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[mod_magnet] lighty.c.header_tokens convenience fn 

lighty.c.header_tokens convenience func to create a sequence table
of tokens parsed from a given string, e.g. an HTTP header.  The purpose
of this routine is to made it easier to properly parse an HTTP header
into tokens since token separators can be part of quoted-strings, and
they are not token separators when part of quoted strings.

The sequence table t returned from lighty.c.header_tokens() can be
walked with:
  for i = 1, #t do
    -- <body here>
  end
While walking, each element can be passed to lighty.c.quoteddec()
to decode, as non-quoted-string elements are returned as-is.

Note: lighty.c.header_tokens() returns a sequence table,
      which is different from lighty.c.cookie_tokens(),
      which returns a key/value table of cookies.
personal/stbuehler/tests-path
Glenn Strauss 2022-02-21 01:21:14 -05:00
parent 94c952bd1c
commit 1b56d7cf5b
1 changed files with 45 additions and 0 deletions
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45
src/mod_magnet.c
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@ -1318,6 +1318,50 @@ static int magnet_cookie_tokens(lua_State *L) {
return 1;
}
static const char * magnet_push_token(lua_State *L, const char *s) {
const char *b = s;
while ( *s!=' ' && *s!='\t' && *s!='\r' && *s!='\n'
&& *s!=',' && *s!=';' && *s!='=' && *s)
++s;
lua_pushlstring(L, b, (size_t)(s-b));
return s;
}
static int magnet_header_tokens(lua_State *L) {
/* split into sequence of tokens/words
* Intermediate table is then more convenient to walk once quoted-string
* parsed into table entries since quoted-string may contain separators.
* Each token can be passed to lighty.c.quoteddec()
* (lighty.c.quoteddec() returns string as-is if not quoted-string)
* (note: non-validating;
* e.g. existence of '=' token does not mean that next token is value,
* and '=' in value which is not part of quoted-string will be
* treated as separate token)
* (note: case is preserved; non-quoted-string tokens are not lower-cased)
* (words separated by whitespace are separate tokens unless quoted-string)
* (if that format not permitted in a specific header, caller must detect)
* (optional whitespace (OWS) and bad whitespace (BWS) are removed)
* (caller can create lookup table from sequence table, as appropriate) */
lua_createtable(L, 0, 0);
if (lua_isnoneornil(L, 1))
return 1;
const char *s = luaL_checkstring(L, 1);
int i = 0;
do {
while ( *s==' ' || *s=='\t' || *s=='\r' || *s=='\n')
++s;
if (*s=='\0') break;
if (*s==',' || *s==';' || *s=='=')
lua_pushlstring(L, s++, 1);
else if (*s != '"')
s = magnet_push_token(L, s);
else
s = magnet_push_quoted_string(L, s);
lua_rawseti(L, -2, ++i);
} while (*s);
return 1;
}
static int magnet_atpanic(lua_State *L) {
request_st * const r = magnet_get_request(L);
log_error(r->conf.errh, __FILE__, __LINE__, "(lua-atpanic) %s",
@ -2361,6 +2405,7 @@ static void magnet_init_lighty_table(lua_State * const L) {
,{ "urlenc_normalize", magnet_urlenc_normalize }/* url-enc normalization */
,{ "fspath_simplify", magnet_fspath_simplify } /* simplify fspath */
,{ "cookie_tokens", magnet_cookie_tokens } /* parse cookie tokens */
,{ "header_tokens", magnet_header_tokens } /* parse header tokens seq */
,{ "readdir", magnet_readdir } /* dir walk */
,{ "quoteddec", magnet_quoteddec } /* quoted-string decode */
,{ "quotedenc", magnet_quotedenc } /* quoted-string encode */