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mapwmslayer.c
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mapwmslayer.c
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/*****************************************************************************
* $Id$
*
* Project: MapServer
* Purpose: Implementation of WMS CONNECTIONTYPE - client to WMS servers
* Author: Daniel Morissette, DM Solutions Group (morissette@dmsolutions.ca)
*
*****************************************************************************
* Copyright (c) 2001-2004, Daniel Morissette, DM Solutions Group Inc
*
* 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 "mapserver.h"
#include "maperror.h"
#include "mapogcsld.h"
#include "mapows.h"
#include <time.h>
#include <ctype.h>
#if defined(_WIN32) && !defined(__CYGWIN__)
#include <process.h>
#include <stdio.h>
#endif
#ifdef USE_GDAL
# include "cpl_vsi.h"
#endif
/**********************************************************************
* msInitWmsParamsObj()
*
**********************************************************************/
int msInitWmsParamsObj(wmsParamsObj *wmsparams)
{
wmsparams->onlineresource = NULL;
wmsparams->params = msCreateHashTable();
wmsparams->numparams=0;
wmsparams->httpcookiedata = NULL;
return MS_SUCCESS;
}
/**********************************************************************
* msFreeWmsParamsObj()
*
* Frees the contents of the object, but not the object itself.
**********************************************************************/
void msFreeWmsParamsObj(wmsParamsObj *wmsparams)
{
msFree(wmsparams->onlineresource);
wmsparams->onlineresource = NULL;
msFreeHashTable(wmsparams->params);
wmsparams->params = NULL;
msFree(wmsparams->httpcookiedata);
wmsparams->numparams=0;
}
/**********************************************************************
* msSetWMSParamString()
*
**********************************************************************/
#ifdef USE_WMS_LYR
static int msSetWMSParamString(wmsParamsObj *psWMSParams,
const char *name, const char * value,
int urlencode, int nVersion)
{
if (urlencode) {
char *pszTmp;
/*
* Special case handling for characters the WMS specification
* says should not be encoded, when they occur in certain
* parameters.
*
* Note: WMS 1.3 removes SRS and FORMAT from the set of
* exceptional cases, but renames SRS as CRS in any case.
*/
if( strcmp(name,"LAYERS") == 0 ||
strcmp(name,"STYLES") == 0 ||
strcmp(name,"BBOX") == 0 ) {
pszTmp = msEncodeUrlExcept(value,',');
} else if ( strcmp(name,"SRS") == 0 ) {
pszTmp = msEncodeUrlExcept(value,':');
} else if ( nVersion < OWS_1_3_0 && strcmp(name,"FORMAT") == 0 ) {
pszTmp = msEncodeUrlExcept(value,'/');
} else {
pszTmp = msEncodeUrl(value);
}
msInsertHashTable(psWMSParams->params, name, pszTmp);
msFree(pszTmp);
} else {
msInsertHashTable(psWMSParams->params, name, value);
}
psWMSParams->numparams++;
return MS_SUCCESS;
}
#endif /* def USE_WMS_LYR */
/**********************************************************************
* msSetWMSParamInt()
*
**********************************************************************/
#ifdef USE_WMS_LYR
static int msSetWMSParamInt(wmsParamsObj *wmsparams,
const char *name, int value)
{
char szBuf[100];
snprintf(szBuf, sizeof(szBuf), "%d", value);
msInsertHashTable(wmsparams->params, name, szBuf);
wmsparams->numparams++;
return MS_SUCCESS;
}
#endif /* def USE_WMS_LYR */
/**********************************************************************
* msBuildWMSParamsUrl()
*
**********************************************************************/
static char *msBuildURLFromWMSParams(wmsParamsObj *wmsparams)
{
const char *key, *value;
size_t bufferSize = 0;
int nLen;
char *pszURL;
/* Compute size required for URL buffer
*/
nLen = strlen(wmsparams->onlineresource) + 3;
key = msFirstKeyFromHashTable(wmsparams->params);
while (key != NULL) {
value = msLookupHashTable(wmsparams->params, key);
nLen += strlen(key) + strlen(value) + 2;
key = msNextKeyFromHashTable(wmsparams->params, key);
}
bufferSize = nLen+1;
pszURL = (char*)msSmallMalloc(bufferSize);
/* Start with the onlineresource value and append trailing '?' or '&'
* if missing.
*/
strcpy(pszURL, wmsparams->onlineresource);
if (strchr(pszURL, '?') == NULL)
strcat(pszURL, "?");
else {
char *c;
c = pszURL+strlen(pszURL)-1;
if (*c != '?' && *c != '&')
strcpy(c+1, "&");
}
/* Now add all the parameters
*/
nLen = strlen(pszURL);
key = msFirstKeyFromHashTable(wmsparams->params);
while (key != NULL) {
value = msLookupHashTable(wmsparams->params, key);
snprintf(pszURL+nLen, bufferSize-nLen, "%s=%s&", key, value);
nLen += strlen(key) + strlen(value) + 2;
key = msNextKeyFromHashTable(wmsparams->params, key);
}
/* Get rid of trailing '&'*/
pszURL[nLen-1] = '\0';
return pszURL;
}
#ifdef USE_WMS_LYR
/**********************************************************************
* msBuildWMSLayerURLBase()
*
* Build the base of a GetMap or GetFeatureInfo URL using metadata.
