Examples with StreamObserver nu.validator.io.StreamObserver used on opensource projects

Example 1 with StreamObserver

use of nu.validator.io.StreamObserver in project validator by validator.

the class PrudentHttpEntityResolver method resolveEntity.

/**
 * @see org.xml.sax.EntityResolver#resolveEntity(java.lang.String,
 *      java.lang.String)
 */
@Override
public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException {
    if (requestsLeft > -1) {
        if (requestsLeft == 0) {
            throw new IOException("Number of permitted HTTP requests exceeded.");
        } else {
            requestsLeft--;
        }
    }
    HttpGet m = null;
    try {
        URL url = null;
        try {
            url = URL.parse(systemId);
        } catch (GalimatiasParseException e) {
            IOException ioe = (IOException) new IOException(e.getMessage()).initCause(e);
            SAXParseException spe = new SAXParseException(e.getMessage(), publicId, systemId, -1, -1, ioe);
            if (errorHandler != null) {
                errorHandler.fatalError(spe);
            }
            throw ioe;
        }
        String scheme = url.scheme();
        if (!("http".equals(scheme) || "https".equals(scheme))) {
            String msg = "Unsupported URI scheme: \u201C" + scheme + "\u201D.";
            SAXParseException spe = new SAXParseException(msg, publicId, systemId, -1, -1, new IOException(msg));
            if (errorHandler != null) {
                errorHandler.fatalError(spe);
            }
            throw spe;
        }
        systemId = url.toString();
        try {
            m = new HttpGet(systemId);
        } catch (IllegalArgumentException e) {
            SAXParseException spe = new SAXParseException(e.getMessage(), publicId, systemId, -1, -1, (IOException) new IOException(e.getMessage()).initCause(e));
            if (errorHandler != null) {
                errorHandler.fatalError(spe);
            }
            throw spe;
        }
        m.setHeader("User-Agent", userAgent);
        m.setHeader("Accept", buildAccept());
        m.setHeader("Accept-Encoding", "gzip");
        if (request != null && request.getAttribute("http://validator.nu/properties/accept-language") != null) {
            m.setHeader("Accept-Language", (String) request.getAttribute("http://validator.nu/properties/accept-language"));
        }
        log4j.info(systemId);
        try {
            if (url.port() > 65535) {
                throw new IOException("Port number must be less than 65536.");
            }
        } catch (NumberFormatException e) {
            throw new IOException("Port number must be less than 65536.");
        }
        HttpResponse response = client.execute(m);
        boolean ignoreResponseStatus = false;
        if (request != null && request.getAttribute("http://validator.nu/properties/ignore-response-status") != null) {
            ignoreResponseStatus = (boolean) request.getAttribute("http://validator.nu/properties/ignore-response-status");
        }
        int statusCode = response.getStatusLine().getStatusCode();
        if (statusCode != 200 && !ignoreResponseStatus) {
            String msg = "HTTP resource not retrievable." + " The HTTP status from the remote server was: " + statusCode + ".";
            SAXParseException spe = new SAXParseException(msg, publicId, m.getURI().toString(), -1, -1, new SystemIdIOException(m.getURI().toString(), msg));
            if (errorHandler != null) {
                errorHandler.fatalError(spe);
            }
            throw new ResourceNotRetrievableException(String.format("%s: %s", m.getURI().toString(), msg));
        }
        HttpEntity entity = response.getEntity();
        long len = entity.getContentLength();
        if (sizeLimit > -1 && len > sizeLimit) {
            SAXParseException spe = new SAXParseException("Resource size exceeds limit.", publicId, m.getURI().toString(), -1, -1, new StreamBoundException("Resource size exceeds limit."));
            if (errorHandler != null) {
                errorHandler.fatalError(spe);
            }
            throw spe;
        }
        TypedInputSource is;
        org.apache.http.Header ct = response.getFirstHeader("Content-Type");
        String contentType = null;
        final String baseUri = m.getURI().toString();
        if (ct != null) {
            contentType = ct.getValue();
        }
        is = contentTypeParser.buildTypedInputSource(baseUri, publicId, contentType);
        Header cl = response.getFirstHeader("Content-Language");
        if (cl != null) {
            is.setLanguage(cl.getValue().trim());
        }
        Header xuac = response.getFirstHeader("X-UA-Compatible");
        if (xuac != null) {
            String val = xuac.getValue().trim();
            if (!"ie=edge".equalsIgnoreCase(val)) {
                SAXParseException spe = new SAXParseException("X-UA-Compatible HTTP header must have the value \u201CIE=edge\u201D," + " was \u201C" + val + "\u201D.", publicId, systemId, -1, -1);
                errorHandler.error(spe);
            }
        }
        Header csp = response.getFirstHeader("Content-Security-Policy");
        if (csp != null) {
            try {
                ContentSecurityPolicy.THE_INSTANCE.checkValid(csp.getValue().trim());
            } catch (DatatypeException e) {
                SAXParseException spe = new SAXParseException("Content-Security-Policy HTTP header: " + e.getMessage(), publicId, systemId, -1, -1);
                Html5DatatypeException ex5 = (Html5DatatypeException) e;
                if (ex5.isWarning()) {
                    errorHandler.warning(spe);
                } else {
                    errorHandler.error(spe);
                }
            }
        }
        final HttpGet meth = m;
        InputStream stream = entity.getContent();
        if (sizeLimit > -1) {
            stream = new BoundedInputStream(stream, sizeLimit, baseUri);
        }
        Header ce = response.getFirstHeader("Content-Encoding");
        if (ce != null) {
            String val = ce.getValue().trim();
            if ("gzip".equalsIgnoreCase(val) || "x-gzip".equalsIgnoreCase(val)) {
                stream = new GZIPInputStream(stream);
                if (sizeLimit > -1) {
                    stream = new BoundedInputStream(stream, sizeLimit, baseUri);
                }
            }
        }
        is.setByteStream(new ObservableInputStream(stream, new StreamObserver() {

