CSC/ECE 517 Spring 2024 - E2421. Reimplement impersonating users (within impersonate controller.rb) - Final Project: Difference between revisions

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(Created page with "==Expertiza== [http://expertiza.ncsu.edu/ Expertiza] is a [http://rubyonrails.org/ Ruby on Rails] based open source project. Instructors have the ability to add new projects, assignments, etc., as well as edit existing ones. Later on, they can view student submissions and grade them. Students can also use Expertiza to organize into teams to work on different projects and assignments and submit their work. They can also review other students' submissions. ==Project Over...")
 
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[http://expertiza.ncsu.edu/ Expertiza] is a [http://rubyonrails.org/ Ruby on Rails] based open source project. Instructors have the ability to add new projects, assignments, etc., as well as edit existing ones. Later on, they can view student submissions and grade them. Students can also use Expertiza to organize into teams to work on different projects and assignments and submit their work. They can also review other students' submissions.
[http://expertiza.ncsu.edu/ Expertiza] is a [http://rubyonrails.org/ Ruby on Rails] based open source project. Instructors have the ability to add new projects, assignments, etc., as well as edit existing ones. Later on, they can view student submissions and grade them. Students can also use Expertiza to organize into teams to work on different projects and assignments and submit their work. They can also review other students' submissions.


==Project Overview==
==Project Overview==
Line 7: Line 8:
The goal of this project is to update the backend code for the user impersonation feature in the new version of Expertiza. The existing implementation relies on sessions, which is incompatible with the new implementation that uses JWT (JSON Web Tokens) for authentication and JSON responses. The primary challenge is to migrate the impersonation logic from session-based management to JWT-based authentication while preserving the same functionality. This reimplementation requires planning for the communication between the backend and frontend, which may necessitate modifications to existing files or the creation of new files beyond the impersonate_controller.rb file.
The goal of this project is to update the backend code for the user impersonation feature in the new version of Expertiza. The existing implementation relies on sessions, which is incompatible with the new implementation that uses JWT (JSON Web Tokens) for authentication and JSON responses. The primary challenge is to migrate the impersonation logic from session-based management to JWT-based authentication while preserving the same functionality. This reimplementation requires planning for the communication between the backend and frontend, which may necessitate modifications to existing files or the creation of new files beyond the impersonate_controller.rb file.


==Design Document==
===Current Status===
We have successfully implemented the impersonate_users.controller and the necessary methods to generate a new JWT token with the required user information. The can_impersonate method in the user.rb file has been implemented to determine which roles have the authority to impersonate other users.


We have also thoroughly tested the API and functionality using Postman and created a detailed video showcasing the tests performed.
===Issues and Plan of Action===
'''Updated UML Diagram'''
[[File:E2421-Updated UML.png]]
1. TA-Student Mapping: The current implementation does not have a mapping between Teaching Assistants (TAs) and students, which is preventing TAs from accessing specific courses for the students they are impersonating. Currently, TAs have access to all courses, which needed to be fixed. So, we will work on implementing a mapping between TAs and students to ensure that TAs can only access courses for the students they are assigned to.
2. Refactoring Code: We will work on refactoring some of the code, including changing naming conventions based on the feedback received from the first project.
3. Testing Improvement: We will enhance the testing process by:
* Incorporating Swagger UI to test the API endpoints.
* Recording and uploading a video demonstrating the execution of automated test cases.
4. Documentation Update: We will update the wiki page to address the following issues:
* Update the Role Hierarchy diagram to accurately reflect each role's permissions and get a clear idea of impersonating Hierarchy.
* Improve the flow between the five sections under Implementation and provide an explanation for the order in which these topics are covered.
* Include more detailed information about the tests performed, such as the conditions tested for.
* Replace the illegible code snippets in the screenshots with larger, more readable images or code blocks.
By addressing these issues and implementing the necessary improvements, we will aim to deliver a comprehensive and well-documented implementation of the impersonate_users functionality.
=Previous Work=
==Implementation==
==Implementation==


Line 40: Line 14:
The following UML diagram shows the association between models we will be working on
The following UML diagram shows the association between models we will be working on


[[File:Uml reimplement impersonate.png]]
[[File:UML-Diagram-E2421.jpeg]]




Line 46: Line 20:
Visualization of the hierarchical structure
Visualization of the hierarchical structure


