From f00ba92ed2cc1a9c24ad783e83525d1b5a85b857 Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Tue, 13 Sep 2016 11:43:06 +0200
Subject: Initial

---
 modules/changes/changes.js | 163 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 modules/changes/changes.js

(limited to 'modules/changes/changes.js')

diff --git a/modules/changes/changes.js b/modules/changes/changes.js
new file mode 100644
index 0000000..6a8c8f2
--- /dev/null
+++ b/modules/changes/changes.js
@@ -0,0 +1,163 @@
+"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]]}
+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();
+}
+
+function refreshURLs(){
+	var hashes={};
+	var i;
+	var url;
+	var timeout=null;
+	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];
+			} else {
+				var hash=crypto.createHash("sha256");
+				hash.update(body);
+				hashes[url]=[new Date(),hash.digest("hex")];
+			}
+
+			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(timeout)clearTimeout(timeout);
+			timeout=setTimeout(function(){
+				persist.setItemSync("urls",urls);
+				console.log("(persisted after refresh)")
+			},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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