Unicode characters not encoded in preview redirection URL

[sylvaingi]

Versions

• @prismicio/next: 0.1.9
• next: 12.3.4
• node: 16.18.1

Reproduction

1. Setup a document type page, with an uid field and the following route resolver:

  {
    type: 'page',
    path: '/:uid',
  }

2. Preview a page document with an uid containing unicode characters, like тест.

What is expected?

The тест page document is previewed.

What is actually happening?

An error page is displayed, and Next.js logs the following error:

TypeError [ERR_INVALID_CHAR]: Invalid character in header content ["Location"]
    at ServerResponse.setHeader (node:_http_outgoing:647:3)
    at ServerResponse._res.setHeader ([REDACTED]/node_modules/next/dist/server/base-server.js:127:24)
    at setHeadersFromObject ([REDACTED]/node_modules/next/dist/compiled/compression/index.js:46:680)
    at ServerResponse.setWriteHeadHeaders ([REDACTED]/node_modules/next/dist/compiled/compression/index.js:46:914)
    at ServerResponse.writeHead ([REDACTED]/node_modules/next/dist/compiled/compression/index.js:46:121)
    at Object.redirect ([REDACTED]/node_modules/next/dist/server/api-utils/index.js:35:9)
    at ServerResponse.apiRes.redirect ([REDACTED]/node_modules/next/dist/server/api-utils/node.js:351:59)
    at redirectToPreviewURL (webpack-internal:///(api)/../node_modules/@prismicio/next/dist/redirectToPreviewURL.js:18:16)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at async preview (webpack-internal:///(api)/./src/pages/api/preview.ts:30:9) {
  code: 'ERR_INVALID_CHAR',
  page: '/api/preview'
}

After some research the error is located within redirectToPreviewURL, with the underlying res.redirect call. This function tries to send a response with the Location header set with the redirection URL, but it seems that Node doesn't allow raw unicode characters in HTTP headers.

Forcing each path segment in the to be URL encoded solves the issue, this is my workaround:

    const originalRedirect = res.redirect;
    await redirectToPreviewURL({
      req,
      res: {
        ...res,
        redirect: ((url: string) => {
          const encodedUrl = url.split('/').map(encodeURIComponent).join('/');
          return originalRedirect(encodedUrl);
        }) as NextApiResponse['redirect'],
      },
      client,
      basePath,
    });

[github-actions]

This issue has been labeled as a bug since it was created using the 🚨 Bug Report Template.

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[angeloashmore]

Hey @sylvaingi, thanks for the bug report. I haven't had a chance to look at this yet, but I just wanted to let you know it isn't being ignored. 🙂