Start JSONFeed parser. No idea if it works yet.

Frameworks/RSParser/Feeds/FeedParserError.swift

@@ -14,7 +14,9 @@ public struct FeedParserError: Error {
 
 		case rssChannelNotFound
 		case rssItemsNotFound
-
+		case jsonFeedVersionNotFound
+		case jsonFeedItemsNotFound
+		case jsonFeedTitleNotFound
 	}
 
 	public let errorType: FeedParserErrorType

Frameworks/RSParser/Feeds/JSON/JSONFeedParser.swift

@@ -0,0 +1,166 @@
+//
+//  JSONFeedParser.swift
+//  RSParser
+//
+//  Created by Brent Simmons on 6/25/17.
+//  Copyright © 2017 Ranchero Software, LLC. All rights reserved.
+//
+
+import Foundation
+
+// See https://jsonfeed.org/version/1
+
+public struct JSONFeedParser {
+
+	public static func parse(parserData: ParserData) throws -> ParsedFeed? {
+
+		do {
+			let parsedObject = try JSONSerialization.jsonObject(with: parserData.data)
+
+			guard let version = parsedObject["version"] as? String, version.hasPrefix("https://jsonfeed.org/version/") else {
+				throw FeedParserError(.jsonFeedVersionNotFound)
+			}
+			guard let itemsArray = parsedObject["items"] as? JSONArray else {
+				throw FeedParserError(.jsonFeedItemsNotFound)
+			}
+			guard let title = parsedObject["title"] as? String else {
+				throw FeedParserError(.jsonFeedTitleNotFound)
+			}
+
+			let homePageURL = parsedObject["home_page_url"] as? String
+			let feedURL = parsedObject["feed_url"] ?? parserData.url
+			let feedDescription = parsedObject["description"] as? String
+			let nextURL = parsedObject["next_url"] as? String
+			let iconURL = parsedObject["icon_url"] as? String
+			let faviconURL = parsedObject["favicon_url"] as? String
+			let authors = parseAuthors(parsedObject)
+			let expired = parsedObject["expired"] as? Bool ?? false
+			let hubs = parseHubs(parsedObject)
+
+			let items = parseItems(itemsArray)
+
+			return ParsedFeed(type: .jsonFeed, title: title, homePageURL: homePageURL, feedURL: feedURL, feedDescription: feedDescription, nextURL: nextURL, iconURL: iconURL, faviconURL: faviconURL, authors: authors, expired: expired, hubs: hubs, items: items)
+
+		}
+		catch { throw error }
+	}
+}
+
+private extension JSONFeedParser {
+
+	func parseAuthors(_ dictionary: JSONDictionary) -> [ParsedAuthor]? {
+
+		guard let authorDictionary = dictionary["author"] as? JSONDictionary else {
+			return nil
+		}
+
+		let name = authorDictionary["name"]
+		let url = authorDictionary["url"]
+		let avatar = authorDictionary["avatar"]
+		if name == nil && url == nil && avatar == nil {
+			return nil
+		}
+		let parsedAuthor = ParsedAuthor(name: name, url: url, avatarURL: avatar, emailAddress: nil)
+		return [parsedAuthor]
+	}
+
+	func parseHubs(_ dictionary: JSONDictionary) -> [ParsedHub]? {
+
+		guard let hubsArray = dictionary["hubs"] as? JSONArray else {
+			return nil
+		}
+
+		let hubs = hubsArray.flatMap { (oneHubDictionary) -> ParsedHub? in
+			guard let oneHubURL = oneHubDictionary["url"], let oneHubType = oneHubDictionary["type"] else {
+				return nil
+			}
+			return ParsedHub(type: oneHubType, url: oneHubURL)
+		}
+		return hubs.isEmpty ? nil : hubs
+	}
+
+	func parseItems(_ itemsArray: JSONArray) -> [ParsedItem] {
+
+		return itemsArray.flatMap { (oneItemDictionary) -> ParsedItem? in
+			return parseItem(oneItemDictionary)
+		}
+	}
+
+	func parseItem(_ itemDictionary: JSONDictionary) -> ParsedItem? {
+
+		guard let uniqueID = parseUniqueID(itemDictionary) else {
+			return nil
+		}
+
+		let contentHTML = itemDictionary["content_html"] as? String
+		let contentText = itemDictionary["content_text"] as? String
+		if contentHTML == nil && contentText == nil {
+			return nil
+		}
+
+		let url = itemDictionary["url"] as? String
+		let externalURL = itemDictionary["external_url"] as? String
+		let title = itemDictionary["title"] as? String
+		let summary = itemDictionary["summary"] as? String
+		let imageURL = itemDictionary["image"] as? String
+		let bannerImageURL = itemDictionary["banner_image"] as? String
+
+		let datePublished = parseDate(itemDictionary["date_published"])
+		let dateModified = parseDate(itemDictionary["date_modified"])
+
+		let authors = parseAuthors(itemDictionary)
+		let tags = itemDictionary["tags"] as? [String]
+		let attachments = parseAttachments(itemDictionary)
+
+		return ParsedItem(uniqueID: uniqueID, url: url, externalURL: externalURL, title: title, contentHTML: contentHTML, contentText: contentText, summary: summary, imageURL: imageURL, bannerImageURL: bannerImageURL, datePublished: datePublished, dateModified: dateModified, authors: authors, tags: tags, attachments: attachments)
+	}
+
+	func parseUniqueID(_ itemDictionary: JSONDictionary) -> String? {
+
+		if let uniqueID = itemDictionary["id"] as? String {
+			return uniqueID // Spec says it must be a string
+		}
+		// Spec also says that if it’s a number, even though that’s incorrect, it should be coerced to a string.
+		if let uniqueID = itemDictionary["id"] as? Int {
+			return "\(uniqueID)"
+		}
+		if let uniqueID = itemDictionary["id"] as? Double {
+			return "\(uniqueID)"
+		}
+		return nil
+	}
+
+	func parseDate(_ dateString: String?) -> Date? {
+
+		guard let dateString = dateString, !dateString.isEmpty else {
+			return nil
+		}
+		return RSDateWithString(dateString)
+	}
+
+	func parseAttachments(_ itemDictionary: JSONDictionary) -> [ParsedAttachment]? {
+
+		guard let attachmentsArray = itemDictionary["attachments"] as? JSONArray else {
+			return nil
+		}
+		return attachmentsArray.flatMap { (oneAttachmentObject) -> ParsedAttachment? in
+			return parseAttachment(oneAttachmentObject)
+		}
+	}
+
+	func parseAttachment(_ attachmentObject: JSONDictionary) -> ParsedAttachment? {
+
+		guard let url = attachmentObject["url"] as? String else {
+			return nil
+		}
+		guard let mimeType = attachmentObject["mime_type"] as? String else {
+			return nil
+		}
+
+		let title = attachmentObject["title"] as? String
+		let sizeInBytes = attachmentObject["size_in_bytes"] as? Int
+		let durationInSeconds = attachmentObject["duration_in_seconds"] as? Int
+		
+		return ParsedAttachment(url: url, mimeType: mimeType, title: title, sizeInBytes: sizeInBytes, durationInSeconds: durationInSeconds)
+	}
+}

