package main import log "github.com/cihub/seelog" import ( "bytes" "io" "io/ioutil" "net/http" "strconv" "strings" "git.gitorious.org/go-pkg/epubgo.git" "git.gitorious.org/trantor/trantor.git/database" "git.gitorious.org/trantor/trantor.git/storage" "github.com/gorilla/mux" ) type chapter struct { Label string Link string Depth int Active bool In []bool // one level in depth Out []bool // one level out depth } type readData struct { S Status Book database.Book Content string Chapters []chapter Next string Prev string Back string } func cleanHtml(html string) string { str := strings.Split(html, "", 2) if len(str) < 2 { return str[0] } return "
" + strings.Split(str[1], "")[0] + "
" } func genLink(id string, base string, link string) string { return base + id + "/" + link } func cleanLink(link string) string { for i := 0; i < len(link); i++ { if link[i] == '%' { c, _ := strconv.ParseInt(link[i+1:i+3], 16, 0) link = link[:i] + string(c) + link[i+3:] } } return link } func getNextPrev(e *epubgo.Epub, file string, id string, base string) (string, string) { spine, err := e.Spine() if err != nil { return "", "" } prev := "" next := "" for err == nil { if cleanLink(spine.URL()) == file { break } prev = spine.URL() err = spine.Next() } if err != nil { return "", "" } if prev != "" { prev = genLink(id, base, prev) } if spine.Next() == nil { next = genLink(id, base, spine.URL()) } return next, prev } func getChapters(e *epubgo.Epub, file string, id string, base string) []chapter { nav, err := e.Navigation() if err != nil { return nil } chapters := listChapters(nav, 0) for i, c := range chapters { chapters[i].Link = genLink(id, base, c.Link) if cleanLink(c.Link) == file { chapters[i].Active = true } } return chapters } func listChapters(nav *epubgo.NavigationIterator, depth int) []chapter { var chapters []chapter var err error = nil for err == nil { var c chapter c.Label = nav.Title() c.Link = nav.URL() c.Depth = depth chapters = append(chapters, c) if nav.HasChildren() { nav.In() children := listChapters(nav, depth+1) chapters = append(chapters, children...) nav.Out() } err = nav.Next() } chapters[0].In = append(chapters[0].In, true) chapters[len(chapters)-1].Out = append(chapters[len(chapters)-1].Out, true) return chapters } func readStartHandler(h handler) { id := mux.Vars(h.r)["id"] e, _ := openReadEpub(h) if e == nil { log.Warn("Open epub returns an empty file") notFound(h) return } defer e.Close() it, err := e.Spine() if err != nil { log.Warn("No spine in the epub") notFound(h) return } http.Redirect(h.w, h.r, "/read/"+id+"/"+it.URL(), http.StatusTemporaryRedirect) } func readHandler(h handler) { id := mux.Vars(h.r)["id"] file := mux.Vars(h.r)["file"] e, book := openReadEpub(h) if e == nil { notFound(h) return } defer e.Close() var data readData data.S = GetStatus(h) data.Book = book if !book.Active { data.Back = "/new/" } else { data.Back = "/book/" + id } data.Next, data.Prev = getNextPrev(e, file, id, "/read/") data.Chapters = getChapters(e, file, id, "/read/") data.Content = genLink(id, "/content/", file) loadTemplate(h.w, "read", data) } func openReadEpub(h handler) (*epubgo.Epub, database.Book) { var book database.Book id := mux.Vars(h.r)["id"] if id == "" { return nil, book } book, err := h.db.GetBookId(id) if err != nil { return nil, book } if !book.Active { if !h.sess.IsAdmin() { return nil, book } } e, err := openBook(book.Id, h.store) if err != nil { return nil, book } return e, book } func contentHandler(h handler) { vars := mux.Vars(h.r) id := vars["id"] file := vars["file"] if file == "" || id == "" { notFound(h) return } book, err := h.db.GetBookId(id) if err != nil { notFound(h) return } if !book.Active { if !h.sess.IsAdmin() { notFound(h) return } } e, err := openBook(book.Id, h.store) if err != nil { notFound(h) return } defer e.Close() html, err := e.OpenFile(file) if err != nil { notFound(h) return } defer html.Close() io.Copy(h.w, html) } func openBook(id string, store *storage.Store) (*epubgo.Epub, error) { f, err := store.Get(id, EPUB_FILE) if err != nil { return nil, err } defer f.Close() buff, err := ioutil.ReadAll(f) reader := bytes.NewReader(buff) return epubgo.Load(reader, int64(len(buff))) }