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support RSS feed generation

This commit is contained in:
Cadey Ratio 2017-03-29 00:26:50 -07:00
parent a59e48d948
commit b89387f6bb
14 changed files with 1390 additions and 0 deletions
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14
backend/christine.website/hash.go Normal file
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@ -0,0 +1,14 @@
package main
import (
"crypto/md5"
"fmt"
)
// Hash is a simple wrapper around the MD5 algorithm implementation in the
// Go standard library. It takes in data and a salt and returns the hashed
// representation.
func Hash(data string, salt string) string {
output := md5.Sum([]byte(data + salt))
return fmt.Sprintf("%x", output)
}

63
backend/christine.website/main.go
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@ -13,7 +13,9 @@ import (
"time" "time"
"github.com/Xe/asarfs" "github.com/Xe/asarfs"
"github.com/Xe/ln"
"github.com/gernest/front" "github.com/gernest/front"
"github.com/gorilla/feeds"
"github.com/urfave/negroni" "github.com/urfave/negroni"
) )
@ -155,12 +157,73 @@ func main() {
port = "9090" port = "9090"
} }
http.HandleFunc("/blog.rss", createFeed)
http.HandleFunc("/blog.atom", createAtom)
n := negroni.Classic() n := negroni.Classic()
n.UseHandler(http.DefaultServeMux) n.UseHandler(http.DefaultServeMux)
log.Fatal(http.ListenAndServe(":"+port, n)) log.Fatal(http.ListenAndServe(":"+port, n))
} }
var bootTime = time.Now()
var feed = &feeds.Feed{
Title: "Christine Dodrill's Blog",
Link: &feeds.Link{Href: "https://christine.website/blog"},
Description: "My blog posts and rants about various technology things.",
Author: &feeds.Author{Name: "Christine Dodrill", Email: "me@christine.website"},
Created: bootTime,
Copyright: "This work is copyright Christine Dodrill. My viewpoints are my own and not the view of any employer past, current or future.",
}
func init() {
for _, item := range posts {
itime, _ := time.Parse("2006-01-02", item.Date)
feed.Items = append(feed.Items, &feeds.Item{
Title: item.Title,
Link: &feeds.Link{Href: "https://christine.website/" + item.Link},
Description: item.Summary,
Created: itime,
})
}
}
// IncrediblySecureSalt *******
const IncrediblySecureSalt = "hunter2"
func createFeed(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/rss+xml")
w.Header().Set("ETag", Hash(bootTime.String(), IncrediblySecureSalt))
err := feed.WriteRss(w)
if err != nil {
http.Error(w, "Internal server error", http.StatusInternalServerError)
ln.Error(err, ln.F{
"remote_addr": r.RemoteAddr,
"action": "generating_rss",
"uri": r.RequestURI,
"host": r.Host,
})
}
}
func createAtom(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/atom+xml")
w.Header().Set("ETag", Hash(bootTime.String(), IncrediblySecureSalt))
err := feed.WriteAtom(w)
if err != nil {
http.Error(w, "Internal server error", http.StatusInternalServerError)
ln.Error(err, ln.F{
"remote_addr": r.RemoteAddr,
"action": "generating_rss",
"uri": r.RequestURI,
"host": r.Host,
})
}
}
func writeBlogPosts(w http.ResponseWriter, r *http.Request) { func writeBlogPosts(w http.ResponseWriter, r *http.Request) {
p := []interface{}{} p := []interface{}{}
for _, post := range posts { for _, post := range posts {

3
vendor-log
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@ -6,3 +6,6 @@ b68094ba95c055dfda888baa8947dfe44c20b1ac github.com/Xe/asarfs
5e4d0891fe789f2da0c2d5afada3b6a1ede6d64c layeh.com/asar 5e4d0891fe789f2da0c2d5afada3b6a1ede6d64c layeh.com/asar
3f7ce7b928e14ff890b067e5bbbc80af73690a9c github.com/urfave/negroni 3f7ce7b928e14ff890b067e5bbbc80af73690a9c github.com/urfave/negroni
f3687a5cd8e600f93e02174f5c0b91b56d54e8d0 github.com/Xe/gopreload f3687a5cd8e600f93e02174f5c0b91b56d54e8d0 github.com/Xe/gopreload
49bd2f58881c34d534aa97bd64bdbdf37be0df91 github.com/Xe/ln
441264de03a8117ed530ae8e049d8f601a33a099 github.com/gorilla/feeds
ff09b135c25aae272398c51a07235b90a75aa4f0 github.com/pkg/errors

66
vendor/github.com/Xe/ln/filter.go generated vendored Normal file
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@ -0,0 +1,66 @@
package ln
import (
"io"
"sync"
)
// Filter interface for defining chain filters
type Filter interface {
Apply(Event) bool
Run()
