1 files changed, 131 insertions, 0 deletions

diff --git a/lib/util.cc b/lib/util.cc
index 26be66a..eacf6d7 100644
--- a/lib/util.cc
+++ b/lib/util.cc
@@ -1,164 +1,295 @@
 #include <errno.h>
 #include <cassert>
+#include <cctype>
 #include <cstring>
 #include <vector>
 #include <string>
+#include <stack>
 #include <openssl/bio.h>
 #include <openssl/evp.h>
 #include <curl/curl.h>
 #include "opkele/util.h"
 #include "opkele/exception.h"
 
 namespace opkele {
     using namespace std;
 
     namespace util {
 
         /*
          * base64
          */
         string encode_base64(const void *data,size_t length) {
             BIO *b64 = 0, *bmem = 0;
             try {
                 b64 = BIO_new(BIO_f_base64());
                 if(!b64)
                     throw exception_openssl(OPKELE_CP_ "failed to BIO_new() base64 encoder");
                 BIO_set_flags(b64,BIO_FLAGS_BASE64_NO_NL);
                 bmem = BIO_new(BIO_s_mem());
                 BIO_set_flags(b64,BIO_CLOSE);
                 if(!bmem)
                     throw exception_openssl(OPKELE_CP_ "failed to BIO_new() memory buffer");
                 BIO_push(b64,bmem);
                 if(((size_t)BIO_write(b64,data,length))!=length)
                     throw exception_openssl(OPKELE_CP_ "failed to BIO_write()");
                 if(BIO_flush(b64)!=1)
                     throw exception_openssl(OPKELE_CP_ "failed to BIO_flush()");
                 char *rvd;
                 long rvl = BIO_get_mem_data(bmem,&rvd);
                 string rv(rvd,rvl);
                 BIO_free_all(b64);
                 return rv;
             }catch(...) {
                 if(b64) BIO_free_all(b64);
                 throw;
             }
         }
 
         void decode_base64(const string& data,vector<unsigned char>& rv) {
             BIO *b64 = 0, *bmem = 0;
             rv.clear();
             try {
                 bmem = BIO_new_mem_buf((void*)data.data(),data.size());
                 if(!bmem)
                     throw exception_openssl(OPKELE_CP_ "failed to BIO_new_mem_buf()");
                 b64 = BIO_new(BIO_f_base64());
                 if(!b64)
                     throw exception_openssl(OPKELE_CP_ "failed to BIO_new() base64 decoder");
                 BIO_set_flags(b64,BIO_FLAGS_BASE64_NO_NL);
                 BIO_push(b64,bmem);
                 unsigned char tmp[512];
                 size_t rb = 0;
                 while((rb=BIO_read(b64,tmp,sizeof(tmp)))>0)
                     rv.insert(rv.end(),tmp,&tmp[rb]);
                 BIO_free_all(b64);
             }catch(...) {
                 if(b64) BIO_free_all(b64);
                 throw;
             }
         }
 
         /*
          * big numerics
          */
 
         BIGNUM *base64_to_bignum(const string& b64) {
             vector<unsigned char> bin;
             decode_base64(b64,bin);
             BIGNUM *rv = BN_bin2bn(&(bin.front()),bin.size(),0);
             if(!rv)
                 throw failed_conversion(OPKELE_CP_ "failed to BN_bin2bn()");
             return rv;
         }
 
         BIGNUM *dec_to_bignum(const string& dec) {
             BIGNUM *rv = 0;
             if(!BN_dec2bn(&rv,dec.c_str()))
                 throw failed_conversion(OPKELE_CP_ "failed to BN_dec2bn()");
             return rv;
         }
 
         string bignum_to_base64(const BIGNUM *bn) {
             vector<unsigned char> bin(BN_num_bytes(bn)+1);
             unsigned char *binptr = &(bin.front())+1;
             int l = BN_bn2bin(bn,binptr);
             if(l && (*binptr)&0x80){
                 (*(--binptr)) = 0; ++l;
             }
             return encode_base64(binptr,l);
         }
 
         /*
          * w3c times
          */
 
         string time_to_w3c(time_t t) {
             struct tm tm_t;
             if(!gmtime_r(&t,&tm_t))
                 throw failed_conversion(OPKELE_CP_ "failed to BN_dec2bn()");
             char rv[25];
             if(!strftime(rv,sizeof(rv)-1,"%Y-%m-%dT%H:%M:%SZ",&tm_t))
                 throw failed_conversion(OPKELE_CP_ "failed to strftime()");
             return rv;
         }
 
         time_t w3c_to_time(const string& w) {
             struct tm tm_t;
             memset(&tm_t,0,sizeof(tm_t));
             if(
                     sscanf(
                         w.c_str(),
                         "%04d-%02d-%02dT%02d:%02d:%02dZ",
                         &tm_t.tm_year,&tm_t.tm_mon,&tm_t.tm_mday,
                         &tm_t.tm_hour,&tm_t.tm_min,&tm_t.tm_sec
                     ) != 6 )
                 throw failed_conversion(OPKELE_CP_ "failed to sscanf()");
             tm_t.tm_mon--;
             tm_t.tm_year-=1900;
             time_t rv = mktime(&tm_t);
             if(rv==(time_t)-1)
                 throw failed_conversion(OPKELE_CP_ "failed to mktime()");
             return rv;
         }
 
