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chainpad.dist.js
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chainpad.dist.js
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(function(){
var r=function(){var e="function"==typeof require&&require,r=function(i,o,u){o||(o=0);var n=r.resolve(i,o),t=r.m[o][n];if(!t&&e){if(t=e(n))return t}else if(t&&t.c&&(o=t.c,n=t.m,t=r.m[o][t.m],!t))throw new Error('failed to require "'+n+'" from '+o);if(!t)throw new Error('failed to require "'+i+'" from '+u);return t.exports||(t.exports={},t.call(t.exports,t,t.exports,r.relative(n,o))),t.exports};return r.resolve=function(e,n){var i=e,t=e+".js",o=e+"/index.js";return r.m[n][t]&&t?t:r.m[n][o]&&o?o:i},r.relative=function(e,t){return function(n){if("."!=n.charAt(0))return r(n,t,e);var o=e.split("/"),f=n.split("/");o.pop();for(var i=0;i<f.length;i++){var u=f[i];".."==u?o.pop():"."!=u&&o.push(u)}return r(o.join("/"),t,e)}},r}();r.m = [];
r.m[0] = {
"json.sortify": {"c":1,"m":"dist/JSON.sortify.js"},
"fast-diff": {"c":2,"m":"diff.js"},
"Diff.js": function(module, exports, require){
/*@flow*/
/*
* Copyright 2014 XWiki SAS
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
"use strict";
var FastDiff = require('fast-diff');
var transform = function (matches) {
var out = [];
var offset = 0;
var first = true;
var current = {
offset: 0,
toInsert: "",
toRemove: 0,
type: "Operation"
};
matches.forEach(function (el, i) {
if (el[0] === 0) {
if (!first) {
out.push(current);
offset = current.offset + current.toRemove;
current = {
offset: offset,
toInsert: "",
toRemove: 0,
type: "Operation"
};
}
offset += el[1].length;
current.offset = offset;
} else if (el[0] === 1) {
current.toInsert = el[1];
} else {
current.toRemove = el[1].length;
}
if (i === matches.length - 1 && el[0] !== 0) {
out.push(current);
}
if (first) { first = false; }
});
return out;
};
module.exports.diff = function (oldS /*:string*/, newS /*:string*/) {
return transform(FastDiff(oldS, newS));
};
},
"Patch.js": function(module, exports, require){
/*@flow*/
/*
* Copyright 2014 XWiki SAS
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
"use strict";
var Common = require('./Common');
var Operation = require('./Operation');
var Sha = require('./sha256');
var Patch = module.exports;
/*::
import type {
Operation_t,
Operation_Packed_t,
Operation_Simplify_t,
Operation_Transform_t
} from './Operation';
import type { Sha256_t } from './sha256';
export type Patch_t = {
type: 'Patch',
operations: Array<Operation_t>,
parentHash: Sha256_t,
isCheckpoint: boolean,
mut: {
inverseOf: ?Patch_t,
}
};
export type Patch_Packed_t = Array<Operation_Packed_t|Sha256_t>;
export type Patch_Transform_t = (
toTransform:Array<Operation_t>,
transformBy:Array<Operation_t>,
state0:string
) => Array<Operation_t>;
*/
var create = Patch.create = function (parentHash /*:Sha256_t*/, isCheckpoint /*:?boolean*/) {
var out = Object.freeze({
type: 'Patch',
operations: [],
parentHash: parentHash,
isCheckpoint: !!isCheckpoint,
mut: {
inverseOf: undefined
}
});
if (isCheckpoint) {
out.mut.inverseOf = out;
}
return out;
};
var check = Patch.check = function (patch /*:any*/, docLength_opt /*:?number*/) /*:Patch_t*/ {
Common.assert(patch.type === 'Patch');
Common.assert(Array.isArray(patch.operations));
Common.assert(/^[0-9a-f]{64}$/.test(patch.parentHash));
for (var i = patch.operations.length - 1; i >= 0; i--) {
