feat: support JSON Feed 1.1 closes #91 (#104)

## What type of PR is this? (check all applicable)

- [x] Feature

## Description

## Related Tickets & Documents
closes #91

## Added/updated tests?

- [x] Yes

README.md

@@ -17,7 +17,7 @@ applications.
 
 [atom]: https://tools.ietf.org/html/rfc4287
 [rss]: http://www.rssboard.org/rss-specification
-[jsonfeed]: https://jsonfeed.org/version/1
+[jsonfeed]: https://jsonfeed.org/version/1.1
 
 ### Usage
 
@@ -151,13 +151,18 @@ Outputs:
 </rss>
 
 {
-  "version": "https://jsonfeed.org/version/1",
+  "version": "https://jsonfeed.org/version/1.1",
   "title": "jmoiron.net blog",
   "home_page_url": "http://jmoiron.net/blog",
   "description": "discussion about tech, footie, photos",
   "author": {
     "name": "Jason Moiron"
   },
+  "authors": [
+    {
+      "name": "Jason Moiron"
+    }
+  ],
   "items": [
     {
       "id": "",
@@ -167,7 +172,12 @@ Outputs:
       "date_published": "2013-01-16T03:22:24.530817846-05:00",
       "author": {
         "name": "Jason Moiron"
-      }
+      },
+      "authors": [
+        {
+          "name": "Jason Moiron"
+        }
+      ]
     },
     {
       "id": "",

feed_test.go

@@ -121,13 +121,18 @@ var rssOutput = `<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:
 </rss>`
 
 var jsonOutput = `{
-  "version": "https://jsonfeed.org/version/1",
+  "version": "https://jsonfeed.org/version/1.1",
   "title": "jmoiron.net blog",
   "home_page_url": "http://jmoiron.net/blog",
   "description": "discussion about tech, footie, photos",
   "author": {
     "name": "Jason Moiron"
   },
+  "authors": [
+    {
+      "name": "Jason Moiron"
+    }
+  ],
   "items": [
     {
       "id": "",
@@ -138,7 +143,12 @@ var jsonOutput = `{
       "date_published": "2013-01-16T21:52:35-05:00",
       "author": {
         "name": "Jason Moiron"
-      }
+      },
+      "authors": [
+        {
+          "name": "Jason Moiron"
+        }
+      ]
     },
     {
       "id": "",
@@ -369,13 +379,18 @@ var rssOutputSorted = `<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"
 </rss>`
 
 var jsonOutputSorted = `{
-  "version": "https://jsonfeed.org/version/1",
+  "version": "https://jsonfeed.org/version/1.1",
   "title": "jmoiron.net blog",
   "home_page_url": "http://jmoiron.net/blog",
   "description": "discussion about tech, footie, photos",
   "author": {
     "name": "Jason Moiron"
   },
+  "authors": [
+    {
+      "name": "Jason Moiron"
+    }
+  ],
   "items": [
     {
       "id": "",
@@ -572,7 +587,7 @@ func TestJSONHub(t *testing.T) {
 		Version: "https://jsonfeed.org/version/1",
 		Title:   "feed title",
 		Hubs: []*JSONHub{
-			&JSONHub{
+			{
 				Type: "WebSub",
 				Url:  "https://websub-hub.example",
 			},

json.go

@@ -6,7 +6,7 @@ import (
 	"time"
 )
 
-const jsonFeedVersion = "https://jsonfeed.org/version/1"
+const jsonFeedVersion = "https://jsonfeed.org/version/1.1"
 
 // JSONAuthor represents the author of the feed or of an individual item
 // in the feed
@@ -77,7 +77,8 @@ type JSONItem struct {
 	BannerImage   string           `json:"banner_,omitempty"`
 	PublishedDate *time.Time       `json:"date_published,omitempty"`
 	ModifiedDate  *time.Time       `json:"date_modified,omitempty"`
-	Author        *JSONAuthor      `json:"author,omitempty"`
+	Author        *JSONAuthor      `json:"author,omitempty"` // deprecated in JSON Feed v1.1, keeping for backwards compatibility
+	Authors       []*JSONAuthor    `json:"authors,omitempty"`
 	Tags          []string         `json:"tags,omitempty"`
 	Attachments   []JSONAttachment `json:"attachments,omitempty"`
 }
@@ -92,19 +93,21 @@ type JSONHub struct {
 // JSONFeed represents a syndication feed in the JSON Feed Version 1 format.
 // Matching the specification found here: https://jsonfeed.org/version/1.
 type JSONFeed struct {
-	Version     string      `json:"version"`
-	Title       string      `json:"title"`
-	HomePageUrl string      `json:"home_page_url,omitempty"`
-	FeedUrl     string      `json:"feed_url,omitempty"`
-	Description string      `json:"description,omitempty"`
-	UserComment string      `json:"user_comment,omitempty"`
-	NextUrl     string      `json:"next_url,omitempty"`
-	Icon        string      `json:"icon,omitempty"`
-	Favicon     string      `json:"favicon,omitempty"`
-	Author      *JSONAuthor `json:"author,omitempty"`
-	Expired     *bool       `json:"expired,omitempty"`
-	Hubs        []*JSONHub  `json:"hubs,omitempty"`
-	Items       []*JSONItem `json:"items,omitempty"`
+	Version     string        `json:"version"`
+	Title       string        `json:"title"`
+	Language    string        `json:"language,omitempty"`
+	HomePageUrl string        `json:"home_page_url,omitempty"`
+	FeedUrl     string        `json:"feed_url,omitempty"`
+	Description string        `json:"description,omitempty"`
+	UserComment string        `json:"user_comment,omitempty"`
+	NextUrl     string        `json:"next_url,omitempty"`
+	Icon        string        `json:"icon,omitempty"`
+	Favicon     string        `json:"favicon,omitempty"`
+	Author      *JSONAuthor   `json:"author,omitempty"` // deprecated in JSON Feed v1.1, keeping for backwards compatibility
+	Authors     []*JSONAuthor `json:"authors,omitempty"`
+	Expired     *bool         `json:"expired,omitempty"`
+	Hubs        []*JSONHub    `json:"hubs,omitempty"`
+	Items       []*JSONItem   `json:"items,omitempty"`
 }
 
 // JSON is used to convert a generic Feed to a JSONFeed.
@@ -139,9 +142,11 @@ func (f *JSON) JSONFeed() *JSONFeed {
 		feed.HomePageUrl = f.Link.Href
 	}
 	if f.Author != nil {
-		feed.Author = &JSONAuthor{
+		author := &JSONAuthor{
 			Name: f.Author.Name,
 		}
+		feed.Author = author
+		feed.Authors = []*JSONAuthor{author}
 	}
 	for _, e := range f.Items {
 		feed.Items = append(feed.Items, newJSONItem(e))
@@ -165,9 +170,11 @@ func newJSONItem(i *Item) *JSONItem {
 		item.ExternalUrl = i.Source.Href
 	}
 	if i.Author != nil {
-		item.Author = &JSONAuthor{
+		author := &JSONAuthor{
 			Name: i.Author.Name,
 		}
+		item.Author = author
+		item.Authors = []*JSONAuthor{author}
 	}
 	if !i.Created.IsZero() {
 		item.PublishedDate = &i.Created