implement APIs for LLS observation

ElementX/Sources/Services/Location/LiveLocationShareProxy.swift

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+//
+// Copyright 2026 Element Creations Ltd.
+//
+// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+// Please see LICENSE files in the repository root for full details.
+//
+
+import Foundation
+import MatrixRustSDK
+
+struct LiveLocationShareProxy: Hashable {
+    let userID: String
+    let geoURI: GeoURI?
+    let timestamp: Date
+    let timeoutDate: Date
+}
+
+extension LiveLocationShareProxy {
+    init(liveLocationShare: LiveLocationShare) {
+        userID = liveLocationShare.userId
+        if let geoURI = liveLocationShare.lastLocation?.location.geoUri {
+            self.geoURI = GeoURI(string: geoURI)
+        } else {
+            geoURI = nil
+        }
+        timestamp = Date(timeIntervalSince1970: Double(liveLocationShare.startTs))
+        timeoutDate = timestamp.addingTimeInterval(Double(liveLocationShare.timeout) / 1000)
+    }
+}

ElementX/Sources/Services/Location/LiveLocationSharesService.swift

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+//
+// Copyright 2026 Element Creations Ltd.
+//
+// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+// Please see LICENSE files in the repository root for full details.
+//
+
+import Combine
+import Foundation
+import MatrixRustSDK
+
+final class LiveLocationSharesService: LiveLocationSharesServiceProtocol {
+    // periphery:ignore - required for instance retention in the rust codebase
+    private let liveLocationShares: LiveLocationShares
+    // periphery:ignore - required for instance retention in the rust codebase
+    private var observationToken: TaskHandle?
+    
+    private let liveLocationSharesSubject = PassthroughSubject<[LiveLocationShareProxy], Never>()
+    var liveLocationSharesPublisher: AnyPublisher<[LiveLocationShareProxy], Never> {
+        liveLocationSharesSubject.eraseToAnyPublisher()
+    }
+    
+    private var previousLiveLocationShares: [LiveLocationShareProxy] = []
+    
+    init(liveLocationShares: LiveLocationShares) {
+        self.liveLocationShares = liveLocationShares
+        observationToken = liveLocationShares
+            .subscribe(listener: SDKListener { [weak self] updates in
+                guard let self else { return }
+                
+                MXLog.info("Received live location shares update")
+                let updatedShares = handleLiveLocationShareUpdates(updates)
+                liveLocationSharesSubject.send(updatedShares)
+            })
+    }
+    
+    // MARK: - Private
+    
+    private func handleLiveLocationShareUpdates(_ updates: [LiveLocationShareUpdate]) -> [LiveLocationShareProxy] {
+        var shares = previousLiveLocationShares
+        
+        for update in updates {
+            switch update {
+            case .append(let values):
+                shares.append(contentsOf: values.map(LiveLocationShareProxy.init))
+            case .clear:
+                shares.removeAll()
+            case .pushFront(let value):
+                shares.insert(LiveLocationShareProxy(liveLocationShare: value), at: 0)
+            case .pushBack(let value):
+                shares.append(LiveLocationShareProxy(liveLocationShare: value))
+            case .popFront:
+                shares.removeFirst()
+            case .popBack:
+                shares.removeLast()
+            case .insert(let index, let value):
+                shares.insert(LiveLocationShareProxy(liveLocationShare: value), at: Int(index))
+            case .set(let index, let value):
+                shares[Int(index)] = LiveLocationShareProxy(liveLocationShare: value)
+            case .remove(let index):
+                shares.remove(at: Int(index))
+            case .truncate(let length):
+                shares.removeSubrange(Int(length)..<shares.count)
+            case .reset(let values):
+                shares = values.map(LiveLocationShareProxy.init)
+            }
+        }
+        
+        previousLiveLocationShares = shares
+        return shares
+    }
+}

ElementX/Sources/Services/Location/LiveLocationSharesServiceProtocol.swift

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+//
+// Copyright 2026 Element Creations Ltd.
+//
+// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+// Please see LICENSE files in the repository root for full details.
+//
+
+import Combine
+import Foundation
+
+// sourcery: AutoMockable
+protocol LiveLocationSharesServiceProtocol {
+    var liveLocationSharesPublisher: AnyPublisher<[LiveLocationShareProxy], Never> { get }
+}