Operation.check(patch.operations[i], docLength_opt);
if (i > 0) {
Common.assert(!Operation.shouldMerge(patch.operations[i], patch.operations[i-1]));
}
if (typeof(docLength_opt) === 'number') {
docLength_opt += Operation.lengthChange(patch.operations[i]);
}
}
if (patch.isCheckpoint) {
Common.assert(patch.operations.length === 1);
Common.assert(patch.operations[0].offset === 0);
if (typeof(docLength_opt) === 'number') {
Common.assert(!docLength_opt || patch.operations[0].toRemove === docLength_opt);
}
}
return patch;
};
Patch.toObj = function (patch /*:Patch_t*/) {
if (Common.PARANOIA) { check(patch); }
var out /*:Array<Operation_Packed_t|Sha256_t>*/ = new Array(patch.operations.length+1);
var i;
for (i = 0; i < patch.operations.length; i++) {
out[i] = Operation.toObj(patch.operations[i]);
}
out[i] = patch.parentHash;
return out;
};
Patch.fromObj = function (obj /*:Patch_Packed_t*/, isCheckpoint /*:?boolean*/) {
Common.assert(Array.isArray(obj) && obj.length > 0);
var patch = create(Sha.check(obj[obj.length-1]), isCheckpoint);
var i;
for (i = 0; i < obj.length-1; i++) {
patch.operations[i] = Operation.fromObj(obj[i]);
}
if (Common.PARANOIA) { check(patch); }
return patch;
};
var hash = function (text) {
return Sha.hex_sha256(text);
};
var addOperation = Patch.addOperation = function (patch /*:Patch_t*/, op /*:Operation_t*/) {
if (Common.PARANOIA) {
check(patch);
Operation.check(op);
}
for (var i = 0; i < patch.operations.length; i++) {
if (Operation.shouldMerge(patch.operations[i], op)) {
var maybeOp = Operation.merge(patch.operations[i], op);
patch.operations.splice(i,1);
if (maybeOp === null) { return; }
op = maybeOp;
i--;
} else {
var out = Operation.rebase(patch.operations[i], op);
if (out === op) {
// op could not be rebased further, insert it here to keep the list ordered.
patch.operations.splice(i,0,op);
return;
} else {
op = out;
// op was rebased, try rebasing it against the next operation.
}
}
}
patch.operations.push(op);
if (Common.PARANOIA) { check(patch); }
};
Patch.createCheckpoint = function (
parentContent /*:string*/,
checkpointContent /*:string*/,
parentContentHash_opt /*:?string*/)
{
var op = Operation.create(0, parentContent.length, checkpointContent);
if (Common.PARANOIA && parentContentHash_opt) {
Common.assert(parentContentHash_opt === hash(parentContent));
}
parentContentHash_opt = parentContentHash_opt || hash(parentContent);
var out = create(parentContentHash_opt, true);
out.operations[0] = op;
return out;
};
var clone = Patch.clone = function (patch /*:Patch_t*/) {
if (Common.PARANOIA) { check(patch); }
var out = create(patch.parentHash, patch.isCheckpoint);
for (var i = 0; i < patch.operations.length; i++) {
out.operations[i] = patch.operations[i];
}
return out;
};
Patch.merge = function (oldPatch /*:Patch_t*/, newPatch /*:Patch_t*/) {
if (Common.PARANOIA) {
check(oldPatch);
check(newPatch);
}
if (oldPatch.isCheckpoint) {
Common.assert(newPatch.parentHash === oldPatch.parentHash);
if (newPatch.isCheckpoint) {
return create(oldPatch.parentHash);
}
return clone(newPatch);
} else if (newPatch.isCheckpoint) {
return clone(oldPatch);
}
oldPatch = clone(oldPatch);
for (var i = newPatch.operations.length-1; i >= 0; i--) {
addOperation(oldPatch, newPatch.operations[i]);
}
return oldPatch;
};
Patch.apply = function (patch /*:Patch_t*/, doc /*:string*/)
{
if (Common.PARANOIA) {
check(patch);
Common.assert(typeof(doc) === 'string');