Close()
}
// FilterFunc allows simple functions to implement the Filter interface
type FilterFunc func(e Event) bool
// Apply implements the Filter interface
func (ff FilterFunc) Apply(e Event) bool {
return ff(e)
}
// Run implements the Filter interface
func (ff FilterFunc) Run() {}
// Close implements the Filter interface
func (ff FilterFunc) Close() {}
// WriterFilter implements a filter, which arbitrarily writes to an io.Writer
type WriterFilter struct {
sync.Mutex
Out io.Writer
Formatter Formatter
}
// NewWriterFilter creates a filter to add to the chain
func NewWriterFilter(out io.Writer, format Formatter) *WriterFilter {
if format == nil {
format = DefaultFormatter
}
return &WriterFilter{
Out: out,
Formatter: format,
}
}
// Apply implements the Filter interface
func (w *WriterFilter) Apply(e Event) bool {
output, err := w.Formatter.Format(e)
if err == nil {
w.Lock()
w.Out.Write(output)
w.Unlock()
}
return true
}
// Run implements the Filter interface
func (w *WriterFilter) Run() {}
// Close implements the Filter interface
func (w *WriterFilter) Close() {}
// NilFilter is safe to return as a Filter, but does nothing
var NilFilter = FilterFunc(func(e Event) bool { return true })

100
vendor/github.com/Xe/ln/formatter.go generated vendored Normal file
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@ -0,0 +1,100 @@
package ln
import (
"bytes"
"fmt"
"time"
)
var (
// DefaultTimeFormat represents the way in which time will be formatted by default
DefaultTimeFormat = time.RFC3339
)
// Formatter defines the formatting of events
type Formatter interface {
Format(Event) ([]byte, error)
}
// DefaultFormatter is the default way in which to format events
var DefaultFormatter Formatter
func init() {
DefaultFormatter = NewTextFormatter()
}
// TextFormatter formats events as key value pairs.
// Any remaining text not wrapped in an instance of `F` will be
// placed at the end.
type TextFormatter struct {
TimeFormat string
}
// NewTextFormatter returns a Formatter that outputs as text.
func NewTextFormatter() Formatter {
return &TextFormatter{TimeFormat: DefaultTimeFormat}
}
// Format implements the Formatter interface
func (t *TextFormatter) Format(e Event) ([]byte, error) {
var writer bytes.Buffer
writer.WriteString("time=\"")
writer.WriteString(e.Time.Format(t.TimeFormat))
writer.WriteString("\"")
for k, v := range e.Data {
writer.WriteByte(' ')
if shouldQuote(k) {
writer.WriteString(fmt.Sprintf("%q", k))
} else {
writer.WriteString(k)
}
writer.WriteByte('=')
switch v.(type) {
case string:
vs, _ := v.(string)
if shouldQuote(vs) {
fmt.Fprintf(&writer, "%q", vs)
} else {
writer.WriteString(vs)
}
case error:
tmperr, _ := v.(error)
es := tmperr.Error()
if shouldQuote(es) {
fmt.Fprintf(&writer, "%q", es)
} else {
writer.WriteString(es)
}
case time.Time:
tmptime, _ := v.(time.Time)
writer.WriteString(tmptime.Format(time.RFC3339))
default:
fmt.Fprint(&writer, v)
}
}
if len(e.Message) > 0 {
fmt.Fprintf(&writer, " _msg=%q", e.Message)
}
writer.WriteByte('\n')
return writer.Bytes(), nil
}
func shouldQuote(s string) bool {
for _, b := range s {
if !((b >= 'A' && b <= 'Z') ||
(b >= 'a' && b <= 'z') ||
(b >= '0' && b <= '9') ||
(b == '-' || b == '.' || b == '#' ||
b == '/' || b == '_')) {
return true
}
}
return false
}

141
vendor/github.com/Xe/ln/logger.go generated vendored Normal file
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@ -0,0 +1,141 @@
package ln
import (
"fmt"
"os"
"time"
"github.com/pkg/errors"
)
// Logger holds the current priority and list of filters
type Logger struct {
Filters []Filter
}
// DefaultLogger is the default implementation of Logger
var DefaultLogger *Logger
func init() {
var defaultFilters []Filter
// Default to STDOUT for logging, but allow LN_OUT to change it.
out := os.Stdout
if os.Getenv("LN_OUT") == "<stderr>" {
out = os.Stderr
}
defaultFilters = append(defaultFilters, NewWriterFilter(out, nil))
DefaultLogger = &Logger{
Filters: defaultFilters,
}
}
// F is a key-value mapping for structured data.
type F map[string]interface{}
type Fer interface {
F() map[string]interface{}
}
// Event represents an event
type Event struct {
Time time.Time
Data F
Message string
}
// Log is the generic logging method.
