OpenGraphNet

A simple .net assembly to use to parse Open Graph information from either a URL or an HTML snippet. You can read more about the
Open Graph protocol @ http://ogp.me.

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Usage

These are the basic operations of the OpenGraphNet parser.

Parsing from a URL

Use async/await to parse a URL:

csharp
OpenGraph graph = await OpenGraph.ParseUrlAsync("https://open.spotify.com/user/er811nzvdw2cy2qgkrlei9sqe/playlist/2lzTTRqhYS6AkHPIvdX9u3?si=KcZxfwiIR7OBPCzj20utaQ");

Accessing Values

Accessing Metadata

Each metadata element is stored as an array. Additionally, each element's properties are also stored as an array.

html
<meta property="og:image" content="http://example.com/img1.png">
<meta property="og:image:width" content="30">
<meta property="og:image" content="http://example.com/img2.png">
<meta property="og:image:width" content="60">
<meta property="og:locale" content="en">
<meta property="og:locale:alternate" content="en_US">
<meta property="og:locale:alternate" content="en_GB">

You would access the values from the sample HTML above as:

csharp
graph.Metadata["og:image"].First().Value; // "http://example.com/img1.png"
graph.Metadata["og:image"].First().Properties["width"].Value(); // "30"
graph.Metadata["og:image"][1].Value; // "http://example.com/img2.png"
graph.Metadata["og:image"][1].Properties["width"].Value(); // "30"
graph.Metadata["og:locale"].Value(); // "en"
graph.Metadata["og:locale"].First().Properties["alternate"][0].Value; // "en_US"
graph.Metadata["og:locale"].First().Properties["alternate"][1].Value; // "en_GB"

Basic Metadata

The four required Open Graph properties for all pages are available as direct properties on the OpenGraph object.

graph.Type is a shortcut for graph.Metadata["og:type"].Value()
graph.Title is a shortcut for graph.Metadata["og:title"].Value()
graph.Image is a shortcut for graph.Metadata["og:image"].Value()
Note: since there can be multiple images, this helper returns the URI of the
first image. If you want to access images or child properties like og:image:width then you
should instead use the graph.Metadata dictionary.*
graph.Url is a shortcut for graph.Metadata["og:url"].Value()

Misc

The original URL used to generate the OpenGraph data is available from the OriginalUrl property
graph.OriginalUrl.

Creating OpenGraph Data

To create OpenGraph data in memory use the following code:

csharp
var graph = OpenGraph.MakeGraph(
    title: "My Title", 
    type: "website", 
    image: "http://example.com/img/img1.png", 
    url: "http://example.com/home", 
    description: "My Description", 
    siteName: "Example.com");
graph.AddMetadata("og", "image", "http://example.com/img/img2.png");
graph.Metadata["og:image"][0].AddProperty("width", "30");
graph.Metadata["og:image"][1].AddProperty("width", "60");
System.Console.Write(graph.ToString());

The previous System.Console.Write(graph.ToString()); will produce the following HTML (formatting added for legibility):

html
<meta property="og:title" content="My Title">
<meta property="og:type" content="website">
<meta property="og:image" content="http://example.com/img/img1.png">
<meta property="og:image:width" content="30">
<meta property="og:image" content="http://example.com/img/img2.png">
<meta property="og:image:width" content="60">
<meta property="og:url" content="http://example.com/home">
<meta property="og:description" content="My Description">
<meta property="og:site_name" content="Example.com">

Parsing Namespaces

The component now knows about the 13 namespaces listed below. When parsing a url or a HTML
document, OpenGraph.Net will now read and use those namespaces from either the <html> or
<head> tags. The parser is now smart enough to include the namespaces when none are
included in those tags by extracting it from the meta[property] value directly.

og: http://ogp.me/ns#
- Expected fields when validating: title, type, image, url
article: http://ogp.me/ns/article#
book: http://ogp.me/ns/book#
books: http://ogp.me/ns/books#
business http://ogp.me/ns/business#
fitness: http://ogp.me/ns/fitness#
game: http://ogp.me/ns/game#
music: http://ogp.me/ns/music#
place: http://ogp.me/ns/place#
product: http://ogp.me/ns/product#
profile: http://ogp.me/ns/profile#
restaurant: http://ogp.me/ns/restaurant#
video: http://ogp.me/ns/video#"

If there are any additional standard/supported namespaces that I am missing, please shoot me
a comment or a pull request with the missing items.

