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93b261c Added backend events API
36b5791 polished code
911b8f7 Test deployment for QA site (#57)
Domin0de1f2ba56 [I2-17] Added backend events API (#53)
somereticald66cf73 Fix to read fetched events data correctly
Domin0def00dc3c Merge branch 'qa' into I2-17/events-api
Domin0de49600e0 Minor Fix for Event Data Fetching (#60)
Domin0ded6aa8df Update eventInfo properly
somereticale3177d1 Update event fetching error handling
somereticaldb7065c fix type error
somereticalace1472 fix event concat
somereticalb71a229 Merge branch 'qa' into I2-17/events-api
Domin0de9da3ad7 Update index.ts
someretical20ee093 add missing async
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2 changes: 2 additions & 0 deletions.github/workflows/ci.yml
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -4,10 +4,12 @@ on: | ||
| push: | ||
| branches: | ||
| - master | ||
| - qa | ||
| - renovate/* | ||
| pull_request: | ||
| branches: | ||
| - master | ||
| - qa | ||
| jobs: | ||
| api-ci: | ||
33 changes: 23 additions & 10 deletions.github/workflows/docker.yml
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2 changes: 2 additions & 0 deletions.gitignore
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -35,3 +35,5 @@ yarn-error.log* | ||
| # typescript | ||
| *.tsbuildinfo | ||
| next-env.d.ts | ||
| *.env | ||
14 changes: 14 additions & 0 deletionsbackend/package-lock.json
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1 change: 1 addition & 0 deletionsbackend/package.json
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6 changes: 6 additions & 0 deletionsbackend/src/controllers/events.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| import { RequestHandler } from "express"; | ||
| import { eventInfo } from "../data/eventData"; | ||
| export const EventsHandler: RequestHandler = (req, res) => { | ||
| res.status(200).json(eventInfo); | ||
| } |
137 changes: 137 additions & 0 deletionsbackend/src/controllers/eventsWebhook.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,137 @@ | ||
| import crypto from "crypto"; | ||
| import { RequestHandler } from "express"; | ||
| import { eventInfo, eventInfoMutex, fetchEvent } from "../data/eventData"; | ||
| import { filterInPlace, replaceInPlace } from "../util"; | ||
| interface FacebookWebhookPayload { | ||
| object: string; | ||
| entry: Array<{ | ||
| id: string; | ||
| changes: Array<{ | ||
| field: string; | ||
| value: { | ||
| event_id: string; | ||
| item: string; | ||
| verb: string; | ||
| }; | ||
| }>; | ||
| }>; | ||
| } | ||
| const verifySignature = ( | ||
| rawBody: Buffer, | ||
| signatureHeader?: string | ||
| ): boolean => { | ||
| if (!signatureHeader) return false; | ||
| const [algo, signature] = signatureHeader.split("="); | ||
| if (algo !== "sha256") return false; | ||
| const expected = crypto | ||
| .createHmac("sha256", process.env.FB_APP_SECRET as string) | ||
| .update(rawBody) | ||
| .digest("hex"); | ||
| return crypto.timingSafeEqual(Buffer.from(signature), Buffer.from(expected)); | ||
| }; | ||
| export const EventsWebhookVerifier: RequestHandler = (req, res) => { | ||
| const mode = req.query["hub.mode"]; | ||
| const token = req.query["hub.verify_token"]; | ||
| const challenge = req.query["hub.challenge"]; | ||
| if (mode === "subscribe" && token === process.env.FB_WEBHOOK_VERIFY_TOKEN) { | ||
| return res.status(200).send(challenge); | ||
| } | ||
| res.sendStatus(403); | ||
| }; | ||
| /* | ||
| Sample webhook payload | ||
| https://developers.facebook.com/docs/graph-api/webhooks/getting-started/webhooks-for-pages -- for the outer wrapper | ||
| https://developers.facebook.com/docs/graph-api/webhooks/reference/page/#feed -- for the inner objects | ||
| { | ||
| "object": "page", | ||
| "entry": [ | ||
| { | ||
| "id": "PAGE_ID", | ||
| "time": 1623242342342, | ||
| "changes": [ | ||
| { | ||
| "field": "events", | ||
| "value": { | ||
| "event_id": "123456789", | ||
| "verb": "create", // also "edit" or "delete" | ||
| "published": 1 | ||
| } | ||
| } | ||
| ] | ||
| } | ||
| ] | ||
| } | ||
| */ | ||
| export const EventsWebhookUpdate: RequestHandler = async (req, res) => { | ||
| const signature = req.headers["x-hub-signature-256"]; | ||
| if ( | ||
| !req.rawBody || | ||
| typeof signature !== "string" || | ||
| !verifySignature(req.rawBody, signature) | ||
| ) { | ||
| return res.sendStatus(401); | ||
| } | ||
| const notif: FacebookWebhookPayload = req.body; | ||
| if ( | ||
| !notif || | ||
| !notif.entry || | ||
| notif.object !== "page" || | ||
| notif.entry.length === 0 | ||
| ) { | ||
| return res.sendStatus(400); | ||
| } | ||
| for (const entry of notif.entry) { | ||
