/
source_wms.c
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/
source_wms.c
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/******************************************************************************
* $Id$
*
* Project: MapServer
* Purpose: MapCache tile caching support file: WMS datasources
* Author: Thomas Bonfort and the MapServer team.
*
******************************************************************************
* Copyright (c) 1996-2011 Regents of the University of Minnesota.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies of this Software or works derived from this Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#include "mapcache.h"
#include "ezxml.h"
#include <apr_tables.h>
#include <apr_strings.h>
typedef struct mapcache_source_wms mapcache_source_wms;
/**\class mapcache_source_wms
* \brief WMS mapcache_source
* \implements mapcache_source
*/
struct mapcache_source_wms {
mapcache_source source;
apr_table_t *wms_default_params; /**< default WMS parameters (SERVICE,REQUEST,STYLES,VERSION) */
apr_table_t *getmap_params; /**< WMS parameters specified in configuration */
apr_table_t *getfeatureinfo_params; /**< WMS parameters specified in configuration */
mapcache_http *http;
};
/**
* \private \memberof mapcache_source_wms
* \sa mapcache_source::render_map()
*/
void _mapcache_source_wms_render_map(mapcache_context *ctx, mapcache_source *psource, mapcache_map *map)
{
mapcache_source_wms *wms = (mapcache_source_wms*)psource;
mapcache_http *http;
apr_table_t *params = apr_table_clone(ctx->pool,wms->wms_default_params);
apr_table_setn(params,"BBOX",apr_psprintf(ctx->pool,"%f,%f,%f,%f",
map->extent.minx,map->extent.miny,map->extent.maxx,map->extent.maxy));
apr_table_setn(params,"WIDTH",apr_psprintf(ctx->pool,"%d",map->width));
apr_table_setn(params,"HEIGHT",apr_psprintf(ctx->pool,"%d",map->height));
apr_table_setn(params,"FORMAT","image/png");
apr_table_setn(params,"SRS",map->grid_link->grid->srs);
apr_table_overlap(params,wms->getmap_params,APR_OVERLAP_TABLES_SET);
if(map->dimensions && map->dimensions->nelts>0) {
int i;
for(i=0; i<map->dimensions->nelts; i++) {
mapcache_requested_dimension *rdim = APR_ARRAY_IDX(map->dimensions,i,mapcache_requested_dimension*);
/* set both DIM_key=val and key=val KVP params */
apr_table_setn(params,rdim->dimension->name,rdim->cached_value ? rdim->cached_value : rdim->requested_value);
if(strcasecmp(rdim->dimension->name,"TIME") && strcasecmp(rdim->dimension->name,"ELEVATION")) {
char *dim_name = apr_pstrcat(ctx->pool,"DIM_",rdim->dimension->name,NULL);
apr_table_setn(params,dim_name,rdim->cached_value ? rdim->cached_value : rdim->requested_value);
}
}
}
/* if the source has no LAYERS parameter defined, then use the tileset name
* as the LAYERS to request. When using mirror-mode, the source has no layers
* defined, it is added based on the incoming request
*/
if(!apr_table_get(params,"layers")) {
apr_table_set(params,"LAYERS",map->tileset->name);
}
map->encoded_data = mapcache_buffer_create(30000,ctx->pool);
http = mapcache_http_clone(ctx, wms->http);
http->url = mapcache_http_build_url(ctx,http->url,params);
mapcache_http_do_request(ctx,http,map->encoded_data,NULL,NULL);
GC_CHECK_ERROR(ctx);
if(!mapcache_imageio_is_raw_tileset(map->tileset) && !mapcache_imageio_is_valid_format(ctx,map->encoded_data)) {
char *returned_data = apr_pstrndup(ctx->pool,(char*)map->encoded_data->buf,map->encoded_data->size);
ctx->set_error(ctx, 502, "wms request for tileset %s returned an unsupported format:\n%s",
map->tileset->name, returned_data);
}
}
void _mapcache_source_wms_query(mapcache_context *ctx, mapcache_source *source, mapcache_feature_info *fi)
{
mapcache_map *map = (mapcache_map*)fi;
mapcache_http *http;
mapcache_source_wms *wms = (mapcache_source_wms*)source;
apr_table_t *params = apr_table_clone(ctx->pool,wms->wms_default_params);
apr_table_overlap(params,wms->getmap_params,0);
apr_table_setn(params,"BBOX",apr_psprintf(ctx->pool,"%f,%f,%f,%f",
map->extent.minx,map->extent.miny,map->extent.maxx,map->extent.maxy));
apr_table_setn(params,"REQUEST","GetFeatureInfo");
apr_table_setn(params,"WIDTH",apr_psprintf(ctx->pool,"%d",map->width));
apr_table_setn(params,"HEIGHT",apr_psprintf(ctx->pool,"%d",map->height));
apr_table_setn(params,"SRS",map->grid_link->grid->srs);
apr_table_setn(params,"X",apr_psprintf(ctx->pool,"%d",fi->i));
apr_table_setn(params,"Y",apr_psprintf(ctx->pool,"%d",fi->j));
apr_table_setn(params,"INFO_FORMAT",fi->format);
apr_table_overlap(params,wms->getfeatureinfo_params,0);
