Add thumbnails generator for zip files

src/main/java/sh/rhiobet/lalafin/file/FileInfoService.java

@@ -22,6 +22,9 @@ public class FileInfoService {
 	@Inject
 	FileApiConfiguration fileApiConfiguration;
 
+	@Inject
+	ThumbnailService thumbnailService;
+
 	public FileInfoBase getInfo(List<PathSegment> names, FileTokenProvider fileTokenProvider) {
 		String requestedPath = "";
 		String requestedFilename = "";
@@ -128,7 +131,8 @@ public class FileInfoService {
 								contentInfo.viewUrl = "/view" + requestedUri + "/" + fileUri + "/0";
 							}
 						}
-						if (thumbPath != null && Files.exists(thumbPath)) {
+						if ((thumbPath != null && Files.exists(thumbPath))
+								|| thumbnailService.generateThumbnail(contentInfo, thumbPath)) {
 							contentInfo.thumbnailUrl =
 									"/file" + requestedUri + "/.thumbnails/" + fileUri + ".jpg";
 						}

src/main/java/sh/rhiobet/lalafin/file/ThumbnailService.java

@@ -0,0 +1,71 @@
+package sh.rhiobet.lalafin.file;
+
+import java.io.IOException;
+import java.net.URLDecoder;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.NoSuchElementException;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
+import javax.enterprise.context.ApplicationScoped;
+import javax.inject.Inject;
+import org.im4java.core.ConvertCmd;
+import org.im4java.core.IM4JavaException;
+import org.im4java.core.IMOperation;
+import sh.rhiobet.lalafin.api.configuration.FileApiConfiguration;
+import sh.rhiobet.lalafin.api.model.FileInfo;
+import sh.rhiobet.lalafin.api.model.FileInfoBase;
+
+@ApplicationScoped
+public class ThumbnailService {
+    @Inject
+    FileApiConfiguration fileApiConfiguration;
+
+    public boolean generateThumbnail(FileInfoBase fileInfoBase, Path thumbPath) {
+        if (fileInfoBase instanceof FileInfo) {
+            FileInfo fileInfo = (FileInfo) fileInfoBase;
+            if (fileInfo.filename.endsWith(".zip")) {
+                return this.generateThumbnailFromZip(fileInfo, thumbPath);
+            }
+        }
+        return false;
+    }
+
+    public boolean generateThumbnailFromZip(FileInfo fileInfo, Path thumbPath) {
+        Path zipPath = Paths.get(fileApiConfiguration.directory()
+                + URLDecoder.decode(fileInfo.directUrl, StandardCharsets.UTF_8));
+
+        Path tmpPath = null;
+        try {
+            ZipFile zipFile = new ZipFile(zipPath.toFile());
+            ZipEntry entry = zipFile.stream().filter(e -> !e.isDirectory()).findFirst().get();
+            tmpPath = Paths
+                    .get("/tmp/" + fileInfo.filename + "_" + entry.getName().replace("/", "_"));
+            Files.copy(zipFile.getInputStream(entry), tmpPath);
+            thumbPath.getParent().toFile().mkdirs();
+
+            ConvertCmd convert = new ConvertCmd();
+            IMOperation op = new IMOperation();
+            op.addImage(tmpPath.toString());
+            op.resize(200, null);
+            op.addImage(thumbPath.toString());
+            convert.run(op);
+
+            return true;
+        } catch (NoSuchElementException | IOException | InterruptedException | IM4JavaException e) {
+            e.printStackTrace();
+        } finally {
+            if (tmpPath != null) {
+                try {
+                    Files.delete(tmpPath);
+                } catch (IOException ignored) {
+                }
+            }
+        }
+
+        return false;
+    }
+
+}