mirror of
https://github.com/Unidata/netcdf-c.git
synced 2024-12-03 08:01:25 +08:00
539 lines
13 KiB
C
539 lines
13 KiB
C
/*********************************************************************
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* Copyright 2010, UCAR/Unidata
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* See netcdf/COPYRIGHT file for copying and redistribution conditions.
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* $Header$
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*********************************************************************/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "nc_uri.h"
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#define NC_URIDEBUG
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#define LBRACKET '['
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#define RBRACKET ']'
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#ifndef FIX
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#define FIX(s) ((s)==NULL?"":(s))
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#endif
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#ifndef NILLEN
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#define NILLEN(s) ((s)==NULL?0:strlen(s))
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#endif
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static char* legalprotocols[] = {
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"file:",
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"http:",
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"https:",
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"ftp:",
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NULL /* NULL terminate*/
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};
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static void nc_paramfree(char** params);
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static int nc_find(char** params, const char* key);
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/* Do a simple uri parse: return 0 if fail, 1 otherwise*/
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int
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nc_uriparse(const char* uri0, NC_URI** nc_urip)
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{
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NC_URI* nc_uri = NULL;
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char* uri;
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char** pp;
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char* p;
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char* p1;
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int c;
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/* accumulate parse points*/
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char* protocol = NULL;
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char* params = NULL;
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char* host = NULL;
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char* port = NULL;
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char* constraint = NULL;
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char* user = NULL;
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char* pwd = NULL;
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char* file = NULL;
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char* stop;
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nc_uri = (NC_URI*)calloc(1,sizeof(NC_URI));
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if(nc_uri == NULL) return 0;
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/* make local copy of uri */
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uri = strdup(uri0);
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/* remove all whitespace*/
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p = uri;
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p1 = uri;
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while((c=*p1++)) {if(c != ' ' && c != '\t') *p++ = c;}
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p = uri;
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stop = p + strlen(p);
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/* break up the uri string into pieces*/
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/* 1. leading bracketed parameters */
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if(*p == LBRACKET) {
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params = p+1;
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/* find end of the clientparams*/
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for(;*p;p++) {if(p[0] == RBRACKET && p[1] != LBRACKET) break;}
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if(*p == 0) goto fail; /* malformed client params*/
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*p = '\0'; /* leave off the trailing rbracket for now */
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p++; /* move past the params*/
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}
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/* verify that the uri starts with an acceptable protocol*/
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for(pp=legalprotocols;*pp;pp++) {
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if(strncmp(p,*pp,strlen(*pp))==0) break;
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}
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if(*pp == NULL) goto fail; /* illegal protocol*/
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/* save the protocol */
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protocol = *pp;
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/* 4. skip protocol */
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p += strlen(protocol);
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/* 5. skip // */
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if(*p != '/' && *(p+1) != '/')
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goto fail;
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p += 2;
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/* 6. Mark the end of the host section */
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file = strchr(p,'/');
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if(file) {
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*file++ = '\0'; /* warning: we just overwrote the leading / */
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} else
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goto fail; /* url only has host part, no path */
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/* 7. extract any user:pwd */
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p1 = strchr(p,'@');
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if(p1) {/* Assume we have user:pwd@ */
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*p1 = '\0';
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user = p;
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pwd = strchr(p,':');
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if(!pwd) goto fail; /* malformed */
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*pwd++ = '\0';
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p = pwd+strlen(pwd)+1;
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}
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/* 8. extract host and port */
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host = p;
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port = strchr(p,':');
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if(port) {
