summaryrefslogtreecommitdiff
path: root/Xamarin.Forms.Platform.iOS/iOSAppLinks.cs
blob: f8771a93981711223e7a0d701fbdc624ea37ee8f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
using System;
using System.Threading.Tasks;
using CoreSpotlight;
using Foundation;
using UIKit;

namespace Xamarin.Forms.Platform.iOS
{
	internal class IOSAppLinks : IAppLinks
	{
		public async void DeregisterLink(IAppLinkEntry appLink)
		{
			if (string.IsNullOrWhiteSpace(appLink.AppLinkUri?.ToString()))
				throw new ArgumentNullException("AppLinkUri");
			await RemoveLinkAsync(appLink.AppLinkUri?.ToString());
		}

		public async void DeregisterLink(Uri uri)
		{
			if (string.IsNullOrWhiteSpace(uri?.ToString()))
				throw new ArgumentNullException(nameof(uri));
			await RemoveLinkAsync(uri.ToString());
		}

		public async void RegisterLink(IAppLinkEntry appLink)
		{
			if (string.IsNullOrWhiteSpace(appLink.AppLinkUri?.ToString()))
				throw new ArgumentNullException("AppLinkUri");
			await AddLinkAsync(appLink);
		}

		public async void DeregisterAll()
		{
			await ClearIndexedDataAsync();
		}

		static async Task AddLinkAsync(IAppLinkEntry deepLinkUri)
		{
			var appDomain = NSBundle.MainBundle.BundleIdentifier;
			string contentType, associatedWebPage;
			bool shouldAddToPublicIndex;

			//user can provide associatedWebPage, contentType, and shouldAddToPublicIndex
			TryGetValues(deepLinkUri, out contentType, out associatedWebPage, out shouldAddToPublicIndex);

			//our unique identifier  will be the only content that is common to spotlight search result and a activity
			//this id allows us to avoid duplicate search results from CoreSpotlight api and NSUserActivity
			//https://developer.apple.com/library/ios/technotes/tn2416/_index.html
			var id = deepLinkUri.AppLinkUri.ToString();

			var searchableAttributeSet = await GetAttributeSet(deepLinkUri, contentType, id);
			var searchItem = new CSSearchableItem(id, appDomain, searchableAttributeSet);
			//we need to make sure we index the item in spotlight first or the RelatedUniqueIdentifier will not work
			await IndexItemAsync(searchItem);

			var activity = new NSUserActivity($"{appDomain}.{contentType}");
			activity.Title = deepLinkUri.Title;
			activity.EligibleForSearch = true;

			//help increase your website url index rating
			if (!string.IsNullOrEmpty(associatedWebPage))
				activity.WebPageUrl = new NSUrl(associatedWebPage);

			//make this search result available to Apple and to other users thatdon't have your app
			activity.EligibleForPublicIndexing = shouldAddToPublicIndex;

			activity.UserInfo = GetUserInfoForActivity(deepLinkUri);
			activity.ContentAttributeSet = searchableAttributeSet;

			//we don't need to track if the link is active iOS will call ResignCurrent
			if (deepLinkUri.IsLinkActive)
				activity.BecomeCurrent();

			var aL = deepLinkUri as AppLinkEntry;
			if (aL != null)
			{
				aL.PropertyChanged += (sender, e) =>
				{
					if (e.PropertyName == AppLinkEntry.IsLinkActiveProperty.PropertyName)
					{
						if (aL.IsLinkActive)
							activity.BecomeCurrent();
						else
							activity.ResignCurrent();
					}
				};
			}
		}

		static Task<bool> ClearIndexedDataAsync()
		{
			var tcs = new TaskCompletionSource<bool>();
			if (CSSearchableIndex.IsIndexingAvailable)
				CSSearchableIndex.DefaultSearchableIndex.DeleteAll(error => tcs.TrySetResult(error == null));
			else
				tcs.TrySetResult(false);
			return tcs.Task;
		}

		static async Task<CSSearchableItemAttributeSet> GetAttributeSet(IAppLinkEntry deepLinkUri, string contentType, string id)
		{
			var searchableAttributeSet = new CSSearchableItemAttributeSet(contentType)
			{
				RelatedUniqueIdentifier = id,
				Title = deepLinkUri.Title,
				ContentDescription = deepLinkUri.Description,
				Url = new NSUrl(deepLinkUri.AppLinkUri.ToString())
			};

			var source = deepLinkUri.Thumbnail;
			IImageSourceHandler handler;
			if (source != null && (handler = Registrar.Registered.GetHandler<IImageSourceHandler>(source.GetType())) != null)
			{
				UIImage uiimage;
				try
				{
					uiimage = await handler.LoadImageAsync(source);

					if (uiimage == null)
						throw new InvalidOperationException("AppLinkEntry Thumbnail must be set to a valid source");

					searchableAttributeSet.ThumbnailData = uiimage.AsPNG();
					uiimage.Dispose();
				}
				catch (OperationCanceledException)
				{
					uiimage = null;
				}
			}

			return searchableAttributeSet;
		}

		static NSMutableDictionary GetUserInfoForActivity(IAppLinkEntry deepLinkUri)
		{
			//this info will only appear if not from a spotlight search
			var info = new NSMutableDictionary();
			info.Add(new NSString("link"), new NSString(deepLinkUri.AppLinkUri.ToString()));
			foreach (var item in deepLinkUri.KeyValues)
				info.Add(new NSString(item.Key), new NSString(item.Value));
			return info;
		}

		static Task<bool> IndexItemAsync(CSSearchableItem searchItem)
		{
			var tcs = new TaskCompletionSource<bool>();
			if (CSSearchableIndex.IsIndexingAvailable)
			{
				CSSearchableIndex.DefaultSearchableIndex.Index(new[] { searchItem }, error => tcs.TrySetResult(error == null));
			}
			else
				tcs.SetResult(false);
			return tcs.Task;
		}

		static Task<bool> RemoveLinkAsync(string identifier)
		{
			var tcs = new TaskCompletionSource<bool>();
			if (CSSearchableIndex.IsIndexingAvailable)
				CSSearchableIndex.DefaultSearchableIndex.Delete(new[] { identifier }, error => tcs.TrySetResult(error == null));
			else
				tcs.SetResult(false);
			return tcs.Task;
		}

		//Parse the KeyValues because user can provide associatedWebPage, contentType, and shouldAddToPublicIndex options
		static void TryGetValues(IAppLinkEntry deepLinkUri, out string contentType, out string associatedWebPage, out bool shouldAddToPublicIndex)
		{
			contentType = string.Empty;
			associatedWebPage = string.Empty;
			shouldAddToPublicIndex = false;
			var publicIndex = string.Empty;

			if (!deepLinkUri.KeyValues.TryGetValue(nameof(contentType), out contentType))
				contentType = "View";

			if (deepLinkUri.KeyValues.TryGetValue(nameof(publicIndex), out publicIndex))
				bool.TryParse(publicIndex, out shouldAddToPublicIndex);

			deepLinkUri.KeyValues.TryGetValue(nameof(associatedWebPage), out associatedWebPage);
		}
	}
}