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Add support for NIP-65 Relay List Metadata
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,153 @@ | ||
| // | ||
| // RelayListMetadataEvent.swift | ||
| // | ||
| // | ||
| // Created by Terry Yiu on 7/13/24. | ||
| // | ||
|
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| import Foundation | ||
| import OrderedCollections | ||
|
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| /// Defines a replaceable event using kind 10002 to advertise preferred relays for discovering a user's content and receiving fresh content from others. | ||
| /// This event doesn't fully replace relay lists that are designed to configure a client's usage of relays. | ||
| /// Clients MAY use other relay lists in situations where ``RelayListMetadataEvent`` cannot be found. | ||
| /// | ||
| /// When seeking events from a user, clients SHOULD use the WRITE relays. | ||
| /// When seeking events about a user, where the user was tagged, clients SHOULD use the READ relays. | ||
| /// | ||
| /// When broadcasting an event, clients SHOULD: | ||
| /// - Broadcast the event to the WRITE relays of the author | ||
| /// - Broadcast the event to all READ relays of each tagged user | ||
| /// | ||
| /// > Note: [NIP 65 - Relay List Metadata](https://github.com/nostr-protocol/nips/blob/master/65.md) | ||
| public final class RelayListMetadataEvent: NostrEvent, NonParameterizedReplaceableEvent { | ||
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| public required init(from decoder: Decoder) throws { | ||
| try super.init(from: decoder) | ||
| } | ||
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| @available(*, unavailable, message: "This initializer is unavailable for this class.") | ||
| override init(kind: EventKind, content: String, tags: [Tag] = [], createdAt: Int64 = Int64(Date.now.timeIntervalSince1970), signedBy keypair: Keypair) throws { | ||
| try super.init(kind: kind, content: content, tags: tags, createdAt: createdAt, signedBy: keypair) | ||
| } | ||
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| init(tags: [Tag] = [], createdAt: Int64 = Int64(Date.now.timeIntervalSince1970), signedBy keypair: Keypair) throws { | ||
| try super.init(kind: .relayListMetadata, content: "", tags: tags, createdAt: createdAt, signedBy: keypair) | ||
| } | ||
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| /// The list of ``UserRelayMetadata`` that describes preferred relays for discovering the user's content and receiving fresh content from others | ||
| public var relayMetadataList: [UserRelayMetadata] { | ||
| tags.compactMap { UserRelayMetadata(tag: $0) } | ||
| } | ||
| } | ||
|
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| /// Describes a preferred relay for discovering a user's content and receiving fresh content from others. | ||
| public struct UserRelayMetadata: Equatable { | ||
| /// The URL of the preferred relay. | ||
| public let relayURL: URL | ||
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| /// The relay marker describing what type of events might be found from the preferred relay. | ||
| public let marker: Marker | ||
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| public enum Marker { | ||
| /// When seeking events about the user who authored the ``RelayListMetadataEvent``, where the user was tagged, | ||
| /// clients SHOULD use this relay as a read relay. | ||
| case read | ||
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| /// When seeking events from the user who authored the ``RelayListMetadataEvent``, | ||
| /// clients SHOULD use this relay as a write relay. | ||
| case write | ||
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| /// When seeking events about the user who authored the ``RelayListMetadataEvent``, where the user was tagged, | ||
| /// or when seeking events from the user who authored the ``RelayListMetadataEvent``, | ||
| /// clients SHOULD use this relay as a read and write relay. | ||
| case readAndWrite | ||
| } | ||
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| /// Creates a ``UserRelayMetadata`` from a ``Tag``. | ||
| /// The tag must have a tag name of `r`, value of a valid relay URL string, and, optionally, a marker of `read` or `write`. | ||
| /// If the marker is omitted, the relay is used for both read and write. | ||
| /// | ||
| /// A `nil` value is returned if the relay URL string is invalid or the marker is invalid. | ||
