Elijah
724d70e58b
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51 lines
1.8 KiB
JavaScript
51 lines
1.8 KiB
JavaScript
import isReactNative from './isReactNative.js'
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import uriToBlob from './uriToBlob.js'
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import FileSource from './sources/FileSource.js'
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import StreamSource from './sources/StreamSource.js'
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export default class FileReader {
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async openFile(input, chunkSize) {
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// In React Native, when user selects a file, instead of a File or Blob,
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// you usually get a file object {} with a uri property that contains
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// a local path to the file. We use XMLHttpRequest to fetch
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// the file blob, before uploading with tus.
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if (isReactNative() && input && typeof input.uri !== 'undefined') {
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try {
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const blob = await uriToBlob(input.uri)
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return new FileSource(blob)
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} catch (err) {
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throw new Error(
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`tus: cannot fetch \`file.uri\` as Blob, make sure the uri is correct and accessible. ${err}`,
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)
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}
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}
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// Since we emulate the Blob type in our tests (not all target browsers
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// support it), we cannot use `instanceof` for testing whether the input value
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// can be handled. Instead, we simply check is the slice() function and the
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// size property are available.
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if (typeof input.slice === 'function' && typeof input.size !== 'undefined') {
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return Promise.resolve(new FileSource(input))
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}
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if (typeof input.read === 'function') {
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chunkSize = Number(chunkSize)
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if (!Number.isFinite(chunkSize)) {
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return Promise.reject(
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new Error(
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'cannot create source for stream without a finite value for the `chunkSize` option',
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),
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)
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}
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return Promise.resolve(new StreamSource(input, chunkSize))
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}
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return Promise.reject(
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new Error(
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'source object may only be an instance of File, Blob, or Reader in this environment',
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),
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)
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}
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}
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