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mapows.c
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mapows.c
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/******************************************************************************
* $Id$
*
* Project: MapServer
* Purpose: OGC Web Services (WMS, WFS) support functions
* Author: Daniel Morissette, DM Solutions Group (morissette@dmsolutions.ca)
*
******************************************************************************
* Copyright (c) 1996-2005 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 "mapserver.h"
#include "maptime.h"
#include "maptemplate.h"
#if defined(USE_LIBXML2)
#include "maplibxml2.h"
#elif defined(USE_GDAL)
#include "cpl_minixml.h"
#include "cpl_error.h"
#endif
#include <ctype.h> /* isalnum() */
#include <stdarg.h>
#include <assert.h>
/*
** msOWSInitRequestObj() initializes an owsRequestObj; i.e: sets
** all internal pointers to NULL.
*/
static void msOWSInitRequestObj(owsRequestObj *ows_request)
{
ows_request->numlayers = 0;
ows_request->enabled_layers = NULL;
ows_request->service = NULL;
ows_request->version = NULL;
ows_request->request = NULL;
ows_request->document = NULL;
}
/*
** msOWSClearRequestObj() releases all resources associated with an
** owsRequestObj.
*/
static void msOWSClearRequestObj(owsRequestObj *ows_request)
{
msFree(ows_request->enabled_layers);
msFree(ows_request->service);
msFree(ows_request->version);
msFree(ows_request->request);
if(ows_request->document)
{
#if defined(USE_LIBXML2)
xmlFreeDoc(ows_request->document);
xmlCleanupParser();
#elif defined(USE_GDAL)
CPLDestroyXMLNode(ows_request->document);
#endif
}
}
/*
** msOWSPreParseRequest() parses a cgiRequestObj either with GET/KVP
** or with POST/XML. Only SERVICE, VERSION (or WMTVER) and REQUEST are
** being determined, all WxS (or SOS) specific parameters are parsed
** within the according handler.
** The results are saved within an owsRequestObj. If the request was
** transmitted with POST/XML, either the document (if compiled with
** libxml2) or the root CPLXMLNode is saved to the ows_request->document
** field.
** Returns MS_SUCCESS upon success, MS_FAILURE if severe errors occurred
** or MS_DONE, if the service could not be determined.
*/
static int msOWSPreParseRequest(cgiRequestObj *request,
owsRequestObj *ows_request)
{
/* decide if KVP or XML */
if (request->type == MS_GET_REQUEST)
{
int i;
/* parse KVP parameters service, version and request */
for (i = 0; i < request->NumParams; ++i)
{
if (EQUAL(request->ParamNames[i], "SERVICE"))
{
ows_request->service = msStrdup(request->ParamValues[i]);
}
else if (EQUAL(request->ParamNames[i], "VERSION")
|| EQUAL(request->ParamNames[i], "WMTVER")) /* for WMS */
{
ows_request->version = msStrdup(request->ParamValues[i]);
}
else if (EQUAL(request->ParamNames[i], "REQUEST"))
{
ows_request->request = msStrdup(request->ParamValues[i]);
}
/* stop if we have all necessary parameters */
if(ows_request->service && ows_request->version && ows_request->request)
{
break;
}
}
}
else if (request->type == MS_POST_REQUEST)
{
#if defined(USE_LIBXML2)
xmlNodePtr root = NULL;
#elif defined(USE_GDAL)
CPLXMLNode *temp;
#endif
if (!request->postrequest || !strlen(request->postrequest))
{
msSetError(MS_OWSERR, "POST request is empty.",
"msOWSPreParseRequest()");
return MS_FAILURE;
}
#if defined(USE_LIBXML2)
/* parse to DOM-Structure with libxml2 and get the root element */
ows_request->document = xmlParseMemory(request->postrequest,
strlen(request->postrequest));
if (ows_request->document == NULL
|| (root = xmlDocGetRootElement(ows_request->document)) == NULL)
{
xmlErrorPtr error = xmlGetLastError();
msSetError(MS_OWSERR, "XML parsing error: %s",
"msOWSPreParseRequest()", error->message);
return MS_FAILURE;
}
/* Get service, version and request from root */
ows_request->service = (char *) xmlGetProp(root, BAD_CAST "service");
ows_request->version = (char *) xmlGetProp(root, BAD_CAST "version");
ows_request->request = msStrdup((char *) root->name);
#elif defined(USE_GDAL)
/* parse with CPLXML */
