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https://github.com/LeonardoCardoso/SwiftLinkPreview

It makes a preview from an URL, grabbing all the information such as title, relevant texts and images.
https://github.com/LeonardoCardoso/SwiftLinkPreview

carthage cocoapods crawler flow ios macos preview regular-expressions relevant-texts swift swift-package-manager tvos url watchos website

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It makes a preview from an URL, grabbing all the information such as title, relevant texts and images.

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README 

        
![Swift Link Preview](Images/badge.png)



**Link Previewer** for **iOS**, **macOS**, **watchOS** and **tvOS**



> It makes a preview from an URL, grabbing all the information such as title, relevant texts and images.



[![Platform](https://img.shields.io/badge/platform-iOS%20|%20macOS%20|%20watchOS%20|%20tvOS-orange.svg)](https://github.com/LeonardoCardoso/SwiftLinkPreview#requirements-and-details)

[![CocoaPods](https://img.shields.io/badge/pod-v3.4.0-red.svg)](https://github.com/LeonardoCardoso/SwiftLinkPreview#cocoapods)

[![Carthage Compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg)](https://github.com/LeonardoCardoso/SwiftLinkPreview#carthage)

[![Swift Package Manager](https://img.shields.io/badge/SPM-compatible-orange.svg)](https://github.com/LeonardoCardoso/SwiftLinkPreview#swift-package-manager)

[![Build Status](https://travis-ci.org/LeonardoCardoso/SwiftLinkPreview.svg?branch=master)](https://travis-ci.org/LeonardoCardoso/SwiftLinkPreview)



#### Index



* [Visual Examples](#visual-examples)

* [Requirements and Details](#requirements-and-details)

* [Installation](#installation)

	* [CocoaPods](#cocoapods)

	* [Carthage](#carthage)

	* [Swift Package Manager](#swift-package-manager)

	* [Manually](#manually)

* [Usage](#usage)

	* [Instatiating](#instatiating)

	* [Requesting preview](#requesting-preview)

	* [Cancelling a request](#cancelling-a-request)

* [Flow](#flow)

* [Important](#important)

* [Tips](#tips)

* [Information and Contact](#information-and-contact)

* [Related Projects](#related-projects)

* [License](#license)






## Visual Examples



**UTF-8** | **Extended UTF-8**	 | **Gallery**

:--:|:--:|:--:|

![UTF-8](Images/default.gif "UTF-8") | ![Extended UTF-8](Images/langs.gif "Extended UTF-8") |![Gallery](Images/gallery.gif "Gallery")

**Video Websites** | **Images**

![Video Websites](Images/videos.gif "Video Websites") | ![Images](Images/images.gif "Images") |



## Requirements and Details



* iOS 8.0+ / macOS 10.11+ / tvOS 9.0+ / watchOS 2.0+

* Xcode 8.0+

* Built with Swift 3



## Installation



### CocoaPods



To use **SwiftLinkPreview** as a pod package just add the following in your **Podfile** file.



```ruby

	source 'https://github.com/CocoaPods/Specs.git'

	platform :ios, '9.0'



	target 'Your Target Name' do

	  	use_frameworks!

	  	// ...

	  	pod 'SwiftLinkPreview', '~> 3.4.0'

	  	// ...

	end

```



### Carthage



To use **SwiftLinkPreview** as a Carthage module package just add the following in your **Cartfile** file.



```ruby

  	// ...

	github "LeonardoCardoso/SwiftLinkPreview" ~> 3.4.0

  	// ...

```



### Swift Package Manager



To use **SwiftLinkPreview** as a Swift Package Manager package just add the following in your **Package.swift** file.



```swift

import PackageDescription



let package = Package(

  name: "Your Target Name",

  dependencies: [

  	// ...

    .Package(url: "https://github.com/LeonardoCardoso/SwiftLinkPreview.git", "3.4.0")

  	// ...

  ]

)

```



### Manually



You just need to drop all contents in `Sources` folder, **but .plist files**, into Xcode project (make sure to enable "Copy items if needed" and "Create groups").



