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