* The parameters to set are:
* VERSION
* LAYERS
* FORMAT
* TRANSPARENT
* STYLES
* QUERY_LAYERS (for queriable layers only)
*
* Returns a reference to a newly allocated string that should be freed
* by the caller.
**********************************************************************/
static int msBuildWMSLayerURLBase(mapObj *map, layerObj *lp,
wmsParamsObj *psWMSParams)
{
const char *pszOnlineResource, *pszVersion, *pszName, *pszFormat;
const char *pszFormatList, *pszStyle, /* *pszStyleList,*/ *pszTime;
const char *pszBgColor, *pszTransparent;
const char *pszSLD=NULL, *pszStyleSLDBody=NULL, *pszVersionKeyword=NULL;
const char *pszSLDBody=NULL, *pszSLDURL = NULL;
char *pszSLDGenerated = NULL;
int nVersion=OWS_VERSION_NOTSET;
/* If lp->connection is not set then use wms_onlineresource metadata */
pszOnlineResource = lp->connection;
if (pszOnlineResource == NULL)
pszOnlineResource = msOWSLookupMetadata(&(lp->metadata),
"MO", "onlineresource");
pszVersion = msOWSLookupMetadata(&(lp->metadata), "MO", "server_version");
pszName = msOWSLookupMetadata(&(lp->metadata), "MO", "name");
pszFormat = msOWSLookupMetadata(&(lp->metadata), "MO", "format");
pszFormatList = msOWSLookupMetadata(&(lp->metadata), "MO", "formatlist");
pszStyle = msOWSLookupMetadata(&(lp->metadata), "MO", "style");
/*pszStyleList = msOWSLookupMetadata(&(lp->metadata), "MO", "stylelist");*/
pszTime = msOWSLookupMetadata(&(lp->metadata), "MO", "time");
pszSLDBody = msOWSLookupMetadata(&(lp->metadata), "MO", "sld_body");
pszSLDURL = msOWSLookupMetadata(&(lp->metadata), "MO", "sld_url");
pszBgColor = msOWSLookupMetadata(&(lp->metadata), "MO", "bgcolor");
pszTransparent = msOWSLookupMetadata(&(lp->metadata), "MO", "transparent");
if (pszOnlineResource==NULL || pszVersion==NULL || pszName==NULL) {
msSetError(MS_WMSCONNERR,
"One of wms_onlineresource, wms_server_version, wms_name "
"metadata is missing in layer %s. "
"Please either provide a valid CONNECTION URL, or provide "
"those values in the layer's metadata.\n",
"msBuildWMSLayerURLBase()", lp->name);
return MS_FAILURE;
}
psWMSParams->onlineresource = msStrdup(pszOnlineResource);
if (strncmp(pszVersion, "1.0.7", 5) < 0)
pszVersionKeyword = "WMTVER";
else
pszVersionKeyword = "VERSION";
nVersion = msOWSParseVersionString(pszVersion);
/* WMS 1.0.8 is really just 1.1.0 */
if (nVersion == OWS_1_0_8) nVersion = OWS_1_1_0;
msSetWMSParamString(psWMSParams, pszVersionKeyword, pszVersion, MS_FALSE, nVersion);
msSetWMSParamString(psWMSParams, "SERVICE", "WMS", MS_FALSE, nVersion);
msSetWMSParamString(psWMSParams, "LAYERS", pszName, MS_TRUE, nVersion);
if (pszFormat==NULL && pszFormatList==NULL) {
msSetError(MS_WMSCONNERR,
"At least wms_format or wms_formatlist is required for "
"layer %s. "
"Please either provide a valid CONNECTION URL, or provide "
"those values in the layer's metadata.\n",
"msBuildWMSLayerURLBase()", lp->name);
return MS_FAILURE;
}
if (pszFormat != NULL) {
msSetWMSParamString(psWMSParams, "FORMAT", pszFormat, MS_TRUE, nVersion);
} else {
/* Look for the first format in list that matches */
char **papszTok;
int i, n;
papszTok = msStringSplit(pszFormatList, ',', &n);
for(i=0; pszFormat==NULL && i<n; i++) {
if (0
#if defined USE_PNG
|| strcasecmp(papszTok[i], "PNG")
|| strcasecmp(papszTok[i], "image/png")
