index.js

const runApplescript = require('run-applescript');

let delay = 1;


/**
 * Sets the delay for actions in applescript
 * @param {int} delay timedelay in seconds
 */
exports.setDelay = (delay) => {
    delay = delay;
}


/**
 * switches Network Link Conditioner to "on"
 * @returns promise
 */
exports.on = async () => {
    return new Promise(async (resolve, reject) => {
        try {
            await runApplescript(`
            delay ${delay}
                tell application "System Preferences"
                activate
                delay ${delay}
                set current pane to pane "com.apple.Network-Link-Conditioner"
                end tell
                
                tell application "System Events"
                tell process "System Preferences"
                tell window "Network Link Conditioner"
                delay ${delay}
                    click button "ON"
                end tell
                end tell
                end tell
            `);
            this.closeSystemPreferences(true);
            resolve();
        } catch (e) {
            reject(e);
        }
    })
},

    /**
     * switches Network Link Conditioner to "off"
     * @returns promise
     */
    exports.off = async () => {
        return new Promise(async (resolve, reject) => {
            try {
                await runApplescript(`
            delay ${delay}
                tell application "System Preferences"
                activate
                delay ${delay}
                set current pane to pane "com.apple.Network-Link-Conditioner"
                end tell
                
                tell application "System Events"
                tell process "System Preferences"
                tell window "Network Link Conditioner"
                delay ${delay}
                    click button "OFF"
                    delay ${delay}
                end tell
                end tell
                end tell
            `);
                this.closeSystemPreferences(true);
                resolve();
            } catch (e) {
                console.error(e);
                reject(e)
            }
        })
    },


    /**
     * Sets a profile in the link conditioner
     * @param {string} profileName exact name of the profile to set
     * @returns promise
     */
    exports.setProfile = async (profileName = "") => {
        return new Promise(async (resolve, reject) => {
            if (profileName == "") {
                return;
            }
            try {
                const result = await runApplescript(`
            delay ${delay}
                tell application "System Preferences"
                activate
                delay ${delay}
                set current pane to pane "com.apple.Network-Link-Conditioner"
                end tell
                
                tell application "System Events"
                tell process "System Preferences"
                tell window "Network Link Conditioner"
                delay ${delay}
                    tell group 1
                        click pop up button 1
                        click menu item "${profileName}" of menu 1 of pop up button 1
                    end tell
                end tell
                end tell
                end tell
            `);
                await this.closeSystemPreferences(true);
                resolve()
            } catch (e) {
                reject(e);
                console.error(e);
            }
        })
    },

    /**
     * Gets names of available profiles
     * @returns promise that resolves to an array
     */
    exports.getProfileNames = async () => {
        return new Promise(async (resolve, reject) => {
            try {
                const result = await runApplescript(`
                    delay ${delay}
                tell application "System Preferences"
                activate
                delay ${delay}
                set current pane to pane "com.apple.Network-Link-Conditioner"
                end tell
                
                tell application "System Events"
                tell process "System Preferences"
                tell window "Network Link Conditioner"
                delay ${delay}
                    tell group 1
                        click pop up button 1
                        click menu of menu 1 of pop up button 1
                        get menu item of menu 1 of pop up button 1
                    end tell
                end tell
                end tell
                end tell
        `);
                await this.closeSystemPreferences(true);
                const menuItemRegex = /\ *menu\ item\ (.+?)\ of\ menu\ \d of pop up button \d\ of\ group\ \d of\ window Network Link Conditioner of application process System Preferences\ ?/gi;
                const menuItems = result.match(menuItemRegex);
                let profiles = [];
                for (const menuItemString of menuItems) {
                    let regex = menuItemRegex;
                    regex.lastIndex = 0;
                    let profileMatch = regex.exec(menuItemString);
                    if (profileMatch != undefined && profileMatch != null && profileMatch[1] !== undefined) {
                        const profileName = profileMatch[1];
                        if (profileName !== "Preset Profiles" && profileName !== "Custom Profiles") {//those are greyed out
                            profiles.push(profileName);
                        }
                    }
                }
                resolve(profiles)
            } catch (e) {
                this.closeSystemPreferences(true);
                reject(e);
            }
        });
    },

    /**
     * Closes the system preferences if they are open
     * @param {boolean} silentErrors sets if errors are handled silently. Default is false.
     * @returns Promise
     */
    closeSystemPreferences = (silentErrors = false) => {
        return new Promise(async (resolve, reject) => {
            try {
                const close = await runApplescript(`
                    if application "System Preferences" is running then
                    tell application "System Preferences" to quit
                end if`);
                resolve();
            } catch (e) {
                if (!silentErrors) {
                    reject(e);
                } else {
                    console.error(e);
                    resolve();
                }
            }
        });
    }
exports.closeSystemPreferences = closeSystemPreferences;