Facebook sharing: going from 'feed' to 'share_open_graph' - facebook

Question

I'm messing around with an Angular app, let's say for the sake of argument that I'm not using any meta tags, how can I use the Share Dialog to let users share pages of my app?
Using the old Feed Dialog works, but it has been deprecated:
$scope.share = function() {
FB.ui({
method: 'feed',
name: 'This is the name field',
link: 'The link',
picture: 'The picture',
caption: 'The caption',
description: 'This is the content of the "description" field, below the caption.'
})
},
function(response) {
if (response && !response.error_code) {
console.log('Posting completed.');
} else {
console.log('Error while posting.');
}
});
};
So even though this works, I want to use the Share Diolog in the same way but I'm not figuring it out. This is sort of what I've been trying, keep in mind that I'm a newbie:
$scope.share = function() {
FB.ui({
method: 'share_open_graph',
action_type: 'og.likes',
action_properties: JSON.stringify({
object: {
'title': 'The title',
'image': 'An image',
'url': $scope.shareUrl,
'description': 'This is the description',
}
})
},
function(response) {
if (response && !response.error_code) {
console.log('Posting completed.');
} else {
console.log('Error while posting.');
}
});
};
Any hints?

Answer 1

The short answer is that you can't, you must use OpenGraph meta tags.
Since Facebook doesn't understand JavaScript and thus Angular, you must detect Facebook's crawlers server-side and render a static page for them instead of the Angular app.
While the precise implementation will vary depending on your server technologies, here's the general idea:
Setup a route for the resources that need sharing: http://example.com/resources/:id
Look for the user-agent
If it's one of Facebook's crawlers, fetch the resource and render a simple view with OpenGraph tags and an empty body. Otherwise, simply render the Angular app.
Facebook's crawlers are available here and they currently are:
facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)
facebookexternalhit/1.1
Facebot