private bool TryExtractRole(string source, out ContextRole role)
{
var roleFound = true;
role = default(ContextRole);
do
{
// Parse cases like lism:<role>
int start = source.IndexOf(':') + 1;
if (Enum.TryParse(source.Substring(start), out role))
{
break;
}
// Parse cases like urn: urn:lti:role:ims/lis/<role>/<sub-role>
start = source.IndexOf(UrnPrefix) + UrnPrefix.Length;
var end = source.IndexOf('/', start);
if (Enum.TryParse(source.Substring(start, end - start), out role))
{
break;
}
// Parse cases like uri: http://purl.imsglobal.org/vocab/lis/v2/mm#<role>
start = source.LastIndexOf('#') + 1;
if (Enum.TryParse(source.Substring(start), out role))
{
break;
}
roleFound = false;
} while (!roleFound);
return(roleFound);
}
private void ContextRolesAreConvertedFromJsonLdObjects()
{
var expectedContextRoles = new ContextRole[]
{
ContextRole.Instructor,
ContextRole.Administrator,
ContextRole.Learner,
ContextRole.ContentDeveloper
};
var inputContextRoles = "{ roles: [ " +
"\"lism:Instructor\", " +
"\"http://purl.imsglobal.org/vocab/lis/v2/person#Administrator\", " +
"\"Learner\", " +
"\"urn:lti:role:ims/lis/ContentDeveloper/ContentExpert\"" +
"]}";
var actualContextRoles = JsonConvert.DeserializeObject <RoleTestObject>(inputContextRoles);
Assert.Equal(actualContextRoles.Roles, expectedContextRoles);
}
public void ContextRolesAreConvertedToJsonLdValues()
{
const ContextRole contextRole = ContextRole.Instructor;
Assert.Equal("\"lism:Instructor\"", contextRole.ToJsonLdString());
}