Adding Custom Namespaces

You can now add custom namespaces to the parser. Simply make the following call:

csharp
NamespaceRegistry.Instance.AddNamespace(
    prefix: "gah",
    schemaUri: "http://wwww.geoffhorsey.com/ogp/brain#",
    requiredElements: new[] { "brain" });

Doing the above will allow the parser to understand the following HTML snippet:

html
<meta property="gah:brain" content="http://www.geoffhorsey.com/my-brain">
<meta property="gah:brain:size" content="tiny">

and the graph:

csharp
graph.Metadata["gah:brain"].Value() // "http://www.geoffhorsey.com/my-brain"
graph.Metadata["gah:brain"].First().Properties["size"].Value() // "tiny"

Writing out OpenGraph Namespaces

In the wild web sites seem to add their OpenGraph namespaces in one of 2 ways. They either
write the namespaces in the html as xmlns attributes or within the head tag in the prefix attribute.

<html xmlns:og="http://ogp.me/ns#" xmlns:product="http://ogp.me/ns/product#">
<head prefix="og: http://ogp.me/ns# product: http://ogp.me/ns/product#">

xmlns: version in the html tag

To create the html version in an cshtml page after creating a new graph, use the following code:

html
<html @graph.HtmlXmlnsValues>

Would produce the following:

html
<html xmlns:og="http://ogp.me/ns#" xmlns:product="http://ogp.me/ns/product#">

`prefix` version in the `<head>` tag

To create the head version in a cshtml page, after create a new graph, use the following code:

html
<head prefix="@graph.HeadPrefixAttributeValue">

Would produce the following:

html
<head prefix="og: http://ogp.me/ns# product: http://ogp.me/ns/product#">

Writing out OpenGraph Metadata to the `head` tag

Below is a complete example to write out a OpenGraph metadata to a page:

html
@{
    var graph = OpenGraph.MakeGraph(
        title: "My Title", 
        type: "website", 
        image: "http://example.com/img/img1.png", 
        url: "http://example.com/home", 
        description: "My Description", 
        siteName: "Example.com");
}
<html>
<head prefix="@graph.HeadPrefixAttributeValue">
    @graph.ToString()
</head>
<body>
    <!-- Your awesome page! -->
</body>
</html>

will produce the following HTML:

html
<html>
<head prefix="og: http://ogp.me/ns#">
    <meta property="og:title" content="My Title">
    <meta property="og:type" content="website">
    <meta property="og:image" content="http://example.com/img/img1.png">
    <meta property="og:url" content="http://example.com/home">
    <meta property="og:description" content="My Description">
    <meta property="og:site_name" content="Example.com">
</head>
<body>
    <!-- Your awesome page! -->
</body>
</html>

It's FOSS

So please don't be afraid to fork me.

Contribution Guide

Fork the OpenGraph-Net repository
Create a feature branch for the item you are going to add.
Add your awesome code and your unit tests to cover the new feature
Run all of the tests to ensure everything is still passing.
Create a pull request to our develop branch.

Contributors ✨

Thanks goes to these wonderful people (emoji key):

<table> <tr> <td align="center"><a href="http://www.geoffhorsey.com/"><img src="https://avatars.githubusercontent.com/u/448706?v=4?s=100" width="100px;" alt=""/> Geoff</a> <a href="https://github.com/ghorsey/OpenGraph-Net/commits?author=ghorsey" title="Code">💻</a> <a href="https://github.com/ghorsey/OpenGraph-Net/commits?author=ghorsey" title="Documentation">📖</a> <a href="#ideas-ghorsey" title="Ideas, Planning, & Feedback">🤔</a> <a href="#platform-ghorsey" title="Packaging/porting to new platform">📦</a> <a href="#projectManagement-ghorsey" title="Project Management">📆</a> <a href="https://github.com/ghorsey/OpenGraph-Net/commits?author=ghorsey" title="Tests">⚠️</a></td> <td align="center"><a href="https://osbeck.com/"><img src="https://avatars.githubusercontent.com/u/982752?v=4?s=100" width="100px;" alt=""/> Per Osbäck</a> <a href="https://github.com/ghorsey/OpenGraph-Net/commits?author=perosb" title="Code">💻</a></td> </tr> </table>

This project follows the all-contributors specification. Contributions of any kind welcome!