Mercurial > hg > nginx
view src/http/modules/ngx_http_xslt_filter_module.c @ 7508:c30a20e06c21
Range filter: fixed duplicate last buffers.
In ngx_http_range_singlepart_body() special buffers where passed
unmodified, including ones after the end of the range. As such,
if the last buffer of a response was sent separately as a special
buffer, two buffers with b->last_buf set were present in the response.
In particular, this might result in a duplicate final chunk when using
chunked transfer encoding (normally range filter and chunked transfer
encoding are not used together, but this may happen if there are trailers
in the response). This also likely to cause problems in HTTP/2.
Fix is to skip all special buffers after we've sent the last part of
the range requested. These special buffers are not meaningful anyway,
since we set b->last_buf in the buffer with the last part of the range,
and everything is expected to be flushed due to it.
Additionally, ngx_http_next_body_filter() is now called even
if no buffers are to be passed to it. This ensures that various
write events are properly propagated through the filter chain. In
particular, this fixes test failures observed with the above change
and aio enabled.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Mon, 13 May 2019 22:44:49 +0300 |
parents | 595a3de03e91 |
children | 9a970c905045 |
line wrap: on
line source
/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> #include <libxml/parser.h> #include <libxml/tree.h> #include <libxslt/xslt.h> #include <libxslt/xsltInternals.h> #include <libxslt/transform.h> #include <libxslt/variables.h> #include <libxslt/xsltutils.h> #if (NGX_HAVE_EXSLT) #include <libexslt/exslt.h> #endif #ifndef NGX_HTTP_XSLT_REUSE_DTD #define NGX_HTTP_XSLT_REUSE_DTD 1 #endif typedef struct { u_char *name; void *data; } ngx_http_xslt_file_t; typedef struct { ngx_array_t dtd_files; /* ngx_http_xslt_file_t */ ngx_array_t sheet_files; /* ngx_http_xslt_file_t */ } ngx_http_xslt_filter_main_conf_t; typedef struct { u_char *name; ngx_http_complex_value_t value; ngx_uint_t quote; /* unsigned quote:1; */ } ngx_http_xslt_param_t; typedef struct { xsltStylesheetPtr stylesheet; ngx_array_t params; /* ngx_http_xslt_param_t */ } ngx_http_xslt_sheet_t; typedef struct { xmlDtdPtr dtd; ngx_array_t sheets; /* ngx_http_xslt_sheet_t */ ngx_hash_t types; ngx_array_t *types_keys; ngx_array_t *params; /* ngx_http_xslt_param_t */ ngx_flag_t last_modified; } ngx_http_xslt_filter_loc_conf_t; typedef struct { xmlDocPtr doc; xmlParserCtxtPtr ctxt; xsltTransformContextPtr transform; ngx_http_request_t *request; ngx_array_t params; ngx_uint_t done; /* unsigned done:1; */ } ngx_http_xslt_filter_ctx_t; static ngx_int_t ngx_http_xslt_send(ngx_http_request_t *r, ngx_http_xslt_filter_ctx_t *ctx, ngx_buf_t *b); static ngx_int_t ngx_http_xslt_add_chunk(ngx_http_request_t *r, ngx_http_xslt_filter_ctx_t *ctx, ngx_buf_t *b); static void ngx_http_xslt_sax_external_subset(void *data, const xmlChar *name, const xmlChar *externalId, const xmlChar *systemId); static void ngx_cdecl ngx_http_xslt_sax_error(void *data, const char *msg, ...); static ngx_buf_t *ngx_http_xslt_apply_stylesheet(ngx_http_request_t *r, ngx_http_xslt_filter_ctx_t *ctx); static ngx_int_t ngx_http_xslt_params(ngx_http_request_t *r, ngx_http_xslt_filter_ctx_t *ctx, ngx_array_t *params, ngx_uint_t final); static u_char *ngx_http_xslt_content_type(xsltStylesheetPtr