Slackr

Slackr was built as part of UNSW's Software Engineering Fundamentals course and the hosted web application can be found here. Specifically, our group built the backend system per the specifications in the Overview section; since the course, I updated the web application to use a persistent database and hosted the project.

Overview

Rather than re-invent the wheel, UNSW has decided that it finds the functionality of Slack to be nearly exactly what it needs. For this reason, UNSW has contracted out Lit Pty Ltd (a small software business run by Hayden) to build the new product. In UNSW's attempt to connect with the younger and more "hip" generation that fell in love with flickr, Tumblr, etc, they would like to call the new UNSW-based product slackr.

Beside the information available in the interface that Sally and Bob provided, you have been told (so far) that the features of slackr that UNSW would like to see implemented include:

Ability to login, register if not registered, and log out
Ability to reset password if forgotten it
Ability to see a list of channels
Ability to create a channel, join a channel, invite someone else to a channel, and leave a channel
Within a channel, ability to view all messages, view the members of the channel, and the details of the channel
Within a channel, ability to send a message now, or to send a message at a specified time in the future
Within a channel, ability to edit, remove, pin, unpin, react, or unreact to a message
Ability to view user anyone's user profile, and modify a user's own profile (name, email, handle, and profile photo)
Ability to search for messages based on a search string
Ability to modify a user's privileges: (MEMBER, OWNER)
Ability to begin a "standup", which is an X minute period where users can send messages that at the end of the period will automatically be collated and summarised to all users

Interface specifications

Data types

Variable name	Type
named exactly email	string
named exactly id	integer
named exactly length	integer
named exactly password	string
named exactly token	string
named exactly message	string
contains substring name	string
contains substring code	string
has prefix is_	boolean
has prefix time_	integer (unix timestamp), check this out
has suffix _id	integer
has suffix _url	string
has suffix _str	string
has suffix end	integer
has suffix start	integer
(outputs only) named exactly user	Dictionary containing u_id, email, name_first, name_last, handle_str, profile_img_url
(outputs only) named exactly users	List of dictionaries, where each dictionary contains types u_id, email, name_first, name_last, handle_str, profile_img_url
(outputs only) named exactly messages	List of dictionaries, where each dictionary contains types { message_id, u_id, message, time_created, reacts, is_pinned }
(outputs only) named exactly channels	List of dictionaries, where each dictionary contains types { channel_id, name }
(outputs only) name ends in members	List of dictionaries, where each dictionary contains types { u_id, name_first, name_last, profile_img_url }
(outputs only) name ends in reacts	List of dictionaries, where each dictionary contains types { react_id, u_ids, is_this_user_reacted } where react_id is the id of a react, and u_ids is a list of user id's of people who've reacted for that react. is_this_user_reacted is whether or not the authorised user has been one of the reacts to this post

profile_img_url & image uploads

For outputs with data pertaining to a user, a profile_img_url is present. When images are uploaded for a user profile, after processing them you should store them on the server such that your server now locally has a copy of the cropped image of the original file linked. Then, the profile_img_url should be a URL to the server, such as http://localhost:5001/imgurl/adfnajnerkn23k4234.jpg (a unique url you generate).

Note: This is most likely the most challenging part of the project. Don't get lost in this, we would strongly recommend most teams complete this capability last.

Token

Many of these functions (nearly all of them) need to be called from the perspective of a user who is logged in already. When calling these "authorised" functions, we need to know:

Which user is calling it
That the person who claims they are that user, is actually that user

We could solve this trivially by storing the user ID of the logged in user on the front end, and every time the front end (from Sally and Bob) calls your background, they just sent a user ID. This solves our first problem (1), but doesn't solve our second problem! Because someone could just "hack" the front end and change their user id and then log themselves in as someone else.

To solve this when a user logs in or registers the backend should return a "token" (an authorisation hash) that the front end will store and pass into most of your functions in future. When these "authorised" functions are called, you can check if a token is valid, and determine the user ID.

