mirror of
https://github.com/overleaf/overleaf.git
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276 lines
12 KiB
CoffeeScript
276 lines
12 KiB
CoffeeScript
logger = require "logger-sharelatex"
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metrics = require "metrics-sharelatex"
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settings = require "settings-sharelatex"
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WebApiManager = require "./WebApiManager"
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AuthorizationManager = require "./AuthorizationManager"
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DocumentUpdaterManager = require "./DocumentUpdaterManager"
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ConnectedUsersManager = require "./ConnectedUsersManager"
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WebsocketLoadBalancer = require "./WebsocketLoadBalancer"
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RoomManager = require "./RoomManager"
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module.exports = WebsocketController =
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# If the protocol version changes when the client reconnects,
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# it will force a full refresh of the page. Useful for non-backwards
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# compatible protocol changes. Use only in extreme need.
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PROTOCOL_VERSION: 2
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joinProject: (client, user, project_id, callback = (error, project, privilegeLevel, protocolVersion) ->) ->
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if client.disconnected
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metrics.inc('editor.join-project.disconnected', 1, {status: 'immediately'})
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return callback()
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user_id = user?._id
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logger.log {user_id, project_id, client_id: client.id}, "user joining project"
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metrics.inc "editor.join-project"
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WebApiManager.joinProject project_id, user, (error, project, privilegeLevel, isRestrictedUser) ->
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return callback(error) if error?
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if client.disconnected
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metrics.inc('editor.join-project.disconnected', 1, {status: 'after-web-api-call'})
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return callback()
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if !privilegeLevel or privilegeLevel == ""
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err = new Error("not authorized")
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logger.warn {err, project_id, user_id, client_id: client.id}, "user is not authorized to join project"
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return callback(err)
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client.ol_context = {}
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client.ol_context["privilege_level"] = privilegeLevel
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client.ol_context["user_id"] = user_id
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client.ol_context["project_id"] = project_id
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client.ol_context["owner_id"] = project?.owner?._id
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client.ol_context["first_name"] = user?.first_name
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client.ol_context["last_name"] = user?.last_name
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client.ol_context["email"] = user?.email
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client.ol_context["connected_time"] = new Date()
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client.ol_context["signup_date"] = user?.signUpDate
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client.ol_context["login_count"] = user?.loginCount
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client.ol_context["is_restricted_user"] = !!(isRestrictedUser)
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RoomManager.joinProject client, project_id, (err) ->
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return callback(err) if err
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logger.log {user_id, project_id, client_id: client.id}, "user joined project"
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callback null, project, privilegeLevel, WebsocketController.PROTOCOL_VERSION
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# No need to block for setting the user as connected in the cursor tracking
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ConnectedUsersManager.updateUserPosition project_id, client.publicId, user, null, () ->
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# We want to flush a project if there are no more (local) connected clients
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# but we need to wait for the triggering client to disconnect. How long we wait
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# is determined by FLUSH_IF_EMPTY_DELAY.
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FLUSH_IF_EMPTY_DELAY: 500 #ms
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leaveProject: (io, client, callback = (error) ->) ->
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{project_id, user_id} = client.ol_context
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return callback() unless project_id # client did not join project
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metrics.inc "editor.leave-project"
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logger.log {project_id, user_id, client_id: client.id}, "client leaving project"
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WebsocketLoadBalancer.emitToRoom project_id, "clientTracking.clientDisconnected", client.publicId
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# We can do this in the background
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ConnectedUsersManager.markUserAsDisconnected project_id, client.publicId, (err) ->
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if err?
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logger.error {err, project_id, user_id, client_id: client.id}, "error marking client as disconnected"
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RoomManager.leaveProjectAndDocs(client)
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setTimeout () ->
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remainingClients = io.sockets.clients(project_id)
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if remainingClients.length == 0
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# Flush project in the background
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DocumentUpdaterManager.flushProjectToMongoAndDelete project_id, (err) ->
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if err?