Common.assert(Sha.hex_sha256(doc) === patch.parentHash);
}
var newDoc = doc;
for (var i = patch.operations.length-1; i >= 0; i--) {
newDoc = Operation.apply(patch.operations[i], newDoc);
}
return newDoc;
};
Patch.lengthChange = function (patch /*:Patch_t*/)
{
if (Common.PARANOIA) { check(patch); }
var out = 0;
for (var i = 0; i < patch.operations.length; i++) {
out += Operation.lengthChange(patch.operations[i]);
}
return out;
};
Patch.invert = function (patch /*:Patch_t*/, doc /*:string*/)
{
if (Common.PARANOIA) {
check(patch);
Common.assert(typeof(doc) === 'string');
Common.assert(Sha.hex_sha256(doc) === patch.parentHash);
}
var newDoc = doc;
var operations = new Array(patch.operations.length);
for (var i = patch.operations.length-1; i >= 0; i--) {
operations[i] = Operation.invert(patch.operations[i], newDoc);
newDoc = Operation.apply(patch.operations[i], newDoc);
}
var opOffsets = new Array(patch.operations.length);
(function () {
for (var i = operations.length-1; i >= 0; i--) {
opOffsets[i] = operations[i].offset;
for (var j = i - 1; j >= 0; j--) {
opOffsets[i] += operations[j].toRemove - operations[j].toInsert.length;
}
}
}());
var rpatch = create(Sha.hex_sha256(newDoc), patch.isCheckpoint);
rpatch.operations.splice(0, rpatch.operations.length);
for (var j = 0; j < operations.length; j++) {
rpatch.operations[j] =
Operation.create(opOffsets[j], operations[j].toRemove, operations[j].toInsert);
}
if (Common.PARANOIA) { check(rpatch); }
return rpatch;
};
Patch.simplify = function (
patch /*:Patch_t*/,
doc /*:string*/,
operationSimplify /*:Operation_Simplify_t*/ )
{
if (Common.PARANOIA) {
check(patch);
Common.assert(typeof(doc) === 'string');
Common.assert(Sha.hex_sha256(doc) === patch.parentHash);
}
var spatch = create(patch.parentHash);
var newDoc = doc;
var outOps = [];
var j = 0;
for (var i = patch.operations.length-1; i >= 0; i--) {
var outOp = operationSimplify(patch.operations[i], newDoc, Operation.simplify);
if (outOp) {
newDoc = Operation.apply(outOp, newDoc);
outOps[j++] = outOp;
}
}
Array.prototype.push.apply(spatch.operations, outOps.reverse());
if (!spatch.operations[0]) {
spatch.operations.shift();
}
if (Common.PARANOIA) {
check(spatch);
}
return spatch;
};
Patch.equals = function (patchA /*:Patch_t*/, patchB /*:Patch_t*/) {
if (patchA.operations.length !== patchB.operations.length) { return false; }
for (var i = 0; i < patchA.operations.length; i++) {
if (!Operation.equals(patchA.operations[i], patchB.operations[i])) { return false; }
}
return true;
};
var isCheckpointOp = function (op, text) {
return op.offset === 0 && op.toRemove === text.length && op.toInsert === text;
};
Patch.transform = function (
toTransform /*:Patch_t*/,
transformBy /*:Patch_t*/,
doc /*:string*/,
patchTransformer /*:Patch_Transform_t*/ )
{
if (Common.PARANOIA) {
check(toTransform, doc.length);
check(transformBy, doc.length);
if (Sha.hex_sha256(doc) !== toTransform.parentHash) { throw new Error("wrong hash"); }
}
if (toTransform.parentHash !== transformBy.parentHash) { throw new Error(); }
var afterTransformBy = Patch.apply(transformBy, doc);
var out = create(transformBy.mut.inverseOf
? transformBy.mut.inverseOf.parentHash
: Sha.hex_sha256(afterTransformBy),
toTransform.isCheckpoint
);
if (transformBy.operations.length === 0) { return clone(toTransform); }
if (toTransform.operations.length === 0) {
