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Adds support for JSON Feed Version 1

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JSON Feed Version 1 specification: https://jsonfeed.org/version/1
This commit is contained in:
Kevin Stock
2017-06-04 14:48:21 -07:00
parent 716510dd3f
commit e9747d9577
5 changed files with 305 additions and 6 deletions
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README.md
+43 -3
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@@ -1,13 +1,13 @@
## gorilla/feeds
[![GoDoc](https://godoc.org/github.com/gorilla/feeds?status.svg)](https://godoc.org/github.com/gorilla/feeds) [![Build Status](https://travis-ci.org/gorilla/feeds.png?branch=master)](https://travis-ci.org/gorilla/feeds)
feeds is a web feed generator library for generating RSS and Atom feeds from Go
feeds is a web feed generator library for generating RSS, Atom and JSON feeds from Go
applications.
### Goals
* Provide a simple interface to create both Atom & RSS 2.0 feeds
* Full support for Atom and RSS2.0 spec elements
* Full support for Atom, RSS2.0, and JSON Feed Version 1 spec elements
* Ability to modify particulars for each spec
### Usage
@@ -64,7 +64,12 @@ func main() {
log.Fatal(err)
}
fmt.Println(atom, "\n", rss)
json, err := feed.ToJSON()
if err != nil {
log.Fatal(err)
}
fmt.Println(atom, "\n", rss, "\n", json)
}
```
@@ -136,5 +141,40 @@ Outputs:
</channel>
</rss>
{
"version": "https://jsonfeed.org/version/1",
"title": "jmoiron.net blog",
"home_page_url": "http://jmoiron.net/blog",
"description": "discussion about tech, footie, photos",
"author": {
"name": "Jason Moiron"
},
"items": [
{
"id": "",
"url": "http://jmoiron.net/blog/limiting-concurrency-in-go/",
"title": "Limiting Concurrency in Go",
"summary": "A discussion on controlled parallelism in golang",
"date_published": "2013-01-16T03:22:24.530817846-05:00",
"author": {
"name": "Jason Moiron"
}
},
{
"id": "",
"url": "http://jmoiron.net/blog/logicless-template-redux/",
"title": "Logic-less Template Redux",
"summary": "More thoughts on logicless templates",
"date_published": "2013-01-16T03:22:24.530817846-05:00"
},
{
"id": "",
"url": "http://jmoiron.net/blog/idiomatic-code-reuse-in-go/",
"title": "Idiomatic Code Reuse in Go",
"summary": "How to use interfaces \u003cem\u003eeffectively\u003c/em\u003e",
"date_published": "2013-01-16T03:22:24.530817846-05:00"
}
]
}
```
doc.go
+6 -3
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@@ -5,7 +5,7 @@ Installing
go get github.com/gorilla/feeds
Feeds provides a simple, generic Feed interface with a generic Item object as well as RSS and Atom specific RssFeed and AtomFeed objects which allow access to all of each spec's defined elements.
Feeds provides a simple, generic Feed interface with a generic Item object as well as RSS, Atom and JSON Feed specific RssFeed, AtomFeed and JSONFeed objects which allow access to all of each spec's defined elements.
Examples
@@ -49,15 +49,17 @@ Create a Feed and some Items in that feed using the generic interfaces:
},
}
From here, you can output Atom or RSS versions of this feed easily
From here, you can output Atom, RSS, or JSON Feed versions of this feed easily
atom, err := feed.ToAtom()
rss, err := feed.ToRss()
json, err := feed.ToJSON()
You can also get access to the underlying objects that feeds uses to export its XML
atomFeed := &Atom{feed}.AtomFeed()
rssFeed := &Rss{feed}.RssFeed()
jsonFeed := &JSON{feed}.JSONFeed()
From here, you can modify or add each syndication's specific fields before outputting
@@ -65,6 +67,7 @@ From here, you can modify or add each syndication's specific fields before outpu
atom, err := ToXML(atomFeed)
rssFeed.Generator = "gorilla/feeds v1.0 (github.com/gorilla/feeds)"
rss, err := ToXML(rssFeed)
jsonFeed.NextUrl = "https://www.example.com/feed.json?page=2"
json, err := jsonFeed.ToJSON()
*/
package feeds
feed.go
+17
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@@ -1,6 +1,7 @@
package feeds
import (
"encoding/json"
"encoding/xml"
"io"
"time"
@@ -105,3 +106,19 @@ func (f *Feed) ToRss() (string, error) {
func (f *Feed) WriteRss(w io.Writer) error {
return WriteXML(&Rss{f}, w)
}
// creates an JSON representation of this feed
func (f *Feed) ToJSON() (string, error) {
j := &JSON{f}
return j.ToJSON()
}
// Writes an JSON representation of this feed to the writer.
