Canvas LMS Excuse or Grade a Submission

arazzo: 1.0.1
info:
  title: Canvas LMS Excuse or Grade a Submission
  summary: Read a submission and branch — excuse it when not submitted, otherwise post a grade.
  description: >-
    A grading-decision flow for Canvas. The workflow reads a student's
    submission for an assignment and then branches on its workflow state: when
    the student has not submitted, it excuses the submission so it is omitted from
    grade calculation; when the student has submitted, it posts a grade. Every
    step spells out its request inline so the flow can be read and executed
    without opening the underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: canvasApi
  url: ../openapi/canvas-lms-rest-api-openapi.yml
  type: openapi
workflows:
- workflowId: excuse-or-grade-submission
  summary: Grade a submitted student or excuse a non-submitter.
  description: >-
    Reads the submission, and branches to excuse it when its workflow_state is
    unsubmitted or to post a grade when the student has submitted.
  inputs:
    type: object
    required:
    - courseId
    - assignmentId
    - userId
    - postedGrade
    properties:
      courseId:
        type: string
        description: The Canvas course id.
      assignmentId:
        type: string
        description: The Canvas assignment id.
      userId:
        type: string
        description: The Canvas user id of the student.
      postedGrade:
        type: string
        description: The grade to post when the student has submitted.
  steps:
  - stepId: readSubmission
    description: >-
      Read the student's submission to determine whether they have submitted.
    operationId: getSubmission
    parameters:
    - name: course_id
      in: path
      value: $inputs.courseId
    - name: assignment_id
      in: path
      value: $inputs.assignmentId
    - name: user_id
      in: path
      value: $inputs.userId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      workflowState: $response.body#/workflow_state
    onSuccess:
    - name: notSubmitted
      type: goto
      stepId: excuseSubmission
      criteria:
      - context: $response.body
        condition: $.workflow_state == "unsubmitted"
        type: jsonpath
    - name: submitted
      type: goto
      stepId: gradeSubmission
      criteria:
      - context: $response.body
        condition: $.workflow_state != "unsubmitted"
        type: jsonpath
  - stepId: excuseSubmission
    description: >-
      Excuse the submission so it is omitted from grade calculations when the
      student has not submitted.
    operationId: gradeSubmission
    parameters:
    - name: course_id
      in: path
      value: $inputs.courseId
    - name: assignment_id
      in: path
      value: $inputs.assignmentId
    - name: user_id
      in: path
      value: $inputs.userId
    requestBody:
      contentType: application/json
      payload:
        submission:
          excuse: true
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      excused: $response.body#/excused
    onSuccess:
    - name: done
      type: end
  - stepId: gradeSubmission
    description: >-
      Post the supplied grade to the student's submission when they have
      submitted work.
    operationId: gradeSubmission
    parameters:
    - name: course_id
      in: path
      value: $inputs.courseId
    - name: assignment_id
      in: path
      value: $inputs.assignmentId
    - name: user_id
      in: path
      value: $inputs.userId
    requestBody:
      contentType: application/json
      payload:
        submission:
          posted_grade: $inputs.postedGrade
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      grade: $response.body#/grade
      score: $response.body#/score
  outputs:
    excused: $steps.excuseSubmission.outputs.excused
    grade: $steps.gradeSubmission.outputs.grade