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