func (f *Feed) WriteJSON(w io.Writer) error {
j := &JSON{f}
feed := j.JSONFeed()
e := json.NewEncoder(w)
e.SetIndent("", " ")
return e.Encode(feed)
}
feed_test.go
+65
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@@ -101,6 +101,56 @@ var rssOutput = `<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">
</channel>
</rss>`
var jsonOutput = `{
"version": "https://jsonfeed.org/version/1",
"title": "jmoiron.net blog",
"home_page_url": "http://jmoiron.net/blog",
"description": "discussion about tech, footie, photos",
"author": {
"name": "Jason Moiron"
},
"items": [
{
"id": "",
"url": "http://jmoiron.net/blog/limiting-concurrency-in-go/",
"title": "Limiting Concurrency in Go",
"summary": "A discussion on controlled parallelism in golang",
"date_published": "2013-01-16T21:52:35-05:00",
"author": {
"name": "Jason Moiron"
}
},
{
"id": "",
"url": "http://jmoiron.net/blog/logicless-template-redux/",
"title": "Logic-less Template Redux",
"summary": "More thoughts on logicless templates",
"date_published": "2013-01-16T21:52:35-05:00"
},
{
"id": "",
"url": "http://jmoiron.net/blog/idiomatic-code-reuse-in-go/",
"title": "Idiomatic Code Reuse in Go",
"summary": "How to use interfaces \u003cem\u003eeffectively\u003c/em\u003e",
"date_published": "2013-01-16T21:52:35-05:00"
},
{
"id": "",
"url": "http://example.com/RickRoll.mp3",
"title": "Never Gonna Give You Up Mp3",
"summary": "Never gonna give you up - Never gonna let you down.",
"date_published": "2013-01-16T21:52:35-05:00"
},
{
"id": "",
"url": "http://example.com/strings",
"title": "String formatting in Go",
"summary": "How to use things like %s, %v, %d, etc.",
"date_published": "2013-01-16T21:52:35-05:00"
}
]
}`
func TestFeed(t *testing.T) {
now, err := time.Parse(time.RFC3339, "2013-01-16T21:52:35-05:00")
if err != nil {
@@ -180,4 +230,19 @@ func TestFeed(t *testing.T) {
if got := buf.String(); got != rssOutput {
t.Errorf("Rss not what was expected. Got:\n%s\n\nExpected:\n%s\n", got, rssOutput)
}
json, err := feed.ToJSON()
if err != nil {
t.Errorf("unexpected error encoding JSON: %v", err)
}
if json != jsonOutput {
t.Errorf("JSON not what was expected. Got:\n%s\n\nExpected:\n%s\n", json, jsonOutput)
}
buf.Reset()
if err := feed.WriteJSON(&buf); err != nil {
t.Errorf("unexpected error writing JSON: %v", err)
}
if got := buf.String(); got != jsonOutput+"\n" { //json.Encode appends a newline after the JSON output: https://github.com/golang/go/commit/6f25f1d4c901417af1da65e41992d71c30f64f8f#diff-50848cbd686f250623a2ef6ddb07e157
t.Errorf("JSON not what was expected. Got:\n||%s||\n\nExpected:\n||%s||\n", got, jsonOutput)
}
}
json.go
+174
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@@ -0,0 +1,174 @@
package feeds
import (
"encoding/json"
"time"
)
const jsonFeedVersion = "https://jsonfeed.org/version/1"
// JSONAuthor represents the author of the feed or of an individual item
// in the feed
type JSONAuthor struct {
Name string `json:"name,omitempty"`
Url string `json:"url,omitempty"`
Avatar string `json:"avatar,omitempty"`
}
// JSONAttachment represents a related resource. Podcasts, for instance, would
// include an attachment that’s an audio or video file.
type JSONAttachment struct {
Url string `json:"url,omitempty"`
MIMEType string `json:"mime_type,omitempty"`
Title string `json:"title,omitempty"`
Size int32 `json:"size,omitempty"`
Duration time.Duration `json:"duration_in_seconds,omitempty"`
}
// MarshalJSON implements the json.Marshaler interface.