Error raising for the frontend

For errors to be appropriately raised on the frontend, they must be raised by the following:

if True: # condition here
    raise InputError(description='Description of problem')

The types in error.py have been modified appropriately for you.

Reacts

The only React ID currently associated with the frontend is React ID 1, which is a thumbs up. You are welcome to add more (this will require some frontend work)

Permissions:

Members in a channel have one of two channel permissions.
- 1. Owner of the channel (the person who created it, and whoever else that creator adds)
- 1. Members of the channel
Slackr user's have two global permissions
- 1. Owners, who can also modify other owners' permissions. (permission_id 1)
- 1. Members, who do not have any special permissions. (permission_id 2)
All slackr users are by default members, except for the very first user who signs up, who is an owner

A user's primary permissions are their global permissions. Then the channel permissions are layered on top. For example:

An owner of slackr has owner privileges in every channel they've joined
A member of slackr is a member in channels they are not owners of
A member of slackr is an owner in channels they are owners of

Standups

Once standups are finished, all of the messages sent to standup/send are packaged together in one single message posted by the user who started the standup and sent as a message to the channel the standup was started in, timestamped at the moment the standup finished.

The structure of the packaged message is like this:

For example:

hayden: I ate a catfish
rob: I went to kmart
michelle: I ate a toaster
isaac: my catfish ate a toaster

Standups can be started on the frontend by typing "/standup X", where X is the number of seconds that the standup lasts for, into the message input and clicking send.

Errors for all functions

AccessError

For all functions except auth/register, auth/login
Error thrown when token passed in is not a valid token

Pagination

The behaviour in which channel_messages returns data is called pagination. It's a commonly used method when it comes to getting theoretially unbounded amounts of data from a server to display on a page in chunks. Most of the timelines you know and love - Facebook, Instagram, LinkedIn - do this.

For example, if we imagine a user with token "12345" is trying to read messages from channel with ID 6, and this channel has 124 messages in it, 3 calls from the client to the server would be made. These calls, and their corresponding return values would be:

channel_messages("12345", 6, 0) => { [messages], 0, 50 }
channel_messages("12345", 6, 50) => { [messages], 50, 100 }
channel_messages("12345", 6, 100) => { [messages], 100, -1 }

Other Comments

All IDs (e.g. user id, channel id) uniquely identify a data item for its entire existence. Even if that item is removed, the ID cannot be reused for any new or other existing items.