ows_request->document = CPLParseXMLString(request->postrequest);
if (ows_request->document == NULL)
{
msSetError(MS_OWSERR, "XML parsing error: %s",
"msOWSPreParseRequest()", CPLGetLastErrorMsg());
return MS_FAILURE;
}
/* remove all namespaces */
CPLStripXMLNamespace(ows_request->document, NULL, 1);
for (temp = ows_request->document;
temp != NULL;
temp = temp->psNext)
{
if (temp->eType == CXT_Element)
{
const char *service, *version;
ows_request->request = msStrdup(temp->pszValue);
if ((service = CPLGetXMLValue(temp, "service", NULL)) != NULL)
{
ows_request->service = msStrdup(service);
}
if ((version = CPLGetXMLValue(temp, "version", NULL)) != NULL)
{
ows_request->version = msStrdup(version);
}
continue;
}
}
#else
/* could not parse XML since no parser was compiled */
msSetError(MS_OWSERR, "Could not parse the POST XML since MapServer"
"was not compiled with libxml2 or GDAL.",
"msOWSPreParseRequest()");
return MS_FAILURE;
#endif /* defined(USE_LIBXML2) */
}
else
{
msSetError(MS_OWSERR, "Unknown request method. Use either GET or POST.",
"msOWSPreParseRequest()");
return MS_FAILURE;
}
/* certain WMS requests do not require the service parameter */
/* see: http://trac.osgeo.org/mapserver/ticket/2531 */
if (ows_request->service == NULL
&& ows_request->request != NULL)
{
if (EQUAL(ows_request->request, "GetMap")
|| EQUAL(ows_request->request, "GetFeatureInfo"))
{
ows_request->service = msStrdup("WMS");
}
else /* service could not be determined */
{
return MS_DONE;
}
}
return MS_SUCCESS;
}
/*
** msOWSDispatch() is the entry point for any OWS request (WMS, WFS, ...)
** - If this is a valid request then it is processed and MS_SUCCESS is returned
** on success, or MS_FAILURE on failure.
** - If force_ows_mode is true then an exception will be produced if the
** request is not recognized as a valid request.
** - If force_ows_mode is false and this does not appear to be a valid OWS
** request then MS_DONE is returned and MapServer is expected to process
** this as a regular MapServer (traditional CGI) request.
*/
int msOWSDispatch(mapObj *map, cgiRequestObj *request, int ows_mode)
{
int status = MS_DONE, force_ows_mode = 0;
owsRequestObj ows_request;
if (!request)
{
return status;
}
force_ows_mode = (ows_mode == OWS || ows_mode == WFS);
msOWSInitRequestObj(&ows_request);
switch(msOWSPreParseRequest(request, &ows_request))
{
case MS_FAILURE: /* a severe error occurred */
return MS_FAILURE;
case MS_DONE:
/* OWS Service could not be determined */
/* continue for now */
status = MS_DONE;
}
if (ows_request.service == NULL)
{
/* exit if service is not set */
if(force_ows_mode)
{
msSetError( MS_MISCERR,
"OWS Common exception: exceptionCode=MissingParameterValue, locator=SERVICE, ExceptionText=SERVICE parameter missing.",
"msOWSDispatch()");
status = MS_FAILURE;
}
else
{
status = MS_DONE;
}
}
else if (EQUAL(ows_request.service, "WMS"))
{
#ifdef USE_WMS_SVR
status = msWMSDispatch(map, request, &ows_request, MS_FALSE);
#else
msSetError( MS_WMSERR,
"SERVICE=WMS requested, but WMS support not configured in MapServer.",
"msOWSDispatch()" );
#endif
}
else if (EQUAL(ows_request.service, "WFS"))
{
#ifdef USE_WFS_SVR
status = msWFSDispatch(map, request, &ows_request, (ows_mode == WFS));
#else
msSetError( MS_WFSERR,
"SERVICE=WFS requested, but WFS support not configured in MapServer.",
"msOWSDispatch()" );
#endif
}
else if (EQUAL(ows_request.service, "WCS"))
{
#ifdef USE_WCS_SVR
status = msWCSDispatch(map, request, &ows_request);
#else
msSetError( MS_WCSERR,
"SERVICE=WCS requested, but WCS support not configured in MapServer.",
"msOWSDispatch()" );
#endif
}
else if (EQUAL(ows_request.service, "SOS"))
{
#ifdef USE_SOS_SVR
status = msSOSDispatch(map, request, &ows_request);
#else
msSetError( MS_SOSERR,
"SERVICE=SOS requested, but SOS support not configured in MapServer.",
"msOWSDispatch()" );
#endif
}
else if(force_ows_mode)
{
msSetError( MS_MISCERR,
"OWS Common exception: exceptionCode=InvalidParameterValue, locator=SERVICE, ExceptionText=SERVICE parameter value invalid.",
"msOWSDispatch()");
status = MS_FAILURE;
}
msOWSClearRequestObj(&ows_request);
return status;
