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66 lines
3.0 KiB
66 lines
3.0 KiB
// Copyright (c) 2016-present, Facebook, Inc. All rights reserved.
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//
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// You are hereby granted a non-exclusive, worldwide, royalty-free license to use,
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// copy, modify, and distribute this software in source code or binary form for use
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// in connection with the web services and APIs provided by Facebook.
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//
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// As with any software that integrates with the Facebook platform, your use of
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// this software is subject to the Facebook Developer Principles and Policies
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// [http://developers.facebook.com/policy/]. This copyright notice shall be
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// included in all copies or substantial portions of the software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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import FBSDKShareKit
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import ObjectiveC.runtime
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/**
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Represents content that is sharable with the Graph API. This protocol is internal only, as it is only needed for
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internal sharable types. If we ever have custom types which implement `Content`, then we need to re-investigate
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this architecture.
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*/
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internal protocol SDKBridgedContent {
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var sdkSharingContentRepresentation: FBSDKSharingContent { get }
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}
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internal struct ContentBridger {
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// The only way for swift to guarantee a stable pointer is by using UnsafeMutablePointer.alloc. Using the `&`
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// operator, or using withUnsafePointer is liable to have a stack-copied pointer, not a static pointer, which is what we need.
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fileprivate static let contentHolderKey = UnsafeMutablePointer<UInt8>.allocate(capacity: 1)
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internal static func bridgeToObjC<C: ContentProtocol>(_ content: C) -> FBSDKSharingContent? {
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guard let nativeContent = content as? SDKBridgedContent else {
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return nil
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}
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let sdkRepresentation = nativeContent.sdkSharingContentRepresentation
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let contentHolder = SwiftContentHolder(swiftContent: content)
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objc_setAssociatedObject(sdkRepresentation, contentHolderKey, contentHolder, .OBJC_ASSOCIATION_RETAIN)
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return sdkRepresentation
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}
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internal static func bridgeToSwift<C: ContentProtocol>(_ content: FBSDKSharingContent) -> C? {
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let object = objc_getAssociatedObject(content, contentHolderKey)
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guard let contentHolder = object as? SwiftContentHolder<C> else {
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return nil
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}
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return contentHolder.swiftContent
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}
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}
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// Basic class wrapper for holding `Content`. This gets set as an associated object on the Objective-C
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// FBSDKSharingContent, so we can extract the swift content (which is probably a struct) back as its proper type.
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private class SwiftContentHolder<C: ContentProtocol>: NSObject {
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fileprivate let swiftContent: C
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fileprivate init(swiftContent: C) {
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self.swiftContent = swiftContent
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}
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}
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