[[File:User-hierarchy.jpg]]
[[File:Hierarchy-diagram E2421.png]]




Line 103: Line 77:
   end
   end


   def check_if_user_impersonateable?
   def is_user_impersonateable?
     impersonate_user = User.find_by(id: params[:impersonate_id])
     impersonate_user = User.find_by(id: params[:impersonate_id])
     if impersonate_user
     if impersonate_user
Line 118: Line 92:
     end
     end


     if check_if_user_impersonateable?
     if is_user_impersonateable?
       impersonate_user = User.find_by(id: params[:impersonate_id])
       impersonate_user = User.find_by(id: params[:impersonate_id])


Line 140: Line 114:
*user.rb file
*user.rb file
<pre>
<pre>
  has_many :assignments, through: :participants
  # Fetches available users whose full names match the provided name prefix (case-insensitive).
  # Returns a limited list of users (up to 10) who have roles similar or subordinate to the current user's role.
  def get_available_users(name)
    lesser_roles = role.subordinate_roles_and_self
    all_users = User.where('full_name LIKE ?', "%#{name}%").limit(20)
    visible_users = all_users.select { |user| lesser_roles.include? user.role }
    visible_users[0, 10] # the first 10
  end
   # Check if the user can impersonate another user
   # Check if the user can impersonate another user
   def can_impersonate?(user)
   def can_impersonate?(user)
     return true if role.super_administrator?
     return true if role.super_administrator?
    return true if instructor_for?(user)
    # Skip below check if user's role is "Instructor"
    return false if instructor?
    return true if teaching_assistant_for?(user)
    # Skip recursively_parent_of check if user's role is "Teaching Assistant"
    return false if teaching_assistant?
     return true if recursively_parent_of(user.role)
     return true if recursively_parent_of(user.role)
     false
     false
  end
  # Check if the current user is an instructor and has any relationship with the given user (student or TA)
  def instructor_for?(user)
    return false unless instructor?
    return true if instructor_for_student?(user)
    return true if instructor_for_ta?(user)
  end
  # Helper method to check if there are any courses where a student is enrolled in assignments
  def courses_with_student_participation(courses, student)
    courses.any? do |course|
      course.assignments.any? do |assignment|
        assignment.participants.map(&:user_id).include?(student.id)
      end
    end
  end
  # Check if the instructor has any relationship with the given student
  def instructor_for_student?(student)
    return false unless student.role.name == 'Student'  # Ensure the role is 'Student'
    instructor = Instructor.find(id)
    # Check if the instructor has any courses where the student is enrolled in an assignment
    return courses_with_student_participation(Instructor.list_all(Course, instructor),student)
  end
  # Check if the instructor has common courses with the given teaching assistant
  def instructor_for_ta?(ta)
    return false unless ta.role.name == 'Teaching Assistant'  # Ensure the role is 'Teaching Assistant'
    instructor = Instructor.find(id)
    # Get all courses taught by the instructor
    instructor_courses = Instructor.list_all(Course, instructor)
    # Get all courses associated with the TA
    ta_courses = TaMapping.get_courses(ta)
    # Convert lists to sets for efficient intersection
    instructor_course_set = instructor_courses.to_set
    ta_course_set = ta_courses.to_set
    # Check for common courses using set intersection
    has_common_course = !(instructor_course_set & ta_course_set).empty?
    return has_common_course
   end
   end


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     # because single table inheritance is not currently functioning
     # because single table inheritance is not currently functioning
     ta = Ta.find(id)
     ta = Ta.find(id)
     ta.managed_users.each do |user|
 
      return true if user.id == student.id
     # Check if the TA has any courses where the student is enrolled in an assignment
    end
    return courses_with_student_participation(TaMapping.get_courses(ta),student)
 
