public BookItem[] AssignedBooks(Valence.Request.Parameters param, ref string message)
{
var classOrgInfo = new Valence.OrgUnitInfo()
{
Id = param.ClassOrgId
};
var result = new List <BookItem>();
result.AddRange(GetBooksForClass(param, classOrgInfo, ref message));
return(result.ToArray());
}
private List <BookItem> GetBooksForClass(
Valence.Request.Parameters param,
Valence.OrgUnitInfo course,
ref string message)
{
Uri uri = param.UserContext.CreateAuthenticatedUri(
"/d2l/api/" + param.ApiVersion("le") + "/" + course.Id + "/content/isbn/", "GET");
var request = (HttpWebRequest)WebRequest.Create(uri);
request.Method = "GET";
var handler = new Valence.Request.ErrorHandler();
var result = new List <BookItem>();
Valence.Request.Perform(
request, param.UserContext,
delegate(string data) {
var serializer = new JavaScriptSerializer();
var books = serializer.Deserialize <Valence.Book[]>(data);
if ((books == null) || (books.Length <= 0))
{
return;
}
foreach (Valence.Book b in books)
{
try {
GoogleBook.Volume volume = GoogleBook.Api.Query(b.Isbn);
if (volume.TotalItems != 0)
{
GoogleBook.Item item = volume.items.First();
BookItem book = FromGoogleBookToBookItem(item);
result.Add(book);
}
} catch (ArgumentNullException) {}
}
},
handler.Process);
if (handler.IsError)
{
message = "Unable to retrieve assigned books. " + handler.Message;
}
return(result);
}
public bool AddBook(Valence.Request.Parameters param, string isbn, ref string message)
{
Uri uri = param.UserContext.CreateAuthenticatedUri(
"/d2l/api/" + param.ApiVersion("le") + "/" + param.ClassOrgId + "/content/isbn/", "POST");
var bookIsbn = new Valence.IsbnAssociation {
Isbn = isbn
};
var serializer = new JavaScriptSerializer();
String postData = serializer.Serialize(bookIsbn);
var request = (HttpWebRequest)WebRequest.Create(uri);
request.Method = "POST";
request.ContentType = "application/json";
using (var requestWriter = new StreamWriter(request.GetRequestStream())) {
requestWriter.Write(postData);
}
bool result = true;
var handler = new Valence.Request.ErrorHandler();
Valence.Request.Perform(request, param.UserContext,
delegate(string data) {
var responseSerializer = new JavaScriptSerializer();
var bookResult = responseSerializer.Deserialize <Valence.Book>(data);
if (bookResult.Isbn != isbn)
{
result = false;
}
},
handler.Process);
if (handler.IsError)
{
result = false;
message = "Unable to add books to course. " + handler.Message;
}
return(result);
}
public bool RemoveBook(Valence.Request.Parameters param, string isbn, ref string message)
{
var uri = param.UserContext.CreateAuthenticatedUri(
"/d2l/api/" + param.ApiVersion("le") + "/" + param.ClassOrgId + "/content/isbn/" + isbn, "DELETE");
var request = (HttpWebRequest)WebRequest.Create(uri);
request.Method = "DELETE";
var handler = new Valence.Request.ErrorHandler();
Valence.Request.Perform(request, param.UserContext, delegate(string data) { }, handler.Process);
if (handler.IsError)
{
message = "Unable to remove books from course. " + handler.Message;
}
return(!handler.IsError);
}
