Issue Type

• [X ] Bug Report
• [X ] Feature Request
• Question/Support

Current Behavior

• Right now the package seems to allow for downloading student results using get_assignment_submissions, but when I use it an error appears stating I do not have the rights, although I do. When looking further into the function it seems that, at least in my canvas system, the following path does not exist /students/submissions/.
• Also, inspired by Jon Vik's work I was planning on writing a get_course_gradebook function that would search for both regular assignments and quiz results in the course and bundle these into one data.frame, hopefully to later on uploading it after processing adjustments. In that case both quiz and assignment results should be sought in the system.

Suggestion

I would suggest to add a function similar to this one:

get_submissions <- function (canvas, course_id, type, id, per_page = 100)
{
    if (!type %in% c("quizzes", "assignments"))
        stop("type must be 'quizzes' or 'assignments'")
    url <- paste0(canvas$base_url, "/api/v1/courses/", course_id, "/",
        type, "/", id, "/submissions?per_page=", per_page)
    response <- httr::GET(url, httr::add_headers(Authorization = paste("Bearer",
        canvas$api_key)))
    if (httr::status_code(response) != 200) {
        stop("Failed to retrieve assignment submissions. Please check your authentication and API endpoint.")
    }
    if(type == "quizzes") {
        submissions <- httr::content(response, "text", encoding = "UTF-8") %>%
        jsonlite::fromJSON(flatten = TRUE) %>% .[[1]]
    } else {
        submissions <- httr::content(response, "text", encoding = "UTF-8") %>%
        jsonlite::fromJSON(flatten = TRUE) 
    }
    return(submissions)        
}

Here:

• type would be either "quizzes" or "assignments".
• id would be either a quiz_id or assigenment_id, depending on type.

Not sure

Not sure if that would be something that could be added because there is already a get_assignment_submissions function, and possibly you would prefer different functions for assignments and quizzes.