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Fetch multiple urls with fetch and save multiple response data
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| const RAW_CONTENT_TYPES = ['image/svg+xml'] | |
| /** | |
| * Fetch url | |
| * | |
| * @param {string} url | |
| */ | |
| export const fetchResources = url => fetch(url, { | |
| credentials: 'same-origin', | |
| }).then((response) => { | |
| if (!response.ok) { | |
| throw new Error(`Could load resource from ${url}: ${response.statusText}`) | |
| } | |
| return response | |
| }) | |
| .then((response) => { | |
| const contentType = response.headers.get('Content-Type') | |
| const responseClone = response.clone() | |
| const promises = [] | |
| promises.push(response.url) | |
| promises.push(contentType) | |
| promises.push(response.arrayBuffer()) | |
| if (RAW_CONTENT_TYPES.includes(contentType)) { | |
| promises.push(responseClone.text()) | |
| } | |
| return Promise.all(promises) | |
| }) | |
| /** | |
| * Build object with response data | |
| * | |
| * @param {Array<Array>} responses array of responses | |
| */ | |
| const buildContentResponse = responses => responses.reduce((acc, response) => { | |
| let data = { | |
| url: response[0], | |
| contentType: response[1], | |
| content: response[2], | |
| } | |
| if (response[3]) { | |
| data = { | |
| ...data, | |
| rawString: response[3], | |
| } | |
| } | |
| return [...acc, { ...data }] | |
| }, []) | |
| /** | |
| * Load external resources | |
| * | |
| * @param {Array} externalResources array of urls | |
| */ | |
| export const fetchExternalResources = externalResources => | |
| Promise.all(externalResources.map(url => fetchResources(url))) | |
| .then(responses => buildContentResponse(responses)) |
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