private string generateSignature(OAuthBase oauthBase, OAuthRequestViewModel vm, string sharedSecret)
{
var url = new StringBuilder(vm.TargetUrl);
//if there were no querystring parameters and the last character of the url isn't a ?, add one
//otherwise add an ampersand
url.Append(url[url.Length - 1] != '?' ? '?' : '&');
#region append all properties to query string
url.AppendFormat("{0}={1}&", "context_id", string.IsNullOrEmpty(vm.ContextId) ? null : oauthBase.UrlEncode(vm.ContextId));
url.AppendFormat("{0}={1}&", "context_label", string.IsNullOrEmpty(vm.ContextLabel) ? null : oauthBase.UrlEncode(vm.ContextLabel));
url.AppendFormat("{0}={1}&", "context_title", string.IsNullOrEmpty(vm.ContextTitle) ? null : oauthBase.UrlEncode(vm.ContextTitle));
url.AppendFormat("{0}={1}&", "context_type", string.IsNullOrEmpty(vm.ContextType) ? null : oauthBase.UrlEncode(vm.ContextType));
url.AppendFormat("{0}={1}&", "ext_lms", string.IsNullOrEmpty(vm.ExtLms) ? null : oauthBase.UrlEncode(vm.ExtLms));
url.AppendFormat("{0}={1}&", "launch_presentation_document_target", string.IsNullOrEmpty(vm.LaunchPresentationDocumentTarget) ? null : oauthBase.UrlEncode(vm.LaunchPresentationDocumentTarget));
url.AppendFormat("{0}={1}&", "launch_presentation_locale", string.IsNullOrEmpty(vm.LaunchPresentationLocale) ? null : oauthBase.UrlEncode(vm.LaunchPresentationLocale));
url.AppendFormat("{0}={1}&", "launch_presentation_return_url", string.IsNullOrEmpty(vm.LaunchPresentationReturnUrl) ? null : oauthBase.UrlEncode(vm.LaunchPresentationReturnUrl));
url.AppendFormat("{0}={1}&", "lis_course_offering_sourcedid", string.IsNullOrEmpty(vm.LisCourseOfferingSourcedid) ? null : oauthBase.UrlEncode(vm.LisCourseOfferingSourcedid));
url.AppendFormat("{0}={1}&", "lis_course_section_sourcedid", string.IsNullOrEmpty(vm.LisCourseSectionSourcedid) ? null : oauthBase.UrlEncode(vm.LisCourseSectionSourcedid));
url.AppendFormat("{0}={1}&", "lis_person_contact_email_primary", string.IsNullOrEmpty(vm.LisPersonContactEmailPrimary) ? null : oauthBase.UrlEncode(vm.LisPersonContactEmailPrimary));
url.AppendFormat("{0}={1}&", "lis_person_name_family", string.IsNullOrEmpty(vm.LisPersonNameFamily) ? null : oauthBase.UrlEncode(vm.LisPersonNameFamily));
url.AppendFormat("{0}={1}&", "lis_person_name_full", string.IsNullOrEmpty(vm.LisPersonNameFull) ? null : oauthBase.UrlEncode(vm.LisPersonNameFull));
url.AppendFormat("{0}={1}&", "lis_person_name_given", string.IsNullOrEmpty(vm.LisPersonNameGiven) ? null : oauthBase.UrlEncode(vm.LisPersonNameGiven));
url.AppendFormat("{0}={1}&", "lti_message_type", string.IsNullOrEmpty(vm.LtiMessageType) ? null : oauthBase.UrlEncode(vm.LtiMessageType));
url.AppendFormat("{0}={1}&", "lti_version", string.IsNullOrEmpty(vm.LtiVersion) ? null : oauthBase.UrlEncode(vm.LtiVersion));
url.AppendFormat("{0}={1}&", "oauth_callback", string.IsNullOrEmpty(vm.OauthCallback) ? null : oauthBase.UrlEncode(vm.OauthCallback));
url.AppendFormat("{0}={1}&", "oauth_consumer_key", string.IsNullOrEmpty(vm.OauthConsumerKey) ? null : oauthBase.UrlEncode(vm.OauthConsumerKey));
url.AppendFormat("{0}={1}&", "oauth_nonce", string.IsNullOrEmpty(vm.OauthNonce) ? null : oauthBase.UrlEncode(vm.OauthNonce));