func (l *Logger) Log(xs ...interface{}) {
var bits []interface{}
event := Event{Time: time.Now()}
addF := func(bf F) {
if event.Data == nil {
event.Data = bf
} else {
for k, v := range bf {
event.Data[k] = v
}
}
}
// Assemble the event
for _, b := range xs {
if bf, ok := b.(F); ok {
addF(bf)
} else if fer, ok := b.(Fer); ok {
addF(F(fer.F()))
} else {
bits = append(bits, b)
}
}
event.Message = fmt.Sprint(bits...)
if os.Getenv("LN_DEBUG_ALL_EVENTS") == "1" {
frame := callersFrame()
if event.Data == nil {
event.Data = make(F)
}
event.Data["_lineno"] = frame.lineno
event.Data["_function"] = frame.function
event.Data["_filename"] = frame.filename
}
l.filter(event)
}
func (l *Logger) filter(e Event) {
for _, f := range l.Filters {
if !f.Apply(e) {
return
}
}
}
// Error logs an error and information about the context of said error.
func (l *Logger) Error(err error, xs ...interface{}) {
data := F{}
frame := callersFrame()
data["_lineno"] = frame.lineno
data["_function"] = frame.function
data["_filename"] = frame.filename
data["err"] = err
cause := errors.Cause(err)
if cause != nil {
data["cause"] = cause.Error()
}
xs = append(xs, data)
l.Log(xs...)
}
// Fatal logs this set of values, then exits with status code 1.
func (l *Logger) Fatal(xs ...interface{}) {
l.Log(xs...)
os.Exit(1)
}
// Default Implementation
// Log is the generic logging method.
func Log(xs ...interface{}) {
DefaultLogger.Log(xs...)
}
// Error logs an error and information about the context of said error.
func Error(err error, xs ...interface{}) {
DefaultLogger.Error(err, xs...)
}
// Fatal logs this set of values, then exits with status code 1.
func Fatal(xs ...interface{}) {
DefaultLogger.Fatal(xs...)
}

44
vendor/github.com/Xe/ln/stack.go generated vendored Normal file
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@ -0,0 +1,44 @@
package ln
import (
"os"
"runtime"
"strings"
)
type frame struct {
filename string
function string
lineno int
}
// skips 2 frames, since Caller returns the current frame, and we need
// the caller's caller.
func callersFrame() frame {
var out frame
pc, file, line, ok := runtime.Caller(3)
if !ok {
return out
}
srcLoc := strings.LastIndex(file, "/src/")
if srcLoc >= 0 {
file = file[srcLoc+5:]
}
out.filename = file
out.function = functionName(pc)
out.lineno = line
return out
}
func functionName(pc uintptr) string {
fn := runtime.FuncForPC(pc)
if fn == nil {
return "???"
}
name := fn.Name()
beg := strings.LastIndex(name, string(os.PathSeparator))
return name[beg+1:]
// end := strings.LastIndex(name, string(os.PathSeparator))
// return name[end+1 : len(name)]
}

163
vendor/github.com/gorilla/feeds/atom.go generated vendored Normal file
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@ -0,0 +1,163 @@
package feeds
import (
"encoding/xml"
"fmt"
"net/url"
"strconv"
"time"
)
// Generates Atom feed as XML
const ns = "http://www.w3.org/2005/Atom"
type AtomPerson struct {
Name string `xml:"name,omitempty"`
Uri string `xml:"uri,omitempty"`
Email string `xml:"email,omitempty"`
}
type AtomSummary struct {
XMLName xml.Name `xml:"summary"`
Content string `xml:",chardata"`
Type string `xml:"type,attr"`
}
type AtomContent struct {
XMLName xml.Name `xml:"content"`
Content string `xml:",chardata"`
Type string `xml:"type,attr"`
}
type AtomAuthor struct {
XMLName xml.Name `xml:"author"`
AtomPerson
}
type AtomContributor struct {
XMLName xml.Name `xml:"contributor"`
AtomPerson
}
type AtomEntry struct {
XMLName xml.Name `xml:"entry"`
Xmlns string `xml:"xmlns,attr,omitempty"`
Title string `xml:"title"` // required
Updated string `xml:"updated"` // required
