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annotate src/luan/Luan.java @ 1330:f41919741100

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fix security
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 11 Feb 2019 01:38:55 -0700
parents 9fa8b8389578
children 25746915a241
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1 package luan;
2df768b926aa start Luan
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2
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3 import java.util.List;
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4 import java.util.ArrayList;
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5 import java.util.Map;
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6 import java.util.LinkedHashMap;
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7 import java.util.Set;
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8 import java.util.Arrays;
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9 import java.util.Iterator;
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ebe9db183eb7 rename *Lib.java to *Luan.java
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10 import luan.modules.BasicLuan;
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11 import luan.modules.Utils;
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12 import luan.impl.LuanCompiler;
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14
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15 public final class Luan {
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16
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17 public static void main(String[] args) throws LuanException {
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18 doFile( "classpath:luan/cmd_line.luan", args );
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19 }
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20
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21 public static void doFile(String uri,String... args) throws LuanException {
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22 LuanState luan = new LuanState();
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23 LuanFunction fn = (LuanFunction)BasicLuan.load_file(luan,uri);
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24 fn.call(luan,args);
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25 }
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26
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27 public static Object first(Object obj) {
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28 if( !(obj instanceof Object[]) )
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29 return obj;
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30 Object[] a = (Object[])obj;
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31 return a.length==0 ? null : a[0];
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32 }
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34 public static Object[] array(Object obj) {
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35 return obj instanceof Object[] ? (Object[])obj : new Object[]{obj};
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36 }
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38 public static String type(Object obj) {
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39 if( obj == null )
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40 return "nil";
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41 if( obj instanceof String )
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42 return "string";
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43 if( obj instanceof Boolean )
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44 return "boolean";
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45 if( obj instanceof Number )
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46 return "number";
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47 if( obj instanceof LuanTable )
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48 return "table";
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49 if( obj instanceof LuanFunction )
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50 return "function";
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51 if( obj instanceof byte[] )
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52 return "binary";
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53 return "java";
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54 }
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56 public static String toString(Number n) {
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57 if( n instanceof Integer )
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58 return n.toString();
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59 int i = n.intValue();
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60 if( i == n.doubleValue() )
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61 return Integer.toString(i);
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62 String s = n.toString();
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63 int iE = s.indexOf('E');
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64 String ending = null;
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65 if( iE != -1 ) {
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66 ending = s.substring(iE);
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67 s = s.substring(0,iE);
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68 }
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69 if( s.endsWith(".0") )
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70 s = s.substring(0,s.length()-2);
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71 if( ending != null )
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72 s += ending;
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73 return s;
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74 }
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76 public static Integer asInteger(Object obj) {
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77 if( obj instanceof Integer )
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78 return (Integer)obj;
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79 if( !(obj instanceof Number) )
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80 return null;
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81 Number n = (Number)obj;
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82 int i = n.intValue();
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83 return i==n.doubleValue() ? Integer.valueOf(i) : null;
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84 }
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86 public static String stringEncode(String s) {
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87 s = s.replace("\\","\\\\");
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88 s = s.replace("\u0007","\\a");
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89 s = s.replace("\b","\\b");
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90 s = s.replace("\f","\\f");
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91 s = s.replace("\n","\\n");
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92 s = s.replace("\r","\\r");
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93 s = s.replace("\t","\\t");
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94 s = s.replace("\u000b","\\v");
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95 s = s.replace("\"","\\\"");
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96 s = s.replace("\'","\\'");
88
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97 return s;
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98 }
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99
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100
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101 // from LuanState
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102
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103 public static Boolean checkBoolean(Object obj) throws LuanException {
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104 if( obj instanceof Boolean )
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105 return (Boolean)obj;
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106 throw new LuanException("attempt to use a " + Luan.type(obj) + " value as a boolean" );
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107 }
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108
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109 public static String checkString(Object obj) throws LuanException {
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110 if( obj instanceof String )
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111 return (String)obj;
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112 throw new LuanException("attempt to use a " + Luan.type(obj) + " value as a string" );
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113 }
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114
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115 public static LuanFunction checkFunction(Object obj) throws LuanException {
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116 if( obj instanceof LuanFunction )
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117 return (LuanFunction)obj;
