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implement Contents;
include "sys.m";
sys: Sys;
dbg_log : ref Sys->FD;
include "draw.m";
include "bufio.m";
bufio: Bufio;
Iobuf : import bufio;
include "contents.m";
include "cache.m";
include "httpd.m";
include "string.m";
str : String;
Suffix: adt{
suffix : string;
generic : string;
specific : string;
encoding : string;
};
suffixes: list of Suffix;
#internal functions...
parsesuffix : fn(nil:string): (int,Suffix);
mkcontent(generic,specific : string): ref Content
{
c:= ref Content;
c.generic = generic;
c.specific = specific;
c.q = real 1;
return c;
}
badmod(m: string)
{
sys->fprint(stderr(), "contents: cannot load %s: %r\n", m);
raise "fail:bad module";
}
contentinit(log: ref Sys->FD)
{
if(suffixes != nil)
return;
sys = load Sys Sys->PATH;
bufio = load Bufio Bufio->PATH;
if (bufio == nil) badmod(Bufio->PATH);
str = load String String->PATH;
if (str == nil) badmod(String->PATH);
iob := bufio->open(Httpd->HTTP_SUFF, bufio->OREAD);
if (iob==nil) {
sys->fprint(stderr(), "contents: cannot open %s: %r\n", Httpd->HTTP_SUFF);
raise "fail:no suffix file";;
}
while((s := iob.gets('\n'))!=nil) {
(i, su) := parsesuffix(s);
if (i != 0)
suffixes = su :: suffixes;
}
dbg_log = log;
}
# classify by file name extensions
uriclass(name : string): (ref Content, ref Content)
{
s : Suffix;
typ, enc: ref Content;
p : string;
lis := suffixes;
typ=nil;
enc=nil;
uri:=name;
(nil,p) = str->splitr(name,"/");
if (p!=nil) name=p;
if(str->in('.',name)){
(nil,p) = str->splitl(name,".");
for(s = hd lis; lis!=nil; lis = tl lis){
if(p == s.suffix){
if(s.generic != nil && typ==nil)
typ = mkcontent(s.generic, s.specific);
if(s.encoding != nil && enc==nil)
enc = mkcontent(s.encoding, "");
}
s = hd lis;
}
}
if(typ == nil && enc == nil){
buff := array[64] of byte;
fd := sys->open(uri, sys->OREAD);
n := sys->read(fd, buff, len buff);
if(n > 0){
tmp := string buff[0:n];
(typ, enc) = dataclass(tmp);
}
}
return (typ, enc);
}
parsesuffix(line: string): (int, Suffix)
{
s : Suffix;
if (str->in('#',line))
(line,nil) = str->splitl(line, "#");
if (line!=nil){
(n,slist):=sys->tokenize(line,"\n\t ");
if (n!=4 && n!=0){
if (dbg_log!=nil)
sys->fprint(dbg_log,"Error in suffixes file!, n=%d\n",n);
sys->print("Error in suffixes file!, n=%d\n",n);
exit;
}
s.suffix = hd slist;
slist = tl slist;
s.generic = hd slist;
if (s.generic == "-") s.generic="";
slist = tl slist;
s.specific = hd slist;
if (s.specific == "-") s.specific="";
slist = tl slist;
s.encoding = hd slist;
if (s.encoding == "-") s.encoding="";
}
if (((s.generic == "")||(s.specific == "")) && s.encoding=="")
return (0,s);
return (1,s);
}
#classify by initial contents of file
dataclass(buf : string): (ref Content,ref Content)
{
c,n : int;
c=0;
n = len buf;
for(; n > 0; n --){
if(buf[c] < 16r80)
if(buf[c] < 32 && buf[c] != '\n' && buf[c] != '\r'
&& buf[c] != '\t' && buf[c] != '\v')
return (nil,nil);
c++;
}
return (mkcontent("text", "plain"),nil);
}
checkcontent(me: ref Content,oks :list of ref Content, clist : string): int
{
ok:=oks;
try : ref Content;
if(oks == nil || me == nil)
return 1;
for(; ok != nil; ok = tl ok){
try = hd ok;
if((try.generic==me.generic || try.generic=="*")
&& (try.specific==me.specific || try.specific=="*")){
return 1;
}
}
sys->fprint(dbg_log,"%s/%s not found",
me.generic, me.specific);
logcontent(clist, oks);
return 1;
}
logcontent(name : string, c : list of ref Content)
{
buf : string;
if (dbg_log!=nil){
for(; c!=nil; c = tl c)
buf+=sys->sprint("%s/%s ", (hd c).generic,(hd c).specific);
sys->fprint(dbg_log,"%s: %s: %s", "client", name, buf);
}
}
stderr(): ref Sys->FD
{
return sys->fildes(2);
}
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