}
/*
** msOWSRequestIsEnabled()
**
** Check if a layer is visible for a specific OWS request.
**
** 'namespaces' is a string with a letter for each namespace to lookup in
** the order they should be looked up. e.g. "MO" to lookup wms_ and ows_ If
** namespaces is NULL then this function just does a regular metadata
** lookup. If check_all_layers is set to MS_TRUE, the function will check
** all layers to see if the request is enable. (returns as soon as one is found) */
int msOWSRequestIsEnabled(mapObj *map, layerObj *layer,
const char *namespaces, const char *request, int check_all_layers)
{
int disabled = MS_FALSE; /* explicitly disabled flag */
const char *enable_request;
if (request == NULL)
return MS_FALSE;
/* First, we check in the layer metadata */
if (layer && check_all_layers == MS_FALSE)
{
enable_request = msOWSLookupMetadata(&layer->metadata, namespaces, "enable_request");
if (msOWSParseRequestMetadata(enable_request, request, &disabled))
return MS_TRUE;
if (disabled) return MS_FALSE;
enable_request = msOWSLookupMetadata(&layer->metadata, "O", "enable_request");
if (msOWSParseRequestMetadata(enable_request, request, &disabled))
return MS_TRUE;
if (disabled) return MS_FALSE;
}
if (map && check_all_layers == MS_FALSE)
{
/* then we check in the map metadata */
enable_request = msOWSLookupMetadata(&map->web.metadata, namespaces, "enable_request");
if (msOWSParseRequestMetadata(enable_request, request, &disabled))
return MS_TRUE;
if (disabled) return MS_FALSE;
enable_request = msOWSLookupMetadata(&map->web.metadata, "O", "enable_request");
if (msOWSParseRequestMetadata(enable_request, request, &disabled))
return MS_TRUE;
if (disabled) return MS_FALSE;
}
if (map && (map->numlayers > 0) && check_all_layers == MS_TRUE)
{
int i, globally_enabled = MS_FALSE;
enable_request = msOWSLookupMetadata(&map->web.metadata, namespaces, "enable_request");
globally_enabled = msOWSParseRequestMetadata(enable_request, request, &disabled);
if (!globally_enabled && !disabled)
{
enable_request = msOWSLookupMetadata(&map->web.metadata, "O", "enable_request");
globally_enabled = msOWSParseRequestMetadata(enable_request, request, &disabled);
}
/* Check all layers */
for(i=0; i<map->numlayers; i++)
{
int result = MS_FALSE;
layerObj *lp;
lp = (GET_LAYER(map, i));
enable_request = msOWSLookupMetadata(&lp->metadata, namespaces, "enable_request");
result = msOWSParseRequestMetadata(enable_request, request, &disabled);
if (!result && disabled) continue; /* if the request has been explicitly set to disabled, continue */
if (!result && !disabled) /* if the request has not been found in the wms metadata, */
{ /* check the ows namespace */
enable_request = msOWSLookupMetadata(&lp->metadata, "O", "enable_request");
result = msOWSParseRequestMetadata(enable_request, request, &disabled);
if (!result && disabled) continue;
}
if (result || (!disabled && globally_enabled))
return MS_TRUE;
}
}
return MS_FALSE;