Interface

HTTP Route	HTTP Method	Parameters	Return type	Exceptions	Description
auth/login	POST	(email, password)	{ u_id, token }	InputError when any of: Email entered is not a valid email using the method provided here (unless you feel you have a better method) Email entered does not belong to a user Password is not correct	Given a registered users' email and password and generates a valid token for the user to remain authenticated
auth/logout	POST	(token)	{ is_success }	N/A	Given an active token, invalidates the taken to log the user out. If a valid token is given, and the user is successfully logged out, it returns true, otherwise false.
auth/register	POST	(email, password, name_first, name_last)	{ u_id, token }	InputError when any of: Email entered is not a valid email using the method provided here (unless you feel you have a better method). Email address is already being used by another user Password entered is less than 6 characters long name_first not is between 1 and 50 characters inclusive in length name_last is not between 1 and 50 characters inclusive in length	Given a user's first and last name, email address, and password, create a new account for them and return a new token for authentication in their session. A handle is generated that is the concatentation of a lowercase-only first name and last name. If the concatenation is longer than 20 characters, it is cutoff at 20 characters. If the handle is already taken, you may modify the handle in any way you see fit to make it unique.
auth/passwordreset/request	POST	(email)	{}	N/A	Given an email address, if the user is a registered user, send's them a an email containing a specific secret code, that when entered in auth_passwordreset_reset, shows that the user trying to reset the password is the one who got sent this email.
auth/passwordreset/reset	POST	(reset_code, new_password)	{}	InputError when any of: reset_code is not a valid reset code Password entered is not a valid password	Given a reset code for a user, set that user's new password to the password provided
channel/invite	POST	(token, channel_id, u_id)	{}	InputError when any of: channel_id does not refer to a valid channel that the authorised user is part of. u_id does not refer to a valid user AccessError when the authorised user is not already a member of the channel	Invites a user (with user id u_id) to join a channel with ID channel_id. Once invited the user is added to the channel immediately
channel/details	GET	(token, channel_id)	{ name, owner_members, all_members }	InputError when any of: Channel ID is not a valid channel AccessError when Authorised user is not a member of channel with channel_id	Given a Channel with ID channel_id that the authorised user is part of, provide basic details about the channel
channel/messages	GET	(token, channel_id, start)	{ messages, start, end }	InputError when any of: Channel ID is not a valid channel start is greater than the total number of messages in the channel AccessError when Authorised user is not a member of channel with channel_id	Given a Channel with ID channel_id that the authorised user is part of, return up to 50 messages between index "start" and "start + 50" exclusive. Message with index 0 is the most recent message in the channel. This function returns a new index "end" which is the value of "start + 50", or, if this function has returned the least recent messages in the channel, returns -1 in "end" to indicate there are no more messages to load after this return.
channel/leave	POST	(token, channel_id)	{}	InputError when any of: Channel ID is not a valid channel AccessError when Authorised user is not a member of channel with channel_id	Given a channel ID, the user removed as a member of this channel
channel/join	POST	(token, channel_id)	{}	InputError when any of: Channel ID is not a valid channel AccessError when channel_id refers to a channel that is private (when the authorised user is not an owner)	Given a channel_id of a channel that the authorised user can join, adds them to that channel
channel/addowner	POST	(token, channel_id, u_id)	{}	InputError when any of: Channel ID is not a valid channel When user with user id u_id is already an owner of the channel AccessError when the authorised user is not an owner of the slackr, or an owner of this channel	Make user with user id u_id an owner of this channel
channel/removeowner	POST	(token, channel_id, u_id)	{}	InputError when any of: Channel ID is not a valid channel When user with user id u_id is not an owner of the channel AccessError when the authorised user is not an owner of the slackr, or an owner of this channel	Remove user with user id u_id an owner of this channel
channels/list	GET	(token)	{ channels }	N/A	Provide a list of all channels (and their associated details) that the authorised user is part of
channels/listall	GET	(token)	{ channels }	N/A	Provide a list of all channels (and their associated details)
channels/create	POST	(token, name, is_public)	{ channel_id }	InputError when any of: Name is more than 20 characters long	Creates a new channel with that name that is either a public or private channel
message/send	POST	(token, channel_id, message)	{ message_id }	InputError when any of: Message is more than 1000 characters AccessError when: the authorised user has not joined the channel they are trying to post to	Send a message from authorised_user to the channel specified by channel_id
message/sendlater	POST	(token, channel_id, message, time_sent)	{ message_id }	InputError when any of: Channel ID is not a valid channel Message is more than 1000 characters Time sent is a time in the past AccessError when: the authorised user has not joined the channel they are trying to post to	Send a message from authorised_user to the channel specified by channel_id automatically at a specified time in the future
