switched postgresql schema from json type to plaintext

2 files changed, 13 insertions, 11 deletions

diff --git a/backend/node/src/clipperz.js b/backend/node/src/clipperz.js
index b98c00e..b8b4d3e 100644
--- a/backend/node/src/clipperz.js
+++ b/backend/node/src/clipperz.js
@@ -1,572 +1,574 @@
 var FS = require('fs');
 var CRYPTO = require('crypto');
 var BIGNUM = require('bignum');
 var ASYNC = require('async');
 
 var express_store = require('express').session.Store;
 
 function clipperz_hash(v) {
  return CRYPTO.createHash('sha256').update(
   CRYPTO.createHash('sha256').update(v).digest('binary')
  ).digest('hex');
 };
 function clipperz_random() {
  for(var r = '';r.length<64;r+=''+BIGNUM(Math.floor(Math.random()*1e18)).toString(16));
  return r.substr(0,64);
 };
 function clipperz_store(PG) {
  var rv = function(o) { express_store.call(this,o); }
  rv.prototype.get = function(sid,cb) { PG.Q(
   "SELECT s_data FROM clipperz.thesession WHERE s_id=$1",[sid],
-  function(e,r) { cb(e,(e||!r.rowCount)?null:r.rows[0].s_data); }
+  function(e,r) { cb(e,(e||!r.rowCount)?null:JSON.parse(r.rows[0].s_data)); }
  ) };
- rv.prototype.set = function(sid,data,cb) { PG.Q(
-   "UPDATE clipperz.thesession SET s_data=$1, s_mtime=current_timestamp"
-  +" WHERE s_id=$2",[data,sid], function(e,r) {
+ rv.prototype.set = function(sid,data,cb) {
+  var d = JSON.stringify(data);
+  PG.Q(
+    "UPDATE clipperz.thesession SET s_data=$1, s_mtime=current_timestamp"
+   +" WHERE s_id=$2",[d,sid], function(e,r) {
    if(e) return cb(e);
    if(r.rowCount) return cb();
-   PG.Q("INSERT INTO clipperz.thesession (s_id,s_data) VALUES ($1,$2)",[sid,data],cb);
-  }
- ) };
+   PG.Q("INSERT INTO clipperz.thesession (s_id,s_data) VALUES ($1,$2)",[sid,d],cb);
+  });
+ };
  rv.prototype.destroy = function(sid,cb) { PG.Q(
   "DELETE FROM clipperz.thesession WHERE s_id=$1",[sid],cb
  ) };
  rv.prototype.length = function(cb) { PG.Q(
   "SELECT count(*) AS c FROM clipperz.thesession", function(e,r) {
      cb(e,e?null:r.rows[0].c);
   }
  ) };
  rv.prototype.length = function(cb) { PQ.Q(
   "DELETE FROM clipperz.thesession", cb
  ) };
  rv.prototype.__proto__ = express_store.prototype;
  return rv;
 }
 
 var srp_g = BIGNUM(2);
 var srp_n = BIGNUM("115b8b692e0e045692cf280b436735c77a5a9e8a9e7ed56c965f87db5b2a2ece3",16);
 var n123 = '112233445566778899aabbccddeeff00112233445566778899aabbccddeeff00';
 
 
 var CLIPPERZ = module.exports = function(CONFIG) {
 
  var LOGGER = CONFIG.logger||{trace:function(){}};
 
