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fix(epub-cover-extract): improve cover image extraction with fallback handling (#2585)

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Signed-off-by: Balázs Szücs <bszucs1209@gmail.com>
This commit is contained in:
Balázs Szücs
2026-02-02 18:26:49 +01:00
committed by GitHub
parent 2cbb0c80a2
commit cb5f703c7e
1 changed files with 11 additions and 4 deletions
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15
booklore-api/src/main/java/org/booklore/service/metadata/extractor/EpubMetadataExtractor.java
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@@ -1,6 +1,5 @@
package org.booklore.service.metadata.extractor;
import org.booklore.model.dto.BookMetadata;
import io.documentnode.epub4j.domain.Book;
import io.documentnode.epub4j.epub.EpubReader;
import lombok.extern.slf4j.Slf4j;
@@ -8,6 +7,7 @@ import net.lingala.zip4j.ZipFile;
import net.lingala.zip4j.model.FileHeader;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.lang3.StringUtils;
import org.booklore.model.dto.BookMetadata;
import org.springframework.boot.configurationprocessor.json.JSONArray;
import org.springframework.boot.configurationprocessor.json.JSONException;
import org.springframework.boot.configurationprocessor.json.JSONObject;
@@ -97,9 +97,16 @@ public class EpubMetadataExtractor implements FileMetadataExtractor {
@Override
public byte[] extractCover(File epubFile) {
Book epub = null;
io.documentnode.epub4j.domain.Resource coverImage = null;
try (FileInputStream fis = new FileInputStream(epubFile)) {
Book epub = new EpubReader().readEpub(fis);
io.documentnode.epub4j.domain.Resource coverImage = epub.getCoverImage();
try {
epub = new EpubReader().readEpub(fis);
coverImage = epub.getCoverImage();
} catch (Exception e) {
log.debug("epub4j failed to parse EPUB for cover extraction (will try fallbacks): {}", e.getMessage());
}
if (coverImage == null) {
String coverHref = findCoverImageHrefInOpf(epubFile);
@@ -120,7 +127,7 @@ public class EpubMetadataExtractor implements FileMetadataExtractor {
}
}
if (coverImage == null) {
if (coverImage == null && epub != null) {
for (io.documentnode.epub4j.domain.Resource res : epub.getResources().getAll()) {
String id = res.getId();
String href = res.getHref();