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| import fetch from 'isomorphic-fetch'
import isObject from 'lodash.isobject'
import {createAction} from 'redux-actions'
export const INCREMENT_FETCH = 'increment outstanding fetches'
export const DECREMENT_FETCH = 'decrement outstanding fetches'
export const FETCH = 'fetch'
export const FETCH_MULTIPLE = 'fetch multiple'
export const FETCH_ERROR = 'fetch error'
export const incrementFetches = createAction(INCREMENT_FETCH)
export const decrementFetches = createAction(DECREMENT_FETCH)
export const fetchAction = createAction(FETCH)
export const fetchMultiple = createAction(FETCH_MULTIPLE)
export const fetchError = createAction(FETCH_ERROR)
export function middleware (store) {
return (next) => (action) => {
if (action.type === FETCH) {
return store.dispatch(runFetchAction(action.payload, store.getState()))
} else if (action.type === FETCH_MULTIPLE) {
return store.dispatch(runFetchMultiple(action.payload, store.getState()))
} else {
return next(action)
}
}
}
export default fetchAction
/**
* Calls fetch, adds Auth and Content header if needed. Automatically parses content based on type.
*
* @returns Promise
*/
function runFetch ({
options = {},
retry = false,
url
}, state) {
const isJSON = isObject(options.body)
return fetch(url, {
...options,
body: isJSON ? JSON.stringify(options.body) : options.body,
headers: {
...createAuthorizationHeader(state),
...createContentHeader(isJSON),
...(options.headers || {})
}
})
.then(checkStatus)
.then(createResponse)
.then(async (response) =>
(retry && await retry(response))E
? runFetch({options, retry, url}, state)
: response)
}
function runFetchAction ({
next,
options = {},
retry = false,
url
}, state) {
return [
incrementFetches(),
runFetch({options, retry, url}, state)
.then((response) => [decrementFetches(), next(null, response)])
.catch((error) =>
createErrorResponse(error)
.then((response) => [decrementFetches(), fetchError(response), next(error, response)]))
]
}
/**
* @returns Promise
*/
function runFetchMultiple ({
fetches,
next
}, state) {
return [
incrementFetches(),
Promise.all(fetches.map((fetch) => runFetch(fetch, state)))
.then((responses) => [decrementFetches(), next(null, responses)])
.catch((error) =>
createErrorResponse(error)
.then((response) => [decrementFetches(), fetchError(response), next(error, response)]))
]
}
function createAuthorizationHeader (state) {
return state.user && state.user.idToken
? {Authorization: `bearer ${state.user.idToken}`}
: {}
}
function checkStatus (res) {
Eif (res.status >= 200 && res.status < 300) {
return res
} else {
throw res
}
}
function createContentHeader (isJSON) {
return isJSON
? {'Accept': 'application/json', 'Content-Type': 'application/json;charset=UTF-8'}
: {}
}
function createErrorResponse (res) {
return res.headers
? createResponse(res)
: Promise.resolve(res)
}
function createResponse (res) {
return deserialize(res)
.then((value) => ({
url: res.url,
status: res.status,
statusText: res.statusText,
headers: res.headers,
value
}))
.catch((err) => ({
value: err
}))
}
function deserialize (res) {
const header = `${res.headers.get('Content-Type')} ${res.headers.get('Content')}`
if (header.indexOf('application/json') > -1) return res.json()
Iif (header.indexOf('application/ld+json') > -1) return res.json()
Iif (header.indexOf('application/octet-stream') > -1) return res.arrayBuffer()
return res.text()
}
|