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1 | package ro.ieval.fonbot; | |
2 | ||
3 | import static ro.ieval.fonbot.Utils.toNonNull; | |
4 | ||
5 | import java.io.IOException; | |
6 | import java.net.HttpURLConnection; | |
7 | import java.net.MalformedURLException; | |
8 | import java.net.URL; | |
9 | import java.util.ArrayList; | |
10 | import java.util.List; | |
11 | ||
12 | import org.eclipse.jdt.annotation.Nullable; | |
13 | import org.json.JSONArray; | |
14 | import org.json.JSONException; | |
15 | import org.json.JSONObject; | |
16 | ||
17 | import ro.ieval.fonbot.Address.Protocol; | |
18 | import android.content.Context; | |
19 | import android.os.AsyncTask; | |
20 | import android.preference.PreferenceManager; | |
21 | import android.util.Base64; | |
22 | import android.util.Log; | |
23 | ||
24 | import com.google.android.gcm.GCMRegistrar; | |
25 | ||
26 | /* | |
27 | * Copyright © 2013 Marius Gavrilescu | |
28 | * | |
29 | * This file is part of FonBot. | |
30 | * | |
31 | * FonBot is free software: you can redistribute it and/or modify | |
32 | * it under the terms of the GNU General Public License as published by | |
33 | * the Free Software Foundation, either version 3 of the License, or | |
34 | * (at your option) any later version. | |
35 | * | |
36 | * FonBot is distributed in the hope that it will be useful, | |
37 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
38 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
39 | * GNU General Public License for more details. | |
40 | * | |
41 | * You should have received a copy of the GNU General Public License | |
42 | * along with FonBot. If not, see <http://www.gnu.org/licenses/>. | |
43 | */ | |
44 | ||
45 | /** | |
46 | * AsyncTask that polls the server for pending commands and executes any commands found. | |
47 | * | |
48 | * @author Marius Gavrilescu <marius@ieval.ro> | |
49 | */ | |
50 | public final class PollServerAsyncTask extends AsyncTask<Void, Void, List<PollServerAsyncTask.Command>> { | |
51 | /** | |
52 | * POJO that represents a command in a basic form: a command name, a list of arguments and a reply address, all of them being strings | |
53 | * | |
54 | * @author Marius Gavrilescu <marius@ieval.ro> | |
55 | */ | |
56 | final class Command{ | |
57 | /** | |
58 | * The command name | |
59 | */ | |
60 | final String command;//NOPMD no confusion here | |
61 | /** | |
62 | * The list of command arguments | |
63 | */ | |
64 | final String[] args; | |
65 | /** | |
66 | * The reply address, excluding the protocol | |
67 | */ | |
68 | final String replyto; | |
69 | ||
70 | /** | |
71 | * Construct a Command from its three parts | |
72 | * | |
73 | * @param command the command name | |
74 | * @param args the command arguments | |
75 | * @param replyto the reply address | |
76 | */ | |
77 | Command(final String command, final String[] args, final String replyto) {//NOPMD array is immutable | |
78 | this.command=command; | |
79 | this.args=args; | |
80 | this.replyto=replyto; | |
81 | } | |
82 | } | |
83 | ||
84 | /** Context instance */ | |
85 | private final Context context; | |
86 | ||
87 | /** | |
88 | * Constructs a PollServerAsyncTask. | |
89 | * | |
90 | * @param context Context instance | |
91 | */ | |
92 | public PollServerAsyncTask(final Context context) { | |
93 | this.context=context; | |
94 | } | |
95 | ||
96 | @Override | |
97 | protected List<Command> doInBackground(final @Nullable Void... params) { | |
98 | Log.d(getClass().getName(), "Polling server"); | |
99 | final List<Command> commands=new ArrayList<Command>(10); | |
100 | try { | |
101 | final URL url=Utils.getServerURL(toNonNull(context),"/get"); | |
102 | final HttpURLConnection conn=(HttpURLConnection) url.openConnection(); | |
103 | conn.setRequestProperty("X-ID", GCMRegistrar.getRegistrationId(context)); | |
104 | final String user=PreferenceManager.getDefaultSharedPreferences(context).getString("username", null); | |
105 | final String password=PreferenceManager.getDefaultSharedPreferences(context).getString("password", null); | |
106 | if(user == null || password == null) | |
107 | return commands; | |
108 | ||
109 | conn.setRequestProperty("Authorization", "Basic "+Base64.encodeToString( | |
110 | (user+':'+password).getBytes(), Base64.NO_WRAP)); | |
111 | conn.connect(); | |
112 | Log.d(getClass().getName(), "Server poll got response code "+conn.getResponseCode()+" and message "+conn.getResponseMessage()); | |
113 | if(conn.getResponseCode()!=200) | |
114 | return commands; | |
115 | ||
116 | final JSONArray array; | |
117 | { | |
118 | final byte[] buf=new byte[4096*1024]; | |
119 | conn.getInputStream().read(buf); | |
120 | array=new JSONArray(new String(buf)); | |
121 | } | |
122 | ||
123 | for(int i=0;i<array.length();i++){ | |
124 | final JSONObject object=array.getJSONObject(i); | |
125 | ||
126 | final JSONArray jsonargs=object.getJSONArray("args"); | |
127 | final String[] args=new String[jsonargs.length()]; | |
128 | for(int j=0;j<args.length;j++) | |
129 | args[j]=jsonargs.getString(j); | |
130 | ||
131 | commands.add(new Command(//NOPMD command changes for each JSON object | |
132 | toNonNull(object.getString("command")), | |
133 | args, | |
134 | toNonNull(object.getString("replyto")))); | |
135 | } | |
136 | } catch (MalformedURLException e) { | |
137 | e.printStackTrace(); | |
138 | } catch (IOException e) { | |
139 | e.printStackTrace(); | |
140 | } catch (JSONException e) { | |
141 | e.printStackTrace(); | |
142 | } | |
143 | if(commands==null) | |
144 | throw new AssertionError("commands is null in PollServerAsyncTask#doInBackground");//silence Eclipse bug | |
145 | return commands; | |
146 | } | |
147 | ||
148 | @Override | |
149 | protected void onPostExecute(final @Nullable List<Command> commands) { | |
150 | if(commands==null) | |
151 | return; | |
152 | for (Command command : commands) { | |
153 | Log.d(getClass().getName(), "Poll got command "+command.command+" with "+((command.args.length==0)?"no args":"args "+Utils.join( | |
154 | " ",toNonNull(command.args)))); | |
155 | Utils.processCommand( | |
156 | toNonNull(context), | |
157 | toNonNull(command.command), | |
158 | toNonNull(command.args), | |
159 | new Address(toNonNull(Protocol.HTTP), command.replyto));//NOPMD address depends on command | |
160 | } | |
161 | } | |
162 | } |