Example usage for org.springframework.web.servlet.resource ResourceTransformerChain transform

Introduction

In this page you can find the example usage for org.springframework.web.servlet.resource ResourceTransformerChain transform.

Prototype

Resource transform(HttpServletRequest request, Resource resource) throws IOException;

Source Link

Document

Transform the given resource.

Usage

From source file:org.broadleafcommerce.common.web.resource.transformer.BroadleafCachingResourceTransformer.java

@Override
public Resource transform(HttpServletRequest request, Resource resource,
        ResourceTransformerChain transformerChain) throws IOException {
    if (resourceTransformerCachingEnabled) {
        return super.transform(request, resource, transformerChain);
    } else {/*from   www.ja v a2  s . com*/
        return transformerChain.transform(request, resource);
    }
}

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From source file:org.springframework.web.servlet.resource.AppCacheManifestTransfomer.java

@Override
public Resource transform(HttpServletRequest request, Resource resource,
        ResourceTransformerChain transformerChain) throws IOException {
    resource = transformerChain.transform(request, resource);

    String filename = resource.getFilename();
    if (!this.fileExtension.equals(StringUtils.getFilenameExtension(filename))) {
        return resource;
    }/*from w w w . j a va2  s .  com*/

    byte[] bytes = FileCopyUtils.copyToByteArray(resource.getInputStream());
    String content = new String(bytes, DEFAULT_CHARSET);

    if (!content.startsWith(MANIFEST_HEADER)) {
        if (logger.isTraceEnabled()) {
            logger.trace("AppCache manifest does not start with 'CACHE MANIFEST', skipping: " + resource);
        }
        return resource;
    }

    if (logger.isTraceEnabled()) {
        logger.trace("Transforming resource: " + resource);
    }

    StringWriter contentWriter = new StringWriter();
    HashBuilder hashBuilder = new HashBuilder(content.length());

    Scanner scanner = new Scanner(content);
    SectionTransformer currentTransformer = this.sectionTransformers.get(MANIFEST_HEADER);
    while (scanner.hasNextLine()) {
        String line = scanner.nextLine();
        if (this.sectionTransformers.containsKey(line.trim())) {
            currentTransformer = this.sectionTransformers.get(line.trim());
            contentWriter.write(line + "\n");
            hashBuilder.appendString(line);
        } else {
            contentWriter
                    .write(currentTransformer.transform(line, hashBuilder, resource, transformerChain) + "\n");
        }
    }

    String hash = hashBuilder.build();
    contentWriter.write("\n" + "# Hash: " + hash);
    if (logger.isTraceEnabled()) {
        logger.trace("AppCache file: [" + resource.getFilename() + "] Hash: [" + hash + "]");
    }

    return new TransformedResource(resource, contentWriter.toString().getBytes(DEFAULT_CHARSET));
}

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From source file:org.springframework.web.servlet.resource.AppCacheManifestTransformer.java

@Override
public Resource transform(HttpServletRequest request, Resource resource, ResourceTransformerChain chain)
        throws IOException {

    resource = chain.transform(request, resource);
    if (!this.fileExtension.equals(StringUtils.getFilenameExtension(resource.getFilename()))) {
        return resource;
    }//  w w w. ja va2s.  c  om

    byte[] bytes = FileCopyUtils.copyToByteArray(resource.getInputStream());
    String content = new String(bytes, DEFAULT_CHARSET);

    if (!content.startsWith(MANIFEST_HEADER)) {
        if (logger.isTraceEnabled()) {
            logger.trace("Manifest should start with 'CACHE MANIFEST', skip: " + resource);
        }
        return resource;
    }

    if (logger.isTraceEnabled()) {
        logger.trace("Transforming resource: " + resource);
    }

    Scanner scanner = new Scanner(content);
    LineInfo previous = null;
    LineAggregator aggregator = new LineAggregator(resource, content);

    while (scanner.hasNext()) {
        String line = scanner.nextLine();
        LineInfo current = new LineInfo(line, previous);
        LineOutput lineOutput = processLine(current, request, resource, chain);
        aggregator.add(lineOutput);
        previous = current;
    }

    return aggregator.createResource();
}

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From source file:org.springframework.web.servlet.resource.CachingResourceTransformer.java