  var PG = {
   url: CONFIG.psql,
   PG: require('pg').native,
   Q: function(q,a,cb) {
    if('function'===typeof a) cb=a,a=[];
    LOGGER.trace({query:q,args:a},'SQL: %s',q);
    PG.PG.connect(PG.url,function(e,C,D) {
         if(e) return cb(e);
         var t0=new Date();
         C.query(q,a,function(e,r) {
          var t1=new Date(), dt=t1-t0;
          D();
          LOGGER.trace({query:q,args:a,ms:dt,rows:r&&r.rowCount,err:e},"SQL query '%s' took %dms",q,dt);
          cb(e,r);
         });
    });
   },
   T: function(cb) {
    PG.PG.connect(PG.url,function(e,C,D) {
         if(e) return cb(e);
         C.query('BEGIN',function(e){
          if(e) return D(),cb(e);
          cb(null,{
           Q: function(q,a,cb) {
            LOGGER.trace({query:q,args:a},'SQL: %s',q);
            if(this.over) return cb(new Error('game over'));
            if('function'===typeof a) cb=a,a=[];
            var t0=new Date();
            C.query(q,a,function(e,r) {
                 var t1=new Date(), dt=t1-t0;
                 LOGGER.trace({query:q,args:a,ms:dt,rows:r&&r.rowCount,err:e},"SQL query '%s' took %dms",q,dt);
                 cb(e,r);
            });
           },
           commit: function(cb) {
            LOGGER.trace('SQL: commit');
            if(this.over) return cb(new Error('game over'));
            return (this.over=true),C.query('COMMIT',function(e){D();cb&&cb(e)});
           },
           rollback: function(cb) {
            LOGGER.trace('SQL: rollback');
            if(this.over) return cb(new Error('game over'));
            return (this.over=true),C.query('ROLLBACK',function(e){D();cb&&cb(e)});
           },
           end: function(e,cb) {
            if(e) return LOGGER.trace(e,"rolling back transaction due to an error"),this.rollback(cb);
            this.commit(cb);
           }
          });
         });
    });
   }
  };
 
 
  var rv = {
 
   json: function clipperz_json(req,res,cb) {
    var method = req.body.method, pp = JSON.parse(req.body.parameters).parameters;
    var message = pp.message;
    var ppp = pp.parameters;
    res.res = function(o) { return res.json({result:o}) };
    LOGGER.trace({method:method,parameters:pp},"JSON request");
 
    switch(method) {
     case 'registration':
      switch(message) {
       case 'completeRegistration': return PG.Q(
         "INSERT INTO clipperz.theuser"
        +" (u_name, u_srp_s,u_srp_v, u_authversion,u_header,u_statistics,u_version,u_lock)"
        +" VALUES ($1, $2,$3, $4,$5,$6,$7,$8)",
        [pp.credentials.C, pp.credentials.s, pp.credentials.v,
         pp.credentials.version,pp.user.header, pp.user.statistics,
         pp.user.version, pp.user.lock], function(e,r) {
         if(e) return cb(e);
         res.res({lock:pp.user.lock,result:'done'});
        });
      }
     break;
 
     case 'handshake':
      switch(message) {
       case 'connect': return ASYNC.auto({
        u: function(cb) { PG.Q(
         "SELECT u_id, u_srp_s, u_srp_v FROM clipperz.theuser WHERE u_name=$1",
         [ppp.C], function(e,r) {
         if(e) return cb(e);
         if(!r.rowCount) return cb(null,{u_id:null,u_srp_s:n123,u_srp_v:n123});
         cb(null,r.rows[0]);
        }) },
        otp: ['u',function(cb,r) {
         if(!req.session.otp) return cb();
         if(req.session.u!=r.u.u_id) return cb(new Error('user/OTP mismatch'));
         PG.Q(
           "UPDATE clipperz.theotp AS otp"
          +" SET"
          +"  otps_id=CASE WHEN s.otps_code='REQUESTED' THEN ("
          +"   SELECT ss.otps_id FROM clipperz.otpstatus AS ss WHERE ss.otps_code='USED'"
          +"  ) ELSE otp.otps_id END,"
          +"  otp_utime=current_timestamp"
          +" FROM clipperz.otpstatus AS s, clipperz.theotp AS o"
          +" WHERE"
          +"  o.otp_id=otp.otp_id AND otp.otps_id=s.otps_id"
          +"  AND otp.otp_id=$1 AND otp.u_id=$2"
          +" RETURNING o.otps_id!=otp.otps_id AS yes, o.otp_ref",
          [ req.session.otp, req.session.u ],
          function(e,r) {
          if(e) return cb(e);
          if(!r.rowCount) return cb(new Error('no OTP found'));
          r=r.rows[0];
          if(!r.yes) return cb(new Error('OTP is in a sorry state'));
          cb(null,{ref:r.otp_ref});
         });
        }]
       },function(e,r) {
        if(e) return cb(e);
        req.session.C = ppp.C; req.session.A = ppp.A;
        req.session.s = r.u.u_srp_s; req.session.v = r.u.u_srp_v;
        req.session.u = r.u.u_id;
        req.session.b = clipperz_random();
        req.session.B = BIGNUM(req.session.v,16).add(srp_g.powm(BIGNUM(req.session.b,16),srp_n)).toString(16);
        var rv = {s:req.session.s,B:req.session.B}
        if(r.otp && r.otp.otp_ref) rv.oneTimePassword=r.otp.otp_ref;
        res.res(rv);
       });
  
