Add Download ability

src/main/java/ru/redrise/marinesco/BookController.java

@@ -6,12 +6,9 @@ import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestMapping;
 
-import lombok.extern.slf4j.Slf4j;
 import ru.redrise.marinesco.data.InpEntryRepository;
-import ru.redrise.marinesco.library.Author;
 import ru.redrise.marinesco.library.InpEntry;
 
-@Slf4j
 @Controller
 @RequestMapping("/book")
 public class BookController {

src/main/java/ru/redrise/marinesco/DownloadController.java

@@ -0,0 +1,89 @@
+package ru.redrise.marinesco;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.nio.charset.StandardCharsets;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipInputStream;
+
+import org.springframework.core.io.FileSystemResource;
+import org.springframework.http.ContentDisposition;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+
+import jakarta.servlet.ServletOutputStream;
+import jakarta.servlet.http.HttpServletResponse;
+import lombok.extern.slf4j.Slf4j;
+import ru.redrise.marinesco.settings.ApplicationSettings;
+
+@Slf4j
+@Controller
+@RequestMapping("/download")
+public class DownloadController {
+
+    private String filesLocation;
+
+    public DownloadController(ApplicationSettings applicationSettings) {
+        this.filesLocation = applicationSettings.getFilesLocation();
+    }
+
+    @GetMapping(value = "/")
+    public void getMethodName(@RequestParam String container,
+            @RequestParam String file,
+            HttpServletResponse response) throws Exception {
+
+        final FileSystemResource libraryLocation = new FileSystemResource(filesLocation + File.separator + container);
+        try (ZipInputStream zipInputStream = new ZipInputStream(libraryLocation.getInputStream())) {
+            ZipEntry zipEntry = zipInputStream.getNextEntry();
+
+            while (zipEntry != null) {
+                if (zipEntry.getName().contains(file)) {
+                    response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
+                    response.setHeader(HttpHeaders.CONTENT_DISPOSITION, ContentDisposition.attachment()
+                            .filename(file+".fb2", StandardCharsets.UTF_8)  //TODO: fix
+                            .build()
+                            .toString());
+                    ServletOutputStream outStream = response.getOutputStream();
+                    sendFile(zipEntry.getSize(), zipInputStream, outStream);
+                    outStream.flush();
+                    outStream.close();
+                    return;
+                }
+
+                zipEntry = zipInputStream.getNextEntry();
+            }
+        }
+        throw new Exception("file not found " +
+                filesLocation + File.separator + container + " → " + file);
+    }
+
+    private void sendFile(long fileSize,
+            ZipInputStream zipInputStream,
+            ServletOutputStream outStream) throws Exception {
+
+        int blockSize = 0x200;
+
+        if (fileSize < 0x200)
+            blockSize = (int) fileSize;
+
+        byte[] block = new byte[blockSize];
+        long i = 0;
+
+        while (true) {
+            int actuallyRead = zipInputStream.read(block);
+            outStream.write(block, 0, actuallyRead);
+            i += actuallyRead;
+            if ((i + blockSize) > fileSize) {
+                blockSize = (int) (fileSize - i);
+                if (blockSize == 0)
+                    break;
+                block = new byte[blockSize];
+            }
+        }
+    }
+
+}

src/main/java/ru/redrise/marinesco/library/InpxScanner.java

@@ -17,27 +17,29 @@ import ru.redrise.marinesco.data.AuthorRepository;
 import ru.redrise.marinesco.data.GenreRepository;
 import ru.redrise.marinesco.data.InpEntryRepository;
 import ru.redrise.marinesco.data.LibraryMetadataRepository;
+import ru.redrise.marinesco.settings.ApplicationSettings;
 
 @Slf4j
 @Component
-@ConfigurationProperties(prefix = "marinesco.library")
 public class InpxScanner implements Runnable {
 
     private static volatile Thread parser;
     private static volatile String lastRunErrors;
 
-    private String filesLocation = "";
-
     private LibraryMetadata libraryMetadata;
     private LibraryMetadataRepository libraryMetadataRepository;
     private AuthorRepository authorRepository;
     private GenreRepository genreRepository;
     private InpEntryRepository inpEntryRepository;
 
-    public InpxScanner(AuthorRepository authorRepository,
+    private String filesLocation;
+
+    public InpxScanner(ApplicationSettings applicationSettings,
+            AuthorRepository authorRepository,
             GenreRepository genreRepository,
             InpEntryRepository inpEntryRepository,
             LibraryMetadataRepository libraryMetadataRepository) {
+        this.filesLocation = applicationSettings.getFilesLocation();
         this.authorRepository = authorRepository;
         this.genreRepository = genreRepository;
         this.inpEntryRepository = inpEntryRepository;
@@ -47,7 +49,7 @@ public class InpxScanner implements Runnable {
     /*
      * @return true if executed, false if already running
      */
-    public boolean reScan(){
+    public boolean reScan() {
         if (parser == null || !parser.isAlive()) {
             parser = new Thread(this);
             parser.start();
@@ -190,14 +192,6 @@ public class InpxScanner implements Runnable {
         return i + 1 < content.length && (content[i + 1] == '\r');
     }
 
-    public String getFilesLocation() {
-        return filesLocation;
-    }
-
-    public void setFilesLocation(String location) {
-        filesLocation = location;
-    }
-
     public static String getLastRunErrors() {
         return lastRunErrors;
     }

src/main/java/ru/redrise/marinesco/settings/ApplicationSettings.java

@@ -1,11 +1,15 @@
 package ru.redrise.marinesco.settings;
 
+import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.stereotype.Component;
 
 @Component
+@ConfigurationProperties(prefix = "marinesco.library")
 public class ApplicationSettings {
     private static final String ALLOW_REGISTRATION = "allow_registration";
     
+    private String filesLocation = "";
+
     private KeyValueRepository keyValueRepository;
 
     private boolean registrationAllowed;
@@ -34,4 +38,13 @@ public class ApplicationSettings {
     public synchronized boolean isRegistrationAllowed() {
         return registrationAllowed;
     }
+
+    public String getFilesLocation() {
+        return filesLocation;
+    }
+
+    public void setFilesLocation(String location) {
+        filesLocation = location;
+    }
+
 }

src/main/resources/templates/book.html

@@ -29,7 +29,7 @@
                 <br /><span th:if="${book.addedDate} != null" th:text="${'Added : ' + book.addedDate}"></span>
                 <br /><span th:text="${'Size: ' + book.fileSize + ' bytes'}"></span>
                 <p>
-                    <a th:href="'/'" th:text="Download"></a>
+                    <a th:href="${'/download/?container=' + book.container + '&file=' + book.fsFileName}" th:text="Download"></a>
                 </p>
             </div>
         </div>