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chore: short-cut localUtils usage in JS client
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,4 @@ | ||
| [*] | ||
| ../utils/ | ||
| ../utilsBundle.ts | ||
| ../utilsBundle.ts | ||
| ../zipBundle.ts |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,175 @@ | ||
| /** | ||
| * Copyright (c) Microsoft Corporation. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the 'License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| import * as fs from 'fs'; | ||
| import * as path from 'path'; | ||
|
|
||
| import { createGuid } from '../utils/crypto'; | ||
| import { ZipFile } from '../utils/zipFile'; | ||
|
|
||
| import type { HeadersArray } from './types'; | ||
| import type * as har from '@trace/har'; | ||
|
|
||
| const redirectStatus = [301, 302, 303, 307, 308]; | ||
|
|
||
| export class HarBackend { | ||
| readonly id = createGuid(); | ||
| private _harFile: har.HARFile; | ||
| private _zipFile: ZipFile | null; | ||
| private _baseDir: string | null; | ||
|
|
||
| constructor(harFile: har.HARFile, baseDir: string | null, zipFile: ZipFile | null) { | ||
| this._harFile = harFile; | ||
| this._baseDir = baseDir; | ||
| this._zipFile = zipFile; | ||
| } | ||
|
|
||
| async lookup(url: string, method: string, headers: HeadersArray, postData: Buffer | undefined, isNavigationRequest: boolean): Promise<{ | ||
| action: 'error' | 'redirect' | 'fulfill' | 'noentry', | ||
| message?: string, | ||
| redirectURL?: string, | ||
| status?: number, | ||
| headers?: HeadersArray, | ||
| body?: Buffer }> { | ||
| let entry; | ||
| try { | ||
| entry = await this._harFindResponse(url, method, headers, postData); | ||
| } catch (e) { | ||
| return { action: 'error', message: 'HAR error: ' + e.message }; | ||
| } | ||
|
|
||
| if (!entry) | ||
| return { action: 'noentry' }; | ||
|
|
||
| // If navigation is being redirected, restart it with the final url to ensure the document's url changes. | ||
| if (entry.request.url !== url && isNavigationRequest) | ||
| return { action: 'redirect', redirectURL: entry.request.url }; | ||
|
|
||
| const response = entry.response; | ||
| try { | ||
| const buffer = await this._loadContent(response.content); | ||
| return { | ||
| action: 'fulfill', | ||
| status: response.status, | ||
| headers: response.headers, | ||
| body: buffer, | ||
| }; | ||
| } catch (e) { | ||
| return { action: 'error', message: e.message }; | ||
| } | ||
| } | ||
|
|
||
| private async _loadContent(content: { text?: string, encoding?: string, _file?: string }): Promise<Buffer> { | ||
| const file = content._file; | ||
| let buffer: Buffer; | ||
| if (file) { | ||
| if (this._zipFile) | ||
| buffer = await this._zipFile.read(file); | ||
| else | ||
| buffer = await fs.promises.readFile(path.resolve(this._baseDir!, file)); | ||
| } else { | ||
| buffer = Buffer.from(content.text || '', content.encoding === 'base64' ? 'base64' : 'utf-8'); | ||
| } | ||
| return buffer; | ||
| } | ||
|
|
||
| private async _harFindResponse(url: string, method: string, headers: HeadersArray, postData: Buffer | undefined): Promise<har.Entry | undefined> { | ||
| const harLog = this._harFile.log; | ||
| const visited = new Set<har.Entry>(); | ||
| while (true) { | ||
| const entries: har.Entry[] = []; | ||
| for (const candidate of harLog.entries) { | ||
| if (candidate.request.url !== url || candidate.request.method !== method) | ||
| continue; | ||
| if (method === 'POST' && postData && candidate.request.postData) { | ||
| const buffer = await this._loadContent(candidate.request.postData); | ||
| if (!buffer.equals(postData)) { | ||
| const boundary = multipartBoundary(headers); | ||
| if (!boundary) | ||
| continue; | ||
| const candidataBoundary = multipartBoundary(candidate.request.headers); | ||
| if (!candidataBoundary) | ||
| continue; | ||
| // Try to match multipart/form-data ignroing boundary as it changes between requests. | ||
| if (postData.toString().replaceAll(boundary, '') !== buffer.toString().replaceAll(candidataBoundary, '')) | ||
| continue; | ||
| } | ||
| } | ||
| entries.push(candidate); | ||
| } | ||
|
|
||
| if (!entries.length) | ||
| return; | ||
|
|
||
| let entry = entries[0]; | ||
|
|
||
| // Disambiguate using headers - then one with most matching headers wins. | ||
| if (entries.length > 1) { | ||
| const list: { candidate: har.Entry, matchingHeaders: number }[] = []; | ||
| for (const candidate of entries) { | ||
| const matchingHeaders = countMatchingHeaders(candidate.request.headers, headers); | ||
| list.push({ candidate, matchingHeaders }); | ||
| } | ||
| list.sort((a, b) => b.matchingHeaders - a.matchingHeaders); | ||
| entry = list[0].candidate; | ||
| } | ||
|
|
||
| if (visited.has(entry)) | ||
| throw new Error(`Found redirect cycle for ${url}`); | ||
|
|
||
| visited.add(entry); | ||
|
|
||
| // Follow redirects. | ||
| const locationHeader = entry.response.headers.find(h => h.name.toLowerCase() === 'location'); | ||
| if (redirectStatus.includes(entry.response.status) && locationHeader) { | ||
| const locationURL = new URL(locationHeader.value, url); | ||
| url = locationURL.toString(); | ||
| if ((entry.response.status === 301 || entry.response.status === 302) && method === 'POST' || | ||
| entry.response.status === 303 && !['GET', 'HEAD'].includes(method)) { | ||
| // HTTP-redirect fetch step 13 (https://fetch.spec.whatwg.org/#http-redirect-fetch) | ||
| method = 'GET'; | ||
| } | ||
| continue; | ||
| } | ||
|
|
||
| return entry; | ||
| } | ||
| } | ||
|
|
||
| dispose() { | ||
| this._zipFile?.close(); | ||
| } | ||
| } | ||
|
|
||
| function countMatchingHeaders(harHeaders: har.Header[], headers: HeadersArray): number { | ||
| const set = new Set(headers.map(h => h.name.toLowerCase() + ':' + h.value)); | ||
| let matches = 0; | ||
| for (const h of harHeaders) { | ||
| if (set.has(h.name.toLowerCase() + ':' + h.value)) | ||
| ++matches; | ||
| } | ||
| return matches; | ||
| } | ||
|
|
||
| function multipartBoundary(headers: HeadersArray) { | ||
| const contentType = headers.find(h => h.name.toLowerCase() === 'content-type'); | ||
| if (!contentType?.value.includes('multipart/form-data')) | ||
| return undefined; | ||
| const boundary = contentType.value.match(/boundary=(\S+)/); | ||
| if (boundary) | ||
| return boundary[1]; | ||
| return undefined; | ||
| } |
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