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https://gitee.com/onvia/ccc-tnt-psd2ui
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101 lines
2.6 KiB
JavaScript
101 lines
2.6 KiB
JavaScript
import { statSync, createReadStream, promises as fs } from 'node:fs'
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import { basename } from 'node:path'
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import DOMException from 'node-domexception'
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import File from './file.js'
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import Blob from './index.js'
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const { stat } = fs
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/**
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* @param {string} path filepath on the disk
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* @param {string} [type] mimetype to use
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*/
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const blobFromSync = (path, type) => fromBlob(statSync(path), path, type)
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/**
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* @param {string} path filepath on the disk
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* @param {string} [type] mimetype to use
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* @returns {Promise<Blob>}
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*/
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const blobFrom = (path, type) => stat(path).then(stat => fromBlob(stat, path, type))
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/**
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* @param {string} path filepath on the disk
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* @param {string} [type] mimetype to use
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* @returns {Promise<File>}
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*/
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const fileFrom = (path, type) => stat(path).then(stat => fromFile(stat, path, type))
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/**
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* @param {string} path filepath on the disk
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* @param {string} [type] mimetype to use
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*/
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const fileFromSync = (path, type) => fromFile(statSync(path), path, type)
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// @ts-ignore
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const fromBlob = (stat, path, type = '') => new Blob([new BlobDataItem({
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path,
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size: stat.size,
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lastModified: stat.mtimeMs,
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start: 0
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})], { type })
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// @ts-ignore
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const fromFile = (stat, path, type = '') => new File([new BlobDataItem({
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path,
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size: stat.size,
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lastModified: stat.mtimeMs,
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start: 0
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})], basename(path), { type, lastModified: stat.mtimeMs })
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/**
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* This is a blob backed up by a file on the disk
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* with minium requirement. Its wrapped around a Blob as a blobPart
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* so you have no direct access to this.
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*
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* @private
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*/
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class BlobDataItem {
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#path
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#start
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constructor (options) {
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this.#path = options.path
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this.#start = options.start
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this.size = options.size
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this.lastModified = options.lastModified
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}
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/**
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* Slicing arguments is first validated and formatted
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* to not be out of range by Blob.prototype.slice
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*/
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slice (start, end) {
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return new BlobDataItem({
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path: this.#path,
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lastModified: this.lastModified,
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size: end - start,
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start: this.#start + start
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})
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}
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async * stream () {
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const { mtimeMs } = await stat(this.#path)
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if (mtimeMs > this.lastModified) {
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throw new DOMException('The requested file could not be read, typically due to permission problems that have occurred after a reference to a file was acquired.', 'NotReadableError')
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}
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yield * createReadStream(this.#path, {
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start: this.#start,
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end: this.#start + this.size - 1
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})
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}
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get [Symbol.toStringTag] () {
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return 'Blob'
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}
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}
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export default blobFromSync
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export { File, Blob, blobFrom, blobFromSync, fileFrom, fileFromSync }
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