From 80a60a2095d59111ee9be424e7ea8f505abb5f00 Mon Sep 17 00:00:00 2001
From: digital dreamer <digitaldreamer@email.cz>
Date: Sun, 25 May 2014 18:10:52 +0200
Subject: [PATCH] add RSS support

---
 Makefile.am         |   1 +
 src/bitcoinrpc.cpp  |  23 +++++
 src/twister_rss.cpp | 207 ++++++++++++++++++++++++++++++++++++++++++++
 src/twister_rss.h   |  18 ++++
 twister-qt.pro      |   2 +
 5 files changed, 251 insertions(+)
 create mode 100644 src/twister_rss.cpp
 create mode 100644 src/twister_rss.h

diff --git a/Makefile.am b/Makefile.am
index 4802e0b8..02c30aaf 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -157,6 +157,7 @@ BITCOIN_TWISTER_SOURCES = \
     src/txdb.cpp \
     src/chainparams.cpp \
     src/twister.cpp \
+    src/twister_rss.cpp \
     src/twister_utils.cpp \
     $(SSE2_SOURCES)
 
diff --git a/src/bitcoinrpc.cpp b/src/bitcoinrpc.cpp
index 2b53b3b2..7f16826a 100644
--- a/src/bitcoinrpc.cpp
+++ b/src/bitcoinrpc.cpp
@@ -13,6 +13,7 @@
 #include "db.h"
 
 #include "twister_utils.h"
+#include "twister_rss.h"
 
 #include <boost/algorithm/string.hpp>
 #include <boost/asio.hpp>
@@ -979,6 +980,28 @@ void ServiceConnection(AcceptedConnection *conn)
         if(strMethod == "GET" && strURI == "/")
             strURI="/home.html";
 