if (toTransform.isCheckpoint) { throw new Error(); }
return out;
}
if (toTransform.isCheckpoint ||
(toTransform.operations.length === 1 && isCheckpointOp(toTransform.operations[0], doc)))
{
throw new Error("Attempting to transform a checkpoint, this should not happen");
}
if (transformBy.operations.length === 1 && isCheckpointOp(transformBy.operations[0], doc)) {
if (!transformBy.isCheckpoint) { throw new Error(); }
return toTransform;
}
if (transformBy.isCheckpoint) { throw new Error(); }
var ops = patchTransformer(toTransform.operations, transformBy.operations, doc);
Array.prototype.push.apply(out.operations, ops);
if (Common.PARANOIA) {
check(out, afterTransformBy.length);
}
return out;
};
Patch.random = function (doc /*:string*/, opCount /*:?number*/) {
Common.assert(typeof(doc) === 'string');
opCount = opCount || (Math.floor(Math.random() * 30) + 1);
var patch = create(Sha.hex_sha256(doc));
var docLength = doc.length;
while (opCount-- > 0) {
var op = Operation.random(docLength);
docLength += Operation.lengthChange(op);
addOperation(patch, op);
}
check(patch);
return patch;
};
Object.freeze(module.exports);
},
"SHA256.js": function(module, exports, require){
/* A JavaScript implementation of the Secure Hash Algorithm, SHA-256
* Version 0.3 Copyright Angel Marin 2003-2004 - http://anmar.eu.org/
* Distributed under the BSD License
* Some bits taken from Paul Johnston's SHA-1 implementation
*/
(function () {
var chrsz = 8; /* bits per input character. 8 - ASCII; 16 - Unicode */
function safe_add (x, y) {
var lsw = (x & 0xFFFF) + (y & 0xFFFF);
var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
return (msw << 16) | (lsw & 0xFFFF);
}
function S (X, n) {return ( X >>> n ) | (X << (32 - n));}
function R (X, n) {return ( X >>> n );}
function Ch(x, y, z) {return ((x & y) ^ ((~x) & z));}
function Maj(x, y, z) {return ((x & y) ^ (x & z) ^ (y & z));}
function Sigma0256(x) {return (S(x, 2) ^ S(x, 13) ^ S(x, 22));}
function Sigma1256(x) {return (S(x, 6) ^ S(x, 11) ^ S(x, 25));}
function Gamma0256(x) {return (S(x, 7) ^ S(x, 18) ^ R(x, 3));}
function Gamma1256(x) {return (S(x, 17) ^ S(x, 19) ^ R(x, 10));}
function newArray (n) {
var a = [];
for (;n>0;n--) {
a.push(undefined);
}
return a;
}
function core_sha256 (m, l) {
var K = [0x428A2F98,0x71374491,0xB5C0FBCF,0xE9B5DBA5,0x3956C25B,0x59F111F1,0x923F82A4,0xAB1C5ED5,0xD807AA98,0x12835B01,0x243185BE,0x550C7DC3,0x72BE5D74,0x80DEB1FE,0x9BDC06A7,0xC19BF174,0xE49B69C1,0xEFBE4786,0xFC19DC6,0x240CA1CC,0x2DE92C6F,0x4A7484AA,0x5CB0A9DC,0x76F988DA,0x983E5152,0xA831C66D,0xB00327C8,0xBF597FC7,0xC6E00BF3,0xD5A79147,0x6CA6351,0x14292967,0x27B70A85,0x2E1B2138,0x4D2C6DFC,0x53380D13,0x650A7354,0x766A0ABB,0x81C2C92E,0x92722C85,0xA2BFE8A1,0xA81A664B,0xC24B8B70,0xC76C51A3,0xD192E819,0xD6990624,0xF40E3585,0x106AA070,0x19A4C116,0x1E376C08,0x2748774C,0x34B0BCB5,0x391C0CB3,0x4ED8AA4A,0x5B9CCA4F,0x682E6FF3,0x748F82EE,0x78A5636F,0x84C87814,0x8CC70208,0x90BEFFFA,0xA4506CEB,0xBEF9A3F7,0xC67178F2];
var HASH = [0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19];
var W = newArray(64);
var a, b, c, d, e, f, g, h, i, j;
var T1, T2;
/* append padding */
m[l >> 5] |= 0x80 << (24 - l % 32);
m[((l + 64 >> 9) << 4) + 15] = l;
for ( var i = 0; i<m.length; i+=16 ) {
a = HASH[0]; b = HASH[1]; c = HASH[2]; d = HASH[3];
e = HASH[4]; f = HASH[5]; g = HASH[6]; h = HASH[7];
for ( var j = 0; j<64; j++) {
if (j < 16) {
W[j] = m[j + i];
} else {
