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validation.js
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validation.js
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/*jslint node: true */
"use strict";
var _ = require('lodash');
var async = require('async');
var storage = require('./storage.js');
var graph = require('./graph.js');
var main_chain = require('./main_chain.js');
var paid_witnessing = require("./paid_witnessing.js");
var headers_commission = require("./headers_commission.js");
var mc_outputs = require("./mc_outputs.js");
var objectHash = require("./object_hash.js");
var objectLength = require("./object_length.js");
var db = require('./db.js');
var chash = require('./chash.js');
var mutex = require('./mutex.js');
var constants = require("./constants.js");
var ValidationUtils = require("./validation_utils.js");
var Definition = require("./definition.js");
var conf = require('./conf.js');
var profiler = require('./profiler.js');
var breadcrumbs = require('./breadcrumbs.js');
var MAX_INT32 = Math.pow(2, 31) - 1;
var hasFieldsExcept = ValidationUtils.hasFieldsExcept;
var isNonemptyString = ValidationUtils.isNonemptyString;
var isStringOfLength = ValidationUtils.isStringOfLength;
var isInteger = ValidationUtils.isInteger;
var isNonnegativeInteger = ValidationUtils.isNonnegativeInteger;
var isPositiveInteger = ValidationUtils.isPositiveInteger;
var isNonemptyArray = ValidationUtils.isNonemptyArray;
var isValidAddress = ValidationUtils.isValidAddress;
var isValidBase64 = ValidationUtils.isValidBase64;
function hasValidHashes(objJoint){
var objUnit = objJoint.unit;
if (objectHash.getUnitHash(objUnit) !== objUnit.unit)
return false;
return true;
}
function validate(objJoint, callbacks) {
var objUnit = objJoint.unit;
if (typeof objUnit !== "object" || objUnit === null)
throw Error("no unit object");
if (!objUnit.unit)
throw Error("no unit");
console.log("\nvalidating joint identified by unit "+objJoint.unit.unit);
if (!isStringOfLength(objUnit.unit, constants.HASH_LENGTH))
return callbacks.ifJointError("wrong unit length");
try{
// UnitError is linked to objUnit.unit, so we need to ensure objUnit.unit is true before we throw any UnitErrors
if (objectHash.getUnitHash(objUnit) !== objUnit.unit)
return callbacks.ifJointError("wrong unit hash: "+objectHash.getUnitHash(objUnit)+" != "+objUnit.unit);
}
catch(e){
return callbacks.ifJointError("failed to calc unit hash: "+e);
}
if (objJoint.unsigned){
if (hasFieldsExcept(objJoint, ["unit", "unsigned"]))
return callbacks.ifJointError("unknown fields in unsigned unit-joint");
}
else if ("ball" in objJoint){
if (!isStringOfLength(objJoint.ball, constants.HASH_LENGTH))
return callbacks.ifJointError("wrong ball length");
if (hasFieldsExcept(objJoint, ["unit", "ball", "skiplist_units"]))
return callbacks.ifJointError("unknown fields in ball-joint");
if ("skiplist_units" in objJoint){
if (!isNonemptyArray(objJoint.skiplist_units))
return callbacks.ifJointError("missing or empty skiplist array");
//if (objUnit.unit.charAt(0) !== "0")
// return callbacks.ifJointError("found skiplist while unit doesn't start with 0");
}
}
else{
if (hasFieldsExcept(objJoint, ["unit"]))
return callbacks.ifJointError("unknown fields in unit-joint");
}
if ("content_hash" in objUnit){ // nonserial and stripped off content
if (!isStringOfLength(objUnit.content_hash, constants.HASH_LENGTH))
return callbacks.ifUnitError("wrong content_hash length");
if (hasFieldsExcept(objUnit, ["unit", "version", "alt", "timestamp", "authors", "witness_list_unit", "witnesses", "content_hash", "parent_units", "last_ball", "last_ball_unit"]))
return callbacks.ifUnitError("unknown fields in nonserial unit");
if (!objJoint.ball)
return callbacks.ifJointError("content_hash allowed only in finished ball");
}
else{ // serial
if (hasFieldsExcept(objUnit, ["unit", "version", "alt", "timestamp", "authors", "messages", "witness_list_unit", "witnesses", "earned_headers_commission_recipients", "last_ball", "last_ball_unit", "parent_units", "headers_commission", "payload_commission"]))
return callbacks.ifUnitError("unknown fields in unit");
if (typeof objUnit.headers_commission !== "number")
return callbacks.ifJointError("no headers_commission");
if (typeof objUnit.payload_commission !== "number")
return callbacks.ifJointError("no payload_commission");
if (!isNonemptyArray(objUnit.messages))
return callbacks.ifUnitError("missing or empty messages array");
if (objUnit.messages.length > constants.MAX_MESSAGES_PER_UNIT)
return callbacks.ifUnitError("too many messages");
if (objectLength.getHeadersSize(objUnit) !== objUnit.headers_commission)
return callbacks.ifJointError("wrong headers commission, expected "+objectLength.getHeadersSize(objUnit));
if (objectLength.getTotalPayloadSize(objUnit) !== objUnit.payload_commission)
return callbacks.ifJointError("wrong payload commission, unit "+objUnit.unit+", calculated "+objectLength.getTotalPayloadSize(objUnit)+", expected "+objUnit.payload_commission);
}
if (!isNonemptyArray(objUnit.authors))
return callbacks.ifUnitError("missing or empty authors array");
if (objUnit.version !== constants.version)
return callbacks.ifUnitError("wrong version");
if (objUnit.alt !== constants.alt)
return callbacks.ifUnitError("wrong alt");
if (!storage.isGenesisUnit(objUnit.unit)){
if (!isNonemptyArray(objUnit.parent_units))