       case 'credentialCheck':
        var u = clipperz_hash(BIGNUM(req.session.B,16).toString(10));
        var A = BIGNUM(req.session.A,16);
        var S = A.mul(BIGNUM(req.session.v,16).powm(BIGNUM(u,16),srp_n)).powm(
                 BIGNUM(req.session.b,16), srp_n);
        var K = clipperz_hash(S.toString(10));
        var M1 = clipperz_hash(A.toString(10)+BIGNUM(req.session.B,16).toString(10)+K.toString(16));
        if(M1!=ppp.M1) return res.res({error:'?'});
        req.session.K = K;
        var M2 = clipperz_hash(A.toString(10)+M1+K.toString(16));
        return res.res({M2:M2,connectionId:'',loginInfo:{latest:{},current:{}},offlineCopyNeeded:false,lock:'----'});
 
       case 'oneTimePassword': return PG.Q(
         "UPDATE clipperz.theotp AS otp"
        +" SET"
        +"  otps_id = CASE WHEN s.otps_code!='ACTIVE' THEN s.otps_id ELSE ("
        +"   SELECT ss.otps_id FROM clipperz.otpstatus AS ss WHERE ss.otps_code=CASE"
        +"    WHEN otp.otp_key_checksum=$2 THEN 'REQUESTED'"
        +"    ELSE 'DISABLED' END"
        +"  ) END,"
        +"  otp_data = CASE WHEN s.otps_code='ACTIVE' THEN '' ELSE otp.otp_data END,"
        +"  otp_utime = current_timestamp,"
        +"  otp_rtime = CASE WHEN otp.otp_key_checksum=$2 THEN current_timestamp ELSE otp.otp_rtime END"
        +" FROM clipperz.otpstatus AS s, clipperz.theotp AS o"
        +" WHERE"
        +"  o.otp_id=otp.otp_id AND otp.otps_id=s.otps_id AND otp.otp_key=$1"
        +" RETURNING otp.u_id, s.otps_code, otp.otp_id, otp.otp_key_checksum, o.otp_data, otp.otp_version",
        [ ppp.oneTimePasswordKey, ppp.oneTimePasswordKeyChecksum ],
        function(e,r) {
        if(e) return cb(e);
        if(!r.rowCount) return cb(new Error('OTP not found'));
        r=r.rows[0];
        if(r.otp_key_checksum!=ppp.oneTimePasswordKeyChecksum)
         return cb(new Error('OTP was disabled because of checksum mismatch'));
        if(r.otps_code!='ACTIVE')
         return cb(new Error("OTP wasn't active, sorry"));
        req.session.u=r.u_id; req.session.otp=r.otp_id;
        res.res({data:r.otp_data,version:r.otp_version});
       });
      }
     break;
 
     case 'message':
      if(!req.session.K) return res.res({result:'EXCEPTION',message:"effectively, we're missing a aconnection"});
      if(req.session.K!=pp.srpSharedSecret) return res.res({error:'Wrong shared secret!'});
      switch(message) {
       case 'getUserDetails': return ASYNC.parallel({
        u: function(cb) {
-        PG.Q("SELECT u_header::varchar,u_statistics,u_version FROM clipperz.theuser WHERE u_id=$1",
+        PG.Q("SELECT u_header,u_statistics,u_version FROM clipperz.theuser WHERE u_id=$1",
          [req.session.u],function(e,r) {
          if(e) return cb(e);
          if(!r.rowCount) return cb(new Error("user's gone AWOL"));
          cb(null,r.rows[0]);
         });
        },
        stats: function(cb) {
         PG.Q("SELECT r_ref,r_mtime FROM clipperz.therecord WHERE u_id=$1",
          [req.session.u],function(e,r) {
          if(e) return cb(e);
          cb(null,r.rows.reduce(function(p,r){p[r.r_ref]={updateDate:r.r_mtime};return p},{}));
         });
        }
       },function(e,r) {
        if(e) return cb(e);
        res.res({header:r.u.u_header,statistics:r.u.u_statistics,version:r.u.u_version,recordsStats:r.stats});
       });
 