     false
     false
   end
   end
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   end
   end
</pre>
</pre>
===Assignment===
The Assignment model represents a task or project that is associated with a course. It is linked to a specific course and involves multiple participants (users) who are involved in or responsible for completing the assignment. Each assignment may have various users associated with it, depending on their role or participation within the course.
*assignment.rb file
<pre>
  belongs_to :course
  has_many :participants, dependent: :destroy
  has_many :users, through: :participants, inverse_of: :assignment
</pre>
===Course===
Fixed the assignment mapping
*course.rb file
<pre>
  has_many :assignments, dependent: :destroy
</pre>
===Instructor===
Created a method to get all the courses assigned to the specific instructor
*instructor.rb file
<pre>
  def self.list_all(object_type, user_id)
    object_type.where('instructor_id = ? AND private = 0', user_id)
  end
</pre>
===TA===
Refactored the code to handle a error if TA is not assigned to any course.
*ta.rb file
<pre>
  class Ta < User
    has_many :ta_mappings, dependent: :destroy
</pre>
*ta_mapping.rb file
<pre>
  #Returns course ids of the TA
  def self.get_course_ids(user_id)
    TaMapping.find_by(ta_id: user_id).course_id
    ta_mapping = TaMapping.find_by(user_id: user_id)
    ta_mapping&.course_id
  end
  #Returns courses of the TA
  def self.get_courses(user_id)
    Course.where('id = ?', get_course_ids(user_id))
    course_ids = get_course_ids(user_id)
    return Course.none unless course_ids  # Return Course.none if course_ids is nil
    Course.where(id: course_ids)
  end
end
</pre>
==Design Pattern==
===Facade Design Pattern===
The Api::V1::ImpersonateController acts as a facade by providing a simplified interface to interact with more complex subsystems (such as user authentication, authorization, and user management) within the application. It encapsulates the logic for impersonating users and fetching user lists behind a single interface.
===Strategy Design Pattern===
The is_user_impersonateable? method implements a strategy for determining whether the current user has permission to impersonate another user. It checks if the impersonated user exists and if the current user has the necessary permissions to impersonate them. This method encapsulates a specific algorithm for evaluating impersonation permissions, which can be changed or extended independently of the controller logic.
Overall, these design pattern principles contribute to a modular and maintainable design by promoting encapsulation, separation of concerns, and flexibility in the implementation of complex behaviors.


== Files added / modified ==
== Files added / modified ==
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*reimplementation-back-end/app/models/user.rb
*reimplementation-back-end/app/models/user.rb
*reimplementation-back-end/app/controllers/api/v1/impersonate_controller.rb
*reimplementation-back-end/app/controllers/api/v1/impersonate_controller.rb
*reimplementation-back-end/app/models/course.rb
*reimplementation-back-end/app/models/instructor.rb
*reimplementation-back-end/app/models/ta.rb
*reimplementation-back-end/app/models/ta_mapping.rb
*reimplementation-back-end/config/routes.rb
*reimplementation-back-end/config/routes.rb


==List of Users in Database==
==List of Users in Database==
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| 7 || dpatesl@example.com || password123 || Student
| 7 || dpatesl@example.com || password123 || Student
|}
|}


==Testing on Postman==
==Testing on Postman==
Line 203: Line 317:


*First of all, fork the expertiza workspace in order to work upon it
*First of all, fork the expertiza workspace in order to work upon it
[[File:Fork-expertiza-postman.png | 500px]]
[[File:Fork-expertiza-postman.png | 800px]]


*Fetch User List which can be impersonated (For eg: If Instructor fetches list he can see matched TAs and Students only)
*Fetch User List which can be impersonated (For eg: If Instructor fetches list he can see matched TAs and Students only)
[[File:Userlist.jpg | 500px]]
[[File:Userlist.jpg | 800px]]


* Login with provided credentials and copy the token
* Login with provided credentials and copy the token
[[File:Postman-1.jpg | 500px]]
[[File:Postman-1.jpg | 800px]]


*In the Expertiza/Authorization paste the token and save
*In the Expertiza/Authorization paste the token and save
[[File:Postman-2.jpg | 500px]]
[[File:Postman-2.jpg | 800px]]


*Put the id for the user to be impersonated
*Put the id for the user to be impersonated
[[File:Postman-3.jpg | 500px]]
[[File:Postman-3.jpg | 800px]]


*Success message if the user is impersonable
*Success message if the user is impersonable
[[File:Postman-4.jpg | 500px]]
[[File:Postman-4.jpg | 800px]]


*Failure message if the user is not impersonable (Here instructor is trying to impersonate admin)
*Failure message if the user is not impersonable (Here instructor is trying to impersonate admin)
[[File:Inst-admin.jpg | 500px]]
[[File:Inst-admin.jpg | 800px]]
 
 
==Swagger UI Documentation==
[[File:Swagger E2421.png | 1000px]]
 