+        if(strMethod == "GET" && strURI.substr(0, 4) == "/rss" && !GetBoolArg("-public_server_mode",false))
+        {
+            string rssOutput;
+            int rssResult = generateRSS(strURI, &rssOutput);
+
+            switch(rssResult)
+            {
+                case RSS_OK:
+                    conn->stream() << HTTPReply(HTTP_OK, rssOutput, false, "application/rss+xml") << std::flush;
+                    continue;
+                case RSS_ERROR_NO_ACCOUNT:
+                    conn->stream() << HTTPReply(HTTP_BAD_REQUEST, "No accounts found - please register a username", false) << std::flush;
+                    continue;
+                case RSS_ERROR_BAD_ACCOUNT:
+                    conn->stream() << HTTPReply(HTTP_BAD_REQUEST, "Requested account is not registered on this node", false) << std::flush;
+                    continue;
+                case RSS_ERROR_NOT_A_NUMBER:
+                    conn->stream() << HTTPReply(HTTP_BAD_REQUEST, "Parameter 'max' must be a number", false) << std::flush;
+                    continue;
+            }
+        }
+
         if (strURI != "/" && strURI.find("..") == std::string::npos ) {
             filesystem::path pathFile = filesystem::path(GetHTMLDir()) / strURI;
             std::string fname = pathFile.string();
diff --git a/src/twister_rss.cpp b/src/twister_rss.cpp
new file mode 100644
index 00000000..91aacacb
--- /dev/null
+++ b/src/twister_rss.cpp
@@ -0,0 +1,207 @@
+#include "twister_rss.h"
+#include "init.h"
+#include "bitcoinrpc.h"
+#include "json/json_spirit.h"
+
+#include <sstream>
+#include <algorithm>
+#include <vector>
+#include <ctime>
+#include <boost/lexical_cast.hpp>
+
+using namespace std;
+using namespace json_spirit;
+
+int generateRSS(string uri, string *output)
+{
+    string account = "";
+    int max = 20;
+
+    // get URI parameters if available
+    size_t startPosition, endPosition;
+    if(uri.find("max=")!=string::npos)
+    {
+        startPosition = uri.find("max=")+4;
+        if(uri.find("&",startPosition)!=string::npos)
+            endPosition=uri.find("&",startPosition);
+        else
+            endPosition=uri.length();
+        try
+        {
+            max = boost::lexical_cast<int>(uri.substr(startPosition,endPosition-startPosition));
+        }
+        catch(boost::bad_lexical_cast e)
+        {
+            return RSS_ERROR_NOT_A_NUMBER;
+        }
+    }
+    if(uri.find("account=")!=string::npos)
+    {
+        startPosition = uri.find("account=")+8;
+        if(uri.find("&",startPosition)!=string::npos)
+            endPosition=uri.find("&",startPosition);
+        else
+            endPosition=uri.length();
+
+        account = uri.substr(startPosition,endPosition-startPosition);
+    }
+
+    const Array emptyArray;
+    Array accountsArray = listwalletusers(emptyArray,false).get_array();
+    
+    // if no account was specified, choose the first one
+    if(account=="")
+    {
+        if(accountsArray.size()>0)
+        {
+            account = accountsArray[0].get_str();
+        }
+        else return RSS_ERROR_NO_ACCOUNT;
+    }
+    
+    // if an account name was specified, check that it exists
+    else
+    {
+        bool accountExists = false;
+        for(int i=0;i<accountsArray.size();i++)
+        {
+            if(accountsArray[i]==account)
+                accountExists=true;
+        }
+        if(!accountExists) return RSS_ERROR_BAD_ACCOUNT;	
+    }
+
+    // get an array of followed usernames and transform it to required format
+    Array params1;
+    params1.push_back(account);
+    Array followingArray = getfollowing(params1,false).get_array();
+    Array postSources;
+    for(int i=0;i<followingArray.size();i++)
+    {
+        Object item;
+        item.push_back(Pair("username",followingArray[i]));
+        postSources.push_back(item);
+    }
+
+    Array params2;
+    params2.push_back(max);
+    params2.push_back(postSources);
+    Array posts = getposts(params2,false).get_array();
+    Array params3;
+    params3.push_back(account);
+    params3.push_back(max);
+    params3.push_back(postSources);
+    Object messages = getdirectmsgs(params3,false).get_obj();
+    vector<Object> outputVector;   
+          
+    for(int j=0;j<messages.size();j++)
+    {
+        Array userArray = messages[j].value_.get_array();
+        for(int i=0;i<userArray.size();i++)
+        {
+            try
+            {
+                if(find_value(userArray[i].get_obj(),"fromMe").get_bool())      //only report received messages
+                  continue;
+                
+                string postTitle, postAuthor, postMsg;
+                postAuthor=messages[j].name_;
+                postTitle="Direct Message from "+postAuthor;
