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'use strict';
const Reporter = require('../base/reporter').Reporter;
const EncoderBuffer = require('../base/buffer').EncoderBuffer;
const DecoderBuffer = require('../base/buffer').DecoderBuffer;
const assert = require('minimalistic-assert');
// Supported tags
const tags = [
'seq', 'seqof', 'set', 'setof', 'objid', 'bool',
'gentime', 'utctime', 'null_', 'enum', 'int', 'objDesc',
'bitstr', 'bmpstr', 'charstr', 'genstr', 'graphstr', 'ia5str', 'iso646str',
'numstr', 'octstr', 'printstr', 't61str', 'unistr', 'utf8str', 'videostr'
];
// Public methods list
const methods = [
'key', 'obj', 'use', 'optional', 'explicit', 'implicit', 'def', 'choice',
'any', 'contains'
].concat(tags);
// Overrided methods list
const overrided = [
'_peekTag', '_decodeTag', '_use',
'_decodeStr', '_decodeObjid', '_decodeTime',
'_decodeNull', '_decodeInt', '_decodeBool', '_decodeList',
'_encodeComposite', '_encodeStr', '_encodeObjid', '_encodeTime',
'_encodeNull', '_encodeInt', '_encodeBool'
];
function Node(enc, parent, name) {
const state = {};
this._baseState = state;
state.name = name;
state.enc = enc;
state.parent = parent || null;
state.children = null;
// State
state.tag = null;
state.args = null;
state.reverseArgs = null;
state.choice = null;
state.optional = false;
state.any = false;
state.obj = false;
state.use = null;
state.useDecoder = null;
state.key = null;
state['default'] = null;
state.explicit = null;
state.implicit = null;
state.contains = null;
// Should create new instance on each method
if (!state.parent) {
state.children = [];
this._wrap();
}
}
module.exports = Node;
const stateProps = [
'enc', 'parent', 'children', 'tag', 'args', 'reverseArgs', 'choice',
'optional', 'any', 'obj', 'use', 'alteredUse', 'key', 'default', 'explicit',
'implicit', 'contains'
];
Node.prototype.clone = function clone() {
const state = this._baseState;
const cstate = {};
stateProps.forEach(function(prop) {
cstate[prop] = state[prop];
});
const res = new this.constructor(cstate.parent);
res._baseState = cstate;
return res;
};
Node.prototype._wrap = function wrap() {
const state = this._baseState;
methods.forEach(function(method) {
this[method] = function _wrappedMethod() {
const clone = new this.constructor(this);
state.children.push(clone);
return clone[method].apply(clone, arguments);
};
}, this);
};
Node.prototype._init = function init(body) {
const state = this._baseState;
assert(state.parent === null);
body.call(this);
// Filter children
state.children = state.children.filter(function(child) {
return child._baseState.parent === this;
}, this);
assert.equal(state.children.length, 1, 'Root node can have only one child');
};
Node.prototype._useArgs = function useArgs(args) {
const state = this._baseState;
// Filter children and args
const children = args.filter(function(arg) {
return arg instanceof this.constructor;
}, this);
args = args.filter(function(arg) {
return !(arg instanceof this.constructor);
}, this);
if (children.length !== 0) {
assert(state.children === null);
state.children = children;
// Replace parent to maintain backward link
children.forEach(function(child) {
child._baseState.parent = this;
}, this);
}
if (args.length !== 0) {
assert(state.args === null);
state.args = args;
state.reverseArgs = args.map(function(arg) {
if (typeof arg !== 'object' || arg.constructor !== Object)
return arg;
const res = {};
Object.keys(arg).forEach(function(key) {
if (key == (key | 0))
key |= 0;
const value = arg[key];
res[value] = key;
});
return res;
});
}
};
//
// Overrided methods
//
overrided.forEach(function(method) {
Node.prototype[method] = function _overrided() {
const state = this._baseState;
throw new Error(method + ' not implemented for encoding: ' + state.enc);
};
});
//
// Public methods
//
tags.forEach(function(tag) {
Node.prototype[tag] = function _tagMethod() {
const state = this._baseState;
const args = Array.prototype.slice.call(arguments);
assert(state.tag === null);
state.tag = tag;
this._useArgs(args);
return this;
};
});
Node.prototype.use = function use(item) {
assert(item);
const state = this._baseState;
assert(state.use === null);
state.use = item;
return this;
};
Node.prototype.optional = function optional() {
const state = this._baseState;
state.optional = true;
return this;
};
Node.prototype.def = function def(val) {
const state = this._baseState;
assert(state['default'] === null);
state['default'] = val;
state.optional = true;
return this;
};
Node.prototype.explicit = function explicit(num) {
const state = this._baseState;
assert(state.explicit === null && state.implicit === null);
state.explicit = num;
return this;
};
Node.prototype.implicit = function implicit(num) {
const state = this._baseState;
assert(state.explicit === null && state.implicit === null);
state.implicit = num;
return this;
};
Node.prototype.obj = function obj() {
const state = this._baseState;
const args = Array.prototype.slice.call(arguments);
state.obj = true;
if (args.length !== 0)
this._useArgs(args);
