public static void Perform( HttpWebRequest request,
ID2LUserContext userContext,
HandleResponse responseHandler,
HandleError errorHandler,
int retryAttempts = 0)
{
try {
using (var response = (HttpWebResponse) request.GetResponse()) {
using (var stream = response.GetResponseStream()) {
using (var reader = new StreamReader( stream, Encoding.UTF8 )) {
string responseBody = reader.ReadToEnd();
responseHandler( responseBody );
}
}
}
}
catch (WebException we) {
var exceptionWrapper = new D2LWebException( we );
var result = userContext.InterpretResult( exceptionWrapper );
switch (result) {
case RequestResult.RESULT_INVALID_TIMESTAMP:
if (retryAttempts > 0) {
// re-create the request to ensure the new url accounts for calculated skew
Uri uri = userContext.CreateAuthenticatedUri( request.RequestUri.AbsoluteUri,
request.Method );
request = (HttpWebRequest) WebRequest.Create( uri );
Perform( request, userContext, responseHandler, errorHandler, retryAttempts - 1 );
}
break;
}
errorHandler( result, request.RequestUri );
}
catch (ArgumentException) {
errorHandler( RequestResult.RESULT_UNKNOWN, request.RequestUri );
}
}
protected void CallGetVersions(ID2LUserContext userContext, int retryAttempts)
{
//in this case we are using an anonymous user
Uri uri = userContext.CreateAuthenticatedUri(
"/d2l/api/versions/", "GET");
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
request.Method = "GET";
try
{
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
using (Stream stream = response.GetResponseStream())
{
using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
{
string responseBody = reader.ReadToEnd();
JavaScriptSerializer serializer = new JavaScriptSerializer();
ProductVersions[] versions = serializer.Deserialize<ProductVersions[]>(responseBody);
String output = "";
foreach (ProductVersions v in versions)
{
output += v.ProductCode + ": " + v.LatestVersion + "<br />";
}
resultBox.InnerHtml = output;
}
}
}
}
//catches status codes in the 4 and 5 hundred series
catch (WebException we)
{
D2LWebException exceptionWrapper = new D2LWebException(we);
RequestResult result = userContext.InterpretResult(exceptionWrapper);
switch (result)
{
//if the timestamp is invalid and we haven't exceeded the retry limit then the call is made again with the adjusted timestamp
case RequestResult.RESULT_INVALID_TIMESTAMP:
if (retryAttempts > 0)
{
CallWhoAmI(userContext, retryAttempts - 1);
}
break;
}
}
}
protected void CallWhoAmI(ID2LUserContext userContext,int retryAttempts)
{
Uri uri = userContext.CreateAuthenticatedUri(
"/d2l/api/lp/1.0/users/whoami?fakeparam=lol", "GET");
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
request.Method = "GET";
request.AllowAutoRedirect = false;
try
{
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
using (Stream stream = response.GetResponseStream())
{
using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
{
string responseBody = reader.ReadToEnd();
JavaScriptSerializer serializer = new JavaScriptSerializer();
WhoAmIUser user = serializer.Deserialize<WhoAmIUser>(responseBody);
resultBox.InnerHtml = "<div>First Name: " + user.FirstName + "</div><div>Last Name: " + user.LastName + "</div><div>D2LID: " + user.Identifier + "</div>"; ;
}
}
}
}
//catches status codes in the 4 and 5 hundred series
catch (WebException we)
{
D2LWebException exceptionWrapper = new D2LWebException(we);
RequestResult result = userContext.InterpretResult(exceptionWrapper);
System.Diagnostics.Debug.WriteLine(result.ToString());
switch (result)
{
//if there is no user or the current user doesn't have permission to perform the action
case RequestResult.RESULT_INVALID_SIG:
resultBox.InnerHtml = "Error Must Authenticate as User With Permission";
break;
//if the timestamp is invalid and we haven't exceeded the retry limit then the call is made again with the adjusted timestamp
case RequestResult.RESULT_INVALID_TIMESTAMP:
if (retryAttempts > 0)
{
CallWhoAmI(userContext, retryAttempts - 1);
}
break;
}
}
}
