1 | /** |
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2 | * Base class for Annotator resource classes. |
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3 | */ |
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4 | package de.mpiwg.itgroup.annotations.restlet; |
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5 | |
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6 | import java.io.UnsupportedEncodingException; |
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7 | import java.net.URLDecoder; |
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8 | import java.net.URLEncoder; |
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9 | import java.security.InvalidKeyException; |
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10 | import java.security.SignatureException; |
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11 | import java.util.ArrayList; |
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12 | import java.util.List; |
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13 | import java.util.regex.Matcher; |
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14 | import java.util.regex.Pattern; |
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15 | |
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16 | import net.oauth.jsontoken.Checker; |
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17 | import net.oauth.jsontoken.JsonToken; |
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18 | import net.oauth.jsontoken.JsonTokenParser; |
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19 | import net.oauth.jsontoken.SystemClock; |
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20 | import net.oauth.jsontoken.crypto.HmacSHA256Verifier; |
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21 | import net.oauth.jsontoken.crypto.Verifier; |
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22 | |
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23 | import org.apache.commons.codec.binary.Base64; |
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24 | import org.apache.log4j.Logger; |
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25 | import org.json.JSONArray; |
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26 | import org.json.JSONException; |
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27 | import org.json.JSONObject; |
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28 | import org.restlet.data.ClientInfo; |
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29 | import org.restlet.data.Form; |
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30 | import org.restlet.data.Status; |
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31 | import org.restlet.representation.Representation; |
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32 | import org.restlet.resource.Options; |
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33 | import org.restlet.resource.ServerResource; |
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34 | import org.restlet.security.User; |
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35 | |
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36 | import de.mpiwg.itgroup.annotationManager.Constants.NS; |
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37 | import de.mpiwg.itgroup.annotationManager.RDFHandling.Annotation; |
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38 | |
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39 | /** |
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40 | * Base class for Annotator resource classes. |
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41 | * |
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42 | * @author dwinter, casties |
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43 | * |
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44 | */ |
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45 | public abstract class AnnotatorResourceImpl extends ServerResource { |
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46 | |
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47 | protected Logger logger = Logger.getRootLogger(); |
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48 | |
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49 | protected String getAllowedMethodsForHeader() { |
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50 | return "OPTIONS,GET,POST"; |
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51 | } |
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52 | |
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53 | public String encodeJsonId(String id) { |
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54 | try { |
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55 | return Base64.encodeBase64URLSafeString(id.getBytes("UTF-8")); |
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56 | } catch (UnsupportedEncodingException e) { |
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57 | return null; |
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58 | } |
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59 | } |
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60 | |
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61 | public String decodeJsonId(String id) { |
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62 | try { |
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63 | return new String(Base64.decodeBase64(id), "UTF-8"); |
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64 | } catch (UnsupportedEncodingException e) { |
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65 | return null; |
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66 | } |
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67 | } |
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68 | |
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69 | /** |
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70 | * Handle options request to allow CORS for AJAX. |
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71 | * |
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72 | * @param entity |
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73 | */ |
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74 | @Options |
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75 | public void doOptions(Representation entity) { |
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76 | logger.debug("AnnotatorResourceImpl doOptions!"); |
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77 | setCorsHeaders(); |
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78 | } |
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79 | |
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80 | /** |
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81 | * set headers to allow CORS for AJAX. |
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82 | */ |
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83 | protected void setCorsHeaders() { |
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84 | Form responseHeaders = (Form) getResponse().getAttributes().get("org.restlet.http.headers"); |
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85 | if (responseHeaders == null) { |
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86 | responseHeaders = new Form(); |
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87 | getResponse().getAttributes().put("org.restlet.http.headers", responseHeaders); |
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88 | } |
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89 | responseHeaders.add("Access-Control-Allow-Methods", getAllowedMethodsForHeader()); |
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90 | // echo back Origin and Request-Headers |
