662 lines
31 KiB
JavaScript
662 lines
31 KiB
JavaScript
/* eslint new-cap: 0 */
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'use strict';
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const imapFormalSyntax = require('./imap-formal-syntax');
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const STATE_ATOM = 0x001;
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const STATE_LITERAL = 0x002;
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const STATE_NORMAL = 0x003;
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const STATE_PARTIAL = 0x004;
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const STATE_SEQUENCE = 0x005;
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const STATE_STRING = 0x006;
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const STATE_TEXT = 0x007;
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const RE_DIGITS = /^\d+$/;
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const RE_SINGLE_DIGIT = /^\d$/;
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class TokenParser {
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constructor(parent, startPos, str, options) {
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this.str = (str || '').toString();
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this.options = options || {};
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this.parent = parent;
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this.tree = this.currentNode = this.createNode();
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this.pos = startPos || 0;
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this.currentNode.type = 'TREE';
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this.state = STATE_NORMAL;
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}
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async getAttributes() {
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await this.processString();
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const attributes = [];
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let branch = attributes;
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let walk = async node => {
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let curBranch = branch;
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let elm;
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let partial;
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if (!node.isClosed && node.type === 'SEQUENCE' && node.value === '*') {
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node.isClosed = true;
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node.type = 'ATOM';
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}
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// If the node was never closed, throw it
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if (!node.isClosed) {
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let error = new Error(`Unexpected end of input at position ${this.pos + this.str.length - 1} [E9]`);
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error.code = 'ParserError9';
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error.parserContext = { input: this.str, pos: this.pos + this.str.length - 1 };
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throw error;
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}
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let type = (node.type || '').toString().toUpperCase();
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switch (type) {
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case 'LITERAL':
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case 'STRING':
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case 'SEQUENCE':
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elm = {
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type: node.type.toUpperCase(),
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value: node.value
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};
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branch.push(elm);
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break;
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case 'ATOM':
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if (node.value.toUpperCase() === 'NIL') {
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branch.push(null);
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break;
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}
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elm = {
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type: node.type.toUpperCase(),
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value: node.value
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};
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branch.push(elm);
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break;
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case 'SECTION':
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branch = branch[branch.length - 1].section = [];
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break;
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case 'LIST':
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elm = [];
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branch.push(elm);
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branch = elm;
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break;
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case 'PARTIAL':
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partial = node.value.split('.').map(Number);
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branch[branch.length - 1].partial = partial;
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break;
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}
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for (let childNode of node.childNodes) {
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await walk(childNode);
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}
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branch = curBranch;
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};
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await walk(this.tree);
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return attributes;
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}
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createNode(parentNode, startPos) {
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let node = {
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childNodes: [],
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type: false,
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value: '',
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isClosed: true
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};
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if (parentNode) {
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node.parentNode = parentNode;
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}
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if (typeof startPos === 'number') {
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node.startPos = startPos;
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}
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if (parentNode) {
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parentNode.childNodes.push(node);
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}
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return node;
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}
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async processString() {
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let chr, i, len;
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const checkSP = () => {
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// jump to the next non whitespace pos
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while (this.str.charAt(i + 1) === ' ') {
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i++;
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}
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};
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for (i = 0, len = this.str.length; i < len; i++) {
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chr = this.str.charAt(i);
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switch (this.state) {
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case STATE_NORMAL:
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switch (chr) {
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// DQUOTE starts a new string
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case '"':
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this.currentNode = this.createNode(this.currentNode, this.pos + i);
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this.currentNode.type = 'string';
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this.state = STATE_STRING;
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this.currentNode.isClosed = false;
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break;
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// ( starts a new list
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case '(':
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this.currentNode = this.createNode(this.currentNode, this.pos + i);
