Examples with HeaderElements org.apache.hc.core5.http.HeaderElements used on opensource projects

Example 1 with HeaderElements

use of org.apache.hc.core5.http.HeaderElements in project californium by eclipse.

the class CrossProtocolTranslator method getCoapOptions.

/**
 * Gets the coap options starting from an array of http headers.
 *
 * The content-type is not handled by this method. The method iterates over
 * an array of headers and for each of them tries to find a mapping in the
 * properties file, if the mapping does not exists it skips the header
 * ignoring it. The method handles separately certain headers which are
 * translated to options (such as accept or cache-control) whose content
 * should be semantically checked or requires ad-hoc translation. Otherwise,
 * the headers content is translated with the appropriate format required by
 * the mapped option.
 *
 * @param headers array of http headers
 * @param etagTranslator translator for etag
 * @return list of CoAP options.
 * @throws NullPointerException if headers is {@code null}
 */
public List<Option> getCoapOptions(Header[] headers, EtagTranslator etagTranslator) {
    if (headers == null) {
        throw new NullPointerException("http header must not be null!");
    }
    Option accept = null;
    float acceptQualifier = 0.0F;
    List<Option> optionList = new LinkedList<Option>();
    // iterate over the headers
    for (Header header : headers) {
        try {
            String headerName = header.getName().toLowerCase();
            // get the mapping from the property file
            Integer coapOption = translationMapping.getCoapOption(headerName);
            // ignore the header if not found in the properties file
            if (coapOption == null) {
                continue;
            }
            int optionNumber = coapOption;
            // payload
            if (optionNumber == OptionNumberRegistry.CONTENT_FORMAT) {
                continue;
            }
            // get the value of the current header
            String headerValue = header.getValue().trim();
            // values
            if (optionNumber == OptionNumberRegistry.ACCEPT) {
                final ParserCursor cursor = new ParserCursor(0, headerValue.length());
                HeaderElement[] headerElements = parser.parseElements(headerValue, cursor);
                for (HeaderElement element : headerElements) {
                    float qualifier = 1.0F;
                    String mimeType = element.getName();
                    NameValuePair q = element.getParameterByName("q");
                    if (q != null) {
                        try {
                            qualifier = Float.parseFloat(q.getValue());
                        } catch (NumberFormatException ex) {
                        }
                    }
                    if (accept == null || acceptQualifier < qualifier) {
                        int coapContentType = MediaTypeRegistry.UNDEFINED;
                        String headerFragment = mimeType.trim();
                        if (headerFragment.contains("*")) {
                            int[] coapContentTypes = MediaTypeRegistry.parseWildcard(headerFragment);
                            if (coapContentTypes.length > 0) {
                                coapContentType = coapContentTypes[0];
                            }
                        } else {
                            coapContentType = getCoapMediaType(headerFragment, MediaTypeRegistry.UNDEFINED);
                        }
                        if (coapContentType != MediaTypeRegistry.UNDEFINED) {
                            accept = new Option(optionNumber, coapContentType);
                            acceptQualifier = qualifier;
                        }
                    }
                }
            } else if (optionNumber == OptionNumberRegistry.MAX_AGE) {
                int maxAge = -1;
                final ParserCursor cursor = new ParserCursor(0, headerValue.length());
                HeaderElement[] headerElements = parser.parseElements(headerValue, cursor);
                for (HeaderElement element : headerElements) {
                    if (element.getName().equalsIgnoreCase("no-cache")) {
                        maxAge = 0;
                        break;
                    } else if (element.getName().equalsIgnoreCase("max-age")) {
                        String value = element.getValue();
                        try {
                            maxAge = Integer.parseInt(value);
                            break;
                        } catch (NumberFormatException e) {
                            LOGGER.debug("Cannot convert cache control '{}' in max-age option", value, e);
                        }
                    }
                }
                if (maxAge >= 0) {
                    // create the option
                    Option option = new Option(optionNumber, maxAge);
                    optionList.add(option);
                }
            } else if (optionNumber == OptionNumberRegistry.ETAG) {
                byte[] etag = etagTranslator.getCoapEtag(headerValue);
                Option option = new Option(optionNumber, etag);
                optionList.add(option);
            } else if (optionNumber == OptionNumberRegistry.IF_MATCH) {
                byte[] etag = etagTranslator.getCoapEtag(headerValue);
                Option option = new Option(optionNumber, etag);
                optionList.add(option);
            } else if (optionNumber == OptionNumberRegistry.IF_NONE_MATCH) {
                if (headerValue.equals("*")) {
                    Option option = new Option(optionNumber, Bytes.EMPTY);
                    optionList.add(option);
                } else {
                    LOGGER.debug("'if-none-match' with etag '{}' is not supported!", headerValue);
                }
            } else if (optionNumber == OptionNumberRegistry.LOCATION_PATH) {
                try {
                    URI uri = new URI(headerValue);
                    OptionSet set = new OptionSet();
                    String value = uri.getPath();
                    if (value != null) {
                        set.setLocationPath(value);
                    }
                    value = uri.getQuery();
                    if (value != null) {
                        set.setLocationQuery(value);
                    }
                    optionList.addAll(set.asSortedList());
                } catch (URISyntaxException e) {
                    LOGGER.debug("'content-location' with '{}' is not supported!", headerValue, e);
                } catch (IllegalArgumentException e) {
                    LOGGER.debug("'content-location' with '{}' is not supported!", headerValue, e);
                }
            } else {
                // create the option
                Option option = new Option(optionNumber);
                switch(OptionNumberRegistry.getFormatByNr(optionNumber)) {
                    case INTEGER:
                        option.setIntegerValue(Integer.parseInt(headerValue));
                        break;
                    case OPAQUE:
                        option.setValue(headerValue.getBytes(ISO_8859_1));
                        break;
                    case EMPTY:
                        option.setValue(Bytes.EMPTY);
                        break;
                    case STRING:
                    default:
                        option.setStringValue(headerValue);
                        break;
                }
                optionList.add(option);
            }
        } catch (RuntimeException e) {
            LOGGER.debug("Could not parse header line {}: {}", header, e.getMessage());
        }
    }
    if (accept != null) {
        optionList.add(accept);
    }
    return optionList;
}