XSL FO get image from server - spring

Question

Im using FOP version 2.1. I have a xsl fo template where i want to show images:
<xsl:variable name="ImagePath" select="defaultImageUrl"/>
<fo:external-graphic src="{$ImagePath}" content-width="scale-down-to-fit" width="100%"/>
Some images have a webadress like so:
https://upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Tulipa_biflora_UME.jpg/800px-Tulipa_biflora_UME.jpg
But other images come from my webserver from address like:
https://localhost:4200/api/download/image/?fixedPrice=true&productId=1329&fileId=1304
This responds to endpoint:
public ResponseEntity<byte[]> getFileAsResponseEntity(#RequestParam boolean fixedPrice, #RequestParam long productId, #RequestParam long fileId) throws IOException, SQLException {
HttpHeaders headers = new HttpHeaders();
FileDownload fileDownload = productService.getProductFile(productId, fileId, fixedPrice);
headers.setCacheControl(CacheControl.noCache().getHeaderValue());
String n = fileDownload.getFileName().toLowerCase();
if (fileDownload.getFileTypeEnum().equals(FileTypeEnum.PICTURE) && (n.contains(".jpeg") || n.contains("jpg"))) {
headers.setContentType(MediaType.IMAGE_JPEG);
} else if (fileDownload.getFileTypeEnum().equals(FileTypeEnum.PICTURE) && (n.contains(".png"))) {
headers.setContentType(MediaType.IMAGE_PNG);
} else if (fileDownload.getFileTypeEnum().equals(FileTypeEnum.PICTURE) && (n.contains(".gif"))) {
headers.setContentType(MediaType.IMAGE_GIF);
}
return new ResponseEntity<>(fileDownload.getByteArray(), headers, HttpStatus.OK);
}
Is there a way for fo:external-graphic to accept these 2 different urls? Or is there something additional i need to do for it to work, since currently when the image comes from the webserver, the the resulting pdf file does not have the image in it, only a white space.
EDIT:
Here is the code that should make the XML to XSL to PDF:
byte[] xsl = IOUtils.toByteArray(this.getClass().getResourceAsStream("/browserDocument.xsl"));
byte[] xml = getBrowserDocument(filter, clientId, representId, ecatMain, showImage, language);
InputStream inStr = this.getClass().getResourceAsStream("/fop.xml");
FopFactory fopFactory = FopFactory.newInstance(new java.net.URI("."), inStr);
ByteArrayOutputStream out = new ByteArrayOutputStream();
Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, out);
javax.xml.transform.Source xsltSrc = new StreamSource(new ByteArrayInputStream(xsl));
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer(xsltSrc);
String xmlStr = new String(xml, "UTF-8");
xmlStr = xmlStr.replaceAll("<", "<");
xmlStr = xmlStr.replaceAll(">", ">");
javax.xml.transform.Source src = new StreamSource(new ByteArrayInputStream(xmlStr.getBytes("UTF-8")));
Result res = new SAXResult(fop.getDefaultHandler());
transformer.transform(src, res);
return out.toByteArray();
I keep getting error message in the log files:
2019-01-30 16:07:48.300 ERROR 8424 --- [https-jsse-nio-8087-exec-3] org.apache.fop.apps.FOUserAgent : Image not found. URI: https://localhost:4200/api/efront/secure/download/product/image/?fixedPrice=false&productId=2823&fileId=1756. (No context info available)
It seems like it is calling the URL, but it is not getting the actual image from it. Maybe some issue with the image headers or the FOUseragent is getting blocked?

Answer 1

Well, implementing all above possible logic and seeing your code, I think URIResolver would help getting out of this as below:
Add it to your code : fopFactory.setURIResolver(new ResolveURIForWebServer());
import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.URIResolver;
public class ResolveURIForWebServer implements URIResolver {
#Override
public Source resolve(String href, String baseURI) throws TransformerException {
Source source = null;
try {
// CONVERT IMAGE TO INPUTSTREAM
source = new StreamSource(InputStream);
} catch (Exception e) {
} finally {
}
return source;
}
}
Hope it helps.