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The `Blob` object is an immutable data buffer. This is a first step towards alignment with the `Blob` Web API. Signed-off-by: James M Snell <[email protected]> PR-URL: #36811 Backport-PR-URL: #39704 Reviewed-By: Antoine du Hamel <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Benjamin Gruenbaum <[email protected]>
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Original file line number | Diff line number | Diff line change |
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'use strict'; | ||
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const { | ||
ArrayFrom, | ||
ObjectSetPrototypeOf, | ||
Promise, | ||
PromiseResolve, | ||
RegExpPrototypeTest, | ||
StringPrototypeToLowerCase, | ||
Symbol, | ||
SymbolIterator, | ||
Uint8Array, | ||
} = primordials; | ||
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const { | ||
createBlob, | ||
FixedSizeBlobCopyJob, | ||
} = internalBinding('buffer'); | ||
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const { TextDecoder } = require('internal/encoding'); | ||
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const { | ||
JSTransferable, | ||
kClone, | ||
kDeserialize, | ||
} = require('internal/worker/js_transferable'); | ||
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const { | ||
isAnyArrayBuffer, | ||
isArrayBufferView, | ||
} = require('internal/util/types'); | ||
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const { | ||
customInspectSymbol: kInspect, | ||
emitExperimentalWarning, | ||
} = require('internal/util'); | ||
const { inspect } = require('internal/util/inspect'); | ||
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const { | ||
AbortError, | ||
codes: { | ||
ERR_INVALID_ARG_TYPE, | ||
ERR_BUFFER_TOO_LARGE, | ||
ERR_OUT_OF_RANGE, | ||
} | ||
} = require('internal/errors'); | ||
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const { | ||
validateObject, | ||
validateString, | ||
validateUint32, | ||
isUint32, | ||
} = require('internal/validators'); | ||
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const kHandle = Symbol('kHandle'); | ||
const kType = Symbol('kType'); | ||
const kLength = Symbol('kLength'); | ||
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let Buffer; | ||
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function deferred() { | ||
let res, rej; | ||
const promise = new Promise((resolve, reject) => { | ||
res = resolve; | ||
rej = reject; | ||
}); | ||
return { promise, resolve: res, reject: rej }; | ||
} | ||
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function lazyBuffer() { | ||
if (Buffer === undefined) | ||
Buffer = require('buffer').Buffer; | ||
return Buffer; | ||
} | ||
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function isBlob(object) { | ||
return object?.[kHandle] !== undefined; | ||
} | ||
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function getSource(source, encoding) { | ||
if (isBlob(source)) | ||
return [source.size, source[kHandle]]; | ||
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if (typeof source === 'string') { | ||
source = lazyBuffer().from(source, encoding); | ||
} else if (isAnyArrayBuffer(source)) { | ||
source = new Uint8Array(source); | ||
} else if (!isArrayBufferView(source)) { | ||
throw new ERR_INVALID_ARG_TYPE( | ||
'source', | ||
[ | ||
'string', | ||
'ArrayBuffer', | ||
'SharedArrayBuffer', | ||
'Buffer', | ||
'TypedArray', | ||
'DataView' | ||
], | ||
source); | ||
} | ||
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// We copy into a new Uint8Array because the underlying | ||
// BackingStores are going to be detached and owned by | ||
// the Blob. We also don't want to have to worry about | ||
// byte offsets. | ||
source = new Uint8Array(source); | ||
return [source.byteLength, source]; | ||
} | ||
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class InternalBlob extends JSTransferable { | ||
constructor(handle, length, type = '') { | ||
super(); | ||
this[kHandle] = handle; | ||
this[kType] = type; | ||
this[kLength] = length; | ||
} | ||
} | ||
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class Blob extends JSTransferable { | ||
constructor(sources = [], options) { | ||
emitExperimentalWarning('buffer.Blob'); | ||
if (sources === null || | ||
typeof sources[SymbolIterator] !== 'function' || | ||
typeof sources === 'string') { | ||
throw new ERR_INVALID_ARG_TYPE('sources', 'Iterable', sources); | ||
} | ||
if (options !== undefined) | ||
validateObject(options, 'options'); | ||
const { | ||
encoding = 'utf8', | ||
type = '', | ||
} = { ...options }; | ||
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let length = 0; | ||
const sources_ = ArrayFrom(sources, (source) => { | ||
const { 0: len, 1: src } = getSource(source, encoding); | ||
length += len; | ||
return src; | ||
}); | ||
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// This is a MIME media type but we're not actively checking the syntax. | ||
// But, to be fair, neither does Chrome. | ||
validateString(type, 'options.type'); | ||
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if (!isUint32(length)) | ||
throw new ERR_BUFFER_TOO_LARGE(0xFFFFFFFF); | ||
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super(); | ||
this[kHandle] = createBlob(sources_, length); | ||
this[kLength] = length; | ||
this[kType] = RegExpPrototypeTest(/[^\u{0020}-\u{007E}]/u, type) ? | ||
'' : StringPrototypeToLowerCase(type); | ||
} | ||
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[kInspect](depth, options) { | ||
if (depth < 0) | ||
return this; | ||
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const opts = { | ||
...options, | ||
depth: options.depth == null ? null : options.depth - 1 | ||
}; | ||
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return `Blob ${inspect({ | ||
size: this.size, | ||
type: this.type, | ||
}, opts)}`; | ||
} | ||
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[kClone]() { | ||
const handle = this[kHandle]; | ||
const type = this[kType]; | ||
const length = this[kLength]; | ||
return { | ||
data: { handle, type, length }, | ||
deserializeInfo: 'internal/blob:InternalBlob' | ||
}; | ||
} | ||
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[kDeserialize]({ handle, type, length }) { | ||
this[kHandle] = handle; | ||
this[kType] = type; | ||
this[kLength] = length; | ||
} | ||
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get type() { return this[kType]; } | ||
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get size() { return this[kLength]; } | ||
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slice(start = 0, end = (this[kLength]), type = this[kType]) { | ||
validateUint32(start, 'start'); | ||
if (end < 0) end = this[kLength] + end; | ||
validateUint32(end, 'end'); | ||
validateString(type, 'type'); | ||
if (end < start) | ||
throw new ERR_OUT_OF_RANGE('end', 'greater than start', end); | ||
if (end > this[kLength]) | ||
throw new ERR_OUT_OF_RANGE('end', 'less than or equal to length', end); | ||
return new InternalBlob( | ||
this[kHandle].slice(start, end), | ||
end - start, type); | ||
} | ||
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async arrayBuffer() { | ||
const job = new FixedSizeBlobCopyJob(this[kHandle]); | ||
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const ret = job.run(); | ||
if (ret !== undefined) | ||
return PromiseResolve(ret); | ||
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const { | ||
promise, | ||
resolve, | ||
reject | ||
} = deferred(); | ||
job.ondone = (err, ab) => { | ||
if (err !== undefined) | ||
return reject(new AbortError()); | ||
resolve(ab); | ||
}; | ||
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return promise; | ||
} | ||
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async text() { | ||
const dec = new TextDecoder(); | ||
return dec.decode(await this.arrayBuffer()); | ||
} | ||
} | ||
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InternalBlob.prototype.constructor = Blob; | ||
ObjectSetPrototypeOf( | ||
InternalBlob.prototype, | ||
Blob.prototype); | ||
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module.exports = { | ||
Blob, | ||
InternalBlob, | ||
isBlob, | ||
}; |
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