manifold/web/components/SEO.tsx

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import Head from 'next/head'
export type OgCardProps = {
question: string
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probability?: string
metadata: string
creatorName: string
creatorUsername: string
creatorAvatarUrl: string
}
function buildCardUrl(props: OgCardProps) {
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const probabilityParam =
props.probability === undefined
? ''
: `&probability=${encodeURIComponent(props.probability ?? '')}`
// URL encode each of the props, then add them as query params
return (
`https://manifold-og-image.vercel.app/m.png` +
`?question=${encodeURIComponent(props.question)}` +
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probabilityParam +
`&metadata=${encodeURIComponent(props.metadata)}` +
`&creatorName=${encodeURIComponent(props.creatorName)}` +
`&creatorAvatarUrl=${encodeURIComponent(props.creatorAvatarUrl)}` +
`&creatorUsername=${encodeURIComponent(props.creatorUsername)}`
)
}
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export function SEO(props: {
title: string
description: string
url?: string
children?: any[]
ogCardProps?: OgCardProps
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}) {
const { title, description, url, children, ogCardProps } = props
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return (
<Head>
<title>{title} | Manifold Markets</title>
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<meta
property="og:title"
name="twitter:title"
content={title}
key="title"
/>
<meta name="description" content={description} key="description1" />
<meta
property="og:description"
name="twitter:description"
content={description}
key="description2"
/>
{url && (
<meta
property="og:url"
content={'https://manifold.markets' + url}
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key="url"
/>
)}
{ogCardProps && (
<>
<meta
property="og:image"
content={buildCardUrl(ogCardProps)}
key="image1"
/>
<meta name="twitter:card" content="summary_large_image" key="card" />
<meta
name="twitter:image"
content={buildCardUrl(ogCardProps)}
key="image2"
/>
</>
)}
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{children}
</Head>
)
}