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logger.error {err, project_id, user_id, client_id: client.id}, "error flushing to doc updater after leaving project"
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callback()
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, WebsocketController.FLUSH_IF_EMPTY_DELAY
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joinDoc: (client, doc_id, fromVersion = -1, options, callback = (error, doclines, version, ops, ranges) ->) ->
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if client.disconnected
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metrics.inc('editor.join-doc.disconnected', 1, {status: 'immediately'})
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return callback()
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metrics.inc "editor.join-doc"
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{project_id, user_id, is_restricted_user} = client.ol_context
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return callback(new Error("no project_id found on client")) if !project_id?
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logger.log {user_id, project_id, doc_id, fromVersion, client_id: client.id}, "client joining doc"
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AuthorizationManager.assertClientCanViewProject client, (error) ->
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return callback(error) if error?
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# ensure the per-doc applied-ops channel is subscribed before sending the
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# doc to the client, so that no events are missed.
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RoomManager.joinDoc client, doc_id, (error) ->
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return callback(error) if error?
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if client.disconnected
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metrics.inc('editor.join-doc.disconnected', 1, {status: 'after-joining-room'})
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# the client will not read the response anyways
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return callback()
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DocumentUpdaterManager.getDocument project_id, doc_id, fromVersion, (error, lines, version, ranges, ops) ->
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return callback(error) if error?
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if client.disconnected
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metrics.inc('editor.join-doc.disconnected', 1, {status: 'after-doc-updater-call'})
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# the client will not read the response anyways
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return callback()
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if is_restricted_user and ranges?.comments?
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ranges.comments = []
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# Encode any binary bits of data so it can go via WebSockets
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# See http://ecmanaut.blogspot.co.uk/2006/07/encoding-decoding-utf8-in-javascript.html
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encodeForWebsockets = (text) -> unescape(encodeURIComponent(text))
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escapedLines = []
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for line in lines
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try
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line = encodeForWebsockets(line)
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catch err
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logger.err {err, project_id, doc_id, fromVersion, line, client_id: client.id}, "error encoding line uri component"
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return callback(err)
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escapedLines.push line
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if options.encodeRanges
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try
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for comment in ranges?.comments or []
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comment.op.c = encodeForWebsockets(comment.op.c) if comment.op.c?
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for change in ranges?.changes or []
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change.op.i = encodeForWebsockets(change.op.i) if change.op.i?
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change.op.d = encodeForWebsockets(change.op.d) if change.op.d?
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catch err
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logger.err {err, project_id, doc_id, fromVersion, ranges, client_id: client.id}, "error encoding range uri component"
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return callback(err)
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AuthorizationManager.addAccessToDoc client, doc_id
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logger.log {user_id, project_id, doc_id, fromVersion, client_id: client.id}, "client joined doc"
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callback null, escapedLines, version, ops, ranges
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leaveDoc: (client, doc_id, callback = (error) ->) ->
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# client may have disconnected, but we have to cleanup internal state.
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metrics.inc "editor.leave-doc"
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{project_id, user_id} = client.ol_context
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logger.log {user_id, project_id, doc_id, client_id: client.id}, "client leaving doc"
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RoomManager.leaveDoc(client, doc_id)
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# we could remove permission when user leaves a doc, but because
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# the connection is per-project, we continue to allow access
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# after the initial joinDoc since we know they are already authorised.
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## AuthorizationManager.removeAccessToDoc client, doc_id
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callback()
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updateClientPosition: (client, cursorData, callback = (error) ->) ->
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if client.disconnected
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# do not create a ghost entry in redis
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return callback()
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metrics.inc "editor.update-client-position", 0.1
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{project_id, first_name, last_name, email, user_id} = client.ol_context
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logger.log {user_id, project_id, client_id: client.id, cursorData: cursorData}, "updating client position"
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AuthorizationManager.assertClientCanViewProjectAndDoc client, cursorData.doc_id, (error) ->
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if error?
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logger.warn {err: error, client_id: client.id, project_id, user_id}, "silently ignoring unauthorized updateClientPosition. Client likely hasn't called joinProject yet."
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return callback()
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cursorData.id = client.publicId
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cursorData.user_id = user_id if user_id?