| /// | ||
| /// > Note: [NIP 65 - Relay List Metadata](https://github.com/nostr-protocol/nips/blob/master/65.md) | ||
| public init?(tag: Tag) { | ||
| guard tag.name == "r", let relayURL = try? RelayURLValidator.shared.validateRelayURLString(tag.value) else { | ||
| return nil | ||
| } | ||
|
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| switch tag.otherParameters.first { | ||
| case "read": | ||
| marker = .read | ||
| case "write": | ||
| marker = .write | ||
| case .none: | ||
| marker = .readAndWrite | ||
| case .some: | ||
| return nil | ||
| } | ||
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| self.relayURL = relayURL | ||
| } | ||
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| /// Creates a ``UserRelayMetadata`` from a relay ``URL`` and ``Marker``. | ||
| /// | ||
| /// A `nil` value is returned if the relay URL string is invalid. | ||
| /// | ||
| /// > Note: [NIP 65 - Relay List Metadata](https://github.com/nostr-protocol/nips/blob/master/65.md) | ||
| public init?(relayURL: URL, marker: Marker) { | ||
| guard let validatedRelayURL = try? RelayURLValidator.shared.validateRelayURL(relayURL) else { | ||
| return nil | ||
| } | ||
| self.relayURL = validatedRelayURL | ||
| self.marker = marker | ||
| } | ||
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| /// The ``Tag`` that represents the user relay metadata that can be used in a ``RelayListMetadataEvent``. | ||
| public var tag: Tag { | ||
| let otherParameters: [String] = switch marker { | ||
| case .read: | ||
| ["read"] | ||
| case .write: | ||
| ["write"] | ||
| case .readAndWrite: | ||
| [] | ||
| } | ||
| return Tag(name: "r", value: relayURL.absoluteString, otherParameters: otherParameters) | ||
| } | ||
| } | ||
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| public extension EventCreating { | ||
| /// Creates a ``RelayListMetadataEvent`` (kind 10002). | ||
| /// - Parameters: | ||
| /// - relayMetadataList: The list of ``UserRelayMetadata``. | ||
| /// - keypair: The ``Keypair`` to sign the event with. | ||
| func relayListMetadataEvent(withRelayMetadataList relayMetadataList: [UserRelayMetadata], signedBy keypair: Keypair) throws -> RelayListMetadataEvent { | ||
| // Using an ordered dictionary to retain the order of the list while de-duplicating the data. | ||
| var deduplicatedMetadata = OrderedDictionary<URL, UserRelayMetadata>() | ||
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| for metadata in relayMetadataList { | ||
| if let existingMetadata = deduplicatedMetadata[metadata.relayURL] { | ||
| // If the user relay metadata is identical between the duplicates, | ||
| // or if the existing one already has a read and write marker, skip it. | ||
| guard existingMetadata.marker != metadata.marker && existingMetadata.marker != .readAndWrite else { | ||
| continue | ||
| } | ||
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| // Any other permutation of markers will result in a combined marker of read and write. | ||
| switch metadata.marker { | ||
| case .readAndWrite: | ||
| // If the marker on `metadata` is set to read and write, just use that as the value | ||
| // instead of creating a new object (as a micro-optimization). | ||
| deduplicatedMetadata[metadata.relayURL] = metadata | ||
| default: | ||
| deduplicatedMetadata[metadata.relayURL] = UserRelayMetadata(relayURL: metadata.relayURL, marker: .readAndWrite) | ||
| } | ||
| } else { | ||
| deduplicatedMetadata[metadata.relayURL] = metadata | ||
| } | ||
| } | ||
|
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| return try RelayListMetadataEvent(tags: deduplicatedMetadata.map { $0.value.tag }, signedBy: keypair) | ||
| } | ||
| } |
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140 changes: 140 additions & 0 deletions
140
Tests/NostrSDKTests/Events/RelayListMetadataEventTests.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| // | ||
| // RelayListMetadataEventTests.swift | ||
| // | ||
| // | ||
| // Created by Terry Yiu on 7/14/24. | ||
| // | ||
|
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| @testable import NostrSDK | ||
| import XCTest | ||
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| final class RelayListMetadataEventTests: XCTestCase, EventCreating, EventVerifying, FixtureLoading { | ||
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| func testCreateRelayListMetadata() throws { | ||
