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Using the a builder

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This commit is contained in:
Sinuhe Tellez 2017-05-11 19:06:21 -04:00
parent df3a7f41c6
commit 5a42df65e8
6 changed files with 286 additions and 147 deletions
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30
author_builder.go Normal file
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package main
import (
"github.com/lann/builder"
"golang.org/x/tools/blog/atom"
)
type authorBuilder builder.Builder
func (a authorBuilder) Name(name string) authorBuilder {
return builder.Set(a, "Name", name).(authorBuilder)
}
func (a authorBuilder) URI(uri string) authorBuilder {
return builder.Set(a, "URI", uri).(authorBuilder)
}
func (a authorBuilder) Email(email string) authorBuilder {
return builder.Set(a, "Email", email).(authorBuilder)
}
func (a authorBuilder) InnerXml(inner string) authorBuilder {
return builder.Set(a, "InnerXml", inner).(authorBuilder)
}
func (a authorBuilder) Build() atom.Person {
return builder.GetStruct(a).(atom.Person)
}
var AuthorBuilder = builder.Register(authorBuilder{}, atom.Person{}).(authorBuilder)

47
entry_builder.go Normal file
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package main
import (
"github.com/lann/builder"
"golang.org/x/tools/blog/atom"
"time"
)
type entryBuilder builder.Builder
func (e entryBuilder) Title(title string) entryBuilder {
return builder.Set(e, "Title", title).(entryBuilder)
}
func (e entryBuilder) Id(id string) entryBuilder {
return builder.Set(e, "ID", id).(entryBuilder)
}
func (e entryBuilder) AddLink(link atom.Link) entryBuilder {
return builder.Append(e, "Link", link).(entryBuilder)
}
func (e entryBuilder) Published(published time.Time) entryBuilder {
return builder.Set(e, "Published", atom.Time(published)).(entryBuilder)
}
func (e entryBuilder) Updated(updated time.Time) entryBuilder {
return builder.Set(e, "Updated", atom.Time(updated)).(entryBuilder)
}
func (e entryBuilder) Author(author *atom.Person) entryBuilder {
return builder.Set(e, "Author", author).(entryBuilder)
}
func (e entryBuilder) Summary(summary *atom.Text) entryBuilder {
return builder.Set(e, "Summary", summary).(entryBuilder)
}
func (e entryBuilder) Content(content *atom.Text) entryBuilder {
return builder.Set(e, "Content", content).(entryBuilder)
}
func (e entryBuilder) Build() atom.Entry {
return builder.GetStruct(e).(atom.Entry)
}
var EntryBuilder = builder.Register(entryBuilder{}, atom.Entry{}).(entryBuilder)

39
feed_builder.go Normal file
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package main
import (
"github.com/lann/builder"
"golang.org/x/tools/blog/atom"
"time"
)
type feedBuilder builder.Builder
func (f feedBuilder) Title(title string) feedBuilder {
return builder.Set(f, "Title", title).(feedBuilder)
}
func (f feedBuilder) Id(id string) feedBuilder {
return builder.Set(f, "ID", id).(feedBuilder)
}
func (f feedBuilder) AddLink(link atom.Link) feedBuilder {
return builder.Append(f, "Link", link).(feedBuilder)
}
func (f feedBuilder) Updated(updated time.Time) feedBuilder {
return builder.Set(f, "Updated", atom.Time(updated)).(feedBuilder)
}
func (f feedBuilder) Author(author atom.Person) feedBuilder {
return builder.Set(f, "Author", &author).(feedBuilder)
}
func (f feedBuilder) AddEntry(entry atom.Entry) feedBuilder {
return builder.Append(f, "Entry", &entry).(feedBuilder)
}
func (f feedBuilder) Build() atom.Feed {
return builder.GetStruct(f).(atom.Feed)
}
var FeedBuilder = builder.Register(feedBuilder{}, atom.Feed{}).(feedBuilder)

38
link_builder.go Normal file
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package main
import (
"github.com/lann/builder"
"golang.org/x/tools/blog/atom"
)
type linkBuilder builder.Builder
func (l linkBuilder) Rel(rel string) linkBuilder {
return builder.Set(l, "Rel", rel).(linkBuilder)
}
func (l linkBuilder) Href(href string) linkBuilder {
return builder.Set(l, "Href", href).(linkBuilder)
}
func (l linkBuilder) Type(typeName string) linkBuilder {
return builder.Set(l, "Type", typeName).(linkBuilder)
}
func (l linkBuilder) HrefLang(lang string) linkBuilder {
return builder.Set(l, "HrefLang", lang).(linkBuilder)
}
func (l linkBuilder) Title(title string) linkBuilder {
return builder.Set(l, "Title", title).(linkBuilder)
}
func (l linkBuilder) Length(length uint) linkBuilder {
return builder.Set(l, "Length", length).(linkBuilder)
}
func (l linkBuilder) Build() atom.Link {
return builder.GetStruct(l).(atom.Link)
}
var LinkBuilder = builder.Register(linkBuilder{}, atom.Link{}).(linkBuilder)