 
Here is the demo video of working of the project [https://youtu.be/cq6k05-q8UI]


Here is the video of successfully running the tests [https://www.loom.com/share/b1b6b7e52a884a2f8e097e25a53e77f3?sid=e80f4d44-4667-4874-8ef8-de10f8ac1bb2]


==Team==
==Team==

Latest revision as of 23:49, 23 April 2024

Expertiza

Expertiza is a Ruby on Rails based open source project. Instructors have the ability to add new projects, assignments, etc., as well as edit existing ones. Later on, they can view student submissions and grade them. Students can also use Expertiza to organize into teams to work on different projects and assignments and submit their work. They can also review other students' submissions.


Project Overview

The goal of this project is to update the backend code for the user impersonation feature in the new version of Expertiza. The existing implementation relies on sessions, which is incompatible with the new implementation that uses JWT (JSON Web Tokens) for authentication and JSON responses. The primary challenge is to migrate the impersonation logic from session-based management to JWT-based authentication while preserving the same functionality. This reimplementation requires planning for the communication between the backend and frontend, which may necessitate modifications to existing files or the creation of new files beyond the impersonate_controller.rb file.


Implementation

UML Diagram

The following UML diagram shows the association between models we will be working on


Hierarchy Diagram

Visualization of the hierarchical structure


Request

  • GET: {BASE_URL}/api/v1/impersonate/:username
  - Response:
   "message": "Successfully Fetched User List!",
   "userList": [
       {
           "id": 4,
           "name": "Mihir",
           "full_name": "Mihir BHanderi",
           "email": "mbhande@example.com",
           "email_on_review": false,
           "email_on_submission": false,
           "email_on_review_of_review": false,
           "role": {
               "id": 4,
               "name": "Teaching Assistant"
           },
           "institution": {
               "id": 1,
               "name": "North Carolina State University"
           },
           "parent": {
               "id": null,
               "name": null
           }
       }
   ],
   "success": true
  • POST: {BASE_URL}/api/v1/impersonate
  - Payload: impersonate_id
  - Response: 
    "message": "Successfully Impersonated Ketul!",
    "token": "eyJhbGciOiJSUzI1NiJ9.eyJpZCI6MywibmFtZSI6IktldHVsIiwiZnVsbF9uYW1lIjoiS2V0dWwgQ2hheXlhIiwicm9sZSI6Ikluc3RydWN0b3IiLCJpbnN0aXR1dGlvbl9pZCI6MSwiaW1wZXJzb25hdGVkIjp0cnVlLCJvcmlnaW5hbF91c2VyIjoiIzxVc2VyOjB4MDAwMDdmMzVmYTc5YjVmOD4iLCJleHAiOjE3MTEzMjc0MTV9.U9wDOT618UCkf25MnCiK8W3ybeZv5BSQDNTEPOMUDABAvDd0HWSj3kIGccITHaoVsIykZFsyUDY3rL_M32zmfEXvxZuEleWSqUZGxbjQRIFP1bR_Q5sPESoBdlxVJ4QG8sUGQtuhOzMyH3z4R4ruhz1JpsQlalVZQHCbdtJOI9B4WKhNJ98Dls1fefnzYwLMnTr6e3ttbGGGK5Bm8zSpPvIWmCVNoueKHNptFcNejbU4Mt9RHWHLsTwdAtuywNLCu7li7RRNXo00D5JOUMxL7eB5AiQRpxah8BF7b0lM_Xh7bB56WvD5JTjoNZu3c3AK_EJksGXiFxwlPzNRc8Q",
   "success": true


Impersonate Controller

The ImpersonateController facilitates user impersonation functionality. It includes methods to fetch a list of users available for impersonation based on a provided username parameter and to impersonate a selected user by generating a new JWT token with the necessary user information. The controller ensures that impersonation requests are handled securely, validating permissions before allowing impersonation to occur.

