git.m6w6.name Git - m6w6/ext-http/blob - http_date_api.c

   1 /*
   2    +----------------------------------------------------------------------+
   3    | PECL :: http                                                         |
   4    +----------------------------------------------------------------------+
   5    | This source file is subject to version 3.0 of the PHP license, that  |
   6    | is bundled with this package in the file LICENSE, and is available   |
   7    | through the world-wide-web at http://www.php.net/license/3_0.txt.    |
   8    | If you did not receive a copy of the PHP license and are unable to   |
   9    | obtain it through the world-wide-web, please send a note to          |
  10    | license@php.net so we can mail you a copy immediately.               |
  11    +----------------------------------------------------------------------+
  12    | Copyright (c) 2004-2005 Michael Wallner <mike@php.net>               |
  13    +----------------------------------------------------------------------+
  14 */
  15
  16 /* $Id$ */
  17
  18 #ifdef HAVE_CONFIG_H
  19 #       include "config.h"
  20 #endif
  21 #include "php.h"
  22
  23 #include "php_http.h"
  24 #include "php_http_std_defs.h"
  25
  26 #include <ctype.h>
  27
  28 static int check_day(char *day, size_t len);
  29 static int check_month(char *month);
  30 static int check_tzone(char *tzone);
  31
  32 /* {{{ day/month names */
  33 static const char *days[] = {
  34         "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
  35 };
  36 static const char *wkdays[] = {
  37         "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"
  38 };
  39 static const char *weekdays[] = {
  40         "Monday", "Tuesday", "Wednesday",
  41         "Thursday", "Friday", "Saturday", "Sunday"
  42 };
  43 static const char *months[] = {
  44         "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  45         "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  46 };
  47 enum assume_next {
  48         DATE_MDAY,
  49         DATE_YEAR,
  50         DATE_TIME
  51 };
  52 #define DS -60
  53 static const struct time_zone {
  54         const char *name;
  55         const int offset;
  56 } time_zones[] = {
  57     {"GMT", 0},     /* Greenwich Mean */
  58     {"UTC", 0},     /* Universal (Coordinated) */
  59     {"WET", 0},     /* Western European */
  60     {"BST", 0 DS}, /* British Summer */
  61     {"WAT", 60},    /* West Africa */
  62     {"AST", 240},   /* Atlantic Standard */
  63     {"ADT", 240 DS},/* Atlantic Daylight */
  64     {"EST", 300},   /* Eastern Standard */
  65     {"EDT", 300 DS},/* Eastern Daylight */
  66     {"CST", 360},   /* Central Standard */
  67     {"CDT", 360 DS},/* Central Daylight */
  68     {"MST", 420},   /* Mountain Standard */
  69     {"MDT", 420 DS},/* Mountain Daylight */
  70     {"PST", 480},   /* Pacific Standard */
  71     {"PDT", 480 DS},/* Pacific Daylight */
  72     {"YST", 540},   /* Yukon Standard */
  73     {"YDT", 540 DS},/* Yukon Daylight */
  74     {"HST", 600},   /* Hawaii Standard */
  75     {"HDT", 600 DS},/* Hawaii Daylight */
  76     {"CAT", 600},   /* Central Alaska */
  77     {"AHST", 600},  /* Alaska-Hawaii Standard */
  78     {"NT",  660},   /* Nome */
  79     {"IDLW", 720},  /* International Date Line West */
  80     {"CET", -60},   /* Central European */
  81     {"MET", -60},   /* Middle European */
  82     {"MEWT", -60},  /* Middle European Winter */
  83     {"MEST", -60 DS},/* Middle European Summer */
  84     {"CEST", -60 DS},/* Central European Summer */
  85     {"MESZ", -60 DS},/* Middle European Summer */
  86     {"FWT", -60},   /* French Winter */
  87     {"FST", -60 DS},/* French Summer */
  88     {"EET", -120},  /* Eastern Europe, USSR Zone 1 */
  89     {"WAST", -420}, /* West Australian Standard */
  90     {"WADT", -420 DS},/* West Australian Daylight */
  91     {"CCT", -480},  /* China Coast, USSR Zone 7 */
  92     {"JST", -540},  /* Japan Standard, USSR Zone 8 */
  93     {"EAST", -600}, /* Eastern Australian Standard */
  94     {"EADT", -600 DS},/* Eastern Australian Daylight */
  95     {"GST", -600},  /* Guam Standard, USSR Zone 9 */
  96     {"NZT", -720},  /* New Zealand */
  97     {"NZST", -720}, /* New Zealand Standard */
  98     {"NZDT", -720 DS},/* New Zealand Daylight */
  99     {"IDLE", -720}, /* International Date Line East */
 100 };
 101 /* }}} */
 102
 103 /* {{{ Day/Month/TZ checks for http_parse_date()
 104         Originally by libcurl, Copyright (C) 1998 - 2004, Daniel Stenberg, <daniel@haxx.se>, et al. */
 105 static int check_day(char *day, size_t len)
 106 {
 107         int i;
 108         const char * const *check = (len > 3) ? &weekdays[0] : &wkdays[0];
 109         for (i = 0; i < 7; i++) {