@Override
public Resource transform(HttpServletRequest request, Resource resource,
        ResourceTransformerChain transformerChain) throws IOException {

    Resource transformed = this.cache.get(resource, Resource.class);
    if (transformed != null) {
        if (logger.isTraceEnabled()) {
            logger.trace("Found match: " + transformed);
        }//from   ww w.j  ava 2 s.c  o  m
        return transformed;
    }

    transformed = transformerChain.transform(request, resource);

    if (logger.isTraceEnabled()) {
        logger.trace("Putting transformed resource in cache: " + transformed);
    }
    this.cache.put(resource, transformed);

    return transformed;
}

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From source file:org.springframework.web.servlet.resource.CssLinkResourceTransformer.java

@Override
public Resource transform(HttpServletRequest request, Resource resource,
        ResourceTransformerChain transformerChain) throws IOException {

    resource = transformerChain.transform(request, resource);

    String filename = resource.getFilename();
    if (!"css".equals(StringUtils.getFilenameExtension(filename))
            || resource instanceof GzipResourceResolver.GzippedResource) {
        return resource;
    }/*from w w w. j av a 2  s.  c om*/

    if (logger.isTraceEnabled()) {
        logger.trace("Transforming resource: " + resource);
    }

    byte[] bytes = FileCopyUtils.copyToByteArray(resource.getInputStream());
    String content = new String(bytes, DEFAULT_CHARSET);

    SortedSet<ContentChunkInfo> links = new TreeSet<>();
    for (LinkParser parser : this.linkParsers) {
        parser.parse(content, links);
    }

    if (links.isEmpty()) {
        if (logger.isTraceEnabled()) {
            logger.trace("No links found.");
        }
        return resource;
    }

    int index = 0;
    StringWriter writer = new StringWriter();
    for (ContentChunkInfo linkContentChunkInfo : links) {
        writer.write(content.substring(index, linkContentChunkInfo.getStart()));
        String link = content.substring(linkContentChunkInfo.getStart(), linkContentChunkInfo.getEnd());
        String newLink = null;
        if (!hasScheme(link)) {
            String absolutePath = toAbsolutePath(link, request);
            newLink = resolveUrlPath(absolutePath, request, resource, transformerChain);
        }
        if (logger.isTraceEnabled()) {
            if (newLink != null && !newLink.equals(link)) {
                logger.trace("Link modified: " + newLink + " (original: " + link + ")");
            } else {
                logger.trace("Link not modified: " + link);
            }
        }
        writer.write(newLink != null ? newLink : link);
        index = linkContentChunkInfo.getEnd();
    }
    writer.write(content.substring(index));

    return new TransformedResource(resource, writer.toString().getBytes(DEFAULT_CHARSET));
}

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From source file:org.springframework.web.servlet.resource.ResourceHttpRequestHandler.java

@Nullable
protected Resource getResource(HttpServletRequest request) throws IOException {
    String path = (String) request.getAttribute(HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE);
    if (path == null) {
        throw new IllegalStateException("Required request attribute '"
                + HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE + "' is not set");
    }//from www  . ja  v a2  s. c  o m
    path = processPath(path);
    if (!StringUtils.hasText(path) || isInvalidPath(path)) {
        if (logger.isTraceEnabled()) {
            logger.trace("Ignoring invalid resource path [" + path + "]");
        }
        return null;
    }
    if (path.contains("%")) {
        try {
            // Use URLDecoder (vs UriUtils) to preserve potentially decoded UTF-8 chars
            if (isInvalidPath(URLDecoder.decode(path, "UTF-8"))) {
                if (logger.isTraceEnabled()) {
                    logger.trace("Ignoring invalid resource path with escape sequences [" + path + "].");
                }
                return null;
            }
        } catch (IllegalArgumentException ex) {
            // ignore
        }
    }
    ResourceResolverChain resolveChain = new DefaultResourceResolverChain(getResourceResolvers());
    Resource resource = resolveChain.resolveResource(request, path, getLocations());
    if (resource == null || getResourceTransformers().isEmpty()) {
        return resource;
    }
    ResourceTransformerChain transformChain = new DefaultResourceTransformerChain(resolveChain,
            getResourceTransformers());
    resource = transformChain.transform(request, resource);
    return resource;
}

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