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| package photospace.web; |
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| |
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| import java.awt.*; |
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4 |
| import java.awt.image.*; |
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5 |
| import java.io.*; |
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6 |
| import java.text.*; |
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7 |
| import java.util.*; |
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8 |
| import javax.servlet.*; |
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| import javax.servlet.http.*; |
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10 |
| import org.apache.commons.logging.*; |
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11 |
| import org.springframework.context.*; |
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| import org.springframework.web.context.support.*; |
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13 |
| import com.sun.image.codec.jpeg.*; |
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14 |
| import photospace.graphics.*; |
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15 |
| import photospace.vfs.*; |
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| |
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17 |
| public class ImageServlet |
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18 |
| extends HttpServlet |
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19 |
| { |
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| private static final Log log = LogFactory.getLog(ImageServlet.class); |
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| |
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22 |
| private static final int inputBufferSize = 2048; |
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| private static final int outputBufferSize = 2048; |
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24 |
| private static final SimpleDateFormat format; |
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25 |
| static |
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26 |
| { |
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27 |
0
| format = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US);
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0
| format.setTimeZone(TimeZone.getTimeZone("GMT"));
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29 |
| } |
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30 |
| |
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| private FileSystem filesystem; |
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| private int expires = 30; |
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| private ImageCache images; |
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| |
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35 |
0
| public void init(ServletConfig config) throws ServletException
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36 |
| { |
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37 |
0
| super.init(config);
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38 |
| |
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39 |
0
| if (config.getInitParameter("expires-seconds") != null)
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40 |
0
| expires = Integer.parseInt(config.getInitParameter("expires-seconds"));
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41 |
| |
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42 |
0
| ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(config.getServletContext());
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43 |
0
| if (context != null)
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| { |
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0
| filesystem = (FileSystem) context.getBean("filesystem");
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46 |
0
| images = (ImageCache) context.getBean("imageCache");
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47 |
| } |
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48 |
| else |
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49 |
| { |
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50 |
0
| filesystem = new FileSystemImpl();
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51 |
0
| try
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52 |
| { |
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53 |
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| filesystem.setRoot(new File(config.getServletContext().getRealPath("/")));
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54 |
| } |
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55 |
| catch (IOException e) |
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56 |
| { |
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57 |
0
| throw new ServletException(e);
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58 |
| } |
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59 |
0
| images = new ImageCache();
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60 |
0
| images.setRoot(new File(System.getProperty("java.io.tmpdir")));
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61 |
| } |
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62 |
| } |
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63 |
| |
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64 |
0
| public void doGet(HttpServletRequest request, HttpServletResponse response)
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| throws ServletException, IOException |
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66 |
| { |
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0
| String path = request.getPathInfo();
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68 |
| |
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0
| if (path == null)
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70 |
| { |
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0
| sendNotFound(response, path);
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0
| return;
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73 |
| } |
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74 |
| |
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| |
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0
| File file;
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0
| try
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78 |
| { |
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| file = filesystem.getAsset(path);
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80 |
| } |
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81 |
| catch (FileNotFoundException e) |
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82 |
| { |
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83 |
0
| sendNotFound(response, path);
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84 |
0
| return;
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85 |
| } |
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86 |
| |
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87 |
0
| String lastModified = format.format(new Date(file.lastModified()));
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88 |
0
| String ifModified = request.getHeader("If-Modified-Since");
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89 |
0
| if (ifModified != null && ifModified.startsWith(lastModified))
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90 |
| { |
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91 |
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| if (log.isDebugEnabled()) log.debug("Sending 403 for " + file);
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| response.setHeader("Expires", getExpires());