}
/*
** msOWSRequestLayersEnabled()
**
** Check if the layers are visible for a specific OWS request.
**
** 'namespaces' is a string with a letter for each namespace to lookup
** in the order they should be looked up. e.g. "MO" to lookup wms_ and ows_
** If namespaces is NULL then this function just does a regular metadata
** lookup.
**
** Generates an array of the layer ids enabled.
*/
void msOWSRequestLayersEnabled(mapObj *map, const char *namespaces,
const char *request, owsRequestObj *ows_request)
{
int disabled = MS_FALSE; /* explicitly disabled flag */
int globally_enabled = MS_FALSE;
const char *enable_request;
if (ows_request->numlayers > 0)
msFree(ows_request->enabled_layers);
ows_request->numlayers = 0;
ows_request->enabled_layers = NULL;
if (request == NULL || (map == NULL) || (map->numlayers <= 0))
return;
enable_request = msOWSLookupMetadata(&map->web.metadata, namespaces, "enable_request");
globally_enabled = msOWSParseRequestMetadata(enable_request, request, &disabled);
if (!globally_enabled && !disabled)
{
enable_request = msOWSLookupMetadata(&map->web.metadata, "O", "enable_request");
globally_enabled = msOWSParseRequestMetadata(enable_request, request, &disabled);
}
if (map->numlayers)
{
int i, layers_size = map->numlayers; /* for most of cases, this will be relatively small */
ows_request->enabled_layers = (int*)msSmallMalloc(sizeof(int)*layers_size);
for(i=0; i<map->numlayers; i++)
{
int result = MS_FALSE;
layerObj *lp;
lp = (GET_LAYER(map, i));
enable_request = msOWSLookupMetadata(&lp->metadata, namespaces, "enable_request");
result = msOWSParseRequestMetadata(enable_request, request, &disabled);
if (!result && disabled) continue; /* if the request has been explicitly set to disabled, continue */
if (!result && !disabled) /* if the request has not been found in the wms metadata, */
{ /* check the ows namespace */
enable_request = msOWSLookupMetadata(&lp->metadata, "O", "enable_request");
result = msOWSParseRequestMetadata(enable_request, request, &disabled);
if (!result && disabled) continue;
}
if (result || (!disabled && globally_enabled))
{
ows_request->enabled_layers[ows_request->numlayers] = lp->index;
ows_request->numlayers++;
}
}
if (ows_request->numlayers == 0)
{
msFree(ows_request->enabled_layers);
ows_request->enabled_layers = NULL;
}
}
}
/* msOWSParseRequestMetadata
*
* This function parse a enable_request metadata string and check if the
* given request is present and enabled.
*/
int msOWSParseRequestMetadata(const char *metadata, const char *request, int *disabled)
{
char requestBuffer[32];
int wordFlag = MS_FALSE;
int disableFlag = MS_FALSE;
int allFlag = MS_FALSE;
char *bufferPtr, *ptr = NULL;
int i;
size_t len = 0;
*disabled = MS_FALSE;
if (metadata == NULL)
return MS_FALSE;
ptr = (char*)metadata;
len = strlen(ptr);
requestBuffer[0] = '\0';
bufferPtr = requestBuffer;
for (i=0; i<=len;++i,++ptr) {
if (!wordFlag && isspace(*ptr))
continue;
wordFlag = MS_TRUE;
if (*ptr == '!') {
disableFlag = MS_TRUE;
continue;
}
else if ( (*ptr == ' ') || (*ptr != '\0' && ptr[1] == '\0')) { /* end of word */
if (ptr[1] == '\0' && *ptr != ' ') {
*bufferPtr = *ptr;
++bufferPtr;
}
*bufferPtr = '\0';
if (strcasecmp(request, requestBuffer) == 0) {
*disabled = MS_TRUE; /* explicitly found, will stop the process in msOWSRequestIsEnabled() */
return (disableFlag ? MS_FALSE:MS_TRUE);
}
else {
if (strcmp("*", requestBuffer) == 0) { /* check if we read the all flag */
if (disableFlag)
*disabled = MS_TRUE;
allFlag = disableFlag ? MS_FALSE:MS_TRUE;
}
/* reset flags */
wordFlag = MS_FALSE;
disableFlag = MS_FALSE;
bufferPtr = requestBuffer;
}
}
else {
*bufferPtr = *ptr;
++bufferPtr;
}
}
return allFlag;
