add helper function for handling existing file in s3

packages/http/file.go

@@ -2,14 +2,17 @@ package http
 
 import (
 	"crypto/sha256"
+	"go-socket/packages/convertions"
 	"go-socket/packages/globals"
 	"go-socket/packages/minio"
 	"io"
 	"net/http"
-
-	"go-socket/packages/convertions"
 )
 
+func handleExistingUpload() {
+	
+}
+
 func HandleFileUpload(response http.ResponseWriter, request *http.Request) {
 	if !postValidCheckWithResponseOnFail(&response, request, true) {
 		return
@@ -36,14 +39,18 @@ func HandleFileUpload(response http.ResponseWriter, request *http.Request) {
 	request.Body = http.MaxBytesReader(response, request.Body, int64(globals.MaxPostWithFileBytes))
 	multipartReader, err := request.MultipartReader()
 	if err != nil {
-		http.Error(response, "expected multipart form", 400)
+		http.Error(response, "expected multipart form", http.StatusBadRequest)
 		return
 	}
 
+	uploaded := false
 	for {
 		part, err := multipartReader.NextPart()
 		if err == io.EOF {
-			http.Error(response, "bad request", 400)
+			break
+		}
+		if err != nil {
+			http.Error(response, "bad request", http.StatusBadRequest)
 			return
 		}
 
@@ -52,22 +59,35 @@ func HandleFileUpload(response http.ResponseWriter, request *http.Request) {
 			continue
 		}
 
-		if len(part.FileName()) != sha256.Size {
+		if len(part.FileName()) != sha256.Size*2 {
 			part.Close()
-			http.Error(response, "filename must be sha256 of whole file", 400)
+			http.Error(response, "filename must be hex-encoded sha256 of whole file", http.StatusBadRequest)
 			return
 		}
 
-		err = minio.Upload(ctx, part.FileName(), part, -1, part.Header.Get("Content-Type"), user.Id)
+		contentType := part.Header.Get("Content-Type")
+		key := minio.GetKey(part.FileName(), contentType)
+
+		if minio.DoesExist(ctx, key) {
+			part.Close()
+			uploaded = true
+			continue
+		}
+
+		err = minio.Upload(ctx, key, part, -1, contentType, user.Id)
+		part.Close()
 		if err != nil {
 			http.Error(response, "upload failed", http.StatusInternalServerError)
 			return
 		}
-		part.Close()
 
-		if err != nil {
+		uploaded = true
-			http.Error(response, "upload failed", 500)
+	}
+
+	if !uploaded {
+		http.Error(response, "no file in request", http.StatusBadRequest)
 		return
 	}
-	}
+
+	response.WriteHeader(http.StatusAccepted)
 }

packages/minio/minio.go

@@ -35,7 +35,7 @@ func extensionFromContentType(ct string) string {
 	return exts[0]
 }
 
-func getKey(hash string, contentType string) string {
+func GetKey(hash string, contentType string) string {
 	return hash + extensionFromContentType(contentType)
 }
 
@@ -78,15 +78,12 @@ func Upload(ctx context.Context, key string, body io.Reader, size int64, content
 	return err
 }
 
-func getDownloadUrl(ctx context.Context, key string) (*url.URL, error) {
+func GetDownloadUrl(ctx context.Context, key string) (*url.URL, error) {
 	u, err := minClient.PresignedGetObject(ctx, globals.FileStorageBucketName, key, globals.FileDownloadLinkTtl, nil)
 	return u, err
 }
 
 func DoesExist(ctx context.Context, key string) bool {
-	_, err := minClient.GetObject(ctx, globals.FileStorageBucketName, key, minio.GetObjectOptions{})
+	_, err := minClient.StatObject(ctx, globals.FileStorageBucketName, key, minio.StatObjectOptions{})
-	if err != nil {
+	return err == nil
-		return false
-	}
-	return true
 }