 110             if (!strcmp(day, check[0])) {
 111                 return i;
 112                 }
 113                 check++;
 114         }
 115         return -1;
 116 }
 117
 118 static int check_month(char *month)
 119 {
 120         int i;
 121         const char * const *check = &months[0];
 122         for (i = 0; i < 12; i++) {
 123                 if (!strcmp(month, check[0])) {
 124                         return i;
 125                 }
 126                 check++;
 127         }
 128         return -1;
 129 }
 130
 131 /* return the time zone offset between GMT and the input one, in number
 132    of seconds or -1 if the timezone wasn't found/legal */
 133
 134 static int check_tzone(char *tzone)
 135 {
 136         unsigned i;
 137         const struct time_zone *check = time_zones;
 138         for (i = 0; i < sizeof(time_zones) / sizeof(time_zones[0]); i++) {
 139                 if (!strcmp(tzone, check->name)) {
 140                         return check->offset * 60;
 141                 }
 142                 check++;
 143         }
 144         return -1;
 145 }
 146 /* }}} */
 147
 148 /* {{{ char *http_date(time_t) */
 149 PHP_HTTP_API char *_http_date(time_t t TSRMLS_DC)
 150 {
 151         struct tm *gmtime, tmbuf;
 152
 153         if (gmtime = php_gmtime_r(&t, &tmbuf)) {
 154                 char *date = ecalloc(1, 31);
 155                 snprintf(date, 30,
 156                         "%s, %02d %s %04d %02d:%02d:%02d GMT",
 157                         days[gmtime->tm_wday], gmtime->tm_mday,
 158                         months[gmtime->tm_mon], gmtime->tm_year + 1900,
 159                         gmtime->tm_hour, gmtime->tm_min, gmtime->tm_sec
 160                 );
 161                 return date;
 162         }
 163
 164         return NULL;
 165 }
 166 /* }}} */
 167
 168 /* {{{ time_t http_parse_date(char *)
 169         Originally by libcurl, Copyright (C) 1998 - 2004, Daniel Stenberg, <daniel@haxx.se>, et al. */
 170 PHP_HTTP_API time_t _http_parse_date(const char *date)
 171 {
 172         time_t t = 0;
 173         int tz_offset = -1, year = -1, month = -1, monthday = -1, weekday = -1,
 174                 hours = -1, minutes = -1, seconds = -1;
 175         struct tm tm;
 176         enum assume_next dignext = DATE_MDAY;
 177         const char *indate = date;
 178
 179         int part = 0; /* max 6 parts */
 180
 181         while (*date && (part < 6)) {
 182                 int found = 0;
 183
 184                 while (*date && !isalnum(*date)) {
 185                         date++;
 186                 }
 187
 188                 if (isalpha(*date)) {
 189                         /* a name coming up */
 190                         char buf[32] = "";
 191                         size_t len;
 192                         sscanf(date, "%31[A-Za-z]", buf);
 193                         len = strlen(buf);
 194
 195                         if (weekday == -1) {
 196                                 weekday = check_day(buf, len);
 197                                 if (weekday != -1) {
 198                                         found = 1;
 199                                 }
 200                         }
 201
 202                         if (!found && (month == -1)) {
 203                                 month = check_month(buf);
 204                                 if (month != -1) {
 205                                         found = 1;
 206                                 }
 207                         }
 208
 209                         if (!found && (tz_offset == -1)) {
 210                                 /* this just must be a time zone string */
 211                                 tz_offset = check_tzone(buf);
 212                                 if (tz_offset != -1) {
 213                                         found = 1;
 214                                 }
 215                         }
 216
 217                         if (!found) {
 218                                 return -1; /* bad string */
 219                         }
 220                         date += len;
 221                 }
 222                 else if (isdigit(*date)) {
 223                         /* a digit */
 224                         int val;
 225                         char *end;
 226                         if ((seconds == -1) &&
 227                                 (3 == sscanf(date, "%02d:%02d:%02d", &hours, &minutes, &seconds))) {
 228                                 /* time stamp! */
 229                                 date += 8;
 230                                 found = 1;
 231                         }
 232                         else {
 233                                 val = (int) strtol(date, &end, 10);
 234