return callbacks.ifUnitError("missing or empty parent units array");
if (!isStringOfLength(objUnit.last_ball, constants.HASH_LENGTH))
return callbacks.ifUnitError("wrong length of last ball");
if (!isStringOfLength(objUnit.last_ball_unit, constants.HASH_LENGTH))
return callbacks.ifUnitError("wrong length of last ball unit");
}
if ("witness_list_unit" in objUnit && "witnesses" in objUnit)
return callbacks.ifUnitError("ambiguous witnesses");
var arrAuthorAddresses = objUnit.authors ? objUnit.authors.map(function(author) { return author.address; } ) : [];
var objValidationState = {
arrAdditionalQueries: [],
arrDoubleSpendInputs: [],
arrInputKeys: []
};
if (objJoint.unsigned)
objValidationState.bUnsigned = true;
if (conf.bLight){
if (!isPositiveInteger(objUnit.timestamp) && !objJoint.unsigned)
return callbacks.ifJointError("bad timestamp");
if (objJoint.ball)
return callbacks.ifJointError("I'm light, can't accept stable unit "+objUnit.unit+" without proof");
return objJoint.unsigned
? callbacks.ifOkUnsigned(true)
: callbacks.ifOk({sequence: 'good', arrDoubleSpendInputs: [], arrAdditionalQueries: []}, function(){});
}
else{
if ("timestamp" in objUnit && !isPositiveInteger(objUnit.timestamp))
return callbacks.ifJointError("bad timestamp");
}
mutex.lock(arrAuthorAddresses, function(unlock){
var conn = null;
var start_time = null;
async.series(
[
function(cb){
db.takeConnectionFromPool(function(new_conn){
conn = new_conn;
start_time = Date.now();
conn.query("BEGIN", function(){cb();});
});
},
function(cb){
profiler.start();
checkDuplicate(conn, objUnit.unit, cb);
},
function(cb){
profiler.stop('validation-checkDuplicate');
profiler.start();
objUnit.content_hash ? cb() : validateHeadersCommissionRecipients(objUnit, cb);
},
function(cb){
profiler.stop('validation-hc-recipients');
profiler.start();
!objUnit.parent_units
? cb()
: validateHashTree(conn, objJoint, objValidationState, cb);
},
function(cb){
profiler.stop('validation-hash-tree');
profiler.start();
!objUnit.parent_units
? cb()
: validateParents(conn, objJoint, objValidationState, cb);
},
function(cb){
profiler.stop('validation-parents');
profiler.start();
!objJoint.skiplist_units
? cb()
: validateSkiplist(conn, objJoint.skiplist_units, cb);
},
function(cb){
profiler.stop('validation-skiplist');
validateWitnesses(conn, objUnit, objValidationState, cb);
},
function(cb){
profiler.start();
validateAuthors(conn, objUnit.authors, objUnit, objValidationState, cb);
},
function(cb){
profiler.stop('validation-authors');
profiler.start();
objUnit.content_hash ? cb() : validateMessages(conn, objUnit.messages, objUnit, objValidationState, cb);
}
],
function(err){
profiler.stop('validation-messages');
if(err){
// We might have advanced the stability point and have to commit the changes as the caches are already updated.
// There are no other updates/inserts/deletes during validation
conn.query("COMMIT", function(){
var consumed_time = Date.now()-start_time;
profiler.add_result('failed validation', consumed_time);
console.log(objUnit.unit+" validation "+JSON.stringify(err)+" took "+consumed_time+"ms");
conn.release();
unlock();
if (typeof err === "object"){
if (err.error_code === "unresolved_dependency")
callbacks.ifNeedParentUnits(err.arrMissingUnits);
else if (err.error_code === "need_hash_tree") // need to download hash tree to catch up
callbacks.ifNeedHashTree();
else if (err.error_code === "invalid_joint") // ball found in hash tree but with another unit
callbacks.ifJointError(err.message);
else if (err.error_code === "transient")
callbacks.ifTransientError(err.message);
else
throw Error("unknown error code");
}
else
callbacks.ifUnitError(err);
});
}
else{
profiler.start();
conn.query("COMMIT", function(){
var consumed_time = Date.now()-start_time;
profiler.add_result('validation', consumed_time);
console.log(objUnit.unit+" validation ok took "+consumed_time+"ms");
conn.release();
profiler.stop('validation-commit');
if (objJoint.unsigned){
unlock();
callbacks.ifOkUnsigned(objValidationState.sequence === 'good');
}
else
callbacks.ifOk(objValidationState, unlock);
});
}
}
); // async.series
});
}
// ----------------
function checkDuplicate(conn, unit, cb){
conn.query("SELECT 1 FROM units WHERE unit=?", [unit], function(rows){
if (rows.length === 0)
return cb();
cb("unit "+unit+" already exists");
});
}
function validateHashTree(conn, objJoint, objValidationState, callback){
if (!objJoint.ball)
return callback();
var objUnit = objJoint.unit;
conn.query("SELECT unit FROM hash_tree_balls WHERE ball=?", [objJoint.ball], function(rows){
if (rows.length === 0)
return callback({error_code: "need_hash_tree", message: "ball "+objJoint.ball+" is not known in hash tree"});
if (rows[0].unit !== objUnit.unit)
return callback(createJointError("ball "+objJoint.ball+" unit "+objUnit.unit+" contradicts hash tree"));
conn.query(
"SELECT ball FROM hash_tree_balls WHERE unit IN(?) \n\
UNION \n\
SELECT ball FROM balls WHERE unit IN(?) \n\
ORDER BY ball",
[objUnit.parent_units, objUnit.parent_units],
function(prows){
if (prows.length !== objUnit.parent_units.length)
return callback(createJointError("some parents not found in balls nor in hash tree")); // while the child is found in hash tree
var arrParentBalls = prows.map(function(prow){ return prow.ball; });
if (!objJoint.skiplist_units)
return validateBallHash();
conn.query(
"SELECT ball FROM hash_tree_balls WHERE unit IN(?) \n\
UNION \n\
