Hyperlink-Android/app/src/main/java/dev/garrettmills/starship/hyperlink/util/APIv1.java

package dev.garrettmills.starship.hyperlink.util;

import android.content.SharedPreferences;
import android.util.Log;

import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.google.gson.Gson;

import org.json.JSONException;
import org.json.JSONObject;

import dev.garrettmills.starship.hyperlink.Hyperlink;

public class APIv1 {
    /**
     * Given an API endpoint, resolve the fully qualified URL using the stored server address.
     * Example:
     * resolveEndpoint("/auth/redeem")  // => "https://hyperlink.url/api/v1/auth/redeem"
     * @param endpoint un-qualified api endpoint
     * @return The resolved string.
     */
    public static String resolveEndpoint(String endpoint) {
        if ( !endpoint.startsWith("/") ) {
            endpoint = "/" + endpoint;
        }

        String server = Hyperlink.preferences.getString(Hyperlink.SERVER_ADDR, "");
        if ( server.endsWith("/") ) {
            server = server.substring(0, server.length() - 1);
        }

        return server + "/api/v1" + endpoint;
    }

    public static boolean isAuthenticated() {
        return !Hyperlink.preferences.getString(Hyperlink.SERVER_ADDR, "").equals("")
            && !Hyperlink.preferences.getString(Hyperlink.ACCESS_TOKEN, "").equals("");
    }

    public static AccessToken getToken() throws NotAuthenticatedException {
        if ( !isAuthenticated() ) {
            throw new NotAuthenticatedException();
        }

        return new AccessToken(
            Hyperlink.preferences.getString(Hyperlink.SERVER_ADDR, ""),
            Hyperlink.preferences.getString(Hyperlink.ACCESS_TOKEN, "")
        );
    }

    public static void logout() {
        SharedPreferences.Editor editor = Hyperlink.preferences.edit();
        editor.putString(Hyperlink.SERVER_ADDR, "");
        editor.putString(Hyperlink.ACCESS_TOKEN, "");
        editor.apply();
    }

    public static void login(LoginToken login, Runnable callback) {
        Gson gson = new Gson();
        String tokenJson = gson.toJson(login);

        try {
            JsonObjectRequest request = new JsonObjectRequest(
                Request.Method.POST,
                resolveEndpoint("/login/redeem"),
                new JSONObject(tokenJson),
                response -> {
                    try {
                        String tokenValue = response.getString("token");
                        Log.d("APIv1", "Got access token: " + tokenValue);

                        SharedPreferences.Editor editor = Hyperlink.preferences.edit();
                        editor.putString(Hyperlink.SERVER_ADDR, login.getServer());
                        editor.putString(Hyperlink.ACCESS_TOKEN, tokenValue);
                        editor.apply();
                    } catch (JSONException e) {
                        callback.run();
                    }
                },
                error -> callback.run()
            );

            Hyperlink.httpRequestQueue.add(request);
        } catch (JSONException e) {
            callback.run();
        }
    }
}