257
main.go
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@ -18,196 +18,159 @@
package main
import (
"bufio"
"bytes"
"encoding/xml"
"flag"
"io"
"golang.org/x/tools/blog/atom"
"io/ioutil"
"log"
"mime"
"net/http"
"net/url"
"os"
"path/filepath"
"time"
"golang.org/x/tools/blog/atom"
)
type AcquisitionFeed struct {
*atom.Feed
Dc string `xml:"xmlns:dc,attr"`
Opds string `xml:"xmlns:opds,attr"`
}
type CatalogFeed atom.Feed
const acquisitionType = "application/atom+xml;profile=opds-catalog;kind=acquisition"
const navegationType = "application/atom+xml;profile=opds-catalog;kind=navigation"
var (
port,
dirRoot,
author,
authorUri,
authorEmail string
updated atom.TimeStr
)
const acquisitionType = "application/atom+xml;profile=opds-catalog;kind=acquisition"
const navegationType = "application/atom+xml;profile=opds-catalog;kind=navigation"
type AcquisitionFeed struct {
*atom.Feed
Dc string `xml:"xmlns:dc,attr"`
Opds string `xml:"xmlns:opds,attr"`
}
func init() {
mime.AddExtensionType(".mobi", "application/x-mobipocket-ebook")
mime.AddExtensionType(".epub", "application/epub+zip")
mime.AddExtensionType(".fb2", "txt/xml")
flag.StringVar(&port, "port", "8080", "The server will listen in this port")
flag.StringVar(&dirRoot, "dir", "./books", "A directory with books")
flag.StringVar(&author, "author", "", "The author of the feed")
flag.StringVar(&authorUri, "uri", "", "The author uri")
flag.StringVar(&authorEmail, "email", "", "The author email")
flag.Parse()
updated = atom.Time(time.Now())
}
func main() {
http.HandleFunc("/", errorHandler(func(w http.ResponseWriter, req *http.Request) error {
dirPath := filepath.Join(dirRoot, req.URL.Path)
fi, err := os.Stat(dirPath)
func handler(w http.ResponseWriter, req *http.Request) error {
fpath := filepath.Join(dirRoot, req.URL.Path)
fi, err := os.Stat(fpath)
if err != nil {
return err
}
if fi.IsDir() {
content, err := getContent(w, req, fpath)
if err != nil {
return err
}
http.ServeContent(w, req, "feed.xml", time.Now(), bytes.NewReader(content))
} else {
http.ServeFile(w, req, fpath)
}
if fi.IsDir() {
w.Write([]byte(xml.Header))
return writeFeedTo(w, req.URL)
}
return nil
}
return writeFileTo(w, dirPath)
}))
func main() {
flag.StringVar(&port, "port", "8080", "The server will listen in this port")
flag.StringVar(&dirRoot, "dir", "./books", "A directory with books")
flag.StringVar(&author, "serveFeedauthor", "", "The feed's author")
flag.StringVar(&authorUri, "uri", "", "The feed's author uri")
flag.StringVar(&authorEmail, "email", "", "The feed's author email")
flag.Parse()
http.HandleFunc("/", errorHandler(handler))
log.Fatal(http.ListenAndServe(":"+port, nil))
}
func writeFeedTo(w io.Writer, u *url.URL) error {
isAcquisition, err := isAcquisitionFeed(filepath.Join(dirRoot, u.Path))
if err != nil {
return err
func getContent(w http.ResponseWriter, req *http.Request, dirpath string) (result []byte, err error) {
feed := makeFeed(dirpath, req)
if isAcquisition(dirpath) {
acFeed := &AcquisitionFeed{&feed, "http://purl.org/dc/terms/", "http://opds-spec.org/2010/catalog"}
result, err = xml.MarshalIndent(acFeed, " ", " ")
} else {
result, err = xml.MarshalIndent(feed, " ", " ")
}
if isAcquisition {
return writeAcquisitionFeed(w, u)
}
return writeCatalogFeed(w, u)
return
}
func isAcquisitionFeed(p string) (bool, error) {
fis, err := ioutil.ReadDir(p)
if err != nil {
return false, err
func makeFeed(dirpath string, req *http.Request) atom.Feed {
feedBuilder := FeedBuilder.
Id(req.URL.Path).
Title("Catalog in " + req.URL.Path).
Author(AuthorBuilder.Name(author).Email(authorEmail).URI(authorUri).Build()).
Updated(time.Now()).
AddLink(LinkBuilder.Rel("start").Href("/").Type(navegationType).Build())
fis, _ := ioutil.ReadDir(dirpath)
for _, fi := range fis {
linkIsAcquisition := isAcquisition(filepath.Join(dirpath, fi.Name()))
feedBuilder = feedBuilder.
AddEntry(EntryBuilder.
Id(req.URL.Path + fi.Name()).
Title(fi.Name()).
Updated(time.Now()).