SELECT ball FROM balls WHERE unit IN(?) \n\
ORDER BY ball",
[objJoint.skiplist_units, objJoint.skiplist_units],
function(srows){
if (srows.length !== objJoint.skiplist_units.length)
return callback(createJointError("some skiplist balls not found"));
objValidationState.arrSkiplistBalls = srows.map(function(srow){ return srow.ball; });
validateBallHash();
}
);
function validateBallHash(){
var hash = objectHash.getBallHash(objUnit.unit, arrParentBalls, objValidationState.arrSkiplistBalls, !!objUnit.content_hash);
if (hash !== objJoint.ball)
return callback(createJointError("ball hash is wrong"));
callback();
}
}
);
});
}
// we cannot verify that skiplist units lie on MC if they are unstable yet,
// but if they don't, we'll get unmatching ball hash when the current unit reaches stability
function validateSkiplist(conn, arrSkiplistUnits, callback){
var prev = "";
async.eachSeries(
arrSkiplistUnits,
function(skiplist_unit, cb){
//if (skiplist_unit.charAt(0) !== "0")
// return cb("skiplist unit doesn't start with 0");
if (skiplist_unit <= prev)
return cb(createJointError("skiplist units not ordered"));
conn.query("SELECT unit, is_stable, is_on_main_chain, main_chain_index FROM units WHERE unit=?", [skiplist_unit], function(rows){
if (rows.length === 0)
return cb("skiplist unit "+skiplist_unit+" not found");
var objSkiplistUnitProps = rows[0];
// if not stable, can't check that it is on MC as MC is not stable in its area yet
if (objSkiplistUnitProps.is_stable === 1){
if (objSkiplistUnitProps.is_on_main_chain !== 1)
return cb("skiplist unit "+skiplist_unit+" is not on MC");
if (objSkiplistUnitProps.main_chain_index % 10 !== 0)
return cb("skiplist unit "+skiplist_unit+" MCI is not divisible by 10");
}
// we can't verify the choice of skiplist unit.
// If we try to find a skiplist unit now, we might find something matching on unstable part of MC.
// Again, we have another check when we reach stability
cb();
});
},
callback
);
}
function validateParents(conn, objJoint, objValidationState, callback){
// avoid merging the obvious nonserials
function checkNoSameAddressInDifferentParents(){
if (objUnit.parent_units.length === 1)
return callback();
conn.query("SELECT address, COUNT(*) AS c FROM unit_authors WHERE unit IN(?) GROUP BY address HAVING c>1", [objUnit.parent_units], function(rows){
if (rows.length > 0)
return callback("some addresses found more than once in parents, e.g. "+rows[0].address);
return callback();
});
}
function readMaxParentLastBallMci(handleResult){
conn.query(
"SELECT MAX(lb_units.main_chain_index) AS max_parent_last_ball_mci \n\
FROM units JOIN units AS lb_units ON units.last_ball_unit=lb_units.unit \n\
WHERE units.unit IN(?)",
[objUnit.parent_units],
function(rows){
var max_parent_last_ball_mci = rows[0].max_parent_last_ball_mci;
if (max_parent_last_ball_mci > objValidationState.last_ball_mci)
return callback("last ball mci must not retreat, parents: "+objUnit.parent_units.join(', '));
handleResult(max_parent_last_ball_mci);
}
);
}
var objUnit = objJoint.unit;
if (objUnit.parent_units.length > constants.MAX_PARENTS_PER_UNIT) // anti-spam
return callback("too many parents: "+objUnit.parent_units.length);
// obsolete: when handling a ball, we can't trust parent list before we verify ball hash
// obsolete: when handling a fresh unit, we can begin trusting parent list earlier, after we verify parents_hash
var createError = objJoint.ball ? createJointError : function(err){ return err; };
// after this point, we can trust parent list as it either agrees with parents_hash or agrees with hash tree
// hence, there are no more joint errors, except unordered parents or skiplist units
var last_ball = objUnit.last_ball;
var last_ball_unit = objUnit.last_ball_unit;
var prev = "";
var arrMissingParentUnits = [];
var arrPrevParentUnitProps = [];
objValidationState.max_parent_limci = 0;
var join = objJoint.ball ? 'LEFT JOIN balls USING(unit) LEFT JOIN hash_tree_balls ON units.unit=hash_tree_balls.unit' : '';
var field = objJoint.ball ? ', IFNULL(balls.ball, hash_tree_balls.ball) AS ball' : '';
async.eachSeries(
objUnit.parent_units,
function(parent_unit, cb){
if (parent_unit <= prev)
return cb(createError("parent units not ordered"));
prev = parent_unit;
conn.query("SELECT units.*"+field+" FROM units "+join+" WHERE units.unit=?", [parent_unit], function(rows){
if (rows.length === 0){
arrMissingParentUnits.push(parent_unit);
return cb();
}
var objParentUnitProps = rows[0];
// already checked in validateHashTree that the parent ball is known, that's why we throw
if (objJoint.ball && objParentUnitProps.ball === null)
throw Error("no ball corresponding to parent unit "+parent_unit);
if (objParentUnitProps.latest_included_mc_index > objValidationState.max_parent_limci)
objValidationState.max_parent_limci = objParentUnitProps.latest_included_mc_index;
async.eachSeries(
arrPrevParentUnitProps,
function(objPrevParentUnitProps, cb2){
graph.compareUnitsByProps(conn, objPrevParentUnitProps, objParentUnitProps, function(result){
(result === null) ? cb2() : cb2("parent unit "+parent_unit+" is related to one of the other parent units");
});
},
function(err){
if (err)
return cb(err);
arrPrevParentUnitProps.push(objParentUnitProps);
cb();
}
);
});
},
function(err){
if (err)
return callback(err);
if (arrMissingParentUnits.length > 0){
conn.query("SELECT error FROM known_bad_joints WHERE unit IN(?)", [arrMissingParentUnits], function(rows){