       case 'saveChanges': return PG.T(function(e,T) {
        if(e) return cb(e);
        ASYNC.auto({
         user: function(cb) {
          T.Q(
            "UPDATE clipperz.theuser"
           +" SET u_header=$1, u_statistics=$2, u_version=$3, u_lock=COALESCE($4,u_lock)"
           +" WHERE u_id=$5"
           +" RETURNING u_lock",[ppp.user.header,ppp.user.statistics,ppp.user.version,ppp.user.lock||null,req.session.u],
           function(e,r) {
           if(e) return cb(e);
           if(!r.rowCount) return cb(new Error("user's gone AWOL"));
           cb(null,r.rows[0]);
          });
         },
         updaterecords: function(cb) {
          if(!(ppp.records && ppp.records.updated && ppp.records.updated.length)) return cb();
          ASYNC.each(ppp.records.updated,function(r,cb) {
           ASYNC.auto({
            updater: function(cb) {
             T.Q(
               "UPDATE clipperz.therecord"
              +" SET r_data=$2, r_version=$3, r_mtime=current_timestamp"
              +" WHERE r_ref=$1 AND u_id=$4 RETURNING r_id",
              [r.record.reference,r.record.data,r.record.version,req.session.u], function(e,r) {
              if(e) return cb(e);
              return cb(null,r.rows.length?r.rows[0]:null);
             });
            },
            insertr: ['updater',function(cb,rr) {
             if(rr.updater) return cb();
             T.Q(
               "INSERT INTO clipperz.therecord"
              +" (u_id,r_ref,r_data,r_version)"
              +" VALUES ($1,$2,$3,$4) RETURNING r_id",[req.session.u,r.record.reference,r.record.data,r.record.version],
              function(e,r) {
              if(e) return cb(e);
              return cb(null,r.rows[0]);
             });
            }],
            updatev: ['updater','insertr',function(cb,rr) {
             var crv=r.currentRecordVersion;
             T.Q(
               "UPDATE clipperz.therecordversion"
              +" SET rv_ref=$1, rv_data=$2, rv_version=$3,"
              +"  rv_previous_id=COALESCE($4,rv_previous_id),"
              +"  rv_previous_key=$5, r_id=$6, rv_mtime=current_timestamp"
              +" WHERE"
              +"  rv_id=(SELECT rv_id FROM clipperz.therecordversion WHERE r_id=$6 ORDER BY r_id ASC LIMIT 1)"
              +" RETURNING rv_id",
              [crv.reference,crv.data,crv.version,
               crv.previousVersion||null,crv.previousVersionKey,
               (rr.updater||rr.insertr).r_id],
              function(e,r) {
              if(e) return cb(e);
              return cb(null,r.rows.length?r.rows[0]:null);
             });
            }],
            insertv: ['updatev',function(cb,rr) {
             if(rr.updatev) return cb();
             var crv=r.currentRecordVersion;
             T.Q(
               "INSERT INTO clipperz.therecordversion"
              +" (r_id,rv_ref,rv_data,rv_version,rv_previous_id,rv_previous_key)"
              +" VALUES ($1,$2,$3,$4,$5,$6) RETURNING rv_id",
              [(rr.updater||rr.insertr).r_id,
               crv.reference, crv.data, crv.version,
               crv.previousVersion||null,crv.previousVersionKey],
              function(e,r) {
              if(e) return cb(e);
              return cb(null,r.rows[0]);
             });
            }]
           },cb);
          },cb);
         },
         deleterecords: function(cb) {
          if(!(ppp.records && ppp.records.deleted && ppp.records.deleted.length)) return cb();
          T.Q(
            "DELETE FROM clipperz.therecord"
           +" WHERE r_ref = ANY($1::text[]) AND u_id=$2",
           [ '{'+ppp.records.deleted.join(',')+'}', req.session.u ], cb);
         }
        },function(e,r) {
         T.end(e, function(e) {
          if(e) return cb(e);
          res.res({result:'done',lock:r.user.u_lock});
         });
        });
       });
 