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*port++ = '\0';
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}
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/* 9. Look for '?' */
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constraint = strchr(file,'?');
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if(constraint) {
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*constraint++ = '\0';
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}
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/* assemble the component pieces*/
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if(uri0 && strlen(uri0) > 0)
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nc_uri->uri = strdup(uri0);
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if(protocol && strlen(protocol) > 0) {
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nc_uri->protocol = strdup(protocol);
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/* remove trailing ':' */
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nc_uri->protocol[strlen(protocol)-1] = '\0';
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}
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if(user && strlen(user) > 0)
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nc_uri->user = strdup(user);
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if(pwd && strlen(pwd) > 0)
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nc_uri->password = strdup(pwd);
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if(host && strlen(host) > 0)
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nc_uri->host = strdup(host);
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if(port && strlen(port) > 0)
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nc_uri->port = strdup(port);
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if(file && strlen(file) > 0) {
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/* Add back the leading / */
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nc_uri->file = malloc(strlen(file)+2);
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strcpy(nc_uri->file,"/");
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strcat(nc_uri->file,file);
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}
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if(constraint && strlen(constraint) > 0)
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nc_uri->constraint = strdup(constraint);
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nc_urisetconstraints(nc_uri,constraint);
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if(params != NULL && strlen(params) > 0) {
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nc_uri->params = (char*)malloc(1+2+strlen(params));
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strcpy(nc_uri->params,"[");
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strcat(nc_uri->params,params);
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strcat(nc_uri->params,"]");
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}
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#ifdef NC_XDEBUG
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{
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fprintf(stderr,"nc_uri:");
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fprintf(stderr," params=|%s|",FIX(nc_uri->params));
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fprintf(stderr," protocol=|%s|",FIX(nc_uri->protocol));
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fprintf(stderr," host=|%s|",FIX(nc_uri->host));
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fprintf(stderr," port=|%s|",FIX(nc_uri->port));
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fprintf(stderr," file=|%s|",FIX(nc_uri->file));
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fprintf(stderr," constraint=|%s|",FIX(nc_uri->constraint));
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fprintf(stderr,"\n");
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}
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#endif
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free(uri);
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if(nc_urip != NULL) *nc_urip = nc_uri;
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return 1;
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fail:
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if(nc_uri) nc_urifree(nc_uri);
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if(uri != NULL) free(uri);
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return 0;
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}
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void
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nc_urifree(NC_URI* nc_uri)
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{
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if(nc_uri == NULL) return;
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if(nc_uri->uri != NULL) {free(nc_uri->uri);}
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if(nc_uri->protocol != NULL) {free(nc_uri->protocol);}
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if(nc_uri->user != NULL) {free(nc_uri->user);}
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if(nc_uri->password != NULL) {free(nc_uri->password);}
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if(nc_uri->host != NULL) {free(nc_uri->host);}
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if(nc_uri->port != NULL) {free(nc_uri->port);}
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if(nc_uri->file != NULL) {free(nc_uri->file);}
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if(nc_uri->constraint != NULL) {free(nc_uri->constraint);}
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if(nc_uri->projection != NULL) {free(nc_uri->projection);}
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if(nc_uri->selection != NULL) {free(nc_uri->selection);}
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if(nc_uri->params != NULL) {free(nc_uri->params);}
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if(nc_uri->paramlist != NULL) nc_paramfree(nc_uri->paramlist);
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free(nc_uri);
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}
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/* Replace the constraints */
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void
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nc_urisetconstraints(NC_URI* duri,const char* constraints)
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{
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char* proj = NULL;
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char* select = NULL;
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const char* p;
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if(duri->constraint == NULL) free(duri->constraint);
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if(duri->projection != NULL) free(duri->projection);
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if(duri->selection != NULL) free(duri->selection);
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duri->constraint = NULL;
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duri->projection = NULL;
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duri->selection = NULL;
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if(constraints == NULL || strlen(constraints)==0) return;
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duri->constraint = strdup(constraints);
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if(*duri->constraint == '?')