(rows.length > 0)
? callback("some of the unit's parents are known bad: "+rows[0].error)
: callback({error_code: "unresolved_dependency", arrMissingUnits: arrMissingParentUnits});
});
return;
}
// this is redundant check, already checked in validateHashTree()
if (objJoint.ball){
var arrParentBalls = arrPrevParentUnitProps.map(function(objParentUnitProps){ return objParentUnitProps.ball; }).sort();
//if (arrParentBalls.indexOf(null) === -1){
var hash = objectHash.getBallHash(objUnit.unit, arrParentBalls, objValidationState.arrSkiplistBalls, !!objUnit.content_hash);
if (hash !== objJoint.ball)
throw Error("ball hash is wrong"); // shouldn't happen, already validated in validateHashTree()
//}
}
conn.query(
"SELECT is_stable, is_on_main_chain, main_chain_index, ball, (SELECT MAX(main_chain_index) FROM units) AS max_known_mci \n\
FROM units LEFT JOIN balls USING(unit) WHERE unit=?",
[last_ball_unit],
function(rows){
if (rows.length !== 1) // at the same time, direct parents already received
return callback("last ball unit "+last_ball_unit+" not found");
var objLastBallUnitProps = rows[0];
// it can be unstable and have a received (not self-derived) ball
//if (objLastBallUnitProps.ball !== null && objLastBallUnitProps.is_stable === 0)
// throw "last ball "+last_ball+" is unstable";
if (objLastBallUnitProps.ball === null && objLastBallUnitProps.is_stable === 1)
throw Error("last ball unit "+last_ball_unit+" is stable but has no ball");
if (objLastBallUnitProps.is_on_main_chain !== 1)
return callback("last ball "+last_ball+" is not on MC");
if (objLastBallUnitProps.ball && objLastBallUnitProps.ball !== last_ball)
return callback("last_ball "+last_ball+" and last_ball_unit "+last_ball_unit+" do not match");
objValidationState.last_ball_mci = objLastBallUnitProps.main_chain_index;
objValidationState.max_known_mci = objLastBallUnitProps.max_known_mci;
if (objValidationState.max_parent_limci < objValidationState.last_ball_mci)
return callback("last ball unit "+last_ball_unit+" is not included in parents, unit "+objUnit.unit);
readMaxParentLastBallMci(function(max_parent_last_ball_mci){
if (objLastBallUnitProps.is_stable === 1){
// if it were not stable, we wouldn't have had the ball at all
if (objLastBallUnitProps.ball !== last_ball)
return callback("stable: last_ball "+last_ball+" and last_ball_unit "+last_ball_unit+" do not match");
if (objValidationState.last_ball_mci <= 1300000 || max_parent_last_ball_mci === objValidationState.last_ball_mci)
return checkNoSameAddressInDifferentParents();
}
// Last ball is not stable yet in our view. Check if it is stable in view of the parents
main_chain.determineIfStableInLaterUnitsAndUpdateStableMcFlag(conn, last_ball_unit, objUnit.parent_units, objLastBallUnitProps.is_stable, function(bStable, bAdvancedLastStableMci){
/*if (!bStable && objLastBallUnitProps.is_stable === 1){
var eventBus = require('./event_bus.js');
eventBus.emit('nonfatal_error', "last ball is stable, but not stable in parents, unit "+objUnit.unit, new Error());
return checkNoSameAddressInDifferentParents();
}
else */if (!bStable)
return callback(objUnit.unit+": last ball unit "+last_ball_unit+" is not stable in view of your parents "+objUnit.parent_units);
if (!bAdvancedLastStableMci)
return checkNoSameAddressInDifferentParents();
conn.query("SELECT ball FROM balls WHERE unit=?", [last_ball_unit], function(ball_rows){
if (ball_rows.length === 0)
throw Error("last ball unit "+last_ball_unit+" just became stable but ball not found");
if (ball_rows[0].ball !== last_ball)
return callback("last_ball "+last_ball+" and last_ball_unit "+last_ball_unit
+" do not match after advancing stability point");
if (bAdvancedLastStableMci)
objValidationState.bAdvancedLastStableMci = true; // not used
checkNoSameAddressInDifferentParents();
});
});
});
}
);
}
);
}
function validateWitnesses(conn, objUnit, objValidationState, callback){
function validateWitnessListMutations(arrWitnesses){
if (!objUnit.parent_units) // genesis
return callback();
storage.determineIfHasWitnessListMutationsAlongMc(conn, objUnit, last_ball_unit, arrWitnesses, function(err){
if (err && objValidationState.last_ball_mci >= 512000) // do not enforce before the || bug was fixed
return callback(err);
checkNoReferencesInWitnessAddressDefinitions(arrWitnesses);
});
}
function checkNoReferencesInWitnessAddressDefinitions(arrWitnesses){
profiler.start();
var cross = (conf.storage === 'sqlite') ? 'CROSS' : ''; // correct the query planner
conn.query(
"SELECT 1 \n\
FROM address_definition_changes \n\
JOIN definitions USING(definition_chash) \n\
JOIN units AS change_units USING(unit) -- units where the change was declared \n\
JOIN unit_authors USING(definition_chash) \n\
JOIN units AS definition_units ON unit_authors.unit=definition_units.unit -- units where the definition was disclosed \n\
WHERE address_definition_changes.address IN(?) AND has_references=1 \n\
AND change_units.is_stable=1 AND change_units.main_chain_index<=? AND +change_units.sequence='good' \n\
AND definition_units.is_stable=1 AND definition_units.main_chain_index<=? AND +definition_units.sequence='good' \n\
UNION \n\
SELECT 1 \n\
FROM definitions \n\
"+cross+" JOIN unit_authors USING(definition_chash) \n\
JOIN units AS definition_units ON unit_authors.unit=definition_units.unit -- units where the definition was disclosed \n\
