User struct + CRUD operations

[sneha-afk]

Changelog

• A User struct has been added to the crud package. Its usage is similar to the preexisting Tasks struct.
• IMPORTANT! Username and Picture are not fields that are stored to our DB but are supplied by Auth0 upon login. I kept these for future use once we have more user customization + giving something to the frontend to display
• I have added the CRUD operations to UserTable that read/write from the User struct.
• I have added unit tests for these operations

Usage

Assume that if all went well once a user logs in, there is a key called user_profile in the Gin session cookies held within the Gin context. Here is an example of retrieving the corresponding User of the logged in user.

• session := sessions.Default(c): get the cookie store associated with a Gin context c
• Retrieve the user_profile key and typecast it properly into a crud.User type. Use the second return var ok to make sure it typecasted ok.

session := sessions.Default(c)
userProfile, ok := session.Get("user_profile").(crud.User)
if !ok {
        c.String(http.StatusInternalServerError, "naur :(")
        return
}

Current example in getAllUserTasks()

// Returns a list of all tasks of the current user
func getAllUserTasks(c *gin.Context) {
	// Retrieve the user_id through the struct stored in the session
	session := sessions.Default(c)
	userProfile, ok := session.Get("user_profile").(crud.User)
	if !ok {
		c.String(http.StatusInternalServerError, "Couldn't retreive user's id to display tasks.")
		return
	}
	uid := userProfile.UserID