| if (entry.id !== process.env.FB_EVENT_PAGE_ID) continue; | ||
| for (const change of entry.changes) { | ||
| if (change.field !== "feed" || change.value.item !== "event") continue; | ||
| try { | ||
| if (change.value.verb === "delete") { | ||
| await eventInfoMutex.runExclusive(() => | ||
| filterInPlace(eventInfo, (val) => val.id !== change.value.event_id) | ||
| ); | ||
| console.log(`Deleted event: ${change.value.event_id}`); | ||
| } else if (change.value.verb === "edit") { | ||
| const newEvent = await fetchEvent(change.value.event_id); | ||
| eventInfoMutex.runExclusive(() => | ||
| replaceInPlace( | ||
| eventInfo, | ||
| (val) => val.id === change.value.event_id, | ||
| newEvent | ||
| ) | ||
| ); | ||
| console.log(`Edited event: ${change.value.event_id}`); | ||
| } else if (change.value.verb === "add") { | ||
| const newEvent = await fetchEvent(change.value.event_id); | ||
| await eventInfoMutex.runExclusive(() => eventInfo.push(newEvent)); | ||
| console.log(`Added event: ${change.value.event_id}`); | ||
| } else { | ||
| console.warn( | ||
| `Unknown verb "${change.value.verb}" for event ${change.value.event_id}` | ||
| ); | ||
| } | ||
| } catch (err) { | ||
| console.error( | ||
| `Error processing event: ${change.value.event_id}:\n${err}` | ||
| ); | ||
| return res.sendStatus(500); | ||
| } | ||
| } | ||
| } | ||
| res.sendStatus(200); | ||
| }; |
101 changes: 101 additions & 0 deletionsbackend/src/data/eventData.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| import { Mutex } from "async-mutex"; | ||
| import { inspect } from "util"; | ||
| import { FacebookError, Result, ResultType } from "../util"; | ||
| class EventInfo { | ||
| // god forbid a class have public members | ||
| public id: string; | ||
| public title: string; | ||
| public startTime: string; | ||
| public endTime?: string; | ||
| public location: string; | ||
| public imageUrl: string; | ||
| public link: string; | ||
| constructor( | ||
| id: string, | ||
| title: string, | ||
| startTime: string, | ||
| endTime: string | undefined, | ||
| location: string, | ||
| imageUrl: string | ||
| ) { | ||
| this.id = id; | ||
| this.title = title; | ||
| this.startTime = startTime; | ||
| this.endTime = endTime; | ||
| this.location = location; | ||
| this.imageUrl = imageUrl; | ||
| // would use link as getter but getters are not enumerable so it doesn't appear in JSON.stringify :skull: | ||
| // maybe a cursed fix would be to use Object.defineProperty LOL | ||
| this.link = `https://www.facebook.com/events/${id}`; | ||
| } | ||
| } | ||
| interface FacebookEvent { | ||
| id: string; | ||
| name: string; | ||
| cover?: { source: string }; | ||
| place?: { name: string }; | ||
| start_time: string; | ||
| end_time?: string; | ||
| } | ||
| interface FacebookEventsResponse { | ||
| data: FacebookEvent[]; | ||
| } | ||
| // this isn't in .env for different module compatiblity | ||
| const FB_API_VERSION = "v23.0"; | ||
| const DEFAULT_EVENT_LOCATION = "Everything everywhere all at once!!!"; | ||
| const DEFAULT_EVENT_IMAGE = "/images/events/default_event.jpg"; | ||
| // we LOVE global variables | ||
| export const eventInfoMutex = new Mutex(); | ||
| export const eventInfo: EventInfo[] = []; | ||
| export async function fetchEvents() { | ||
| const response = await fetch( | ||
| `https://graph.facebook.com/${FB_API_VERSION}/${process.env.FB_EVENT_PAGE_ID}/events?access_token=${process.env.FB_ACCESS_TOKEN}&fields=id,name,cover,place,start_time,end_time` | ||
| ); | ||
| if (!response.ok) { | ||
| throw new Error(JSON.stringify(response.json())); | ||
| } | ||
| const res: FacebookEventsResponse = await response.json(); | ||
| const processed = res.data.map( | ||
| (e) => | ||
| new EventInfo( | ||
| e.id, | ||
| e.name, | ||
| e.start_time, | ||
| e.end_time, | ||
| e.place?.name ?? DEFAULT_EVENT_LOCATION, | ||
| e.cover?.source ?? DEFAULT_EVENT_IMAGE | ||
| ) | ||
| ); | ||
| return processed; | ||
| } | ||
| export async function fetchEvent(id: string) { | ||
| const response = await fetch( | ||
| `https://graph.facebook.com/${FB_API_VERSION}/${id}?access_token=${process.env.FB_ACCESS_TOKEN}&fields=id,name,cover,place,start_time,end_time` | ||
| ); | ||
| if (!response.ok) { | ||
| throw new Error(`Couldn't fetch details for event ${id}\n${JSON.stringify(response.json())}`); | ||
| } | ||
| const res: FacebookEvent = await response.json(); | ||
| return new EventInfo( | ||
| res.id, | ||
| res.name, | ||
| res.start_time, | ||
| res.end_time, | ||
| res.place?.name ?? DEFAULT_EVENT_LOCATION, | ||
| res.cover?.source ?? DEFAULT_EVENT_IMAGE | ||
| ); | ||
| } |
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