WHERE definition_chash IN(?) AND has_references=1 \n\
AND definition_units.is_stable=1 AND definition_units.main_chain_index<=? AND +definition_units.sequence='good' \n\
LIMIT 1",
[arrWitnesses, objValidationState.last_ball_mci, objValidationState.last_ball_mci, arrWitnesses, objValidationState.last_ball_mci],
function(rows){
profiler.stop('validation-witnesses-no-refs');
(rows.length > 0) ? callback("some witnesses have references in their addresses") : checkWitnessedLevelDidNotRetreat(arrWitnesses);
}
);
}
function checkWitnessedLevelDidNotRetreat(arrWitnesses){
storage.determineWitnessedLevelAndBestParent(conn, objUnit.parent_units, arrWitnesses, function(witnessed_level, best_parent_unit){
objValidationState.witnessed_level = witnessed_level;
objValidationState.best_parent_unit = best_parent_unit;
if (objValidationState.last_ball_mci < constants.witnessedLevelMustNotRetreatUpgradeMci) // not enforced
return callback();
storage.readStaticUnitProps(conn, best_parent_unit, function(props){
(witnessed_level >= props.witnessed_level)
? callback()
: callback("witnessed level retreats from "+props.witnessed_level+" to "+witnessed_level);
});
});
}
profiler.start();
var last_ball_unit = objUnit.last_ball_unit;
if (typeof objUnit.witness_list_unit === "string"){
conn.query("SELECT sequence, is_stable, main_chain_index FROM units WHERE unit=?", [objUnit.witness_list_unit], function(unit_rows){
if (unit_rows.length === 0)
return callback("witness list unit "+objUnit.witness_list_unit+" not found");
var objWitnessListUnitProps = unit_rows[0];
if (objWitnessListUnitProps.sequence !== 'good')
return callback("witness list unit "+objUnit.witness_list_unit+" is not serial");
if (objWitnessListUnitProps.is_stable !== 1)
return callback("witness list unit "+objUnit.witness_list_unit+" is not stable");
if (objWitnessListUnitProps.main_chain_index > objValidationState.last_ball_mci)
return callback("witness list unit "+objUnit.witness_list_unit+" must come before last ball");
storage.readWitnessList(conn, objUnit.witness_list_unit, function(arrWitnesses){
if (arrWitnesses.length === 0)
return callback("referenced witness list unit "+objUnit.witness_list_unit+" has no witnesses");
profiler.stop('validation-witnesses-read-list');
validateWitnessListMutations(arrWitnesses);
}, true);
});
}
else if (Array.isArray(objUnit.witnesses) && objUnit.witnesses.length === constants.COUNT_WITNESSES){
var prev_witness = objUnit.witnesses[0];
for (var i=0; i<objUnit.witnesses.length; i++){
var curr_witness = objUnit.witnesses[i];
if (!chash.isChashValid(curr_witness))
return callback("witness address "+curr_witness+" is invalid");
if (i === 0)
continue;
if (curr_witness <= prev_witness)
return callback("wrong order of witnesses, or duplicates");
prev_witness = curr_witness;
}
if (storage.isGenesisUnit(objUnit.unit)){
// addresses might not be known yet, it's ok
validateWitnessListMutations(objUnit.witnesses);
return;
}
// check that all witnesses are already known and their units are good and stable
conn.query(
// address=definition_chash is true in the first appearence of the address
// (not just in first appearence: it can return to its initial definition_chash sometime later)
"SELECT COUNT(DISTINCT address) AS count_stable_good_witnesses FROM unit_authors JOIN units USING(unit) \n\
WHERE address=definition_chash AND +sequence='good' AND is_stable=1 AND main_chain_index<=? AND address IN(?)",
[objValidationState.last_ball_mci, objUnit.witnesses],
function(rows){
if (rows[0].count_stable_good_witnesses !== constants.COUNT_WITNESSES)
return callback("some witnesses are not stable, not serial, or don't come before last ball");
profiler.stop('validation-witnesses-stable');
validateWitnessListMutations(objUnit.witnesses);
}
);
}
else
return callback("no witnesses or not enough witnesses");
}
function validateHeadersCommissionRecipients(objUnit, cb){
if (objUnit.authors.length > 1 && typeof objUnit.earned_headers_commission_recipients !== "object")
return cb("must specify earned_headers_commission_recipients when more than 1 author");
if ("earned_headers_commission_recipients" in objUnit){
if (!isNonemptyArray(objUnit.earned_headers_commission_recipients))
return cb("empty earned_headers_commission_recipients array");
var total_earned_headers_commission_share = 0;
var prev_address = "";
for (var i=0; i<objUnit.earned_headers_commission_recipients.length; i++){
var recipient = objUnit.earned_headers_commission_recipients[i];
if (!isPositiveInteger(recipient.earned_headers_commission_share))
return cb("earned_headers_commission_share must be positive integer");
if (hasFieldsExcept(recipient, ["address", "earned_headers_commission_share"]))
return cb("unknowsn fields in recipient");
if (recipient.address <= prev_address)
return cb("recipient list must be sorted by address");
if (!isValidAddress(recipient.address))
return cb("invalid recipient address checksum");
total_earned_headers_commission_share += recipient.earned_headers_commission_share;
prev_address = recipient.address;
}
if (total_earned_headers_commission_share !== 100)
return cb("sum of earned_headers_commission_share is not 100");
}
cb();
}
function validateAuthors(conn, arrAuthors, objUnit, objValidationState, callback) {
if (arrAuthors.length > constants.MAX_AUTHORS_PER_UNIT) // this is anti-spam. Otherwise an attacker would send nonserial balls signed by zillions of authors.
