better server re-configuration

1 files changed, 206 insertions, 0 deletions

diff --git a/cmd/_____/http/uploads.go b/cmd/_____/http/uploads.go
new file mode 100644
index 00000000..c3b18169
--- /dev/null
+++ b/cmd/_____/http/uploads.go
@@ -0,0 +1,206 @@
+package http
+
+import (
+	"encoding/json"
+	"io"
+	"io/ioutil"
+	"mime/multipart"
+	"net/http"
+	"os"
+	"strings"
+	"sync"
+)
+
+const (
+	// There is no error, the file uploaded with success.
+	UploadErrorOK = 0
+
+	// No file was uploaded.
+	UploadErrorNoFile = 4
+
+	// Missing a temporary folder.
+	UploadErrorNoTmpDir = 5
+
+	// Failed to write file to disk.
+	UploadErrorCantWrite = 6
+
+	// ForbidUploads file extension.
+	UploadErrorExtension = 7
+)
+
+// FileUpload represents singular file wrapUpload.
+type FileUpload struct {
+	// Name contains filename specified by the client.
+	Name string `json:"name"`
+
+	// MimeType contains mime-type provided by the client.
+	MimeType string `json:"type"`
+
+	// Size of the uploaded file.
+	Size int64 `json:"size"`
+
+	// Error indicates file upload error (if any). See http://php.net/manual/en/features.file-upload.errors.php
+	Error int `json:"error"`
+
+	// TempFilename points to temporary file location.
+	TempFilename string `json:"tmpName"`
+
+	// associated file header
+	header *multipart.FileHeader
+}
+
+func (f *FileUpload) Open(cfg *Config) error {
+	if cfg.Forbidden(f.Name) {
+		f.Error = UploadErrorExtension
+		return nil
+	}
+
+	file, err := f.header.Open()
+	if err != nil {
+		f.Error = UploadErrorNoFile
+		return err
+	}
+	defer file.Close()
+
+	tmp, err := ioutil.TempFile(cfg.TmpDir, "upload")
+	if err != nil {
+		// most likely cause of this issue is missing tmp dir
+		f.Error = UploadErrorNoTmpDir
+		return err
+	}
+
+	f.TempFilename = tmp.Name()
+	defer tmp.Close()
+
+	if f.Size, err = io.Copy(tmp, file); err != nil {
+		f.Error = UploadErrorCantWrite
+	}
+
+	return err
+}
+
+type fileTree map[string]interface{}
+
+func (d fileTree) push(k string, v []*FileUpload) {
+	if len(v) == 0 {
+		// skip empty values
+		return
+	}
+
+	indexes := make([]string, 0)
+	for _, index := range strings.Split(k, "[") {
+		indexes = append(indexes, strings.Trim(index, "]"))
+	}
+
+	if len(indexes) <= maxLevel {
+		d.mount(indexes, v)
+	}
+}
+
+// mount mounts data tree recursively.
+func (d fileTree) mount(i []string, v []*FileUpload) {
+	if len(v) == 0 {
+		return
+	}
+
+	if len(i) == 1 {
+		// single value context
+		d[i[0]] = v[0]
+		return
+	}
+
+	if len(i) == 2 && i[1] == "" {
+		// non associated array of elements
+		d[i[0]] = v
+		return
+	}
+
+	if p, ok := d[i[0]]; ok {
+		p.(fileTree).mount(i[1:], v)
+	}
+
+	d[i[0]] = make(fileTree)
+	d[i[0]].(fileTree).mount(i[1:], v)
+}
+
+// tree manages uploaded files tree and temporary files.
+type Uploads struct {
+	// pre processed data tree for Uploads.
+	tree fileTree
+
+	// flat list of all file Uploads.
+	list []*FileUpload
+}
+
+// MarshalJSON marshal tree tree into JSON.
+func (u *Uploads) MarshalJSON() ([]byte, error) {
+	return json.Marshal(u.tree)
+}
+
+// Open moves all uploaded files to temp directory, return error in case of issue with temp directory. File errors
+// will be handled individually. @todo: do we need it?
+func (u *Uploads) Open(cfg *Config) error {
+	var wg sync.WaitGroup
+	for _, f := range u.list {
+		wg.Add(1)
+		go func(f *FileUpload) {
+			defer wg.Done()
+			f.Open(cfg)
+		}(f)
+	}
+
+	wg.Wait()
+	return nil
+}
+
+// Clear deletes all temporary files.
+func (u *Uploads) Clear() {
+	for _, f := range u.list {
+		if f.TempFilename != "" && exists(f.TempFilename) {
+			os.Remove(f.TempFilename)
+		}
+	}
+}
+
+// parse incoming dataTree request into JSON (including multipart form dataTree)
+func parseUploads(r *http.Request) (*Uploads, error) {
+	u := &Uploads{
+		tree: make(fileTree),
+		list: make([]*FileUpload, 0),
+	}
+
+	for k, v := range r.MultipartForm.File {
+		files := make([]*FileUpload, 0, len(v))
+		for _, f := range v {
+			files = append(files, wrapUpload(f))
+		}
+
+		u.list = append(u.list, files...)
+		u.tree.push(k, files)
+	}
+
+	return u, nil
+}
+
+func wrapUpload(f *multipart.FileHeader) *FileUpload {
+	return &FileUpload{
+		Name:     f.Filename,
+		MimeType: f.Header.Get("Content-Type"),
+		Error:    UploadErrorOK,
+		header:   f,
+	}
+}
+
+// exists if file exists.
+func exists(path string) bool {
+	_, err := os.Stat(path)
+	if err == nil {
+		return true
+	}
+
+	if os.IsNotExist(err) {
+		return false
+	}
+
+	return false
+}