W[j] = safe_add(safe_add(safe_add(Gamma1256(
W[j - 2]), W[j - 7]), Gamma0256(W[j - 15])), W[j - 16]);
}
T1 = safe_add(safe_add(safe_add(
safe_add(h, Sigma1256(e)), Ch(e, f, g)), K[j]), W[j]);
T2 = safe_add(Sigma0256(a), Maj(a, b, c));
h = g; g = f; f = e; e = safe_add(d, T1);
d = c; c = b; b = a; a = safe_add(T1, T2);
}
HASH[0] = safe_add(a, HASH[0]); HASH[1] = safe_add(b, HASH[1]);
HASH[2] = safe_add(c, HASH[2]); HASH[3] = safe_add(d, HASH[3]);
HASH[4] = safe_add(e, HASH[4]); HASH[5] = safe_add(f, HASH[5]);
HASH[6] = safe_add(g, HASH[6]); HASH[7] = safe_add(h, HASH[7]);
}
return HASH;
}
function str2binb (str) {
var bin = Array();
var mask = (1 << chrsz) - 1;
for(var i = 0; i < str.length * chrsz; i += chrsz)
bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (24 - i%32);
return bin;
}
function binb2hex (binarray) {
var hexcase = 0; /* hex output format. 0 - lowercase; 1 - uppercase */
var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
var str = "";
for (var i = 0; i < binarray.length * 4; i++) {
str += hex_tab.charAt((binarray[i>>2] >> ((3 - i%4)*8+4)) & 0xF) +
hex_tab.charAt((binarray[i>>2] >> ((3 - i%4)*8 )) & 0xF);
}
return str;
}
function hex_sha256(s){
return binb2hex(core_sha256(str2binb(s),s.length * chrsz));
}
module.exports.hex_sha256 = hex_sha256;
}());
},
"Common.js": function(module, exports, require){
/*@flow*/
/* globals localStorage, window */
/*
* Copyright 2014 XWiki SAS
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
"use strict";
module.exports.global = (function () {
if (typeof(self) !== 'undefined') { return self; }
if (typeof(global) !== 'undefined') { return global; }
if (typeof(window) !== 'undefined') { return window; }
throw new Error("no self, nor global, nor window");
}());
var cfg = function (name) {
if (typeof(localStorage) !== 'undefined' && localStorage[name]) {
return localStorage[name];
}
// flow thinks global may be undefined
return module.exports.global[name];
};
var PARANOIA = module.exports.PARANOIA = cfg("ChainPad_PARANOIA");
/* Good testing but slooooooooooow */
module.exports.VALIDATE_ENTIRE_CHAIN_EACH_MSG = cfg("ChainPad_VALIDATE_ENTIRE_CHAIN_EACH_MSG");
/* throw errors over non-compliant messages which would otherwise be treated as invalid */
module.exports.TESTING = cfg("ChainPad_TESTING");
module.exports.assert = function (expr /*:any*/) {
if (!expr) { throw new Error("Failed assertion"); }
};
module.exports.isUint = function (integer /*:number*/) {
return (typeof(integer) === 'number') &&
(Math.floor(integer) === integer) &&
(integer >= 0);
};
module.exports.randomASCII = function (length /*:number*/) {
var content = [];
for (var i = 0; i < length; i++) {
content[i] = String.fromCharCode( Math.floor(Math.random()*256) % 57 + 65 );
}
return content.join('');
};
module.exports.strcmp = function (a /*:string*/, b /*:string*/) {
if (PARANOIA && typeof(a) !== 'string') { throw new Error(); }
if (PARANOIA && typeof(b) !== 'string') { throw new Error(); }
return ( (a === b) ? 0 : ( (a > b) ? 1 : -1 ) );
};
Object.freeze(module.exports);
},
"sha256.js": function(module, exports, require){
/*@flow*/
/*
* Copyright 2014 XWiki SAS
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
var asm_sha256 = require('./sha256/exports.js');
var old = require('./SHA256.js');
var Common = require('./Common');
/*::
export type Sha256_t = string;
*/
var brokenTextEncode = function (str) {
