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** hash. If the request contained an If-None-Match header which matches
** the generated ETag, then a 304 Not Modified reply is generated and
** the process exits. In other words, etag_check() never returns. But
** if there is no If-None_Match header or if the ETag does not match,
** then etag_check() returns normally. Later, during reply generation,
** the cgi.c module will invoke etag_tag() to recover the generated tag
** and include it in the reply header.
*/
#include "config.h"
#include "etag.h"
#if INTERFACE
/*
** Things to monitor
*/
#define ETAG_CONFIG 0x01 /* Output depends on the CONFIG table */
#define ETAG_DATA 0x02 /* Output depends on the EVENT table */
#define ETAG_COOKIE 0x04 /* Output depends on a display cookie value */
#define ETAG_HASH 0x08 /* Output depends on a hash */
#endif
static char zETag[33]; /* The generated ETag */
static int iMaxAge = 0; /* The max-age parameter in the reply */
/*
** Generate an ETag
*/
void etag_check(unsigned eFlags, const char *zHash){
sqlite3_int64 mtime;
const char *zIfNoneMatch;
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** hash. If the request contained an If-None-Match header which matches
** the generated ETag, then a 304 Not Modified reply is generated and
** the process exits. In other words, etag_check() never returns. But
** if there is no If-None_Match header or if the ETag does not match,
** then etag_check() returns normally. Later, during reply generation,
** the cgi.c module will invoke etag_tag() to recover the generated tag
** and include it in the reply header.
**
** 2018-02-25:
**
** Also support Last-Modified: and If-Modified-Since:. The
** etag_last_modified(mtime) API records a timestamp for the page in
** seconds since 1970. This causes a Last-Modified: header to be
** issued in the reply. Or, if the request contained If-Modified-Since:
** and the new mtime is not greater than the mtime associated with
** If-Modified-Since, then a 304 Not Modified reply is generated and
** the etag_last_modified() API never returns.
*/
#include "config.h"
#include "etag.h"
#if INTERFACE
/*
** Things to monitor
*/
#define ETAG_CONFIG 0x01 /* Output depends on the CONFIG table */
#define ETAG_DATA 0x02 /* Output depends on the EVENT table */
#define ETAG_COOKIE 0x04 /* Output depends on a display cookie value */
#define ETAG_HASH 0x08 /* Output depends on a hash */
#endif
static char zETag[33]; /* The generated ETag */
static int iMaxAge = 0; /* The max-age parameter in the reply */
static sqlite3_int64 iEtagMtime = 0; /* Last-Modified time */
/*
** Generate an ETag
*/
void etag_check(unsigned eFlags, const char *zHash){
sqlite3_int64 mtime;
const char *zIfNoneMatch;
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/* If we get this far, it means that the content has
** not changed and we can do a 304 reply */
cgi_reset_content();
cgi_set_status(304, "Not Modified");
cgi_reply();
fossil_exit(0);
}
/* Return the ETag, if there is one.
*/
const char *etag_tag(void){
return zETag;
}
/* Return the recommended max-age
*/
int etag_maxage(void){
return iMaxAge;
}
/*
** COMMAND: test-etag
**
** Usage: fossil test-etag -key KEY-NUMBER -hash HASH
**
** Generate an etag given a KEY-NUMBER and/or a HASH.
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/* If we get this far, it means that the content has
** not changed and we can do a 304 reply */
cgi_reset_content();
cgi_set_status(304, "Not Modified");
cgi_reply();
fossil_exit(0);
}
/*
** Accept a new Last-Modified time. This routine should be called by
** page generators that know a valid last-modified time. This routine
** might generate a 304 Not Modified reply and exit(), never returnning.
** Or, if not, it will cause a Last-Modified: header to be included in the
** reply.
*/
void etag_last_modified(sqlite3_int64 mtime){
const char *zIfModifiedSince;
sqlite3_int64 x, exeMtime;
assert( iEtagMtime==0 ); /* Only call this routine once */
assert( mtime>0 ); /* Only call with a valid mtime */
iEtagMtime = mtime;
/* Check to see the If-Modified-Since constraint is satisfied */
zIfModifiedSince = P("HTTP_IF_MODIFIED_SINCE");
if( zIfModifiedSince==0 ) return;
x = cgi_rfc822_parsedate(zIfModifiedSince);
if( x<=0 || x>mtime ) return;
/* If the Fossil executable is more recent than If-Modified-Since,
** go ahead and regenerate the resource. */
exeMtime = file_mtime(g.nameOfExe, ExtFILE);
if( exeMtime>x ) return;
/* If we reach this point, it means that the resource has not changed
** and that we should generate a 304 Not Modified reply */
cgi_reset_content();
cgi_set_status(304, "Not Modified");
cgi_reply();
fossil_exit(0);
}
/* Return the ETag, if there is one.
*/
const char *etag_tag(void){
return zETag;
}
/* Return the recommended max-age
*/
int etag_maxage(void){
return iMaxAge;
}
/* Return the last-modified time in seconds since 1970. Or return 0 if
** there is no last-modified time.
*/
sqlite3_int64 etag_mtime(void){
return iEtagMtime;
}
/*
** COMMAND: test-etag
**
** Usage: fossil test-etag -key KEY-NUMBER -hash HASH
**
** Generate an etag given a KEY-NUMBER and/or a HASH.
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