#endif
#if defined USE_JPEG
|| strcasecmp(papszTok[i], "JPEG")
|| strcasecmp(papszTok[i], "image/jpeg")
#endif
) {
pszFormat = papszTok[i];
}
}
if (pszFormat) {
msSetWMSParamString(psWMSParams, "FORMAT", pszFormat, MS_TRUE, nVersion);
msFreeCharArray(papszTok, n);
} else {
msSetError(MS_WMSCONNERR,
"Could not find a format that matches supported input "
"formats in wms_formatlist metdata in layer %s. "
"Please either provide a valid CONNECTION URL, or "
"provide the required layer metadata.\n",
"msBuildWMSLayerURLBase()", lp->name);
msFreeCharArray(papszTok, n);
return MS_FAILURE;
}
}
if (pszStyle==NULL) {
/* When no style is selected, use "" which is a valid default. */
pszStyle = "";
} else {
/* Was a wms_style_..._sld URL provided? */
char szBuf[100];
snprintf(szBuf, sizeof(szBuf), "style_%.80s_sld", pszStyle);
pszSLD = msOWSLookupMetadata(&(lp->metadata), "MO", szBuf);
snprintf(szBuf, sizeof(szBuf), "style_%.80s_sld_body", pszStyle);
pszStyleSLDBody = msOWSLookupMetadata(&(lp->metadata), "MO", szBuf);
if (pszSLD || pszStyleSLDBody) {
/* SLD URL is set. If this defn. came from a map context then */
/* the style name may just be an internal name: "Style{%d}" if */
/* that's the case then we should not pass this name via the URL */
if (strncmp(pszStyle, "Style{", 6) == 0)
pszStyle = "";
}
}
/* set STYLES no matter what, even if it's empty (i.e. "STYLES=")
* styles is a required param of WMS
*/
msSetWMSParamString(psWMSParams, "STYLES", pszStyle, MS_TRUE, nVersion);
if (pszSLD != NULL) {
/* Only SLD is set */
msSetWMSParamString(psWMSParams, "SLD", pszSLD, MS_TRUE, nVersion);
} else if (pszStyleSLDBody != NULL) {
/* SLDBODY are set */
msSetWMSParamString(psWMSParams, "SLD_BODY", pszStyleSLDBody, MS_TRUE, nVersion);
}
if (msIsLayerQueryable(lp)) {
msSetWMSParamString(psWMSParams, "QUERY_LAYERS", pszName, MS_TRUE, nVersion);
}
if (pszTime && strlen(pszTime) > 0) {
msSetWMSParamString(psWMSParams, "TIME", pszTime, MS_TRUE, nVersion);
}
/* if the metadata wms_sld_body is set to AUTO, we generate
* the sld based on classes found in the map file and send
* it in the URL. If diffrent from AUTO, we are assuming that
* it is a valid sld.
*/
if (pszSLDBody) {
if (strcasecmp(pszSLDBody, "AUTO") == 0) {
if (pszVersion && strncmp(pszVersion, "1.3.0", 5) == 0)
pszSLDGenerated = msSLDGenerateSLD(map, lp->index, "1.1.0");
else
pszSLDGenerated = msSLDGenerateSLD(map, lp->index, NULL);
if (pszSLDGenerated) {
msSetWMSParamString(psWMSParams, "SLD_BODY",
pszSLDGenerated, MS_TRUE, nVersion);
free(pszSLDGenerated);
}
} else {
msSetWMSParamString(psWMSParams, "SLD_BODY", pszSLDBody, MS_TRUE, nVersion);
}
}
if (pszSLDURL) {
msSetWMSParamString(psWMSParams, "SLD", pszSLDURL, MS_TRUE, nVersion);
}
if (pszBgColor) {
msSetWMSParamString(psWMSParams, "BGCOLOR", pszBgColor, MS_TRUE, nVersion);
}
if (pszTransparent) {
msSetWMSParamString(psWMSParams, "TRANSPARENT", pszTransparent, MS_TRUE, nVersion);
} else {
msSetWMSParamString(psWMSParams, "TRANSPARENT", "TRUE", MS_TRUE, nVersion);
}
return MS_SUCCESS;
}
#endif /* USE_WMS_LYR */
/**********************************************************************
* msBuildWMSLayerURL()
*
* Build a GetMap or GetFeatureInfo URL.
*
* Returns a reference to a newly allocated string that should be freed
* by the caller.
