grxMjnXp

1// To get the basic auth details
2private static void init() {
3    if(accessKey == null) {
4        accessKey='***';
5        secretKey='***';
6        host='sns.eu-west-1.amazonaws.com';
7        topic='**';
8        regionName= 'eu-west-1';
9    }
10}
11
12public static HttpResponse sendMessage(String topicName, String messageBody) {
13    init();
14    System.debug('accessKey --> ' +  accessKey);
15    System.debug('secretKey --> ' +  secretKey);
16    System.debug('host --> ' +  host);
17
18    Map<String,String> params = new Map<String,String>();
19    params.put('AWSAccessKeyId',encode(accessKey));
20    params.put('Action','Publish');
21    params.put('MessageBody',encode(messageBody));
22    params.put('Timestamp',encode(getCurrentDate()));
23    params.put('SignatureMethod','HmacSHA1');
24    params.put('SignatureVersion','2');
25    params.put('Version','2010-03-31');   
26    params.put('TargetArn','sns-euw1-ap-pe-df-product-store-products-d');
27    params.put('regionName','eu-west-1');
28
29
30    //The string to sign has to be sorted by keys
31    List<String> sortedKeys = new List<String>();
32    sortedKeys.addAll(params.keySet());
33    sortedKeys.sort();
34
35    String toSign = 'POSTn' + host +'n' + topicName + 'n';
36    Integer p = 0;
37    for (String key : sortedKeys) {
38        String value = params.get(key);
39        if (p > 0) {
40            toSign += '&';
41        }
42        p++;
43        toSign += key+'='+value;
44    }   
45
46    params.put('Signature',getMac(toSign,secretKey));                   
47
48    String url = 'https://'+ host + topicName +'?';
49    p = 0;
50    for (String key : params.keySet()) {
51        if (p > 0) {
52            url += '&';
53        }
54        p++;
55        url += key+'='+params.get(key);
56    }
57
58    HttpRequest req = new HttpRequest();
59    req.setEndPoint(url);
60    req.setMethod('POST');
61    Http http = new Http();
62    HttpResponse res = null;
63    try {
64        System.debug('Signed string: ' + toSign);
65        System.debug('Url: ' + url);
66        res = http.send(req);
67        System.debug('Status: ' + res.getStatus());
68        System.debug('Code  : ' + res.getStatusCode());
69        System.debug('Body  : ' + res.getBody());
70
71    }
72    catch (System.CalloutException e) {
73        System.debug('ERROR: ' + e);
74    }
75    return res;
76}
77
78private static String getCurrentDate() {
79    return DateTime.now().formatGmt('yyyy-MM-dd'T'HH:mm:ss.SSS'Z'');
80}
81
82//Amazon wants + and * to be escaped, but not ~
83private static String encode(String message){
84    return EncodingUtil.urlEncode(message,'UTF-8').replace('+', '%20').replace('*', '%2A').replace('%7E','~');
85}
86
87private static String getMac(String RequestString, String secretkey) {
88    String algorithmName = 'hmacSHA1';
89    Blob input = Blob.valueOf(RequestString);
90    Blob key = Blob.valueOf(secretkey);
91    Blob signing =Crypto.generateMac(algorithmName, input, key);
92    return EncodingUtil.urlEncode(EncodingUtil.base64Encode(signing), 'UTF-8');
93}