  • impersonate_controller.rb file
 class Api::V1::ImpersonateController < ApplicationController

  # Fetches users to impersonate whose name match the passed parameter
  def get_users_list
    users = current_user.get_available_users(params[:user_name])
    render json: { message: "Successfully Fetched User List!", userList:users, success:true }, status: :ok
  end

  def is_user_impersonateable?
    impersonate_user = User.find_by(id: params[:impersonate_id])
    if impersonate_user
      return current_user.can_impersonate? impersonate_user
    end
    false
  end

  # Impersonates a new user and returns new jwt token
  def impersonate
    unless params[:impersonate_id].present?
      render json: { error: "impersonate_id is required", success:false }, status: :unprocessable_entity
      return
    end

    if is_user_impersonateable?
      impersonate_user = User.find_by(id: params[:impersonate_id])

      payload = { id: impersonate_user.id, name: impersonate_user.name, full_name: impersonate_user.full_name, role: impersonate_user.role.name,
                  institution_id: impersonate_user.institution.id, impersonated:true, original_user: current_user }
      impersonate_user_token = JsonWebToken.encode(payload, 24.hours.from_now)

      render json: { message: "Successfully Impersonated #{impersonate_user.name}!", token:impersonate_user_token, success:true }, status: :ok

    else
      render json: { error: "You do not have permission to impersonate this user", success:false }, status: :forbidden
    end
  end
end


User

These methods extend the functionality of the User model. The get_available_users method retrieves users whose full names match a provided parameter. can_impersonate? determines whether the user has the authority to impersonate another user based on their role hierarchy. teaching_assistant_for? checks if the user is a teaching assistant for a given student, and teaching_assistant? determines if the user is a teaching assistant based on their role. Lastly, recursively_parent_of recursively checks for parent-child relationships between user roles.

  • user.rb file
  has_many :assignments, through: :participants

  # Fetches available users whose full names match the provided name prefix (case-insensitive).
  # Returns a limited list of users (up to 10) who have roles similar or subordinate to the current user's role.
  def get_available_users(name)
    lesser_roles = role.subordinate_roles_and_self
    all_users = User.where('full_name LIKE ?', "%#{name}%").limit(20)
    visible_users = all_users.select { |user| lesser_roles.include? user.role }
    visible_users[0, 10] # the first 10
  end

  # Check if the user can impersonate another user
  def can_impersonate?(user)
    return true if role.super_administrator?
    return true if instructor_for?(user)
    # Skip below check if user's role is "Instructor"
    return false if instructor?
    return true if teaching_assistant_for?(user)
    # Skip recursively_parent_of check if user's role is "Teaching Assistant"
    return false if teaching_assistant?
    return true if recursively_parent_of(user.role)
    false
  end

  # Check if the current user is an instructor and has any relationship with the given user (student or TA)
  def instructor_for?(user)
    return false unless instructor?
    return true if instructor_for_student?(user)
    return true if instructor_for_ta?(user)
  end

  # Helper method to check if there are any courses where a student is enrolled in assignments
  def courses_with_student_participation(courses, student)
    courses.any? do |course|
      course.assignments.any? do |assignment|
        assignment.participants.map(&:user_id).include?(student.id)
      end
    end
  end

  # Check if the instructor has any relationship with the given student
  def instructor_for_student?(student)
    return false unless student.role.name == 'Student'  # Ensure the role is 'Student'

    instructor = Instructor.find(id)

    # Check if the instructor has any courses where the student is enrolled in an assignment
    return courses_with_student_participation(Instructor.list_all(Course, instructor),student)
  end

  # Check if the instructor has common courses with the given teaching assistant
  def instructor_for_ta?(ta)
    return false unless ta.role.name == 'Teaching Assistant'  # Ensure the role is 'Teaching Assistant'

    instructor = Instructor.find(id)

    # Get all courses taught by the instructor
    instructor_courses = Instructor.list_all(Course, instructor)

    # Get all courses associated with the TA
    ta_courses = TaMapping.get_courses(ta)

    # Convert lists to sets for efficient intersection
    instructor_course_set = instructor_courses.to_set
    ta_course_set = ta_courses.to_set

    # Check for common courses using set intersection
    has_common_course = !(instructor_course_set & ta_course_set).empty?

    return has_common_course
  end

  # Check if the user is a teaching assistant for the student's course
  def teaching_assistant_for?(student)
    return false unless teaching_assistant?
    return false unless student.role.name == 'Student'

    # We have to use the Ta object instead of User object
    # because single table inheritance is not currently functioning
    ta = Ta.find(id)

    # Check if the TA has any courses where the student is enrolled in an assignment
    return courses_with_student_participation(TaMapping.get_courses(ta),student)

    false
  end

  # Check if the user is a teaching assistant
  def teaching_assistant?
    true if role.ta?
  end

  # Recursively check if parent child relationship exists
  def recursively_parent_of(user_role)
    p = user_role.parent
    return false if p.nil?
    return true if p == self.role
    return false if p.super_administrator?
    recursively_parent_of(p)
  end

Assignment

The Assignment model represents a task or project that is associated with a course. It is linked to a specific course and involves multiple participants (users) who are involved in or responsible for completing the assignment. Each assignment may have various users associated with it, depending on their role or participation within the course.