| let relayURL1 = try XCTUnwrap(URL(string: "wss://relay.primal.net")) | ||
| let relayURL2 = try XCTUnwrap(URL(string: "wss://relay.damus.io")) | ||
| let relayURL3 = try XCTUnwrap(URL(string: "wss://relay.snort.social")) | ||
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| let expectedRelayMetadataList: [UserRelayMetadata] = [ | ||
| try XCTUnwrap(UserRelayMetadata(relayURL: relayURL1, marker: .read)), | ||
| try XCTUnwrap(UserRelayMetadata(relayURL: relayURL2, marker: .write)), | ||
| try XCTUnwrap(UserRelayMetadata(relayURL: relayURL3, marker: .readAndWrite)) | ||
| ] | ||
| let event = try XCTUnwrap(relayListMetadataEvent(withRelayMetadataList: expectedRelayMetadataList, signedBy: Keypair.test)) | ||
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| let expectedEventCoordinates = try XCTUnwrap(EventCoordinates(kind: .relayListMetadata, pubkey: Keypair.test.publicKey)) | ||
| XCTAssertEqual(event.replaceableEventCoordinates(), expectedEventCoordinates) | ||
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| let tag1 = Tag(name: "r", value: relayURL1.absoluteString, otherParameters: ["read"]) | ||
| let tag2 = Tag(name: "r", value: relayURL2.absoluteString, otherParameters: ["write"]) | ||
| let tag3 = Tag(name: "r", value: relayURL3.absoluteString) | ||
| XCTAssertEqual(event.tags, [tag1, tag2, tag3]) | ||
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| let relayMetadataList = event.relayMetadataList | ||
| XCTAssertEqual(relayMetadataList.count, expectedRelayMetadataList.count) | ||
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| XCTAssertEqual(relayMetadataList[0].relayURL.absoluteString, relayURL1.absoluteString) | ||
| XCTAssertEqual(relayMetadataList[0].marker, .read) | ||
| XCTAssertEqual(relayMetadataList[0].tag, tag1) | ||
| XCTAssertEqual(relayMetadataList[1].relayURL.absoluteString, relayURL2.absoluteString) | ||
| XCTAssertEqual(relayMetadataList[1].marker, .write) | ||
| XCTAssertEqual(relayMetadataList[1].tag, tag2) | ||
| XCTAssertEqual(relayMetadataList[2].relayURL.absoluteString, relayURL3.absoluteString) | ||
| XCTAssertEqual(relayMetadataList[2].marker, .readAndWrite) | ||
| XCTAssertEqual(relayMetadataList[2].tag, tag3) | ||
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| try verifyEvent(event) | ||
| } | ||
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| func testCreateRelayListMetadataWithDuplicates() throws { | ||
| let relayURL1 = try XCTUnwrap(URL(string: "wss://relay.primal.net")) | ||
| let relayURL2 = try XCTUnwrap(URL(string: "wss://relay.damus.io")) | ||
| let relayURL3 = try XCTUnwrap(URL(string: "wss://relay.snort.social")) | ||
| let relayURL4 = try XCTUnwrap(URL(string: "wss://relay.nostrsdk.com")) | ||
| let relayURL5 = try XCTUnwrap(URL(string: "wss://relay.coracle.social")) | ||
| let relayURL6 = try XCTUnwrap(URL(string: "wss://relay.nostr.band")) | ||
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| let relayMetadataListWithDuplicates: [UserRelayMetadata] = [ | ||
| try XCTUnwrap(UserRelayMetadata(relayURL: relayURL1, marker: .read)), | ||
| try XCTUnwrap(UserRelayMetadata(relayURL: relayURL2, marker: .write)), | ||
| try XCTUnwrap(UserRelayMetadata(relayURL: relayURL3, marker: .read)), | ||
| try XCTUnwrap(UserRelayMetadata(relayURL: relayURL4, marker: .readAndWrite)), | ||
| try XCTUnwrap(UserRelayMetadata(relayURL: relayURL5, marker: .write)), | ||
| try XCTUnwrap(UserRelayMetadata(relayURL: relayURL6, marker: .read)), | ||
| try XCTUnwrap(UserRelayMetadata(relayURL: relayURL6, marker: .read)), | ||
| try XCTUnwrap(UserRelayMetadata(relayURL: relayURL5, marker: .write)), | ||
| try XCTUnwrap(UserRelayMetadata(relayURL: relayURL4, marker: .write)), | ||
| try XCTUnwrap(UserRelayMetadata(relayURL: relayURL3, marker: .readAndWrite)), | ||
| try XCTUnwrap(UserRelayMetadata(relayURL: relayURL2, marker: .read)), | ||
| try XCTUnwrap(UserRelayMetadata(relayURL: relayURL1, marker: .write)) | ||
| ] | ||
| let event = try XCTUnwrap(relayListMetadataEvent(withRelayMetadataList: relayMetadataListWithDuplicates, signedBy: Keypair.test)) | ||
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| let expectedEventCoordinates = try XCTUnwrap(EventCoordinates(kind: .relayListMetadata, pubkey: Keypair.test.publicKey)) | ||
| XCTAssertEqual(event.replaceableEventCoordinates(), expectedEventCoordinates) | ||
