[409] | 1 | /********************************************************************* |
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| 2 | * Copyright 2010, UCAR/Unidata |
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| 3 | * See netcdf/COPYRIGHT file for copying and redistribution conditions. |
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| 4 | * $Header$ |
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| 5 | *********************************************************************/ |
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| 6 | |
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| 7 | #include "config.h" |
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| 8 | |
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| 9 | #include <stdlib.h> |
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| 10 | #include <string.h> |
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| 11 | #include <stdio.h> |
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| 12 | |
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| 13 | #include "nc_uri.h" |
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| 14 | |
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| 15 | #define NC_URIDEBUG |
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| 16 | |
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| 17 | #define LBRACKET '[' |
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| 18 | #define RBRACKET ']' |
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| 19 | |
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| 20 | #ifndef FIX |
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| 21 | #define FIX(s) ((s)==NULL?"":(s)) |
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| 22 | #endif |
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| 23 | |
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| 24 | #ifndef NILLEN |
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| 25 | #define NILLEN(s) ((s)==NULL?0:strlen(s)) |
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| 26 | #endif |
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| 27 | |
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| 28 | |
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| 29 | static char* legalprotocols[] = { |
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| 30 | "file:", |
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| 31 | "http:", |
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| 32 | "https:", |
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| 33 | "ftp:", |
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| 34 | NULL /* NULL terminate*/ |
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| 35 | }; |
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| 36 | |
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| 37 | static void nc_paramfree(char** params); |
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| 38 | static int nc_find(char** params, const char* key); |
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| 39 | |
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| 40 | /* Do a simple uri parse: return 0 if fail, 1 otherwise*/ |
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| 41 | int |
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| 42 | nc_uriparse(const char* uri0, NC_URI** nc_urip) |
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| 43 | { |
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| 44 | NC_URI* nc_uri = NULL; |
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| 45 | char* uri; |
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| 46 | char** pp; |
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| 47 | char* p; |
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| 48 | char* p1; |
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| 49 | int c; |
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| 50 | |
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| 51 | /* accumulate parse points*/ |
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| 52 | char* protocol = NULL; |
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| 53 | char* params = NULL; |
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| 54 | char* host = NULL; |
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| 55 | char* port = NULL; |
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| 56 | char* constraint = NULL; |
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| 57 | char* user = NULL; |
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| 58 | char* pwd = NULL; |
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| 59 | char* file = NULL; |
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| 60 | |
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| 61 | nc_uri = (NC_URI*)calloc(1,sizeof(NC_URI)); |
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| 62 | if(nc_uri == NULL) return 0; |
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| 63 | |
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| 64 | /* Temporary hack to remove escape characters inserted by Windows or MinGW */ |
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| 65 | if(strchr(uri0,'\\') != NULL) { |
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| 66 | char* u = strdup(uri0); |
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| 67 | if(u == NULL) return 0; |
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| 68 | p = u; |
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| 69 | p1 = u; |
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| 70 | while((c=*p1++)) {if(c != '\\') *p++ = c;} |
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| 71 | uri0 = (const char*)u; |
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| 72 | } |
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| 73 | |
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| 74 | /* make local copy of uri */ |
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| 75 | uri = strdup(uri0); |
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| 76 | |
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| 77 | /* remove all whitespace*/ |
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| 78 | p = uri; |
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| 79 | p1 = uri; |
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| 80 | while((c=*p1++)) {if(c != ' ' && c != '\t') *p++ = c;} |
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| 81 | |
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| 82 | p = uri; |
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| 83 | |
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| 84 | /* break up the uri string into pieces*/ |
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| 85 | |
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| 86 | /* 1. leading bracketed parameters */ |
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| 87 | if(*p == LBRACKET) { |
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| 88 | params = p+1; |
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| 89 | /* find end of the clientparams*/ |
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| 90 | for(;*p;p++) {if(p[0] == RBRACKET && p[1] != LBRACKET) break;} |
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| 91 | if(*p == 0) goto fail; /* malformed client params*/ |
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| 92 | *p = '\0'; /* leave off the trailing rbracket for now */ |
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| 93 | p++; /* move past the params*/ |
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| 94 | } |
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| 95 | |
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| 96 | /* verify that the uri starts with an acceptable protocol*/ |
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| 97 | for(pp=legalprotocols;*pp;pp++) { |
