deathau.weblog.lol/weblog/B0. Template/fediverse.js.md

/*/
Type: file
Content-Type: application/javascript
Title: Fediverse script
Location: /fediverse.js
/**/

const SUBSCRIBE_LINK_REL = 'http://ostatus.org/schema/1.0/subscribe'
function share(uri, handle) {
  if(!handle){
    handle = prompt("Please enter your fediverse / mastodon handle (e.g. '@user@domain.social')\n(remember to look for blocked pop-ups)", "@")
  }
  
  if(handle) {
    const input = handle
    handle = handle.trim().replace(/^@/,'')
    const split = handle.split('@')
    if(split.length == 2) {
      const resource = `acct:${handle}`
      const domain = split[1]
      
      // look up remote user via webfinger
      const url = `https://${domain}/.well-known/webfinger?resource=${resource}`
      fetch(url, {headers: {
        'Content-Type': 'application/activity+json'
      }}).then(async result => {
        const json = await result.json()
        const subscribe = json.links.find(link => link.rel && link.rel == SUBSCRIBE_LINK_REL)
        let template = subscribe.template
        window.open(template.replace("{uri}", uri), '_blank').focus()
      })
      .catch(e => {
        console.error(e)
        throw `Sorry, we couldn't find an uri for ${input}.\n\nTry searching for "${uri}" on ${domain} (or in your fediverse client of choice)`
      })
      
    }
    else {
      throw 'Please enter your fediverse address in @user@domain.social format'
    }
  }
}

function fediverse() {
	document.querySelectorAll("a.external_url:not([href='{external_url}'])").forEach(el => {
		el.addEventListener('click', e => {
			e.preventDefault()
			share(el.href)
		})
	})
}