s); static u_char *ngx_http_xslt_encoding(xsltStylesheetPtr s); static void ngx_http_xslt_cleanup(void *data); static char *ngx_http_xslt_entities(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static char *ngx_http_xslt_stylesheet(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static char *ngx_http_xslt_param(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static void ngx_http_xslt_cleanup_dtd(void *data); static void ngx_http_xslt_cleanup_stylesheet(void *data); static void *ngx_http_xslt_filter_create_main_conf(ngx_conf_t *cf); static void *ngx_http_xslt_filter_create_conf(ngx_conf_t *cf); static char *ngx_http_xslt_filter_merge_conf(ngx_conf_t *cf, void *parent, void *child); static ngx_int_t ngx_http_xslt_filter_preconfiguration(ngx_conf_t *cf); static ngx_int_t ngx_http_xslt_filter_init(ngx_conf_t *cf); static void ngx_http_xslt_filter_exit(ngx_cycle_t *cycle); static ngx_str_t ngx_http_xslt_default_types[] = { ngx_string("text/xml"), ngx_null_string }; static ngx_command_t ngx_http_xslt_filter_commands[] = { { ngx_string("xml_entities"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_http_xslt_entities, NGX_HTTP_LOC_CONF_OFFSET, 0, NULL }, { ngx_string("xslt_stylesheet"), NGX_HTTP_LOC_CONF|NGX_CONF_1MORE, ngx_http_xslt_stylesheet, NGX_HTTP_LOC_CONF_OFFSET, 0, NULL }, { ngx_string("xslt_param"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2, ngx_http_xslt_param, NGX_HTTP_LOC_CONF_OFFSET, 0, NULL }, { ngx_string("xslt_string_param"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2, ngx_http_xslt_param, NGX_HTTP_LOC_CONF_OFFSET, 0, (void *) 1 }, { ngx_string("xslt_types"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE, ngx_http_types_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_xslt_filter_loc_conf_t, types_keys), &ngx_http_xslt_default_types[0] }, { ngx_string("xslt_last_modified"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, ngx_conf_set_flag_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_xslt_filter_loc_conf_t, last_modified), NULL }, ngx_null_command }; static ngx_http_module_t ngx_http_xslt_filter_module_ctx = { ngx_http_xslt_filter_preconfiguration, /* preconfiguration */ ngx_http_xslt_filter_init, /* postconfiguration */ ngx_http_xslt_filter_create_main_conf, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ ngx_http_xslt_filter_create_conf, /* create location configuration */ ngx_http_xslt_filter_merge_conf /* merge location configuration */ }; ngx_module_t ngx_http_xslt_filter_module = { NGX_MODULE_V1, &ngx_http_xslt_filter_module_ctx, /* module context */ ngx_http_xslt_filter_commands, /* module directives */ NGX_HTTP_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ ngx_http_xslt_filter_exit, /* exit process */ ngx_http_xslt_filter_exit, /* exit master */ NGX_MODULE_V1_PADDING }; static ngx_http_output_header_filter_pt ngx_http_next_header_filter; static ngx_http_output_body_filter_pt ngx_http_next_body_filter; static ngx_int_t ngx_http_xslt_header_filter(ngx_http_request_t *r) { ngx_http_xslt_filter_ctx_t *ctx; ngx_http_xslt_filter_loc_conf_t *conf; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "xslt filter header"); if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED) { return ngx_http_next_header_filter(r); } conf = ngx_http_get_module_loc_conf(r, ngx_http_xslt_filter_module); if (conf->sheets.nelts == 0 || ngx_http_test_content_type(r, &conf->types) == NULL) { return