Initial commit of http 2.0 plugin

1 files changed, 160 insertions, 0 deletions

diff --git a/plugins/http/uploads.go b/plugins/http/uploads.go
new file mode 100644
index 00000000..39a9eaf2
--- /dev/null
+++ b/plugins/http/uploads.go
@@ -0,0 +1,160 @@
+package http
+
+import (
+	"fmt"
+	json "github.com/json-iterator/go"
+	"github.com/sirupsen/logrus"
+	"io"
+	"io/ioutil"
+	"mime/multipart"
+	"os"
+	"sync"
+)
+
+const (
+	// UploadErrorOK - no error, the file uploaded with success.
+	UploadErrorOK = 0
+
+	// UploadErrorNoFile - no file was uploaded.
+	UploadErrorNoFile = 4
+
+	// UploadErrorNoTmpDir - missing a temporary folder.
+	UploadErrorNoTmpDir = 5
+
+	// UploadErrorCantWrite - failed to write file to disk.
+	UploadErrorCantWrite = 6
+
+	// UploadErrorExtension - forbidden file extension.
+	UploadErrorExtension = 7
+)
+
+// Uploads tree manages uploaded files tree and temporary files.
+type Uploads struct {
+	// associated temp directory and forbidden extensions.
+	cfg *UploadsConfig
+
+	// 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) {
+	j := json.ConfigCompatibleWithStandardLibrary
+	return j.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.
+func (u *Uploads) Open(log *logrus.Logger) {
+	var wg sync.WaitGroup
+	for _, f := range u.list {
+		wg.Add(1)
+		go func(f *FileUpload) {
+			defer wg.Done()
+			err := f.Open(u.cfg)
+			if err != nil && log != nil {
+				log.Error(fmt.Errorf("error opening the file: error %v", err))
+			}
+		}(f)
+	}
+
+	wg.Wait()
+}
+
+// Clear deletes all temporary files.
+func (u *Uploads) Clear(log *logrus.Logger) {
+	for _, f := range u.list {
+		if f.TempFilename != "" && exists(f.TempFilename) {
+			err := os.Remove(f.TempFilename)
+			if err != nil && log != nil {
+				log.Error(fmt.Errorf("error removing the file: error %v", err))
+			}
+		}
+	}
+}
+
+// FileUpload represents singular file NewUpload.
+type FileUpload struct {
+	// ID contains filename specified by the client.
+	Name string `json:"name"`
+
+	// Mime contains mime-type provided by the client.
+	Mime string `json:"mime"`
+
+	// 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
+}
+
+// NewUpload wraps net/http upload into PRS-7 compatible structure.
+func NewUpload(f *multipart.FileHeader) *FileUpload {
+	return &FileUpload{
+		Name:   f.Filename,
+		Mime:   f.Header.Get("Content-Type"),
+		Error:  UploadErrorOK,
+		header: f,
+	}
+}
+
+// Open moves file content into temporary file available for PHP.
+// NOTE:
+// There is 2 deferred functions, and in case of getting 2 errors from both functions
+// error from close of temp file would be overwritten by error from the main file
+// STACK
+// DEFER FILE CLOSE (2)
+// DEFER TMP CLOSE  (1)
+func (f *FileUpload) Open(cfg *UploadsConfig) (err error) {
+	if cfg.Forbids(f.Name) {
+		f.Error = UploadErrorExtension
+		return nil
+	}
+
+	file, err := f.header.Open()
+	if err != nil {
+		f.Error = UploadErrorNoFile
+		return err
+	}
+
+	defer func() {
+		// close the main file
+		err = 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 func() {
+		// close the temp file
+		err = tmp.Close()
+	}()
+
+	if f.Size, err = io.Copy(tmp, file); err != nil {
+		f.Error = UploadErrorCantWrite
+	}
+
+	return err
+}
+
+// exists if file exists.
+func exists(path string) bool {
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		return false
+	}
+	return true
+}