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cursorData.email = email if email?
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# Don't store anonymous users in redis to avoid influx
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if !user_id or user_id == 'anonymous-user'
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cursorData.name = ""
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callback()
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else
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cursorData.name = if first_name && last_name
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"#{first_name} #{last_name}"
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else if first_name
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first_name
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else if last_name
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last_name
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else
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""
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ConnectedUsersManager.updateUserPosition(project_id, client.publicId, {
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first_name: first_name,
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last_name: last_name,
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email: email,
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_id: user_id
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}, {
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row: cursorData.row,
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column: cursorData.column,
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doc_id: cursorData.doc_id
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}, callback)
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WebsocketLoadBalancer.emitToRoom(project_id, "clientTracking.clientUpdated", cursorData)
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CLIENT_REFRESH_DELAY: 1000
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getConnectedUsers: (client, callback = (error, users) ->) ->
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if client.disconnected
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# they are not interested anymore, skip the redis lookups
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return callback()
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metrics.inc "editor.get-connected-users"
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{project_id, user_id, is_restricted_user} = client.ol_context
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if is_restricted_user
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return callback(null, [])
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return callback(new Error("no project_id found on client")) if !project_id?
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logger.log {user_id, project_id, client_id: client.id}, "getting connected users"
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AuthorizationManager.assertClientCanViewProject client, (error) ->
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return callback(error) if error?
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WebsocketLoadBalancer.emitToRoom project_id, 'clientTracking.refresh'
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setTimeout () ->
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ConnectedUsersManager.getConnectedUsers project_id, (error, users) ->
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return callback(error) if error?
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callback null, users
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logger.log {user_id, project_id, client_id: client.id}, "got connected users"
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, WebsocketController.CLIENT_REFRESH_DELAY
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applyOtUpdate: (client, doc_id, update, callback = (error) ->) ->
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# client may have disconnected, but we can submit their update to doc-updater anyways.
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{user_id, project_id} = client.ol_context
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return callback(new Error("no project_id found on client")) if !project_id?
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WebsocketController._assertClientCanApplyUpdate client, doc_id, update, (error) ->
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if error?
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logger.warn {err: error, doc_id, client_id: client.id, version: update.v}, "client is not authorized to make update"
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setTimeout () ->
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# Disconnect, but give the client the chance to receive the error
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client.disconnect()
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, 100
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return callback(error)
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update.meta ||= {}
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update.meta.source = client.publicId
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update.meta.user_id = user_id
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metrics.inc "editor.doc-update", 0.3
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logger.log {user_id, doc_id, project_id, client_id: client.id, version: update.v}, "sending update to doc updater"
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DocumentUpdaterManager.queueChange project_id, doc_id, update, (error) ->
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if error?.message == "update is too large"
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metrics.inc "update_too_large"
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updateSize = error.updateSize
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logger.warn({user_id, project_id, doc_id, updateSize}, "update is too large")
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# mark the update as received -- the client should not send it again!
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callback()
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# trigger an out-of-sync error
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message = {project_id, doc_id, error: "update is too large"}
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setTimeout () ->
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if client.disconnected
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# skip the message broadcast, the client has moved on
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return metrics.inc('editor.doc-update.disconnected', 1, {status:'at-otUpdateError'})
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client.emit "otUpdateError", message.error, message
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client.disconnect()
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, 100
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return
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if error?
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logger.error {err: error, project_id, doc_id, client_id: client.id, version: update.v}, "document was not available for update"
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client.disconnect()
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callback(error)
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_assertClientCanApplyUpdate: (client, doc_id, update, callback) ->
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AuthorizationManager.assertClientCanEditProjectAndDoc client, doc_id, (error) ->
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if error?
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if error.message == "not authorized" and WebsocketController._isCommentUpdate(update)
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# This might be a comment op, which we only need read-only priveleges for
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AuthorizationManager.assertClientCanViewProjectAndDoc client, doc_id, callback
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else
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return callback(error)
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else
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return callback(null)
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_isCommentUpdate: (update) ->
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for op in update.op
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if !op.c?
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return false
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return true
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