private final FinalArrayList headers = new FinalArrayList(); |
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77 |
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78 /** |
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79 * Lazily cerated view of header lines (Strings). |
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80 */ |
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81 private List headerValueView; |
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82 |
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83 /** |
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84 * Create an empty InternetHeaders object. |
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85 */ |
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86 public InternetHeaders() { |
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87 } |
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88 |
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89 /** |
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90 * Read and parse the given RFC822 message stream till the |
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91 * blank line separating the header from the body. The input |
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92 * stream is left positioned at the start of the body. The |
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93 * header lines are stored internally. <p> |
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94 * <p/> |
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95 * For efficiency, wrap a BufferedInputStream around the actual |
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96 * input stream and pass it as the parameter. |
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97 * |
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98 * @param is RFC822 input stream |
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99 */ |
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100 public InternetHeaders(InputStream is) throws MessagingException { |
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101 load(is); |
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102 } |
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103 |
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104 /** |
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105 * Read and parse the given RFC822 message stream till the |
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106 * blank line separating the header from the body. Store the |
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107 * header lines inside this InternetHeaders object. <p> |
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108 * <p/> |
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109 * Note that the header lines are added into this InternetHeaders |
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110 * object, so any existing headers in this object will not be |
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111 * affected. |
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112 * |
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113 * @param is RFC822 input stream |
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114 */ |
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115 public void load(InputStream is) throws MessagingException { |
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116 // Read header lines until a blank line. It is valid |
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117 // to have BodyParts with no header lines. |
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118 String line; |
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119 LineInputStream lis = new LineInputStream(is); |
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120 String prevline = null; // the previous header line, as a string |
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121 // a buffer to accumulate the header in, when we know it's needed |
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122 StringBuffer lineBuffer = new StringBuffer(); |
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123 |
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124 try { |
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125 //while ((line = lis.readLine()) != null) { |
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126 do { |
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127 line = lis.readLine(); |
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128 if (line != null && |
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129 (line.startsWith(" ") || line.startsWith("\t"))) { |
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130 // continuation of header |
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131 if (prevline != null) { |
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132 lineBuffer.append(prevline); |
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133 prevline = null; |
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134 } |
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135 lineBuffer.append("\r\n"); |
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136 lineBuffer.append(line); |
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137 } else { |
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138 // new header |
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139 if (prevline != null) |
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140 addHeaderLine(prevline); |
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141 else if (lineBuffer.length() > 0) { |
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142 // store previous header first |
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143 addHeaderLine(lineBuffer.toString()); |
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144 lineBuffer.setLength(0); |
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145 } |
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146 prevline = line; |
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147 } |
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148 } while (line != null && line.length() > 0); |
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149 } catch (IOException ioex) { |
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150 throw new MessagingException("Error in input stream", ioex); |
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151 } |
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152 } |
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153 |
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154 /** |
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155 * Return all the values for the specified header. The |
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156 * values are String objects. Returns <code>null</code> |
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157 * if no headers with the specified name exist. |
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158 * |
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159 * @param name header name |
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160 * @return array of header values, or null if none |
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161 */ |
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162 public String[] getHeader(String name) { |
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163 // XXX - should we just step through in index order? |
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164 FinalArrayList v = new FinalArrayList(); // accumulate return values |
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165 |
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166 int len = headers.size(); |
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167 for( int i=0; i<len; i++ ) { |
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168 hdr h = (hdr) headers.get(i); |
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169 if (name.equalsIgnoreCase(h.name)) { |
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170 v.add(h.getValue()); |
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171 } |
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172 } |
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173 if (v.size() == 0) |
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174 return (null); |
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175 // convert Vector to an array for return |
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176 return (String[]) v.toArray(new String[v.size()]); |
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177 } |
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178 |
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179 /** |
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180 * Get all the headers for this header name, returned as a single |
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181 * String, with headers separated by the delimiter. If the |
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182 * delimiter is <code>null</code>, only the first header is |
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183 * returned. Returns <code>null</code> |
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184 * if no headers with the specified name exist. |
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185 * |
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186 * @param delimiter delimiter |
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187 * @return the value fields for all headers with |
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188 * this name, or null if none |
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189 * @param name header name |
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190 */ |
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191 public String getHeader(String name, String delimiter) { |
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192 String[] s = getHeader(name); |
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193 |
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194 if (s == null) |
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195 return null; |
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196 |
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197 if ((s.length == 1) || delimiter == null) |
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198 return s[0]; |
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199 |
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200 StringBuffer r = new StringBuffer(s[0]); |
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201 for (int i = 1; i < s.length; i++) { |
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202 r.append(delimiter); |
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203 r.append(s[i]); |
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204 } |
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205 return r.toString(); |
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206 } |
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207 |
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208 /** |
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209 * Change the first header line that matches name |
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210 * to have value, adding a new header if no existing header |
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211 * matches. Remove all matching headers but the first. <p> |
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212 * <p/> |
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213 * Note that RFC822 headers can only contain US-ASCII characters |
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214 * |
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215 * @param name header name |
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216 * @param value header value |
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217 */ |
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218 public void setHeader(String name, String value) { |
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219 boolean found = false; |
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220 |
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221 for (int i = 0; i < headers.size(); i++) { |
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222 hdr h = (hdr) headers.get(i); |
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223 if (name.equalsIgnoreCase(h.name)) { |
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224 if (!found) { |
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225 int j; |
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226 if (h.line != null && (j = h.line.indexOf(':')) >= 0) { |
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227 h.line = h.line.substring(0, j + 1) + " " + value; |
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228 } else { |
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229 h.line = name + ": " + value; |
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230 } |
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231 found = true; |
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232 } else { |
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233 headers.remove(i); |