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| response.sendError(HttpServletResponse.SC_NOT_MODIFIED);
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0
| return;
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95 |
| } |
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96 |
| |
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0
| String contentType = getServletContext().getMimeType(file.getPath());
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| response.setContentType(contentType);
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| response.setHeader("Last-Modified", lastModified);
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| response.setHeader("Expires", getExpires());
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| |
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| if (log.isDebugEnabled()) log.debug("Serving " + file + " for " + request.getQueryString());
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103 |
| |
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104 |
0
| int width = -1;
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105 |
0
| int height = -1;
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106 |
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| if (!isEmpty(request.getParameter("w"))) width = (int) Double.parseDouble(request.getParameter("w"));
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107 |
0
| if (!isEmpty(request.getParameter("h"))) height = (int) Double.parseDouble(request.getParameter("h"));
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108 |
0
| if (width > 0 || height > 0)
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|
109 |
| { |
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110 |
0
| Transform transform = new Transform(new Dimension(width, height), request.getParameter("scale"));
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111 |
| |
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112 |
0
| File cached = images.cachedFile(path, transform);
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113 |
0
| if (cached.exists() && cached.lastModified() >= file.lastModified())
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114 |
| { |
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115 |
0
| log.debug("Using cached file " + cached);
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116 |
0
| sendFile(response, cached);
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117 |
0
| return;
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118 |
| } |
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119 |
| |
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120 |
0
| synchronized (this.getClass())
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121 |
| { |
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122 |
0
| BufferedImage image = images.scale(Sampler.read(file), path, transform);
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123 |
| |
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124 |
0
| response.setContentLength(Sampler.getBytes(image).length);
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125 |
0
| write(image, response.getOutputStream());
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126 |
| } |
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127 |
| } |
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128 |
| else |
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129 |
| { |
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130 |
0
| sendFile(response, file);
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131 |
| } |
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132 |
| } |
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133 |
| |
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134 |
0
| private void sendFile(HttpServletResponse response, File file)
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135 |
| throws IOException |
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136 |
| { |
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137 |
0
| response.setContentLength((int) file.length());
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138 |
0
| write(file, response.getOutputStream());
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139 |
| } |
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140 |
| |
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141 |
0
| private boolean isEmpty(String s)
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|
142 |
| { |
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143 |
0
| return s == null || "".equals(s);
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|
144 |
| } |
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145 |
| |
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146 |
0
| private String getExpires()
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|
147 |
| { |
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148 |
0
| return format.format(new Date(new Date().getTime() + expires * 1000));
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|
149 |
| } |
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150 |
| |
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151 |
0
| private void write(BufferedImage image, OutputStream out) throws IOException
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|
152 |
| { |
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153 |
0
| JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
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154 |
0
| encoder.encode(image);
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155 |
0
| out.close();
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|
156 |
| } |
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157 |
| |
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158 |
0
| private void write(File file, OutputStream out) throws IOException
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|
159 |
| { |
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160 |
0
| InputStream in = new BufferedInputStream(new FileInputStream(file));
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161 |
0
| write(in, out);
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|
162 |
| } |
|
163 |
| |
|
164 |
0
| public static void write(InputStream in, OutputStream out) throws IOException
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|
165 |
| { |
|
166 |
0
| byte buffer[] = new byte[inputBufferSize];
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|
167 |
0
| int len = buffer.length;
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|
168 |
| |
|
169 |
0
| try
|
|
170 |
| { |
|
171 |
0
| while (true)
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|
172 |
| { |
|
173 |
0
| len = in.read(buffer);
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|
174 |
0
| if (len == -1) break;
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175 |
0
| out.write(buffer, 0, len);
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|
176 |
| } |
|
177 |
| } |
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178 |
| finally |
|
179 |
| { |
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180 |
0
| try { in.close(); }
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181 |
0
| finally { out.close(); }
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|
182 |
| } |
|
183 |
| } |
|
184 |
| |
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185 |
0
| private void sendNotFound(HttpServletResponse response, String path) throws IOException
|
|
186 |
| { |
|
187 |
0
| response.sendError(HttpServletResponse.SC_NOT_FOUND, path + " is not an existing photo");
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188 |
0
| return;
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|
189 |
| } |
|
190 |
| } |
