public async Task <CourseNameWithStudentNameServiceModel> GetCourseNameAndStudentName(int courseId, string studentId)
{
string courseName = await this.database
.Courses
.Where(c => c.Id == courseId)
.Select(c => c.Name)
.FirstOrDefaultAsync();
if (courseName == null)
{
return(null);
}
string studentName = await this.database
.Users
.Where(u => u.Id == studentId)
.Select(u => u.Name)
.FirstOrDefaultAsync();
if (studentName == null)
{
return(null);
}
CourseNameWithStudentNameServiceModel model = new CourseNameWithStudentNameServiceModel
{
CourseName = courseName,
StudentName = studentName
};
return(model);
}
public async Task <IActionResult> DownloadExamSubmission(int id, string studentId)
{
if (string.IsNullOrEmpty(studentId))
{
return(BadRequest());
}
string userId = this.userManager.GetUserId(User);
bool isUserTrainer = await this.trainerService.IsUserTrainerAsync(id, userId);
if (!isUserTrainer)
{
return(BadRequest());
}
byte[] examSubmissionContents = await this.trainerService.DownloadExamSubmission(id, studentId);
if (examSubmissionContents == null)
{
this.TempData.AddErrorMessage("This student did not upload exam submission yet.");
return(RedirectToAction(nameof(Course), new { id }));
}
CourseNameWithStudentNameServiceModel model = await this.trainerService.GetCourseNameAndStudentName(id, studentId);
if (model == null)
{
return(BadRequest());
}
return(File(examSubmissionContents, "application/zip", $"{model.CourseName} - {model.StudentName} - {DateTime.UtcNow.ToString("DD-MM-YYYY")}.zip"));
}