return this;
};
Node.prototype.key = function key(newKey) {
const state = this._baseState;
assert(state.key === null);
state.key = newKey;
return this;
};
Node.prototype.any = function any() {
const state = this._baseState;
state.any = true;
return this;
};
Node.prototype.choice = function choice(obj) {
const state = this._baseState;
assert(state.choice === null);
state.choice = obj;
this._useArgs(Object.keys(obj).map(function(key) {
return obj[key];
}));
return this;
};
Node.prototype.contains = function contains(item) {
const state = this._baseState;
assert(state.use === null);
state.contains = item;
return this;
};
//
// Decoding
//
Node.prototype._decode = function decode(input, options) {
const state = this._baseState;
// Decode root node
if (state.parent === null)
return input.wrapResult(state.children[0]._decode(input, options));
let result = state['default'];
let present = true;
let prevKey = null;
if (state.key !== null)
prevKey = input.enterKey(state.key);
// Check if tag is there
if (state.optional) {
let tag = null;
if (state.explicit !== null)
tag = state.explicit;
else if (state.implicit !== null)
tag = state.implicit;
else if (state.tag !== null)
tag = state.tag;
if (tag === null && !state.any) {
// Trial and Error
const save = input.save();
try {
if (state.choice === null)
this._decodeGeneric(state.tag, input, options);
else
this._decodeChoice(input, options);
present = true;
} catch (e) {
present = false;
}
input.restore(save);
} else {
present = this._peekTag(input, tag, state.any);
if (input.isError(present))
return present;
}
}
// Push object on stack
let prevObj;
if (state.obj && present)
prevObj = input.enterObject();
if (present) {
// Unwrap explicit values
if (state.explicit !== null) {
const explicit = this._decodeTag(input, state.explicit);
if (input.isError(explicit))
return explicit;
input = explicit;
}
const start = input.offset;
// Unwrap implicit and normal values
if (state.use === null && state.choice === null) {
let save;
if (state.any)
save = input.save();
const body = this._decodeTag(
input,
state.implicit !== null ? state.implicit : state.tag,
state.any
);
if (input.isError(body))
return body;
if (state.any)
result = input.raw(save);
else
input = body;
}
if (options && options.track && state.tag !== null)
options.track(input.path(), start, input.length, 'tagged');
if (options && options.track && state.tag !== null)
options.track(input.path(), input.offset, input.length, 'content');
// Select proper method for tag
if (state.any) {
// no-op
} else if (state.choice === null) {
result = this._decodeGeneric(state.tag, input, options);
} else {
result = this._decodeChoice(input, options);
}
if (input.isError(result))
return result;
// Decode children
if (!state.any && state.choice === null && state.children !== null) {
state.children.forEach(function decodeChildren(child) {
// NOTE: We are ignoring errors here, to let parser continue with other
// parts of encoded data
child._decode(input, options);
});
}
// Decode contained/encoded by schema, only in bit or octet strings
if (state.contains && (state.tag === 'octstr' || state.tag === 'bitstr')) {
const data = new DecoderBuffer(result);
result = this._getUse(state.contains, input._reporterState.obj)
._decode(data, options);
}
}
// Pop object
if (state.obj && present)
result = input.leaveObject(prevObj);
// Set key
if (state.key !== null && (result !== null || present === true))
input.leaveKey(prevKey, state.key, result);
else if (prevKey !== null)
input.exitKey(prevKey);
return result;
};
Node.prototype._decodeGeneric = function decodeGeneric(tag, input, options) {
const state = this._baseState;
if (tag === 'seq' || tag === 'set')
return null;
if (tag === 'seqof' || tag === 'setof')
return this._decodeList(input, tag, state.args[0], options);
else if (/str$/.test(tag))
return this._decodeStr(input, tag, options);
else if (tag === 'objid' && state.args)
return this._decodeObjid(input, state.args[0], state.args[1], options);
else if (tag === 'objid')
return this._decodeObjid(input, null, null, options);
else if (tag === 'gentime' || tag === 'utctime')
return this._decodeTime(input, tag, options);
else if (tag === 'null_')
return this._decodeNull(input, options);
else if (tag === 'bool')
return this._decodeBool(input, options);
else if (tag === 'objDesc')
return this._decodeStr(input, tag, options);
else if (tag === 'int' || tag === 'enum')
return this._decodeInt(input, state.args && state.args[0], options);
if (state.use !== null) {
return this._getUse(state.use, input._reporterState.obj)
._decode(input, options);
} else {
return input.error('unknown tag: ' + tag);
}
};
Node.prototype._getUse = function _getUse(entity, obj) {
const state = this._baseState;
// Create altered use decoder if implicit is set
state.useDecoder = this._use(entity, obj);
assert(state.useDecoder._baseState.parent === null);
state.useDecoder = state.useDecoder._baseState.children[0];
if (state.implicit !== state.useDecoder._baseState.implicit) {
state.useDecoder = state.useDecoder.clone();
