Attachments: Add extension support, allow all types for releases (#12465)

* Attachments: Add extension support, allow all types for releases

- Add support for file extensions, matching the `accept` attribute of `<input type="file">`
- Add support for type wildcard mime types, e.g. `image/*`
- Create repository.release.ALLOWED_TYPES setting (default unrestricted)
- Change default for attachment.ALLOWED_TYPES to a list of extensions
- Split out POST /attachments into two endpoints for issue/pr and
  releases to prevent circumvention of allowed types check

Fixes: https://github.com/go-gitea/gitea/pull/10172
Fixes: https://github.com/go-gitea/gitea/issues/7266
Fixes: https://github.com/go-gitea/gitea/pull/12460
Ref: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/file#Unique_file_type_specifiers

* rename function

* extract GET routes out of RepoMustNotBeArchived

Co-authored-by: Lauris BH <lauris@nix.lv>

modules/setting/attachment.go

@@ -6,7 +6,6 @@ package setting
 
 import (
 	"path/filepath"
-	"strings"
 
 	"code.gitea.io/gitea/modules/log"
 )
@@ -65,7 +64,7 @@ func newAttachmentService() {
 		Attachment.Minio.BasePath = sec.Key("MINIO_BASE_PATH").MustString("attachments/")
 	}
 
-	Attachment.AllowedTypes = strings.Replace(sec.Key("ALLOWED_TYPES").MustString("image/jpeg,image/png,application/zip,application/gzip"), "|", ",", -1)
+	Attachment.AllowedTypes = sec.Key("ALLOWED_TYPES").MustString(".docx,.gif,.gz,.jpeg,.jpg,.log,.pdf,.png,.pptx,.txt,.xlsx,.zip")
 	Attachment.MaxSize = sec.Key("MAX_SIZE").MustInt64(4)
 	Attachment.MaxFiles = sec.Key("MAX_FILES").MustInt(5)
 	Attachment.Enabled = sec.Key("ENABLED").MustBool(true)

modules/setting/repository.go

@@ -58,7 +58,7 @@ var (
 		Upload struct {
 			Enabled      bool
 			TempPath     string
-			AllowedTypes []string `delim:"|"`
+			AllowedTypes string
 			FileMaxSize  int64
 			MaxFiles     int
 		} `ini:"-"`
@@ -85,6 +85,10 @@ var (
 			LockReasons []string
 		} `ini:"repository.issue"`
 
+		Release struct {
+			AllowedTypes string
+		} `ini:"repository.release"`
+
 		Signing struct {
 			SigningKey        string
 			SigningName       string
@@ -165,13 +169,13 @@ var (
 		Upload: struct {
 			Enabled      bool
 			TempPath     string
-			AllowedTypes []string `delim:"|"`
+			AllowedTypes string
 			FileMaxSize  int64
 			MaxFiles     int
 		}{
 			Enabled:      true,
 			TempPath:     "data/tmp/uploads",
-			AllowedTypes: []string{},
+			AllowedTypes: "",
 			FileMaxSize:  3,
 			MaxFiles:     5,
 		},
@@ -213,6 +217,12 @@ var (
 			LockReasons: strings.Split("Too heated,Off-topic,Spam,Resolved", ","),
 		},
 
+		Release: struct {
+			AllowedTypes string
+		}{
+			AllowedTypes: "",
+		},
+
 		// Signing settings
 		Signing: struct {
 			SigningKey        string