return callback("too many authors");
objValidationState.arrAddressesWithForkedPath = [];
var prev_address = "";
for (var i=0; i<arrAuthors.length; i++){
var objAuthor = arrAuthors[i];
if (objAuthor.address <= prev_address)
return callback("author addresses not sorted");
prev_address = objAuthor.address;
}
objValidationState.unit_hash_to_sign = objectHash.getUnitHashToSign(objUnit);
async.eachSeries(arrAuthors, function(objAuthor, cb){
validateAuthor(conn, objAuthor, objUnit, objValidationState, cb);
}, callback);
}
function validateAuthor(conn, objAuthor, objUnit, objValidationState, callback){
if (!isStringOfLength(objAuthor.address, 32))
return callback("wrong address length");
if (hasFieldsExcept(objAuthor, ["address", "authentifiers", "definition"]))
return callback("unknown fields in author");
if (!ValidationUtils.isNonemptyObject(objAuthor.authentifiers) && !objUnit.content_hash)
return callback("no authentifiers");
for (var path in objAuthor.authentifiers){
if (!isNonemptyString(objAuthor.authentifiers[path]))
return callback("authentifiers must be nonempty strings");
if (objAuthor.authentifiers[path].length > constants.MAX_AUTHENTIFIER_LENGTH)
return callback("authentifier too long");
}
var bNonserial = false;
var arrAddressDefinition = objAuthor.definition;
if (isNonemptyArray(arrAddressDefinition)){
// todo: check that the address is really new?
validateAuthentifiers(arrAddressDefinition);
}
else if (!("definition" in objAuthor)){
if (!chash.isChashValid(objAuthor.address))
return callback("address checksum invalid");
if (objUnit.content_hash){ // nothing else to check
objValidationState.sequence = 'final-bad';
return callback();
}
// we check signatures using the latest address definition before last ball
storage.readDefinitionByAddress(conn, objAuthor.address, objValidationState.last_ball_mci, {
ifDefinitionNotFound: function(definition_chash){
callback("definition "+definition_chash+" bound to address "+objAuthor.address+" is not defined");
},
ifFound: function(arrAddressDefinition){
validateAuthentifiers(arrAddressDefinition);
}
});
}
else
return callback("bad type of definition");
function validateAuthentifiers(arrAddressDefinition){
Definition.validateAuthentifiers(
conn, objAuthor.address, null, arrAddressDefinition, objUnit, objValidationState, objAuthor.authentifiers,
function(err, res){
if (err) // error in address definition
return callback(err);
if (!res) // wrong signature or the like
return callback("authentifier verification failed");
checkSerialAddressUse();
}
);
}
function findConflictingUnits(handleConflictingUnits){
// var cross = (objValidationState.max_known_mci - objValidationState.max_parent_limci < 1000) ? 'CROSS' : '';
conn.query( // _left_ join forces use of indexes in units
/* "SELECT unit, is_stable \n\
FROM units \n\
"+cross+" JOIN unit_authors USING(unit) \n\
WHERE address=? AND (main_chain_index>? OR main_chain_index IS NULL) AND unit != ?",
[objAuthor.address, objValidationState.max_parent_limci, objUnit.unit],*/
"SELECT unit, is_stable, sequence, level \n\
FROM unit_authors \n\
CROSS JOIN units USING(unit) \n\
WHERE address=? AND _mci>? AND unit != ? \n\
UNION \n\
SELECT unit, is_stable, sequence, level \n\
FROM unit_authors \n\
CROSS JOIN units USING(unit) \n\
WHERE address=? AND _mci IS NULL AND unit != ? \n\
ORDER BY level DESC",
[objAuthor.address, objValidationState.max_parent_limci, objUnit.unit, objAuthor.address, objUnit.unit],
function(rows){
if (rows.length === 0)
return handleConflictingUnits([]);
var bAllSerial = rows.every(function(row){ return (row.sequence === 'good'); });
var arrConflictingUnitProps = [];
async.eachSeries(
rows,
function(row, cb){
graph.determineIfIncludedOrEqual(conn, row.unit, objUnit.parent_units, function(bIncluded){
if (!bIncluded)
arrConflictingUnitProps.push(row);
else if (bAllSerial)
return cb('done'); // all are serial and this one is included, therefore the earlier ones are included too
cb();
});
},
function(){
handleConflictingUnits(arrConflictingUnitProps);
}
);
}
);
}
function checkSerialAddressUse(){
var next = checkNoPendingChangeOfDefinitionChash;
findConflictingUnits(function(arrConflictingUnitProps){
if (arrConflictingUnitProps.length === 0){ // no conflicting units
// we can have 2 authors. If the 1st author gave bad sequence but the 2nd is good then don't overwrite
objValidationState.sequence = objValidationState.sequence || 'good';
return next();
}
var arrConflictingUnits = arrConflictingUnitProps.map(function(objConflictingUnitProps){ return objConflictingUnitProps.unit; });
breadcrumbs.add("========== found conflicting units "+arrConflictingUnits+" =========");