**********************************************************************/
static int
msBuildWMSLayerURL(mapObj *map, layerObj *lp, int nRequestType,
int nClickX, int nClickY, int nFeatureCount,
const char *pszInfoFormat, rectObj *bbox_ret,
int *width_ret, int *height_ret,
wmsParamsObj *psWMSParams)
{
#ifdef USE_WMS_LYR
char *pszEPSG = NULL;
const char *pszVersion, *pszRequestParam, *pszExceptionsParam,
*pszSrsParamName="SRS", *pszLayer=NULL, *pszQueryLayers=NULL,
*pszUseStrictAxisOrder;
rectObj bbox;
int bbox_width = map->width, bbox_height = map->height;
int nVersion=OWS_VERSION_NOTSET;
int bUseStrictAxisOrder = MS_FALSE; /* this is the assumption up to 1.1.0 */
int bFlipAxisOrder = MS_FALSE;
if (lp->connectiontype != MS_WMS) {
msSetError(MS_WMSCONNERR, "Call supported only for CONNECTIONTYPE WMS",
"msBuildWMSLayerURL()");
return MS_FAILURE;
}
/* ------------------------------------------------------------------
* Find out request version
* ------------------------------------------------------------------ */
if (lp->connection == NULL ||
((pszVersion = strstr(lp->connection, "VERSION=")) == NULL &&
(pszVersion = strstr(lp->connection, "version=")) == NULL &&
(pszVersion = strstr(lp->connection, "WMTVER=")) == NULL &&
(pszVersion = strstr(lp->connection, "wmtver=")) == NULL ) ) {
/* CONNECTION missing or seems incomplete... try to build from metadata */
if (msBuildWMSLayerURLBase(map, lp, psWMSParams) != MS_SUCCESS)
return MS_FAILURE; /* An error already produced. */
/* If we received MS_SUCCESS then version must have been set */
pszVersion = msLookupHashTable(psWMSParams->params, "VERSION");
if (pszVersion ==NULL)
pszVersion = msLookupHashTable(psWMSParams->params, "WMTVER");
nVersion = msOWSParseVersionString(pszVersion);
} else {
/* CONNECTION string seems complete, start with that. */
char *pszDelimiter;
psWMSParams->onlineresource = msStrdup(lp->connection);
/* Fetch version info */
pszVersion = strchr(pszVersion, '=')+1;
pszDelimiter = strchr(pszVersion, '&');
if (pszDelimiter != NULL)
*pszDelimiter = '\0';
nVersion = msOWSParseVersionString(pszVersion);
if (pszDelimiter != NULL)
*pszDelimiter = '&';
}
switch (nVersion) {
case OWS_1_0_8:
nVersion = OWS_1_1_0; /* 1.0.8 == 1.1.0 */
break;
case OWS_1_0_0:
case OWS_1_0_1:
case OWS_1_0_7:
case OWS_1_1_0:
case OWS_1_1_1:
/* All is good, this is a supported version. */
break;
case OWS_1_3_0:
/* 1.3.0 introduces a few changes... */
pszSrsParamName = "CRS";
bUseStrictAxisOrder = MS_TRUE; /* this is the assumption for 1.3.0 */
break;
default:
/* Not a supported version */
msSetError(MS_WMSCONNERR, "MapServer supports only WMS 1.0.0 to 1.3.0 (please verify the VERSION parameter in the connection string).", "msBuildWMSLayerURL()");
return MS_FAILURE;
}
/* ------------------------------------------------------------------
* For GetFeatureInfo requests, make sure QUERY_LAYERS is included
* ------------------------------------------------------------------ */
if (nRequestType == WMS_GETFEATUREINFO &&
strstr(psWMSParams->onlineresource, "QUERY_LAYERS=") == NULL &&
strstr(psWMSParams->onlineresource, "query_layers=") == NULL &&
msLookupHashTable(psWMSParams->params, "QUERY_LAYERS") == NULL) {
pszQueryLayers = msOWSLookupMetadata(&(lp->metadata), "MO", "name");
if (pszQueryLayers == NULL) {
msSetError(MS_WMSCONNERR, "wms_name not set or WMS Connection String must contain the QUERY_LAYERS parameter to support GetFeatureInfo requests (with name in uppercase).", "msBuildWMSLayerURL()");
return MS_FAILURE;
}
}
/* ------------------------------------------------------------------
* For GetLegendGraphic requests, make sure LAYER is included
* ------------------------------------------------------------------ */
if (nRequestType == WMS_GETLEGENDGRAPHIC &&
strstr(psWMSParams->onlineresource, "LAYER=") == NULL &&
strstr(psWMSParams->onlineresource, "layer=") == NULL &&
msLookupHashTable(psWMSParams->params, "LAYER") == NULL) {
pszLayer = msOWSLookupMetadata(&(lp->metadata), "MO", "name");
if (pszLayer == NULL) {
msSetError(MS_WMSCONNERR, "wms_name not set or WMS Connection String must contain the LAYER parameter to support GetLegendGraphic requests (with name in uppercase).", "msBuildWMSLayerURL()");
return MS_FAILURE;
}
}
/* ------------------------------------------------------------------
* Figure the SRS we'll use for the request.