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| 98 | if(strncmp(p,*pp,strlen(*pp))==0) break; |
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| 99 | } |
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| 100 | if(*pp == NULL) goto fail; /* illegal protocol*/ |
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| 101 | /* save the protocol */ |
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| 102 | protocol = *pp; |
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| 103 | |
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| 104 | /* 4. skip protocol */ |
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| 105 | p += strlen(protocol); |
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| 106 | |
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| 107 | /* 5. skip // */ |
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| 108 | if(*p != '/' && *(p+1) != '/') |
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| 109 | goto fail; |
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| 110 | p += 2; |
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| 111 | |
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| 112 | /* 6. Mark the end of the host section */ |
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| 113 | file = strchr(p,'/'); |
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| 114 | if(file) { |
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| 115 | *file++ = '\0'; /* warning: we just overwrote the leading / */ |
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| 116 | } else |
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| 117 | goto fail; /* url only has host part, no path */ |
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| 118 | |
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| 119 | /* 7. extract any user:pwd */ |
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| 120 | p1 = strchr(p,'@'); |
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| 121 | if(p1) {/* Assume we have user:pwd@ */ |
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| 122 | *p1 = '\0'; |
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| 123 | user = p; |
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| 124 | pwd = strchr(p,':'); |
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| 125 | if(!pwd) goto fail; /* malformed */ |
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| 126 | *pwd++ = '\0'; |
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| 127 | p = pwd+strlen(pwd)+1; |
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| 128 | } |
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| 129 | |
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| 130 | /* 8. extract host and port */ |
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| 131 | host = p; |
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| 132 | port = strchr(p,':'); |
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| 133 | if(port) { |
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| 134 | *port++ = '\0'; |
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| 135 | } |
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| 136 | |
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| 137 | /* 9. Look for '?' */ |
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| 138 | constraint = strchr(file,'?'); |
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| 139 | if(constraint) { |
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| 140 | *constraint++ = '\0'; |
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| 141 | } |
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| 142 | |
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| 143 | /* assemble the component pieces*/ |
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| 144 | if(uri0 && strlen(uri0) > 0) |
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| 145 | nc_uri->uri = strdup(uri0); |
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| 146 | if(protocol && strlen(protocol) > 0) { |
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| 147 | nc_uri->protocol = strdup(protocol); |
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| 148 | /* remove trailing ':' */ |
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| 149 | nc_uri->protocol[strlen(protocol)-1] = '\0'; |
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| 150 | } |
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| 151 | if(user && strlen(user) > 0) |
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| 152 | nc_uri->user = strdup(user); |
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| 153 | if(pwd && strlen(pwd) > 0) |
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| 154 | nc_uri->password = strdup(pwd); |
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| 155 | if(host && strlen(host) > 0) |
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| 156 | nc_uri->host = strdup(host); |
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| 157 | if(port && strlen(port) > 0) |
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| 158 | nc_uri->port = strdup(port); |
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| 159 | if(file && strlen(file) > 0) { |
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| 160 | /* Add back the leading / */ |
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| 161 | nc_uri->file = malloc(strlen(file)+2); |
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| 162 | strcpy(nc_uri->file,"/"); |
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| 163 | strcat(nc_uri->file,file); |
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| 164 | } |
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| 165 | if(constraint && strlen(constraint) > 0) |
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| 166 | nc_uri->constraint = strdup(constraint); |
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| 167 | nc_urisetconstraints(nc_uri,constraint); |
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| 168 | if(params != NULL && strlen(params) > 0) { |
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| 169 | nc_uri->params = (char*)malloc(1+2+strlen(params)); |
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| 170 | strcpy(nc_uri->params,"["); |
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| 171 | strcat(nc_uri->params,params); |
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| 172 | strcat(nc_uri->params,"]"); |
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| 173 | } |
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| 174 | |
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| 175 | #ifdef NC_XDEBUG |
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| 176 | { |
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| 177 | fprintf(stderr,"nc_uri:"); |
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| 178 | fprintf(stderr," params=|%s|",FIX(nc_uri->params)); |
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| 179 | fprintf(stderr," protocol=|%s|",FIX(nc_uri->protocol)); |
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| 180 | fprintf(stderr," host=|%s|",FIX(nc_uri->host)); |
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| 181 | fprintf(stderr," port=|%s|",FIX(nc_uri->port)); |
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| 182 | fprintf(stderr," file=|%s|",FIX(nc_uri->file)); |
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| 183 | fprintf(stderr," constraint=|%s|",FIX(nc_uri->constraint)); |
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| 184 | fprintf(stderr,"\n"); |
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| 185 | } |
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| 186 | #endif |
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| 187 | free(uri); |
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| 188 | if(nc_urip != NULL) *nc_urip = nc_uri; |
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| 189 | return 1; |
