anonymous-consent/html_forms/analyzer.html at main · ace-lab/anonymous-consent · GitHub

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<!doctype html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Download Experiment</title>
  <script>
    const fail = (message) => {
      alert(message);
      throw new Error(message);
    };

    const hash = async (str, salt) => {
      const buf = window.crypto.subtle.digest(
        'SHA-512',
        (new TextEncoder()).encode(str + new String(salt))
      );
      return Array.from(new Uint8Array(await buf)).map((b) => b.toString(16).padStart(2, "0")).join("");
    };

    const getPrivKey = (keyData) => {
      return window.crypto.subtle.importKey(
        "jwk", keyData,
        { name: "RSA-OAEP", hash: { name: "SHA-256" }, },
        false, ["decrypt", "unwrapKey"]
      );
    };

    const getPubKey = (keyData) => {
      return window.crypto.subtle.importKey(
        "jwk", keyData,
        { name: "RSA-OAEP", hash: { name: "SHA-256" }, },
        true, ["encrypt", "wrapKey"]
      );
    };

    const loadValue = (domID) => {
      const value = document.getElementById(domID).value;
      if (!value) { fail("Expected some value at " + domID); }
      return value;
    };
  </script>
  <!-- import Bootstrap: -->
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.3.1/dist/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
</head>

<body>
  <div id="base-div" class="container">
    <div id="fetch-view">
      <script>
        const decrypt = async (data, privKey) => {
          const { ciphertext, wrappedKey, encryptedCounter } = data;
          const counter = await window.crypto.subtle.decrypt(
            { name: "RSA-OAEP" }, privKey, new Uint8Array(encryptedCounter)
          );
          const aesKey = await window.crypto.subtle.unwrapKey(
            "jwk", new Uint8Array(wrappedKey), privKey,
            { name: "RSA-OAEP" }, { name: "AES-CTR" }, false, ["decrypt"]
          );
          const AES_CTR_options = { name: "AES-CTR", counter: counter, length: 64 };
          const dataDecrypted = await window.crypto.subtle.decrypt(
            AES_CTR_options, aesKey, new Uint8Array(ciphertext)
          );
          const jsonEncodedData = (new TextDecoder()).decode(dataDecrypted);
          return JSON.parse(jsonEncodedData);
        };

        /**
          * Turns a list of uploads into a single CSV
          * @param {{
              [key: string] : {
                [key: string] : any;
              };
            }[]} jsonFormList - a list of data uploads, each with an entry per participant, each entry containing a json object of relevant data
          */
        const produceCsv = (jsonFormList) => {

          const bigJsonForm = jsonFormList.reduce((prevJsonForm, currentJsonForm, idx) => {
            // for each data upload
            Object.entries(currentJsonForm).forEach(([studentName, data]) => {
              // for each student
              // rename the columns
              // TODO: handle the case where a column requires escaping (e.g. "interactions,andstuff \"")
              const dataRenamed = Object.fromEntries(
                Object.entries(data).map(
                  ([fieldName, v])=> [(fieldName + "_" + new String(idx)), v]
                )
              );
              // and union it back into the ongoing object (default empty)
              prevJsonForm[studentName] = { ...(prevJsonForm[studentName] ?? {}), ...dataRenamed};
            });

            return prevJsonForm;
          });

          const tupleForm = Object.entries(bigJsonForm);
          const columnNames = Object.keys(tupleForm[0][1]);

          const csvRows = tupleForm.map(([studentName, rowData]) => {
            const colData = columnNames.map((colName) => rowData[colName] ?? "");
            const csvRow = ([studentName].concat(colData)).join(",");
            return csvRow;
          });

          const headerRow = ["Name"].concat(columnNames);
          return ([headerRow].concat(csvRows)).join("\n");
        };

        document.addEventListener("DOMContentLoaded", () => {
          document.getElementById("submitButton").addEventListener("click", async () => {
            const ENDPOINT = loadValue("endpointURI");
            const expName = loadValue("nameInput");
            const privJwkRaw = JSON.parse(window.atob(loadValue("privKeyInput")));
            const privJwk = await getPrivKey(privJwkRaw);

            console.log("GET", ENDPOINT + "?name=" + expName);
            const { data } = await fetch(ENDPOINT + "?name=" + expName, { method: "get", mode: 'cors' }).then(r => r.json());

            const decryptedData = await Promise.all(
              data.map(async (encryptedUpload) => {
                // Get { pseudonym : encryptedFields }
                const upload = await decrypt(encryptedUpload, privJwk);
                // Get [ pseudonym : unencryptedFields ][]
                const rowDataTuples = await Promise.all(
                  Object.entries(upload).map(
                    async ([pseudonym, encryptedRow]) =>
                      [pseudonym, await decrypt(encryptedRow, privJwk)]
                  )
                );
                const decryptedUpload = Object.fromEntries(rowDataTuples);
                return decryptedUpload;
              })
            );

            const csvData = produceCsv(decryptedData);
            const fileEncoding = window.btoa(csvData);

            // turn the decrypted data into a downloadable file
            document.getElementById("outfileATag").href = "data:text/plain;base64," + await fileEncoding;
            document.getElementById("display").hidden = false;
          });
        });
      </script>
      <h2>Download data for an Experiment:</h2>
      <div id="dialog">
        <!--  -->
        <label>
          Endpoint URL:
          <input type="url" id="endpointURI" value="https://anonymization.nelson-lojo.workers.dev/experiment"/>
        </label>
        <br />

        <label>
          Experiment Name:
          <input id="nameInput" />
        </label>
        <br />

        <p>Private Key:</p>
        <textarea id="privKeyInput"
          placeholder="Enter the private key that was generated when you created the experiment">
            </textarea>
        <br />

        <button id="submitButton" aria-label="Download data from this experiment">
          Download Data
        </button>
      </div>

      <div id="display" hidden>
        <a id="outfileATag" download>download your data</a>
      </div>
    </div>
</body>

</html>