1 | /*
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2 | * Copyright 2000-2002,2004-2005 The Apache Software Foundation
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | *
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16 | */
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17 |
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18 | package org.apache.tools.mail;
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19 |
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20 | import java.io.InputStream;
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21 | import java.io.IOException;
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22 | import java.io.BufferedReader;
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23 | import java.io.InputStreamReader;
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24 |
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25 | /**
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26 | * A wrapper around the raw input from the SMTP server that assembles
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27 | * multi line responses into a single String.
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28 | *
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29 | * <p>The same rules used here would apply to FTP and other Telnet
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30 | * based protocols as well.</p>
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31 | *
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32 | */
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33 | public class SmtpResponseReader {
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34 |
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35 | protected BufferedReader reader = null;
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36 | private StringBuffer result = new StringBuffer();
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37 |
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38 | /**
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39 | * Wrap this input stream.
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40 | * @param in the stream to wrap.
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41 | */
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42 | public SmtpResponseReader(InputStream in) {
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43 | reader = new BufferedReader(new InputStreamReader(in));
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44 | }
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45 |
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46 | /**
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47 | * Read until the server indicates that the response is complete.
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48 | *
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49 | * @return Responsecode (3 digits) + Blank + Text from all
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50 | * response line concatenated (with blanks replacing the \r\n
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51 | * sequences).
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52 | * @throws IOException on error.
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53 | */
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54 | public String getResponse() throws IOException {
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55 | result.setLength(0);
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56 | String line = reader.readLine();
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57 | if (line != null && line.length() >= 3) {
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58 | result.append(line.substring(0, 3));
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59 | result.append(" ");
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60 | }
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61 |
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62 | while (line != null) {
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63 | append(line);
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64 | if (!hasMoreLines(line)) {
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65 | break;
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66 | }
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67 | line = reader.readLine();
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68 | }
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69 | return result.toString().trim();
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70 | }
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71 |
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72 | /**
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73 | * Closes the underlying stream.
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74 | * @throws IOException on error.
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75 | */
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76 | public void close() throws IOException {
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77 | reader.close();
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78 | }
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79 |
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80 | /**
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81 | * Should we expect more input?
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82 | * @param line the line to check.
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83 | * @return true if there are more lines to check.
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84 | */
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85 | protected boolean hasMoreLines(String line) {
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86 | return line.length() > 3 && line.charAt(3) == '-';
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87 | }
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88 |
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89 | /**
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90 | * Append the text from this line of the resonse.
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91 | */
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92 | private void append(String line) {
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93 | if (line.length() > 4) {
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94 | result.append(line.substring(4));
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95 | result.append(" ");
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96 | }
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97 | }
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98 | }
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