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| 190 | |
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| 191 | fail: |
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| 192 | if(nc_uri) nc_urifree(nc_uri); |
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| 193 | if(uri != NULL) free(uri); |
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| 194 | return 0; |
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| 195 | } |
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| 196 | |
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| 197 | void |
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| 198 | nc_urifree(NC_URI* nc_uri) |
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| 199 | { |
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| 200 | if(nc_uri == NULL) return; |
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| 201 | if(nc_uri->uri != NULL) {free(nc_uri->uri);} |
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| 202 | if(nc_uri->protocol != NULL) {free(nc_uri->protocol);} |
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| 203 | if(nc_uri->user != NULL) {free(nc_uri->user);} |
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| 204 | if(nc_uri->password != NULL) {free(nc_uri->password);} |
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| 205 | if(nc_uri->host != NULL) {free(nc_uri->host);} |
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| 206 | if(nc_uri->port != NULL) {free(nc_uri->port);} |
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| 207 | if(nc_uri->file != NULL) {free(nc_uri->file);} |
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| 208 | if(nc_uri->constraint != NULL) {free(nc_uri->constraint);} |
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| 209 | if(nc_uri->projection != NULL) {free(nc_uri->projection);} |
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| 210 | if(nc_uri->selection != NULL) {free(nc_uri->selection);} |
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| 211 | if(nc_uri->params != NULL) {free(nc_uri->params);} |
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| 212 | if(nc_uri->paramlist != NULL) nc_paramfree(nc_uri->paramlist); |
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| 213 | free(nc_uri); |
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| 214 | } |
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| 215 | |
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| 216 | /* Replace the constraints */ |
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| 217 | void |
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| 218 | nc_urisetconstraints(NC_URI* duri,const char* constraints) |
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| 219 | { |
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| 220 | char* proj = NULL; |
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| 221 | char* select = NULL; |
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| 222 | const char* p; |
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| 223 | |
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| 224 | if(duri->constraint == NULL) free(duri->constraint); |
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| 225 | if(duri->projection != NULL) free(duri->projection); |
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| 226 | if(duri->selection != NULL) free(duri->selection); |
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| 227 | duri->constraint = NULL; |
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| 228 | duri->projection = NULL; |
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| 229 | duri->selection = NULL; |
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| 230 | |
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| 231 | if(constraints == NULL || strlen(constraints)==0) return; |
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| 232 | |
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| 233 | duri->constraint = strdup(constraints); |
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| 234 | if(*duri->constraint == '?') |
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| 235 | strcpy(duri->constraint,duri->constraint+1); |
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| 236 | |
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| 237 | p = duri->constraint; |
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| 238 | proj = (char*) p; |
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| 239 | select = strchr(proj,'&'); |
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| 240 | if(select != NULL) { |
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| 241 | size_t plen = (select - proj); |
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| 242 | if(plen == 0) { |
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| 243 | proj = NULL; |
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| 244 | } else { |
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| 245 | proj = (char*)malloc(plen+1); |
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| 246 | memcpy((void*)proj,p,plen); |
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| 247 | proj[plen] = '\0'; |
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| 248 | } |
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| 249 | select = nulldup(select); |
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| 250 | } else { |
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| 251 | proj = nulldup(proj); |
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| 252 | select = NULL; |
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| 253 | } |
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| 254 | duri->projection = proj; |
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| 255 | duri->selection = select; |
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| 256 | } |
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| 257 | |
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| 258 | |
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| 259 | /* Construct a complete NC_ URI without the client params |
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| 260 | and optionally with the constraints; |
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| 261 | caller frees returned string |
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| 262 | */ |
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| 263 | |
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| 264 | char* |
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| 265 | nc_uribuild(NC_URI* duri, const char* prefix, const char* suffix, int pieces) |
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| 266 | { |
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| 267 | size_t len = 0; |
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| 268 | char* newuri; |
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| 269 | int withparams = ((pieces&NC_URIPARAMS) |
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| 270 | && duri->params != NULL); |
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| 271 | int withuserpwd = ((pieces&NC_URIUSERPWD) |
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| 272 | && duri->user != NULL && duri->password != NULL); |
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| 273 | int withconstraints = ((pieces&NC_URICONSTRAINTS) |
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| 274 | && duri->constraint != NULL); |
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| 275 | |
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| 276 | if(prefix != NULL) len += NILLEN(prefix); |
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| 277 | if(withparams) { |
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| 278 | len += NILLEN(duri->params); |
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| 279 | } |
