Example usage for com.google.common.hash HashingOutputStream hash

Introduction

In this page you can find the example usage for com.google.common.hash HashingOutputStream hash.

Prototype

@CheckReturnValue
public HashCode hash() 

Source Link

Document

Returns the HashCode based on the data written to this stream.

Usage

From source file:com.google.api.services.samples.storage.cmdline.StorageSample.java

public static void main(String[] args) {
    try {/*ww  w .j av  a 2 s.  co  m*/
        // initialize network, sample settings, credentials, and the storage client.
        HttpTransport httpTransport = GoogleNetHttpTransport.newTrustedTransport();
        JsonFactory jsonFactory = JacksonFactory.getDefaultInstance();
        SampleSettings settings = SampleSettings.load(jsonFactory);
        Credential credential = CredentialsProvider.authorize(httpTransport, jsonFactory);
        Storage storage = new Storage.Builder(httpTransport, jsonFactory, credential)
                .setApplicationName(APPLICATION_NAME).build();

        //
        // run commands
        //
        View.header1("Trying to create a new bucket " + settings.getBucket());
        BucketsInsertExample.createInProject(storage, settings.getProject(),
                new Bucket().setName(settings.getBucket()).setLocation("US"));

        View.header1("Getting bucket " + settings.getBucket() + " metadata");
        Bucket bucket = BucketsGetExample.get(storage, settings.getBucket());
        View.show(bucket);

        View.header1("Listing objects in bucket " + settings.getBucket());
        for (StorageObject object : ObjectsListExample.list(storage, settings.getBucket())) {
            View.show(object);
        }

        View.header1("Getting object metadata from gs://pub/SomeOfTheTeam.jpg");
        StorageObject object = ObjectsGetMetadataExample.get(storage, "pub", "SomeOfTheTeam.jpg");
        View.show(object);

        View.header1("Uploading object.");
        final long objectSize = 100 * 1024 * 1024 /* 100 MB */;
        InputStream data = new Helpers.RandomDataBlockInputStream(objectSize, 1024);
        object = new StorageObject().setBucket(settings.getBucket()).setName(settings.getPrefix() + "myobject")
                .setMetadata(ImmutableMap.of("key1", "value1", "key2", "value2"))
                .setCacheControl("max-age=3600, must-revalidate").setContentDisposition("attachment");
        object = ObjectsUploadExample.uploadWithMetadata(storage, object, data);
        View.show(object);
        System.out.println("md5Hash: " + object.getMd5Hash());
        System.out.println("crc32c: " + object.getCrc32c() + ", decoded to "
                + ByteBuffer.wrap(BaseEncoding.base64().decode(object.getCrc32c())).getInt());

        View.header1("Getting object data of uploaded object, calculate hashes/crcs.");
        OutputStream nullOutputStream = new OutputStream() {
            // Throws away the bytes.
            @Override
            public void write(int b) throws IOException {
            }

            @Override
            public void write(byte b[], int off, int len) {
            }
        };
        DigestOutputStream md5DigestOutputStream = new DigestOutputStream(nullOutputStream,
                MessageDigest.getInstance("MD5"));
        HashingOutputStream crc32cHashingOutputStream = new HashingOutputStream(Hashing.crc32c(),
                md5DigestOutputStream);
        ObjectsDownloadExample.downloadToOutputStream(storage, settings.getBucket(),
                settings.getPrefix() + "myobject", crc32cHashingOutputStream);
        String calculatedMD5 = BaseEncoding.base64().encode(md5DigestOutputStream.getMessageDigest().digest());
        System.out.println(
                "md5Hash: " + calculatedMD5 + " " + (object.getMd5Hash().equals(calculatedMD5) ? "(MATCHES)"
                        : "(MISMATCHES; data altered in transit)"));
        int calculatedCrc32c = crc32cHashingOutputStream.hash().asInt();
        String calculatedEncodedCrc32c = BaseEncoding.base64().encode(Ints.toByteArray(calculatedCrc32c));
        // NOTE: Don't compare HashCode.asBytes() directly, as that encodes the crc32c in
        // little-endien. One would have to reverse the bytes first.
        System.out.println("crc32c: " + calculatedEncodedCrc32c + ", decoded to "
                + crc32cHashingOutputStream.hash().asInt() + " "
                + (object.getCrc32c().equals(calculatedEncodedCrc32c) ? "(MATCHES)"
                        : "(MISMATCHES; data altered in transit)"));

        // success!
        return;
    } catch (GoogleJsonResponseException e) {
        // An error came back from the API.
        GoogleJsonError error = e.getDetails();
        System.err.println(error.getMessage());
        // More error information can be retrieved with error.getErrors().
    } catch (HttpResponseException e) {
        // No JSON body was returned by the API.
        System.err.println(e.getHeaders());
        System.err.println(e.getMessage());
    } catch (IOException e) {
        // Error formulating a HTTP request or reaching the HTTP service.
        System.err.println(e.getMessage());
    } catch (Throwable t) {
        t.printStackTrace();
    }
    System.exit(1);
}

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From source file:uk.ac.horizon.artcodes.server.christmas.ImageServlet.java

