Download and parse user lists

CHANGELOG.md

@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Internal Changes
 - Upgraded to Xcode 16. [#1570](https://github.com/planetary-social/nos/issues/1570)
+- Download and parse an author’s lists when viewing their profile. [#49](https://github.com/verse-pbc/issues/issues/49)
 
 ## [1.0.3] - 2024-12-04Z
 

Nos/Models/AuthorListError.swift

@@ -0,0 +1,13 @@
+import Foundation
+
+/// Errors for an ``AuthorList``.
+enum AuthorListError: LocalizedError, Equatable {
+    /// The event kind is invalid; that is, an ``AuthorList`` can't be created with the given kind.
+    case invalidKind
+
+    /// The signature is invalid.
+    case invalidSignature(AuthorList)
+
+    /// The replaceable ID is missing (the `d` tag from the JSON event).
+    case missingReplaceableID
+}

Nos/Models/CoreData/AuthorList+CoreDataClass.swift

@@ -0,0 +1,68 @@
+import Foundation
+import CoreData
+
+@objc(AuthorList)
+public class AuthorList: Event {
+    static func createOrUpdate(
+        from jsonEvent: JSONEvent,
+        in context: NSManagedObjectContext
+    ) throws -> AuthorList {
+        guard jsonEvent.kind == EventKind.followSet.rawValue else { throw AuthorListError.invalidKind }
+        guard let replaceableID = jsonEvent.replaceableID else { throw AuthorListError.missingReplaceableID }
+        let owner = try Author.findOrCreate(by: jsonEvent.pubKey, context: context)
+
+        // Fetch existing AuthorList if it exists
+        let fetchRequest = AuthorList.authorList(by: replaceableID, owner: owner, kind: EventKind.followSet.rawValue)
+        let existingAuthorList = try context.fetch(fetchRequest).first
+        existingAuthorList?.authors = Set()
+
+        let authorList = existingAuthorList ?? AuthorList(context: context)
+        authorList.createdAt = jsonEvent.createdDate
+        authorList.author = owner
+        authorList.owner = owner
+        authorList.identifier = jsonEvent.id
+        authorList.replaceableIdentifier = replaceableID
+        authorList.kind = jsonEvent.kind
+        authorList.signature = jsonEvent.signature
+        authorList.allTags = jsonEvent.tags as NSObject
+        authorList.content = jsonEvent.content
+
+        let tags = jsonEvent.tags
+
+        for tag in tags {
+            if tag[safe: 0] == "p", let authorID = tag[safe: 1] {
+                let author = try Author.findOrCreate(by: authorID, context: context)
+                authorList.addToAuthors(author)
+            } else if tag[safe: 0] == "title" {
+                authorList.title = tag[safe: 1]
+            } else if tag[safe: 0] == "image" {
+                if let urlString = tag[safe: 1] {
+                    authorList.image = URL(string: urlString)
+                } else {
+                    authorList.image = nil
+                }
+            } else if tag[safe: 0] == "description" {
+                authorList.listDescription = tag[safe: 1]
+            }
+        }
+
+        return authorList
+    }
+
+    @nonobjc public class func authorList(
+        by replaceableID: RawReplaceableID,
+        owner: Author,
+        kind: Int64
+    ) -> NSFetchRequest<AuthorList> {
+        let fetchRequest = NSFetchRequest<AuthorList>(entityName: "AuthorList")
+        fetchRequest.predicate = NSPredicate(
+            format: "replaceableIdentifier = %@ AND owner = %@ AND kind = %i",
+            replaceableID,
+            owner,
+            kind
+        )
+        fetchRequest.sortDescriptors = [NSSortDescriptor(keyPath: \AuthorList.identifier, ascending: true)]
+        fetchRequest.fetchLimit = 1
+        return fetchRequest
+    }
+}

Nos/Models/CoreData/Generated/AuthorList+CoreDataProperties.swift

@@ -0,0 +1,41 @@
+import Foundation
+import CoreData
+
+extension AuthorList {
+
+    @nonobjc public class func fetchRequest() -> NSFetchRequest<AuthorList> {
+        NSFetchRequest<AuthorList>(entityName: "AuthorList")
+    }
+
+    /// The URL of an image representing the list.
+    @NSManaged public var image: URL?
+
+    /// The description of the list.
+    @NSManaged public var listDescription: String?
+
+    /// The title of the list.
+    @NSManaged public var title: String?
+
+    /// The owner of the list; the ``Author`` who created it.
+    /// Duplicates ``author`` but Core Data won't allow for multiple relationships to have the same inverse.
+    @NSManaged public var owner: Author?
+
+    /// The set of unique authors in this list.
+    @NSManaged public var authors: Set<Author>
+}
+
+// MARK: Generated accessors for authors
+extension AuthorList {
+
+    @objc(addAuthorsObject:)
+    @NSManaged public func addToAuthors(_ value: Author)
+
+    @objc(removeAuthorsObject:)
+    @NSManaged public func removeFromAuthors(_ value: Author)
+
+    @objc(addAuthors:)
+    @NSManaged public func addToAuthors(_ values: NSSet)
+
+    @objc(removeAuthors:)
+    @NSManaged public func removeFromAuthors(_ values: NSSet)
+}

Nos/Models/CoreData/Nos.xcdatamodeld/.xccurrentversion

@@ -3,6 +3,6 @@
 <plist version="1.0">
 <dict>
 	<key>_XCCurrentVersionName</key>
-	<string>Nos 20.xcdatamodel</string>
+	<string>Nos 21.xcdatamodel</string>
 </dict>
 </plist>

