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

   1 /*
   2     +--------------------------------------------------------------------+
   3     | PECL :: http                                                       |
   4     +--------------------------------------------------------------------+
   5     | Redistribution and use in source and binary forms, with or without |
   6     | modification, are permitted provided that the conditions mentioned |
   7     | in the accompanying LICENSE file are met.                          |
   8     +--------------------------------------------------------------------+
   9     | Copyright (c) 2004-2005, Michael Wallner <mike@php.net>            |
  10     +--------------------------------------------------------------------+
  11 */
  12
  13 /* $Id$ */
  14
  15 #ifdef HAVE_CONFIG_H
  16 #       include "config.h"
  17 #endif
  18
  19 #include "php_http.h"
  20 #include "php_http_api.h"
  21 #include "php_http_date_api.h"
  22
  23 static inline int check_day(const char *day, size_t len);
  24 static inline int check_month(const char *month);
  25 static inline int check_tzone(const char *tzone);
  26 static inline time_t parse_date(const char *month);
  27
  28 /* {{{ day/month names */
  29 static const char *days[] = {
  30         "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
  31 };
  32 static const char *wkdays[] = {
  33         "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"
  34 };
  35 static const char *weekdays[] = {
  36         "Monday", "Tuesday", "Wednesday",
  37         "Thursday", "Friday", "Saturday", "Sunday"
  38 };
  39 static const char *months[] = {
  40         "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  41         "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  42 };
  43 enum assume_next {
  44         DATE_MDAY,
  45         DATE_YEAR,
  46         DATE_TIME
  47 };
  48 #define DS -60
  49 static const struct time_zone {
  50         const char *name;
  51         const int offset;
  52 } time_zones[] = {
  53     {"GMT", 0},     /* Greenwich Mean */
  54     {"UTC", 0},     /* Universal (Coordinated) */
  55     {"WET", 0},     /* Western European */
  56     {"BST", 0 DS}, /* British Summer */
  57     {"WAT", 60},    /* West Africa */
  58     {"AST", 240},   /* Atlantic Standard */
  59     {"ADT", 240 DS},/* Atlantic Daylight */
  60     {"EST", 300},   /* Eastern Standard */
  61     {"EDT", 300 DS},/* Eastern Daylight */
  62     {"CST", 360},   /* Central Standard */
  63     {"CDT", 360 DS},/* Central Daylight */
  64     {"MST", 420},   /* Mountain Standard */
  65     {"MDT", 420 DS},/* Mountain Daylight */
  66     {"PST", 480},   /* Pacific Standard */
  67     {"PDT", 480 DS},/* Pacific Daylight */
  68     {"YST", 540},   /* Yukon Standard */
  69     {"YDT", 540 DS},/* Yukon Daylight */
  70     {"HST", 600},   /* Hawaii Standard */
  71     {"HDT", 600 DS},/* Hawaii Daylight */
  72     {"CAT", 600},   /* Central Alaska */
  73     {"AHST", 600},  /* Alaska-Hawaii Standard */
  74     {"NT",  660},   /* Nome */
  75     {"IDLW", 720},  /* International Date Line West */
  76     {"CET", -60},   /* Central European */
  77     {"MET", -60},   /* Middle European */
  78     {"MEWT", -60},  /* Middle European Winter */
  79     {"MEST", -60 DS},/* Middle European Summer */
  80     {"CEST", -60 DS},/* Central European Summer */
  81     {"MESZ", -60 DS},/* Middle European Summer */
  82     {"FWT", -60},   /* French Winter */
  83     {"FST", -60 DS},/* French Summer */
  84     {"EET", -120},  /* Eastern Europe, USSR Zone 1 */
  85     {"WAST", -420}, /* West Australian Standard */
  86     {"WADT", -420 DS},/* West Australian Daylight */
  87     {"CCT", -480},  /* China Coast, USSR Zone 7 */
  88     {"JST", -540},  /* Japan Standard, USSR Zone 8 */
  89     {"EAST", -600}, /* Eastern Australian Standard */
  90     {"EADT", -600 DS},/* Eastern Australian Daylight */
  91     {"GST", -600},  /* Guam Standard, USSR Zone 9 */
  92     {"NZT", -720},  /* New Zealand */
  93     {"NZST", -720}, /* New Zealand Standard */
  94     {"NZDT", -720 DS},/* New Zealand Daylight */
  95     {"IDLE", -720}, /* International Date Line East */
  96 };
  97 /* }}} */
  98
  99 /* {{{ Day/Month/TZ checks for http_parse_date()
 100         Originally by libcurl, Copyright (C) 1998 - 2004, Daniel Stenberg, <daniel@haxx.se>, et al. */
 101 static inline int check_day(const char *day, size_t len)
 102 {
 103         int i;
 104         const char * const *check = (len > 3) ? &weekdays[0] : &wkdays[0];
 105         for (i = 0; i < 7; i++) {
 106             if (!strcmp(day, check[0])) {
 107                 return i;
 108                 }
 109                 check++;
 110         }
 111         return -1;
 112 }
 113
 114 static inline int check_month(const char *month)
 115 {
 116         int i;
 117         const char * const *check = &months[0];
 118         for (i = 0; i < 12; i++) {
