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 # Docs for smk-chat
 ## API
 ### /api/getCredentialsById/:userId
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 IN: _userId_ (in route)
 
 OUT: _lastname_, _firstname_, _middlename_
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 Return credentials of the user whose id is userId.
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 Return -1 if no such user exist.
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 Requires client to be logged in.
 
 ### /api/getIdByCredentials
 IN: _lastname_, _firstname_, _middlename_
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 OUT: _UserID_
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 Returns an ID of the user, whose lastname, firstname and middlename were passed.
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 Returns -1 if user does not exist.
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 Requires client to be logged in.
 
 ### /api/getMessagesFromChat/by-amount
 IN: _chatId_, _amount_
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 OUT: array of objects that represent a message, like {"author_id": ..., time_sent: ..., content: ...}
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 Returns an array of last _amount_ ordered by date of described objects if everything is okay
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 Returns HTTP/1.1 400 "Chat with id _ID_ does not exist." if no chat with supplied id does not exist.
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 Returns HTTP/1.1 403 "You are not a member of this chat" if the statement is true ;)
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 Requires client to be logged in.
 
 ### /api/getMessagesFromChat/by-time
 IN: _chatId_, _fromTimestamp_, _toTimestamp_
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 OUT: array of objects that represent a message, like {"author_id": ..., time_sent: ..., content: ...}
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 _fromTimestamp_ must be lower that _toTimestamp_, otherwise it might return nothing.
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 Returns an array of described objects if everything is okay
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 Returns HTTP/1.1 400 "Chat with id _ID_ does not exist." if no chat with supplied id does not exist.
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 Returns HTTP/1.1 200 and an empty string if no messages in chat are found /shrug.
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 Requires client to be logged in.
 
 ### /api/getChats
 IN: _UserID_
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 OUT: Array of chat IDs
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 Returs an array with ids of chats which user with passed ID is member in.
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 Return empty string if user has no membership in any chat.
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 Requires client to be logged in.
 
 ### /api/getChatInfo/:chatId
 IN: _chatId_ (in route)
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 OUT: JSON describes a chat with id: {name: ..., admins: ..., members: ...}
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 Note: JSON does not include messages. You have to use __/api/getMessagesFromChat__ to query messages.
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 Returns aforementioned json if the chat exists and user is a member of this chat.
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 Returns -1 if chat does not exist
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 Return -2 if user is not a member of the chat
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 Requires client to be logged in.
 
 ### /api/createChat
 IN: _UserId_, array of UserIDs that are to be invited.
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 OUT: "Ok" if successful, "User with id _MEMBERID_ does not exist."
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 Return -1 if amout of users to invite is 0.
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 Requires client to be logged in
 
 ### /api/logout
 IN: none.
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 OUT: redirect to __/login__.
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 Removes client's session, thus unlogging a user.
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 Requires client to be logged in.
 
 ### /api/register
 IN: _lastname_, _firstname_, _middlename_, _password_
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 OUT: redirect to __/__
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 Checks if user exist. If so, returns 400 with response "Such user exists.".
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 Otherwise, registers a user with given data.
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 Requires clinet to be not logged in.
 
 ### /api/login
 IN: _lastname_, _firstname_, _middlename_, _password_
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 OUT: redirect to __/__
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 Checks if user exists. If not, returns 400 with response "No such user.".
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 Otherwise, compares passwords
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 If passwords match, creating session and redirects to __/__
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 Requires client to be not logged in.