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package main
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"github.com/nfnt/resize"
"image"
_ "image/gif"
"image/jpeg"
_ "image/png"
"io"
"log"
"mime"
"net/http"
"os"
"path"
"strconv"
"strings"
)
type redditList struct {
Data struct {
Children []struct {
Data *EarthPorn `json:"data"`
} `json:"children"`
} `json:"data"`
}
type EarthPorn struct {
Title string `json:"title"`
URL string `json:"url,omitempty"`
Permalink string `json:"permalink"`
Domain string `json:"domain"`
Saved bool
data, origdata []byte
mediatype string
}
const earthPornURL = "http://www.reddit.com/r/EarthPorn.json"
func GetEarthPorn() (EarthPorn, error) {
resp, err := http.Get(earthPornURL)
if err != nil {
return EarthPorn{}, err
}
defer resp.Body.Close()
var list redditList
dec := json.NewDecoder(resp.Body)
if err := dec.Decode(&list); err != nil {
return EarthPorn{}, err
}
for _, el := range list.Data.Children {
p := el.Data
if p.Domain == "self.EarthPorn" {
continue
}
if p.URL == "" {
continue
}
if p.fetch() {
return *p, nil
}
}
return EarthPorn{}, errors.New("Could not get EarthPorn: No image could be extracted")
}
func (p *EarthPorn) fetch() bool {
// TODO: We can do further processing here (e.g. if we get a link to flickr, extract the image).
// For now, we will simply test, if the URL points to an image.
resp, err := http.Get(p.URL)
if err != nil {
return false
}
defer resp.Body.Close()
t := resp.Header.Get("Content-Type")
if t == "" {
log.Printf("could not get image of %s: no Content-Type", p.Permalink)
return false
}
mt, _, err := mime.ParseMediaType(t)
if err != nil {
log.Printf("could not get image of %s: %s", p.Permalink, err)
return false
}
if strings.Split(mt, "/")[0] != "image" {
log.Printf("could not get image of %s: not an image", p.Permalink)
return false
}
buf := new(bytes.Buffer)
if _, err := io.Copy(buf, resp.Body); err != nil {
log.Printf("could not get image of %s: %s", p.Permalink, err)
return false
}
p.mediatype = t
p.origdata = buf.Bytes()
p.data = p.origdata
p.resize()
return true
}
var maxdim = 2500
func setMaxdimCmd(params []string) error {
if len(params) != 1 {
return errors.New("set-maxdim needs one parameter, which must be a positive number")
}
newmaxdim, err := strconv.ParseUint(params[0], 10, 32)
if err != nil {
return fmt.Errorf("1st parameter of set-maxdim could not be parsed as a number: %s", err)
}
maxdim = int(newmaxdim)
return nil
}
// resize resizes image, if it's very large
func (p *EarthPorn) resize() {
im, _, err := image.Decode(bytes.NewReader(p.origdata))
if err != nil {
log.Printf("Failed decoding in resize(): %s", err)
return
}
size := im.Bounds().Size()
if !(size.X > maxdim || size.Y > maxdim) {
return
}
var w, h int
if size.X > size.Y {
h = maxdim * (size.Y / size.X)
w = maxdim
} else {
w = maxdim * (size.X / size.Y)
h = maxdim
}
im = resize.Resize(uint(w), uint(h), im, resize.Bicubic)
buf := new(bytes.Buffer)
if err := jpeg.Encode(buf, im, &jpeg.Options{Quality: 90}); err != nil {
log.Printf("Failed encoding in resize(): %s", err)
return
}
p.data = buf.Bytes()
p.mediatype = "image/jpeg"
}
var extensions = map[string]string{
"image/png": "png",
"image/jpeg": "jpg",
"image/gif": "gif",
"image/x-ms-bmp": "bmp",
"image/x-bmp": "bmp",
"image/bmp": "bmp",
"image/tiff": "tiff",
"image/tiff-fx": "tiff",
"image/x-targa": "tga",
"image/x-tga": "tga",
"image/webp": "webp",
}
var savepath = ""
func setSavepathCmd(params []string) error {
if len(params) != 1 {
return errors.New("set-earthporn-savepath needs one parameter")
}
savepath = params[0]
return nil
}
const maxTitleLenInFilename = 100
func (p *EarthPorn) save() error {
ext := extensions[p.mediatype]
pp := strings.Split(p.Permalink, "/")
threadid := pp[len(pp)-3]
title := strings.Replace(p.Title, "/", "-", -1)
tRunes := []rune(title)
if len(tRunes) > maxTitleLenInFilename {
title = string(tRunes[0:maxTitleLenInFilename])
}
f, err := os.Create(path.Join(savepath, threadid+" - "+title+"."+ext))
if err != nil {
return fmt.Errorf("Could not save earthporn: %s", err)
}
defer f.Close()
if _, err := f.Write(p.origdata); err != nil {
return fmt.Errorf("Could not save earthporn: %s", err)
}
p.Saved = true
return nil
}
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