Manage CORS

For some sites, I was getting the famous "Access-Control-Allow-Origin" error.

Solution

To counter this, I found and used a GitHub repository: https://github.com/Bassetts/warp-cors.

I use the warp-cors.exe release executable that I've integrated into my application's resources. This executable is launched when the application is started and closes when it is closed. It opens an HTTP server on port 61337 (which I define in the startup command) and I make my requests not to the URL directly but to http://127.0.0.1:61337/https://example.com. I'll let you have a look at the Bassetts repository if you're interested!

Code example

This part of the code in the main.rs file opens the warp-cors.exe executable file and then closes it with the function below.

main.rs

fn main() {
    let CREATE_NO_WINDOW = 0x08000000;

    let child = Command::new("cmd")
		.args(["/C", "cd", "Resources", "&&", "warp-cors.exe", "--port", "61337"])
        .creation_flags(CREATE_NO_WINDOW)
        .spawn()
        .expect("Error launching warp-cors server process");

    unsafe {
        CHILD_PID = Some(child.id());
    }

	//...
}

#[tauri::command]
fn kill_warp_cors() {
    let CREATE_NO_WINDOW = 0x08000000;
    
    unsafe {
        if let Some(child_pid) = CHILD_PID {
            let kill_result: Result<(), std::io::Error> = Command::new("cmd")
                .args(["/C", "taskkill", "/PID", &child_pid.to_string(), "/T", "/F"])
                .creation_flags(CREATE_NO_WINDOW)
                .spawn()
                .map(|_| ());
        }
    }
}

And in the script.js file I pass requests through this server.

script.js

const url_for_bypass_cors = "http://127.0.0.1:61337"

else if (current_host === "oshi.at") {
   sent_data_form.append("f", file_to_upload);
   sent_data_form.append("expire", "120");
   upload_to_host([url_for_bypass_cors + "https://oshi.at/", "POST", sent_data_form], "text", ["match", /(?<=DL: )\S+/], [], [["match", /(?<=MANAGE: )\S+/], "GET"]);
}