forked from fiston/ussd-java-sample
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathUssdHandler.java
More file actions
141 lines (124 loc) · 4.74 KB
/
UssdHandler.java
File metadata and controls
141 lines (124 loc) · 4.74 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
package ussd.sample;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.google.gson.Gson;
/**
* Servlet implementation class UssdHandler
*/
@WebServlet("/UssdHandler")
public class UssdHandler extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException{
// Set the output character encoding
response.setCharacterEncoding("UTF-8");
response.setContentType("application/json");
// Set the output printer
PrintWriter out = response.getWriter();
try{
// Variable holding the ussd response
UssdResponse ussdResponse = new UssdResponse();
// Receive the Ussd request raw data
StringBuilder requestBuffer = new StringBuilder();
String lineRead;
while((lineRead = request.getReader().readLine()) != null){
requestBuffer.append(lineRead);
}
// Parse the request raw data into the UssdRequest Object for better manipulation
// since the request raw data comes in a json format.
Gson gson = new Gson();
UssdRequest ussdRequest = gson.fromJson(requestBuffer.toString(), UssdRequest.class);
// Process the Ussd request
if(ussdRequest != null){
System.out.println("Ussd Request " + ussdRequest.toString());
// check the various request type
if(ussdRequest.getType().equals("Initiation")){
// Set the ussd response
ussdResponse.setType("Response");
ussdResponse.setMessage("Welcome to Freebie Service.\n 1. Free Food\n2. Free Drink\n3. Free Airtime");
}
else if(ussdRequest.getType().equals("Response")){
// response case studies
if(!ussdRequest.getMessage().isEmpty()){
// check whether the lcient state is sent
if(ussdRequest.getClientState() == null){
// Free food is chosen
if(ussdRequest.getMessage().equals("1")){
ussdResponse.setMessage("Are you sure you want free food?\n1. Yes\n2. No");
ussdResponse.setType("Response");
ussdResponse.setClientState("FF");
}
// Free drink is chosen
else if(ussdRequest.getMessage().equals("2")){
ussdResponse.setMessage("Are you sure you want free drink?\n1. Yes\n2. No");
ussdResponse.setType("Response");
ussdResponse.setClientState("FD");
}
// Free airtime is chosen
else if(ussdRequest.getMessage().equals("3")){
ussdResponse.setMessage("Are you sure you want free airtime?\n1. Yes\n2. No");
ussdResponse.setType("Response");
ussdResponse.setClientState("FA");
}
else{
ussdResponse.setMessage("Invalid Option");
ussdResponse.setType("Release");
}
}
else{
// The client state is resent back to us
if(ussdRequest.getClientState().equals("FF") && ussdRequest.getMessage().equals("1")){
ussdResponse.setMessage("Thank you. You will receive your free food shortly.");
ussdResponse.setType("Release");
}
else if(ussdRequest.getClientState().equals("FD") && ussdRequest.getMessage().equals("1")){
ussdResponse.setMessage("Thank you. You will receive your free drink shortly.");
ussdResponse.setType("Release");
}
else if(ussdRequest.getClientState().equals("FA") && ussdRequest.getMessage().equals("1")){
ussdResponse.setMessage("Thank you. You will receive your free airtime shortly.");
ussdResponse.setType("Release");
}
else if(ussdRequest.getMessage().equals("2")){
ussdResponse.setMessage("Order Cancelled.");
ussdResponse.setType("Release");
}
else{
ussdResponse.setMessage("Unexpected Response.");
ussdResponse.setType("Release");
}
}
}
else{
ussdResponse.setMessage("Invalid option.");
ussdResponse.setType("Release");
}
}
}else{
ussdResponse.setMessage("Duh.");
ussdResponse.setType("Release");
}
System.out.println("Ussd response : " +ussdResponse.toString());
String responseJson = gson.toJson(ussdResponse);
out.print(responseJson);
}
catch(Exception e){
// Send at least a message to the user in case of errors
try{
Gson gson = new Gson();
UssdResponse ussdResponse = new UssdResponse();
ussdResponse.setMessage("Invalid request");
ussdResponse.setType("Release");
String responseJson = gson.toJson(ussdResponse);
out.print(responseJson);
}
catch(Exception ex){
ex.printStackTrace();
}
e.printStackTrace();
}
}
}