url.AppendFormat("{0}={1}&", "oauth_signature", string.IsNullOrEmpty(vm.OauthSignature) ? null : oauthBase.UrlEncode(vm.OauthSignature));
url.AppendFormat("{0}={1}&", "oauth_signature_method", string.IsNullOrEmpty(vm.OauthSignatureMethod) ? null : oauthBase.UrlEncode(vm.OauthSignatureMethod));
url.AppendFormat("{0}={1}&", "oauth_timestamp", string.IsNullOrEmpty(vm.OauthTimestamp) ? null : oauthBase.UrlEncode(vm.OauthTimestamp));
url.AppendFormat("{0}={1}&", "oauth_version", string.IsNullOrEmpty(vm.OauthVersion) ? null : oauthBase.UrlEncode(vm.OauthVersion));
url.AppendFormat("{0}={1}&", "resource_link_id", string.IsNullOrEmpty(vm.ResourceLinkId) ? null : oauthBase.UrlEncode(vm.ResourceLinkId));
url.AppendFormat("{0}={1}&", "resource_link_title", string.IsNullOrEmpty(vm.ResourceLinkTitle) ? null : oauthBase.UrlEncode(vm.ResourceLinkTitle));
url.AppendFormat("{0}={1}&", "tool_consumer_info_product_family_code", string.IsNullOrEmpty(vm.ToolConsumerInfoProductFamilyCode) ? null : oauthBase.UrlEncode(vm.ToolConsumerInfoProductFamilyCode));
url.AppendFormat("{0}={1}&", "tool_consumer_info_version", string.IsNullOrEmpty(vm.ToolConsumerInfoVersion) ? null : oauthBase.UrlEncode(vm.ToolConsumerInfoVersion));
url.AppendFormat("{0}={1}&", "tool_consumer_instance_description", string.IsNullOrEmpty(vm.ToolConsumerInstanceDescription) ? null : oauthBase.UrlEncode(vm.ToolConsumerInstanceDescription));
url.AppendFormat("{0}={1}&", "tool_consumer_instance_guid", string.IsNullOrEmpty(vm.ToolConsumerInstanceGuid) ? null : oauthBase.UrlEncode(vm.ToolConsumerInstanceGuid));
url.AppendFormat("{0}={1}&", "tool_consumer_instance_name", string.IsNullOrEmpty(vm.ToolConsumerInstanceName) ? null : oauthBase.UrlEncode(vm.ToolConsumerInstanceName));
url.AppendFormat("{0}={1}&", "tool_consumer_instance_url", string.IsNullOrEmpty(vm.ToolConsumerInstanceUrl) ? null : oauthBase.UrlEncode(vm.ToolConsumerInstanceUrl));
url.AppendFormat("{0}={1}&", "user_id", string.IsNullOrEmpty(vm.UserId) ? null : oauthBase.UrlEncode(vm.UserId));
#endregion
string normalizedUrl;
string normalizedRequestParameters;
return oauthBase.GenerateSignature(new Uri(url.ToString()),
vm.OauthConsumerKey,
sharedSecret,
null,
null,
"POST",
vm.OauthTimestamp,
vm.OauthNonce,
out normalizedUrl, out normalizedRequestParameters);
}
//
// GET: /Home/
public ActionResult Index()
{
//get user information from SIS
var userId = "USERID";
var userEmail = "*****@*****.**";
var userFirstName = "John";
var userLastName = "Doe";
var userFullName = "John Doe";
//get integration information from Tool Provider (e.g. TaskStream)
var targetUrl = "https://www.tempuri.org/target/url";
var consumerKey = "consumerkey";
var sharedSecret = "sharedsecret";
var oauthBase = new OAuthBase();
var vm = new OAuthRequestViewModel
{
UserId = userId,
LisPersonContactEmailPrimary = userEmail,
LisPersonNameGiven = userFirstName,
LisPersonNameFamily = userLastName,
LisPersonNameFull = userFullName,
//these values come from the Tool Provider
OauthConsumerKey = consumerKey,
TargetUrl = targetUrl,
OauthTimestamp = oauthBase.GenerateTimeStamp(),
OauthNonce = oauthBase.GenerateNonce(),
};
//shared secret from tool provider
vm.OauthSignature = generateSignature(oauthBase, vm, sharedSecret);
return View(vm);
}