var out = new Uint8Array(str.length);
for (var i = 0; i < str.length; i++) {
out[i] = str.charCodeAt(i) & 0xff;
}
return out;
};
module.exports.check = function (hex /*:any*/) /*:Sha256_t*/ {
if (typeof(hex) !== 'string') { throw new Error(); }
if (!/[a-f0-9]{64}/.test(hex)) { throw new Error(); }
return hex;
};
module.exports.hex_sha256 = function (d /*:string*/) /*:Sha256_t*/ {
d = d+'';
var ret = asm_sha256.hex(brokenTextEncode(d));
if (Common.PARANOIA) {
var oldHash = old.hex_sha256(d);
if (oldHash !== ret) {
try {
throw new Error();
} catch (e) {
console.log({
hashErr: e,
badHash: d,
asmHasher: asm_sha256.hex,
oldHasher: old.hex_sha256
});
}
return oldHash;
}
}
return ret;
};
Object.freeze(module.exports);
},
"Message.js": function(module, exports, require){
/*@flow*/
/*
* Copyright 2014 XWiki SAS
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
"use strict";
var Common = require('./Common');
//var Operation = require('./Operation');
var Patch = require('./Patch');
var Sha = require('./sha256');
var Message = module.exports;
var PATCH = Message.PATCH = 2;
var CHECKPOINT = Message.CHECKPOINT = 4;
/*::
import type { Sha256_t } from './sha256'
import type { Patch_t } from './Patch'
export type Message_Type_t = 2 | 4;
export type Message_t = {
type: 'Message',
messageType: Message_Type_t,
content: Patch_t,
lastMsgHash: Sha256_t,
hashOf: Sha256_t,
mut: {
parentCount: ?number,
isInitialMessage: boolean,
parent: ?Message_t,
isFromMe: ?boolean,
time: ?number,
author: ?string,
serverHash: ?string,
}
}
*/
var check = Message.check = function(msg /*:any*/) /*:Message_t*/ {
Common.assert(msg.type === 'Message');
Common.assert(msg.messageType === PATCH || msg.messageType === CHECKPOINT);
Patch.check(msg.content);
Common.assert(typeof(msg.lastMsgHash) === 'string');
return msg;
};
var DUMMY_HASH /*:Sha256_t*/ = "";
var create = Message.create = function (
type /*:Message_Type_t*/,
content /*:Patch_t*/,
lastMsgHash /*:Sha256_t*/) /*:Message_t*/
{
var msg = {
type: 'Message',
messageType: type,
content: content,
lastMsgHash: lastMsgHash,
hashOf: DUMMY_HASH,
mut: {
parentCount: undefined,
isInitialMessage: false,
isFromMe: false,
parent: undefined,
time: undefined,
author: undefined,
serverHash: undefined,
}
};
msg.hashOf = hashOf(msg);
if (Common.PARANOIA) { check(msg); }
return Object.freeze(msg);
};
// $FlowFixMe doesn't like the toString()
var toString = Message.toStr = Message.toString = function (msg /*:Message_t*/) {
if (Common.PARANOIA) { check(msg); }
if (msg.messageType === PATCH || msg.messageType === CHECKPOINT) {
if (!msg.content) { throw new Error(); }
return JSON.stringify([msg.messageType, Patch.toObj(msg.content), msg.lastMsgHash]);
} else {
throw new Error();
}
};
Message.fromString = function (str /*:string*/) /*:Message_t*/ {
var obj = {};
if (typeof(str) === "object") {
obj = str;
str = str.msg;
}
var m = JSON.parse(str);
if (m[0] !== CHECKPOINT && m[0] !== PATCH) { throw new Error("invalid message type " + m[0]); }
var msg = create(m[0], Patch.fromObj(m[1], (m[0] === CHECKPOINT)), m[2]);
msg.mut.author = obj.author;
msg.mut.time = obj.time && new Date(obj.time);
msg.mut.serverHash = obj.serverHash;
return Object.freeze(msg);
};
var hashOf = Message.hashOf = function (msg /*:Message_t*/) {
if (Common.PARANOIA) { check(msg); }
var hash = Sha.hex_sha256(toString(msg));
return hash;
};
Object.freeze(module.exports);
},
