mirror of https://github.com/stashapp/stash.git
72 lines
1.9 KiB
Go
72 lines
1.9 KiB
Go
package utils
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import (
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"crypto/md5"
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"encoding/base64"
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"fmt"
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"net/http"
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"regexp"
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"strings"
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)
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// ProcessBase64Image transforms a base64 encoded string from a form post and returns the MD5 hash of the data and the
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// image itself as a byte slice.
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func ProcessBase64Image(imageString string) (string, []byte, error) {
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if imageString == "" {
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return "", nil, fmt.Errorf("empty image string")
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}
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regex := regexp.MustCompile(`^data:.+\/(.+);base64,(.*)$`)
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matches := regex.FindStringSubmatch(imageString)
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var encodedString string
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if len(matches) > 2 {
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encodedString = regex.FindStringSubmatch(imageString)[2]
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} else {
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encodedString = imageString
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}
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imageData, err := GetDataFromBase64String(encodedString)
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if err != nil {
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return "", nil, err
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}
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return MD5FromBytes(imageData), imageData, nil
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}
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// GetDataFromBase64String returns the given base64 encoded string as a byte slice
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func GetDataFromBase64String(encodedString string) ([]byte, error) {
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return base64.StdEncoding.DecodeString(encodedString)
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}
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// GetBase64StringFromData returns the given byte slice as a base64 encoded string
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func GetBase64StringFromData(data []byte) string {
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return base64.StdEncoding.EncodeToString(data)
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// Really slow
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//result = regexp.MustCompile(`(.{60})`).ReplaceAllString(result, "$1\n")
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//if result[len(result)-1:] != "\n" {
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// result += "\n"
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//}
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//return result
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}
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func ServeImage(image []byte, w http.ResponseWriter, r *http.Request) error {
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etag := fmt.Sprintf("%x", md5.Sum(image))
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if match := r.Header.Get("If-None-Match"); match != "" {
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if strings.Contains(match, etag) {
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w.WriteHeader(http.StatusNotModified)
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return nil
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}
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}
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contentType := http.DetectContentType(image)
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if contentType == "text/xml; charset=utf-8" || contentType == "text/plain; charset=utf-8" {
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contentType = "image/svg+xml"
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}
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w.Header().Set("Content-Type", contentType)
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w.Header().Add("Etag", etag)
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_, err := w.Write(image)
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return err
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}
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