}
/*
** msOWSLookupMetadata()
**
** Attempts to lookup a given metadata name in multiple OWS namespaces.
**
** 'namespaces' is a string with a letter for each namespace to lookup
** in the order they should be looked up. e.g. "MO" to lookup wms_ and ows_
** If namespaces is NULL then this function just does a regular metadata
** lookup.
*/
const char *msOWSLookupMetadata(hashTableObj *metadata,
const char *namespaces, const char *name)
{
const char *value = NULL;
if (namespaces == NULL)
{
value = msLookupHashTable(metadata, (char*)name);
}
else
{
char buf[100] = "ows_";
strlcpy(buf+4, name, 96);
while (value == NULL && *namespaces != '\0')
{
switch (*namespaces)
{
case 'O': /* ows_... */
buf[0] = 'o';
buf[1] = 'w';
buf[2] = 's';
break;
case 'M': /* wms_... */
buf[0] = 'w';
buf[1] = 'm';
buf[2] = 's';
break;
case 'F': /* wfs_... */
buf[0] = 'w';
buf[1] = 'f';
buf[2] = 's';
break;
case 'C': /* wcs_... */
buf[0] = 'w';
buf[1] = 'c';
buf[2] = 's';
break;
case 'G': /* gml_... */
buf[0] = 'g';
buf[1] = 'm';
buf[2] = 'l';
break;
case 'S': /* sos_... */
buf[0] = 's';
buf[1] = 'o';
buf[2] = 's';
break;
default:
/* We should never get here unless an invalid code (typo) is */
/* present in the code, but since this happened before... */
msSetError(MS_WMSERR,
"Unsupported metadata namespace code (%c).",
"msOWSLookupMetadata()", *namespaces );
assert(MS_FALSE);
return NULL;
}
value = msLookupHashTable(metadata, buf);
namespaces++;
}
}
return value;
}
/*
** msOWSLookupMetadataWithLanguage()
**
** Attempts to lookup a given metadata name in multiple OWS namespaces
** for a specific language.
*/
const char *msOWSLookupMetadataWithLanguage(hashTableObj *metadata,
const char *namespaces, const char *name, const char* validated_language)
{
const char *value = NULL;
char *name2 = NULL;
size_t bufferSize = 0;
if ( name && validated_language )
{
bufferSize = strlen(name)+strlen(validated_language)+2;
name2 = (char *) msSmallMalloc( bufferSize );
snprintf(name2, bufferSize, "%s.%s", name, validated_language);
value = msOWSLookupMetadata(metadata, namespaces, name2);
}
if (value == NULL)
{
value = msOWSLookupMetadata(metadata, namespaces, name);
}
msFree( name2 );
return value;
}
/*
** msOWSLookupMetadata2()
**
** Attempts to lookup a given metadata name in multiple hashTables, and
** in multiple OWS namespaces within each. First searches the primary
** table and if no result is found, attempts the search using the
** secondary (fallback) table.
**
** 'namespaces' is a string with a letter for each namespace to lookup
** in the order they should be looked up. e.g. "MO" to lookup wms_ and ows_
** If namespaces is NULL then this function just does a regular metadata
** lookup.
*/
const char *msOWSLookupMetadata2(hashTableObj *pri,
hashTableObj *sec,
const char *namespaces,
const char *name)
{
const char *result;
if ((result = msOWSLookupMetadata(pri, namespaces, name)) == NULL)
{
/* Try the secondary table */
result = msOWSLookupMetadata(sec, namespaces, name);
}
return result;
}
/* msOWSParseVersionString()