Id string `xml:"id"` // required
Category string `xml:"category,omitempty"`
Content *AtomContent
Rights string `xml:"rights,omitempty"`
Source string `xml:"source,omitempty"`
Published string `xml:"published,omitempty"`
Contributor *AtomContributor
Link *AtomLink // required if no child 'content' elements
Summary *AtomSummary // required if content has src or content is base64
Author *AtomAuthor // required if feed lacks an author
}
type AtomLink struct {
//Atom 1.0 <link rel="enclosure" type="audio/mpeg" title="MP3" href="http://www.example.org/myaudiofile.mp3" length="1234" />
XMLName xml.Name `xml:"link"`
Href string `xml:"href,attr"`
Rel string `xml:"rel,attr,omitempty"`
Type string `xml:"type,attr,omitempty"`
Length string `xml:"length,attr,omitempty"`
}
type AtomFeed struct {
XMLName xml.Name `xml:"feed"`
Xmlns string `xml:"xmlns,attr"`
Title string `xml:"title"` // required
Id string `xml:"id"` // required
Updated string `xml:"updated"` // required
Category string `xml:"category,omitempty"`
Icon string `xml:"icon,omitempty"`
Logo string `xml:"logo,omitempty"`
Rights string `xml:"rights,omitempty"` // copyright used
Subtitle string `xml:"subtitle,omitempty"`
Link *AtomLink
Author *AtomAuthor `xml:"author,omitempty"`
Contributor *AtomContributor
Entries []*AtomEntry
}
type Atom struct {
*Feed
}
func newAtomEntry(i *Item) *AtomEntry {
id := i.Id
// assume the description is html
c := &AtomContent{Content: i.Description, Type: "html"}
if len(id) == 0 {
// if there's no id set, try to create one, either from data or just a uuid
if len(i.Link.Href) > 0 && (!i.Created.IsZero() || !i.Updated.IsZero()) {
dateStr := anyTimeFormat("2006-01-02", i.Updated, i.Created)
host, path := i.Link.Href, "/invalid.html"
if url, err := url.Parse(i.Link.Href); err == nil {
host, path = url.Host, url.Path
}
id = fmt.Sprintf("tag:%s,%s:%s", host, dateStr, path)
} else {
id = "urn:uuid:" + NewUUID().String()
}
}
var name, email string
if i.Author != nil {
name, email = i.Author.Name, i.Author.Email
}
x := &AtomEntry{
Title: i.Title,
Link: &AtomLink{Href: i.Link.Href, Rel: i.Link.Rel, Type: i.Link.Type},
Content: c,
Id: id,
Updated: anyTimeFormat(time.RFC3339, i.Updated, i.Created),
}
intLength, err := strconv.ParseInt(i.Link.Length, 10, 64)
if err == nil && (intLength > 0 || i.Link.Type != "") {
i.Link.Rel = "enclosure"
x.Link = &AtomLink{Href: i.Link.Href, Rel: i.Link.Rel, Type: i.Link.Type, Length: i.Link.Length}
}
if len(name) > 0 || len(email) > 0 {
x.Author = &AtomAuthor{AtomPerson: AtomPerson{Name: name, Email: email}}
}
return x
}
// create a new AtomFeed with a generic Feed struct's data
func (a *Atom) AtomFeed() *AtomFeed {
updated := anyTimeFormat(time.RFC3339, a.Updated, a.Created)
feed := &AtomFeed{
Xmlns: ns,
Title: a.Title,
Link: &AtomLink{Href: a.Link.Href, Rel: a.Link.Rel},
Subtitle: a.Description,
Id: a.Link.Href,
Updated: updated,
Rights: a.Copyright,
}
if a.Author != nil {
feed.Author = &AtomAuthor{AtomPerson: AtomPerson{Name: a.Author.Name, Email: a.Author.Email}}
}
for _, e := range a.Items {
feed.Entries = append(feed.Entries, newAtomEntry(e))
}
return feed
}
// return an XML-Ready object for an Atom object
func (a *Atom) FeedXml() interface{} {
return a.AtomFeed()
}
// return an XML-ready object for an AtomFeed object
func (a *AtomFeed) FeedXml() interface{} {
return a
}

70
vendor/github.com/gorilla/feeds/doc.go generated vendored Normal file
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@ -0,0 +1,70 @@
/*
Syndication (feed) generator library for golang.
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.