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this.currentNode.type = 'LIST';
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this.currentNode.isClosed = false;
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break;
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// ) closes a list
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case ')':
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if (this.currentNode.type !== 'LIST') {
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let error = new Error(`Unexpected list terminator ) at position ${this.pos + i} [E10]`);
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error.code = 'ParserError10';
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error.parserContext = { input: this.str, pos: this.pos + i, chr };
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throw error;
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}
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this.currentNode.isClosed = true;
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this.currentNode.endPos = this.pos + i;
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this.currentNode = this.currentNode.parentNode;
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checkSP();
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break;
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// ] closes section group
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case ']':
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if (this.currentNode.type !== 'SECTION') {
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let error = new Error(`Unexpected section terminator ] at position ${this.pos + i} [E11]`);
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error.code = 'ParserError11';
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error.parserContext = { input: this.str, pos: this.pos + i, chr };
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throw error;
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}
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this.currentNode.isClosed = true;
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this.currentNode.endPos = this.pos + i;
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this.currentNode = this.currentNode.parentNode;
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checkSP();
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break;
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// < starts a new partial
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case '<':
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if (this.str.charAt(i - 1) !== ']') {
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this.currentNode = this.createNode(this.currentNode, this.pos + i);
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this.currentNode.type = 'ATOM';
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this.currentNode.value = chr;
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this.state = STATE_ATOM;
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} else {
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this.currentNode = this.createNode(this.currentNode, this.pos + i);
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this.currentNode.type = 'PARTIAL';
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this.state = STATE_PARTIAL;
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this.currentNode.isClosed = false;
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}
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break;
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// binary literal8
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case '~': {
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let nextChr = this.str.charAt(i + 1);
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if (nextChr !== '{') {
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if (imapFormalSyntax['ATOM-CHAR']().indexOf(nextChr) >= 0) {
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// treat as ATOM
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this.currentNode = this.createNode(this.currentNode, this.pos + i);
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this.currentNode.type = 'ATOM';
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this.currentNode.value = chr;
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this.state = STATE_ATOM;
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break;
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}
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let error = new Error(`Unexpected literal8 marker at position ${this.pos + i} [E12]`);
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error.code = 'ParserError12';
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error.parserContext = { input: this.str, pos: this.pos + i, chr };
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throw error;
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}
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this.expectedLiteralType = 'literal8';
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break;
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}
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// { starts a new literal
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case '{':
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this.currentNode = this.createNode(this.currentNode, this.pos + i);
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this.currentNode.type = 'LITERAL';
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this.currentNode.literalType = this.expectedLiteralType || 'literal';
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this.expectedLiteralType = false;
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this.state = STATE_LITERAL;
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this.currentNode.isClosed = false;
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break;
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// * starts a new sequence
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case '*':
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this.currentNode = this.createNode(this.currentNode, this.pos + i);
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this.currentNode.type = 'SEQUENCE';
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this.currentNode.value = chr;
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this.currentNode.isClosed = false;
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this.state = STATE_SEQUENCE;
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break;
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// normally a space should never occur
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case ' ':
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// just ignore
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break;
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// [ starts section
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case '[':
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// If it is the *first* element after response command, then process as a response argument list
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if (['OK', 'NO', 'BAD', 'BYE', 'PREAUTH'].includes(this.parent.command.toUpperCase()) && this.currentNode === this.tree) {
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this.currentNode.endPos = this.pos + i;
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this.currentNode = this.createNode(this.currentNode, this.pos + i);
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this.currentNode.type = 'ATOM';
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this.currentNode = this.createNode(this.currentNode, this.pos + i);
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this.currentNode.type = 'SECTION';
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this.currentNode.isClosed = false;
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this.state = STATE_NORMAL;
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// RFC2221 defines a response code REFERRAL whose payload is an
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// RFC2192/RFC5092 imapurl that we will try to parse as an ATOM but
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// fail quite badly at parsing. Since the imapurl is such a unique
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// (and crazy) term, we just specialize that case here.
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if (this.str.substr(i + 1, 9).toUpperCase() === 'REFERRAL ') {
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// create the REFERRAL atom
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this.currentNode = this.createNode(this.currentNode, this.pos + i + 1);
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this.currentNode.type = 'ATOM';
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this.currentNode.endPos = this.pos + i + 8;
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this.currentNode.value = 'REFERRAL';
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this.currentNode = this.currentNode.parentNode;
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// eat all the way through the ] to be the IMAPURL token.
