mirror of https://github.com/stashapp/stash.git
128 lines
3.2 KiB
Go
128 lines
3.2 KiB
Go
package utils
|
|
|
|
import (
|
|
"crypto/md5"
|
|
"encoding/base64"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"net/http"
|
|
"regexp"
|
|
"strings"
|
|
"time"
|
|
)
|
|
|
|
// Timeout to get the image. Includes transfer time. May want to make this
|
|
// configurable at some point.
|
|
const imageGetTimeout = time.Second * 60
|
|
|
|
const base64RE = `^data:.+\/(.+);base64,(.*)$`
|
|
|
|
// ProcessImageInput transforms an image string either from a base64 encoded
|
|
// string, or from a URL, and returns the image as a byte slice
|
|
func ProcessImageInput(imageInput string) ([]byte, error) {
|
|
regex := regexp.MustCompile(base64RE)
|
|
if regex.MatchString(imageInput) {
|
|
_, d, err := ProcessBase64Image(imageInput)
|
|
return d, err
|
|
}
|
|
|
|
// assume input is a URL. Read it.
|
|
return ReadImageFromURL(imageInput)
|
|
}
|
|
|
|
// ReadImageFromURL returns image data from a URL
|
|
func ReadImageFromURL(url string) ([]byte, error) {
|
|
client := &http.Client{
|
|
Timeout: imageGetTimeout,
|
|
}
|
|
|
|
req, err := http.NewRequest("GET", url, nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// assume is a URL for now
|
|
|
|
// set the host of the URL as the referer
|
|
if req.URL.Scheme != "" {
|
|
req.Header.Set("Referer", req.URL.Scheme+"://"+req.Host+"/")
|
|
}
|
|
|
|
resp, err := client.Do(req)
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
defer resp.Body.Close()
|
|
|
|
body, err := ioutil.ReadAll(resp.Body)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return body, nil
|
|
}
|
|
|
|
// ProcessBase64Image transforms a base64 encoded string from a form post and returns the MD5 hash of the data and the
|
|
// image itself as a byte slice.
|
|
func ProcessBase64Image(imageString string) (string, []byte, error) {
|
|
if imageString == "" {
|
|
return "", nil, fmt.Errorf("empty image string")
|
|
}
|
|
|
|
regex := regexp.MustCompile(base64RE)
|
|
matches := regex.FindStringSubmatch(imageString)
|
|
var encodedString string
|
|
if len(matches) > 2 {
|
|
encodedString = regex.FindStringSubmatch(imageString)[2]
|
|
} else {
|
|
encodedString = imageString
|
|
}
|
|
imageData, err := GetDataFromBase64String(encodedString)
|
|
if err != nil {
|
|
return "", nil, err
|
|
}
|
|
|
|
return MD5FromBytes(imageData), imageData, nil
|
|
}
|
|
|
|
// GetDataFromBase64String returns the given base64 encoded string as a byte slice
|
|
func GetDataFromBase64String(encodedString string) ([]byte, error) {
|
|
return base64.StdEncoding.DecodeString(encodedString)
|
|
}
|
|
|
|
// GetBase64StringFromData returns the given byte slice as a base64 encoded string
|
|
func GetBase64StringFromData(data []byte) string {
|
|
return base64.StdEncoding.EncodeToString(data)
|
|
|
|
// Really slow
|
|
//result = regexp.MustCompile(`(.{60})`).ReplaceAllString(result, "$1\n")
|
|
//if result[len(result)-1:] != "\n" {
|
|
// result += "\n"
|
|
//}
|
|
//return result
|
|
}
|
|
|
|
func ServeImage(image []byte, w http.ResponseWriter, r *http.Request) error {
|
|
etag := fmt.Sprintf("%x", md5.Sum(image))
|
|
|
|
if match := r.Header.Get("If-None-Match"); match != "" {
|
|
if strings.Contains(match, etag) {
|
|
w.WriteHeader(http.StatusNotModified)
|
|
return nil
|
|
}
|
|
}
|
|
|
|
contentType := http.DetectContentType(image)
|
|
if contentType == "text/xml; charset=utf-8" || contentType == "text/plain; charset=utf-8" {
|
|
contentType = "image/svg+xml"
|
|
}
|
|
|
|
w.Header().Set("Content-Type", contentType)
|
|
w.Header().Add("Etag", etag)
|
|
w.Header().Set("Cache-Control", "public, max-age=604800, immutable")
|
|
_, err := w.Write(image)
|
|
return err
|
|
}
|