Examples
Create a Feed and some Items in that feed using the generic interfaces:
import (
"time"
. "github.com/gorilla/feeds
)
now = time.Now()
feed := &Feed{
Title: "jmoiron.net blog",
Link: &Link{Href: "http://jmoiron.net/blog"},
Description: "discussion about tech, footie, photos",
Author: &Author{Name: "Jason Moiron", Email: "jmoiron@jmoiron.net"},
Created: now,
Copyright: "This work is copyright © Benjamin Button",
}
feed.Items = []*Item{
&Item{
Title: "Limiting Concurrency in Go",
Link: &Link{Href: "http://jmoiron.net/blog/limiting-concurrency-in-go/"},
Description: "A discussion on controlled parallelism in golang",
Author: &Author{Name: "Jason Moiron", Email: "jmoiron@jmoiron.net"},
Created: now,
},
&Item{
Title: "Logic-less Template Redux",
Link: &Link{Href: "http://jmoiron.net/blog/logicless-template-redux/"},
Description: "More thoughts on logicless templates",
Created: now,
},
&Item{
Title: "Idiomatic Code Reuse in Go",
Link: &Link{Href: "http://jmoiron.net/blog/idiomatic-code-reuse-in-go/"},
Description: "How to use interfaces <em>effectively</em>",
Created: now,
},
}
From here, you can output Atom or RSS versions of this feed easily
atom, err := feed.ToAtom()
rss, err := feed.ToRss()
You can also get access to the underlying objects that feeds uses to export its XML
atomFeed := &Atom{feed}.AtomFeed()
rssFeed := &Rss{feed}.RssFeed()
From here, you can modify or add each syndication's specific fields before outputting
atomFeed.Subtitle = "plays the blues"
atom, err := ToXML(atomFeed)
rssFeed.Generator = "gorilla/feeds v1.0 (github.com/gorilla/feeds)"
rss, err := ToXML(rssFeed)
*/
package feeds

106
vendor/github.com/gorilla/feeds/feed.go generated vendored Normal file
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@ -0,0 +1,106 @@
package feeds
import (
"encoding/xml"
"io"
"time"
)
type Link struct {
Href, Rel, Type, Length string
}
type Author struct {
Name, Email string
}
type Item struct {
Title string
Link *Link
Author *Author
Description string // used as description in rss, summary in atom
Id string // used as guid in rss, id in atom
Updated time.Time
Created time.Time
}
type Feed struct {
Title string
Link *Link
Description string
Author *Author
Updated time.Time
Created time.Time
Id string
Subtitle string
Items []*Item
Copyright string
}
// add a new Item to a Feed
func (f *Feed) Add(item *Item) {
f.Items = append(f.Items, item)
}
// returns the first non-zero time formatted as a string or ""
func anyTimeFormat(format string, times ...time.Time) string {
for _, t := range times {
if !t.IsZero() {
return t.Format(format)
}
}
return ""
}
// interface used by ToXML to get a object suitable for exporting XML.
type XmlFeed interface {
FeedXml() interface{}
}
// turn a feed object (either a Feed, AtomFeed, or RssFeed) into xml
// returns an error if xml marshaling fails
func ToXML(feed XmlFeed) (string, error) {
x := feed.FeedXml()
data, err := xml.MarshalIndent(x, "", " ")
if err != nil {
return "", err
}
// strip empty line from default xml header
s := xml.Header[:len(xml.Header)-1] + string(data)
return s, nil
}
// Write a feed object (either a Feed, AtomFeed, or RssFeed) as XML into
// the writer. Returns an error if XML marshaling fails.
func WriteXML(feed XmlFeed, w io.Writer) error {
x := feed.FeedXml()
// write default xml header, without the newline
if _, err := w.Write([]byte(xml.Header[:len(xml.Header)-1])); err != nil {
return err
}
e := xml.NewEncoder(w)
e.Indent("", " ")
return e.Encode(x)
}
// creates an Atom representation of this feed
func (f *Feed) ToAtom() (string, error) {
a := &Atom{f}
return ToXML(a)
}
// Writes an Atom representation of this feed to the writer.
func (f *Feed) WriteAtom(w io.Writer) error {
return WriteXML(&Atom{f}, w)
}
// creates an Rss representation of this feed
func (f *Feed) ToRss() (string, error) {
r := &Rss{f}
return ToXML(r)
}
// Writes an RSS representation of this feed to the writer.
func (f *Feed) WriteRss(w io.Writer) error {
return WriteXML(&Rss{f}, w)
}

146
vendor/github.com/gorilla/feeds/rss.go generated vendored Normal file
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@ -0,0 +1,146 @@
package feeds
// rss support
// validation done according to spec here:
// http://cyber.law.harvard.edu/rss/rss.html
import (
"encoding/xml"
"fmt"
"strconv"
"time"
)
// private wrapper around the RssFeed which gives us the <rss>..</rss> xml
type rssFeedXml struct {
XMLName xml.Name `xml:"rss"`
Version string `xml:"version,attr"`
Channel *RssFeed
}
type RssImage struct {
XMLName xml.Name `xml:"image"`
Url string `xml:"url"`
Title string `xml:"title"`
Link string `xml:"link"`
Width int `xml:"width,omitempty"`
Height int `xml:"height,omitempty"`
}
type RssTextInput struct {
XMLName xml.Name `xml:"textInput"`
Title string `xml:"title"`
Description string `xml:"description"`
