Mercurial > cgi-bin > hgweb.cgi > ClipMan

annotate src/name/blackcap/clipman/RtfToHtml.kt @ 18:96cc73ae2904

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Make it more fail-safe.
author David Barts <n5jrn@me.com>
date Tue, 21 Jan 2020 16:39:02 -0800
parents be282c48010a
children 8aa2dfac27eb
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1 /*
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2 * Because Java (and by implication Kotlin) sucks at processing RTF data,
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3 * we deal with such data by invoking an external program to convert it
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4 * to HTML.
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5 */
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6 package name.blackcap.clipman
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7
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8 import java.io.BufferedInputStream
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9 import java.io.BufferedOutputStream
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10 import java.io.ByteArrayOutputStream
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11 import java.io.IOException
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12 import java.io.InputStream
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13 import java.io.OutputStream
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14 import java.io.UnsupportedEncodingException
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15
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16 private val RTF_CHARSET_NAME = "UTF-8"
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17 private val LANG = "en_US." + RTF_CHARSET_NAME
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18 private val UNRTF = System.getenv("UNRTF")
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19
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20 private class Consumer(val source: InputStream): Thread() {
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21 val target = ByteArrayOutputStream()
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22
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23 override fun run() {
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24 source.use { it.copyTo(target) }
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25 }
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26
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27 val output: String
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28 @Synchronized get() {
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29 if (isAlive()) {
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30 throw IllegalThreadStateException("consumer not finished!")
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31 } else {
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32 return target.toString(RTF_CHARSET_NAME)
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33 }
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34 }
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35 }
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36
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37 /**
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38 * Convert an InputStream of RTF bytes to a String containing an HTML
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39 * document.
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40 * @param rtfStream stream containing the RTF document
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41 * @return a Pair. On success, the first element contains the HTML and
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42 * the second is null. On failure, the first is null and the
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43 * second contains an error message.
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44 */
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45 public fun rtfToHtml(rtfStream: InputStream): Pair<String?, String?> {
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46 if (OS.type == OS.MAC && UNRTF == null) {
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47 return _rtfToHtml(rtfStream, ProcessBuilder("textutil", "-format",
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48 "rtf", "-convert", "html", "-stdin", "-stdout"))
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49 } else {
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50 return _rtfToHtml(rtfStream, ProcessBuilder(
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51 if (UNRTF == null) { "unrtf" } else { UNRTF },
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52 "--html", "--nopict"))
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53 }
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54 }
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55
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56 private fun _rtfToHtml(rtfStream: InputStream, pb: ProcessBuilder): Pair<String?, String?> {
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57 var job: Process? = null
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58 try {
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59 /* set the Posix locale to force UTF-8 I/O */
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60 pb.environment().run {
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61 put("LANG", LANG)
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62 put("LC_ALL", LANG)
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63 }
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64
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65 /* start the process */
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66 job = pb.start()
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67
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68 /* start consuming its output and error streams */
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69 val outputConsumer = Consumer(job.inputStream).apply { start() }
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70 val errorConsumer = Consumer(job.errorStream).apply { start() }
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71
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72 /* feed it input */
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73 job.outputStream.use { rtfStream.copyTo(it) }
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74
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75 /* wait for it to exit */
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76 val exitStatus = job.waitFor()
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77
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78 /* after it exits, wait for our data consumers to exit */
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79 outputConsumer.join();
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80 errorConsumer.join();
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81
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82 /* if it barfed, return an error, else return the HTML */
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83 if (exitStatus != 0) {
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84 val errors = errorConsumer.output
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85 if (errors.isEmpty()) {
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86 return Pair(null, "converter exited with status " + exitStatus)
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87 } else {
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88 return Pair(null, errors)
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89 }
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90 }
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91 return Pair(outputConsumer.output, null)
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92 } catch (e: IOException) {
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93 return barfed(e)
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94 } catch (e: InterruptedException) {
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95 if (job != null && job.isAlive()) {
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96 job.destroy()
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97 job.waitFor()
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98 }
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99 return barfed(e)
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100 }
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101 }
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102
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103 private fun barfed(e: Exception): Pair<String?, String?> {
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104 val sb = StringBuilder(e::class.simpleName)
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105 val message = e.message ?: ""
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106 if (!message.isEmpty()) {
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107 sb.append(": ")
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108 sb.append(e.message)
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109 }
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110 return Pair(null, sb.toString())
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111 }