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| let tag1 = Tag(name: "r", value: relayURL1.absoluteString) | ||
| let tag2 = Tag(name: "r", value: relayURL2.absoluteString) | ||
| let tag3 = Tag(name: "r", value: relayURL3.absoluteString) | ||
| let tag4 = Tag(name: "r", value: relayURL4.absoluteString) | ||
| let tag5 = Tag(name: "r", value: relayURL5.absoluteString, otherParameters: ["write"]) | ||
| let tag6 = Tag(name: "r", value: relayURL6.absoluteString, otherParameters: ["read"]) | ||
| XCTAssertEqual(event.tags, [tag1, tag2, tag3, tag4, tag5, tag6]) | ||
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| let relayMetadataList = event.relayMetadataList | ||
| XCTAssertEqual(relayMetadataList.count, 6) | ||
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| XCTAssertEqual(relayMetadataList[0].relayURL.absoluteString, relayURL1.absoluteString) | ||
| XCTAssertEqual(relayMetadataList[0].marker, .readAndWrite) | ||
| XCTAssertEqual(relayMetadataList[0].tag, tag1) | ||
| XCTAssertEqual(relayMetadataList[1].relayURL.absoluteString, relayURL2.absoluteString) | ||
| XCTAssertEqual(relayMetadataList[1].marker, .readAndWrite) | ||
| XCTAssertEqual(relayMetadataList[1].tag, tag2) | ||
| XCTAssertEqual(relayMetadataList[2].relayURL.absoluteString, relayURL3.absoluteString) | ||
| XCTAssertEqual(relayMetadataList[2].marker, .readAndWrite) | ||
| XCTAssertEqual(relayMetadataList[2].tag, tag3) | ||
| XCTAssertEqual(relayMetadataList[3].relayURL.absoluteString, relayURL4.absoluteString) | ||
| XCTAssertEqual(relayMetadataList[3].marker, .readAndWrite) | ||
| XCTAssertEqual(relayMetadataList[3].tag, tag4) | ||
| XCTAssertEqual(relayMetadataList[4].relayURL.absoluteString, relayURL5.absoluteString) | ||
| XCTAssertEqual(relayMetadataList[4].marker, .write) | ||
| XCTAssertEqual(relayMetadataList[4].tag, tag5) | ||
| XCTAssertEqual(relayMetadataList[5].relayURL.absoluteString, relayURL6.absoluteString) | ||
| XCTAssertEqual(relayMetadataList[5].marker, .read) | ||
| XCTAssertEqual(relayMetadataList[5].tag, tag6) | ||
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| try verifyEvent(event) | ||
| } | ||
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| func testDecodeRelayListMetadata() throws { | ||
| let event: RelayListMetadataEvent = try decodeFixture(filename: "relay_list_metadata") | ||
| XCTAssertEqual(event.id, "68962e8499c2067306b2daaa8811b95f38d5e7b8954976d15a8419751a96757a") | ||
| XCTAssertEqual(event.pubkey, "cb9f20cbd8616dcb79ce1dbdcec702b9b1549e678225ce035b31db4d820f4418") | ||
| XCTAssertEqual(event.createdAt, 1720822990) | ||
| XCTAssertEqual(event.kind, .relayListMetadata) | ||
| XCTAssertEqual(event.content, "") | ||
| XCTAssertEqual(event.signature, "0b40f4f5de3f6cb2223a7961d7b2a3c8f3b5944a275dc27ba3cea765f6be127fb311f10218e25001bee0e30ac6a2ed7dfa45d8c77e3973ce599eaa0bd1e2423b") | ||
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| let publicKey = try XCTUnwrap(PublicKey(hex: event.pubkey)) | ||
| let expectedEventCoordinates = try XCTUnwrap(EventCoordinates(kind: .relayListMetadata, pubkey: publicKey)) | ||
| XCTAssertEqual(event.replaceableEventCoordinates(), expectedEventCoordinates) | ||
|
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| let tag1 = Tag(name: "r", value: "wss://relay.momostr.pink/") | ||
| let tag2 = Tag(name: "r", value: "wss://relay.primal.net/", otherParameters: ["read"]) | ||
| let tag3 = Tag(name: "r", value: "wss://relay.nostr.band/", otherParameters: ["read"]) | ||
|
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| XCTAssertEqual(event.tags, [tag1, tag2, tag3]) | ||
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| XCTAssertEqual(event.relayMetadataList.count, 3) | ||
| XCTAssertEqual(event.relayMetadataList[0].relayURL.absoluteString, "wss://relay.momostr.pink/") | ||
| XCTAssertEqual(event.relayMetadataList[0].marker, .readAndWrite) | ||
| XCTAssertEqual(event.relayMetadataList[0].tag, tag1) | ||
| XCTAssertEqual(event.relayMetadataList[1].relayURL.absoluteString, "wss://relay.primal.net/") | ||
| XCTAssertEqual(event.relayMetadataList[1].marker, .read) | ||
| XCTAssertEqual(event.relayMetadataList[1].tag, tag2) | ||
| XCTAssertEqual(event.relayMetadataList[2].relayURL.absoluteString, "wss://relay.nostr.band/") | ||
| XCTAssertEqual(event.relayMetadataList[2].marker, .read) | ||
| XCTAssertEqual(event.relayMetadataList[2].tag, tag3) | ||
| } | ||
|
|
||
| } |
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