       case 'getRecordDetail': return ASYNC.auto({ // TODO: could be done in one query instead
        record: function(cb) {
         PG.Q(
          "SELECT r_id,r_ref,r_data,r_version, r_ctime, r_mtime, r_atime FROM clipperz.therecord WHERE r_ref=$1",
          [ppp.reference],function(e,r) {
           if(e) return cb(e);
           if(!r.rowCount) return cb(new Error('no record found'));
           return cb(null,r.rows[0]);
         });
        },
        version: ['record',function(cb,r) {
         PG.Q(
           "SELECT rv_ref, rv_data, rv_header, rv_version, rv_ctime, rv_mtime, rv_atime"
          +" FROM clipperz.therecordversion WHERE r_id=$1 ORDER BY rv_id ASC LIMIT 1",
          [r.record.r_id],function(e,r) {
          if(e) return cb(e);
          if(!r.rowCount) return cb(new Error('no record version found'));
          return cb(null,r.rows[0]);
         });
        }]
       },function(e,r) {
        if(e) return cb(e);
        var v = {};
        v[r.version.rv_ref] = {
         reference: r.version.rv_ref,
         data: r.version.rv_data, header: r.version.rv_header,
         version: r.version.rv_version,
         creationDate: r.version.rv_ctime, updateDate: r.version.rv_mtime, accessDate: r.version.rv_atime
        };
        res.res({ versions: v, currentVersion: r.version.rv_ref, reference: r.record.r_ref,
         data: r.record.r_data, version: r.record.r_version,
         creationDate: r.record.r_ctime, updateDate: r.record.r_mtime, accessDate: r.record.r_atime,
         oldestUsedEncryptedVersion: '---' });
       });
 
       case 'addNewOneTimePassword': return PG.T(function(e,T) {
        if(e) return cb(e);
        ASYNC.parallel({
         otp: function(cb) {
          var otp = ppp.oneTimePassword;
          T.Q(
            "INSERT INTO clipperz.theotp"
           +" (u_id,otp_ref,otp_key,otp_key_checksum,otp_data,otp_version,otps_id)"
           +" SELECT $1,$2,$3,$4,$5,$6,otps_id FROM clipperz.otpstatus"
           +" WHERE otps_code='ACTIVE'",
           [ req.session.u, otp.reference, otp.key, otp.keyChecksum,
             otp.data, otp.version], function(e,r) {
           if(e) return cb(e);
           if(!r.rowCount) return cb(new Error('no user or status'));
           cb();
          });
         },
         user: function(cb) {
          var u = ppp.user;
          T.Q(
            "UPDATE clipperz.theuser"
           +" SET u_header=$1, u_statistics=$2, u_version=$3, u_lock=COALESCE($4,u_lock)"
           +" WHERE u_id=$5",
           [ u.header, u.statistics, u.version, u.lock||null, req.session.u],
           function(e,r) {
           if(e) return cb(e);
           if(!r.rowCount) return cb(new Error("user's gone AWOL"));
           cb();
          });
         }
        },function(e,r) {
         T.end(e, function(e) {
          if(e) return cb(e);
          res.res({result:'done',lock:ppp.user.lock});
         });
        });
       });
 
       case 'updateOneTimePasswords': return PG.T(function(e,T) {
        if(e) return cb(e);
        ASYNC.parallel({
         otp: function(cb) {
          T.Q(
            "DELETE FROM clipperz.theotp"
           +" WHERE u_id=$1"
           +"  AND NOT otp_ref = ANY($2::text[])",
           [ req.session.u,'{'+ppp.oneTimePasswords.join(',')+'}' ],cb);
         },
         user: function(cb) {
          var u = ppp.user;
          T.Q(
            "UPDATE clipperz.theuser"
           +" SET u_header=$1, u_statistics=$2, u_version=$3, u_lock=COALESCE($4,u_lock)"
           +" WHERE u_id=$5",
           [ u.header, u.statistics, u.version, u.lock||null, req.session.u],
           function(e,r) {
           if(e) return cb(e);
           if(!r.rowCount) return cb(new Error("user's gone AWOL"));
           cb();
          });
         }
        },function(e,r) {
         T.end(e, function(e) {
          if(e) return cb(e);
          res.res({result:ppp.user.lock});
         });
        });
       });
 
