Create method to load url and extract headers and meta tags

packages/rocketchat-oembed/package.js

@@ -15,6 +15,7 @@ Package.onUse(function(api) {
 	]);
 
 	api.addFiles('oembed.coffee', ['server','client']);
+	api.addFiles('server.coffee', ['server']);
 });
 
 Package.onTest(function(api) {

packages/rocketchat-oembed/server.coffee

+URL = Npm.require('url')
+http = Npm.require('http')
+https = Npm.require('https')
+querystring = Npm.require('querystring')
+
+getUrlContent = (urlObj, redirectCount = 5, callback) ->
+	opts =
+		method: 'GET'
+		port: urlObj.port
+		hostname: urlObj.hostname
+		path: urlObj.path
+
+	httpOrHttps = if urlObj.protocol is 'https:' then https else http
+
+	request = httpOrHttps.request opts, (response) ->
+		if response.statusCode is 301 and response.headers.location?
+			request.abort()
+			console.log response.headers.location
+
+			if redirectCount <= 0
+				return callback null, null
+
+			getUrlContent response.headers.location, --redirectCount, callback
+			return
+
+		if response.statusCode isnt 200
+			return callback null, null
+
+		str = ''
+		response.on 'data', (chunk) ->
+			str += chunk
+			if str.length > 250000
+				request.abort()
+
+		response.on 'end', ->
+			callback null, {
+				headers: response.headers
+				body: str
+			}
+
+	request.end()
+
+getUrlMeta = (url, withFragment) ->
+	getUrlContentSync = Meteor.wrapAsync getUrlContent
+
+	urlObj = URL.parse url
+
+	if withFragment?
+		queryStringObj = querystring.parse urlObj.query
+		queryStringObj._escaped_fragment_ = ''
+		urlObj.query = querystring.stringify queryStringObj
+
+		path = urlObj.pathname
+		if urlObj.query?
+			path += '?' + urlObj.query
+
+		urlObj.path = path
+
+	content = getUrlContentSync urlObj, 5
+
+	metas = {}
+
+	content?.body.replace /<meta.*(?:name|property)=['"]([^'"]*)['"].*content=['"]([^'"]*)['"].*>/gmi, (meta, name, value) ->
+		metas[name] = value
+
+	return {
+		meta: metas
+		headers: content?.headers
+	}
+
+
+Meteor.methods
+	getUrlMeta: (url) ->
+		data = getUrlMeta url
+
+		if data.meta.fragment is '!'
+			data = getUrlMeta url, true
+
+		console.log data.meta
+		console.log data.headers
+
+		return data
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