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// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package upload
import (
"mime"
"net/http"
"net/url"
"path"
"regexp"
"strings"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/services/context"
)
// ErrFileTypeForbidden not allowed file type error
type ErrFileTypeForbidden struct {
Type string
}
// IsErrFileTypeForbidden checks if an error is a ErrFileTypeForbidden.
func IsErrFileTypeForbidden(err error) bool {
_, ok := err.(ErrFileTypeForbidden)
return ok
}
func (err ErrFileTypeForbidden) Error() string {
return "This file extension or type is not allowed to be uploaded."
}
var wildcardTypeRe = regexp.MustCompile(`^[a-z]+/\*$`)
// Verify validates whether a file is allowed to be uploaded.
func Verify(buf []byte, fileName, allowedTypesStr string) error {
allowedTypesStr = strings.ReplaceAll(allowedTypesStr, "|", ",") // compat for old config format
allowedTypes := []string{}
for _, entry := range strings.Split(allowedTypesStr, ",") {
entry = strings.ToLower(strings.TrimSpace(entry))
if entry != "" {
allowedTypes = append(allowedTypes, entry)
}
}
if len(allowedTypes) == 0 {
return nil // everything is allowed
}
fullMimeType := http.DetectContentType(buf)
mimeType, _, err := mime.ParseMediaType(fullMimeType)
if err != nil {
log.Warn("Detected attachment type could not be parsed %s", fullMimeType)
return ErrFileTypeForbidden{Type: fullMimeType}
}
extension := strings.ToLower(path.Ext(fileName))
// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/file#Unique_file_type_specifiers
for _, allowEntry := range allowedTypes {
if allowEntry == "*/*" {
return nil // everything allowed
} else if strings.HasPrefix(allowEntry, ".") && allowEntry == extension {
return nil // extension is allowed
} else if mimeType == allowEntry {
return nil // mime type is allowed
} else if wildcardTypeRe.MatchString(allowEntry) && strings.HasPrefix(mimeType, allowEntry[:len(allowEntry)-1]) {
return nil // wildcard match, e.g. image/*
}
}
log.Info("Attachment with type %s blocked from upload", fullMimeType)
return ErrFileTypeForbidden{Type: fullMimeType}
}
// AddUploadContext renders template values for dropzone
func AddUploadContext(ctx *context.Context, uploadType string) {
if uploadType == "release" {
ctx.Data["UploadUrl"] = ctx.Repo.RepoLink + "/releases/attachments"
ctx.Data["UploadRemoveUrl"] = ctx.Repo.RepoLink + "/releases/attachments/remove"
ctx.Data["UploadLinkUrl"] = ctx.Repo.RepoLink + "/releases/attachments"
ctx.Data["UploadAccepts"] = strings.ReplaceAll(setting.Repository.Release.AllowedTypes, "|", ",")
ctx.Data["UploadMaxFiles"] = setting.Attachment.MaxFiles
ctx.Data["UploadMaxSize"] = setting.Attachment.MaxSize
} else if uploadType == "comment" {
ctx.Data["UploadUrl"] = ctx.Repo.RepoLink + "/issues/attachments"
ctx.Data["UploadRemoveUrl"] = ctx.Repo.RepoLink + "/issues/attachments/remove"
if len(ctx.Params(":index")) > 0 {
ctx.Data["UploadLinkUrl"] = ctx.Repo.RepoLink + "/issues/" + url.PathEscape(ctx.Params(":index")) + "/attachments"
} else {
ctx.Data["UploadLinkUrl"] = ctx.Repo.RepoLink + "/issues/attachments"
}
ctx.Data["UploadAccepts"] = strings.ReplaceAll(setting.Attachment.AllowedTypes, "|", ",")
ctx.Data["UploadMaxFiles"] = setting.Attachment.MaxFiles
ctx.Data["UploadMaxSize"] = setting.Attachment.MaxSize
} else if uploadType == "repo" {
ctx.Data["UploadUrl"] = ctx.Repo.RepoLink + "/upload-file"
ctx.Data["UploadRemoveUrl"] = ctx.Repo.RepoLink + "/upload-remove"
ctx.Data["UploadLinkUrl"] = ctx.Repo.RepoLink + "/upload-file"
ctx.Data["UploadAccepts"] = strings.ReplaceAll(setting.Repository.Upload.AllowedTypes, "|", ",")
ctx.Data["UploadMaxFiles"] = setting.Repository.Upload.MaxFiles
ctx.Data["UploadMaxSize"] = setting.Repository.Upload.FileMaxSize
}
}
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