Published(time.Now()).
AddLink(LinkBuilder.
Rel(getRel(fi.Name(), linkIsAcquisition)).
Title(fi.Name()).
Href(getHref(req, fi.Name())).
Type(getType(fi.Name(), linkIsAcquisition)).
Build()).
Build())
}
return feedBuilder.Build()
}
func getRel(name string, acquisition bool) (rel string) {
rel = "subsection"
if !acquisition {
return
}
ext := filepath.Ext(name)
if rel = "http://opds-spec.org/acquisition"; ext == ".png" || ext == ".jpg" || ext == ".jpeg" || ext == ".gift" {
rel = "http://opds-spec.org/image/thumbnail"
}
return
}
func getType(name string, acquisition bool) (linkType string) {
linkType = acquisitionType
if !acquisition {
return
}
ext := filepath.Ext(name)
linkType = mime.TypeByExtension(ext)
return
}
func getHref(req *http.Request, name string) string {
return filepath.Join(req.URL.EscapedPath(), url.PathEscape(name))
}
func isAcquisition(dirpath string) bool {
fi, _ := os.Stat(dirpath)
if !fi.IsDir() {
return false
}
fis, _ := ioutil.ReadDir(dirpath)
for _, fi := range fis {
if !fi.IsDir() {
return true, nil
return true
}
}
return false, nil
}
func writeCatalogFeed(w io.Writer, u *url.URL) error {
feed := &CatalogFeed{ID: u.Path, Title: "Catalog feed in " + u.Path}
feed.Author = &atom.Person{Name: author, Email: authorEmail, URI: authorUri}
feed.Updated = updated
feed.Link = []atom.Link{{
Rel: "start",
Href: "/",
Type: navegationType,
}}
abs_path := filepath.Join(dirRoot, u.Path)
fis, err := ioutil.ReadDir(abs_path)
if err != nil {
return err
}
for _, fi := range fis {
link := atom.Link{
Rel: "subsection",
Title: fi.Name(),
Href: filepath.Join(u.EscapedPath(), url.PathEscape(fi.Name())),
Type: acquisitionType,
}
entry := &atom.Entry{
ID: filepath.Join(u.Path, fi.Name()),
Title: fi.Name(),
Updated: updated,
Published: updated,
Link: []atom.Link{link},
}
feed.Entry = append(feed.Entry, entry)
}
enc := xml.NewEncoder(w)
enc.Indent(" ", " ")
enc.Encode(feed)
return nil
}
func writeAcquisitionFeed(w io.Writer, u *url.URL) error {
f := &atom.Feed{}
feed := &AcquisitionFeed{f, "http://purl.org/dc/terms/", "http://opds-spec.org/2010/catalog"}
feed.ID = u.Path
feed.Updated = updated
feed.Title = filepath.Base(u.Path)
feed.Author = &atom.Person{Name: author, Email: authorEmail, URI: authorUri}
feed.Link = []atom.Link{{
Rel: "start",
Href: "/",
Type: navegationType,
}}
abs_path := filepath.Join(dirRoot, u.Path)
fis, err := ioutil.ReadDir(abs_path)
if err != nil {
return err
}
entry := &atom.Entry{
ID: u.Path,
Title: filepath.Base(u.Path),
Updated: updated,
Published: updated,
}
for _, fi := range fis {
ext := filepath.Ext(fi.Name())
mime_type := mime.TypeByExtension(ext)
var rel string
if rel = "http://opds-spec.org/acquisition"; ext == ".png" || ext == ".jpg" || ext == ".jpeg" || ext == ".gift" {
rel = "http://opds-spec.org/image/thumbnail"
}
link := atom.Link{
Title: fi.Name(),
Rel: rel,
Type: mime_type,
Href: filepath.Join(u.EscapedPath(), url.PathEscape(fi.Name())),
}
entry.Link = append(entry.Link, link)
}
feed.Entry = append(feed.Entry, entry)
enc := xml.NewEncoder(w)
enc.Indent(" ", " ")
enc.Encode(feed)
return nil
}
func writeFileTo(w io.Writer, p string) error {
f, err := os.Open(p)
if err != nil {
return err
}
defer f.Close()
r := bufio.NewReader(f)
r.WriteTo(w)
return nil
return false
}
func errorHandler(f func(http.ResponseWriter, *http.Request) error) http.HandlerFunc {

22
text_builder.go Normal file
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package main
import (
"github.com/lann/builder"
"golang.org/x/tools/blog/atom"
)
type textBuilder builder.Builder
func (t textBuilder) Type(textType string) textBuilder {
return builder.Set(t, "Type", textType).(textBuilder)
}
func (t textBuilder) Body(body string) textBuilder {
return builder.Set(t, "Body", body).(textBuilder)
}
func (t textBuilder) Build() atom.Text {
return builder.GetStruct(t).(atom.Text)
}
var TextBuilder = builder.Register(textBuilder{}, atom.Text{}).(textBuilder)