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this.currentNode = this.createNode(this.currentNode, this.pos + i + 10);
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// just call this an ATOM, even though IMAPURL might be more correct
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this.currentNode.type = 'ATOM';
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// jump i to the ']'
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i = this.str.indexOf(']', i + 10);
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this.currentNode.endPos = this.pos + i - 1;
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this.currentNode.value = this.str.substring(this.currentNode.startPos - this.pos, this.currentNode.endPos - this.pos + 1);
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this.currentNode = this.currentNode.parentNode;
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// close out the SECTION
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this.currentNode.isClosed = true;
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this.currentNode = this.currentNode.parentNode;
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checkSP();
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}
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break;
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}
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/* falls through */
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default:
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// Any ATOM supported char starts a new Atom sequence, otherwise throw an error
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// Allow \ as the first char for atom to support system flags
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// Allow % to support LIST '' %
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// Allow 8bit characters (presumably unicode)
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if (imapFormalSyntax['ATOM-CHAR']().indexOf(chr) < 0 && chr !== '\\' && chr !== '%' && chr.charCodeAt(0) < 0x80) {
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let error = new Error(`Unexpected char at position ${this.pos + i} [E13: ${JSON.stringify(chr)}]`);
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error.code = 'ParserError13';
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error.parserContext = { input: this.str, pos: this.pos + i, chr };
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throw error;
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}
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this.currentNode = this.createNode(this.currentNode, this.pos + i);
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this.currentNode.type = 'ATOM';
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this.currentNode.value = chr;
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this.state = STATE_ATOM;
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break;
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}
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break;
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case STATE_ATOM:
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// space finishes an atom
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if (chr === ' ') {
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this.currentNode.endPos = this.pos + i - 1;
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this.currentNode = this.currentNode.parentNode;
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this.state = STATE_NORMAL;
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break;
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}
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//
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if (
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this.currentNode.parentNode &&
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((chr === ')' && this.currentNode.parentNode.type === 'LIST') || (chr === ']' && this.currentNode.parentNode.type === 'SECTION'))
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) {
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this.currentNode.endPos = this.pos + i - 1;
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this.currentNode = this.currentNode.parentNode;
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this.currentNode.isClosed = true;
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this.currentNode.endPos = this.pos + i;
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this.currentNode = this.currentNode.parentNode;
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this.state = STATE_NORMAL;
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checkSP();
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break;
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}
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if ((chr === ',' || chr === ':') && RE_DIGITS.test(this.currentNode.value)) {
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this.currentNode.type = 'SEQUENCE';
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this.currentNode.isClosed = true;
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this.state = STATE_SEQUENCE;
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}
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// [ starts a section group for this element
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if (chr === '[') {
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// allowed only for selected elements
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if (['BODY', 'BODY.PEEK', 'BINARY', 'BINARY.PEEK'].indexOf(this.currentNode.value.toUpperCase()) < 0) {
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if (/[./]/.test(this.currentNode.value)) {
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// could be a path