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91 | Form requestHeaders = (Form) getRequest().getAttributes().get("org.restlet.http.headers"); |
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92 | String origin = requestHeaders.getFirstValue("Origin", true); |
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93 | if (origin == null) { |
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94 | responseHeaders.add("Access-Control-Allow-Origin", "*"); |
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95 | } else { |
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96 | responseHeaders.add("Access-Control-Allow-Origin", origin); |
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97 | } |
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98 | String allowHeaders = requestHeaders.getFirstValue("Access-Control-Request-Headers", true); |
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99 | if (allowHeaders != null) { |
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100 | responseHeaders.add("Access-Control-Allow-Headers", allowHeaders); |
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101 | } |
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102 | responseHeaders.add("Access-Control-Allow-Credentials", "true"); |
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103 | responseHeaders.add("Access-Control-Max-Age", "60"); |
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104 | } |
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105 | |
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106 | /** |
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107 | * returns if authentication information from headers is valid. |
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108 | * |
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109 | * @param entity |
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110 | * @return |
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111 | */ |
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112 | public boolean isAuthenticated(Representation entity) { |
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113 | return (checkAuthToken(entity) != null); |
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114 | } |
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115 | |
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116 | /** |
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117 | * checks Annotator Auth plugin authentication information from headers. returns userId if successful. |
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118 | * |
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119 | * @param entity |
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120 | * @return |
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121 | */ |
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122 | public String checkAuthToken(Representation entity) { |
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123 | Form requestHeaders = (Form) getRequest().getAttributes().get("org.restlet.http.headers"); |
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124 | String authToken = requestHeaders.getFirstValue("x-annotator-auth-token", true); |
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125 | // decode token first to get consumer key |
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126 | JsonToken token = new JsonTokenParser(null, null).deserialize(authToken); |
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127 | String userId = token.getParamAsPrimitive("userId").getAsString(); |
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128 | String consumerKey = token.getParamAsPrimitive("consumerKey").getAsString(); |
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129 | // get stored consumer secret for key |
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130 | RestServer restServer = (RestServer) getApplication(); |
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131 | String consumerSecret = restServer.getConsumerSecret(consumerKey); |
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132 | logger.debug("requested consumer key=" + consumerKey + " secret=" + consumerSecret); |
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133 | if (consumerSecret == null) { |
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134 | return null; |
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135 | } |
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136 | // logger.debug(String.format("token=%s tokenString=%s signatureAlgorithm=%s",token,token.getTokenString(),token.getSignatureAlgorithm())); |
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137 | try { |
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138 | List<Verifier> verifiers = new ArrayList<Verifier>(); |
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139 | // we only do HS256 yet |
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140 | verifiers.add(new HmacSHA256Verifier(consumerSecret.getBytes("UTF-8"))); |
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141 | // verify token signature(should really be static...) |
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142 | new JsonTokenParser(new SystemClock(), null, (Checker[]) null).verify(token, verifiers); |
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143 | } catch (SignatureException e) { |
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144 | // TODO Auto-generated catch block |
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145 | e.printStackTrace(); |
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146 | } catch (InvalidKeyException e) { |
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147 | // TODO Auto-generated catch block |
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148 | e.printStackTrace(); |
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149 | } catch (UnsupportedEncodingException e) { |
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150 | // TODO Auto-generated catch block |
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151 | e.printStackTrace(); |
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152 | } |
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153 | // must be ok then |
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154 | logger.debug("auth OK! user=" + userId); |
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155 | return userId; |
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156 | } |
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157 | |
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158 | /** |
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159 | * creates Annotator-JSON from an Annotation object. |
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160 | * |
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161 | * @param annot |
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162 | * @return |
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163 | */ |
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164 | public JSONObject createAnnotatorJson(Annotation annot) { |
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165 | boolean makeUserObject = true; |
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166 | JSONObject jo = new JSONObject(); |
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167 | try { |
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168 | jo.put("text", annot.text); |
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169 | jo.put("uri", annot.url); |
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170 | |
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171 | if (makeUserObject) { |
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172 | // create user object |