"ChainPad.js": function(module, exports, require){
/*@flow*/
/*
* Copyright 2014 XWiki SAS
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
"use strict";
var Common = module.exports.Common = require('./Common');
var Operation = module.exports.Operation = require('./Operation');
var Patch = module.exports.Patch = require('./Patch');
var Message = module.exports.Message = require('./Message');
var Sha = module.exports.Sha = require('./sha256');
var Diff = module.exports.Diff = require('./Diff');
var TextTransformer = module.exports.TextTransformer = require('./transform/TextTransformer');
module.exports.NaiveJSONTransformer = require('./transform/NaiveJSONTransformer');
module.exports.SmartJSONTransformer = require('./transform/SmartJSONTransformer');
// hex_sha256('')
var EMPTY_STR_HASH = module.exports.EMPTY_STR_HASH =
'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855';
var ZERO = '0000000000000000000000000000000000000000000000000000000000000000';
// Default number of patches between checkpoints (patches older than this will be pruned)
// default for realtime.config.checkpointInterval
var DEFAULT_CHECKPOINT_INTERVAL = 50;
// Default number of milliseconds to wait before syncing to the server
var DEFAULT_AVERAGE_SYNC_MILLISECONDS = 300;
// By default, we allow checkpoints at any place but if this is set true, we will blow up on chains
// which have checkpoints not where we expect them to be.
var DEFAULT_STRICT_CHECKPOINT_VALIDATION = false;
var debug = function (realtime, msg) {
if (realtime.logLevel > 1) {
console.log("[" + realtime.userName + "] " + msg);
}
};
var warn = function (realtime, msg) {
if (realtime.logLevel > 0) {
console.error("[" + realtime.userName + "] " + msg);
}
};
var schedule = function (realtime, func, timeout) {
if (realtime.aborted) { return; }
if (!timeout) {
timeout = Math.floor(Math.random() * 2 * realtime.config.avgSyncMilliseconds);
}
var to = setTimeout(function () {
realtime.schedules.splice(realtime.schedules.indexOf(to), 1);
func();
}, timeout);
realtime.schedules.push(to);
return to;
};
var unschedule = function (realtime, schedule) {
var index = realtime.schedules.indexOf(schedule);
if (index > -1) {
realtime.schedules.splice(index, 1);
}
clearTimeout(schedule);
};
var onMessage = function (realtime, message, callback /*:(?string)=>void*/) {
if (!realtime.messageHandlers.length) {
callback("no onMessage() handler registered");
}
try {
realtime.messageHandlers.forEach(function (handler) {
handler(message, function () {
callback.apply(null, arguments);
callback = function () { };
});
});
} catch (e) {
callback(e.stack);
}
};
var sendMessage = function (realtime, msg, callback, timeSent) {
var strMsg = Message.toStr(msg);
onMessage(realtime, strMsg, function (err) {
if (err) {
debug(realtime, "Posting to server failed [" + err + "]");
realtime.pending = null;
realtime.syncSchedule = schedule(realtime, function () { sync(realtime); });
} else {
var pending = realtime.pending;
realtime.pending = null;
if (!pending) { throw new Error(); }
Common.assert(pending.hash === msg.hashOf);
if (handleMessage(realtime, strMsg, true)) {
realtime.timeOfLastSuccess = +new Date();
realtime.lag = +new Date() - pending.timeSent;
} else {
debug(realtime, "Our message [" + msg.hashOf + "] failed validation");
}
pending.callback();
}
});
/*
var timeout = schedule(realtime, function () {
