@monsterlee/fast-mhtml
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Parses mhtml files
622 lines (608 loc) • 26 kB
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<title>Code coverage report for parser.js</title>
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<h1><a href="index.html">All files</a> parser.js</h1>
<div class='clearfix'>
<div class='fl pad1y space-right2'>
<span class="strong">94.54% </span>
<span class="quiet">Statements</span>
<span class='fraction'>104/110</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">84.61% </span>
<span class="quiet">Branches</span>
<span class='fraction'>55/65</span>
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<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Functions</span>
<span class='fraction'>19/19</span>
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<div class='fl pad1y space-right2'>
<span class="strong">96.84% </span>
<span class="quiet">Lines</span>
<span class='fraction'>92/95</span>
</div>
</div>
<p class="quiet">
Press <em>n</em> or <em>j</em> to go to the next uncovered block, <em>b</em>, <em>p</em> or <em>k</em> for the previous block.
</p>
<template id="filterTemplate">
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Filter:
<input oninput="onInput()" type="search" id="fileSearch">
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<div class='status-line high'></div>
<pre><table class="coverage">
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">// eslint-disable-next-line import/no-unresolved
const filenamify = require('filenamify/browser');
const bodyDecoder = require('./decoder');
const linkReplacer = require('./link-replacer');
const CR = '\r'.charCodeAt(0);
const LF = '\n'.charCodeAt(0);
module.exports = class Parser {
constructor(config = {}) {
this.maxFileSize = config.maxFileSize || 50 * 1000 * 1000;
this.rewriteFn = config.rewriteFn || ((name) => filenamify(name));
this.gotString = false;
}
parse(file) { // file is contents
this.gotString = false;
<span class="missing-if-branch" title="else path not taken" >E</span>if (!Buffer.isBuffer(file)) {
file = Buffer.from(file);
this.gotString = true;
}
const endOfHeaders = Parser.findDoubleCrLf(file);
const header = file.slice(0, endOfHeaders).toString();
const separatorMatch = /boundary="(.*)"/g.exec(header);
if (!separatorMatch) {
throw new Error('No separator');
}
const separator = `--${separatorMatch[1]}`;
this.parts = Parser.splitByBoundary(file, separator, endOfHeaders + 1, this.maxFileSize)
.map(Parser.parsePart);
return this;
}
static splitByBoundary(file, separator, fromPosition, maxFileSize) {
let index;
const sepLen = separator.length;
const parts = [];
while ((index = file.indexOf(separator, fromPosition + 1)) !== -1) {
if (index - fromPosition > 12) { // push non empty parts added sometimes
if (index - fromPosition > maxFileSize) {
fromPosition = index;
continue; // ignore too big chunks
}
const part = file.slice(fromPosition + sepLen, index);
parts.push(part);
}
fromPosition = index;
}
return parts;
}
static findDoubleCrLf(file) {
for (let i = 0, len = file.length; i < len; i++) {
if (file[i] !== CR && file[i] !== LF) {
continue;
}
if (file[i] === CR && file[i + 1] === LF) {
// \r\n
if (file[i + 2] === CR && file[i + 3] === LF) {
return i;
}
continue;
}
if (file[i] === LF && file[i + 1] === LF) {
return i;
}
}
return -1;
}
rewrite() {
const replacerMap = {
'text/html': linkReplacer.html,
'text/css': linkReplacer.css,
'image/svg+xml': linkReplacer.svg,
};
const getReplacer = (type) => replacerMap[type] || ((body) => body);
const entries = this.parts
.filter((part) => part.location)
.map((part) => [part.location.trim(), part]);
const partMap = new Map();
/**
* some MHTML file may have same location with different id.
* generally leaning forward may be more important.
* so this action may ignore same location following.
*/
for (const [location, part] of entries) {
<span class="missing-if-branch" title="else path not taken" >E</span>if (!partMap.has(location)) partMap.set(location, part);
const id = `cid:${part.id}`;
if (part.id && !partMap.has(id)) partMap.set(id, part);
}
const rewriteMap = new Map();
const urlQueue = []; // record recursive rewrite url, void repeated rewrite
const proxyRewriteMap = new Proxy(rewriteMap, {
get: (target, property) => {
<span class="missing-if-branch" title="else path not taken" >E</span>if (property === 'get') {
return (key) => {
<span class="missing-if-branch" title="if path not taken" >I</span>if (!key) <span class="cstat-no" title="statement not covered" >return;</span>
<span class="missing-if-branch" title="if path not taken" >I</span>if (urlQueue.includes(key)) <span class="cstat-no" title="statement not covered" >return;</span>
const value = target.get(key);
if (value !== undefined) return value;
const part = partMap.get(key);
if (!part) return;
// console.log('key', key);
urlQueue.push(key);
const replacer = getReplacer(part.type);
part.body = replacer(part.body, proxyRewriteMap, part.location);
const url = this.rewriteFn(part.location, part);
part.rewriteLocation = url;
target.set(part.location, url);
const id = `cid:${part.id}`;
// use cid to reference resource
// eslint-disable-next-line max-len
if (key === id && part.location && target.get(part.location))target.set(part.location, url);
// use location to reference resource
else <span class="missing-if-branch" title="else path not taken" >E</span>if (key !== id) target.set(id, url);
urlQueue.pop();
return url;
};
}
const value = <span class="cstat-no" title="statement not covered" >target[property];</span>
<span class="cstat-no" title="statement not covered" > if (Object.prototype.toString.call(value) === '[object Function]') <span class="cstat-no" title="statement not covered" >return value.bind(target);</span></span>
<span class="cstat-no" title="statement not covered" > return value;</span>
}
});
for (const part of this.parts) {
proxyRewriteMap.get(part.location);
}
return this;
}
spit() {
return this.parts.map((part) => ({
filename: part.rewriteLocation,
content: this.gotString ? part.body.toString() : <span class="branch-1 cbranch-no" title="branch not covered" >part.body,</span>
type: part.type,
}));
}
static parsePart(part) {
const headerEnd = Parser.findDoubleCrLf(part);
const headerPart = part.slice(0, headerEnd).toString().trim();
let startBody = headerEnd + 1;
while ((part[startBody] === CR || part[startBody] === LF)
&& (startBody < headerEnd + 10)) { // remove some initial whitespace
startBody++;
}
const body = part.slice(startBody);
const headers = new Map(headerPart.split(/\r?\n/g)
.map((header) => header.split(': '))
.map(([key, value]) => [key.toLowerCase(), value]));
return {
location: headers.get('content-location'),
id: Parser.parseContentId(headers.get('content-id')),
type: headers.get('content-type'),
encoding: (headers.get('content-transfer-encoding') || <span class="branch-1 cbranch-no" title="branch not covered" >'')</span>.toLowerCase(),
body: Parser.parseBody(headers.get('content-transfer-encoding'), body),
};
}
static parseContentId(contentId) {
if (!contentId) {
return undefined;
}
return contentId.substring(1, contentId.length - 1);
}
static parseBody(encoding, body) {
return bodyDecoder(encoding, body);
}
};
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