Name string `xml:"name"`
Link string `xml:"link"`
}
type RssFeed struct {
XMLName xml.Name `xml:"channel"`
Title string `xml:"title"` // required
Link string `xml:"link"` // required
Description string `xml:"description"` // required
Language string `xml:"language,omitempty"`
Copyright string `xml:"copyright,omitempty"`
ManagingEditor string `xml:"managingEditor,omitempty"` // Author used
WebMaster string `xml:"webMaster,omitempty"`
PubDate string `xml:"pubDate,omitempty"` // created or updated
LastBuildDate string `xml:"lastBuildDate,omitempty"` // updated used
Category string `xml:"category,omitempty"`
Generator string `xml:"generator,omitempty"`
Docs string `xml:"docs,omitempty"`
Cloud string `xml:"cloud,omitempty"`
Ttl int `xml:"ttl,omitempty"`
Rating string `xml:"rating,omitempty"`
SkipHours string `xml:"skipHours,omitempty"`
SkipDays string `xml:"skipDays,omitempty"`
Image *RssImage
TextInput *RssTextInput
Items []*RssItem
}
type RssItem struct {
XMLName xml.Name `xml:"item"`
Title string `xml:"title"` // required
Link string `xml:"link"` // required
Description string `xml:"description"` // required
Author string `xml:"author,omitempty"`
Category string `xml:"category,omitempty"`
Comments string `xml:"comments,omitempty"`
Enclosure *RssEnclosure
Guid string `xml:"guid,omitempty"` // Id used
PubDate string `xml:"pubDate,omitempty"` // created or updated
Source string `xml:"source,omitempty"`
}
type RssEnclosure struct {
//RSS 2.0 <enclosure url="http://example.com/file.mp3" length="123456789" type="audio/mpeg" />
XMLName xml.Name `xml:"enclosure"`
Url string `xml:"url,attr"`
Length string `xml:"length,attr"`
Type string `xml:"type,attr"`
}
type Rss struct {
*Feed
}
// create a new RssItem with a generic Item struct's data
func newRssItem(i *Item) *RssItem {
item := &RssItem{
Title: i.Title,
Link: i.Link.Href,
Description: i.Description,
Guid: i.Id,
PubDate: anyTimeFormat(time.RFC1123Z, i.Created, i.Updated),
}
intLength, err := strconv.ParseInt(i.Link.Length, 10, 64)
if err == nil && (intLength > 0 || i.Link.Type != "") {
item.Enclosure = &RssEnclosure{Url: i.Link.Href, Type: i.Link.Type, Length: i.Link.Length}
}
if i.Author != nil {
item.Author = i.Author.Name
}
return item
}
// create a new RssFeed with a generic Feed struct's data
func (r *Rss) RssFeed() *RssFeed {
pub := anyTimeFormat(time.RFC1123Z, r.Created, r.Updated)
build := anyTimeFormat(time.RFC1123Z, r.Updated)
author := ""
if r.Author != nil {
author = r.Author.Email
if len(r.Author.Name) > 0 {
author = fmt.Sprintf("%s (%s)", r.Author.Email, r.Author.Name)
}
}
channel := &RssFeed{
Title: r.Title,
Link: r.Link.Href,
Description: r.Description,
ManagingEditor: author,
PubDate: pub,
LastBuildDate: build,
Copyright: r.Copyright,
}
for _, i := range r.Items {
channel.Items = append(channel.Items, newRssItem(i))
}
return channel
}
// return an XML-Ready object for an Rss object
func (r *Rss) FeedXml() interface{} {
// only generate version 2.0 feeds for now
return r.RssFeed().FeedXml()
}
// return an XML-ready object for an RssFeed object
func (r *RssFeed) FeedXml() interface{} {
return &rssFeedXml{Version: "2.0", Channel: r}
}

27
vendor/github.com/gorilla/feeds/uuid.go generated vendored Normal file
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package feeds
// relevant bits from https://github.com/abneptis/GoUUID/blob/master/uuid.go
import (
"crypto/rand"
"fmt"
)
type UUID [16]byte
// create a new uuid v4
func NewUUID() *UUID {
u := &UUID{}
_, err := rand.Read(u[:16])
if err != nil {
panic(err)
}
u[8] = (u[8] | 0x80) & 0xBf
u[6] = (u[6] | 0x40) & 0x4f
return u
}
func (u *UUID) String() string {
return fmt.Sprintf("%x-%x-%x-%x-%x", u[:4], u[4:6], u[6:8], u[8:10], u[10:])
}

269
vendor/github.com/pkg/errors/errors.go generated vendored Normal file
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// Package errors provides simple error handling primitives.
//
// The traditional error handling idiom in Go is roughly akin to
//
// if err != nil {
// return err
// }
//
// which applied recursively up the call stack results in error reports
// without context or debugging information. The errors package allows
// programmers to add context to the failure path in their code in a way
// that does not destroy the original value of the error.
//
// Adding context to an error
//
// The errors.Wrap function returns a new error that adds context to the
// original error by recording a stack trace at the point Wrap is called,
// and the supplied message. For example
//
// _, err := ioutil.ReadAll(r)
// if err != nil {
// return errors.Wrap(err, "read failed")
// }
//
// If additional control is required the errors.WithStack and errors.WithMessage
// functions destructure errors.Wrap into its component operations of annotating
// an error with a stack trace and an a message, respectively.
