summaryrefslogtreecommitdiffabout
path: root/lib/util.cc
blob: a9b9bedb37ae8e9b4f50cafb637317cfd77ae1c4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
#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) {
	    int fraction;
	    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
		) && (
		    sscanf(
			w.c_str(),
			"%04d-%02d-%02dT%02d:%02d:%02d.%03dZ",
			&tm_t.tm_year,&tm_t.tm_mon,&tm_t.tm_mday,
			&tm_t.tm_hour,&tm_t.tm_min,&tm_t.tm_sec,
			&fraction
			) != 7
		    ) )
		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-timezone;
	}

	/*
	 *
	 */

	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 hex 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) {
	     static const char *whitespace = " \t\r\n";
	     string rv;
	     string::size_type ns = uri.find_first_not_of(whitespace);
	     if(ns==string::npos)
		 throw bad_input(OPKELE_CP_ "Can't normalize empty URI");
	     string::size_type colon = uri.find(':',ns);
	     if(colon==string::npos)
		 throw bad_input(OPKELE_CP_ "No scheme specified in URI");
	     transform(
		     uri.begin()+ns, uri.begin()+colon+1,
		     back_inserter(rv), ::tolower );
	     bool s;
	     string::size_type ul = uri.find_last_not_of(whitespace)+1;
	     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");
	     if(rv=="http:")
		 s = false;
	     else if(rv=="https:")
		 s = true;
	     else{
		 /* TODO: support more schemes.
		  * e.g. xri. How do we normalize
		  * xri?
		  */
		 rv.append(uri,colon+1,ul-colon-1);
		 return rv;
	     }
	     rv += "//";
	     string::size_type interesting = uri.find_first_of(":/#?",colon+3);
	     if(interesting==string::npos) {
		 transform(
			 uri.begin()+colon+3,uri.begin()+ul,
			 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[8];
		     snprintf(tmp,sizeof(tmp),":%ld",port);
		     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()) {
		 if(!qf) rv += '/';
		 rv += pseg;
	     }
	     return rv;
	 }

    }

}