40 lines
1.3 KiB
JavaScript
40 lines
1.3 KiB
JavaScript
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/*! formdata-polyfill. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
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const escape = (str, filename) =>
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(filename ? str : str.replace(/\r?\n|\r/g, '\r\n'))
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.replace(/\n/g, '%0A')
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.replace(/\r/g, '%0D')
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.replace(/"/g, '%22')
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/**
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* pure function to convert any formData instance to a Blob
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* instances synchronous without reading all of the files
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*
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* @param {FormData|*} formData an instance of a formData Class
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* @param {Blob|*} [BlobClass=Blob] the Blob class to use when constructing it
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*/
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export function formDataToBlob (formData, BlobClass = Blob) {
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const boundary = ('----formdata-polyfill-' + Math.random())
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const chunks = []
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const prefix = `--${boundary}\r\nContent-Disposition: form-data; name="`
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for (let [name, value] of formData) {
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if (typeof value === 'string') {
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chunks.push(prefix + escape(name) + `"\r\n\r\n${value.replace(/\r(?!\n)|(?<!\r)\n/g, '\r\n')}\r\n`)
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} else {
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chunks.push(
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prefix + escape(name) + `"; filename="${escape(value.name, 1)}"\r\n` +
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`Content-Type: ${value.type || 'application/octet-stream'}\r\n\r\n`,
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value,
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'\r\n'
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)
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}
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}
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chunks.push(`--${boundary}--`)
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return new BlobClass(chunks, {
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type: 'multipart/form-data; boundary=' + boundary
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})
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}
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