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this.currentNode.value += chr;
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break;
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} else {
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let error = new Error(`Unexpected section start char [ at position ${this.pos + i} [E14]`);
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error.code = 'ParserError14';
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error.parserContext = { input: this.str, pos: this.pos + i, chr };
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throw error;
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}
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}
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this.currentNode.endPos = this.pos + i;
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this.currentNode = this.createNode(this.currentNode.parentNode, this.pos + i);
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this.currentNode.type = 'SECTION';
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this.currentNode.isClosed = false;
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this.state = STATE_NORMAL;
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break;
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}
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if (chr === '<') {
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let error = new Error(`Unexpected start of partial at position ${this.pos + i} [E15]`);
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error.code = 'ParserError15';
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error.parserContext = { input: this.str, pos: this.pos + i, chr };
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throw error;
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}
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// if the char is not ATOM compatible, throw. Allow \* as an exception
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if (
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imapFormalSyntax['ATOM-CHAR']().indexOf(chr) < 0 &&
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chr.charCodeAt(0) < 0x80 && // allow 8bit (presumably unicode) bytes
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chr !== ']' &&
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!(chr === '*' && this.currentNode.value === '\\') &&
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(!this.parent || !this.parent.command || !['NO', 'BAD', 'OK'].includes(this.parent.command))
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) {
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let error = new Error(`Unexpected char at position ${this.pos + i} [E16: ${JSON.stringify(chr)}]`);
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error.code = 'ParserError16';
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error.parserContext = { input: this.str, pos: this.pos + i, chr };
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throw error;
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} else if (this.currentNode.value === '\\*') {
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let error = new Error(`Unexpected char at position ${this.pos + i} [E17: ${JSON.stringify(chr)}]`);
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error.code = 'ParserError17';
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error.parserContext = { input: this.str, pos: this.pos + i, chr };
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throw error;
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}
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this.currentNode.value += chr;
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break;
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case STATE_STRING:
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// DQUOTE ends the string sequence
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if (chr === '"') {
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this.currentNode.endPos = this.pos + i;
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this.currentNode.isClosed = true;
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this.currentNode = this.currentNode.parentNode;
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this.state = STATE_NORMAL;
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checkSP();
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break;
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}
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// \ Escapes the following char
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if (chr === '\\') {
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i++;
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if (i >= len) {
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let error = new Error(`Unexpected end of input at position ${this.pos + i} [E18]`);
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error.code = 'ParserError18';
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error.parserContext = { input: this.str, pos: this.pos + i };
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throw error;
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}
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chr = this.str.charAt(i);
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}
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this.currentNode.value += chr;
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break;
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case STATE_PARTIAL:
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if (chr === '>') {
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if (this.currentNode.value.at(-1) === '.') {