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173 | JSONObject userObject = new JSONObject(); |
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174 | // save creator as uri |
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175 | userObject.put("uri", annot.creator); |
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176 | // make short user id |
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177 | String userID = annot.creator; |
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178 | if (userID.startsWith(NS.MPIWG_PERSONS_URL)) { |
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179 | userID = userID.replace(NS.MPIWG_PERSONS_URL, ""); // entferne |
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180 | // NAMESPACE |
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181 | } |
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182 | // save as id |
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183 | userObject.put("id", userID); |
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184 | // get full name |
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185 | RestServer restServer = (RestServer) getApplication(); |
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186 | String userName = restServer.getUserNameFromLdap(userID); |
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187 | userObject.put("name", userName); |
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188 | // save user object |
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189 | jo.put("user", userObject); |
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190 | } else { |
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191 | // save user as string |
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192 | jo.put("user", annot.creator); |
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193 | } |
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194 | |
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195 | List<String> xpointers = new ArrayList<String>(); |
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196 | if (annot.xpointers == null || annot.xpointers.size() == 0) |
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197 | xpointers.add(annot.xpointer); |
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198 | else { |
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199 | for (String xpointerString : annot.xpointers) { |
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200 | xpointers.add(xpointerString); |
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201 | } |
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202 | } |
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203 | if (!xpointers.isEmpty()) { |
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204 | // we only look at the first xpointer |
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205 | String xt = getXpointerType(xpointers.get(0)); |
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206 | if (xt == "range") { |
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207 | jo.put("ranges", transformToRanges(xpointers)); |
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208 | } else if (xt == "area") { |
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209 | jo.put("areas", transformToAreas(xpointers)); |
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210 | } |
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211 | } |
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212 | // encode Annotation URL (=id) in base64 |
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213 | String annotUrl = annot.getAnnotationUri(); |
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214 | String annotId = encodeJsonId(annotUrl); |
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215 | jo.put("id", annotId); |
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216 | return jo; |
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217 | } catch (JSONException e) { |
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218 | // TODO Auto-generated catch block |
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219 | e.printStackTrace(); |
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220 | } |
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221 | return null; |
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222 | } |
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223 | |
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224 | private String getXpointerType(String xpointer) { |
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225 | if (xpointer.contains("#xpointer")) { |
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226 | return "range"; |
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227 | } else if (xpointer.contains("#xywh")) { |
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228 | return "area"; |
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229 | } |
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230 | return null; |
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231 | } |
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232 | |
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233 | private JSONArray transformToRanges(List<String> xpointers) { |
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234 | |
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235 | JSONArray ja = new JSONArray(); |
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236 | |
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237 | Pattern rg = Pattern |
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238 | .compile("#xpointer\\(start-point\\(string-range\\(\"([^\"]*)\",([^,]*),1\\)\\)/range-to\\(end-point\\(string-range\\(\"([^\"]*)\",([^,]*),1\\)\\)\\)\\)"); |
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239 | Pattern rg1 = Pattern.compile("#xpointer\\(start-point\\(string-range\\(\"([^\"]*)\",([^,]*),1\\)\\)\\)"); |
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240 | |
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241 | try { |
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242 | for (String xpointer : xpointers) { |
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243 | String decoded = URLDecoder.decode(xpointer, "utf-8"); |
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244 | Matcher m = rg.matcher(decoded); |
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245 | |
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246 | if (m.find()) { |
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247 | { |
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248 | JSONObject jo = new JSONObject(); |
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249 | jo.put("start", m.group(1)); |
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250 | jo.put("startOffset", m.group(2)); |
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251 | jo.put("end", m.group(3)); |
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252 | jo.put("endOffset", m.group(4)); |
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253 | ja.put(jo); |
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254 | } |
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255 | } |
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256 | m = rg1.matcher(xpointer); |
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257 | if (m.find()) { |
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258 | JSONObject jo = new JSONObject(); |
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259 | jo.put("start", m.group(1)); |
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260 | jo.put("startOffset", m.group(2)); |
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261 | |
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262 | ja.put(jo); |