 235                                 if ((tz_offset == -1) && ((end - date) == 4) && (val < 1300) &&
 236                                         (indate < date) && ((date[-1] == '+' || date[-1] == '-'))) {
 237                                         /* four digits and a value less than 1300 and it is preceeded with
 238                                         a plus or minus. This is a time zone indication. */
 239                                         found = 1;
 240                                         tz_offset = (val / 100 * 60 + val % 100) * 60;
 241
 242                                         /* the + and - prefix indicates the local time compared to GMT,
 243                                         this we need ther reversed math to get what we want */
 244                                         tz_offset = date[-1] == '+' ? -tz_offset : tz_offset;
 245                                 }
 246
 247                                 if (((end - date) == 8) && (year == -1) && (month == -1) && (monthday == -1)) {
 248                                         /* 8 digits, no year, month or day yet. This is YYYYMMDD */
 249                                         found = 1;
 250                                         year = val / 10000;
 251                                         month = (val % 10000) / 100 - 1; /* month is 0 - 11 */
 252                                         monthday = val % 100;
 253                                 }
 254
 255                                 if (!found && (dignext == DATE_MDAY) && (monthday == -1)) {
 256                                         if ((val > 0) && (val < 32)) {
 257                                                 monthday = val;
 258                                                 found = 1;
 259                                         }
 260                                         dignext = DATE_YEAR;
 261                                 }
 262
 263                                 if (!found && (dignext == DATE_YEAR) && (year == -1)) {
 264                                         year = val;
 265                                         found = 1;
 266                                         if (year < 1900) {
 267                                                 year += year > 70 ? 1900 : 2000;
 268                                         }
 269                                         if(monthday == -1) {
 270                                                 dignext = DATE_MDAY;
 271                                         }
 272                                 }
 273
 274                                 if (!found) {
 275                                         return -1;
 276                                 }
 277
 278                                 date = end;
 279                         }
 280                 }
 281
 282                 part++;
 283         }
 284
 285         if (-1 == seconds) {
 286                 seconds = minutes = hours = 0; /* no time, make it zero */
 287         }
 288
 289         if ((-1 == monthday) || (-1 == month) || (-1 == year)) {
 290                 /* lacks vital info, fail */
 291                 return -1;
 292         }
 293
 294         if (sizeof(time_t) < 5) {
 295                 /* 32 bit time_t can only hold dates to the beginning of 2038 */
 296                 if (year > 2037) {
 297                         return 0x7fffffff;
 298                 }
 299         }
 300
 301         tm.tm_sec = seconds;
 302         tm.tm_min = minutes;
 303         tm.tm_hour = hours;
 304         tm.tm_mday = monthday;
 305         tm.tm_mon = month;
 306         tm.tm_year = year - 1900;
 307         tm.tm_wday = 0;
 308         tm.tm_yday = 0;
 309         tm.tm_isdst = 0;
 310
 311         t = mktime(&tm);
 312
 313         /* time zone adjust */
 314         if (t != -1) {
 315                 struct tm *gmt, keeptime2;
 316                 long delta;
 317                 time_t t2;
 318
 319                 if(!(gmt = php_gmtime_r(&t, &keeptime2))) {
 320                         return -1; /* illegal date/time */
 321                 }
 322
 323                 t2 = mktime(gmt);
 324
 325                 /* Add the time zone diff (between the given timezone and GMT) and the
 326                 diff between the local time zone and GMT. */
 327                 delta = (tz_offset != -1 ? tz_offset : 0) + (t - t2);
 328
 329                 if((delta > 0) && (t + delta < t)) {
 330                         return -1; /* time_t overflow */
 331                 }
 332
 333                 t += delta;
 334         }
 335
 336         return t;
 337 }
 338 /* }}} */
 339
 340
 341 /*
 342  * Local variables:
 343  * tab-width: 4
 344  * c-basic-offset: 4
 345  * End:
 346  * vim600: sw=4 ts=4 fdm=marker
 347  * vim<600: sw=4 ts=4
 348  */
 349