* - Fetch the map SRS (if it's EPSG)
* - Check if map SRS is listed in layer wms_srs metadata
* - If map SRS is valid for this layer then use it
* - Otherwise request layer in its default SRS and we'll reproject later
* ------------------------------------------------------------------ */
msOWSGetEPSGProj(&(map->projection),NULL, NULL, MS_TRUE, &pszEPSG);
if ( pszEPSG &&
(strncasecmp(pszEPSG, "EPSG:", 5) == 0 ||
strncasecmp(pszEPSG, "AUTO:", 5) == 0) ) {
const char *pszFound;
char *pszLyrEPSG;
int nLen;
char *pszPtr = NULL;
/* If it's an AUTO projection then keep only id and strip off */
/* the parameters for now (we'll restore them at the end) */
if (strncasecmp(pszEPSG, "AUTO:", 5) == 0) {
if ((pszPtr = strchr(pszEPSG, ',')))
*pszPtr = '\0';
}
nLen = strlen(pszEPSG);
msOWSGetEPSGProj(&(lp->projection), &(lp->metadata), "MO", MS_FALSE, &pszLyrEPSG);
if (pszLyrEPSG == NULL ||
(pszFound = strstr(pszLyrEPSG, pszEPSG)) == NULL ||
! ((*(pszFound+nLen) == '\0') || isspace(*(pszFound+nLen))) ) {
/* Not found in Layer's list of SRS (including projection object) */
free(pszEPSG);
pszEPSG = NULL;
}
msFree(pszLyrEPSG);
if (pszEPSG && pszPtr)
*pszPtr = ','; /* Restore full AUTO:... definition */
}
if (pszEPSG == NULL) {
msOWSGetEPSGProj(&(lp->projection), &(lp->metadata),"MO", MS_TRUE, &pszEPSG);
if( pszEPSG == NULL || (strncasecmp(pszEPSG, "EPSG:", 5) != 0 && strncasecmp(pszEPSG, "AUTO:", 5) != 0) ) {
msSetError(MS_WMSCONNERR, "Layer must have an EPSG or AUTO projection code (in its PROJECTION object or wms_srs metadata)", "msBuildWMSLayerURL()");
msFree(pszEPSG);
return MS_FAILURE;
}
}
/* ------------------------------------------------------------------
* For an AUTO projection, set the Units,lon0,lat0 if not already set
* ------------------------------------------------------------------ */
if (strncasecmp(pszEPSG, "AUTO:", 5) == 0 &&
strchr(pszEPSG, ',') == NULL) {
pointObj oPoint;
char *pszNewEPSG;
/* Use center of map view for lon0,lat0 */
oPoint.x = (map->extent.minx + map->extent.maxx)/2.0;
oPoint.y = (map->extent.miny + map->extent.maxy)/2.0;
msProjectPoint(&(map->projection), &(map->latlon), &oPoint);
pszNewEPSG = (char*)msSmallMalloc(101*sizeof(char));
snprintf(pszNewEPSG, 100, "%s,9001,%.16g,%.16g",
pszEPSG, oPoint.x, oPoint.y);
pszNewEPSG[100]='\0';
free(pszEPSG);
pszEPSG=pszNewEPSG;
}
/*
* Work out whether we'll be wanting to flip the axis order for the request
*/
pszUseStrictAxisOrder = msOWSLookupMetadata(&(lp->metadata), "MO", "strict_axis_order");
if (pszUseStrictAxisOrder != NULL) {
if (strncasecmp(pszUseStrictAxisOrder, "1", 1) == 0 ||
strncasecmp(pszUseStrictAxisOrder, "true", 4) == 0) {
bUseStrictAxisOrder = MS_TRUE;
} else if (strncasecmp(pszUseStrictAxisOrder, "0", 1) == 0 ||
strncasecmp(pszUseStrictAxisOrder, "false", 5) == 0) {
bUseStrictAxisOrder = MS_FALSE;
}
}
if (bUseStrictAxisOrder == MS_TRUE && pszEPSG &&
strncasecmp(pszEPSG, "EPSG:", 5) == 0 &&
msIsAxisInverted(atoi(pszEPSG + 5))) {
bFlipAxisOrder = MS_TRUE;
}
/* ------------------------------------------------------------------
* Set layer SRS.
* ------------------------------------------------------------------ */
/* No need to set lp->proj if it's already set to the right EPSG code */
{
char* pszEPSGCodeFromLayer = NULL;
msOWSGetEPSGProj(&(lp->projection), NULL, "MO", MS_TRUE, &pszEPSGCodeFromLayer);
if (pszEPSGCodeFromLayer == NULL || strcasecmp(pszEPSG, pszEPSGCodeFromLayer) != 0) {
char *ows_srs;
msOWSGetEPSGProj(NULL,&(lp->metadata), "MO", MS_FALSE, &ows_srs);
/* no need to set lp->proj if it is already set and there is only
one item in the _srs metadata for this layer - we will assume
the projection block matches the _srs metadata (the search for ' '
in ows_srs is a test to see if there are multiple EPSG: codes) */
if( lp->projection.numargs == 0 || ows_srs == NULL || (strchr(ows_srs,' ') != NULL) ) {
msFree(ows_srs);
if (strncasecmp(pszEPSG, "EPSG:", 5) == 0) {
char szProj[20];
snprintf(szProj, sizeof(szProj), "init=epsg:%s", pszEPSG+5);
if (msLoadProjectionString(&(lp->projection), szProj) != 0)
return MS_FAILURE;
} else {
if (msLoadProjectionString(&(lp->projection), pszEPSG) != 0)
return MS_FAILURE;
}
}
}
msFree(pszEPSGCodeFromLayer);
}
/* ------------------------------------------------------------------
* Adjust for MapServer EXTENT being center of pixel and WMS BBOX being
* edge of pixel (#2843).
