Mercurial Hosting > luan
annotate core/src/luan/modules/Utils.java @ 203:99eef1d0e706
IO security
git-svn-id: https://luan-java.googlecode.com/svn/trunk@204 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Sun, 06 Jul 2014 03:54:08 +0000 |
parents | 1cb298d918b2 |
children | a1b142f9c5c0 |
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1 package luan.modules; |
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2 |
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3 import java.io.Reader; |
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4 import java.io.IOException; |
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5 import java.io.ByteArrayOutputStream; |
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6 import java.io.InputStream; |
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7 import java.io.OutputStream; |
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8 import java.io.File; |
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9 import java.net.URL; |
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10 import java.net.MalformedURLException; |
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11 import luan.LuanState; |
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12 import luan.LuanException; |
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13 |
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14 |
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15 public final class Utils { |
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16 private Utils() {} // never |
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17 |
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18 static final int bufSize = 8192; |
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19 |
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20 public static void checkNotNull(LuanState luan,Object v,String expected) throws LuanException { |
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21 if( v == null ) |
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22 throw luan.exception("bad argument #1 ("+expected+" expected, got nil)"); |
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23 } |
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24 |
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25 public static String readAll(Reader in) |
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26 throws IOException |
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27 { |
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28 char[] a = new char[bufSize]; |
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29 StringBuilder buf = new StringBuilder(); |
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30 int n; |
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31 while( (n=in.read(a)) != -1 ) { |
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32 buf.append(a,0,n); |
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33 } |
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34 return buf.toString(); |
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35 } |
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36 |
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37 public static void copyAll(InputStream in,OutputStream out) |
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38 throws IOException |
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39 { |
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40 byte[] a = new byte[bufSize]; |
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41 int n; |
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42 while( (n=in.read(a)) != -1 ) { |
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43 out.write(a,0,n); |
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44 } |
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45 } |
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46 |
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47 public static byte[] readAll(InputStream in) |
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48 throws IOException |
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49 { |
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50 ByteArrayOutputStream out = new ByteArrayOutputStream(); |
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51 copyAll(in,out); |
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52 return out.toByteArray(); |
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53 } |
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54 |
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55 public static boolean exists(File file) { |
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56 try { |
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57 return file.exists() && file.getName().equals(file.getCanonicalFile().getName()); |
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58 } catch(IOException e) { |
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59 throw new RuntimeException(e); |
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60 } |
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61 } |
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62 |
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63 public static File toFile(String path) { |
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64 if( path.contains("//") ) |
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65 return null; |
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66 File file = new File(path); |
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67 return exists(file) ? file : null; |
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68 } |
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69 |
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70 public static URL toUrl(String path) { |
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71 if( path.indexOf(':') == -1 ) |
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72 return null; |
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73 if( path.startsWith("java:") ) { |
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74 path = path.substring(5); |
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75 if( path.contains("//") ) |
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76 return null; |
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77 URL url = ClassLoader.getSystemResource(path); |
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78 return url==null ? null : url; |
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79 } |
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80 try { |
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81 return new URL(path); |
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82 } catch(MalformedURLException e) {} |
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83 return null; |
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84 } |
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85 |
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86 public static boolean exists(String path) { |
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87 return toFile(path)!=null || toUrl(path)!=null; |
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88 } |
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89 } |