 119                 if (!strcmp(month, check[0])) {
 120                         return i;
 121                 }
 122                 check++;
 123         }
 124         return -1;
 125 }
 126
 127 /* return the time zone offset between GMT and the input one, in number
 128    of seconds or -1 if the timezone wasn't found/legal */
 129
 130 static inline int check_tzone(const char *tzone)
 131 {
 132         unsigned i;
 133         const struct time_zone *check = time_zones;
 134         for (i = 0; i < sizeof(time_zones) / sizeof(time_zones[0]); i++) {
 135                 if (!strcmp(tzone, check->name)) {
 136                         return check->offset * 60;
 137                 }
 138                 check++;
 139         }
 140         return -1;
 141 }
 142 /* }}} */
 143
 144 /* {{{ char *http_date(time_t) */
 145 PHP_HTTP_API char *_http_date(time_t t TSRMLS_DC)
 146 {
 147         struct tm *gmtime, tmbuf;
 148
 149         if ((gmtime = php_gmtime_r(&t, &tmbuf))) {
 150                 char *date = ecalloc(1, 31);
 151                 snprintf(date, 30,
 152                         "%s, %02d %s %04d %02d:%02d:%02d GMT",
 153                         days[gmtime->tm_wday], gmtime->tm_mday,
 154                         months[gmtime->tm_mon], gmtime->tm_year + 1900,
 155                         gmtime->tm_hour, gmtime->tm_min, gmtime->tm_sec
 156                 );
 157                 return date;
 158         }
 159
 160         return NULL;
 161 }
 162 /* }}} */
 163
 164 /* {{{ time_t http_parse_date(char *) */
 165 PHP_HTTP_API time_t _http_parse_date(const char *date TSRMLS_DC)
 166 {
 167         time_t t = -1;
 168
 169 #ifdef PHP_WIN32
 170         /* fix odd offsets with Win32 */
 171         char tzput[64] = "TZ=";
 172         const char *tzget = NULL;
 173
 174         if ((tzget = getenv("TZ"))) {
 175                 strlcat(tzput, tzget, 63);
 176         }
 177         putenv("TZ=GMT");
 178 #endif
 179
 180         t = parse_date(date);
 181
 182 #ifdef PHP_WIN32
 183         putenv(tzput);
 184 #endif
 185
 186         if (-1 == t) {
 187                 http_error_ex(HE_NOTICE, HTTP_E_RUNTIME, "Could not parse date: %s", date);
 188         }
 189
 190         return t;
 191 }
 192 /* }}} */
 193
 194 /*      time_t parse_date(char *)
 195         Originally by libcurl, Copyright (C) 1998 - 2004, Daniel Stenberg, <daniel@haxx.se>, et al. */
 196 static inline time_t parse_date(const char *date)
 197 {
 198         time_t t = 0;
 199         int tz_offset = -1, year = -1, month = -1, monthday = -1, weekday = -1,
 200                 hours = -1, minutes = -1, seconds = -1;
 201         struct tm tm;
 202         enum assume_next dignext = DATE_MDAY;
 203         const char *indate = date;
 204
 205         int part = 0; /* max 6 parts */
 206
 207         while (*date && (part < 6)) {
 208                 int found = 0;
 209
 210                 while (*date && !isalnum(*date)) {
 211                         date++;
 212                 }
 213
 214                 if (isalpha(*date)) {
 215                         /* a name coming up */
 216                         char buf[32] = "";
 217                         size_t len;
 218                         sscanf(date, "%31[A-Za-z]", buf);
 219                         len = strlen(buf);
 220
 221                         if (weekday == -1) {
 222                                 weekday = check_day(buf, len);
 223                                 if (weekday != -1) {
 224                                         found = 1;
 225                                 }
 226                         }
 227
 228                         if (!found && (month == -1)) {
 229                                 month = check_month(buf);
 230                                 if (month != -1) {
 231                                         found = 1;
 232                                 }
 233                         }
 234
 235                         if (!found && (tz_offset == -1)) {
 236                                 /* this just must be a time zone string */
 237                                 tz_offset = check_tzone(buf);
 238                                 if (tz_offset != -1) {
 239                                         found = 1;
 240                                 }
 241                         }
 242
 243                         if (!found) {
 244                                 return -1; /* bad string */
 245                         }
 246                         date += len;
 247                 }
 248                 else if (isdigit(*date)) {
 249                         /* a digit */
 250                         int val;
 251                         char *end;
 252                         if ((seconds == -1) &&
 253                                 (3 == sscanf(date, "%02d:%02d:%02d", &hours, &minutes, &seconds))) {
 254                                 /* time stamp! */
 255                                 date += 8;