if(map->dimensions && map->dimensions->nelts>0) {
int i;
for(i=0; i<map->dimensions->nelts; i++) {
mapcache_requested_dimension *rdim = APR_ARRAY_IDX(map->dimensions,i,mapcache_requested_dimension*);
/* set both DIM_key=val and key=val KVP params */
apr_table_setn(params,rdim->dimension->name,rdim->requested_value);
if(strcasecmp(rdim->dimension->name,"TIME") && strcasecmp(rdim->dimension->name,"ELEVATION")) {
char *dim_name = apr_pstrcat(ctx->pool,"DIM_",rdim->dimension->name,NULL);
apr_table_setn(params,dim_name,rdim->requested_value);
}
}
}
fi->data = mapcache_buffer_create(30000,ctx->pool);
http = mapcache_http_clone(ctx, wms->http);
http->url = mapcache_http_build_url(ctx,http->url,params);
mapcache_http_do_request(ctx,http,fi->data,NULL,NULL);
GC_CHECK_ERROR(ctx);
}
/**
* \private \memberof mapcache_source_wms
* \sa mapcache_source::configuration_parse()
*/
void _mapcache_source_wms_configuration_parse_xml(mapcache_context *ctx, ezxml_t node, mapcache_source *source, mapcache_cfg *config)
{
ezxml_t cur_node;
mapcache_source_wms *src = (mapcache_source_wms*)source;
if ((cur_node = ezxml_child(node,"getmap")) != NULL) {
ezxml_t gm_node;
if ((gm_node = ezxml_child(cur_node,"params")) != NULL) {
for(gm_node = gm_node->child; gm_node; gm_node = gm_node->sibling) {
apr_table_set(src->getmap_params, gm_node->name, gm_node->txt);
}
} else {
ctx->set_error(ctx,400,"wms source %s <getmap> has no <params> block (should contain at least <LAYERS> child)",source->name);
return;
}
} else {
ctx->set_error(ctx,400,"wms source %s has no <getmap> block",source->name);
return;
}
if ((cur_node = ezxml_child(node,"getfeatureinfo")) != NULL) {
ezxml_t fi_node;
if ((fi_node = ezxml_child(cur_node,"info_formats")) != NULL) {
char *key,*last;
char *iformats;
source->info_formats = apr_array_make(ctx->pool,3,sizeof(char*));
iformats = apr_pstrdup(ctx->pool,fi_node->txt);
for (key = apr_strtok(iformats, "," , &last); key != NULL;
key = apr_strtok(NULL, ",", &last)) {
APR_ARRAY_PUSH(source->info_formats,char*) = key;
}
} else {
ctx->set_error(ctx,400,"wms source %s <getfeatureinfo> has no <info_formats> tag",source->name);
return;
}
if ((fi_node = ezxml_child(cur_node,"params")) != NULL) {
for(fi_node = fi_node->child; fi_node; fi_node = fi_node->sibling) {
apr_table_set(src->getfeatureinfo_params, fi_node->name, fi_node->txt);
}
} else {
ctx->set_error(ctx,400,"wms source %s <getfeatureinfo> has no <params> block (should contain at least <QUERY_LAYERS> child)",source->name);
return;
}
}
if ((cur_node = ezxml_child(node,"http")) != NULL) {
src->http = mapcache_http_configuration_parse_xml(ctx,cur_node);
}
}
/**
* \private \memberof mapcache_source_wms
* \sa mapcache_source::configuration_check()
*/
void _mapcache_source_wms_configuration_check(mapcache_context *ctx, mapcache_cfg *cfg,
mapcache_source *source)
{
mapcache_source_wms *src = (mapcache_source_wms*)source;
/* check all required parameters are configured */
if(!src->http) {
ctx->set_error(ctx, 400, "wms source %s has no <http> request configured",source->name);
}
if(!apr_table_get(src->getmap_params,"LAYERS")) {
if(cfg->mode == MAPCACHE_MODE_NORMAL) {
ctx->set_error(ctx, 400, "wms source %s has no LAYERS", source->name);
}
}
if(source->info_formats) {
if(!apr_table_get(src->getfeatureinfo_params,"QUERY_LAYERS")) {
ctx->set_error(ctx, 400, "wms source %s has no QUERY_LAYERS", source->name);
}
}
}
mapcache_source* mapcache_source_wms_create(mapcache_context *ctx)
{
mapcache_source_wms *source = apr_pcalloc(ctx->pool, sizeof(mapcache_source_wms));
if(!source) {
ctx->set_error(ctx, 500, "failed to allocate wms source");
return NULL;
}
mapcache_source_init(ctx, &(source->source));
source->source.type = MAPCACHE_SOURCE_WMS;
source->source._render_map = _mapcache_source_wms_render_map;
source->source.configuration_check = _mapcache_source_wms_configuration_check;
source->source.configuration_parse_xml = _mapcache_source_wms_configuration_parse_xml;
source->source._query_info = _mapcache_source_wms_query;
source->wms_default_params = apr_table_make(ctx->pool,4);;
source->getmap_params = apr_table_make(ctx->pool,4);
source->getfeatureinfo_params = apr_table_make(ctx->pool,4);
apr_table_add(source->wms_default_params,"VERSION","1.1.1");
apr_table_add(source->wms_default_params,"REQUEST","GetMap");
apr_table_add(source->wms_default_params,"SERVICE","WMS");
apr_table_add(source->wms_default_params,"STYLES","");
return (mapcache_source*)source;
}
/* vim: ts=2 sts=2 et sw=2
*/