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| 280 | len += (NILLEN(duri->protocol)+NILLEN("://")); |
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| 281 | if(withuserpwd) { |
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| 282 | len += (NILLEN(duri->user)+NILLEN(duri->password)+NILLEN(":@")); |
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| 283 | } |
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| 284 | len += (NILLEN(duri->host)); |
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| 285 | if(duri->port != NULL) { |
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| 286 | len += (NILLEN(":")+NILLEN(duri->port)); |
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| 287 | } |
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| 288 | len += (NILLEN(duri->file)); |
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| 289 | if(suffix != NULL) len += NILLEN(suffix); |
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| 290 | if(withconstraints) { |
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| 291 | len += (NILLEN("?")+NILLEN(duri->constraint)); |
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| 292 | } |
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| 293 | len += 1; /* null terminator */ |
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| 294 | |
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| 295 | newuri = (char*)malloc(len); |
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| 296 | if(!newuri) return NULL; |
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| 297 | |
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| 298 | newuri[0] = '\0'; |
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| 299 | if(prefix != NULL) strcat(newuri,prefix); |
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| 300 | if(withparams) { |
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| 301 | strcat(newuri,duri->params); |
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| 302 | } |
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| 303 | strcat(newuri,duri->protocol); |
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| 304 | strcat(newuri,"://"); |
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| 305 | if(withuserpwd) { |
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| 306 | strcat(newuri,duri->user); |
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| 307 | strcat(newuri,":"); |
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| 308 | strcat(newuri,duri->password); |
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| 309 | strcat(newuri,"@"); |
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| 310 | } |
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| 311 | if(duri->host != NULL) { /* may be null if using file: protocol */ |
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| 312 | strcat(newuri,duri->host); |
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| 313 | } |
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| 314 | if(duri->port != NULL) { |
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| 315 | strcat(newuri,":"); |
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| 316 | strcat(newuri,duri->port); |
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| 317 | } |
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| 318 | strcat(newuri,duri->file); |
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| 319 | if(suffix != NULL) strcat(newuri,suffix); |
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| 320 | if(withconstraints) { |
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| 321 | strcat(newuri,"?"); |
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| 322 | strcat(newuri,duri->constraint); |
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| 323 | } |
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| 324 | return newuri; |
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| 325 | } |
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| 326 | |
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| 327 | /**************************************************/ |
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| 328 | /* Parameter support */ |
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| 329 | |
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| 330 | /* |
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| 331 | Client parameters are assumed to be |
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| 332 | one or more instances of bracketed pairs: |
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| 333 | e.g "[...][...]...". |
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| 334 | The bracket content in turn is assumed to be a |
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| 335 | comma separated list of <name>=<value> pairs. |
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| 336 | e.g. x=y,z=,a=b. |
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| 337 | If the same parameter is specifed more than once, |
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| 338 | then the first occurrence is used; this is so that |
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| 339 | is possible to forcibly override user specified |
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| 340 | parameters by prefixing. |
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| 341 | IMPORTANT: client parameter string is assumed to |
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| 342 | have blanks compress out. |
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| 343 | Returns 1 if parse suceeded, 0 otherwise; |
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| 344 | */ |
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| 345 | |
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| 346 | int |
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| 347 | nc_uridecodeparams(NC_URI* nc_uri) |
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| 348 | { |
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| 349 | char* cp; |
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| 350 | char* cq; |
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| 351 | int c; |
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| 352 | int i; |
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| 353 | int nparams; |
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| 354 | char* params0; |
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| 355 | char* params; |
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| 356 | char* params1; |
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| 357 | char** plist; |
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| 358 | |
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| 359 | if(nc_uri == NULL) return 0; |
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| 360 | if(nc_uri->params == NULL) return 1; |
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| 361 | |
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| 362 | params0 = nc_uri->params; |
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| 363 | |
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| 364 | /* Pass 1 to replace beginning '[' and ending ']' */ |
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| 365 | if(params0[0] == '[') |
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| 366 | params = strdup(params0+1); |
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| 367 | else |
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| 368 | params = strdup(params0); |
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| 369 | |
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| 370 | if(params[strlen(params)-1] == ']') |
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| 371 | params[strlen(params)-1] = '\0'; |
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| 372 | |
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| 373 | /* Pass 2 to replace "][" pairs with ','*/ |
