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shared.js
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shared.js
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const Stream = require('stream')
function serializeHeaders (headers) {
return headers.raw()
}
function deserializeHeaders (fetch, old = {}) {
const headers = new fetch.Headers()
for (const name in old) {
for (const value of old[name]) {
headers.append(name, value)
}
}
return headers
}
function serializeRequest (request) {
return [
request.url,
{
method: request.method,
headers: request.headers,
body: request.body,
mode: request.mode,
credentials: request.credentials,
cache: request.cache,
redirect: request.redirect,
referrer: request.referrer,
referrerPolicy: request.referrerPolicy,
integrity: request.integrity,
keepalive: request.keepalive,
// signal: request.signal,
// node-fetch props
follow: request.follow,
timeout: request.timeout,
compress: request.compress,
size: request.size
// agent: request.agent
}
]
}
function deserializeRequest (fetch, resource, init) {
return new fetch.Request(resource, {
...init,
body: init.body ? Buffer.from(init.body, 'base64') : undefined,
headers: deserializeHeaders(fetch, init.headers)
})
}
function serializeResponse (response) {
return {
url: response.url,
headers: response.headers.raw(),
status: response.status,
statusText: response.statusText,
counter: response.redirected ? 1 : 0 // could be more than one, but no way of telling
}
}
function deserializeResponse (fetch, body, init, bodyError) {
const buffer = Buffer.from(body, 'base64')
return new fetch.Response(
body ? createStream(buffer) : createStream(null),
{
...init,
headers: deserializeHeaders(fetch, init.headers)
},
{
buffer,
bodyError
}
)
}
const errors = {
TypeError
}
function serializeError ({ constructor, message, type, code }) {
return [
constructor.name,
[message, type, { code }]
]
}
function deserializeError (fetch, name, init) {
if (name in errors) {
return new errors[name](...init)
} else {
return new fetch.FetchError(...init)
}
}
function parseBodyType (body) {
if (body == null) {
return 'Null'
} else if (body.constructor.name === 'URLSearchParams') {
return 'URLSearchParams'
} else if (Buffer.isBuffer(body)) {
return 'Buffer'
} else if (Object.prototype.toString.call(body) === '[object ArrayBuffer]') {
return 'ArrayBuffer'
} else if (ArrayBuffer.isView(body)) {
return 'ArrayBufferView'
} else if (body instanceof Stream) {
return 'Stream'
} else {
return 'String'
}
}
function parseBody (body, type = parseBodyType(body)) {
switch (type) {
case 'Null': return null
case 'URLSearchParams': return Buffer.from(body.toString())
case 'Buffer': return body
case 'ArrayBuffer': return Buffer.from(body)
case 'ArrayBufferView': return Buffer.from(body.buffer, body.byteOffset, body.byteLength)
case 'String': return Buffer.from(String(body))
default: throw new TypeError(`sync-fetch does not support bodies of type: ${type}`)
}
}
function createStream (buffer) {
return new Stream.Transform({
read () {
this.push(buffer)
this.push(null)
}
})
}
module.exports = {
serializeHeaders,
deserializeHeaders,
serializeRequest,
deserializeRequest,
serializeResponse,
deserializeResponse,
serializeError,
deserializeError,
parseBodyType,
parseBody,
createStream
}