         /*
          *
          */
 
         string url_encode(const string& str) {
             char * t = curl_escape(str.c_str(),str.length());
             if(!t)
                 throw failed_conversion(OPKELE_CP_ "failed to curl_escape()");
             string rv(t);
             curl_free(t);
             return rv;
         }
 
         string long_to_string(long l) {
             char rv[32];
             int r=snprintf(rv,sizeof(rv),"%ld",l);
             if(r<0 || r>=(int)sizeof(rv))
                 throw failed_conversion(OPKELE_CP_ "failed to snprintf()");
             return rv;
         }
 
         long string_to_long(const string& s) {
             char *endptr = 0;
             long rv = strtol(s.c_str(),&endptr,10);
             if((!endptr) || endptr==s.c_str())
                 throw failed_conversion(OPKELE_CP_ "failed to strtol()");
             return rv;
         }
 
+        /*
+         * Normalize URL according to the rules, described in rfc 3986, section 6
+         *
+         * - uppercase hext triplets (e.g. %ab -> %AB)
+         * - lowercase scheme and host
+         * - decode %-encoded characters, specified as unreserved in rfc 3986, section 2.3,
+         *   that is - [:alpha:][:digit:]._~-
+         * - remove dot segments
+         * - remove empty and default ports
+         * - if there's no path component, add '/'
+         */
+         string rfc_3986_normalize_uri(const string& uri) {
+             string rv;
+             string::size_type colon = uri.find(':');
+             if(colon==string::npos)
+                 throw bad_input(OPKELE_CP_ "No scheme specified in URI");
+             transform(
+                     uri.begin(), uri.begin()+colon+1,
+                     back_inserter(rv), ::tolower );
+             bool s;
+             if(rv=="http:")
+                 s = false;
+             else if(rv=="https:")
+                 s = true;
+             else
+                 throw not_implemented(OPKELE_CP_ "Only http(s) URIs can be normalized here");
+             string::size_type ul = uri.length();
+             if(ul <= (colon+3))
+                 throw bad_input(OPKELE_CP_ "Unexpected end of URI being normalized encountered");
+             if(uri[colon+1]!='/' || uri[colon+2]!='/')
+                 throw bad_input(OPKELE_CP_ "Unexpected input in URI being normalized after scheme component");
+             rv += "//";
+             string::size_type interesting = uri.find_first_of(":/#?",colon+3);
+             if(interesting==string::npos) {
+                 transform(
+                         uri.begin()+colon+3,uri.end(),
+                         back_inserter(rv), ::tolower );
+                 rv += '/'; return rv;
+             }
+             transform(
+                     uri.begin()+colon+3,uri.begin()+interesting,
+                     back_inserter(rv), ::tolower );
+             bool qf = false;
+             char ic = uri[interesting];
+             if(ic==':') {
+                 string::size_type ni = uri.find_first_of("/#?%",interesting+1);
+                 const char *nptr = uri.data()+interesting+1;
+                 char *eptr = 0;
+                 long port = strtol(nptr,&eptr,10);
+                 if( (port>0) && (port<65535) && port!=(s?443:80) ) {
+                     char tmp[6];
+                     snprintf(tmp,sizeof(tmp),"%d",port);
+                     rv += ':'; rv += tmp;
+                 }
+                 if(ni==string::npos) {
+                     rv += '/'; return rv;
+                 }
+                 interesting = ni;
+             }else if(ic!='/') {
+                 rv += '/'; rv += ic;
+                 qf = true;
+                 ++interesting;
+             }
+             string::size_type n = interesting;
+             char tmp[3] = { 0,0,0 };
+             stack<string::size_type> psegs; psegs.push(rv.length());
+             string pseg;
+             for(;n<ul;) {
+                 string::size_type unsafe = uri.find_first_of(qf?"%":"%/?#",n);
+                 if(unsafe==string::npos) {
+                     pseg.append(uri,n,ul-n-1); n = ul-1;
+                 }else{
+                     pseg.append(uri,n,unsafe-n);
+                     n = unsafe;
+                 }
+                 char c = uri[n++];
+                 if(c=='%') {
+                     if((n+1)>=ul)
+                         throw bad_input(OPKELE_CP_ "Unexpected end of URI encountered while parsing percent-encoded character");
+                     tmp[0] = uri[n++];
+                     tmp[1] = uri[n++];
+                     if(!( isxdigit(tmp[0]) && isxdigit(tmp[1]) ))
+                         throw bad_input(OPKELE_CP_ "Invalid percent-encoded character in URI being normalized");
+                     int cc = strtol(tmp,0,16);
+                     if( isalpha(cc) || isdigit(cc) || strchr("._~-",cc) )
+                         pseg += cc;
+                     else{
+                         pseg += '%';
+                         pseg += toupper(tmp[0]); pseg += toupper(tmp[1]);
+                     }
+                 }else if(qf) {
+                     rv += pseg; rv += c;
+                     pseg.clear();
+                 }else if(n>=ul || strchr("?/#",c)) {
+                     if(pseg.empty() || pseg==".") {
+                     }else if(pseg=="..") {
+                         if(psegs.size()>1) {
+                             rv.resize(psegs.top()); psegs.pop();
+                         }
+                     }else{
+                         psegs.push(rv.length());
+                         if(c!='/') {
+                             pseg += c;
+                             qf = true;
+                         }
+                         rv += '/'; rv += pseg;
+                     }
+                     if(c=='/' && (n>=ul || strchr("?#",uri[n])) ) {
+                         rv += '/';
+                         if(n<ul)
+                             qf = true;
+                     }else if(strchr("?#",c)) {
+                         if(psegs.size()==1 && psegs.top()==rv.length())
+                             rv += '/';
+                         if(pseg.empty())
+                             rv += c;
+                         qf = true;
+                     }
+                     pseg.clear();
+                 }else{
+                     pseg += c;
+                 }
+             }
+             if(!pseg.empty()) {
+                 rv += '/'; rv += pseg;
+             }
+             return rv;
+         }
+
     }
 
 }