/
image-cdn-url-generator.ts
60 lines (50 loc) · 1.39 KB
/
image-cdn-url-generator.ts
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import type {
ImageCdnUrlGeneratorFn,
ImageCdnSourceImage,
ImageCdnTransformArgs,
} from "gatsby"
export const generateImageUrl: ImageCdnUrlGeneratorFn =
function generateImageUrl(
source: ImageCdnSourceImage,
imageArgs: ImageCdnTransformArgs
): string {
const placeholderOrigin = `http://netlify.com`
const imageParams = generateImageArgs(imageArgs)
const baseURL = new URL(`${placeholderOrigin}/.netlify/images`)
baseURL.search = imageParams.toString()
baseURL.searchParams.append(`url`, source.url)
baseURL.searchParams.append(`cd`, source.internal.contentDigest)
return `${baseURL.pathname}${baseURL.search}`
}
export function generateImageArgs({
width,
height,
format,
cropFocus,
quality,
}: ImageCdnTransformArgs): URLSearchParams {
const params = new URLSearchParams()
if (width) {
params.append(`w`, width.toString())
}
if (height) {
params.append(`h`, height.toString())
}
if (cropFocus) {
params.append(`fit`, `cover`)
if (Array.isArray(cropFocus)) {
// For array of cropFocus values, append them as comma-separated string
params.append(`position`, cropFocus.join(`,`))
} else {
params.append(`position`, cropFocus)
}
}
if (format) {
params.append(`fm`, format)
}
if (quality) {
params.append(`q`, quality.toString())
}
return params
}
export default generateImageUrl