breadcrumbs.add("========== will accept a conflicting unit "+objUnit.unit+" =========");
objValidationState.arrAddressesWithForkedPath.push(objAuthor.address);
objValidationState.arrConflictingUnits = (objValidationState.arrConflictingUnits || []).concat(arrConflictingUnits);
bNonserial = true;
var arrUnstableConflictingUnitProps = arrConflictingUnitProps.filter(function(objConflictingUnitProps){
return (objConflictingUnitProps.is_stable === 0);
});
var bConflictsWithStableUnits = arrConflictingUnitProps.some(function(objConflictingUnitProps){
return (objConflictingUnitProps.is_stable === 1);
});
if (objValidationState.sequence !== 'final-bad') // if it were already final-bad because of 1st author, it can't become temp-bad due to 2nd author
objValidationState.sequence = bConflictsWithStableUnits ? 'final-bad' : 'temp-bad';
var arrUnstableConflictingUnits = arrUnstableConflictingUnitProps.map(function(objConflictingUnitProps){ return objConflictingUnitProps.unit; });
if (bConflictsWithStableUnits) // don't temp-bad the unstable conflicting units
return next();
if (arrUnstableConflictingUnits.length === 0)
return next();
// we don't modify the db during validation, schedule the update for the write
objValidationState.arrAdditionalQueries.push(
{sql: "UPDATE units SET sequence='temp-bad' WHERE unit IN(?) AND +sequence='good'", params: [arrUnstableConflictingUnits]});
next();
});
}
// don't allow contradicting pending keychanges.
// We don't trust pending keychanges even when they are serial, as another unit may arrive and make them nonserial
function checkNoPendingChangeOfDefinitionChash(){
var next = checkNoPendingDefinition;
//var filter = bNonserial ? "AND sequence='good'" : "";
conn.query(
"SELECT unit FROM address_definition_changes JOIN units USING(unit) \n\
WHERE address=? AND (is_stable=0 OR main_chain_index>? OR main_chain_index IS NULL)",
[objAuthor.address, objValidationState.last_ball_mci],
function(rows){
if (rows.length === 0)
return next();
if (!bNonserial || objValidationState.arrAddressesWithForkedPath.indexOf(objAuthor.address) === -1)
return callback("you can't send anything before your last keychange is stable and before last ball");
// from this point, our unit is nonserial
async.eachSeries(
rows,
function(row, cb){
graph.determineIfIncludedOrEqual(conn, row.unit, objUnit.parent_units, function(bIncluded){
if (bIncluded)
console.log("checkNoPendingChangeOfDefinitionChash: unit "+row.unit+" is included");
bIncluded ? cb("found") : cb();
});
},
function(err){
(err === "found")
? callback("you can't send anything before your last included keychange is stable and before last ball (self is nonserial)")
: next();
}
);
}
);
}
// We don't trust pending definitions even when they are serial, as another unit may arrive and make them nonserial,
// then the definition will be removed
function checkNoPendingDefinition(){
//var next = checkNoPendingOrRetrievableNonserialIncluded;
var next = validateDefinition;
//var filter = bNonserial ? "AND sequence='good'" : "";
// var cross = (objValidationState.max_known_mci - objValidationState.last_ball_mci < 1000) ? 'CROSS' : '';
conn.query( // _left_ join forces use of indexes in units
// "SELECT unit FROM units "+cross+" JOIN unit_authors USING(unit) \n\
// WHERE address=? AND definition_chash IS NOT NULL AND ( /* is_stable=0 OR */ main_chain_index>? OR main_chain_index IS NULL)",
// [objAuthor.address, objValidationState.last_ball_mci],
"SELECT unit FROM unit_authors WHERE address=? AND definition_chash IS NOT NULL AND _mci>? \n\
UNION \n\
SELECT unit FROM unit_authors WHERE address=? AND definition_chash IS NOT NULL AND _mci IS NULL",
[objAuthor.address, objValidationState.last_ball_mci, objAuthor.address],
function(rows){
if (rows.length === 0)
return next();
if (!bNonserial || objValidationState.arrAddressesWithForkedPath.indexOf(objAuthor.address) === -1)
return callback("you can't send anything before your last definition is stable and before last ball");
// from this point, our unit is nonserial
async.eachSeries(
rows,
function(row, cb){
graph.determineIfIncludedOrEqual(conn, row.unit, objUnit.parent_units, function(bIncluded){
if (bIncluded)
console.log("checkNoPendingDefinition: unit "+row.unit+" is included");
bIncluded ? cb("found") : cb();
});
},
function(err){
(err === "found")
? callback("you can't send anything before your last included definition is stable and before last ball (self is nonserial)")
: next();
}
);
}
);
}
// This was bad idea. An uncovered nonserial, if not archived, will block new units from this address forever.