//
// Retrieving the cause of an error
//
// Using errors.Wrap constructs a stack of errors, adding context to the
// preceding error. Depending on the nature of the error it may be necessary
// to reverse the operation of errors.Wrap to retrieve the original error
// for inspection. Any error value which implements this interface
//
// type causer interface {
// Cause() error
// }
//
// can be inspected by errors.Cause. errors.Cause will recursively retrieve
// the topmost error which does not implement causer, which is assumed to be
// the original cause. For example:
//
// switch err := errors.Cause(err).(type) {
// case *MyError:
// // handle specifically
// default:
// // unknown error
// }
//
// causer interface is not exported by this package, but is considered a part
// of stable public API.
//
// Formatted printing of errors
//
// All error values returned from this package implement fmt.Formatter and can
// be formatted by the fmt package. The following verbs are supported
//
// %s print the error. If the error has a Cause it will be
// printed recursively
// %v see %s
// %+v extended format. Each Frame of the error's StackTrace will
// be printed in detail.
//
// Retrieving the stack trace of an error or wrapper
//
// New, Errorf, Wrap, and Wrapf record a stack trace at the point they are
// invoked. This information can be retrieved with the following interface.
//
// type stackTracer interface {
// StackTrace() errors.StackTrace
// }
//
// Where errors.StackTrace is defined as
//
// type StackTrace []Frame
//
// The Frame type represents a call site in the stack trace. Frame supports
// the fmt.Formatter interface that can be used for printing information about
// the stack trace of this error. For example:
//
// if err, ok := err.(stackTracer); ok {
// for _, f := range err.StackTrace() {
// fmt.Printf("%+s:%d", f)
// }
// }
//
// stackTracer interface is not exported by this package, but is considered a part
// of stable public API.
//
// See the documentation for Frame.Format for more details.
package errors
import (
"fmt"
"io"
)
// New returns an error with the supplied message.
// New also records the stack trace at the point it was called.
func New(message string) error {
return &fundamental{
msg: message,
stack: callers(),
}
}
// Errorf formats according to a format specifier and returns the string
// as a value that satisfies error.
// Errorf also records the stack trace at the point it was called.
func Errorf(format string, args ...interface{}) error {
return &fundamental{
msg: fmt.Sprintf(format, args...),
stack: callers(),
}
}
// fundamental is an error that has a message and a stack, but no caller.
type fundamental struct {
msg string
*stack
}
func (f *fundamental) Error() string { return f.msg }
func (f *fundamental) Format(s fmt.State, verb rune) {
switch verb {
case 'v':
if s.Flag('+') {
io.WriteString(s, f.msg)
f.stack.Format(s, verb)
return
}
fallthrough
case 's':
io.WriteString(s, f.msg)
case 'q':
fmt.Fprintf(s, "%q", f.msg)
}
}
// WithStack annotates err with a stack trace at the point WithStack was called.
// If err is nil, WithStack returns nil.
func WithStack(err error) error {
if err == nil {
return nil
}
return &withStack{
err,
callers(),
}
}
type withStack struct {
error
*stack
}
func (w *withStack) Cause() error { return w.error }
func (w *withStack) Format(s fmt.State, verb rune) {
switch verb {
case 'v':
if s.Flag('+') {
fmt.Fprintf(s, "%+v", w.Cause())
w.stack.Format(s, verb)
return
}
fallthrough
case 's':
io.WriteString(s, w.Error())
case 'q':
fmt.Fprintf(s, "%q", w.Error())
}
}
// Wrap returns an error annotating err with a stack trace
// at the point Wrap is called, and the supplied message.
// If err is nil, Wrap returns nil.
func Wrap(err error, message string) error {
if err == nil {
return nil
}
err = &withMessage{
cause: err,
msg: message,
}
return &withStack{
err,
callers(),
}
}
// Wrapf returns an error annotating err with a stack trace
// at the point Wrapf is call, and the format specifier.
// If err is nil, Wrapf returns nil.
func Wrapf(err error, format string, args ...interface{}) error {
if err == nil {
return nil
}
err = &withMessage{
cause: err,
msg: fmt.Sprintf(format, args...),
}
return &withStack{
err,
callers(),
}
}
// WithMessage annotates err with a new message.
// If err is nil, WithMessage returns nil.
func WithMessage(err error, message string) error {
if err == nil {
return nil
}
return &withMessage{
cause: err,
msg: message,
}
}
type withMessage struct {
cause error
msg string
}
func (w *withMessage) Error() string { return w.msg + ": " + w.cause.Error() }
func (w *withMessage) Cause() error { return w.cause }
func (w *withMessage) Format(s fmt.State, verb rune) {
switch verb {
case 'v':
if s.Flag('+') {
fmt.Fprintf(s, "%+v\n", w.Cause())
io.WriteString(s, w.msg)
return
}
fallthrough
case 's', 'q':
io.WriteString(s, w.Error())
}
}
// Cause returns the underlying cause of the error, if possible.
