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function callApi(path, perPage, callback) {
let xhr = new XMLHttpRequest()
let apiUrl = `${apiEndpoint}${path}`
if (perPage >= 1) {
// add pagination parameter
apiUrl += `${path.includes("?") ? "&" : "?"}per_page=${perPage}`
}
xhr.open("GET", apiUrl)
xhr.setRequestHeader("Authorization", authHeader)
xhr.onload = () => {
if (xhr.status == 200) {
try {
let json = JSON.parse(xhr.responseText)
if (callback) { callback(json) }
} catch (e) {
if (e instanceof SyntaxError) {
console.error(`Cannot parse response for ${path} as JSON:\n${xhr.responseText}`)
} else { throw e }
}
} else {
console.error(`XHR failed when retrieving ${path} (status ${xhr.status}):\n${xhr.responseText}`)
}
}
xhr.send()
}
function syncCanvas() {
const courses = plasmoid.configuration.courses.split("\n").map(
// each line in the "courses" config consists of
// a numeric course id, a space, and a course code
line => {
const spaceIndex = line.indexOf(" ")
return {id: line.slice(0, spaceIndex), code: line.slice(spaceIndex + 1)}
}
)
let courseIndices = {} // reverse look-up table to sort by courses
for (let i = 0; i < courses.length; i++) {
courseIndices[courses[i].id] = i
}
const showSubmittedAssignments = plasmoid.configuration.showSubmittedAssignments
// we need user id to check submission status
callApi("/users/self", 0, user => {
syncCourses(courses, courseIndices, showSubmittedAssignments, user.id)
})
}
// fetch asynchronously, but display in this order:
// important -> normal -> finished
// when an activity is both important and finished, important takes priority
function syncCourses(courses, courseIndices, showSubmittedAssignments, userId) {
announcementsModel.clear()
assignmentsModel.clear()
let announcementIndices = {
important: 0, // actually constant, kept for symmetry
normal: 0,
finished: 0,
}
let assignmentIndices = {
important: 0,
normal: 0,
finished: 0,
}
for (let course of courses) {
const courseIdx = courseIndices[course.id]
callApi(`/announcements?context_codes[]=course_${course.id}`, 50, announcements => {
announcements.forEach(announcement => {
const info = {
type: "announcement",
activityId: announcement.id,
courseId: course.id,
course: course.code,
title: announcement.title,
url: announcement.html_url,
important: plasmoid.configuration.importantAnnouncements.includes(announcement.id.toString()),
finished: plasmoid.configuration.finishedAnnouncements.includes(announcement.id.toString()),
}
// figure out where we insert it into list
let idx = 0
let endIdx = 0 // actually past the end
if (info.important) {
idx = announcementIndices.important
endIdx = announcementIndices.normal
announcementIndices.normal++
announcementIndices.finished++
} else if (!info.finished) {
idx = announcementIndices.normal
endIdx = announcementIndices.finished
announcementIndices.finished++
} else {
idx = announcementIndices.finished
endIdx = announcementsModel.count
}
for (; idx < endIdx; idx++) {
const annc = announcementsModel.get(idx)
if (courseIndices[course.id] < courseIndices[annc.courseId]) {
// we are just past the end of this course
// insert this announcement here
break
}
}
announcementsModel.insert(idx, info)
})
})
callApi(`/courses/${course.id}/assignments`, 50, assignments => {
assignments.forEach(assignment => {
callApi(`/courses/${course.id}/assignments/${assignment.id}/submissions/${userId}`, 0, submission => {
const submitted = submission.workflow_state == "submitted" ||
submission.workflow_state == "graded"
if (submitted && !showSubmittedAssignments) return // discard this
const info = {
type: "assignment",
activityId: assignment.id,
courseId: course.id,
course: course.code,
title: assignment.name,
dueAt: assignment.due_at || "", // if null, use empty string to suppress errors
submitted: submitted,
url: assignment.html_url,
important: plasmoid.configuration.importantAssignments.includes(assignment.id.toString()),
finished: plasmoid.configuration.finishedAssignments.includes(assignment.id.toString()),
}
let idx = 0
let endIdx = 0
if (info.important) {
idx = assignmentIndices.important
endIdx = assignmentIndices.normal
assignmentIndices.normal++
assignmentIndices.finished++
} else if (!info.finished) {
idx = assignmentIndices.normal
endIdx = assignmentIndices.finished
assignmentIndices.finished++
} else {
idx = assignmentIndices.finished
endIdx = assignmentsModel.count
}
for (; idx < endIdx; idx++) {
const annc = assignmentsModel.get(idx)
if (courseIndices[course.id] < courseIndices[annc.courseId]) {
break
}
}
assignmentsModel.insert(idx, info)
})
})
})
}
}
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