forked from trantor-library/trantor
/
cover.go
190 lines (169 loc) · 4.09 KB
/
cover.go
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package main
import (
_ "image/gif"
_ "image/jpeg"
_ "image/png"
log "github.com/cihub/seelog"
"bytes"
"image"
"image/jpeg"
"io"
"io/ioutil"
"regexp"
"strings"
"git.gitorious.org/go-pkg/epubgo.git"
"git.gitorious.org/trantor/trantor.git/storage"
"github.com/gorilla/mux"
"github.com/nfnt/resize"
)
func coverHandler(h handler) {
vars := mux.Vars(h.r)
book, err := h.db.GetBookId(vars["id"])
if err != nil {
notFound(h)
return
}
if !book.Active {
if !h.sess.IsAdmin() {
notFound(h)
return
}
}
file := COVER_FILE
if vars["size"] == "small" {
file = COVER_SMALL_FILE
}
f, err := h.store.Get(book.Id, file)
if err != nil {
log.Error("Error while opening image: ", err)
notFound(h)
return
}
defer f.Close()
headers := h.w.Header()
headers["Content-Type"] = []string{"image/jpeg"}
_, err = io.Copy(h.w, f)
if err != nil {
log.Error("Error while copying image: ", err)
notFound(h)
return
}
}
func GetCover(e *epubgo.Epub, id string, store *storage.Store) bool {
if coverFromMetadata(e, id, store) {
return true
}
if searchCommonCoverNames(e, id, store) {
return true
}
/* search for img on the text */
exp, _ := regexp.Compile("<.*ima?g.*[(src)(href)]=[\"']([^\"']*(\\.[^\\.\"']*))[\"']")
it, errNext := e.Spine()
for errNext == nil {
file, err := it.Open()
if err != nil {
break
}
defer file.Close()
txt, err := ioutil.ReadAll(file)
if err != nil {
break
}
res := exp.FindSubmatch(txt)
if res != nil {
href := string(res[1])
urlPart := strings.Split(it.URL(), "/")
url := strings.Join(urlPart[:len(urlPart)-1], "/")
if href[:3] == "../" {
href = href[3:]
url = strings.Join(urlPart[:len(urlPart)-2], "/")
}
href = strings.Replace(href, "%20", " ", -1)
href = strings.Replace(href, "%27", "'", -1)
href = strings.Replace(href, "%28", "(", -1)
href = strings.Replace(href, "%29", ")", -1)
if url == "" {
url = href
} else {
url = url + "/" + href
}
img, err := e.OpenFile(url)
if err == nil {
defer img.Close()
return storeImg(img, id, store)
}
}
errNext = it.Next()
}
return false
}
func coverFromMetadata(e *epubgo.Epub, id string, store *storage.Store) bool {
metaList, _ := e.MetadataAttr("meta")
for _, meta := range metaList {
if meta["name"] == "cover" {
img, err := e.OpenFileId(meta["content"])
if err == nil {
defer img.Close()
return storeImg(img, id, store)
}
}
}
return false
}
func searchCommonCoverNames(e *epubgo.Epub, id string, store *storage.Store) bool {
for _, p := range []string{"cover.jpg", "Images/cover.jpg", "images/cover.jpg", "cover.jpeg", "cover1.jpg", "cover1.jpeg"} {
img, err := e.OpenFile(p)
if err == nil {
defer img.Close()
return storeImg(img, id, store)
}
}
return false
}
func storeImg(img io.Reader, id string, store *storage.Store) bool {
/* open the files */
fBig, err := store.Create(id, COVER_FILE)
if err != nil {
log.Error("Error creating cover ", id, ": ", err.Error())
return false
}
defer fBig.Close()
fSmall, err := store.Create(id, COVER_SMALL_FILE)
if err != nil {
log.Error("Error creating small cover ", id, ": ", err.Error())
return false
}
defer fSmall.Close()
/* resize img */
var img2 bytes.Buffer
img1 := io.TeeReader(img, &img2)
jpgOptions := jpeg.Options{IMG_QUALITY}
imgResized, err := resizeImg(img1, IMG_WIDTH_BIG)
if err != nil {
log.Error("Error resizing big image: ", err.Error())
return false
}
err = jpeg.Encode(fBig, imgResized, &jpgOptions)
if err != nil {
log.Error("Error encoding big image: ", err.Error())
return false
}
imgSmallResized, err := resizeImg(&img2, IMG_WIDTH_SMALL)
if err != nil {
log.Error("Error resizing small image: ", err.Error())
return false
}
err = jpeg.Encode(fSmall, imgSmallResized, &jpgOptions)
if err != nil {
log.Error("Error encoding small image: ", err.Error())
return false
}
return true
}
func resizeImg(imgReader io.Reader, width uint) (image.Image, error) {
img, _, err := image.Decode(imgReader)
if err != nil {
return nil, err
}
return resize.Resize(width, 0, img, resize.NearestNeighbor), nil
}