ngx_http_next_header_filter(r); } ctx = ngx_http_get_module_ctx(r, ngx_http_xslt_filter_module); if (ctx) { return ngx_http_next_header_filter(r); } ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_xslt_filter_ctx_t)); if (ctx == NULL) { return NGX_ERROR; } ngx_http_set_ctx(r, ctx, ngx_http_xslt_filter_module); r->main_filter_need_in_memory = 1; return NGX_OK; } static ngx_int_t ngx_http_xslt_body_filter(ngx_http_request_t *r, ngx_chain_t *in) { int wellFormed; ngx_chain_t *cl; ngx_http_xslt_filter_ctx_t *ctx; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "xslt filter body"); if (in == NULL) { return ngx_http_next_body_filter(r, in); } ctx = ngx_http_get_module_ctx(r, ngx_http_xslt_filter_module); if (ctx == NULL || ctx->done) { return ngx_http_next_body_filter(r, in); } for (cl = in; cl; cl = cl->next) { if (ngx_http_xslt_add_chunk(r, ctx, cl->buf) != NGX_OK) { if (ctx->ctxt->myDoc) { #if (NGX_HTTP_XSLT_REUSE_DTD) ctx->ctxt->myDoc->extSubset = NULL; #endif xmlFreeDoc(ctx->ctxt->myDoc); } xmlFreeParserCtxt(ctx->ctxt); return ngx_http_xslt_send(r, ctx, NULL); } if (cl->buf->last_buf || cl->buf->last_in_chain) { ctx->doc = ctx->ctxt->myDoc; #if (NGX_HTTP_XSLT_REUSE_DTD) ctx->doc->extSubset = NULL; #endif wellFormed = ctx->ctxt->wellFormed; xmlFreeParserCtxt(ctx->ctxt); if (wellFormed) { return ngx_http_xslt_send(r, ctx, ngx_http_xslt_apply_stylesheet(r, ctx)); } xmlFreeDoc(ctx->doc); ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "not well formed XML document"); return ngx_http_xslt_send(r, ctx, NULL); } } return NGX_OK; } static ngx_int_t ngx_http_xslt_send(ngx_http_request_t *r, ngx_http_xslt_filter_ctx_t *ctx, ngx_buf_t *b) { ngx_int_t rc; ngx_chain_t out; ngx_pool_cleanup_t *cln; ngx_http_xslt_filter_loc_conf_t *conf; ctx->done = 1; if (b == NULL) { return ngx_http_filter_finalize_request(r, &ngx_http_xslt_filter_module, NGX_HTTP_INTERNAL_SERVER_ERROR); } cln = ngx_pool_cleanup_add(r->pool, 0); if (cln == NULL) { ngx_free(b->pos); return ngx_http_filter_finalize_request(r, &ngx_http_xslt_filter_module, NGX_HTTP_INTERNAL_SERVER_ERROR); } if (r == r->main) { r->headers_out.content_length_n = b->last - b->pos; if (r->headers_out.content_length) { r->headers_out.content_length->hash = 0; r->headers_out.content_length = NULL; } conf = ngx_http_get_module_loc_conf(r, ngx_http_xslt_filter_module); if (!conf->last_modified) { ngx_http_clear_last_modified(r); ngx_http_clear_etag(r); } else { ngx_http_weak_etag(r); } } rc = ngx_http_next_header_filter(r); if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) { ngx_free(b->pos); return rc; } cln->handler = ngx_http_xslt_cleanup; cln->data = b->pos; out.buf = b; out.next = NULL; return ngx_http_next_body_filter(r, &out); } static ngx_int_t ngx_http_xslt_add_chunk(ngx_http_request_t *r, ngx_http_xslt_filter_ctx_t *ctx, ngx_buf_t *b) { int err; xmlParserCtxtPtr ctxt; if (ctx->ctxt == NULL) { ctxt = xmlCreatePushParserCtxt(NULL, NULL, NULL, 0, NULL); if (ctxt == NULL) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "xmlCreatePushParserCtxt() failed"); return NGX_ERROR; } xmlCtxtUseOptions(ctxt, XML_PARSE_NOENT|XML_PARSE_DTDLOAD |XML_PARSE_NOWARNING); ctxt->sax->externalSubset = ngx_http_xslt_sax_external_subset; ctxt->sax->setDocumentLocator = NULL; ctxt->sax->error = ngx_http_xslt_sax_error; ctxt->sax->fatalError = ngx_http_xslt_sax_error; ctxt->sax->_private = ctx; ctx->ctxt = ctxt; ctx->request = r; } err = xmlParseChunk(ctx->ctxt, (char *) b->pos, (int) (b->last - b->pos), (b->last_buf) || (b->last_in_chain)); if (err == 0) { b->pos = b->last; return NGX_OK; } ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "xmlParseChunk() failed, error:%d", err); return NGX_ERROR; } static void ngx_http_xslt_sax_external_subset(void *data, const xmlChar *name, const xmlChar *externalId, const xmlChar *systemId) { xmlParserCtxtPtr ctxt = data; xmlDocPtr doc; xmlDtdPtr dtd; ngx_http_request_t *r; ngx_http_xslt_filter_ctx_t *ctx; ngx_http_xslt_filter_loc_conf_t *conf; ctx = ctxt->sax->_private; r = ctx->request; conf = ngx_http_get_module_loc_conf(r, ngx_http_xslt_filter_module); ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "xslt filter extSubset: \"%s\" \"%s\" \"%s\"", name ? name : (xmlChar *) "", externalId ? externalId : (xmlChar *) "", systemId ? systemId : (xmlChar *) ""); doc = ctxt->myDoc; #if (NGX_HTTP_XSLT_REUSE_DTD) dtd = conf->dtd; #else dtd = xmlCopyDtd(conf->dtd); if (dtd == NULL) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "xmlCopyDtd() failed"); return; } if (doc->children == NULL) { xmlAddChild((xmlNodePtr) doc, (xmlNodePtr) dtd); } else { xmlAddPrevSibling(doc->children, (xmlNodePtr) dtd); } #endif doc->extSubset = dtd; } static void ngx_cdecl ngx_http_xslt_sax_error(void *data, const char *msg, ...) { xmlParserCtxtPtr ctxt = data; size_t n; va_list args; ngx_http_xslt_filter_ctx_t *ctx; u_char buf[NGX_MAX_ERROR_STR]; ctx = ctxt->sax->_private; buf[0] = '\0'; va_start(args, msg); n = (size_t) vsnprintf((char *) buf, NGX_MAX_ERROR_STR, msg, args); va_end(args); while (--n && (buf[n] == CR || buf[n] == LF)) { /* void */ } ngx_log_error(NGX_LOG_ERR, ctx->request->connection->log, 0, "libxml2 error: \"%*s\"", n + 1, buf); } static ngx_buf_t * ngx_http_xslt_apply_stylesheet(ngx_http_request_t *r, ngx_http_xslt_filter_ctx_t *ctx) { int len, rc, doc_type; u_char *type, *encoding; ngx_buf_t *b; ngx_uint_t i; xmlChar *buf; xmlDocPtr doc, res; ngx_http_xslt_sheet_t *sheet; ngx_http_xslt_filter_loc_conf_t *conf; conf = ngx_http_get_module_loc_conf(r, ngx_http_xslt_filter_module); sheet = conf->sheets.elts; doc = ctx->doc; /* preallocate array for 4 params */ if (ngx_array_init(&ctx->params, r->pool, 4 * 2 + 1, sizeof(char *)) != NGX_OK) { xmlFreeDoc(doc); return NULL; } for (i = 0; i < conf->sheets.nelts; i++) { ctx->transform = xsltNewTransformContext(sheet[i].stylesheet, doc); if (ctx->transform == NULL) { xmlFreeDoc(doc); return NULL; } if (conf->params && ngx_http_xslt_params(r, ctx, conf->params, 0) != NGX_OK) { xsltFreeTransformContext(ctx->transform); xmlFreeDoc(doc); return NULL; } if (ngx_http_xslt_params(r, ctx, &sheet[i].params, 1) != NGX_OK) { xsltFreeTransformContext(ctx->transform); xmlFreeDoc(doc); return NULL; } res = xsltApplyStylesheetUser(sheet[i].stylesheet, doc, ctx->params.elts, NULL, NULL, ctx->transform); xsltFreeTransformContext(ctx->transform); xmlFreeDoc(doc); if (res == NULL) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "xsltApplyStylesheet() failed"); return NULL; } doc = res; /* reset array elements */ ctx->params.nelts = 0; } /* there must be at least one stylesheet */ if (r == r->main) { type = ngx_http_xslt_content_type(sheet[i - 1].stylesheet); } else { type = NULL; } encoding = ngx_http_xslt_encoding(sheet[i - 1].stylesheet); doc_type = doc->type; ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "xslt filter type: %d t:%s e:%s", doc_type, type ? type : (u_char *) "(null)", encoding ? encoding : (u_char *) "(null)"); rc = xsltSaveResultToString(&buf, &len, doc, sheet[i - 1].stylesheet); xmlFreeDoc(doc); if (rc != 0) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "xsltSaveResultToString() failed"); return NULL; } if (len == 0) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "xsltSaveResultToString() returned zero-length result"); return NULL; } b = ngx_calloc_buf(r->pool); if (b == NULL) { ngx_free(buf); return NULL; } b->pos = buf; b->last = buf + len; b->memory = 1; if (encoding) { r->headers_out.charset.len = ngx_strlen(encoding); r->headers_out.charset.data = encoding; } if (r != r->main) { return b; } b->last_buf = 1; if (type) { len = ngx_strlen(type); r->headers_out.content_type_len = len; r->headers_out.content_type.len = len; r->headers_out.content_type.data = type; } else if (doc_type == XML_HTML_DOCUMENT_NODE) { r->headers_out.content_type_len = sizeof("text/html") - 1; ngx_str_set(&r->headers_out.content_type, "text/html"); } r->headers_out.content_type_lowcase = NULL; return b; } static ngx_int_t ngx_http_xslt_params(ngx_http_request_t *r, ngx_http_xslt_filter_ctx_t *ctx, ngx_array_t *params, ngx_uint_t final) { u_char *p, *last, *value, *dst, *src, **s; size_t len; ngx_uint_t i; ngx_str_t string; ngx_http_xslt_param_t *param; param = params->elts; for (i = 0; i < params->nelts; i++) { if (ngx_http_complex_value(r, ¶m[i].value, &string) != NGX_OK) { return NGX_ERROR; } ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "xslt filter param: \"%s\"", string.data); if (param[i].name) { ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "xslt filter param name: \"%s\"", param[i].name); if (param[i].quote) { if (xsltQuoteOneUserParam(ctx->transform, param[i].name, string.data) != 0) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "xsltQuoteOneUserParam(\"%s\", \"%s\") failed", param[i].name, string.data); return NGX_ERROR; } continue; } s = ngx_array_push(&ctx->params); if (s == NULL) { return NGX_ERROR; } *s = param[i].name; s = ngx_array_push(&ctx->params); if (s == NULL) { return NGX_ERROR; } *s = string.data; continue; } /* * parse param1=value1:param2=value2 syntax as used by parameters * specified in xslt_stylesheet directives */ if (param[i].value.lengths) { p = string.data; } else { p = ngx_pnalloc(r->pool, string.len + 1); if (p == NULL) { return NGX_ERROR; } ngx_memcpy(p, string.data, string.len + 1); } last = p + string.len; while (p && *p) { value = p; p = (u_char *) ngx_strchr(p, '='); if (p == NULL) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "invalid libxslt parameter \"%s\"", value); return NGX_ERROR; } *p++ = '\0'; ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "xslt filter param name: \"%s\"", value); s = ngx_array_push(&ctx->params); if (s == NULL) { return NGX_ERROR; } *s = value; value = p; p = (u_char *) ngx_strchr(p, ':'); if (p) { len = p - value; *p++ = '\0'; } else { len = last - value; } ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "xslt filter param value: \"%s\"", value); dst = value; src = value; ngx_unescape_uri(&dst, &src, len, 0); *dst = '\0'; ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "xslt filter param unescaped: \"%s\"", value); s = ngx_array_push(&ctx->params); if (s == NULL) { return NGX_ERROR; } *s = value; } } if (final) { s = ngx_array_push(&ctx->params); if (s == NULL) { return NGX_ERROR; } *s = NULL; } return NGX_OK; } static u_char * ngx_http_xslt_content_type(xsltStylesheetPtr s) { u_char *type; if (s->mediaType) { return s->mediaType; } for (s = s->imports; s; s = s->next) { type = ngx_http_xslt_content_type(s); if (type) { return type; } } return NULL; } static u_char * ngx_http_xslt_encoding(xsltStylesheetPtr s) { u_char *encoding; if (s->encoding) { return s->encoding; } for (s = s->imports; s; s = s->next) { encoding = ngx_http_xslt_encoding(s); if (encoding) { return encoding; } } return NULL; } static void ngx_http_xslt_cleanup(void *data) { ngx_free(data); } static char * ngx_http_xslt_entities(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_xslt_filter_loc_conf_t *xlcf = conf; ngx_str_t *value; ngx_uint_t i; ngx_pool_cleanup_t *cln; ngx_http_xslt_file_t *file; ngx_http_xslt_filter_main_conf_t *xmcf; if (xlcf->dtd) { return "is duplicate"; } value = cf->args->elts; xmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_xslt_filter_module); file = xmcf->dtd_files.elts; for (i = 0; i < xmcf->dtd_files.nelts; i++) { if (ngx_strcmp(file[i].name, value[1].data) == 0) { xlcf->dtd = file[i].data; return NGX_CONF_OK; } } cln = ngx_pool_cleanup_add(cf->pool, 0); if (cln == NULL) { return NGX_CONF_ERROR; } xlcf->dtd = xmlParseDTD(NULL, (xmlChar *) value[1].data); if (xlcf->dtd == NULL) { ngx_conf_log_error(NGX_LOG_ERR, cf, 0, "xmlParseDTD() failed"); return NGX_CONF_ERROR; } cln->handler = ngx_http_xslt_cleanup_dtd; cln->data = xlcf->dtd; file = ngx_array_push(&xmcf->dtd_files); if (file == NULL) { return NGX_CONF_ERROR; } file->name = value[1].data; file->data = xlcf->dtd; return NGX_CONF_OK; } static char * ngx_http_xslt_stylesheet(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_xslt_filter_loc_conf_t *xlcf = conf; ngx_str_t *value; ngx_uint_t i, n; ngx_pool_cleanup_t *cln; ngx_http_xslt_file_t *file; ngx_http_xslt_sheet_t *sheet; ngx_http_xslt_param_t *param; ngx_http_compile_complex_value_t ccv; ngx_http_xslt_filter_main_conf_t *xmcf; value = cf->args->elts; if (xlcf->sheets.elts == NULL) { if (ngx_array_init(&xlcf->sheets, cf->pool, 1, sizeof(ngx_http_xslt_sheet_t)) != NGX_OK) { return NGX_CONF_ERROR; } } sheet = ngx_array_push(&xlcf->sheets); if (sheet == NULL) { return NGX_CONF_ERROR; } ngx_memzero(sheet, sizeof(ngx_http_xslt_sheet_t)); if (ngx_conf_full_name(cf->cycle, &value[1], 0) != NGX_OK) { return NGX_CONF_ERROR; } xmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_xslt_filter_module); file = xmcf->sheet_files.elts; for (i = 0; i < xmcf->sheet_files.nelts; i++) { if (ngx_strcmp(file[i].name, value[1].data) == 0) { sheet->stylesheet = file[i].data; goto found; } } cln = ngx_pool_cleanup_add(cf->pool, 0); if (cln == NULL) { return NGX_CONF_ERROR; } sheet->stylesheet = xsltParseStylesheetFile(value[1].data); if (sheet->stylesheet == NULL) { ngx_conf_log_error(NGX_LOG_ERR, cf, 0, "xsltParseStylesheetFile(\"%s\") failed", value[1].data); return NGX_CONF_ERROR; } cln->handler = ngx_http_xslt_cleanup_stylesheet; cln->data = sheet->stylesheet; file = ngx_array_push(&xmcf->sheet_files); if (file == NULL) { return NGX_CONF_ERROR; } file->name = value[1].data; file->data = sheet->stylesheet; found: n = cf->args->nelts; if (n == 2) { return NGX_CONF_OK; } if (ngx_array_init(&sheet->params, cf->pool, n - 2, sizeof(ngx_http_xslt_param_t)) != NGX_OK) { return