mirror of https://github.com/jlelse/GoBlog
167 lines
4.5 KiB
Go
167 lines
4.5 KiB
Go
package main
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import (
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"crypto/sha256"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"mime"
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"mime/multipart"
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"net/http"
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"net/url"
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"os"
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"path/filepath"
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"sort"
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"strings"
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tfgo "codeberg.org/jlelse/tinify"
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)
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const micropubMediaSubPath = "/media"
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func serveMicropubMedia(w http.ResponseWriter, r *http.Request) {
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if !strings.Contains(r.Context().Value(indieAuthScope).(string), "media") {
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serveError(w, r, "media scope missing", http.StatusForbidden)
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return
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}
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if appConfig.Micropub.MediaStorage == nil {
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serveError(w, r, "Not configured", http.StatusNotImplemented)
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return
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}
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if ct := r.Header.Get(contentType); !strings.Contains(ct, contentTypeMultipartForm) {
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serveError(w, r, "wrong content-type", http.StatusBadRequest)
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return
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}
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err := r.ParseMultipartForm(0)
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if err != nil {
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serveError(w, r, err.Error(), http.StatusBadRequest)
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return
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}
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file, header, err := r.FormFile("file")
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if err != nil {
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serveError(w, r, err.Error(), http.StatusBadRequest)
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return
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}
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defer func() { _ = file.Close() }()
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hashFile, _, _ := r.FormFile("file")
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defer func() { _ = hashFile.Close() }()
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fileName, err := getSHA256(hashFile)
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if err != nil {
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serveError(w, r, err.Error(), http.StatusInternalServerError)
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return
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}
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fileExtension := filepath.Ext(header.Filename)
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if len(fileExtension) == 0 {
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// Find correct file extension if original filename does not contain one
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mimeType := header.Header.Get(contentType)
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if len(mimeType) > 0 {
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allExtensions, _ := mime.ExtensionsByType(mimeType)
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if len(allExtensions) > 0 {
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fileExtension = allExtensions[0]
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}
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}
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}
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fileName += strings.ToLower(fileExtension)
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// Save file
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location, err := uploadFile(fileName, file)
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if err != nil {
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serveError(w, r, "failed to save original file: "+err.Error(), http.StatusInternalServerError)
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return
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}
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// Try to compress file
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if ms := appConfig.Micropub.MediaStorage; ms != nil && ms.TinifyKey != "" {
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compressedLocation, err := tinify(location, ms)
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if err != nil {
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serveError(w, r, "failed to compress file: "+err.Error(), http.StatusInternalServerError)
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return
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} else if compressedLocation != "" {
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location = compressedLocation
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} else {
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serveError(w, r, "No compressed location", http.StatusInternalServerError)
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}
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}
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http.Redirect(w, r, location, http.StatusCreated)
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}
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func uploadFile(filename string, f io.Reader) (string, error) {
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ms := appConfig.Micropub.MediaStorage
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if ms != nil && ms.BunnyStorageKey != "" && ms.BunnyStorageName != "" {
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return uploadToBunny(filename, f, ms)
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}
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loc, err := saveMediaFile(filename, f)
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if err != nil {
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return "", err
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}
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if ms != nil && ms.MediaURL != "" {
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return ms.MediaURL + loc, nil
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}
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return loc, nil
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}
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func uploadToBunny(filename string, f io.Reader, config *configMicropubMedia) (location string, err error) {
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req, _ := http.NewRequest(http.MethodPut, fmt.Sprintf("https://storage.bunnycdn.com/%s/%s", url.PathEscape(config.BunnyStorageName), url.PathEscape(filename)), f)
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req.Header.Add("AccessKey", config.BunnyStorageKey)
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resp, err := http.DefaultClient.Do(req)
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if err != nil || resp.StatusCode != http.StatusCreated {
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return "", errors.New("failed to upload file to BunnyCDN")
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}
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return config.MediaURL + "/" + filename, nil
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}
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func tinify(url string, config *configMicropubMedia) (location string, err error) {
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fileExtension := func() string {
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spliced := strings.Split(url, ".")
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return spliced[len(spliced)-1]
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}()
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supportedTypes := []string{"jpg", "jpeg", "png"}
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sort.Strings(supportedTypes)
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i := sort.SearchStrings(supportedTypes, strings.ToLower(fileExtension))
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if !(i < len(supportedTypes) && supportedTypes[i] == strings.ToLower(fileExtension)) {
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return "", nil
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}
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tfgo.SetKey(config.TinifyKey)
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s, err := tfgo.FromUrl(url)
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if err != nil {
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return "", err
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}
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err = s.Resize(&tfgo.ResizeOption{
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Method: tfgo.ResizeMethodScale,
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Width: 2000,
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})
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if err != nil {
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return "", err
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}
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file, err := ioutil.TempFile("", "tiny-*."+fileExtension)
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if err != nil {
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return "", err
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}
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defer func() {
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_ = file.Close()
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_ = os.Remove(file.Name())
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}()
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err = s.ToFile(file.Name())
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if err != nil {
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return "", err
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}
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hashFile, err := os.Open(file.Name())
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defer func() { _ = hashFile.Close() }()
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if err != nil {
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return "", err
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}
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fileName, err := getSHA256(hashFile)
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if err != nil {
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return "", err
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}
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location, err = uploadFile(fileName+"."+fileExtension, file)
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return
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}
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func getSHA256(file multipart.File) (filename string, err error) {
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h := sha256.New()
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if _, err = io.Copy(h, file); err != nil {
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return "", err
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}
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return fmt.Sprintf("%x", h.Sum(nil)), nil
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}
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