state.useDecoder._baseState.implicit = state.implicit;
}
return state.useDecoder;
};
Node.prototype._decodeChoice = function decodeChoice(input, options) {
const state = this._baseState;
let result = null;
let match = false;
Object.keys(state.choice).some(function(key) {
const save = input.save();
const node = state.choice[key];
try {
const value = node._decode(input, options);
if (input.isError(value))
return false;
result = { type: key, value: value };
match = true;
} catch (e) {
input.restore(save);
return false;
}
return true;
}, this);
if (!match)
return input.error('Choice not matched');
return result;
};
//
// Encoding
//
Node.prototype._createEncoderBuffer = function createEncoderBuffer(data) {
return new EncoderBuffer(data, this.reporter);
};
Node.prototype._encode = function encode(data, reporter, parent) {
const state = this._baseState;
if (state['default'] !== null && state['default'] === data)
return;
const result = this._encodeValue(data, reporter, parent);
if (result === undefined)
return;
if (this._skipDefault(result, reporter, parent))
return;
return result;
};
Node.prototype._encodeValue = function encode(data, reporter, parent) {
const state = this._baseState;
// Decode root node
if (state.parent === null)
return state.children[0]._encode(data, reporter || new Reporter());
let result = null;
// Set reporter to share it with a child class
this.reporter = reporter;
// Check if data is there
if (state.optional && data === undefined) {
if (state['default'] !== null)
data = state['default'];
else
return;
}
// Encode children first
let content = null;
let primitive = false;
if (state.any) {
// Anything that was given is translated to buffer
result = this._createEncoderBuffer(data);
} else if (state.choice) {
result = this._encodeChoice(data, reporter);
} else if (state.contains) {
content = this._getUse(state.contains, parent)._encode(data, reporter);
primitive = true;
} else if (state.children) {
content = state.children.map(function(child) {
if (child._baseState.tag === 'null_')
return child._encode(null, reporter, data);
if (child._baseState.key === null)
return reporter.error('Child should have a key');
const prevKey = reporter.enterKey(child._baseState.key);
if (typeof data !== 'object')
return reporter.error('Child expected, but input is not object');
const res = child._encode(data[child._baseState.key], reporter, data);
reporter.leaveKey(prevKey);
return res;
}, this).filter(function(child) {
return child;
});
content = this._createEncoderBuffer(content);
} else {
if (state.tag === 'seqof' || state.tag === 'setof') {
// TODO(indutny): this should be thrown on DSL level
if (!(state.args && state.args.length === 1))
return reporter.error('Too many args for : ' + state.tag);
if (!Array.isArray(data))
return reporter.error('seqof/setof, but data is not Array');
const child = this.clone();
child._baseState.implicit = null;
content = this._createEncoderBuffer(data.map(function(item) {
const state = this._baseState;
return this._getUse(state.args[0], data)._encode(item, reporter);
}, child));
} else if (state.use !== null) {
result = this._getUse(state.use, parent)._encode(data, reporter);
} else {
content = this._encodePrimitive(state.tag, data);
primitive = true;
}
}
// Encode data itself
if (!state.any && state.choice === null) {
const tag = state.implicit !== null ? state.implicit : state.tag;
const cls = state.implicit === null ? 'universal' : 'context';
if (tag === null) {
if (state.use === null)
reporter.error('Tag could be omitted only for .use()');
} else {
if (state.use === null)
result = this._encodeComposite(tag, primitive, cls, content);
}
}
// Wrap in explicit
if (state.explicit !== null)
result = this._encodeComposite(state.explicit, false, 'context', result);
return result;
};
Node.prototype._encodeChoice = function encodeChoice(data, reporter) {
const state = this._baseState;
const node = state.choice[data.type];
if (!node) {
assert(
false,
data.type + ' not found in ' +
JSON.stringify(Object.keys(state.choice)));
}
return node._encode(data.value, reporter);
};
Node.prototype._encodePrimitive = function encodePrimitive(tag, data) {
const state = this._baseState;
if (/str$/.test(tag))
return this._encodeStr(data, tag);
else if (tag === 'objid' && state.args)
return this._encodeObjid(data, state.reverseArgs[0], state.args[1]);
else if (tag === 'objid')
return this._encodeObjid(data, null, null);
else if (tag === 'gentime' || tag === 'utctime')
return this._encodeTime(data, tag);
else if (tag === 'null_')
return this._encodeNull();
else if (tag === 'int' || tag === 'enum')
return this._encodeInt(data, state.args && state.reverseArgs[0]);
else if (tag === 'bool')
return this._encodeBool(data);
else if (tag === 'objDesc')
return this._encodeStr(data, tag);
else
throw new Error('Unsupported tag: ' + tag);
};
Node.prototype._isNumstr = function isNumstr(str) {
return /^[0-9 ]*$/.test(str);
};
Node.prototype._isPrintstr = function isPrintstr(str) {
return /^[A-Za-z0-9 '()+,-./:=?]*$/.test(str);
};