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let error = new Error(`Unexpected end of partial at position ${this.pos + i} [E19]`);
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error.code = 'ParserError19';
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error.parserContext = { input: this.str, pos: this.pos + i, chr };
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throw error;
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}
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this.currentNode.endPos = this.pos + i;
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this.currentNode.isClosed = true;
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this.currentNode = this.currentNode.parentNode;
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this.state = STATE_NORMAL;
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checkSP();
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break;
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}
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if (chr === '.' && (!this.currentNode.value.length || this.currentNode.value.match(/\./))) {
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let error = new Error(`Unexpected partial separator . at position ${this.pos + i} [E20]`);
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error.code = 'ParserError20';
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error.parserContext = { input: this.str, pos: this.pos + i, chr };
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throw error;
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}
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if (imapFormalSyntax.DIGIT().indexOf(chr) < 0 && chr !== '.') {
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let error = new Error(`Unexpected char at position ${this.pos + i} [E21: ${JSON.stringify(chr)}]`);
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error.code = 'ParserError21';
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error.parserContext = { input: this.str, pos: this.pos + i, chr };
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throw error;
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}
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if (this.currentNode.value.match(/^0$|\.0$/) && chr !== '.') {
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let error = new Error(`Invalid partial at position ${this.pos + i} [E22: ${JSON.stringify(chr)}]`);
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error.code = 'ParserError22';
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error.parserContext = { input: this.str, pos: this.pos + i, chr };
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throw error;
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}
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this.currentNode.value += chr;
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break;
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case STATE_LITERAL:
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if (this.currentNode.started) {
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// only relevant if literals are not already parsed out from input
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// Disabled NULL byte check
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// See https://github.com/emailjs/emailjs-imap-handler/commit/f11b2822bedabe492236e8263afc630134a3c41c
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/*
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if (chr === '\u0000') {
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throw new Error('Unexpected \\x00 at position ' + (this.pos + i));
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}
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*/
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this.currentNode.chBuffer[this.currentNode.chPos++] = chr.charCodeAt(0);
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if (this.currentNode.chPos >= this.currentNode.literalLength) {
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this.currentNode.endPos = this.pos + i;
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this.currentNode.isClosed = true;
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this.currentNode.value = this.currentNode.chBuffer.toString('binary');
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this.currentNode.chBuffer = Buffer.alloc(0);
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this.currentNode = this.currentNode.parentNode;
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this.state = STATE_NORMAL;
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checkSP();
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}
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break;
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}
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if (chr === '+' && this.options.literalPlus) {
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this.currentNode.literalPlus = true;
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break;
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}
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if (chr === '}') {
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if (!('literalLength' in this.currentNode)) {
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let error = new Error(`Unexpected literal prefix end char } at position ${this.pos + i} [E23]`);
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error.code = 'ParserError23';
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error.parserContext = { input: this.str, pos: this.pos + i, chr };
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throw error;
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}
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if (this.str.charAt(i + 1) === '\n') {
