Mercurial > hg > nginx
view src/http/modules/ngx_http_xslt_filter_module.c @ 8045:aa28c802409f
Resolver: make TCP write timer event cancelable.
Similar to 70e65bf8dfd7, the change is made to ensure that the ability to
cancel resolver tasks is fully controlled by the caller. As mentioned in the
referenced commit, it is safe to make this timer cancelable because resolve
tasks can have their own timeouts that are not cancelable.
The scenario where this may become a problem is a periodic background resolve
task (not tied to a specific request or a client connection), which receives a
response with short TTL, large enough to warrant fallback to a TCP query.
With each event loop wakeup, we either have a previously set write timer
instance or schedule a new one. The non-cancelable write timer can delay or
block graceful shutdown of a worker even if the ngx_resolver_ctx_t->cancelable
flag is set by the API user, and there are no other tasks or connections.
We use the resolver API in this way to maintain the list of upstream server
addresses specified with the 'resolve' parameter, and there could be third-party
modules implementing similar logic.
author | Aleksei Bavshin <a.bavshin@f5.com> |
---|---|
date | Wed, 01 Jun 2022 20:17:23 -0700 |
parents | 1f3bf1734a77 |
children |
line wrap: on
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/* * 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; r->allow_ranges = 0; 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, *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); } 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 = ngx_strlen(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(); }