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| 374 | params1 = strdup(params); |
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| 375 | cp=params; cq = params1; |
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| 376 | while((c=*cp++)) { |
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| 377 | if(c == RBRACKET && *cp == LBRACKET) {cp++; c = ',';} |
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| 378 | *cq++ = c; |
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| 379 | } |
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| 380 | *cq = '\0'; |
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| 381 | free(params); |
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| 382 | params = params1; |
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| 383 | |
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| 384 | /* Pass 3 to break string into pieces and count # of pairs */ |
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| 385 | nparams=0; |
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| 386 | for(cp=params;(c=*cp);cp++) { |
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| 387 | if(c == ',') {*cp = '\0'; nparams++;} |
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| 388 | } |
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| 389 | nparams++; /* for last one */ |
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| 390 | |
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| 391 | /* plist is an env style list */ |
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| 392 | plist = (char**)calloc(1,sizeof(char*)*(2*nparams+1)); /* +1 for null termination */ |
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| 393 | |
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| 394 | /* Pass 4 to break up each pass into a (name,value) pair*/ |
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| 395 | /* and insert into the param list */ |
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| 396 | /* parameters of the form name name= are converted to name=""*/ |
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| 397 | cp = params; |
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| 398 | for(i=0;i<nparams;i++) { |
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| 399 | char* next = cp+strlen(cp)+1; /* save ptr to next pair*/ |
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| 400 | char* vp; |
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| 401 | /*break up the ith param*/ |
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| 402 | vp = strchr(cp,'='); |
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| 403 | if(vp != NULL) {*vp = '\0'; vp++;} else {vp = "";} |
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| 404 | plist[2*i] = strdup(cp); |
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| 405 | plist[2*i+1] = strdup(vp); |
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| 406 | cp = next; |
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| 407 | } |
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| 408 | plist[2*nparams] = NULL; |
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| 409 | free(params); |
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| 410 | if(nc_uri->paramlist != NULL) |
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| 411 | nc_paramfree(nc_uri->paramlist); |
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| 412 | nc_uri->paramlist = plist; |
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| 413 | return 1; |
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| 414 | } |
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| 415 | |
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| 416 | int |
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| 417 | nc_urilookup(NC_URI* uri, const char* key, const char** resultp) |
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| 418 | { |
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| 419 | int i; |
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| 420 | char* value = NULL; |
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| 421 | if(uri == NULL || key == NULL || uri->params == NULL) return 0; |
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| 422 | if(uri->paramlist == NULL) { |
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| 423 | i = nc_uridecodeparams(uri); |
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| 424 | if(!i) return 0; |
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| 425 | } |
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| 426 | i = nc_find(uri->paramlist,key); |
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| 427 | if(i < 0) return 0; |
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| 428 | value = uri->paramlist[(2*i)+1]; |
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| 429 | if(resultp) *resultp = value; |
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| 430 | return 1; |
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| 431 | } |
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| 432 | |
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| 433 | int |
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| 434 | nc_urisetparams(NC_URI* uri, const char* newparams) |
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| 435 | { |
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| 436 | if(uri == NULL) return 0; |
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| 437 | if(uri->paramlist != NULL) nc_paramfree(uri->paramlist); |
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| 438 | uri->paramlist = NULL; |
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| 439 | if(uri->params != NULL) free(uri->params); |
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| 440 | uri->params = nulldup(newparams); |
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| 441 | return 1; |
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| 442 | } |
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| 443 | |
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| 444 | /* Internal version of lookup; returns the paired index of the key */ |
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| 445 | static int |
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| 446 | nc_find(char** params, const char* key) |
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| 447 | { |
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| 448 | int i; |
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| 449 | char** p; |
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| 450 | for(i=0,p=params;*p;p+=2,i++) { |
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| 451 | if(strcmp(key,*p)==0) return i; |
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| 452 | } |
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| 453 | return -1; |
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| 454 | } |
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| 455 | |
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| 456 | static void |
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| 457 | nc_paramfree(char** params) |
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| 458 | { |
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| 459 | char** p; |
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| 460 | if(params == NULL) return; |
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| 461 | for(p=params;*p;p+=2) { |
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| 462 | free(*p); |
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| 463 | if(p[1] != NULL) free(p[1]); |
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| 464 | } |
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| 465 | free(params); |
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| 466 | } |
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