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"use strict";
var cmn=require("../$common.js"),
persist=require("node-persist"),
crypto=require("crypto"),
http=require("http"),
https=require("https"),
URL=require("url");
var moddir=null;
persist=persist.create({
dir:"persist/changes",
continuous:false,
interval:false
});
persist.initSync();
//urls: map(url => URLobject)
//url: String
//URLobject: {url, timeline: [[Date, hash, contents]]}
var urls=persist.getItemSync("urls");
if(!urls){
urls={};
persist.setItemSync("urls",urls);
}
function URLobject(url){
if(!(this instanceof URLobject))return new URLobject(url);
this.url=url;
this.timeline=[];
}
function fetch(method,url,data/*?*/,cb){
var cbcalled=false;
if(!cb){
cb=data;
data=undefined;
if(!cb)throw new Error("No callback passed to fetch");
}
try {
url=URL.parse(url);
} catch(e){
cb(-1,null);
return;
}
var httpclass;
switch(url.protocol){
case "http:": httpclass=http; break;
case "https:": httpclass=https; break;
default:
cb(-1,null);
return;
}
url.method=method;
var req=httpclass.request(url,function(res){
var body="";
res.on("data",function(data){
body+=data;
});
res.on("end",function(){
if(!cbcalled)cb(res.statusCode,body);
cbcalled=true;
});
res.on("error",function(err){
if(!cbcalled)cb(-1,err);
cbcalled=true;
});
});
req.on("error",function(err){
if(!cbcalled)cb(-1,err);
cbcalled=true;
});
if(data)req.write(data);
req.end();
}
var refresh_persist_timeout=null;
function refreshURLs(){
var hashes={};
var i;
var url;
for(url in urls){
console.log("Fetching <"+url+">");
fetch("GET",url,function(url,status,body){
console.log("Got <"+url+">; status = "+status);
if(status==-1){
hashes[url]=[new Date(),null,null];
} else {
var hash=crypto.createHash("sha256");
hash.update(body);
hashes[url]=[new Date(),hash.digest("hex"),body];
}
if(!urls[url]){
console.log("WARNING: url <"+url+"> from hashes not found in urls!");
return;
}
//var last=urls[url].timeline[urls[url].timeline.length-1];
//if(last==undefined||hashes[url][1]==null||hashes[url][1]!=last[1]){
urls[url].timeline.push(hashes[url]);
//}
if(refresh_persist_timeout!=null)clearTimeout(refresh_persist_timeout);
refresh_persist_timeout=setTimeout(function(){
persist.setItemSync("urls",urls);
console.log("(persisted after refresh)")
refresh_persist_timeout=null;
},2000);
}.bind(null,url));
}
}
module.exports=function(app,io,_moddir){
moddir=_moddir;
app.all(["/changes","/changes/*"],cmn.authgen());
app.get("/changes",function(req,res){
res.sendFile(moddir+"/changes.html");
});
app.get("/changes/urls",function(req,res){
var list=[];
var url;
for(url in urls)list.push(url);
res.send(JSON.stringify(list));
});
app.get("/changes/url",function(req,res){
var url=req.query.url;
if(!urls[url]){
res.status(404);
res.send("URL not found in watch list");
return;
}
res.send(JSON.stringify(urls[url]));
});
app.post("/changes/url",function(req,res){
var url=req.body;
urls[url]=new URLobject(url);
persist.setItemSync("urls",urls);
// refreshURLs();
res.send();
});
app.delete("/changes/url",function(req,res){
var url=req.body;
if(!urls[url]){
res.status(404);
res.send("URL not found in watch list");
return;
}
delete urls[url];
persist.setItemSync("urls",urls);
res.send();
});
app.post("/changes/refresh",function(req,res){
refreshURLs();
res.send();
});
};
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