       case 'upgradeUserCredentials': return PG.T(function(e,T) {
        if(e) return cb(e);
        ASYNC.parallel({
         user: function(cb) {
          var u = ppp.user, c = ppp.credentials;
          T.Q(
            "UPDATE clipperz.theuser"
           +" SET u_header=$1, u_statistics=$2, u_version=$3, u_lock=COALESCE($4,u_lock),"
           +"  u_name=$5, u_srp_s=$6, u_srp_v=$7, u_authversion=$8"
           +" WHERE u_id=$9 RETURNING u_lock",
           [ u.header,u.statistics,u.version,u.lock||null,
             c.C,c.s,c.v,c.version, req.session.u ],function(e,r) {
           if(e) return cb(e);
           if(!r.rowCount) return cb(new Error("user's gone AWOL"));
           cb(e,r.rows[0]);
          });
         },
         otp: function(cb) {
          var otps=ppp.oneTimePasswords;
          if(!otps) return cb();
          ASYNC.each(Object.keys(otps),function(r,cb) {
           T.Q(
             "UPDATE clipperz.theotp"
            +" SET otp_data=$1, otp_utime=current_timestamp WHERE otp_ref=$2 AND u_id=$3",
            [ otps[r], r, req.session.u ], function(e,r) {
            if(e) return cb(e);
            if(!r.rowCount) return cb(new Error("OTP's gone AWOL"));
            cb();
           });
          },cb);
         }
        },function(e,r) {
         T.end(e, function(e) {
          if(e) return cb(e);
          res.res({result:'done',lock:r.user.u_lock});
         });
        });
       });
 
       case 'deleteUser': return PG.Q(
        "DELETE FROM clipperz.theuser WHERE u_id=$1",
        [req.session.u],function(e,r) {
        if(e) return cb(e);
        res.res({result:'ok'});
       });
 
       case 'echo': return res.res({result:ppp});
       case 'getOneTimePasswordsDetails': return res.res({});
       case 'getLoginHistory': return res.res({result:[]});
      }
     break;
     case 'logout': return req.session.destroy(function(e){res.res({})});
    }
    cb();
   },
 
   dump: function(req,res,cb) {
    if(!req.session.u) return cb(new Error('logging in helps'));
    return ASYNC.parallel({
     u: function(cb) {
      PG.Q(
        "SELECT"
-      +" u_name, u_srp_s, u_srp_v, u_authversion, u_header::varchar, u_statistics, u_version"
+      +" u_name, u_srp_s, u_srp_v, u_authversion, u_header, u_statistics, u_version"
       +" FROM clipperz.theuser WHERE u_id=$1",[req.session.u],function(e,r) {
       if(e) return cb(e);
       if(!r.rowCount) return cb(new Error("user's gone AWOL"));
       r = r.rows[0];
       return cb(null,{u:r.u_name,d:{s:r.u_srp_s,v:r.u_srp_v, version:r.u_authversion,
        maxNumberOfRecords: '100', userDetails: r.u_header,
        statistics: r.u_statistics, userDetailsVersion: r.u_version
       }});
      });
     },
     records: function(cb) {
      PG.Q(
        "SELECT"
       +"  r.r_id, r.r_ref, r_data, r_version, r_ctime, r_mtime, r_atime,"
       +"  rv.rv_id, rv.rv_ref AS rv_ref, rv_header, rv_data, rv_version, rv_ctime, rv_mtime, rv_atime"
       +" FROM"
       +"  clipperz.therecord AS r"
       +"  LEFT JOIN clipperz.therecordversion AS rv USING (r_id)"
       +" WHERE r.u_id=$1"
       +" ORDER BY r.r_id ASC, rv.rv_id ASC", [req.session.u],function(e,r) {
       if(e) return cb(e);
       var rv = {};
       r.rows.forEach(function(r) {
        if(!rv[r.r_ref]) rv[r.r_ref] = {
         data: r.r_data, version: r.r_version,
         creationDate: r.r_ctime.toString(),
         updateDate: r.r_mtime.toString(),
         accessDate: r.r_atime.toString(),
         versions: {}
        };
        if(!r.rv_id) return;
        rv[r.r_ref].versions[rv[r.r_ref].currentVersion=r.rv_ref] = {
         header: r.rv_header, data: r.rv_data, version: r.rv_version,
         creationDate: r.rv_ctime.toString(),
         updateDate: r.rv_mtime.toString(),
         accessDate: r.rv_atime.toString()
        };
       });
       cb(null,rv);
      });
     },
     html: function(cb) {
      FS.readFile(CONFIG.dump_template,{encoding:'utf-8'},cb);
     }
    },function(e,r) {
     if(e) return cb(e);
     var d = new Date();
     res.attachment('Clipperz_'+d.getFullYear()+'_'+(d.getMonth()+1)+'_'+d.getDate()+'.html');
     var ojs = { users: {
      catchAllUser: { __masterkey_test_value__: 'masterkey', s: n123, v: n123 }
     } };
     r.u.d.records = r.records;
     ojs.users[r.u.u] = r.u.d;
     res.send(r.html.replace('/*offline_data_placeholder*/',
       "_clipperz_dump_data_="+JSON.stringify(ojs)
      +";"
      +"Clipperz.PM.Proxy.defaultProxy = new Clipperz.PM.Proxy.Offline();"
      +"Clipperz.Crypto.PRNG.defaultRandomGenerator().fastEntropyAccumulationForTestingPurpose();"));
    });
   }
 