// An error value has a cause if it implements the following
// interface:
//
// type causer interface {
// Cause() error
// }
//
// If the error does not implement Cause, the original error will
// be returned. If the error is nil, nil will be returned without further
// investigation.
func Cause(err error) error {
type causer interface {
Cause() error
}
for err != nil {
cause, ok := err.(causer)
if !ok {
break
}
err = cause.Cause()
}
return err
}

178
vendor/github.com/pkg/errors/stack.go generated vendored Normal file
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package errors
import (
"fmt"
"io"
"path"
"runtime"
"strings"
)
// Frame represents a program counter inside a stack frame.
type Frame uintptr
// pc returns the program counter for this frame;
// multiple frames may have the same PC value.
func (f Frame) pc() uintptr { return uintptr(f) - 1 }
// file returns the full path to the file that contains the
// function for this Frame's pc.
func (f Frame) file() string {
fn := runtime.FuncForPC(f.pc())
if fn == nil {
return "unknown"
}
file, _ := fn.FileLine(f.pc())
return file
}
// line returns the line number of source code of the
// function for this Frame's pc.
func (f Frame) line() int {
fn := runtime.FuncForPC(f.pc())
if fn == nil {
return 0
}
_, line := fn.FileLine(f.pc())
return line
}
// Format formats the frame according to the fmt.Formatter interface.
//
// %s source file
// %d source line
// %n function name
// %v equivalent to %s:%d
//
// Format accepts flags that alter the printing of some verbs, as follows:
//
// %+s path of source file relative to the compile time GOPATH
// %+v equivalent to %+s:%d
func (f Frame) Format(s fmt.State, verb rune) {
switch verb {
case 's':
switch {
case s.Flag('+'):
pc := f.pc()
fn := runtime.FuncForPC(pc)
if fn == nil {
io.WriteString(s, "unknown")
} else {
file, _ := fn.FileLine(pc)
fmt.Fprintf(s, "%s\n\t%s", fn.Name(), file)
}
default:
io.WriteString(s, path.Base(f.file()))
}
case 'd':
fmt.Fprintf(s, "%d", f.line())
case 'n':
name := runtime.FuncForPC(f.pc()).Name()
io.WriteString(s, funcname(name))
case 'v':
f.Format(s, 's')
io.WriteString(s, ":")
f.Format(s, 'd')
}
}
// StackTrace is stack of Frames from innermost (newest) to outermost (oldest).
type StackTrace []Frame
func (st StackTrace) Format(s fmt.State, verb rune) {
switch verb {
case 'v':
switch {
case s.Flag('+'):
for _, f := range st {
fmt.Fprintf(s, "\n%+v", f)
}
case s.Flag('#'):
fmt.Fprintf(s, "%#v", []Frame(st))
default:
fmt.Fprintf(s, "%v", []Frame(st))
}
case 's':
fmt.Fprintf(s, "%s", []Frame(st))
}
}
// stack represents a stack of program counters.
type stack []uintptr
func (s *stack) Format(st fmt.State, verb rune) {
switch verb {
case 'v':
switch {
case st.Flag('+'):
for _, pc := range *s {
f := Frame(pc)
fmt.Fprintf(st, "\n%+v", f)
}
}
}
}
func (s *stack) StackTrace() StackTrace {
f := make([]Frame, len(*s))
for i := 0; i < len(f); i++ {
f[i] = Frame((*s)[i])
}
return f
}
func callers() *stack {
const depth = 32
var pcs [depth]uintptr
n := runtime.Callers(3, pcs[:])
var st stack = pcs[0:n]
return &st
}
// funcname removes the path prefix component of a function's name reported by func.Name().
func funcname(name string) string {
i := strings.LastIndex(name, "/")
name = name[i+1:]
i = strings.Index(name, ".")
return name[i+1:]
}
func trimGOPATH(name, file string) string {
// Here we want to get the source file path relative to the compile time
// GOPATH. As of Go 1.6.x there is no direct way to know the compiled
// GOPATH at runtime, but we can infer the number of path segments in the
// GOPATH. We note that fn.Name() returns the function name qualified by
// the import path, which does not include the GOPATH. Thus we can trim
// segments from the beginning of the file path until the number of path
// separators remaining is one more than the number of path separators in
// the function name. For example, given:
//
// GOPATH /home/user
// file /home/user/src/pkg/sub/file.go
// fn.Name() pkg/sub.Type.Method
//
// We want to produce:
//
// pkg/sub/file.go
//
// From this we can easily see that fn.Name() has one less path separator
// than our desired output. We count separators from the end of the file
// path until it finds two more than in the function name and then move
// one character forward to preserve the initial path segment without a
// leading separator.
const sep = "/"
goal := strings.Count(name, sep) + 2
i := len(file)
for n := 0; n < goal; n++ {
i = strings.LastIndex(file[:i], sep)
if i == -1 {
// not enough separators found, set i so that the slice expression
// below leaves file unmodified
i = -len(sep)
break
}
}
// get back to 0 or trim the leading separator
file = file[i+len(sep):]
return file
}