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strcpy(duri->constraint,duri->constraint+1);
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p = duri->constraint;
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proj = (char*) p;
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select = strchr(proj,'&');
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if(select != NULL) {
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size_t plen = (select - proj);
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if(plen == 0) {
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proj = NULL;
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} else {
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proj = (char*)malloc(plen+1);
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memcpy((void*)proj,p,plen);
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proj[plen] = '\0';
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}
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select = nulldup(select);
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} else {
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proj = nulldup(proj);
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select = NULL;
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}
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duri->projection = proj;
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duri->selection = select;
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}
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/* Construct a complete NC_ URI without the client params
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and optionally with the constraints;
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caller frees returned string
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*/
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char*
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nc_uribuild(NC_URI* duri, const char* prefix, const char* suffix, int pieces)
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{
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size_t len = 0;
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char* newuri;
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int withparams = ((pieces&NC_URIPARAMS)
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&& duri->params != NULL);
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int withuserpwd = ((pieces&NC_URIUSERPWD)
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&& duri->user != NULL && duri->password != NULL);
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int withconstraints = ((pieces&NC_URICONSTRAINTS)
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&& duri->constraint != NULL);
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if(prefix != NULL) len += NILLEN(prefix);
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if(withparams) {
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len += NILLEN("[]");
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len += NILLEN(duri->params);
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}
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len += (NILLEN(duri->protocol)+NILLEN("://"));
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if(withuserpwd) {
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len += (NILLEN(duri->user)+NILLEN(duri->password)+NILLEN(":@"));
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}
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len += (NILLEN(duri->host));
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if(duri->port != NULL) {
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len += (NILLEN(":")+NILLEN(duri->port));
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}
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len += (NILLEN(duri->file));
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if(suffix != NULL) len += NILLEN(suffix);
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if(withconstraints) {
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len += (NILLEN("?")+NILLEN(duri->constraint));
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}
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len += 1; /* null terminator */
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newuri = (char*)malloc(len);
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if(!newuri) return NULL;
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newuri[0] = '\0';
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if(prefix != NULL) strcat(newuri,prefix);
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if(withparams) {
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strcat(newuri,"[");
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strcat(newuri,duri->params);
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strcat(newuri,"]");
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}
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strcat(newuri,duri->protocol);
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strcat(newuri,"://");
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if(withuserpwd) {
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strcat(newuri,duri->user);
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strcat(newuri,":");
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strcat(newuri,duri->password);
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strcat(newuri,"@");
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}
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if(duri->host != NULL) { /* may be null if using file: protocol */
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strcat(newuri,duri->host);
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}
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if(duri->port != NULL) {
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strcat(newuri,":");
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strcat(newuri,duri->port);
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}
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strcat(newuri,duri->file);
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if(suffix != NULL) strcat(newuri,suffix);
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if(withconstraints) {
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strcat(newuri,"?");
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strcat(newuri,duri->constraint);
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}
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return newuri;
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}
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/**************************************************/
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/* Parameter support */
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/*
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Client parameters are assumed to be
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one or more instances of bracketed pairs:
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e.g "[...][...]...".
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The bracket content in turn is assumed to be a
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comma separated list of <name>=<value> pairs.
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e.g. x=y,z=,a=b.
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If the same parameter is specifed more than once,
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then the first occurrence is used; this is so that
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is possible to forcibly override user specified
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parameters by prefixing.
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IMPORTANT: client parameter string is assumed to
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have blanks compress out.
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Returns 1 if parse suceeded, 0 otherwise;
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*/
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int
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nc_uridecodeparams(NC_URI* nc_uri)
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{
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char* cp;
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char* cq;
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int c;
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int i;
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int nparams;
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char* params0;
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char* params;
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char* params1;
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char** plist;
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if(nc_uri == NULL) return 0;
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if(nc_uri->params == NULL) return 1;
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params0 = nc_uri->params;
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/* Pass 1 to replace beginning '[' and ending ']' */
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if(params0[0] == '[')
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params = strdup(params0+1);
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else
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params = strdup(params0);
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if(params[strlen(params)-1] == ']')
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params[strlen(params)-1] = '\0';
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/* Pass 2 to replace "][" pairs with ','*/
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params1 = strdup(params);
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cp=params; cq = params1;
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while((c=*cp++)) {
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if(c == RBRACKET && *cp == LBRACKET) {cp++; c = ',';}
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*cq++ = c;
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}
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*cq = '\0';
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free(params);
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params = params1;
