Simple blogging system written in Go https://goblog.app
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GoBlog/micropubMedia.go

80 lines
2.1 KiB

package main
import (
"crypto/sha256"
"fmt"
"io"
"mime"
"net/http"
"path/filepath"
"strings"
"go.goblog.app/app/pkgs/bufferpool"
"go.goblog.app/app/pkgs/contenttype"
)
const micropubMediaSubPath = "/media"
func (a *goBlog) serveMicropubMedia(w http.ResponseWriter, r *http.Request) {
// Check scope
if !a.micropubCheckScope(w, r, "media") {
return
}
// Check if request is multipart
if ct := r.Header.Get(contentType); !strings.Contains(ct, contenttype.MultipartForm) {
a.serveError(w, r, "wrong content-type", http.StatusBadRequest)
return
}
// Parse multipart form
err := r.ParseMultipartForm(0)
if err != nil {
a.serveError(w, r, err.Error(), http.StatusBadRequest)
return
}
// Get file
file, header, err := r.FormFile("file")
if err != nil {
a.serveError(w, r, err.Error(), http.StatusBadRequest)
return
}
// Read the file into temporary buffer and generate sha256 hash
hash := sha256.New()
buffer := bufferpool.Get()
defer bufferpool.Put(buffer)
_, _ = io.Copy(buffer, io.TeeReader(file, hash))
_ = file.Close()
_ = r.Body.Close()
// Get file extension
fileExtension := filepath.Ext(header.Filename)
if fileExtension == "" {
// Find correct file extension if original filename does not contain one
mimeType := header.Header.Get(contentType)
if len(mimeType) > 0 {
allExtensions, _ := mime.ExtensionsByType(mimeType)
if len(allExtensions) > 0 {
fileExtension = allExtensions[0]
}
}
}
// Generate the file name
fileName := fmt.Sprintf("%x%s", hash.Sum(nil), fileExtension)
// Save file
location, err := a.saveMediaFile(fileName, buffer)
if err != nil {
a.serveError(w, r, "failed to save original file: "+err.Error(), http.StatusInternalServerError)
return
}
// Try to compress file (only when not in private mode)
if !a.isPrivate() {
compressedLocation, compressionErr := a.compressMediaFile(location)
if compressionErr != nil {
a.serveError(w, r, "failed to compress file: "+compressionErr.Error(), http.StatusInternalServerError)
return
}
// Overwrite location
if compressedLocation != "" {
location = compressedLocation
}
}
http.Redirect(w, r, location, http.StatusCreated)
}