debug(realtime, "Failed to send message [" + msg.hashOf + "] to server");
var pending = realtime.pending;
if (pending) {
//var timeSent = pending.timeSent;
realtime.pending = null;
realtime.syncSchedule = -1;
}
sync(realtime, 0);
if (!pending) {
throw new Error("INTERNAL ERROR: Message timed out but no realtime.pending");
}
}, 10000 + (Math.random() * 5000));
*/
if (realtime.pending) { throw new Error("there is already a pending message"); }
if (realtime.timeOfLastSuccess === -1) { realtime.timeOfLastSuccess = +new Date(); }
realtime.pending = {
hash: msg.hashOf,
timeSent: timeSent || +new Date(),
callback: function () {
//unschedule(realtime, timeout);
realtime.syncSchedule = schedule(realtime, function () { sync(realtime); }, 0);
callback();
}
};
if (Common.PARANOIA) { check(realtime); }
};
var settle = function (realtime) {
var onSettle = realtime.onSettle;
realtime.onSettle = [];
onSettle.forEach(function (handler) {
try {
handler();
} catch (e) {
warn(realtime, "Error in onSettle handler [" + e.stack + "]");
}
});
};
var inversePatch = function (patch) {
if (!patch.mut.inverseOf) { throw new Error(); }
return patch.mut.inverseOf;
};
var sync = function (realtime, timeSent) {
if (Common.PARANOIA) { check(realtime); }
if (realtime.syncSchedule && !realtime.pending) {
unschedule(realtime, realtime.syncSchedule);
realtime.syncSchedule = null;
} else {
//debug(realtime, "already syncing...");
// we're currently waiting on something from the server.
return;
}
realtime.uncommitted = Patch.simplify(
realtime.uncommitted, realtime.authDoc, realtime.config.operationSimplify);
if (realtime.uncommitted.operations.length === 0) {
//debug(realtime, "No data to sync to the server, sleeping");
settle(realtime);
realtime.timeOfLastSuccess = +new Date();
realtime.syncSchedule = schedule(realtime, function () { sync(realtime); });
return;
}
var pc = parentCount(realtime, realtime.best) + 1;
if ((pc % realtime.config.checkpointInterval) === 0) {
var best = realtime.best;
debug(realtime, "Sending checkpoint (interval [" + realtime.config.checkpointInterval +
"]) patch no [" + pc + "]");
debug(realtime, parentCount(realtime, realtime.best));
if (!best || !best.content || !inversePatch(best.content)) { throw new Error(); }
var cpp = Patch.createCheckpoint(realtime.authDoc,
realtime.authDoc,
inversePatch(best.content).parentHash);
var cp = Message.create(Message.CHECKPOINT, cpp, best.hashOf);
sendMessage(realtime, cp, function () {
debug(realtime, "Checkpoint sent and accepted");
}, timeSent);
return;
}
var msg;
if (realtime.setContentPatch) {
msg = realtime.setContentPatch;
} else {
msg = Message.create(Message.PATCH, realtime.uncommitted, realtime.best.hashOf);
}
sendMessage(realtime, msg, function () {
//debug(realtime, "patch sent");
if (realtime.setContentPatch) {
debug(realtime, "initial Ack received [" + msg.hashOf + "]");
realtime.setContentPatch = null;
}
}, timeSent);
};
var storeMessage = function (realtime, msg) {
Common.assert(msg.lastMsgHash);
Common.assert(msg.hashOf);
realtime.messages[msg.hashOf] = msg;
(realtime.messagesByParent[msg.lastMsgHash] =
realtime.messagesByParent[msg.lastMsgHash] || []).push(msg);
};
var forgetMessage = function (realtime, msg) {
Common.assert(msg.lastMsgHash);
Common.assert(msg.hashOf);
delete realtime.messages[msg.hashOf];
var list = realtime.messagesByParent[msg.lastMsgHash];
Common.assert(list.indexOf(msg) > -1);