Frameworks/RSParser/Feeds/JSON/RSSInJSONParser.swift

@@ -104,7 +104,7 @@ private extension RSSInJSONParser {
 			if let externalURL = externalURL {
 				s += externalURL
 			}
-			if let authorEmailAddress = authorEmailAddress {
+			if let authorEmailAddress = authors?.first?.emailAddress {
 				s += authorEmailAddress
 			}
 			if let oneAttachmentURL = attachments?.first?.url {

Frameworks/RSParser/RSParser.xcodeproj/project.pbxproj

@@ -50,6 +50,7 @@
 		84469D381EFF2645004A6B28 /* RSSInJSONParser.swift in Sources */ = {isa = PBXBuildFile; fileRef = 84469D371EFF2645004A6B28 /* RSSInJSONParser.swift */; };
 		84469D401EFF29A9004A6B28 /* FeedParserError.swift in Sources */ = {isa = PBXBuildFile; fileRef = 84469D3F1EFF29A9004A6B28 /* FeedParserError.swift */; };
 		84469D421EFF2B2D004A6B28 /* JSONTypes.swift in Sources */ = {isa = PBXBuildFile; fileRef = 84469D411EFF2B2D004A6B28 /* JSONTypes.swift */; };
+		84469D441F002CEF004A6B28 /* JSONFeedParser.swift in Sources */ = {isa = PBXBuildFile; fileRef = 84469D431F002CEF004A6B28 /* JSONFeedParser.swift */; };
 		84D81BDC1EFA28E700652332 /* RSParser.h in Headers */ = {isa = PBXBuildFile; fileRef = 84D81BDA1EFA28E700652332 /* RSParser.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		84D81BDE1EFA2B7D00652332 /* ParsedFeed.swift in Sources */ = {isa = PBXBuildFile; fileRef = 84D81BDD1EFA2B7D00652332 /* ParsedFeed.swift */; };
 		84D81BE01EFA2BAE00652332 /* FeedType.swift in Sources */ = {isa = PBXBuildFile; fileRef = 84D81BDF1EFA2BAE00652332 /* FeedType.swift */; };
@@ -115,6 +116,7 @@
 		84469D371EFF2645004A6B28 /* RSSInJSONParser.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = RSSInJSONParser.swift; path = Feeds/JSON/RSSInJSONParser.swift; sourceTree = "<group>"; };
 		84469D3F1EFF29A9004A6B28 /* FeedParserError.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = FeedParserError.swift; path = Feeds/FeedParserError.swift; sourceTree = "<group>"; };
 		84469D411EFF2B2D004A6B28 /* JSONTypes.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = JSONTypes.swift; path = Feeds/JSON/JSONTypes.swift; sourceTree = "<group>"; };
+		84469D431F002CEF004A6B28 /* JSONFeedParser.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = JSONFeedParser.swift; path = Feeds/JSON/JSONFeedParser.swift; sourceTree = "<group>"; };
 		84D81BD91EFA28E700652332 /* Info.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		84D81BDA1EFA28E700652332 /* RSParser.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RSParser.h; sourceTree = "<group>"; };
 		84D81BDD1EFA2B7D00652332 /* ParsedFeed.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = ParsedFeed.swift; path = Feeds/ParsedFeed.swift; sourceTree = "<group>"; };
@@ -244,6 +246,7 @@
 			children = (
 				84469D411EFF2B2D004A6B28 /* JSONTypes.swift */,
 				84469D371EFF2645004A6B28 /* RSSInJSONParser.swift */,
+				84469D431F002CEF004A6B28 /* JSONFeedParser.swift */,
 			);
 			name = JSON;
 			sourceTree = "<group>";
@@ -439,6 +442,7 @@
 				84D81BE61EFA2DFB00652332 /* ParsedAttachment.swift in Sources */,
 				84D81BDE1EFA2B7D00652332 /* ParsedFeed.swift in Sources */,
 				84D81BE81EFA2E6700652332 /* ParsedHub.swift in Sources */,
+				84469D441F002CEF004A6B28 /* JSONFeedParser.swift in Sources */,
 				84D81BE01EFA2BAE00652332 /* FeedType.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;