NGX_CONF_ERROR; } for (i = 2; i < n; i++) { param = ngx_array_push(&sheet->params); if (param == NULL) { return NGX_CONF_ERROR; } ngx_memzero(param, sizeof(ngx_http_xslt_param_t)); ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t)); ccv.cf = cf; ccv.value = &value[i]; ccv.complex_value = ¶m->value; ccv.zero = 1; if (ngx_http_compile_complex_value(&ccv) != NGX_OK) { return NGX_CONF_ERROR; } } return NGX_CONF_OK; } static char * ngx_http_xslt_param(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_xslt_filter_loc_conf_t *xlcf = conf; ngx_http_xslt_param_t *param; ngx_http_compile_complex_value_t ccv; ngx_str_t *value; value = cf->args->elts; if (xlcf->params == NULL) { xlcf->params = ngx_array_create(cf->pool, 2, sizeof(ngx_http_xslt_param_t)); if (xlcf->params == NULL) { return NGX_CONF_ERROR; } } param = ngx_array_push(xlcf->params); if (param == NULL) { return NGX_CONF_ERROR; } param->name = value[1].data; param->quote = (cmd->post == NULL) ? 0 : 1; ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t)); ccv.cf = cf; ccv.value = &value[2]; ccv.complex_value = ¶m->value; ccv.zero = 1; if (ngx_http_compile_complex_value(&ccv) != NGX_OK) { return NGX_CONF_ERROR; } return NGX_CONF_OK; } static void ngx_http_xslt_cleanup_dtd(void *data) { xmlFreeDtd(data); } static void ngx_http_xslt_cleanup_stylesheet(void *data) { xsltFreeStylesheet(data); } static void * ngx_http_xslt_filter_create_main_conf(ngx_conf_t *cf) { ngx_http_xslt_filter_main_conf_t *conf; conf = ngx_palloc(cf->pool, sizeof(ngx_http_xslt_filter_main_conf_t)); if (conf == NULL) { return NULL; } if (ngx_array_init(&conf->dtd_files, cf->pool, 1, sizeof(ngx_http_xslt_file_t)) != NGX_OK) { return NULL; } if (ngx_array_init(&conf->sheet_files, cf->pool, 1, sizeof(ngx_http_xslt_file_t)) != NGX_OK) { return NULL; } return conf; } static void * ngx_http_xslt_filter_create_conf(ngx_conf_t *cf) { ngx_http_xslt_filter_loc_conf_t *conf; conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_xslt_filter_loc_conf_t)); if (conf == NULL) { return NULL; } /* * set by ngx_pcalloc(): * * conf->dtd = NULL; * conf->sheets = { NULL }; * conf->types = { NULL }; * conf->types_keys = NULL; * conf->params = NULL; */ conf->last_modified = NGX_CONF_UNSET; return conf; } static char * ngx_http_xslt_filter_merge_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_http_xslt_filter_loc_conf_t *prev = parent; ngx_http_xslt_filter_loc_conf_t *conf = child; if (conf->dtd == NULL) { conf->dtd = prev->dtd; } if (conf->sheets.nelts == 0) { conf->sheets = prev->sheets; } if (conf->params == NULL) { conf->params = prev->params; } if (ngx_http_merge_types(cf, &conf->types_keys, &conf->types, &prev->types_keys, &prev->types, ngx_http_xslt_default_types) != NGX_OK) { return NGX_CONF_ERROR; } ngx_conf_merge_value(conf->last_modified, prev->last_modified, 0); return NGX_CONF_OK; } static ngx_int_t ngx_http_xslt_filter_preconfiguration(ngx_conf_t *cf) { xmlInitParser(); #if (NGX_HAVE_EXSLT) exsltRegisterAll(); #endif return NGX_OK; } static ngx_int_t ngx_http_xslt_filter_init(ngx_conf_t *cf) { ngx_http_next_header_filter = ngx_http_top_header_filter; ngx_http_top_header_filter = ngx_http_xslt_header_filter; ngx_http_next_body_filter = ngx_http_top_body_filter; ngx_http_top_body_filter = ngx_http_xslt_body_filter; return NGX_OK; } static void ngx_http_xslt_filter_exit(ngx_cycle_t *cycle) { xsltCleanupGlobals(); xmlCleanupParser(); }