# HG changeset patch
# User Samuel Behan <dob-devel@dob.sk>
# Date 1565880799 -7200
# Thu Aug 15 16:53:19 2019 +0200
# Node ID bd497930fa90aee4a5c3d90917c6706fe93b73be
# Parent d30b1a99fcd053def84517d47654767548c827c9
xslt: return http status code from XSLT via variable

This patch introduces possibility to modify http status code of the response using
xslt variable named HTTP_STATUS_CODE. This is usefull ie. when processing results
from some search engine (SOLR in my case) and when 0 matching results has been found
the page is able to return 'hard' 404 response.

Example usage:

<xsl:variable name="HTTP_STATUS_CODE" select="404"/>

diff -r d30b1a99fcd0 -r bd497930fa90 src/http/modules/ngx_http_xslt_filter_module.c
--- a/src/http/modules/ngx_http_xslt_filter_module.c Tue Aug 13 15:45:57 2019 +0300
+++ b/src/http/modules/ngx_http_xslt_filter_module.c Thu Aug 15 16:53:19 2019 +0200
@@ -491,9 +491,11 @@
int len, rc, doc_type;
u_char *type, *encoding;
ngx_buf_t *b;
+ ngx_int_t status;
ngx_uint_t i;
- xmlChar *buf;
+ xmlChar *buf, *status_str;
xmlDocPtr doc, res;
+ xmlXPathObjectPtr obj;
ngx_http_xslt_sheet_t *sheet;
ngx_http_xslt_filter_loc_conf_t *conf;

@@ -536,6 +538,31 @@
ctx->params.elts, NULL, NULL,
ctx->transform);

+ obj = xsltVariableLookup(ctx->transform,
+ (const xmlChar *) "HTTP_STATUS_CODE",
+ NULL);
+ if (obj) {
+ status_str = xmlXPathCastToString(obj);
+ xmlXPathFreeObject(obj);
+
+ if (status_str) {
+ status = strtol((const char *) status_str, NULL, 10);
+ xmlFree(status_str);
+
+ if (status <= 99
+ || status >= 1000)
+ {
+ ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
+ "xslt response var HTTP_STATUS_CODE value invalid");
+ return NULL;
+
+ } else if (r->headers_out.status != (ngx_uint_t) status) {
+ r->headers_out.status = (ngx_uint_t) status;
+ r->headers_out.status_line.len = 0;
+ }
+ }
+ }
+
xsltFreeTransformContext(ctx->transform);
xmlFreeDoc(doc);

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