* ------------------------------------------------------------------ */
bbox = map->extent;
bbox.minx -= map->cellsize * 0.5;
bbox.maxx += map->cellsize * 0.5;
bbox.miny -= map->cellsize * 0.5;
bbox.maxy += map->cellsize * 0.5;
/* -------------------------------------------------------------------- */
/* Reproject if needed. */
/* -------------------------------------------------------------------- */
if (msProjectionsDiffer(&(map->projection), &(lp->projection))) {
msProjectRect(&(map->projection), &(lp->projection), &bbox);
/* -------------------------------------------------------------------- */
/* Sometimes our remote WMS only accepts square pixel */
/* requests. If this is the case adjust adjust the number of */
/* pixels or lines in the request so that the pixels are */
/* square. */
/* -------------------------------------------------------------------- */
{
const char *nonsquare_ok =
msOWSLookupMetadata(&(lp->metadata),
"MO", "nonsquare_ok");
/* assume nonsquare_ok is false */
if( nonsquare_ok != NULL
&& (strcasecmp(nonsquare_ok,"no") == 0
|| strcasecmp(nonsquare_ok,"false") == 0) ) {
double cellsize_x = (bbox.maxx-bbox.minx) / bbox_width;
double cellsize_y = (bbox.maxy-bbox.miny) / bbox_height;
if( cellsize_x < cellsize_y * 0.999999 ) {
int new_bbox_height =
ceil((cellsize_y/cellsize_x) * bbox_height);
if (lp->debug)
msDebug("NONSQUARE_OK=%s, adjusted HEIGHT from %d to %d to equalize cellsize at %g.\n",
nonsquare_ok,
bbox_height, new_bbox_height, cellsize_x );
bbox_height = new_bbox_height;
} else if( cellsize_y < cellsize_x * 0.999999 ) {
int new_bbox_width =
ceil((cellsize_x/cellsize_y) * bbox_width);
if (lp->debug)
msDebug("NONSQUARE_OK=%s, adjusted WIDTH from %d to %d to equalize cellsize at %g.\n",
nonsquare_ok,
bbox_width, new_bbox_width, cellsize_y );
bbox_width = new_bbox_width;
} else {
if (lp->debug)
msDebug("NONSQUARE_OK=%s, but cellsize was already square - no change.\n",
nonsquare_ok );
}
}
}
}
/* -------------------------------------------------------------------- */
/* If the layer has predefined extents, and a predefined */
/* projection that matches the request projection, then */
/* consider restricting the BBOX to match the limits. */
/* -------------------------------------------------------------------- */
if( bbox_width != 0 ) {
char *ows_srs;
rectObj layer_rect;
msOWSGetEPSGProj(&(lp->projection), &(lp->metadata), "MO", MS_FALSE, &ows_srs);
if( ows_srs && strchr(ows_srs,' ') == NULL
&& msOWSGetLayerExtent( map, lp, "MO", &layer_rect) == MS_SUCCESS ) {
/* fulloverlap */
if( msRectContained( &bbox, &layer_rect ) ) {
/* no changes */
}
/* no overlap */
else if( !msRectOverlap( &layer_rect, &bbox ) ) {
bbox_width = 0;
bbox_height = 0;
}
else {
double cellsize_x = (bbox.maxx-bbox.minx) / bbox_width;
double cellsize_y = (bbox.maxy-bbox.miny) / bbox_height;
double cellsize = MS_MIN(cellsize_x,cellsize_y);
msRectIntersect( &bbox, &layer_rect );
bbox_width = ceil((bbox.maxx - bbox.minx) / cellsize);
bbox_height = ceil((bbox.maxy - bbox.miny) / cellsize);
/* Force going through the resampler if we're going to receive a clipped BBOX (#4931) */
if(msLayerGetProcessingKey(lp, "RESAMPLE") == NULL) {
msLayerSetProcessingKey(lp, "RESAMPLE", "nearest");
}
}
}
msFree(ows_srs);
}
/* -------------------------------------------------------------------- */
/* Potentially return the bbox. */
/* -------------------------------------------------------------------- */
if (bbox_ret != NULL)
*bbox_ret = bbox;
if( width_ret != NULL )
*width_ret = bbox_width;
if( height_ret != NULL )
*height_ret = bbox_height;
/* ------------------------------------------------------------------
* Build the request URL.