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263 | } |
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264 | } |
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265 | } catch (JSONException e) { |
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266 | // TODO Auto-generated catch block |
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267 | e.printStackTrace(); |
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268 | } catch (UnsupportedEncodingException e) { |
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269 | // TODO Auto-generated catch block |
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270 | e.printStackTrace(); |
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271 | } |
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272 | |
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273 | return ja; |
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274 | } |
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275 | |
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276 | private JSONArray transformToAreas(List<String> xpointers) { |
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277 | |
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278 | JSONArray ja = new JSONArray(); |
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279 | |
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280 | Pattern rg = Pattern.compile("#xywh=(\\w*:)([\\d\\.]+),([\\d\\.]+),([\\d\\.]+),([\\d\\.]+)"); |
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281 | |
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282 | try { |
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283 | for (String xpointer : xpointers) { |
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284 | String decoded = URLDecoder.decode(xpointer, "utf-8"); |
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285 | Matcher m = rg.matcher(decoded); |
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286 | |
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287 | if (m.find()) { |
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288 | { |
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289 | JSONObject jo = new JSONObject(); |
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290 | String unit = m.group(1); |
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291 | jo.put("x", m.group(2)); |
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292 | jo.put("y", m.group(3)); |
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293 | jo.put("width", m.group(4)); |
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294 | jo.put("height", m.group(5)); |
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295 | ja.put(jo); |
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296 | } |
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297 | } |
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298 | } |
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299 | } catch (JSONException e) { |
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300 | // TODO Auto-generated catch block |
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301 | e.printStackTrace(); |
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302 | } catch (UnsupportedEncodingException e) { |
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303 | // TODO Auto-generated catch block |
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304 | e.printStackTrace(); |
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305 | } |
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306 | |
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307 | return ja; |
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308 | } |
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309 | |
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310 | /** |
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311 | * creates an Annotation object with data from JSON. |
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312 | * |
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313 | * uses the specification from the annotator project: {@link https ://github.com/okfn/annotator/wiki/Annotation-format} |
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314 | * |
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315 | * The username will be transformed to an URI if not given already as URI, if not it will set to the MPIWG namespace defined in |
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316 | * de.mpiwg.itgroup.annotationManager.Constants.NS |
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317 | * |
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318 | * @param jo |
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319 | * @return |
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320 | * @throws JSONException |
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321 | */ |
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322 | public Annotation createAnnotation(JSONObject jo, Representation entity) throws JSONException { |
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323 | return updateAnnotation(new Annotation(), jo, entity); |
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324 | } |
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325 | |
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326 | public Annotation updateAnnotation(Annotation annot, JSONObject jo, Representation entity) throws JSONException { |
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327 | // annotated uri |
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328 | String url = annot.url; |
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329 | if (jo.has("uri")) { |
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330 | url = jo.getString("uri"); |
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331 | } |
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332 | // annotation text |
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333 | String text = annot.text; |
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334 | if (jo.has("text")) { |
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335 | text = jo.getString("text"); |
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336 | } |
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337 | // check authentication |
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338 | String authUser = checkAuthToken(entity); |
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339 | if (authUser == null) { |
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340 | // try http auth |
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341 | User httpUser = getHttpAuthUser(entity); |
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342 | if (httpUser == null) { |
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343 | setStatus(Status.CLIENT_ERROR_FORBIDDEN); |
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344 | return null; |
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345 | } |
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346 | authUser = httpUser.getIdentifier(); |
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347 | } |
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348 | // username not required, if no username given authuser will be used |
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349 | String username = null; |
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350 | String userUri = annot.creator; |
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351 | if (jo.has("user")) { |
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352 | if (jo.get("user") instanceof String) { |
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353 | // user is just a String |