  };
  rv.__defineGetter__('session_store',function(){ return function(o) { return new (clipperz_store(PG))(o) } });
 
  return rv;
 
 };
diff --git a/backend/node/src/clipperz.schema.sql b/backend/node/src/clipperz.schema.sql
index 1c2305c..591828a 100644
--- a/backend/node/src/clipperz.schema.sql
+++ b/backend/node/src/clipperz.schema.sql
@@ -1,67 +1,67 @@
 CREATE SCHEMA clipperz;
 
 CREATE TABLE clipperz.theuser (
  u_id serial PRIMARY KEY,
  u_name varchar NOT NULL UNIQUE,
  u_srp_s varchar NOT NULL,
  u_srp_v varchar NOT NULL,
- u_header json NOT NULL,
+ u_header varchar NOT NULL,
  u_statistics varchar NOT NULL,
  u_authversion varchar NOT NULL,
  u_version varchar NOT NULL,
  u_lock varchar NOT NULL
 );
 
 CREATE TABLE clipperz.therecord (
  r_id serial PRIMARY KEY,
  u_id integer NOT NULL REFERENCES clipperz.theuser(u_id) ON UPDATE CASCADE ON DELETE CASCADE,
  r_ref varchar NOT NULL UNIQUE,
  r_data varchar NOT NULL,
  r_version varchar NOT NULL,
  r_ctime timestamp NOT NULL DEFAULT current_timestamp,
  r_mtime timestamp NOT NULL DEFAULT current_timestamp,
  r_atime timestamp NOT NULL DEFAULT current_timestamp
 );
 CREATE INDEX therecord_u_id_key ON clipperz.therecord (u_id);
 
 CREATE TABLE clipperz.therecordversion (
  rv_id serial PRIMARY KEY,
  r_id integer NOT NULL REFERENCES clipperz.therecord (r_id) ON UPDATE CASCADE ON DELETE CASCADE,
  rv_ref varchar NOT NULL UNIQUE,
  rv_header varchar,
  rv_data varchar NOT NULL,
  rv_version varchar NOT NULL,
  rv_previous_key varchar NOT NULL,
  rv_previous_id varchar,
  rv_ctime timestamp NOT NULL DEFAULT current_timestamp,
  rv_mtime timestamp NOT NULL DEFAULT current_timestamp,
  rv_atime timestamp NOT NULL DEFAULT current_timestamp
 );
 
 CREATE TABLE clipperz.otpstatus (
  otps_id serial PRIMARY KEY,
  otps_code varchar NOT NULL,
  otps_name varchar NOT NULL,
  otps_desc varchar NOT NULL
 );
 
 CREATE TABLE clipperz.theotp (
  otp_id serial PRIMARY KEY,
  u_id integer REFERENCES clipperz.theuser (u_id) ON UPDATE CASCADE ON DELETE CASCADE,
  otps_id integer REFERENCES clipperz.otpstatus (otps_id) ON UPDATE CASCADE ON DELETE CASCADE,
  otp_ref varchar NOT NULL UNIQUE,
  otp_key varchar NOT NULL UNIQUE,
  otp_key_checksum varchar NOT NULL,
  otp_data varchar NOT NULL,
  otp_version varchar NOT NULL,
  otp_ctime timestamp NOT NULL DEFAULT current_timestamp,
  otp_rtime timestamp NOT NULL DEFAULT current_timestamp,
  otp_utime timestamp NOT NULL DEFAULT current_timestamp
 );
 
 CREATE TABLE clipperz.thesession (
  s_id varchar PRIMARY KEY,
- s_data json,
+ s_data varchar,
  s_ctime timestamp DEFAULT current_timestamp,
  s_mtime timestamp DEFAULT current_timestamp
 );