manifold/og-image/api/_lib/parser.ts

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import { IncomingMessage } from 'http'
import { parse } from 'url'
import { ParsedRequest } from './types'
export function parseRequest(req: IncomingMessage) {
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console.log('HTTP ' + req.url)
const { pathname, query } = parse(req.url || '/', true)
const {
fontSize,
images,
widths,
heights,
theme,
md,
// Attributes for Manifold card:
question,
probability,
metadata,
creatorName,
creatorUsername,
creatorAvatarUrl,
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} = query || {}
if (Array.isArray(fontSize)) {
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throw new Error('Expected a single fontSize')
}
if (Array.isArray(theme)) {
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throw new Error('Expected a single theme')
}
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const arr = (pathname || '/').slice(1).split('.')
let extension = ''
let text = ''
if (arr.length === 0) {
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text = ''
} else if (arr.length === 1) {
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text = arr[0]
} else {
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extension = arr.pop() as string
text = arr.join('.')
}
// Take a url query param and return a single string
const getString = (stringOrArray: string[] | string | undefined): string => {
if (Array.isArray(stringOrArray)) {
// If the query param is an array, return the first element
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return stringOrArray[0]
}
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return stringOrArray || ''
}
const parsedRequest: ParsedRequest = {
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fileType: extension === 'jpeg' ? extension : 'png',
text: decodeURIComponent(text),
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theme: theme === 'dark' ? 'dark' : 'light',
md: md === '1' || md === 'true',
fontSize: fontSize || '96px',
images: getArray(images),
widths: getArray(widths),
heights: getArray(heights),
question:
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getString(question) || 'Will you create a prediction market on Manifold?',
probability: getString(probability),
metadata: getString(metadata) || 'Jan 1  •  M$ 123 pool',
creatorName: getString(creatorName) || 'Manifold Markets',
creatorUsername: getString(creatorUsername) || 'ManifoldMarkets',
creatorAvatarUrl: getString(creatorAvatarUrl) || '',
}
parsedRequest.images = getDefaultImages(parsedRequest.images)
return parsedRequest
}
function getArray(stringOrArray: string[] | string | undefined): string[] {
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if (typeof stringOrArray === 'undefined') {
return []
} else if (Array.isArray(stringOrArray)) {
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return stringOrArray
} else {
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return [stringOrArray]
}
}
function getDefaultImages(images: string[]): string[] {
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const defaultImage = 'https://manifold.markets/logo.png'
if (!images || !images[0]) {
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return [defaultImage]
}
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return images
}