## Usage



#### Instatiating

```swift

import SwiftLinkPreview



// ...



let slp = SwiftLinkPreview(session: URLSession.shared,

			   workQueue: SwiftLinkPreview.defaultWorkQueue,

			   responseQueue: DispatchQueue.main,

		           cache: DisabledCache.instance)

```



#### Requesting preview

```swift

let preview = slp.preview("Text containing URL",

                          onSuccess: { result in print("\(result)") },

                          onError: { error in print("\(error)")})

// preview.cancel() to cancel it.

```

**result** is a struct ```Response```:



```swift

Response {

	let url: URL // URL

	let finalUrl: URL // unshortened URL

	let canonicalUrl: String // canonical URL

	let title: String // title

	let description: String // page description or relevant text

	let images: [String] // array of URLs of the images

	let image: String // main image

	let icon: String // favicon

	let video: String // video

	let price: String // price

}

```



#### Cancelling a request

```swift

let cancelablePreview = slp.preview(...,

				    onSuccess: ...,

				    onError: ...)



cancelablePreview.cancel()

```



#### Enabling and accessing cache



SLP has a built-in memory cache, so create your object as the following:



```swift

let slp = SwiftLinkPreview(cache: InMemoryCache())

```



To get the cached response:



```swift

if let cached = self.slp.cache.slp_getCachedResponse(url: String) {

    // Do whatever with the cached response

} else {

	// Perform preview otherwise

	slp.preview(...)

}

```



If you want to create your own cache, just implement this protocol and use it on the object initializer.



```swift

public protocol Cache {



    func slp_getCachedResponse(url: String) -> SwiftLinkPreview.Response?



    func slp_setCachedResponse(url: String, response: SwiftLinkPreview.Response?)

}

```



# FLOW



![flow](http://i.imgur.com/SMueQkA.png)



## Important



You need to set ```Allow Arbitrary Loads``` to ```YES``` on your project's Info.plist file.



![app security](http://i.imgur.com/41hGjCC.png)



If you don't want to use the option above and you are using ```SwiftLinkPreview``` for services of your knowledge, you can whitelist them on Info.plist file as well. You can read more about it [here](http://stackoverflow.com/questions/30739473/nsurlsession-nsurlconnection-http-load-failed-on-ios-9), [here](https://github.com/Alamofire/Alamofire#app-transport-security) and [here](https://ste.vn/2015/06/10/configuring-app-transport-security-ios-9-osx-10-11/).



![app security](http://i.imgur.com/INEp6q5.png)



## Tips



Not all websites will have their info brought, you can treat the info that your implementation gets as you like. But here are two tips about posting a preview:



* If some info is missing, you can offer the user to enter it. Take for example the description.

* If more than one image is fetched, you can offer the user the feature of picking one image.



## Tests



Feel free to fork this repo and add URLs on [SwiftLinkPreviewTests/URLs.swift](SwiftLinkPreviewTests/URLs.swift) to test URLs and help improving this lib. The more URLs the better the reliability.



## Information and Contact



Developed by [@LeonardoCardoso](https://github.com/LeonardoCardoso).



Contact me either by Twitter [@leocardz](https://twitter.com/leocardz) or emailing me to [[email protected]](mailto:[email protected]).



## Related Projects



* [Link Preview (PHP + Angular + Bootstrap)](https://github.com/LeonardoCardoso/Link-Preview)

* [Android Link Preview](https://github.com/LeonardoCardoso/Android-Link-Preview)



## License



    The MIT License (MIT)



	Copyright (c) 2016 Leonardo Cardoso



	Permission is hereby granted, free of charge, to any person obtaining a copy

	of this software and associated documentation files (the "Software"), to deal

	in the Software without restriction, including without limitation the rights

	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

	copies of the Software, and to permit persons to whom the Software is

	furnished to do so, subject to the following conditions:



	The above copyright notice and this permission notice shall be included in all

	copies or substantial portions of the Software.



	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

	SOFTWARE.



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