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/* Pass 3 to break string into pieces and count # of pairs */
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nparams=0;
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for(cp=params;(c=*cp);cp++) {
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if(c == ',') {*cp = '\0'; nparams++;}
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}
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nparams++; /* for last one */
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/* plist is an env style list */
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plist = (char**)calloc(1,sizeof(char*)*(2*nparams+1)); /* +1 for null termination */
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/* Pass 4 to break up each pass into a (name,value) pair*/
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/* and insert into the param list */
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/* parameters of the form name name= are converted to name=""*/
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cp = params;
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for(i=0;i<nparams;i++) {
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char* next = cp+strlen(cp)+1; /* save ptr to next pair*/
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char* vp;
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/*break up the ith param*/
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vp = strchr(cp,'=');
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if(vp != NULL) {*vp = '\0'; vp++;} else {vp = "";}
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plist[2*i] = strdup(cp);
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plist[2*i+1] = strdup(vp);
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cp = next;
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}
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plist[2*nparams] = NULL;
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free(params);
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if(nc_uri->paramlist != NULL)
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nc_paramfree(nc_uri->paramlist);
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nc_uri->paramlist = plist;
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return 1;
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}
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int
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nc_urilookup(NC_URI* uri, const char* key, const char** resultp)
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{
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int i;
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char* value = NULL;
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if(uri == NULL || key == NULL || uri->params == NULL) return 0;
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if(uri->paramlist == NULL) {
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i = nc_uridecodeparams(uri);
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if(!i) return 0;
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}
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i = nc_find(uri->paramlist,key);
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if(i < 0) return 0;
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value = uri->paramlist[(2*i)+1];
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if(resultp) *resultp = value;
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return 1;
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}
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int
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nc_urisetparams(NC_URI* uri, const char* newparams)
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{
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if(uri == NULL) return 0;
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if(uri->paramlist != NULL) nc_paramfree(uri->paramlist);
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uri->paramlist = NULL;
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if(uri->params != NULL) free(uri->params);
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uri->params = nulldup(newparams);
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return 1;
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}
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/* Internal version of lookup; returns the paired index of the key */
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static int
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nc_find(char** params, const char* key)
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{
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int i;
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char** p;
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for(i=0,p=params;*p;p+=2,i++) {
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if(strcmp(key,*p)==0) return i;
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}
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return -1;
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}
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static void
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nc_paramfree(char** params)
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{
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char** p;
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if(params == NULL) return;
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for(p=params;*p;p+=2) {
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free(*p);
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if(p[1] != NULL) free(p[1]);
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}
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free(params);
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}
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#ifdef IGNORE
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/*
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Delete the entry.
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return value = 1 => found and deleted;
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0 => param not found
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*/
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int
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nc_paramdelete(char** params, const char* key)
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{
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int i;
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char** p;
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char** q;
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if(params == NULL || key == NULL) return 0;
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i = nc_find(params,key);
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if(i < 0) return 0;
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p = params+(2*i);
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for(q=p+2;*q;) {
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*p++ = *q++;
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}
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*p = NULL;
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return 1;
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}
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static int
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nc_length(char** params)
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{
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int i = 0;
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if(params != NULL) {
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while(*params) {params+=2; i++;}
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}
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return i;
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}
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/*
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Insert new client param (name,value);
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return value = 1 => not already defined
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0 => param already defined (no change)
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*/
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char**
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nc_paraminsert(char** params, const char* key, const char* value)
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{
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int i;
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char** newp;
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size_t len;
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if(params == NULL || key == NULL) return 0;
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i = nc_find(params,key);
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if(i >= 0) return 0;
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/* not found, append */
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i = nc_length(params);
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len = sizeof(char*)*((2*i)+1);
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newp = realloc(params,len+2*sizeof(char*));
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memcpy(newp,params,len);
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newp[2*i] = strdup(key);
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newp[2*i+1] = (value==NULL?NULL:strdup(value));
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return newp;
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}
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/*
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Replace new client param (name,value);
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return value = 1 => replacement performed
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0 => key not found (no change)
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*/
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int
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|
nc_paramreplace(char** params, const char* key, const char* value)
|
|
{
|
|
int i;
|
|
if(params == NULL || key == NULL) return 0;
|
|
i = nc_find(params,key);
|
|
if(i < 0) return 0;
|
|
if(params[2*i+1] != NULL) free(params[2*i+1]);
|
|
params[2*i+1] = nulldup(value);
|
|
return 1;
|
|
}
|
|
#endif
|