            private final Logger log4j = Logger.getLogger("nu.validator.xml.PrudentEntityResolver.StreamObserver");

            private boolean released = false;

            @Override
            public void closeCalled() {
                log4j.debug("closeCalled");
                if (!released) {
                    log4j.debug("closeCalled, not yet released");
                    released = true;
                    try {
                        meth.releaseConnection();
                    } catch (Exception e) {
                        log4j.debug("closeCalled, releaseConnection", e);
                    }
                }
            }

            @Override
            public void exceptionOccurred(Exception ex) throws IOException {
                if (!released) {
                    released = true;
                    try {
                        meth.abort();
                    } catch (Exception e) {
                        log4j.debug("exceptionOccurred, abort", e);
                    } finally {
                        try {
                            meth.releaseConnection();
                        } catch (Exception e) {
                            log4j.debug("exceptionOccurred, releaseConnection", e);
                        }
                    }
                }
                if (ex instanceof SystemIdIOException) {
                    throw (SystemIdIOException) ex;
                } else if (ex instanceof IOException) {
                    IOException ioe = (IOException) ex;
                    throw new SystemIdIOException(baseUri, ioe.getMessage(), ioe);
                } else if (ex instanceof RuntimeException) {
                    throw (RuntimeException) ex;
                } else {
                    throw new RuntimeException("API contract violation. Wrong exception type.", ex);
                }
            }

            @Override
            public void finalizerCalled() {
                if (!released) {
                    released = true;
                    try {
                        meth.abort();
                    } catch (Exception e) {
                        log4j.debug("finalizerCalled, abort", e);
                    } finally {
                        try {
                            meth.releaseConnection();
                        } catch (Exception e) {
                            log4j.debug("finalizerCalled, releaseConnection", e);
                        }
                    }
                }
            }
        }));
        return is;
    } catch (IOException | RuntimeException | SAXException e) {
        if (m != null) {
            try {
                m.abort();
            } catch (Exception ex) {
                log4j.debug("abort", ex);
            } finally {
                try {
                    m.releaseConnection();
                } catch (Exception ex) {
                    log4j.debug("releaseConnection", ex);
                }
            }
        }
        throw e;
    }
}