+                postMsg=find_value(userArray[i].get_obj(),"text").get_str();            
+                time_t postTime(find_value(userArray[i].get_obj(),"time").get_int64());
+
+                Object item;
+                item.push_back(Pair("time",postTime));
+                item.push_back(Pair("title",postTitle));
+                item.push_back(Pair("author",postAuthor));
+                item.push_back(Pair("msg",postMsg));
+                outputVector.push_back(item);
+            }
+            catch(exception ex)
+            {
+                fprintf(stderr, "Warning: RSS couldn't parse a direct message, skipping.\n");
+                continue;
+            }
+        }
+    }
+        
+    for(int i=0;i<posts.size();i++)
+    {
+        try
+        {
+            Object userpost = find_value(posts[i].get_obj(),"userpost").get_obj();
+            string postTitle, postAuthor, postMsg;
+            Value rt = find_value(userpost,"rt");
+
+            if(rt.is_null())    // it's a normal post
+            {
+                postAuthor = find_value(userpost,"n").get_str();
+                Value reply = find_value(userpost,"reply");
+                if(!reply.is_null()&&find_value(reply.get_obj(),"n").get_str()==account)
+                {
+                    postTitle = "Reply from "+postAuthor;
+                }
+                else postTitle = postAuthor;
+                postMsg = find_value(userpost,"msg").get_str();
+            }
+            else   // it's a retwist
+            {               
+                postAuthor = find_value(rt.get_obj(),"n").get_str();
+                postTitle = postAuthor + " - via " + find_value(userpost,"n").get_str();
+                postMsg = find_value(rt.get_obj(),"msg").get_str();
+            }
+            
+            time_t postTime(find_value(userpost,"time").get_int64());
+            
+            Object item;
+            item.push_back(Pair("time",postTime));
+            item.push_back(Pair("title",postTitle));
+            item.push_back(Pair("author",postAuthor));
+            item.push_back(Pair("msg",postMsg));
+            outputVector.push_back(item);
+        }
+        catch(exception ex)
+        {
+            fprintf(stderr, "Warning: RSS couldn't parse a public post, skipping.\n");
+            continue;
+        }
+    }
+    
+    sort(outputVector.begin(),outputVector.end(),sortByTime);
+    
+    ostringstream ret;
+    
+    ret << "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n"
+        << "<rss version=\"2.0\">\n"
+        << "<channel>\n"
+        << "  <title>Twister Postboard - " << account << "</title>\n"
+        << "  <description>New posts from Twister</description>\n";
+    
+    int outputSize = (outputVector.size()>max)?max:outputVector.size();
+    
+    for(int i=0;i<outputSize;i++)
+    {
+        Object item = outputVector[i];
+        time_t postTime(find_value(item,"time").get_int64());
+        char timeString[100];
+        strftime(timeString, sizeof(timeString), "%a, %d %b %Y %H:%M:%S %z", gmtime(&postTime));
+
+        ret << "  <item>\n"
+            << "    <title>" << find_value(item,"title").get_str() << "</title>\n"
+            << "    <author>" << find_value(item,"author").get_str() << "</author>\n"
+            << "    <description>" << find_value(item,"msg").get_str() << "</description>\n"
+            << "    <pubDate>" << timeString << "</pubDate>\n"
+            << "  </item>\n";
+    }
+
+    ret << "</channel>\n"
+        << "</rss>\n";
+
+    *output = ret.str();
+    return RSS_OK;
+}
+
+bool sortByTime (Object i,Object j)
+{ 
+    return (find_value(i,"time").get_int64()>find_value(j,"time").get_int64());
+}
diff --git a/src/twister_rss.h b/src/twister_rss.h
new file mode 100644
index 00000000..e618497e
--- /dev/null
+++ b/src/twister_rss.h
@@ -0,0 +1,18 @@
+#ifndef TWISTER_RSS_H
+#define TWISTER_RSS_H
+
+#include "json/json_spirit.h"
+#include <string>
+
+enum RSSResultCode
+{
+    RSS_OK 		   =  0,
+    RSS_ERROR_NO_ACCOUNT   = -1,
+    RSS_ERROR_BAD_ACCOUNT  = -2,
+    RSS_ERROR_NOT_A_NUMBER = -3
+};
+
+extern bool sortByTime (json_spirit::Object i,json_spirit::Object j);
+extern int generateRSS(std::string uri, std::string *output);
+
+#endif // TWISTER_RSS_H
diff --git a/twister-qt.pro b/twister-qt.pro
index 0a9a1ebf..f86b9e9e 100644
--- a/twister-qt.pro
+++ b/twister-qt.pro
@@ -201,6 +201,7 @@ HEADERS +=  \
     src/scrypt.h \
     src/utf8core.h \
     src/twister.h \
+    src/twister_rss.h \
     src/twister_utils.h
 
 #    src/qt/bitcoingui.h
@@ -277,6 +278,7 @@ SOURCES += \ #src/qt/bitcoin.cpp \
     src/txdb.cpp \
     src/scrypt.cpp \
     src/twister.cpp \
+    src/twister_rss.cpp \
     src/twister_utils.cpp
 
 #    src/qt/guiutil.cpp \