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i++;
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} else if (this.str.charAt(i + 1) === '\r' && this.str.charAt(i + 2) === '\n') {
|
|
i += 2;
|
|
} else {
|
|
let error = new Error(`Unexpected char at position ${this.pos + i} [E24: ${JSON.stringify(chr)}]`);
|
|
error.code = 'ParserError24';
|
|
error.parserContext = { input: this.str, pos: this.pos + i, chr };
|
|
throw error;
|
|
}
|
|
|
|
this.currentNode.literalLength = Number(this.currentNode.literalLength);
|
|
|
|
if (!this.currentNode.literalLength) {
|
|
// special case where literal content length is 0
|
|
// close the node right away, do not wait for additional input
|
|
this.currentNode.endPos = this.pos + i;
|
|
this.currentNode.isClosed = true;
|
|
this.currentNode = this.currentNode.parentNode;
|
|
this.state = STATE_NORMAL;
|
|
checkSP();
|
|
} else if (this.options.literals) {
|
|
// use the next precached literal values
|
|
this.currentNode.value = this.options.literals.shift();
|
|
|
|
// only APPEND arguments are kept as Buffers
|
|
/*
|
|
if ((this.parent.command || '').toString().toUpperCase() !== 'APPEND') {
|
|
this.currentNode.value = this.currentNode.value.toString('binary');
|
|
}
|
|
*/
|
|
|
|
this.currentNode.endPos = this.pos + i + this.currentNode.value.length;
|
|
|
|
this.currentNode.started = false;
|
|
this.currentNode.isClosed = true;
|
|
this.currentNode = this.currentNode.parentNode;
|
|
this.state = STATE_NORMAL;
|
|
checkSP();
|
|
} else {
|
|
this.currentNode.started = true;
|
|
// Allocate expected size buffer. Max size check is already performed
|
|
// Maybe should use allocUnsafe instead?
|
|
this.currentNode.chBuffer = Buffer.alloc(this.currentNode.literalLength);
|
|
this.currentNode.chPos = 0;
|
|
}
|
|
break;
|
|
}
|
|
if (imapFormalSyntax.DIGIT().indexOf(chr) < 0) {
|
|
let error = new Error(`Unexpected char at position ${this.pos + i} [E25: ${JSON.stringify(chr)}]`);
|
|
error.code = 'ParserError25';
|
|
error.parserContext = { input: this.str, pos: this.pos + i, chr };
|
|
throw error;
|
|
}
|
|
if (this.currentNode.literalLength === '0') {
|
|
let error = new Error(`Invalid literal at position ${this.pos + i} [E26]`);
|
|
error.code = 'ParserError26';
|
|
error.parserContext = { input: this.str, pos: this.pos + i, chr };
|
|
throw error;
|
|
}
|
|
this.currentNode.literalLength = (this.currentNode.literalLength || '') + chr;
|
|
break;
|
|
|
|
case STATE_SEQUENCE:
|
|
// space finishes the sequence set
|
|
if (chr === ' ') {
|
|
if (!RE_SINGLE_DIGIT.test(this.currentNode.value.at(-1)) && this.currentNode.value.at(-1) !== '*') {
|
|
let error = new Error(`Unexpected whitespace at position ${this.pos + i} [E27]`);
|
|
error.code = 'ParserError27';
|
|
error.parserContext = { input: this.str, pos: this.pos + i, chr };
|
|
throw error;
|
|
}
|
|
|
|
if (this.currentNode.value !== '*' && this.currentNode.value.at(-1) === '*' && this.currentNode.value.at(-2) !== ':') {
|
|
let error = new Error(`Unexpected whitespace at position ${this.pos + i} [E28]`);
|
|
error.code = 'ParserError28';
|
|
error.parserContext = { input: this.str, pos: this.pos + i, chr };
|
|
throw error;
|
|
}
|
|
|
|
this.currentNode.isClosed = true;
|
|
this.currentNode.endPos = this.pos + i - 1;
|
|
this.currentNode = this.currentNode.parentNode;
|
|
this.state = STATE_NORMAL;
|
|
break;
|
|
} else if (this.currentNode.parentNode && chr === ']' && this.currentNode.parentNode.type === 'SECTION') {
|
|
this.currentNode.endPos = this.pos + i - 1;
|
|
this.currentNode = this.currentNode.parentNode;
|
|
|
|
this.currentNode.isClosed = true;
|
|
this.currentNode.endPos = this.pos + i;
|
|
this.currentNode = this.currentNode.parentNode;
|
|
this.state = STATE_NORMAL;
|
|
|
|
checkSP();
|
|
break;
|
|
}
|
|
|
|
if (chr === ':') {
|
|
if (!RE_SINGLE_DIGIT.test(this.currentNode.value.at(-1)) && this.currentNode.value.at(-1) !== '*') {
|
|
let error = new Error(`Unexpected range separator : at position ${this.pos + i} [E29]`);
|
|
error.code = 'ParserError29';
|
|
error.parserContext = { input: this.str, pos: this.pos + i, chr };
|
|
throw error;
|
|
}
|
|
} else if (chr === '*') {
|
|
if ([',', ':'].indexOf(this.currentNode.value.at(-1)) < 0) {
|
|
let error = new Error(`Unexpected range wildcard at position ${this.pos + i} [E30]`);
|
|
error.code = 'ParserError30';
|
|
error.parserContext = { input: this.str, pos: this.pos + i, chr };
|
|
throw error;
|
|
}
|
|
} else if (chr === ',') {
|
|
if (!RE_SINGLE_DIGIT.test(this.currentNode.value.at(-1)) && this.currentNode.value.at(-1) !== '*') {
|
|
let error = new Error(`Unexpected sequence separator , at position ${this.pos + i} [E31]`);
|
|
error.code = 'ParserError31';
|
|
error.parserContext = { input: this.str, pos: this.pos + i, chr };
|
|
throw error;
|
|
}
|
|
if (this.currentNode.value.at(-1) === '*' && this.currentNode.value.at(-2) !== ':') {
|
|
let error = new Error(`Unexpected sequence separator , at position ${this.pos + i} [E32]`);
|
|
error.code = 'ParserError32';
|
|
error.parserContext = { input: this.str, pos: this.pos + i, chr };
|
|
throw error;
|
|
}
|
|
} else if (!RE_SINGLE_DIGIT.test(chr)) {
|
|
let error = new Error(`Unexpected char at position ${this.pos + i} [E33: ${JSON.stringify(chr)}]`);
|
|
error.code = 'ParserError33';
|
|
error.parserContext = { input: this.str, pos: this.pos + i, chr };
|
|
throw error;
|
|
}
|
|
|
|
if (RE_SINGLE_DIGIT.test(chr) && this.currentNode.value.at(-1) === '*') {
|
|
let error = new Error(`Unexpected number at position ${this.pos + i} [E34: ${JSON.stringify(chr)}]`);
|
|
error.code = 'ParserError34';
|
|
error.parserContext = { input: this.str, pos: this.pos + i, chr };
|
|
throw error;
|
|
}
|
|
|
|
this.currentNode.value += chr;
|
|
break;
|
|
|
|
case STATE_TEXT:
|
|
this.currentNode.value += chr;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
module.exports.TokenParser = TokenParser;
|