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| // @flow | |
| const debug = require('debug')('api:thread-message-connection'); | |
| import type { DBThread } from 'shared/types'; | |
| import type { PaginationOptions } from '../../utils/paginate-arrays'; | |
| import UserError from '../../utils/UserError'; | |
| import { encode, decode } from '../../utils/base64'; | |
| import { getMessages } from '../../models/message'; | |
| export default ( | |
| { id }: DBThread, | |
| { | |
| first, | |
| after, | |
| last, | |
| before, | |
| }: { ...PaginationOptions, last: number, before: string } | |
| ) => { | |
| // Make sure users don't provide bonkers arguments that paginate in both directions at the same time | |
| if ( | |
| (first && last) || | |
| (after && before) || | |
| (first && before) || | |
| (after && last) | |
| ) { | |
| debug('invalid pagination options provided:'); | |
| debug( | |
| 'first:', | |
| first, | |
| ' last:', | |
| last, | |
| ' after:', | |
| after, | |
| ' before:', | |
| before | |
| ); | |
| return new UserError( | |
| 'Cannot paginate back- and forwards at the same time. Please only ask for the first messages after a certain point or the last messages before a certain point.' | |
| ); | |
| } | |
| debug(`get messages for ${id}`); | |
| let cursor = after || before; | |
| try { | |
| cursor = decode(cursor); | |
| if (cursor) cursor = parseInt(cursor, 10); | |
| } catch (err) { | |
| console.error('❌ Error in job:\n'); | |
| console.error(err); | |
| return new UserError('Invalid cursor passed to thread.messageConnection.'); | |
| } | |
| if (cursor) debug(`cursor: ${cursor}`); | |
| let options = { | |
| // Default first/last to 25 if their counterparts after/before are provided | |
| // so users can query messageConnection(after: "cursor") or (before: "cursor") | |
| // without any more options | |
| first: first ? first : after ? 25 : null, | |
| last: last ? last : before ? 25 : null, | |
| // Set after/before to the cursor depending on which one was requested by the user | |
| after: after ? cursor : null, | |
| before: before ? cursor : null, | |
| }; | |
| // If we didn't get any arguments at all (i.e messageConnection {}) | |
| // then just fetch the first 25 messages | |
| // $FlowIssue | |
| if (Object.keys(options).every(key => !options[key])) { | |
| options = { | |
| first: 25, | |
| }; | |
| } | |
| debug('pagination options for query:', options); | |
| // Load one message too much so that we know whether there's | |
| // a next or previous page | |
| options.first && options.first++; | |
| options.last && options.last++; | |
| return getMessages(id, options).then(result => { | |
| let messages = result; | |
| // Check if more messages were returned than were requested, which would mean | |
| // there's a next/previous page. (depending on the direction of the pagination) | |
| const loadedMoreFirst = options.first && result.length > options.first - 1; | |
| const loadedMoreLast = options.last && result.length > options.last - 1; | |
| // Get rid of the extranous message if there is one | |
| if (loadedMoreFirst) { | |
| debug('not sending extranous message loaded first'); | |
| messages = result.slice(0, result.length - 1); | |
| } else if (loadedMoreLast) { | |
| debug('not sending extranous message loaded last'); | |
| messages = result.reverse().slice(1, result.length); | |
| } | |
| return { | |
| pageInfo: { | |
| // Use the extranous message that was maybe loaded to figure out whether | |
| // there is a next/previous page, otherwise just try and guess based on | |
| // if a cursor was provided | |
| // $FlowIssue | |
| hasNextPage: loadedMoreFirst || !!options.before, | |
| // $FlowIssue | |
| hasPreviousPage: loadedMoreLast || !!options.after, | |
| }, | |
| edges: messages.map(message => ({ | |
| cursor: encode(message.timestamp.getTime().toString()), | |
| node: message, | |
| })), | |
| }; | |
| }); | |
| }; | |