/**
* Helper method for validating request.
*
* @param request HTTP request
* @param params parameters in a collection of Strings
*/
protected void validateParams(HttpAction action, Collection<String> params) {
HttpServletRequest request = action.request;
ContentType ct = FusekiLib.getContentType(request);
boolean mustHaveQueryParam = true;
if (ct != null) {
String incoming = ct.getContentType();
if (matchContentType(ctSPARQLQuery, ct)) {
mustHaveQueryParam = false;
// Drop through.
} else if (matchContentType(ctHTMLForm, ct)) {
// Nothing specific to do
} else ServletOps.error(HttpSC.UNSUPPORTED_MEDIA_TYPE_415, "Unsupported: " + incoming);
}
// GET/POST of a form at this point.
if (mustHaveQueryParam) {
int N = countParamOccurences(request, paramQuery);
if (N == 0) ServletOps.errorBadRequest("SPARQL Query: No 'query=' parameter");
if (N > 1) ServletOps.errorBadRequest("SPARQL Query: Multiple 'query=' parameters");
// application/sparql-query does not use a query param.
String queryStr = request.getParameter(HttpNames.paramQuery);
if (queryStr == null)
ServletOps.errorBadRequest("SPARQL Query: No query specified (no 'query=' found)");
if (queryStr.isEmpty()) ServletOps.errorBadRequest("SPARQL Query: Empty query string");
}
if (params != null) {
Enumeration<String> en = request.getParameterNames();
for (; en.hasMoreElements(); ) {
String name = en.nextElement();
if (!params.contains(name))
ServletOps.warning(
action, "SPARQL Query: Unrecognize request parameter (ignored): " + name);
}
}
}
/**
* Validate the request, checking HTTP method and HTTP Parameters.
*
* @param action HTTP Action
*/
@Override
protected void validate(HttpAction action) {
String method = action.request.getMethod().toUpperCase(Locale.ROOT);
if (HttpNames.METHOD_OPTIONS.equals(method)) return;
if (!HttpNames.METHOD_POST.equals(method) && !HttpNames.METHOD_GET.equals(method))
ServletOps.errorMethodNotAllowed("Not a GET or POST request");
if (HttpNames.METHOD_GET.equals(method) && action.request.getQueryString() == null) {
ServletOps.warning(
action, "Service Description / SPARQL Query / " + action.request.getRequestURI());
ServletOps.errorNotFound("Service Description: " + action.request.getRequestURI());
}
// Use of the dataset describing parameters is check later.
try {
validateParams(action, allParams);
validateRequest(action);
} catch (ActionErrorException ex) {
throw ex;
}
// Query not yet parsed.
}