  • assignment.rb file
  belongs_to :course
  has_many :participants, dependent: :destroy
  has_many :users, through: :participants, inverse_of: :assignment

Course

Fixed the assignment mapping

  • course.rb file
  has_many :assignments, dependent: :destroy

Instructor

Created a method to get all the courses assigned to the specific instructor

  • instructor.rb file
  def self.list_all(object_type, user_id)
    object_type.where('instructor_id = ? AND private = 0', user_id)
  end

TA

Refactored the code to handle a error if TA is not assigned to any course.

  • ta.rb file
  class Ta < User
    has_many :ta_mappings, dependent: :destroy
  • ta_mapping.rb file
  #Returns course ids of the TA
  def self.get_course_ids(user_id)
    TaMapping.find_by(ta_id: user_id).course_id
    ta_mapping = TaMapping.find_by(user_id: user_id)
    ta_mapping&.course_id
  end

  #Returns courses of the TA
  def self.get_courses(user_id)
    Course.where('id = ?', get_course_ids(user_id))
    course_ids = get_course_ids(user_id)

    return Course.none unless course_ids  # Return Course.none if course_ids is nil

    Course.where(id: course_ids)
  end
end


Design Pattern

Facade Design Pattern

The Api::V1::ImpersonateController acts as a facade by providing a simplified interface to interact with more complex subsystems (such as user authentication, authorization, and user management) within the application. It encapsulates the logic for impersonating users and fetching user lists behind a single interface.

Strategy Design Pattern

The is_user_impersonateable? method implements a strategy for determining whether the current user has permission to impersonate another user. It checks if the impersonated user exists and if the current user has the necessary permissions to impersonate them. This method encapsulates a specific algorithm for evaluating impersonation permissions, which can be changed or extended independently of the controller logic. Overall, these design pattern principles contribute to a modular and maintainable design by promoting encapsulation, separation of concerns, and flexibility in the implementation of complex behaviors.


Files added / modified

  • reimplementation-back-end/app/models/user.rb
  • reimplementation-back-end/app/controllers/api/v1/impersonate_controller.rb
  • reimplementation-back-end/app/models/course.rb
  • reimplementation-back-end/app/models/instructor.rb
  • reimplementation-back-end/app/models/ta.rb
  • reimplementation-back-end/app/models/ta_mapping.rb
  • reimplementation-back-end/config/routes.rb


List of Users in Database

ID Email Password Role
1 admin2@example.com password123 Super-Administrator
2 jay@example.com password123 Administration
3 k2l@example.com password123 Instructor
4 mbhande@example.com password123 TA
7 dpatesl@example.com password123 Student


Testing on Postman

Postman was used to manually test the additional method in impersonate_controller.rb, as well as the actions and routes of the corresponding controllers. Before testing any of these methods with Postman, submit a request to /login using the user_name and password fields, which will send an authentication token. This token must be added to Postman's 'Authorization' tab as a 'Bearer token' before any further requests can be made. Postman collection link

  • First of all, fork the expertiza workspace in order to work upon it

  • Fetch User List which can be impersonated (For eg: If Instructor fetches list he can see matched TAs and Students only)

  • Login with provided credentials and copy the token

  • In the Expertiza/Authorization paste the token and save

  • Put the id for the user to be impersonated

  • Success message if the user is impersonable

  • Failure message if the user is not impersonable (Here instructor is trying to impersonate admin)


Swagger UI Documentation


Here is the demo video of working of the project [1]


Team

Mentor

  • Chetana Chunduru <cchetan2@ncsu.edu>

Students

  • Devansh Shah <dshah8@ncsu.edu>
  • Jay Patel <jhpatel9@ncsu.edu>
  • Mihir Bhanderi <mbhande2@ncsu.edu>

Pull Request

References