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// ------------------------------------------------// File : html.cpp// Date: 4-apr-2002// Author: giles// Desc: // HTML protocol handling//// (c) 2002 peercast.org// ------------------------------------------------// This program is free software; you can redistribute it and/or modify// it under the terms of the GNU General Public License as published by// the Free Software Foundation; either version 2 of the License, or// (at your option) any later version.// This program is distributed in the hope that it will be useful,// but WITHOUT ANY WARRANTY; without even the implied warranty of// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the// GNU General Public License for more details.// ------------------------------------------------#include <stdarg.h>#include <stdlib.h>
#include "html.h"#include "http.h"#include "stream.h"#include "gnutella.h"#include "servmgr.h"#include "channel.h"#include "stats.h"// --------------------------------------HTML::HTML(const char *t, Stream &o){ out = &o; out->writeCRLF = false; title.set(t); tagLevel = 0; refresh = 0;}// --------------------------------------void HTML::writeOK(const char *content){ out->writeLine(HTTP_SC_OK); out->writeLine("%s %s",HTTP_HS_SERVER,PCX_AGENT); //out->writeLine("%s %s",HTTP_HS_CACHE,"no-cache"); out->writeLine("%s %s",HTTP_HS_CONNECTION,"close"); out->writeLine("%s %s",HTTP_HS_CONTENT,content);
out->writeLine("");}// --------------------------------------void HTML::writeVariable(Stream &s,const String &varName, int loop){ bool r=false; if (varName.startsWith("servMgr.")) r=servMgr->writeVariable(s,varName+8); else if (varName.startsWith("chanMgr.")) r=chanMgr->writeVariable(s,varName+8,loop); else if (varName.startsWith("stats.")) r=stats.writeVariable(s,varName+6);
else if (varName.startsWith("sys."))
{
if (varName == "sys.log.dumpHTML")
{
sys->logBuf->dumpHTML(s);
r=true;
}
}
else if (varName.startsWith("loop."))
{
if (varName.startsWith("loop.channel."))
{
Channel *ch = chanMgr->findChannelByIndex(loop);
if (ch)
r = ch->writeVariable(s,varName+13,loop);
}else if (varName.startsWith("loop.servent."))
{
Servent *sv = servMgr->findServentByIndex(loop);
if (sv)
r = sv->writeVariable(s,varName+13);
}else if (varName.startsWith("loop.filter."))
{
ServFilter *sf = &servMgr->filters[loop];
r = sf->writeVariable(s,varName+12);
}else if (varName == "loop.indexEven")
{
s.writeString("%d",(loop&1)==0);
r = true;
}else if (varName == "loop.index")
{
s.writeString("%d",loop);
r = true;
}else if (varName.startsWith("loop.hit."))
{
char *idstr = getCGIarg(tmplArgs,"id=");
if (idstr)
{
GnuID id;
id.fromStr(idstr);
ChanHitList *chl = chanMgr->findHitListByID(id);
if (chl)
r = chl->hits[loop].writeVariable(s,varName+9);
}
}
}
else if (varName.startsWith("page."))
{
if (varName.startsWith("page.channel."))
{
char *idstr = getCGIarg(tmplArgs,"id=");
if (idstr)
{
GnuID id;
id.fromStr(idstr);
Channel *ch = chanMgr->findChannelByID(id);
if (ch)
r = ch->writeVariable(s,varName+13,loop);
}
}else
{
String v = varName+5;
v.append('=');
char *a = getCGIarg(tmplArgs,v);
if (a)
{
s.writeString(a);
r=true;
}
}
}
if (!r) s.writeString(varName);}// --------------------------------------
int HTML::getIntVariable(const String &varName,int loop)
{
String val;
MemoryStream mem(val.cstr(),String::MAX_LEN);
writeVariable(mem,varName,loop);
return atoi(val.cstr());
}
// --------------------------------------
bool HTML::getBoolVariable(const String &varName,int loop)
{
String val;
MemoryStream mem(val.cstr(),String::MAX_LEN);
writeVariable(mem,varName,loop);
// integer
if ((val[0] >= '0') && (val[0] <= '9'))
return atoi(val.cstr()) != 0;
// string
if (val[0]!=0)
return true;
return false;
}
// --------------------------------------
void HTML::readIf(FileStream &in,Stream *outp,int loop)
{
String var;
bool varCond=true;
while (!in.eof())
{
char c = in.readChar();
if (c == '}')
{
if (getBoolVariable(var,loop)==varCond)
{
if (readTemplate(in,outp,loop))
readTemplate(in,NULL,loop);
}else{
if (readTemplate(in,NULL,loop))
readTemplate(in,outp,loop);
}
return;
}else if (c == '!')
