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