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Optional API access using the public token #5

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Optional API access using the public token #5

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26 changes: 18 additions & 8 deletions Src/Recombee.ApiClient/RecombeeClient.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,8 +19,10 @@ public partial class RecombeeClient
readonly byte[] secretTokenBytes;

readonly bool useHttpsAsDefault;
readonly bool isClient;

readonly string hostUri = "rapi.recombee.com";
readonly string clientHostUri = "client-rapi.recombee.com";

readonly int BATCH_MAX_SIZE = 10000; //Maximal number of requests within one batch request

Expand All @@ -31,16 +33,21 @@ public partial class RecombeeClient
/// <param name="databaseId">ID of the database.</param>
/// <param name="secretToken">Corresponding secret token.</param>
/// <param name="useHttpsAsDefault">If true, all requests are sent using HTTPS</param>
public RecombeeClient(string databaseId, string secretToken, bool useHttpsAsDefault = true)
/// <param name="isClient">If true, access the API using client->server communication with the public token as the secretToken instead of using server->server communication with the private token</param>
public RecombeeClient(string databaseId, string secretToken, bool useHttpsAsDefault = true, bool isClient = false)
{
this.databaseId = databaseId;
this.secretTokenBytes = Encoding.ASCII.GetBytes(secretToken);
this.useHttpsAsDefault = useHttpsAsDefault;
this.isClient = isClient;
this.httpClient = createHttpClient();

var envHostUri = Environment.GetEnvironmentVariable("RAPI_URI");
if(envHostUri != null)
this.hostUri = envHostUri;
if (envHostUri != null)
{
this.hostUri = envHostUri;
this.clientHostUri = envHostUri;
}
}

private HttpClient createHttpClient()
Expand Down Expand Up @@ -280,30 +287,33 @@ private string ProcessRequestUri(Request request)
uriBuilder.Query = QueryParameters(request);
AppendHmacParameters(uriBuilder);
uriBuilder.Scheme = (request.EnsureHttps || useHttpsAsDefault) ? "https" : "http";
uriBuilder.Host = hostUri;
uriBuilder.Host = isClient ? clientHostUri : hostUri;
return uriBuilder.ToString();
}

private string QueryParameters(Request request)
{
{
var encodedQueryStringParams = request.QueryParameters().
Select (p => string.Format("{0}={1}", p.Key, WebUtility.UrlEncode(String.Format(System.Globalization.CultureInfo.InvariantCulture, "{0}", p.Value))));
return string.Join("&", encodedQueryStringParams);
}

private Int32 UnixTimestampNow()
private Int32 UnixTimestampNow()
{
return (Int32)(DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1))).TotalSeconds;
}
private void AppendHmacParameters(UriBuilder uriBuilder)
{
uriBuilder.Query = StripLeadingQuestionMark(uriBuilder.Query) + (uriBuilder.Query.Length == 0 ? "" : "&") + string.Format("hmac_timestamp={0}",this.UnixTimestampNow());
string timestampParam = isClient ? "frontend_timestamp" : "hmac_timestamp";
string signParam = isClient ? "frontend_sign" : "hmac_sign";

uriBuilder.Query = StripLeadingQuestionMark(uriBuilder.Query) + (uriBuilder.Query.Length == 0 ? "" : "&") + string.Format("{0}={1}",timestampParam,this.UnixTimestampNow());
using(var myhmacsha1 = new HMACSHA1(this.secretTokenBytes))
{
var uriToBeSigned = uriBuilder.Path + uriBuilder.Query;
byte[] hmacBytes = myhmacsha1.ComputeHash(Encoding.ASCII.GetBytes(uriToBeSigned));
string hmacRes = BitConverter.ToString(hmacBytes).Replace("-","");
uriBuilder.Query = StripLeadingQuestionMark(uriBuilder.Query) + string.Format("&hmac_sign={0}",hmacRes);
uriBuilder.Query = StripLeadingQuestionMark(uriBuilder.Query) + string.Format("&{0}={1}",signParam,hmacRes);
}
}
}
Expand Down