message/react	POST	(token, message_id, react_id)	{}	InputError when any of: message_id is not a valid message within a channel that the authorised user has joined react_id is not a valid React ID. The only valid react ID the frontend has is 1 Message with ID message_id already contains an active React with ID react_id from the authorised user	Given a message within a channel the authorised user is part of, add a "react" to that particular message
message/unreact	POST	(token, message_id, react_id)	{}	InputError message_id is not a valid message within a channel that the authorised user has joined react_id is not a valid React ID Message with ID message_id does not contain an active React with ID react_id	Given a message within a channel the authorised user is part of, remove a "react" to that particular message
message/pin	POST	(token, message_id)	{}	InputError when any of: message_id is not a valid message Message with ID message_id is already pinned AccessError when any of: The authorised user is not a member of the channel that the message is within The authorised user is not an owner	Given a message within a channel, mark it as "pinned" to be given special display treatment by the frontend
message/unpin	POST	(token, message_id)	{}	InputError when any of: message_id is not a valid message Message with ID message_id is already unpinned AccessError when any of: The authorised user is not a member of the channel that the message is within The authorised user is not an owner	Given a message within a channel, remove it's mark as unpinned
message/remove	DELETE	(token, message_id)	{}	InputError when any of: Message (based on ID) no longer exists AccessError when none of the following are true: Message with message_id was sent by the authorised user making this request The authorised user is an owner of this channel or the slackr	Given a message_id for a message, this message is removed from the channel
message/edit	PUT	(token, message_id, message)	{}	AccessError when none of the following are true: Message with message_id was sent by the authorised user making this request The authorised user is an owner of this channel or the slackr	Given a message, update it's text with new text. If the new message is an empty string, the message is deleted.
user/profile	GET	(token, u_id)	{ user }	InputError when any of: User with u_id is not a valid user	For a valid user, returns information about their user id, email, first name, last name, handle, and image profile URL.
user/profile/setname	PUT	(token, name_first, name_last)	{}	InputError when any of: name_first is not between 1 and 50 characters inclusive in length name_last is not between 1 and 50 characters inclusive in length	Update the authorised user's first and last name
/user/profile/setemail	PUT	(token, email)	{}	InputError when any of: Email entered is not a valid email using the method provided here (unless you feel you have a better method). Email address is already being used by another user	Update the authorised user's email address
/user/profile/sethandle	PUT	(token, handle_str)	{}	InputError when any of: handle_str must be between 2 and 20 characters inclusive handle is already used by another user	Update the authorised user's handle (i.e. display name)
/user/profile/uploadphoto	POST	(token, img_url, x_start, y_start, x_end, y_end)	{}	InputError when any of: img_url returns an HTTP status other than 200. any of x_start, y_start, x_end, y_end are not within the dimensions of the image at the URL. Image uploaded is not a JPG	Given a URL of an image on the internet, crops the image within bounds (x_start, y_start) and (x_end, y_end). Position (0,0) is the top left.
users/all	GET	(token)	{ users}	N/A	Returns a list of all users and their associated details
/search	GET	(token, query_str)	{ messages }	N/A	Given a query string, return a collection of messages in all of the channels that the user has joined that match the query. Results are sorted from most recent message to least recent message
standup/start	POST	(token, channel_id, length)	{ time_finish }	InputError when any of: Channel ID is not a valid channel An active standup is currently running in this channel	For a given channel, start the standup period whereby for the next "length" seconds if someone calls "standup_send" with a message, it is buffered during the X second window then at the end of the X second window a message will be added to the message queue in the channel from the user who started the standup. X is an integer that denotes the number of seconds that the standup occurs for
standup/active	GET	(token, channel_id)	{ is_active, time_finish }	InputError when any of: Channel ID is not a valid channel	For a given channel, return whether a standup is active in it, and what time the standup finishes. If no standup is active, then time_finish returns None
standup/send	POST	(token, channel_id, message)	{}	InputError when any of: Channel ID is not a valid channel Message is more than 1000 characters An active standup is not currently running in this channel AccessError when The authorised user is not a member of the channel that the message is within	Sending a message to get buffered in the standup queue, assuming a standup is currently active
admin/userpermission/change	POST	(token, u_id, permission_id)	{}	InputError when any of: u_id does not refer to a valid user permission_id does not refer to a value permission AccessError when The authorised user is not an owner	Given a User by their user ID, set their permissions to new permissions described by permission_id
admin/user/remove	DELETE	(token, u_id)	{}	InputError when: u_id does not refer to a valid user AccessError when The authorised user is not an owner of the slackr	Given a User by their user ID, remove the user from the slackr.
workspace/reset	POST	()	{}		Resets the workspace state

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