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icon
Ocarina

Build Status Contact License: MIT

A library to receive metadata and Open Graph information from URLs.

Introduction

Hi, we're Awkward. We were looking for a way to visualize information behind links to present these in our iOS reddit client called Beam. We initially used a server to receive metadata, but the server became quite crowded with calls. We built Ocarina as a solution to that problem. Fallbacks for basic HTML tags and Twitter card information make this metadata fetcher unique. We welcome you to use Ocarina for your own projects.

Features

  • Fetching of basic metadata for individual links using the OGP protocol or basic HTML tags (twitter card information also available)
  • Memory cache of metadata for each link
  • Prefetching a set of links to make views more responsive
  • Link information can include: type, title, description, image, image size, favicon, and Apple touch icon

Installation

  1. Drag Ocarina.xcodeproj into your project
  2. Go to your project
  3. Select General
  4. Under "Frameworks, Libraries, and Embedded Content" press + and select Ocarina.framework
  5. Select Build Settings
  6. Search for Other Linker Flags and add -lxml2 (Make sure you click "All" at the top instead of "Basic" to see Other Linker Flags)

Usage

Fetching information for a single link

let url = URL(string: "https://awkward.co")!
url.oca.fetchInformation(completionHandler: { (information, error) in
  if let information = information {
    print(String(describing: information.title))
  } else if let error = error {
    print(String(describing: error))
  }

})

Prefetching multiple links

OcarinaPrefetcher allows prefetching links into the cache, this allows for the UI to look more responsive.

let urls = [
  URL(string: "https://awkward.co")!,
  URL(string: "https://facebook.com")!,
  URL(string: "https://nytimes.com")!,
  URL(string: "https://latimes.com")!
]
let prefetcher = OcarinaPrefetcher(urls: urls, completionHandler: { (errors) in§
  print("Done pre-fetching links")
})

For other uses, see the example project

Contributing

Contributing is easy. If you want to report an error of any kind, please create an issue. If you want to propose a change, a pull request is the right way to go.

License

Ocarina is available under the MIT license. See the LICENSE file for more info.

Links