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1 package nabble.view.web.forum;
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2
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3 import fschmidt.util.java.ImageUtils;
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4 import fschmidt.util.java.IoUtils;
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5 import fschmidt.util.servlet.AuthorizingServlet;
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6 import fschmidt.util.servlet.CanonicalUrl;
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7 import fschmidt.util.servlet.JtpContext;
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8 import nabble.model.FileUpload;
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9 import nabble.model.Message;
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10 import nabble.model.Node;
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11 import nabble.model.Site;
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12 import nabble.model.SystemProperties;
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13 import nabble.view.lib.Cache;
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14 import nabble.view.lib.Jtp;
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15 import nabble.view.lib.UrlMappable;
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16 import org.apache.commons.fileupload.FileItem;
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17
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18 import javax.servlet.ServletException;
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19 import javax.servlet.http.HttpServlet;
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20 import javax.servlet.http.HttpServletRequest;
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21 import javax.servlet.http.HttpServletResponse;
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22 import java.awt.image.BufferedImage;
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23 import java.io.IOException;
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24 import java.io.InputStream;
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25 import java.net.URL;
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26 import java.util.HashMap;
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27 import java.util.Map;
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28 import java.util.regex.Matcher;
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29 import java.util.regex.Pattern;
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30
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31
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32 public class Thumbnail extends HttpServlet implements UrlMappable, AuthorizingServlet, CanonicalUrl {
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33
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34 private static final String NABBLE_IMAGE_CODE = "<nabble_img src=\"";
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35 private static final Pattern YOUTUBE_PATTERN = Pattern.compile("[ ]src[ ]*=[ ]*\"(https?:)?//www\\.youtube(-nocookie)?\\.com/(v|embed)/([^&?\"]*)(.*)\"");
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36 private static final Pattern EXTERNAL_IMG_PATTERN = Pattern.compile("<img(\\s|\\w|=|\"|')+src[ ]*=[ ]*[\"|'](\\S+)[\"|']");
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37
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38 private static final Pattern URL_PATTERN = Pattern.compile("/file/thumb/n(\\d+)(/(.+))?$");
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39
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40 public static String url(Node node, String fileName) {
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41 return node.getSite().getBaseUrl() + path(node,fileName);
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42 }
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43
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44 public static String path(Node node, String fileName) {
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45 return "/file/thumb/n" + node.getId() + (fileName == null? "" : '/' + fileName);
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46 }
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47
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48 public String getCanonicalUrl(HttpServletRequest request) {
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49 Site site = Jtp.getSite(request);
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50 if( site == null )
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51 return null;
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52 return url(site.getNode(Long.parseLong(request.getParameter("node"))), request.getParameter("filename"));
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53 }
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54
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55 public Map<String,String[]> getParameterMapFromUrl(HttpServletRequest request,String mappedUrl) {
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56 Matcher m = URL_PATTERN.matcher(mappedUrl);
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57 if (!m.find())
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58 throw new RuntimeException();
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59 Map<String,String[]> params = new HashMap<String,String[]>();
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60 String nodeIdS = m.group(1);
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61 params.put("node", new String[]{nodeIdS});
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62 String fileName = m.group(2);
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63 if (fileName != null && fileName.length() > 1)
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64 params.put("filename", new String[]{fileName.substring(1)});
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65 return params;
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66 }
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67
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68 public Pattern getUrlPattern() {
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69 return URL_PATTERN;
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70 }
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71
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72 public String getAuthorizationKey(HttpServletRequest request) throws ServletException {
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73 return Jtp.getReadAuthorizationKey( Jtp.getSiteNotNull(request).getNode(Jtp.getLong(request,"node")));
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74 }
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75
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76 public boolean authorize(String key,HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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77 return Jtp.authorizeForRead(key,request,response);
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78 }
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79
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80 protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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81 Node node = Jtp.getSiteNotNull(request).getNode(Jtp.getLong(request, "node"));
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82 if (node == null)
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83 return;
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84
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85 JtpContext jtpContext = (JtpContext)getServletContext().getAttribute(JtpContext.attrName);
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86 jtpContext.setEtag(request,response,Cache.nodeChangeEvent(node));
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87
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88 String fileName = request.getParameter("filename");
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89 BufferedImage img = getImage(node, fileName, response);
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90 if (img == null) {
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91 response.sendError(HttpServletResponse.SC_NOT_FOUND);
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92 return;
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93 }
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94
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95 InputStream in = null;
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96 try {
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97 img = ImageUtils.getThumbnail(img, 140, 100);
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98 in = ImageUtils.asInputStream(img, "jpg");
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99 IoUtils.copyAll(in, response.getOutputStream());
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100 } finally {
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101 if (in != null)
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102 in.close();
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103 }
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104 }
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105
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106 private BufferedImage getImage(Node node, String fileName, HttpServletResponse response)
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107 throws ServletException
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108 {
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109 if (fileName == null) {
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110 try {
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111 String message = node.getMessage().getRaw();
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112 Matcher m = EXTERNAL_IMG_PATTERN.matcher(message);
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113 if (m.find()) {
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114 String imgUrl = m.group(2);
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115 FileItem fi = new FileUpload.UrlFileItem(new URL(imgUrl));
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116 response.setContentType(FileDownload.getMimeByExtension(imgUrl));
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117 return ImageUtils.getImage(fi.getInputStream());
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118 }
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119 } catch(IOException e) {
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120 throw new ServletException("getImage failed",e);
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121 }
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122 } else {
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123 try {
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124 Message.Source src = Message.SourceType.getType('n').getSource(node.getSite(),node.getId());
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125 InputStream in = FileUpload.getFileContent(src,fileName);
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126 if (in != null) {
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127 response.setContentType(FileDownload.getMimeByExtension(fileName));
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128 try {
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129 return ImageUtils.getImage(in);
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130 } finally {
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131 in.close();
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132 }
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133 }
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134 } catch(IOException e) {
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135 throw new RuntimeException("getImage failed",e);
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136 }
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137 }
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138 return null;
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139 }
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140
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141 public static String getThumbnailFile(Node node) {
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142 String src = null;
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143
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144 String message = node.getMessage().getRaw();
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145 int posStart = message.indexOf(NABBLE_IMAGE_CODE);
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146 if (posStart >= 0) {
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147 int srcStart = posStart + NABBLE_IMAGE_CODE.length();
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148 int posEnd = message.indexOf("\"", srcStart);
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149 src = "/file/thumb/n" + node.getId() + '/' + message.substring(srcStart, posEnd);
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150 }
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151 if (src == null) {
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152 // Let's check for youtube videos
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153 Matcher m = YOUTUBE_PATTERN.matcher(message);
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154 if(m.find()) {
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155 String code = m.group(4);
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156 src = "http://i1.ytimg.com/vi/" + code + "/default.jpg";
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157 }
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158 }
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159 if (src == null) {
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160 Matcher m = EXTERNAL_IMG_PATTERN.matcher(message);
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161 if(m.find()) {
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162 return "/file/thumb/n" + node.getId();
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163 }
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164 }
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165 return src;
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166 }
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167 }
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