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118 throw new LuanException("attempt to call a " + Luan.type(obj) + " value" );
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119 }
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120
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121 public static LuanFunction load(String text,String sourceName,LuanTable env)
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122 throws LuanException
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123 {
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124 return LuanCompiler.compile(text,sourceName,env);
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125 }
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126
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127 public static LuanFunction load(String text,String sourceName)
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128 throws LuanException
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129 {
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130 return load(text,sourceName,null);
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131 }
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132
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133 /*
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134 public static Object toLuan(Object obj) throws LuanException {
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135 if( !type(obj).equals("java") )
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136 return obj;
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137 LuanTable tbl = new LuanTable();
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138 if( obj instanceof Map ) {
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139 Map map = (Map)obj;
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140 for( Object stupid : map.entrySet() ) {
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141 Map.Entry entry = (Map.Entry)stupid;
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142 Object key = entry.getKey();
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143 Object value = entry.getValue();
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144 if( key != null && value != null )
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145 tbl.rawPut(toLuan(key),toLuan(value));
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146 }
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147 return tbl;
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148 }
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149 if( obj instanceof Set ) {
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150 Set set = (Set)obj;
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151 for( Object el : set ) {
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152 if( el != null )
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153 tbl.rawPut(toLuan(el),Boolean.TRUE);
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154 }
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155 return tbl;
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156 }
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157 List list;
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158 if( obj instanceof List ) {
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159 list = (List)obj;
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160 } else {
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161 Class cls = obj.getClass();
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162 if( cls.isArray() && !cls.getComponentType().isPrimitive() ) {
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163 Object[] a = (Object[])obj;
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164 list = Arrays.asList(a);
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165 } else
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166 throw new LuanException("can't convert type "+obj.getClass().getName()+" to luan");
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167 }
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168 int n = list.size();
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169 for( int i=0; i<n; i++ ) {
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170 Object val = list.get(i);
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171 if( val != null )
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172 tbl.rawPut(i+1,toLuan(val));
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173 }
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174 return tbl;
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175 }
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176 */
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177
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178 public static Object toJava(Object obj) throws LuanException {
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179 if( !(obj instanceof LuanTable) )
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180 return obj;
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181 LuanTable tbl = (LuanTable)obj;
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182 if( tbl.isList() ) {
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183 List list = new ArrayList();
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184 for( Object el : tbl.asList() ) {
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185 list.add( toJava(el) );
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186 }
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187 return list;
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188 } else {
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189 Map map = new LinkedHashMap();
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190 Iterator<Map.Entry> iter = tbl.rawIterator();
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191 while( iter.hasNext() ) {
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192 Map.Entry entry = iter.next();
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193 map.put( toJava(entry.getKey()), toJava(entry.getValue()) );
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194 }
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195 return map;
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196 }
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197 }
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198 /*
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199 public static LuanTable table(LuanTable v) throws LuanException {
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200 Utils.checkNotNull(v);
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201 return v;
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202 }
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203 */
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204
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205
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206
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207 // security
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208
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209 public interface Security {
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210 public void check(LuanState luan,LuanClosure closure,String op,Object... args) throws LuanException;
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211 }
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212
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213 private static String SECURITY_KEY = "Luan.Security";
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214
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215 public static void checkSecurity(LuanState luan,String op,Object... args) throws LuanException {
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216 check(luan,1,op,args);
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217 }
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218
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219 public static void checkCallerSecurity(LuanState luan,String op,Object... args) throws LuanException {
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220 check(luan,2,op,args);
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221 }
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222
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223 private static void check(LuanState luan,int i,String op,Object... args) throws LuanException {
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224 Security s = (Security)luan.registry().get(SECURITY_KEY);
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225 if( s!=null )
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226 s.check(luan,luan.peek(),op,args);
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227 }
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228
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229 public static Security setSecurity(LuanState luan,Security s) {
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230 return (Security)luan.registry().put(SECURITY_KEY,s);
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231 }
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232
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233
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234 private Luan() {} // never
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235 }