**
** Parse a version string in the format "a.b.c" or "a.b" and return an
** integer in the format 0x0a0b0c suitable for regular integer comparisons.
**
** Returns one of OWS_VERSION_NOTSET or OWS_VERSION_BADFORMAT if version
** could not be parsed.
*/
int msOWSParseVersionString(const char *pszVersion)
{
char **digits = NULL;
int numDigits = 0;
if (pszVersion)
{
int nVersion = 0;
digits = msStringSplit(pszVersion, '.', &numDigits);
if (digits == NULL || numDigits < 2 || numDigits > 3)
{
msSetError(MS_OWSERR,
"Invalid version (%s). Version must be in the "
"format 'x.y' or 'x.y.z'",
"msOWSParseVersionString()", pszVersion);
if (digits)
msFreeCharArray(digits, numDigits);
return OWS_VERSION_BADFORMAT;
}
nVersion = atoi(digits[0])*0x010000;
nVersion += atoi(digits[1])*0x0100;
if (numDigits > 2)
nVersion += atoi(digits[2]);
msFreeCharArray(digits, numDigits);
return nVersion;
}
return OWS_VERSION_NOTSET;
}
/* msOWSGetVersionString()
**
** Returns a OWS version string in the format a.b.c from the integer
** version value passed as argument (0x0a0b0c)
**
** Fills in the pszBuffer and returns a reference to it. Recommended buffer
** size is OWS_VERSION_MAXLEN chars.
*/
const char *msOWSGetVersionString(int nVersion, char *pszBuffer)
{
if (pszBuffer)
snprintf(pszBuffer, OWS_VERSION_MAXLEN-1, "%d.%d.%d",
(nVersion/0x10000)%0x100, (nVersion/0x100)%0x100, nVersion%0x100);
return pszBuffer;
}
#if defined(USE_WMS_SVR) || defined (USE_WFS_SVR) || defined (USE_WCS_SVR) || defined(USE_SOS_SVR) || defined(USE_WMS_LYR) || defined(USE_WFS_LYR)
#if !defined(USE_PROJ)
#error "PROJ.4 is required for WMS, WFS, WCS and SOS Server Support."
#endif
/*
** msRenameLayer()
*/
static int msRenameLayer(layerObj *lp, int count)
{
char *newname;
newname = (char*)malloc((strlen(lp->name)+5)*sizeof(char));
if (!newname)
{
msSetError(MS_MEMERR, NULL, "msRenameLayer()");
return MS_FAILURE;
}
sprintf(newname, "%s_%2.2d", lp->name, count);
free(lp->name);
lp->name = newname;
return MS_SUCCESS;
}
/*
** msOWSMakeAllLayersUnique()
*/
int msOWSMakeAllLayersUnique(mapObj *map)
{
int i, j;
/* Make sure all layers in the map file have valid and unique names */
for(i=0; i<map->numlayers; i++)
{
int count=1;
for(j=i+1; j<map->numlayers; j++)
{
if (GET_LAYER(map, i)->name == NULL || GET_LAYER(map, j)->name == NULL)
{
continue;
}
if (strcasecmp(GET_LAYER(map, i)->name, GET_LAYER(map, j)->name) == 0 &&
msRenameLayer((GET_LAYER(map, j)), ++count) != MS_SUCCESS)
{
return MS_FAILURE;
}
}
/* Don't forget to rename the first layer if duplicates were found */
if (count > 1 && msRenameLayer((GET_LAYER(map, i)), 1) != MS_SUCCESS)
{
return MS_FAILURE;
}
}
return MS_SUCCESS;
}
/*
** msOWSNegotiateVersion()
**
** returns the most suitable version an OWS is to support given a client
** version parameter.
**
** supported_versions must be ordered from highest to lowest
**
** Returns a version integer of the supported version
**
*/
int msOWSNegotiateVersion(int requested_version, int supported_versions[], int num_supported_versions) {
int i;
/* if version is not set return highest version */
if (! requested_version)
return supported_versions[0];
/* if the requested version is lower than the lowest version return the lowest version */
if (requested_version < supported_versions[num_supported_versions-1])
return supported_versions[num_supported_versions-1];
/* return the first entry that's lower than or equal to the requested version */
for (i = 0; i < num_supported_versions; i++) {
if (supported_versions[i] <= requested_version)
return supported_versions[i];
}
return requested_version;