{
varCond = !varCond;
}else
{
var.append(c);
}
}
}
// --------------------------------------
void HTML::readLoop(FileStream &in,Stream *outp,int loop)
{
String var;
while (!in.eof())
{
char c = in.readChar();
if (c == '}')
{
int cnt = getIntVariable(var,loop);
if (cnt)
{
int spos = in.pos();
for(int i=0; i<cnt; i++)
{
in.seekTo(spos);
readTemplate(in,outp,i);
}
}else
{
readTemplate(in,NULL,0);
}
return;
}else
{
var.append(c);
}
}
}
// --------------------------------------
int HTML::readCmd(FileStream &in,Stream *outp,int loop)
{
String cmd;
int tmpl = TMPL_UNKNOWN;
while (!in.eof())
{
char c = in.readChar();
if (String::isWhitespace(c) || (c=='}'))
{
if (cmd == "loop")
{
readLoop(in,outp,loop);
tmpl = TMPL_LOOP;
}else if (cmd == "if")
{
readIf(in,outp,loop);
tmpl = TMPL_IF;
}else if (cmd == "end")
{
tmpl = TMPL_END;
}
else if (cmd == "else")
{
tmpl = TMPL_ELSE;
}
break;
}else
{
cmd.append(c);
}
}
return tmpl;
}
// --------------------------------------
void HTML::readVariable(FileStream &in,Stream *outp,int loop)
{
String var;
while (!in.eof())
{
char c = in.readChar();
if (c == '}')
{
if (outp)
writeVariable(*outp,var,loop);
return;
}else
{
var.append(c);
}
}
}
// --------------------------------------
bool HTML::readTemplate(FileStream &in,Stream *outp,int loop)
{
while (!in.eof())
{
char c = in.readChar();
if (c == '{')
{
c = in.readChar();
if (c == '$')
{
readVariable(in,outp,loop);
}
else if (c == '@')
{
int t = readCmd(in,outp,loop);
if (t == TMPL_END)
return false;
else if (t == TMPL_ELSE)
return true;
}
else
throw StreamException("Unknown template escape");
}else
{
if (outp)
outp->writeChar(c);
}
}
return false;
}
// --------------------------------------void HTML::writeTemplate(const char *fileName, const char *args){
FileStream file; try { file.openReadOnly(fileName);
tmplArgs = args;
readTemplate(file,out,0);
}catch(StreamException &e) { out->writeString(e.msg); out->writeString(" : "); out->writeString(fileName);
} file.close();}// --------------------------------------
void HTML::writeRawFile(const char *fileName)
{
FileStream file;
try
{
file.openReadOnly(fileName);
file.writeTo(*out,file.length());
}catch(StreamException &)
{
}
file.close();
}
// --------------------------------------void HTML::locateTo(const char *url){ out->writeLine(HTTP_SC_FOUND); out->writeLine("Location: %s",url); out->writeLine("");}// --------------------------------------void HTML::startHTML(){ startNode("html");}// --------------------------------------void HTML::startBody(){ startNode("body");}// --------------------------------------void HTML::addHead(){ char buf[512]; startNode("head"); startTagEnd("title",title.cstr()); startTagEnd("meta http-equiv=\"Content-Type\" content=\"text/html; charset=iso-8859-1\""); if (!refreshURL.isEmpty()) { sprintf(buf,"meta http-equiv=\"refresh\" content=\"%d;URL=%s\"",refresh,refreshURL.cstr()); startTagEnd(buf); }else if (refresh) { sprintf(buf,"meta http-equiv=\"refresh\" content=\"%d\"",refresh); startTagEnd(buf); } end();}// --------------------------------------void HTML::addContent(const char *s){ out->writeString(s);}// --------------------------------------void HTML::startNode(const char *tag, const char *data){ const char *p = tag; char *o = &currTag[tagLevel][0]; int i; for(i=0; i<MAX_TAGLEN-1; i++) { char c = *p++; if ((c==0) || (c==' ')) break; else *o++ = c; } *o = 0; out->writeString("<"); out->writeString(tag); out->writeString(">"); if (data) out->writeString(data); tagLevel++; if (tagLevel >= MAX_TAGLEVEL) throw StreamException("HTML too deep!");}// --------------------------------------void HTML::end(){ tagLevel--; if (tagLevel < 0) throw StreamException("HTML premature end!"); out->writeString("</"); out->writeString(&currTag[tagLevel][0]); out->writeString(">");}// --------------------------------------void HTML::addLink(const char *url, const char *text, bool toblank){ char buf[1024]; sprintf(buf,"a href=\"%s\" %s",url,toblank?"target=\"_blank\"":""); startNode(buf,text); end();}// --------------------------------------void HTML::startTag(const char *tag, const char *fmt,...){ if (fmt) { va_list ap; va_start(ap, fmt); char tmp[512]; vsprintf(tmp,fmt,ap); startNode(tag,tmp); va_end(ap); }else{ startNode(tag,NULL); }}// --------------------------------------void HTML::startTagEnd(const char *tag, const char *fmt,...){ if (fmt) { va_list ap; va_start(ap, fmt); char tmp[512]; vsprintf(tmp,fmt,ap); startNode(tag,tmp); va_end(ap); }else{ startNode(tag,NULL); } end();}// --------------------------------------void HTML::startSingleTagEnd(const char *fmt,...){ va_list ap; va_start(ap, fmt); char tmp[512]; vsprintf(tmp,fmt,ap); startNode(tmp); va_end(ap); end();}// --------------------------------------void HTML::startTableRow(int i){ if (i & 1) startTag("tr bgcolor=\"#dddddd\" align=\"left\""); else startTag("tr bgcolor=\"#eeeeee\" align=\"left\"");}⌨️ 快捷键说明
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