 256                                 found = 1;
 257                         }
 258                         else {
 259                                 val = (int) strtol(date, &end, 10);
 260
 261                                 if ((tz_offset == -1) && ((end - date) == 4) && (val < 1300) &&
 262                                         (indate < date) && ((date[-1] == '+' || date[-1] == '-'))) {
 263                                         /* four digits and a value less than 1300 and it is preceeded with
 264                                         a plus or minus. This is a time zone indication. */
 265                                         found = 1;
 266                                         tz_offset = (val / 100 * 60 + val % 100) * 60;
 267
 268                                         /* the + and - prefix indicates the local time compared to GMT,
 269                                         this we need ther reversed math to get what we want */
 270                                         tz_offset = date[-1] == '+' ? -tz_offset : tz_offset;
 271                                 }
 272
 273                                 if (((end - date) == 8) && (year == -1) && (month == -1) && (monthday == -1)) {
 274                                         /* 8 digits, no year, month or day yet. This is YYYYMMDD */
 275                                         found = 1;
 276                                         year = val / 10000;
 277                                         month = (val % 10000) / 100 - 1; /* month is 0 - 11 */
 278                                         monthday = val % 100;
 279                                 }
 280
 281                                 if (!found && (dignext == DATE_MDAY) && (monthday == -1)) {
 282                                         if ((val > 0) && (val < 32)) {
 283                                                 monthday = val;
 284                                                 found = 1;
 285                                         }
 286                                         dignext = DATE_YEAR;
 287                                 }
 288
 289                                 if (!found && (dignext == DATE_YEAR) && (year == -1)) {
 290                                         year = val;
 291                                         found = 1;
 292                                         if (year < 1900) {
 293                                                 year += year > 70 ? 1900 : 2000;
 294                                         }
 295                                         if(monthday == -1) {
 296                                                 dignext = DATE_MDAY;
 297                                         }
 298                                 }
 299
 300                                 if (!found) {
 301                                         return -1;
 302                                 }
 303
 304                                 date = end;
 305                         }
 306                 }
 307
 308                 part++;
 309         }
 310
 311         if (-1 == seconds) {
 312                 seconds = minutes = hours = 0; /* no time, make it zero */
 313         }
 314
 315         if ((-1 == monthday) || (-1 == month) || (-1 == year)) {
 316                 /* lacks vital info, fail */
 317                 return -1;
 318         }
 319
 320         if (sizeof(time_t) < 5) {
 321                 /* 32 bit time_t can only hold dates to the beginning of 2038 */
 322                 if (year > 2037) {
 323                         return 0x7fffffff;
 324                 }
 325         }
 326
 327         tm.tm_sec = seconds;
 328         tm.tm_min = minutes;
 329         tm.tm_hour = hours;
 330         tm.tm_mday = monthday;
 331         tm.tm_mon = month;
 332         tm.tm_year = year - 1900;
 333         tm.tm_wday = 0;
 334         tm.tm_yday = 0;
 335         tm.tm_isdst = 0;
 336
 337         t = mktime(&tm);
 338
 339         /* time zone adjust */
 340         if (t != -1) {
 341                 struct tm *gmt, keeptime2;
 342                 long delta;
 343                 time_t t2;
 344
 345                 if(!(gmt = php_gmtime_r(&t, &keeptime2))) {
 346                         return -1; /* illegal date/time */
 347                 }
 348
 349                 t2 = mktime(gmt);
 350
 351                 /* Add the time zone diff (between the given timezone and GMT) and the
 352                 diff between the local time zone and GMT. */
 353                 delta = (tz_offset != -1 ? tz_offset : 0) + (t - t2);
 354
 355                 if((delta > 0) && (t + delta < t)) {
 356                         return -1; /* time_t overflow */
 357                 }
 358
 359                 t += delta;
 360         }
 361
 362         return t;
 363 }
 364 /* }}} */
 365
 366
 367 /*
 368  * Local variables:
 369  * tab-width: 4
 370  * c-basic-offset: 4
 371  * End:
 372  * vim600: sw=4 ts=4 fdm=marker
 373  * vim<600: sw=4 ts=4
 374  */
 375