block33.js

// server/src/graphql/s3.js
...
const presignDocument = async (_, { fileName, isPublic, token }, __, ___) => {
  // This token comes from the passwordless login
  if (!token) {
    throw new Error(NOT_AUTHENTICATED);
  }

  try {
    // identify the student
    const data = jwt.verify(token, accessTokenSecret);
    console.info(
      `Student with id ${data.id} is presigning filename ${fileName}`
    );
    // presign the post requests
    const uploadData = await s3.presignedPostDocument(fileName, isPublic);
    // return the response as a stringified JSON
    return JSON.stringify(uploadData);
  } catch (err) {
    console.log('An error ocurred when presigning document:', err);
    throw new Error(INTERNAL_ERROR);
  }
};
...