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234 i--; // have to look at i again |
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235 } |
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236 } |
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237 } |
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238 |
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239 if (!found) { |
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240 addHeader(name, value); |
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241 } |
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242 } |
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243 |
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244 /** |
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245 * Add a header with the specified name and value to the header list. <p> |
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246 * <p/> |
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247 * Note that RFC822 headers can only contain US-ASCII characters. |
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248 * |
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249 * @param name header name |
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250 * @param value header value |
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251 */ |
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252 public void addHeader(String name, String value) { |
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253 int pos = headers.size(); |
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254 for (int i = headers.size() - 1; i >= 0; i--) { |
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255 hdr h = (hdr) headers.get(i); |
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256 if (name.equalsIgnoreCase(h.name)) { |
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257 headers.add(i + 1, new hdr(name, value)); |
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258 return; |
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259 } |
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260 // marker for default place to add new headers |
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261 if (h.name.equals(":")) |
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262 pos = i; |
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263 } |
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264 headers.add(pos, new hdr(name, value)); |
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265 } |
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266 |
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267 /** |
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268 * Remove all header entries that match the given name |
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269 * |
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270 * @param name header name |
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271 */ |
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272 public void removeHeader(String name) { |
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273 for (int i = 0; i < headers.size(); i++) { |
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274 hdr h = (hdr) headers.get(i); |
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275 if (name.equalsIgnoreCase(h.name)) { |
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276 headers.remove(i); |
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277 i--; // have to look at i again |
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278 } |
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279 } |
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280 } |
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281 |
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282 /** |
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283 * Return all the headers as an Enumeration of |
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284 * {@link Header} objects. |
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285 * |
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286 * @return Header objects |
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287 */ |
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288 public FinalArrayList getAllHeaders() { |
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289 return headers; // conceptually it should be read-only, but for performance reason I'm not wrapping it here |
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290 } |
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291 |
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292 /** |
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293 * Add an RFC822 header line to the header store. |
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294 * If the line starts with a space or tab (a continuation line), |
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295 * add it to the last header line in the list. <p> |
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296 * <p/> |
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297 * Note that RFC822 headers can only contain US-ASCII characters |
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298 * |
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299 * @param line raw RFC822 header line |
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300 */ |
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301 public void addHeaderLine(String line) { |
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302 try { |
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303 char c = line.charAt(0); |
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304 if (c == ' ' || c == '\t') { |
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305 hdr h = (hdr) headers.get(headers.size() - 1); |
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306 h.line += "\r\n" + line; |
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307 } else |
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308 headers.add(new hdr(line)); |
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309 } catch (StringIndexOutOfBoundsException e) { |
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310 // line is empty, ignore it |
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311 return; |
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312 } catch (NoSuchElementException e) { |
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313 // XXX - vector is empty? |
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314 } |
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315 } |
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316 |
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317 /** |
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318 * Return all the header lines as a collection |
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319 */ |
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320 public List getAllHeaderLines() { |
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321 if(headerValueView==null) |
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322 headerValueView = new AbstractList() { |
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323 public Object get(int index) { |
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324 return ((hdr)headers.get(index)).line; |
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325 } |
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326 |
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327 public int size() { |
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328 return headers.size(); |
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329 } |
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330 }; |
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331 return headerValueView; |
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332 } |
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333 } |
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334 |
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335 /* |
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336 * A private utility class to represent an individual header. |
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337 */ |
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338 |
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339 class hdr implements Header { |
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340 // XXX - should these be private? |
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341 String name; // the canonicalized (trimmed) name of this header |
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342 // XXX - should name be stored in lower case? |
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343 String line; // the entire RFC822 header "line" |
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344 |
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345 /* |
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346 * Constructor that takes a line and splits out |
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347 * the header name. |
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348 */ |
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349 hdr(String l) { |
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350 int i = l.indexOf(':'); |
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351 if (i < 0) { |
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352 // should never happen |
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353 name = l.trim(); |
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354 } else { |
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355 name = l.substring(0, i).trim(); |
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356 } |
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357 line = l; |
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358 } |
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359 |
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360 /* |
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361 * Constructor that takes a header name and value. |
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362 */ |
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363 hdr(String n, String v) { |
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364 name = n; |
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365 line = n + ": " + v; |
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366 } |
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367 |
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368 /* |
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369 * Return the "name" part of the header line. |
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370 */ |
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371 public String getName() { |
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372 return name; |
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373 } |
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374 |
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375 /* |
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376 * Return the "value" part of the header line. |
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377 */ |
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378 public String getValue() { |
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379 int i = line.indexOf(':'); |
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380 if (i < 0) |
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381 return line; |
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382 |
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383 int j; |
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384 if (name.equalsIgnoreCase("Content-Description")) { |
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385 // Content-Description should retain the folded whitespace after header unfolding - |
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386 // rf. RFC2822 section 2.2.3, rf. RFC2822 section 3.2.3 |
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387 for (j = i + 1; j < line.length(); j++) { |
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388 char c = line.charAt(j); |
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389 if (!(/*c == ' ' ||*/c == '\t' || c == '\r' || c == '\n')) |
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390 break; |
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391 } |
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392 } else { |
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393 // skip whitespace after ':' |
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394 for (j = i + 1; j < line.length(); j++) { |
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395 char c = line.charAt(j); |
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396 if (!(c == ' ' || c == '\t' || c == '\r' || c == '\n')) |
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397 break; |
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398 } |
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399 } |
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400 return line.substring(j); |
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401 } |
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402 } |