overleaf/services/web/app/views/_metadata.pug

//- Title
if (metadata && metadata.title)
	title= metadata.title + ' - ' + settings.appName + ', ' + translate("online_latex_editor")
	meta(name="twitter:title", content=metadata.title)
	meta(name="og:title", content=metadata.title)
else if (typeof(title) == "undefined")
	title= settings.appName + ', '+ translate("online_latex_editor")
	meta(name="twitter:title", content=settings.appName + ', '+ translate("online_latex_editor"))
	meta(name="og:title", content=settings.appName + ', '+ translate("online_latex_editor"))
else
	title= translate(title) + ' - ' + settings.appName + ', ' + translate("online_latex_editor")
	//- to do - not translate?
	meta(name="twitter:title", content=translate(title))
	meta(name="og:title", content=translate(title))

//- Description
if (metadata && metadata.description)
	meta(name="description" , content=metadata.description)
	meta(itemprop="description" , content=metadata.description)
	//-twitter and og descriptions handeled in their sections below
else
	meta(name="description", content=translate("site_description"))
	meta(itemprop="description", content=translate("site_description"))

//- Image
if (metadata && metadata.image && metadata.image.fields)
	//- from the CMS
	meta(itemprop="image", content=metadata.image.fields.file.url)
	meta(name="image", content=metadata.image.fields.file.url)
else if (metadata && metadata.image_src)
	//- pages with custom metadata images, metadata.image_src is the full image URL
	meta(itemprop="image", content=metadata.image_src)
	meta(name="image", content=metadata.image_src)
else if (settings.overleaf)
	//- the default image for Overleaf
	meta(itemprop="image", content=buildImgPath('ol-brand/overleaf_og_logo.png'))
	meta(name="image", content=buildImgPath('ol-brand/overleaf_og_logo.png'))
else
	//- the default image for ShareLaTeX
	meta(itemprop="image", content='/touch-icon-192x192.png')
	meta(name="image", content='/touch-icon-192x192.png')

//- Keywords
if (metadata && metadata.keywords)
	meta(name="keywords" content=metadata.keywords)

//- Misc
meta(itemprop="name", content=settings.appName + ", the Online LaTeX Editor")

if (metadata && metadata.robotsNoindexNofollow)
	meta(name="robots" content="noindex, nofollow")

//- Twitter
meta(name="twitter:card", content=metadata && metadata.twitterCardType ? metadata.twitterCardType : 'summary')
if (settings.social && settings.social.twitter && settings.social.twitter.handle)
	meta(name="twitter:site", content="@" + settings.social.twitter.handle)
if (metadata && metadata.twitterDescription)
	meta(name="twitter:description", content=metadata.twitterDescription)
else
	meta(name="twitter:description", content=translate("site_description"))
if (metadata && metadata.twitterImage && metadata.twitterImage.fields)
	//- from the CMS
	meta(name="twitter:image", content=metadata.twitterImage.fields.file.url)
	meta(name="twitter:image:alt", content=metadata.twitterImage.fields.title)
else if (settings.overleaf)
	//- the default image for Overleaf
	meta(name="twitter:image", content=buildImgPath('ol-brand/overleaf_og_logo.png'))
else
	//- the default image for ShareLaTeX
	meta(name="twitter:image", content='/touch-icon-192x192.png')

//- Open Graph
//- to do - add og:url
if (settings.social && settings.social.facebook && settings.social.facebook.appId)
	meta(property="fb:app_id", content=settings.social.facebook.appId)

if (metadata && metadata.openGraphDescription)
	meta(property="og:description", content=metadata.openGraphDescription)
else
	meta(property="og:description", content=translate("site_description"))

if (metadata && metadata.openGraphImage && metadata.openGraphImage.fields)
	//- from the CMS
	meta(property="og:image", content=metadata.openGraphImage.fields.file.url)
else if (settings.overleaf)
	//- the default image for Overleaf
	meta(property="og:image", content=buildImgPath('ol-brand/overleaf_og_logo.png'))
else
	//- the default image for ShareLaTeX
	meta(property="og:image", content='/touch-icon-192x192.png')

if (metadata && metadata.openGraphType)
	meta(property="og:type", metadata.openGraphType)
else
	meta(property="og:type", content="website")

if (metadata && metadata.openGraphVideo)
	//- from the CMS
	meta(property="og:video", content=metadata.openGraphVideo)

//- Viewport
if !metadata || metadata.viewport !== false
	meta(name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes")

//- Noindex
if settings.robotsNoindex
	meta(name="robots" content="noindex")

//- Apple devices
meta(name="apple-mobile-web-app-capable" content="yes")
meta(name="apple-mobile-web-app-status-bar-style" content="black-translucent")

//- Icons
link(rel="icon", href="/favicon.ico")
link(rel="icon", sizes="192x192", href="/touch-icon-192x192.png")
link(rel="apple-touch-icon-precomposed", href="/apple-touch-icon-precomposed.png")
link(rel="mask-icon", href="/mask-favicon.svg", color="#138A07")

//- Canonical Tag for SEO
if (metadata && metadata.canonicalURL)
	link(rel="canonical" href=metadata.canonicalURL)