/*
function checkNoPendingOrRetrievableNonserialIncluded(){
var next = validateDefinition;
conn.query(
"SELECT lb_units.main_chain_index FROM units JOIN units AS lb_units ON units.last_ball_unit=lb_units.unit \n\
WHERE units.is_on_main_chain=1 AND units.main_chain_index=?",
[objValidationState.last_ball_mci],
function(lb_rows){
var last_ball_of_last_ball_mci = (lb_rows.length > 0) ? lb_rows[0].main_chain_index : 0;
conn.query(
"SELECT unit FROM unit_authors JOIN units USING(unit) \n\
WHERE address=? AND (is_stable=0 OR main_chain_index>?) AND sequence!='good'",
[objAuthor.address, last_ball_of_last_ball_mci],
function(rows){
if (rows.length === 0)
return next();
if (!bNonserial)
return callback("you can't send anything before all your nonserial units are stable and before last ball of last ball");
// from this point, the unit is nonserial
async.eachSeries(
rows,
function(row, cb){
graph.determineIfIncludedOrEqual(conn, row.unit, objUnit.parent_units, function(bIncluded){
if (bIncluded)
console.log("checkNoPendingOrRetrievableNonserialIncluded: unit "+row.unit+" is included");
bIncluded ? cb("found") : cb();
});
},
function(err){
(err === "found")
? callback("you can't send anything before all your included nonserial units are stable \
and lie before last ball of last ball (self is nonserial)")
: next();
}
);
}
);
}
);
}
*/
function validateDefinition(){
if (!("definition" in objAuthor))
return callback();
// the rest assumes that the definition is explicitly defined
var arrAddressDefinition = objAuthor.definition;
storage.readDefinitionByAddress(conn, objAuthor.address, objValidationState.last_ball_mci, {
ifDefinitionNotFound: function(definition_chash){ // first use of the definition_chash (in particular, of the address, when definition_chash=address)
if (objectHash.getChash160(arrAddressDefinition) !== definition_chash)
return callback("wrong definition: "+objectHash.getChash160(arrAddressDefinition) +"!=="+ definition_chash);
callback();
},
ifFound: function(arrAddressDefinition2){ // arrAddressDefinition2 can be different
handleDuplicateAddressDefinition(arrAddressDefinition2);
}
});
}
function handleDuplicateAddressDefinition(arrAddressDefinition){
if (!bNonserial || objValidationState.arrAddressesWithForkedPath.indexOf(objAuthor.address) === -1)
return callback("duplicate definition of address "+objAuthor.address+", bNonserial="+bNonserial);
// todo: investigate if this can split the nodes
// in one particular case, the attacker changes his definition then quickly sends a new ball with the old definition - the new definition will not be active yet
if (objectHash.getChash160(arrAddressDefinition) !== objectHash.getChash160(objAuthor.definition))
return callback("unit definition doesn't match the stored definition");
callback(); // let it be for now. Eventually, at most one of the balls will be declared good
}
}
function validateMessages(conn, arrMessages, objUnit, objValidationState, callback){
console.log("validateMessages "+objUnit.unit);
async.forEachOfSeries(
arrMessages,
function(objMessage, message_index, cb){
validateMessage(conn, objMessage, message_index, objUnit, objValidationState, cb);
},
function(err){
if (err)
return callback(err);
if (!objValidationState.bHasBasePayment)
return callback("no base payment message");
callback();
}
);
}
function validateMessage(conn, objMessage, message_index, objUnit, objValidationState, callback) {
if (typeof objMessage.app !== "string")
return callback("no app");
if (!isStringOfLength(objMessage.payload_hash, constants.HASH_LENGTH))
return callback("wrong payload hash size");
if (typeof objMessage.payload_location !== "string")
return callback("no payload_location");
if (hasFieldsExcept(objMessage, ["app", "payload_hash", "payload_location", "payload", "payload_uri", "payload_uri_hash", "spend_proofs"]))
return callback("unknown fields in message");
if ("spend_proofs" in objMessage){
if (!Array.isArray(objMessage.spend_proofs) || objMessage.spend_proofs.length === 0 || objMessage.spend_proofs.length > constants.MAX_SPEND_PROOFS_PER_MESSAGE)
return callback("spend_proofs must be non-empty array max "+constants.MAX_SPEND_PROOFS_PER_MESSAGE+" elements");
var arrAuthorAddresses = objUnit.authors.map(function(author) { return author.address; } );
// spend proofs are sorted in the same order as their corresponding inputs
//var prev_spend_proof = "";
for (var i=0; i<objMessage.spend_proofs.length; i++){
var objSpendProof = objMessage.spend_proofs[i];
if (typeof objSpendProof !== "object")
return callback("spend_proof must be object");
if (hasFieldsExcept(objSpendProof, ["spend_proof", "address"]))
return callback("unknown fields in spend_proof");
//if (objSpendProof.spend_proof <= prev_spend_proof)
// return callback("spend_proofs not sorted");
if (!isValidBase64(objSpendProof.spend_proof, constants.HASH_LENGTH))
return callback("spend proof "+objSpendProof.spend_proof+" is not a valid base64");