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354 | username = jo.getString("user"); |
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355 | // TODO: what if username and authUser are different? |
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356 | } else { |
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357 | // user is an object |
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358 | JSONObject user = jo.getJSONObject("user"); |
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359 | if (user.has("id")) { |
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360 | username = user.getString("id"); |
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361 | } |
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362 | if (user.has("uri")) { |
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363 | userUri = user.getString("uri"); |
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364 | } |
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365 | } |
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366 | } |
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367 | if (username == null) { |
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368 | username = authUser; |
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369 | } |
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370 | // username should be a URI, if not it will set to the MPIWG namespace |
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371 | // defined in |
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372 | // de.mpiwg.itgroup.annotationManager.Constants.NS |
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373 | if (userUri == null) { |
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374 | if (username.startsWith("http")) { |
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375 | userUri = username; |
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376 | } else { |
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377 | userUri = NS.MPIWG_PERSONS_URL + username; |
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378 | } |
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379 | } |
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380 | // TODO: should we overwrite the creator? |
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381 | |
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382 | // create xpointer from the first range/area |
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383 | String xpointer = annot.xpointer; |
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384 | if (jo.has("ranges")) { |
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385 | JSONObject ranges = jo.getJSONArray("ranges").getJSONObject(0); |
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386 | String start = ranges.getString("start"); |
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387 | String end = ranges.getString("end"); |
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388 | String startOffset = ranges.getString("startOffset"); |
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389 | String endOffset = ranges.getString("endOffset"); |
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390 | |
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391 | try { |
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392 | xpointer = url |
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393 | + "#" |
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394 | + URLEncoder.encode(String.format( |
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395 | "xpointer(start-point(string-range(\"%s\",%s,1))/range-to(end-point(string-range(\"%s\",%s,1))))", |
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396 | start, startOffset, end, endOffset), "utf-8"); |
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397 | } catch (UnsupportedEncodingException e) { |
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398 | e.printStackTrace(); |
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399 | setStatus(Status.SERVER_ERROR_INTERNAL); |
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400 | return null; |
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401 | } |
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402 | } |
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403 | if (jo.has("areas")) { |
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404 | JSONObject area = jo.getJSONArray("areas").getJSONObject(0); |
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405 | String x = area.getString("x"); |
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406 | String y = area.getString("y"); |
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407 | String width = "0"; |
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408 | String height = "0"; |
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409 | if (area.has("width")) { |
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410 | width = area.getString("width"); |
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411 | height = area.getString("height"); |
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412 | } |
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413 | try { |
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414 | xpointer = url + "#" + URLEncoder.encode(String.format("xywh=fraction:%s,%s,%s,%s", x, y, width, height), "utf-8"); |
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415 | } catch (UnsupportedEncodingException e) { |
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416 | e.printStackTrace(); |
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417 | setStatus(Status.SERVER_ERROR_INTERNAL); |
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418 | return null; |
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419 | } |
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420 | } |
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421 | return new Annotation(xpointer, userUri, annot.time, text, annot.type); |
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422 | } |
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423 | |
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424 | /** |
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425 | * returns the logged in User. |
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426 | * |
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427 | * @param entity |
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428 | * @return |
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429 | */ |
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430 | protected User getHttpAuthUser(Representation entity) { |
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431 | RestServer restServer = (RestServer) getApplication(); |
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432 | if (!restServer.authenticate(getRequest(), getResponse())) { |
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433 | // Not authenticated |
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434 | return null; |
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435 | } |
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436 | |
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437 | ClientInfo ci = getRequest().getClientInfo(); |
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438 | logger.debug(ci); |
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439 | return getRequest().getClientInfo().getUser(); |
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440 | |
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441 | } |
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442 | |
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443 | } |
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