[kbss-cvut/termit-ui#449] Modify Excel template download so that it (…

…hopefully) works also in a Docker container.

Dockerfile

@@ -16,7 +16,7 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #
 
-FROM maven:3-eclipse-temurin-17 as build
+FROM maven:3-eclipse-temurin-17 AS build
 
 WORKDIR /termit
 
@@ -31,7 +31,7 @@ COPY src src
 
 RUN mvn package -B -P graphdb,standalone -DskipTests=true
 
-FROM eclipse-temurin:17-jdk-alpine as runtime
+FROM eclipse-temurin:17-jdk-alpine AS runtime
 COPY --from=build  /termit/target/termit.jar termit.jar
 
 EXPOSE 8080

src/main/java/cz/cvut/kbss/termit/service/business/VocabularyService.java

@@ -26,7 +26,6 @@
 import cz.cvut.kbss.termit.dto.listing.VocabularyDto;
 import cz.cvut.kbss.termit.event.VocabularyCreatedEvent;
 import cz.cvut.kbss.termit.exception.NotFoundException;
-import cz.cvut.kbss.termit.exception.TermItException;
 import cz.cvut.kbss.termit.model.Vocabulary;
 import cz.cvut.kbss.termit.model.acl.AccessControlList;
 import cz.cvut.kbss.termit.model.acl.AccessControlRecord;
@@ -44,6 +43,7 @@
 import cz.cvut.kbss.termit.service.security.authorization.VocabularyAuthorizationService;
 import cz.cvut.kbss.termit.service.snapshot.SnapshotProvider;
 import cz.cvut.kbss.termit.util.Configuration;
+import cz.cvut.kbss.termit.util.TypeAwareClasspathResource;
 import cz.cvut.kbss.termit.util.TypeAwareResource;
 import org.jetbrains.annotations.NotNull;
 import org.slf4j.Logger;
@@ -61,7 +61,6 @@
 
 import java.io.File;
 import java.net.URI;
-import java.net.URISyntaxException;
 import java.time.Instant;
 import java.util.ArrayList;
 import java.util.Collection;
@@ -259,15 +258,14 @@ public Vocabulary importVocabulary(URI vocabularyIri, MultipartFile file) {
      */
     public TypeAwareResource getExcelTemplateFile() {
         final Configuration config = context.getBean(Configuration.class);
-        final File templateFile = config.getTemplate().getExcelImport().map(File::new).orElseGet(() -> {
-            try {
-                assert getClass().getClassLoader().getResource("template/termit-import.xlsx") != null;
-                return new File(getClass().getClassLoader().getResource("template/termit-import.xlsx").toURI());
-            } catch (URISyntaxException e) {
-                throw new TermItException("Fatal error, unable to load Excel template file.", e);
-            }
-        });
-        return new TypeAwareFileSystemResource(templateFile, ExportFormat.EXCEL.getMediaType());
+        return config.getTemplate().getExcelImport().map(File::new)
+                     .map(f -> (TypeAwareResource) new TypeAwareFileSystemResource(f,
+                                                                                   ExportFormat.EXCEL.getMediaType()))
+                     .orElseGet(() -> {
+                         assert getClass().getClassLoader().getResource("template/termit-import.xlsx") != null;
+                         return new TypeAwareClasspathResource("template/termit-import.xlsx",
+                                                               ExportFormat.EXCEL.getMediaType());
+                     });
     }
 
     @Override

src/main/java/cz/cvut/kbss/termit/service/export/util/TypeAwareByteArrayResource.java

@@ -52,13 +52,12 @@ public boolean equals(Object o) {
         if (this == o) {
             return true;
         }
-        if (!(o instanceof TypeAwareByteArrayResource)) {
+        if (!(o instanceof TypeAwareByteArrayResource that)) {
             return false;
         }
         if (!super.equals(o)) {
             return false;
         }
-        TypeAwareByteArrayResource that = (TypeAwareByteArrayResource) o;
         return Objects.equals(mediaType, that.mediaType) &&
                 Objects.equals(fileExtension, that.fileExtension);
     }

src/main/java/cz/cvut/kbss/termit/util/TypeAwareClasspathResource.java

@@ -0,0 +1,29 @@
+package cz.cvut.kbss.termit.util;
+
+import org.springframework.core.io.ClassPathResource;
+
+import java.util.Optional;
+
+/**
+ * Implementation of {@link TypeAwareResource} for files on classpath.
+ */
+public class TypeAwareClasspathResource extends ClassPathResource implements TypeAwareResource {
+
+    private final String mediaType;
+
+    public TypeAwareClasspathResource(String path, String mediaType) {
+        super(path);
+        this.mediaType = mediaType;
+    }
+
+    @Override
+    public Optional<String> getMediaType() {
+        return Optional.ofNullable(mediaType);
+    }
+
+    @Override
+    public Optional<String> getFileExtension() {
+        return getPath().contains(".") ? Optional.of(getPath().substring(getPath().lastIndexOf("."))) :
+               Optional.empty();
+    }
+}

src/main/java/cz/cvut/kbss/termit/util/TypeAwareResource.java

@@ -26,6 +26,8 @@
  * <p>
  * Allows to get MIME type of the resource and the associated file extension. However, both methods return
  * {@link Optional} to accommodate resources which may not support this feature.
+ *
+ * TODO Move all implementations into the same package!
  */
 public interface TypeAwareResource extends Resource {