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import { nextFontError } from '../next-font-error'
import { fetchResource } from './fetch-resource'
import { retry } from './retry'
/**
* Fetches the CSS containing the @font-face declarations from Google Fonts.
* The fetch has a user agent header with a modern browser to ensure we'll get .woff2 files.
*
* The env variable NEXT_FONT_GOOGLE_MOCKED_RESPONSES may be set containing a path to mocked data.
* It's used to define mocked data to avoid hitting the Google Fonts API during tests.
*/
export async function fetchCSSFromGoogleFonts(
url: string,
fontFamily: string,
isDev: boolean
): Promise<string> {
if (process.env.NEXT_FONT_GOOGLE_MOCKED_RESPONSES) {
const mockFile = require(process.env.NEXT_FONT_GOOGLE_MOCKED_RESPONSES)
const mockedResponse = mockFile[url]
if (!mockedResponse) {
nextFontError('Missing mocked response for URL: ' + url)
}
return mockedResponse
}
const buffer = await retry(async () => {
return fetchResource(
url,
isDev,
`Failed to fetch font \`${fontFamily}\`: ${url}\n` +
`Please check your network connection.`
)
}, 3)
return buffer.toString('utf8')
}
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