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