Get an Innovator OAuth token. For definitions of httpReq() and getJSON(), check out https://github.com/ArasLabs/rest-upload-example/blob/master/Code/js/my-upload.js.

araslabs_GetOAuthToken.js

/**
 * Retrieves a token from the Innovator auth server using the provided user credentials.
 * Returns a new OAuth token string.
 * 
 * @param creds An object containing credentials for connecting to an Innovator instance.
 * @param {string} creds.url Innovator url. Ex: http://localhost/Innovator12
 * @param {string} creds.db Innovator database name.
 * @param {string} creds.user User's login name.
 * @param {string} creds.pwd MD5 hash of the user's password.
 * 
 * @returns {string} The OAuth token returned from the server.
 */
async function getOAuthToken(creds) {
    try {
        // get the OAuth server url
        var discovery_url = creds.url + "/Server/OAuthServerDiscovery.aspx";
        var oauth_res = await httpReq("GET", discovery_url);
        var oauth_obj = getJSON(oauth_res);
        var oauth_url = oauth_obj.locations[0].uri;

        // get the OAuth server token endpoint url
        var get_endpoint_url = oauth_url + ".well-known/openid-configuration";
        var endpoint_res = await httpReq("GET", get_endpoint_url);
        var endpoint_obj = getJSON(endpoint_res);
        var token_url = endpoint_obj.token_endpoint;

        // build the OAuth token request
        var token_headers = [];

        var token_body = new FormData();
        token_body.set("grant_type", "password");
        token_body.set("scope", "Innovator");
        token_body.set("client_id", "IOMApp");
        token_body.set("username", creds.user);
        token_body.set("password", creds.pwd);
        token_body.set("database", creds.db);

        // get the token
        var token_res = await httpReq("POST", token_url, token_headers, token_body);
        var token_obj = getJSON(token_res);
        var token = token_obj.access_token;

        return token;

    } catch (err) {
        throw new Error("Error in getOAuthToken: " + err.message);
    }
}
// For definitions of httpReq() and getJSON(), check out the project: 
// https://github.com/ArasLabs/rest-upload-example/blob/master/Code/js/my-upload.js.