}
/*
** msOWSTerminateOnlineResource()
**
** Append trailing "?" or "&" to an onlineresource URL if it doesn't have
** one already. The returned string is then ready to append GET parameters
** to it.
**
** Returns a newly allocated string that should be freed by the caller or
** NULL in case of error.
*/
char * msOWSTerminateOnlineResource(const char *src_url)
{
char *online_resource = NULL;
size_t buffer_size = 0;
if (src_url == NULL)
return NULL;
buffer_size = strlen(src_url)+2;
online_resource = (char*) malloc(buffer_size);
if (online_resource == NULL)
{
msSetError(MS_MEMERR, NULL, "msOWSTerminateOnlineResource()");
return NULL;
}
strlcpy(online_resource, src_url, buffer_size);
/* Append trailing '?' or '&' if missing. */
if (strchr(online_resource, '?') == NULL)
strlcat(online_resource, "?", buffer_size);
else
{
char *c;
c = online_resource+strlen(online_resource)-1;
if (*c != '?' && *c != '&')
strlcpy(c+1, "&", buffer_size-strlen(online_resource));
}
return online_resource;
}
/*
** msOWSGetOnlineResource()
**
** Return the online resource for this service. First try to lookup
** specified metadata, and if not found then try to build the URL ourselves.
**
** Returns a newly allocated string that should be freed by the caller or
** NULL in case of error.
*/
char * msOWSGetOnlineResource(mapObj *map, const char *namespaces, const char *metadata_name,
cgiRequestObj *req)
{
const char *value;
char *online_resource = NULL;
/* We need this script's URL, including hostname. */
/* Default to use the value of the "onlineresource" metadata, and if not */
/* set then build it: "http://$(SERVER_NAME):$(SERVER_PORT)$(SCRIPT_NAME)?" */
/* (+append the map=... param if it was explicitly passed in QUERY_STRING) */
/* */
if ((value = msOWSLookupMetadata(&(map->web.metadata), namespaces, metadata_name)))
{
online_resource = msOWSTerminateOnlineResource(value);
}
else
{
if ((online_resource = msBuildOnlineResource(map, req)) == NULL)
{
msSetError(MS_CGIERR, "Impossible to establish server URL. Please set \"%s\" metadata.", "msOWSGetOnlineResource()", metadata_name);
return NULL;
}
}
return online_resource;
}
/*
** msOWSGetOnlineResource()
**
** Return the online resource for this service and add language parameter.
**
** Returns a newly allocated string that should be freed by the caller or
** NULL in case of error.
*/
char * msOWSGetOnlineResource2(mapObj *map, const char *namespaces, const char *metadata_name,
cgiRequestObj *req, const char* validated_language)
{
char *online_resource = msOWSGetOnlineResource(map, namespaces, metadata_name, req);
if ( online_resource && validated_language )
{
/* online_resource is already terminated, so we can simply add language=...& */
/* but first we need to make sure that online_resource has enough capacity */
online_resource = (char *)msSmallRealloc(online_resource, strlen(online_resource) + strlen(validated_language) + 11);
strcat(online_resource, "language=");
strcat(online_resource, validated_language);
strcat(online_resource, "&");
}
return online_resource;
}
/* msOWSGetSchemasLocation()
**
** schemas location is the root of the web tree where all WFS-related
** schemas can be found on this server. These URLs must exist in order
** to validate xml.
**
** Use value of "ows_schemas_location" metadata, if not set then
** return ".." as a default
*/
const char *msOWSGetSchemasLocation(mapObj *map)
{
const char *schemas_location;
schemas_location = msLookupHashTable(&(map->web.metadata),
"ows_schemas_location");
if (schemas_location == NULL)
schemas_location = OWS_DEFAULT_SCHEMAS_LOCATION;
return schemas_location;
}
/* msOWSGetLanguage()
**
** returns the language via MAP/WEB/METADATA/ows_language
**
** Use value of "ows_language" metadata, if not set then
** return "undefined" as a default
*/
const char *msOWSGetLanguage(mapObj *map, const char *context)
{
const char *language;
/* if this is an exception, MapServer always returns Exception
messages in en-US
*/
if (strcmp(context,"exception") == 0) {
language = MS_ERROR_LANGUAGE;
}
/* if not, fetch language from mapfile metadata */
else {
language = msLookupHashTable(&(map->web.metadata), "ows_language");
if (language == NULL) {
language = "undefined";
}
}
return language;
}
/* msOWSGetLanguageList
**
** Returns the list of languages that this service supports