What is the process for retrieving a script from an endpoint and utilizing it as a request response?

Question

What is the process for retrieving a script from an endpoint and utilizing it as a request response?

Currently, I am working on a project where we are required to retrieve a script from an endpoint for consumption. The API designed for the web returns a self-invoking function that sets a variable. The request header specifies the content-type as application/javascript, and my goal is to extract this result from the endpoint and incorporate the variable into my application.

To illustrate this concept further, let's consider the following script:

const Script = (() => {
  return {
    some: "method",
    another: "method",
  };
})();

This script is provided by an endpoint for use in a web browser through the following script tag:

<script src="https://example.com/index.js"></script>

However, my objective is to access this script/variable for integration into my React Native application, as shown here:

fetch("https://example.com/index.js", { method: "GET" }).then((response) => {});

The issue arises when the response from the request does not align with my requirements. While I can convert it to a Blob, I am unsure about how to parse this Blob into a JavaScript function or a similar entity.

javascript typescript react-native http fetch

Answer 1

Answer №1

By employing the Function feature that utilizes eval internally, the challenge was successfully resolved.

Upon receiving a Blob script as a response, it was necessary to convert it into a string for processing. I achieved this by creating a Response instance using the Blob and subsequently utilizing the text method.

Once the string was prepared, it involved crafting a self-invoking function to transform a defined variable. This required editing the string to construct a function that would return the variable.

Finally, a function was created and executed to retrieve the desired object into a variable.

fetch("https://example.com/index.js", { method: "GET" }).then((response) => {
  new Response(response._bodyBlob).text().then((text) => {
    const modifiedString = `${text}; return Script`;

    const scriptObject = new Function(modifiedString)();
    ...
  });
});

Answer 2

By employing the Function feature that utilizes eval internally, the challenge was successfully resolved.

Upon receiving a Blob script as a response, it was necessary to convert it into a string for processing. I achieved this by creating a Response instance using the Blob and subsequently utilizing the text method.

Once the string was prepared, it involved crafting a self-invoking function to transform a defined variable. This required editing the string to construct a function that would return the variable.

Finally, a function was created and executed to retrieve the desired object into a variable.

fetch("https://example.com/index.js", { method: "GET" }).then((response) => {
  new Response(response._bodyBlob).text().then((text) => {
    const modifiedString = `${text}; return Script`;

    const scriptObject = new Function(modifiedString)();
    ...
  });
});

What is the process for retrieving a script from an endpoint and utilizing it as a request response?

Answer №1

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