// The Duration field is marshaled in seconds, all other fields are marshaled
// based upon the definitions in struct tags.
func (a *JSONAttachment) MarshalJSON() ([]byte, error) {
type EmbeddedJSONAttachment JSONAttachment
return json.Marshal(&struct {
Duration float64 `json:"duration_in_seconds,omitempty"`
*EmbeddedJSONAttachment
}{
EmbeddedJSONAttachment: (*EmbeddedJSONAttachment)(a),
Duration: a.Duration.Seconds(),
})
}
// UnmarshalJSON implements the json.Unmarshaler interface.
// The Duration field is expected to be in seconds, all other field types
// match the struct definition.
func (a *JSONAttachment) UnmarshalJSON(data []byte) error {
type EmbeddedJSONAttachment JSONAttachment
var raw struct {
Duration float64 `json:"duration_in_seconds,omitempty"`
*EmbeddedJSONAttachment
}
raw.EmbeddedJSONAttachment = (*EmbeddedJSONAttachment)(a)
err := json.Unmarshal(data, &raw)
if err != nil {
return err
}
if raw.Duration > 0 {
nsec := int64(raw.Duration * float64(time.Second))
raw.EmbeddedJSONAttachment.Duration = time.Duration(nsec)
}
return nil
}
// JSONItem represents a single entry/post for the feed.
type JSONItem struct {
Id string `json:"id"`
Url string `json:"url,omitempty"`
ExternalUrl string `json:"external_url,omitempty"`
Title string `json:"title,omitempty"`
ContentHTML string `json:"content_html,omitempty"`
ContentText string `json:"content_text,omitempty"`
Summary string `json:"summary,omitempty"`
Image string `json:"image,omitempty"`
BannerImage string `json:"banner_,omitempty"`
PublishedDate *time.Time `json:"date_published,omitempty"`
ModifiedDate *time.Time `json:"date_modified,omitempty"`
Author *JSONAuthor `json:"author,omitempty"`
Tags []string `json:"tags,omitempty"`
Attachments []JSONAttachment `json:"attachments,omitempty"`
}
// JSONHub describes an endpoint that can be used to subscribe to real-time
// notifications from the publisher of this feed.
type JSONHub struct {
Type string `json:"type"`
Url string `json:"url"`
}
// 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 []*JSONItem `json:"hubs,omitempty"`
Items []*JSONItem `json:"items,omitempty"`
}
type JSON struct {
*Feed
}
func (f *JSON) ToJSON() (string, error) {
return f.JSONFeed().ToJSON()
}
func (f *JSONFeed) ToJSON() (string, error) {
data, err := json.MarshalIndent(f, "", " ")
if err != nil {
return "", err
}
return string(data), nil
}
// JSONFeed creates a new JSONFeed with a generic Feed struct's data
func (a *JSON) JSONFeed() *JSONFeed {
feed := &JSONFeed{
Version: jsonFeedVersion,
Title: a.Title,
Description: a.Description,
}
if a.Link != nil {
feed.HomePageUrl = a.Link.Href
}
if a.Author != nil {
feed.Author = &JSONAuthor{
Name: a.Author.Name,
}
}
for _, e := range a.Items {
feed.Items = append(feed.Items, newJSONItem(e))
}
return feed
}
func newJSONItem(i *Item) *JSONItem {
item := &JSONItem{
Id: i.Id,
Title: i.Title,
Summary: i.Description,
}
if i.Link != nil {
item.Url = i.Link.Href
}
if i.Source != nil {
item.ExternalUrl = i.Source.Href
}
if i.Author != nil {
item.Author = &JSONAuthor{
Name: i.Author.Name,
}
}
if !i.Created.IsZero() {
item.PublishedDate = &i.Created
}
if !i.Updated.IsZero() {
item.ModifiedDate = &i.Created
}
return item
}