* At this point we set only the following parameters for GetMap:
* REQUEST
* SRS (or CRS)
* BBOX
*
* And for GetFeatureInfo:
* X (I for 1.3.0)
* Y (J for 1.3.0)
* INFO_FORMAT
* FEATURE_COUNT (only if nFeatureCount > 0)
*
* The connection string should contain all other required params,
* including:
* VERSION
* LAYERS
* FORMAT
* TRANSPARENT
* STYLES
* QUERY_LAYERS (for queryable layers only)
* ------------------------------------------------------------------ */
if (nRequestType == WMS_GETFEATUREINFO) {
char szBuf[100] = "";
if (nVersion >= OWS_1_0_7)
pszRequestParam = "GetFeatureInfo";
else
pszRequestParam = "feature_info";
if (nVersion >= OWS_1_3_0)
pszExceptionsParam = "XML";
else if (nVersion >= OWS_1_1_0) /* 1.1.0 to 1.1.0 */
pszExceptionsParam = "application/vnd.ogc.se_xml";
else if (nVersion > OWS_1_0_0) /* 1.0.1 to 1.0.7 */
pszExceptionsParam = "SE_XML";
else
pszExceptionsParam = "WMS_XML";
msSetWMSParamString(psWMSParams, "REQUEST", pszRequestParam, MS_FALSE, nVersion);
msSetWMSParamInt( psWMSParams, "WIDTH", bbox_width);
msSetWMSParamInt( psWMSParams, "HEIGHT", bbox_height);
msSetWMSParamString(psWMSParams, pszSrsParamName, pszEPSG, MS_FALSE, nVersion);
if (bFlipAxisOrder == MS_TRUE) {
snprintf(szBuf, sizeof(szBuf), "%.15g,%.15g,%.15g,%.15g",
bbox.miny, bbox.minx, bbox.maxy, bbox.maxx);
} else {
snprintf(szBuf, sizeof(szBuf), "%.15g,%.15g,%.15g,%.15g",
bbox.minx, bbox.miny, bbox.maxx, bbox.maxy);
}
msSetWMSParamString(psWMSParams, "BBOX", szBuf, MS_TRUE, nVersion);
if (nVersion >= OWS_1_3_0) {
msSetWMSParamInt( psWMSParams, "I", nClickX);
msSetWMSParamInt( psWMSParams, "J", nClickY);
} else {
msSetWMSParamInt( psWMSParams, "X", nClickX);
msSetWMSParamInt( psWMSParams, "Y", nClickY);
}
msSetWMSParamString(psWMSParams, "EXCEPTIONS", pszExceptionsParam, MS_FALSE, nVersion);
msSetWMSParamString(psWMSParams, "INFO_FORMAT", pszInfoFormat, MS_TRUE, nVersion);
if (pszQueryLayers) { /* not set in CONNECTION string */
msSetWMSParamString(psWMSParams, "QUERY_LAYERS", pszQueryLayers, MS_FALSE, nVersion);
}
/* If FEATURE_COUNT <= 0 then don't pass this parameter */
/* The spec states that FEATURE_COUNT must be greater than zero */
/* and if not passed then the behavior is up to the server */
if (nFeatureCount > 0) {
msSetWMSParamInt(psWMSParams, "FEATURE_COUNT", nFeatureCount);
}
} else if (nRequestType == WMS_GETLEGENDGRAPHIC) {
if(map->extent.maxx > map->extent.minx && map->width > 0 && map->height > 0) {
char szBuf[20] = "";
double scaledenom;
msCalculateScale(map->extent, map->units, map->width, map->height,
map->resolution, &scaledenom);
snprintf(szBuf, 20, "%g",scaledenom);
msSetWMSParamString(psWMSParams, "SCALE", szBuf, MS_FALSE, nVersion);
}
pszRequestParam = "GetLegendGraphic";
pszExceptionsParam = msOWSLookupMetadata(&(lp->metadata),
"MO", "exceptions_format");
if (pszExceptionsParam == NULL) {
if (nVersion >= OWS_1_1_0 && nVersion < OWS_1_3_0)
pszExceptionsParam = "application/vnd.ogc.se_inimage";
else
pszExceptionsParam = "INIMAGE";
}
if (pszLayer) { /* not set in CONNECTION string */
msSetWMSParamString(psWMSParams, "LAYER", pszLayer, MS_FALSE, nVersion);
}
msSetWMSParamString(psWMSParams, "REQUEST", pszRequestParam, MS_FALSE, nVersion);
msSetWMSParamString(psWMSParams, pszSrsParamName, pszEPSG, MS_FALSE, nVersion);
} else { /* if (nRequestType == WMS_GETMAP) */
char szBuf[100] = "";
if (nVersion >= OWS_1_0_7)
pszRequestParam = "GetMap";
else
pszRequestParam = "map";
pszExceptionsParam = msOWSLookupMetadata(&(lp->metadata),
"MO", "exceptions_format");
if (pszExceptionsParam == NULL) {
if (nVersion >= OWS_1_1_0 && nVersion < OWS_1_3_0)
pszExceptionsParam = "application/vnd.ogc.se_inimage";
else
pszExceptionsParam = "INIMAGE";
}
msSetWMSParamString(psWMSParams, "REQUEST", pszRequestParam, MS_FALSE, nVersion);
msSetWMSParamInt( psWMSParams, "WIDTH", bbox_width);
msSetWMSParamInt( psWMSParams, "HEIGHT", bbox_height);
msSetWMSParamString(psWMSParams, pszSrsParamName, pszEPSG, MS_FALSE, nVersion);
if (bFlipAxisOrder == MS_TRUE) {
snprintf(szBuf, sizeof(szBuf), "%.15g,%.15g,%.15g,%.15g",
bbox.miny, bbox.minx, bbox.maxy, bbox.maxx);
} else {
snprintf(szBuf, sizeof(szBuf), "%.15g,%.15g,%.15g,%.15g",
bbox.minx, bbox.miny, bbox.maxx, bbox.maxy);
}
msSetWMSParamString(psWMSParams, "BBOX", szBuf, MS_TRUE, nVersion);
msSetWMSParamString(psWMSParams, "EXCEPTIONS", pszExceptionsParam, MS_FALSE, nVersion);
}
free(pszEPSG);
return MS_SUCCESS;
#else
/* ------------------------------------------------------------------
* WMS CONNECTION Support not included...