@Override
public void doPut(HttpServletRequest request, HttpServletResponse response) throws IOException {
    try {/* w ww .ja  v a 2  s .c  o m*/
        if (request.getContentLength() > image_size) {
            throw new HTTPException(HttpServletResponse.SC_REQUEST_ENTITY_TOO_LARGE, "Image too large");
        }

        verifyApp(request);
        final String id = getImageID(request);
        final GcsService gcsService = GcsServiceFactory.createGcsService(RetryParams.getDefaultInstance());
        final GcsFilename filename = new GcsFilename(request.getServerName(), id);

        final GcsFileMetadata metadata = gcsService.getMetadata(filename);
        if (metadata != null) {
            throw new HTTPException(HttpServletResponse.SC_FORBIDDEN, "Cannot modify");
        }

        final BufferedInputStream inputStream = new BufferedInputStream(request.getInputStream());
        final String mimetype = URLConnection.guessContentTypeFromStream(inputStream);
        if (mimetype == null) {
            throw new HTTPException(HttpServletResponse.SC_BAD_REQUEST, "Unrecognised image type");
        }

        final GcsFileOptions.Builder fileOptionsBuilder = new GcsFileOptions.Builder();
        fileOptionsBuilder.mimeType(mimetype);
        final GcsFileOptions fileOptions = fileOptionsBuilder.build();
        final GcsOutputChannel outputChannel = gcsService.createOrReplace(filename, fileOptions);

        final HashingOutputStream outputStream = new HashingOutputStream(Hashing.sha256(),
                Channels.newOutputStream(outputChannel));
        ByteStreams.copy(inputStream, outputStream);

        String hash = outputStream.hash().toString();
        if (!hash.equals(id)) {
            gcsService.delete(filename);
            throw new HTTPException(HttpServletResponse.SC_BAD_REQUEST, "Invalid hash");
        }

        outputStream.close();
        outputChannel.close();
    } catch (HTTPException e) {
        e.writeTo(response);
    }
}

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From source file:uk.ac.horizon.artcodes.server.ImageServlet.java

@Override
public void doPut(HttpServletRequest request, HttpServletResponse response) throws IOException {
    try {// www  .java 2s.com
        if (request.getContentLength() > image_size) {
            throw new HTTPException(HttpServletResponse.SC_REQUEST_ENTITY_TOO_LARGE, "Image too large");
        }

        verifyUser(getUser(request));
        final String id = getImageID(request);
        final GcsService gcsService = GcsServiceFactory.createGcsService(RetryParams.getDefaultInstance());
        final GcsFilename filename = new GcsFilename(request.getServerName(), id);

        final GcsFileMetadata metadata = gcsService.getMetadata(filename);
        if (metadata != null) {
            throw new HTTPException(HttpServletResponse.SC_FORBIDDEN, "Cannot modify");
        }

        final BufferedInputStream inputStream = new BufferedInputStream(request.getInputStream());
        final String mimetype = URLConnection.guessContentTypeFromStream(inputStream);
        if (mimetype == null) {
            throw new HTTPException(HttpServletResponse.SC_BAD_REQUEST, "Unrecognised image type");
        }

        final GcsFileOptions.Builder fileOptionsBuilder = new GcsFileOptions.Builder();
        fileOptionsBuilder.mimeType(mimetype);
        final GcsFileOptions fileOptions = fileOptionsBuilder.build();
        final GcsOutputChannel outputChannel = gcsService.createOrReplace(filename, fileOptions);

        final HashingOutputStream outputStream = new HashingOutputStream(Hashing.sha256(),
                Channels.newOutputStream(outputChannel));
        ByteStreams.copy(inputStream, outputStream);

        String hash = outputStream.hash().toString();
        if (!hash.equals(id)) {
            gcsService.delete(filename);
            throw new HTTPException(HttpServletResponse.SC_BAD_REQUEST, "Invalid hash");
        }

        outputStream.close();
        outputChannel.close();
    } catch (HTTPException e) {
        e.writeTo(response);
    }
}

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From source file:com.google.devtools.build.lib.collect.nestedset.NestedSetCodec.java

private void serializeOneNestedSet(Object children, CodedOutputStream codedOut,
        Map<Object, byte[]> childToDigest) throws IOException, SerializationException {
    // Serialize nested set into an inner byte array so we can take its digest
    ByteArrayOutputStream childOutputStream = new ByteArrayOutputStream();
    HashingOutputStream hashingOutputStream = new HashingOutputStream(Hashing.md5(), childOutputStream);
    CodedOutputStream childCodedOut = CodedOutputStream.newInstance(hashingOutputStream);
    if (children instanceof Object[]) {
        serializeMultiItemChildArray((Object[]) children, childToDigest, childCodedOut);
    } else if (children != NestedSet.EMPTY_CHILDREN) {
        serializeSingleItemChildArray(children, childCodedOut);
    } else {/*from   w  ww.  j a va  2 s.  c om*/
        // Empty set
        childCodedOut.writeInt32NoTag(0);
    }
    childCodedOut.flush();
    byte[] digest = hashingOutputStream.hash().asBytes();
    codedOut.writeByteArrayNoTag(digest);
    byte[] childBytes = childOutputStream.toByteArray();
    codedOut.writeByteArrayNoTag(childBytes);
    childToDigest.put(children, digest);
}

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From source file:io.macgyver.plugin.cmdb.AppInstanceManager.java

public String computeSignature(ObjectNode n, Set<String> exclusions) {
    List<String> list = Lists.newArrayList(n.fieldNames());
    Collections.sort(list);//from w  ww . ja v  a2s.c  om

    HashingOutputStream hos = new HashingOutputStream(Hashing.sha1(), ByteStreams.nullOutputStream());

    list.forEach(it -> {

        if (exclusions != null && !exclusions.contains(it)) {
            JsonNode val = n.get(it);
            if (val.isObject() || val.isArray()) {
                // skipping
            } else {
                try {
                    hos.write(it.getBytes());
                    hos.write(val.toString().getBytes());
                } catch (IOException e) {
                }
            }
        }
    });

    return hos.hash().toString();

}

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