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diff --git a/iOS/Pods/Kingfisher/Sources/Resource.swift b/iOS/Pods/Kingfisher/Sources/Resource.swift
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+//
+//  Resource.swift
+//  Kingfisher
+//
+//  Created by Wei Wang on 15/4/6.
+//
+//  Copyright (c) 2018 Wei Wang <onevcat@gmail.com>
+//
+//  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.
+
+import Foundation
+
+
+/// `Resource` protocol defines how to download and cache a resource from network.
+public protocol Resource {
+    /// The key used in cache.
+    var cacheKey: String { get }
+    
+    /// The target image URL.
+    var downloadURL: URL { get }
+}
+
+/**
+ ImageResource is a simple combination of `downloadURL` and `cacheKey`.
+ 
+ When passed to image view set methods, Kingfisher will try to download the target 
+ image from the `downloadURL`, and then store it with the `cacheKey` as the key in cache.
+ */
+public struct ImageResource: Resource {
+    /// The key used in cache.
+    public let cacheKey: String
+    
+    /// The target image URL.
+    public let downloadURL: URL
+    
+    /**
+     Create a resource.
+     
+     - parameter downloadURL: The target image URL.
+     - parameter cacheKey:    The cache key. If `nil`, Kingfisher will use the `absoluteString` of `downloadURL` as the key.
+     
+     - returns: A resource.
+     */
+    public init(downloadURL: URL, cacheKey: String? = nil) {
+        self.downloadURL = downloadURL
+        self.cacheKey = cacheKey ?? downloadURL.absoluteString
+    }
+}
+
+/**
+ URL conforms to `Resource` in Kingfisher.
+ The `absoluteString` of this URL is used as `cacheKey`. And the URL itself will be used as `downloadURL`.
+ If you need customize the url and/or cache key, use `ImageResource` instead.
+ */
+extension URL: Resource {
+    public var cacheKey: String { return absoluteString }
+    public var downloadURL: URL { return self }
+}