* ------------------------------------------------------------------ */
msSetError(MS_WMSCONNERR, "WMS CLIENT CONNECTION support is not available.",
"msBuildWMSLayerURL()");
return MS_FAILURE;
#endif /* USE_WMS_LYR */
}
/**********************************************************************
* msWMSGetFeatureInfoURL()
*
* Build a GetFeatureInfo URL for this layer.
*
* Returns a reference to a newly allocated string that should be freed
* by the caller.
**********************************************************************/
char *msWMSGetFeatureInfoURL(mapObj *map, layerObj *lp,
int nClickX, int nClickY, int nFeatureCount,
const char *pszInfoFormat)
{
wmsParamsObj sThisWMSParams;
char *pszURL;
msInitWmsParamsObj(&sThisWMSParams);
if (msBuildWMSLayerURL(map, lp, WMS_GETFEATUREINFO,
nClickX, nClickY, nFeatureCount,
pszInfoFormat, NULL, NULL, NULL,
&sThisWMSParams)!= MS_SUCCESS) {
return NULL;
}
pszURL = msBuildURLFromWMSParams(&sThisWMSParams);
msFreeWmsParamsObj(&sThisWMSParams);
return pszURL;
}
/**********************************************************************
* msPrepareWMSLayerRequest()
*
**********************************************************************/
int msPrepareWMSLayerRequest(int nLayerId, mapObj *map, layerObj *lp,
int nRequestType, enum MS_CONNECTION_TYPE lastconnectiontype,
wmsParamsObj *psLastWMSParams,
int nClickX, int nClickY, int nFeatureCount, const char *pszInfoFormat,
httpRequestObj *pasReqInfo, int *numRequests)
{
#ifdef USE_WMS_LYR
char *pszURL = NULL, *pszHTTPCookieData = NULL;
const char *pszTmp;
rectObj bbox;
int bbox_width, bbox_height;
int nTimeout, bOkToMerge, bForceSeparateRequest, bCacheToDisk;
wmsParamsObj sThisWMSParams;
if (lp->connectiontype != MS_WMS)
return MS_FAILURE;
msInitWmsParamsObj(&sThisWMSParams);
/* ------------------------------------------------------------------
* Build the request URL, this will also set layer projection and
* compute BBOX in that projection.
* ------------------------------------------------------------------ */
if (nRequestType == WMS_GETMAP &&
( msBuildWMSLayerURL(map, lp, WMS_GETMAP,
0, 0, 0, NULL, &bbox, &bbox_width, &bbox_height,
&sThisWMSParams) != MS_SUCCESS) ) {
/* an error was already reported. */
msFreeWmsParamsObj(&sThisWMSParams);
return MS_FAILURE;
}
else if (nRequestType == WMS_GETFEATUREINFO &&
msBuildWMSLayerURL(map, lp, WMS_GETFEATUREINFO,
nClickX, nClickY, nFeatureCount, pszInfoFormat,
NULL, NULL, NULL,
&sThisWMSParams) != MS_SUCCESS ) {
/* an error was already reported. */
msFreeWmsParamsObj(&sThisWMSParams);
return MS_FAILURE;
} else if (nRequestType == WMS_GETLEGENDGRAPHIC &&
msBuildWMSLayerURL(map, lp, WMS_GETLEGENDGRAPHIC,
0, 0, 0, NULL,
NULL, NULL, NULL,
&sThisWMSParams) != MS_SUCCESS ) {
/* an error was already reported. */
msFreeWmsParamsObj(&sThisWMSParams);
return MS_FAILURE;
}
/* ------------------------------------------------------------------