1 files changed, 115 insertions, 0 deletions
diff --git a/modules/lfs/shared.go b/modules/lfs/shared.go
new file mode 100644
index 0000000..a4326b5
--- /dev/null
+++ b/modules/lfs/shared.go
@@ -0,0 +1,115 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package lfs
+
+import (
+	"errors"
+	"fmt"
+	"time"
+
+	"code.gitea.io/gitea/modules/util"
+)
+
+const (
+	// MediaType contains the media type for LFS server requests
+	MediaType = "application/vnd.git-lfs+json"
+	// Some LFS servers offer content with other types, so fallback to '*/*' if application/vnd.git-lfs+json cannot be served
+	AcceptHeader = "application/vnd.git-lfs+json;q=0.9, */*;q=0.8"
+)
+
+// BatchRequest contains multiple requests processed in one batch operation.
+// https://github.com/git-lfs/git-lfs/blob/main/docs/api/batch.md#requests
+type BatchRequest struct {
+	Operation string     `json:"operation"`
+	Transfers []string   `json:"transfers,omitempty"`
+	Ref       *Reference `json:"ref,omitempty"`
+	Objects   []Pointer  `json:"objects"`
+}
+
+// Reference contains a git reference.
+// https://github.com/git-lfs/git-lfs/blob/main/docs/api/batch.md#ref-property
+type Reference struct {
+	Name string `json:"name"`
+}
+
+// Pointer contains LFS pointer data
+type Pointer struct {
+	Oid  string `json:"oid" xorm:"UNIQUE(s) INDEX NOT NULL"`
+	Size int64  `json:"size" xorm:"NOT NULL"`
+}
+
+// BatchResponse contains multiple object metadata Representation structures
+// for use with the batch API.
+// https://github.com/git-lfs/git-lfs/blob/main/docs/api/batch.md#successful-responses
+type BatchResponse struct {
+	Transfer string            `json:"transfer,omitempty"`
+	Objects  []*ObjectResponse `json:"objects"`
+}
+
+// ObjectResponse is object metadata as seen by clients of the LFS server.
+type ObjectResponse struct {
+	Pointer
+	Actions map[string]*Link `json:"actions,omitempty"`
+	Links   map[string]*Link `json:"_links,omitempty"`
+	Error   *ObjectError     `json:"error,omitempty"`
+}
+
+// Link provides a structure with information about how to access a object.
+type Link struct {
+	Href      string            `json:"href"`
+	Header    map[string]string `json:"header,omitempty"`
+	ExpiresAt *time.Time        `json:"expires_at,omitempty"`
+}
+
+// ObjectError defines the JSON structure returned to the client in case of an error.
+type ObjectError struct {
+	Code    int    `json:"code"`
+	Message string `json:"message"`
+}
+
+var (
+	// See https://github.com/git-lfs/git-lfs/blob/main/docs/api/batch.md#successful-responses
+	// LFS object error codes should match HTTP status codes where possible:
+	//   404 - The object does not exist on the server.
+	//   409 - The specified hash algorithm disagrees with the server's acceptable options.
+	//   410 - The object was removed by the owner.
+	//   422 - Validation error.
+
+	ErrObjectNotExist     = util.ErrNotExist // the object does not exist on the server
+	ErrObjectHashMismatch = errors.New("the specified hash algorithm disagrees with the server's acceptable options")
+	ErrObjectRemoved      = errors.New("the object was removed by the owner")
+	ErrObjectValidation   = errors.New("validation error")
+)
+
+func (e *ObjectError) Error() string {
+	return fmt.Sprintf("[%d] %s", e.Code, e.Message)
+}
+
+func (e *ObjectError) Unwrap() error {
+	switch e.Code {
+	case 404:
+		return ErrObjectNotExist
+	case 409:
+		return ErrObjectHashMismatch
+	case 410:
+		return ErrObjectRemoved
+	case 422:
+		return ErrObjectValidation
+	default:
+		return errors.New(e.Message)
+	}
+}
+
+// PointerBlob associates a Git blob with a Pointer.
+type PointerBlob struct {
+	Hash string
+	Pointer
+}
+
+// ErrorResponse describes the error to the client.
+type ErrorResponse struct {
+	Message          string
+	DocumentationURL string `json:"documentation_url,omitempty"`
+	RequestID        string `json:"request_id,omitempty"`
+}