Closes #172: smart images caching

docs-core/src/main/java/com/sismics/util/HttpUtil.java

@@ -1,14 +1,8 @@
 package com.sismics.util;
 
-import org.slf4j.Logger;
+import java.text.SimpleDateFormat;
-import org.slf4j.LoggerFactory;
+import java.util.Date;
-
+import java.util.Locale;
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStreamReader;
-import java.io.OutputStreamWriter;
-import java.net.URL;
-import java.net.URLConnection;
 
 /**
  * HTTP request utilities.
@@ -17,77 +11,17 @@ import java.net.URLConnection;
  */
 public class HttpUtil {
     /**
-     * Logger.
+     * Format of the expires header.
      */
-    private static final Logger log = LoggerFactory.getLogger(HttpUtil.class);
+    private static final SimpleDateFormat EXPIRES_FORMAT = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss Z", Locale.ENGLISH);
 
     /**
-     * Loads the content of an URL into a string.
+     * Build an Expires HTTP header.
      *
-     * @param url URL to load
+     * @param futureTime Expire interval
-     * @return Contents of the resource
+     * @return Formatted header value
      */
-    public static String readUrlIntoString(URL url) {
+    public static String buildExpiresHeader(long futureTime) {
-        URLConnection connection;
+        return EXPIRES_FORMAT.format(new Date().getTime() + futureTime);
-        BufferedReader in = null;
-        try {
-            connection = url.openConnection();
-            in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
-            StringBuilder sb = new StringBuilder();
-            String inputLine;
-            while ((inputLine = in.readLine()) != null) {
-                sb.append(inputLine);
-            }
-            return sb.toString();
-        } catch (IOException e) {
-            if (log.isErrorEnabled()) {
-                log.error("Error reading URL", e);
-            }
-            return null;
-        } finally {
-            if (in != null) {
-                try {
-                    in.close();
-                } catch (Exception e) {
-                    // NOP
-                }
-            }
-        }
-    }
-    
-    public static String postUrl(URL url, String data) throws IOException {
-        OutputStreamWriter wr = null;
-        BufferedReader rd = null;
-        try {
-            URLConnection conn = url.openConnection();
-            conn.setDoOutput(true);
-            wr = new OutputStreamWriter(conn.getOutputStream());
-            wr.write(data);
-            wr.flush();
-    
-            // Get the response
-            rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
-            StringBuilder sb = new StringBuilder();
-            String line = null;
-            while ((line = rd.readLine()) != null) {
-                sb.append(line).append("\n");
-            }
-            return sb.toString();
-        } finally {
-            if (wr != null) {
-                try {
-                    wr.close();
-                } catch (IOException e) {
-                    // NOP
-                }
-            }
-            if (rd != null) {
-                try {
-                    rd.close();
-                } catch (IOException e) {
-                    // NOP
-                }
-            }
-        }
     }
 }

docs-web/src/main/java/com/sismics/docs/rest/resource/FileResource.java

@@ -14,12 +14,16 @@ import com.sismics.docs.core.event.FileCreatedAsyncEvent;
 import com.sismics.docs.core.event.FileDeletedAsyncEvent;
 import com.sismics.docs.core.model.jpa.File;
 import com.sismics.docs.core.model.jpa.User;
-import com.sismics.docs.core.util.*;
+import com.sismics.docs.core.util.DirectoryUtil;
+import com.sismics.docs.core.util.EncryptionUtil;
+import com.sismics.docs.core.util.FileUtil;
+import com.sismics.docs.core.util.PdfUtil;
 import com.sismics.rest.exception.ClientException;
 import com.sismics.rest.exception.ForbiddenClientException;
 import com.sismics.rest.exception.ServerException;
 import com.sismics.rest.util.JsonUtil;
 import com.sismics.rest.util.ValidationUtil;
+import com.sismics.util.HttpUtil;
 import com.sismics.util.context.ThreadLocalContext;
 import com.sismics.util.mime.MimeType;
 import com.sismics.util.mime.MimeTypeUtil;
@@ -30,18 +34,19 @@ import javax.json.Json;
 import javax.json.JsonArrayBuilder;
 import javax.json.JsonObjectBuilder;
 import javax.ws.rs.*;
+import javax.ws.rs.core.HttpHeaders;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import javax.ws.rs.core.Response.Status;
 import javax.ws.rs.core.StreamingOutput;
-import java.io.*;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
 import java.net.URISyntaxException;
 import java.nio.file.Files;
 import java.nio.file.Paths;
 import java.nio.file.StandardCopyOption;
 import java.text.MessageFormat;
-import java.text.SimpleDateFormat;
-import java.util.Date;
 import java.util.List;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipOutputStream;
@@ -581,9 +586,10 @@ public class FileResource extends BaseResource {
         }
 
         return Response.ok(stream)
-                .header("Content-Disposition", "inline; filename=" + file.getFullName("data"))
+                .header(HttpHeaders.CONTENT_DISPOSITION, "inline; filename=" + file.getFullName("data"))
-                .header("Content-Type", mimeType)
+                .header(HttpHeaders.CONTENT_TYPE, mimeType)
-                .header("Expires", new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss Z").format(new Date().getTime() + 3600000 * 24))
+                .header(HttpHeaders.CACHE_CONTROL, "private")
+                .header(HttpHeaders.EXPIRES, HttpUtil.buildExpiresHeader(3_600_000L * 24L * 365L))
                 .build();
     }
     

docs-web/src/main/java/com/sismics/docs/rest/resource/ThemeResource.java

@@ -12,12 +12,14 @@ import com.sismics.rest.exception.ForbiddenClientException;
 import com.sismics.rest.exception.ServerException;
 import com.sismics.rest.util.JsonUtil;
 import com.sismics.rest.util.ValidationUtil;
+import com.sismics.util.HttpUtil;
 import com.sismics.util.css.Selector;
 import org.glassfish.jersey.media.multipart.FormDataBodyPart;
 import org.glassfish.jersey.media.multipart.FormDataParam;
 
 import javax.json.*;
 import javax.ws.rs.*;
+import javax.ws.rs.core.HttpHeaders;
 import javax.ws.rs.core.Response;
 import javax.ws.rs.core.StreamingOutput;
 import java.io.IOException;
@@ -26,8 +28,6 @@ import java.io.OutputStream;
 import java.io.StringReader;
 import java.nio.file.Files;
 import java.nio.file.StandardCopyOption;
-import java.text.SimpleDateFormat;
-import java.util.Date;
 import java.util.Map;
 
 /**
@@ -235,8 +235,9 @@ public class ThemeResource extends BaseResource {
                 }
             }
         })
-        .header("Content-Type", "image/*")
+        .header(HttpHeaders.CONTENT_TYPE, "image/*")
-        .header("Expires", new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss Z").format(new Date().getTime() + 3600000 * 24 * 15))
+        .header(HttpHeaders.CACHE_CONTROL, "public")
+        .header(HttpHeaders.EXPIRES, HttpUtil.buildExpiresHeader(3_600_000L * 24L * 15L))
         .build();
     }