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* Generator function to stream text from response.
*
* @param {Response} response - response from fetch
* @yields {string} text from the response stream.
*/
export async function * toTextStream (response) {
const { body } = response
if (!body) {
return
}
const reader = body.getReader()
const decoder = new TextDecoder()
while (true) {
// wait for next encoded chunk
const { done, value } = await reader.read()
// check if stream is done
if (done) { break }
// Decodes data chunk and yields it
yield (decoder.decode(value))
}
}
/**
* Gets parsed LinkHeader. Returns empty LinkHeader if invalid or absent
* @param {Response|string} responseOrHeader - response from fetch
* @returns {LinkHeader} parser Link header
*/
export function linkHeaderOf (responseOrHeader) {
if (responseOrHeader instanceof Response) {
const header = responseOrHeader.headers.get('Link')
return parseLinkHttpHeader(header)
}
if (typeof responseOrHeader === 'string') {
return parseLinkHttpHeader(responseOrHeader)
}
return parseLinkHttpHeader(null)
}
/**
* Parses "X-Has-More" as well as "Has-More" header from response to
* detect if there is more data to fetch
* Note: "Has-More" has higher priority than "X-Has-More"
* @param {Response} response - response from fetch
* @returns {boolean} parsed "Has more" response header
*/
export function parseHasMoreHeader (response) {
if (!(response instanceof Response)) {
return false
}
for (const headerName of ['Has-More', 'X-Has-More']) {
const header = response.headers.get(headerName)
if (header) {
return header.toLowerCase() === 'true'
}
}
return false
}
/**
* Parses Link HTTP header used for pagination only
* @param {string?} header - response from fetch
* @returns {LinkHeader} parser Link header
*/
function parseLinkHttpHeader (header) {
if (!header || header.length <= 0) {
return { entries: [], byRel: {} }
}
const entries = Iterator.from(splitLinkEntries(header))
.map(parseLinkHeaderEntry)
.filter(result => result != null)
.toArray()
const byRel = /** @type {LinkHeader["byRel"]} */({})
for (const entry of entries) {
const { params: { rel } } = entry
if (!rel) { continue }
for (const relEntry of rel.split(' ').filter(Boolean)) {
byRel[relEntry] ??= []
byRel[relEntry].push(entry)
}
}
return { entries, byRel }
}
/**
* @param {string} header - header object
*/
function splitLinkEntries (header) {
const entries = []
let subEntry = []
let current = ''
let inQuotes = false
let inAngleBrackets = false
let firstAngleBrackets = true
for (let i = 0, e = header.length; i < e; i++) {
const char = header[i]
if ((inAngleBrackets && char !== '>') || (inQuotes && char !== '"')) {
current += char
continue
}
if (char === '<' && firstAngleBrackets) {
inAngleBrackets = true
firstAngleBrackets = false
}
if (char === '>') {
inAngleBrackets = false
}
if (char === '"') {
inQuotes = !inQuotes
}
if (char === ';') {
subEntry.push(current)
current = ''
continue
}
if (char === ',') {
subEntry.push(current)
entries.push(subEntry)
current = ''
subEntry = []
firstAngleBrackets = true
} else {
current += char
}
}
if (current) {
subEntry.push(current)
entries.push(subEntry)
}
return entries
}
/**
* @param {string[]} headerEntry - `Link` header entry
* @returns {LinkHeaderEntry|null} parser header entry, or null if invalid
*/
function parseLinkHeaderEntry (headerEntry) {
const [uri, ...params] = headerEntry
const match = uri.match(/<([^>]+)>/)
if (!match) { return null }
const url = match[1]
const parsedParams = Object.fromEntries(
Iterator.from(params)
.map(p => p.trim())
.filter(Boolean)
.map(param => param.match(/^([^=]+)="?([^"]+)"?$/))
.filter(match => match != null)
.map(match => {
const [,key, value] = match
return [key, value]
})
.toArray(),
)
return { url, params: parsedParams }
}
/**
* @typedef {object} LinkHeader
*
* @property {LinkHeaderEntry[]} entries - link entries
* @property {{[rel: string]: LinkHeaderEntry[]}} byRel - link entries grouped by rel
*/
/**
* @typedef {object} LinkHeaderEntry
*
* @property {string} url - link entry URI
* @property {{[key: string]: string}} params - link entry parameters
*/
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