Nos/Models/CoreData/Nos.xcdatamodeld/Nos 21.xcdatamodel/.xccurrentversion

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>_XCCurrentVersionName</key>
+	<string>Nos.xcdatamodel</string>
+</dict>
+</plist>

Nos/Models/CoreData/Nos.xcdatamodeld/Nos 21.xcdatamodel/Nos.xcdatamodel/contents

@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="21513" systemVersion="22D68" minimumToolsVersion="Automatic" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">
+    <entity name="Author" representedClassName=".Author" syncable="YES" codeGenerationType="category">
+        <attribute name="about" optional="YES" attributeType="String"/>
+        <attribute name="displayName" optional="YES" attributeType="String"/>
+        <attribute name="hexadecimalPublicKey" attributeType="String"/>
+        <attribute name="lastUpdatedContactList" optional="YES" attributeType="Date" usesScalarValueType="NO"/>
+        <attribute name="lastUpdatedMetadata" optional="YES" attributeType="Date" usesScalarValueType="NO"/>
+        <attribute name="muted" optional="YES" attributeType="Boolean" usesScalarValueType="YES"/>
+        <attribute name="name" optional="YES" attributeType="String"/>
+        <attribute name="nip05" optional="YES" attributeType="String"/>
+        <attribute name="profilePhotoURL" optional="YES" attributeType="URI"/>
+        <attribute name="rawMetadata" optional="YES" attributeType="Binary"/>
+        <relationship name="events" optional="YES" toMany="YES" deletionRule="Nullify" destinationEntity="Event" inverseName="author" inverseEntity="Event"/>
+        <relationship name="followers" optional="YES" toMany="YES" deletionRule="Nullify" destinationEntity="Follow" inverseName="destination" inverseEntity="Follow"/>
+        <relationship name="follows" optional="YES" toMany="YES" deletionRule="Cascade" destinationEntity="Follow" inverseName="source" inverseEntity="Follow"/>
+        <relationship name="relays" optional="YES" toMany="YES" deletionRule="Nullify" destinationEntity="Relay"/>
+    </entity>
+    <entity name="AuthorReference" representedClassName="AuthorReference" syncable="YES" codeGenerationType="category">
+        <attribute name="pubkey" optional="YES" attributeType="String"/>
+        <attribute name="recommendedRelayUrl" optional="YES" attributeType="String"/>
+        <relationship name="event" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="Event" inverseName="authorReferences" inverseEntity="Event"/>
+    </entity>
+    <entity name="Event" representedClassName=".Event" syncable="YES" codeGenerationType="category">
+        <attribute name="allTags" optional="YES" attributeType="Transformable" valueTransformerName="NSSecureUnarchiveFromDataTransformerName"/>
+        <attribute name="content" optional="YES" attributeType="String"/>
+        <attribute name="createdAt" optional="YES" attributeType="Date" usesScalarValueType="NO"/>
+        <attribute name="identifier" attributeType="String"/>
+        <attribute name="kind" optional="YES" attributeType="Integer 64" defaultValueString="0" usesScalarValueType="YES"/>
+        <attribute name="sendAttempts" optional="YES" attributeType="Integer 16" usesScalarValueType="YES"/>
+        <attribute name="signature" optional="YES" attributeType="String"/>
+        <relationship name="author" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="Author" inverseName="events" inverseEntity="Author"/>
+        <relationship name="authorReferences" optional="YES" toMany="YES" deletionRule="Nullify" ordered="YES" destinationEntity="AuthorReference" inverseName="event" inverseEntity="AuthorReference"/>
+        <relationship name="deletedOn" optional="YES" toMany="YES" deletionRule="Nullify" destinationEntity="Relay"/>
+        <relationship name="eventReferences" optional="YES" toMany="YES" deletionRule="Nullify" ordered="YES" destinationEntity="EventReference" inverseName="referencingEvent" inverseEntity="EventReference"/>
+        <relationship name="publishedTo" optional="YES" toMany="YES" deletionRule="Nullify" destinationEntity="Relay"/>
+        <relationship name="referencingEvents" optional="YES" toMany="YES" deletionRule="Nullify" destinationEntity="EventReference" inverseName="referencedEvent" inverseEntity="EventReference"/>
+    </entity>
+    <entity name="EventReference" representedClassName="EventReference" syncable="YES" codeGenerationType="category">
+        <attribute name="eventId" optional="YES" attributeType="String"/>
+        <attribute name="marker" optional="YES" attributeType="String"/>
+        <attribute name="recommendedRelayUrl" optional="YES" attributeType="String"/>
+        <relationship name="referencedEvent" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="Event" inverseName="referencingEvents" inverseEntity="Event"/>
+        <relationship name="referencingEvent" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="Event" inverseName="eventReferences" inverseEntity="Event"/>
+    </entity>
+    <entity name="Follow" representedClassName=".Follow" syncable="YES" codeGenerationType="category">
+        <attribute name="lastUpdated" optional="YES" attributeType="Date" usesScalarValueType="NO"/>
+        <attribute name="petName" optional="YES" attributeType="String"/>
+        <relationship name="destination" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="Author" inverseName="followers" inverseEntity="Author"/>
+        <relationship name="source" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="Author" inverseName="follows" inverseEntity="Author"/>
+    </entity>
+    <entity name="Relay" representedClassName=".Relay" syncable="YES" codeGenerationType="category">
+        <attribute name="address" attributeType="String"/>
+        <attribute name="createdAt" optional="YES" attributeType="Date" usesScalarValueType="NO"/>
+    </entity>
+</model>