gitea/modules/repofiles/update.go
zeripath 4979f15c3f
Add configurable Trust Models (#11712)
* Add configurable Trust Models

Gitea's default signature verification model differs from GitHub. GitHub
uses signatures to verify that the committer is who they say they are -
meaning that when GitHub makes a signed commit it must be the committer.
The GitHub model prevents re-publishing of commits after revocation of a
key and prevents re-signing of other people's commits to create a
completely trusted repository signed by one key or a set of trusted
keys.

The default behaviour of Gitea in contrast is to always display the
avatar and information related to a signature. This allows signatures to
be decoupled from the committer. That being said, allowing arbitary
users to present other peoples commits as theirs is not necessarily
desired therefore we have a trust model whereby signatures from
collaborators are marked trusted, signatures matching the commit line
are marked untrusted and signatures that match a user in the db but not
the committer line are marked unmatched.

The problem with this model is that this conflicts with Github therefore
we need to provide an option to allow users to choose the Github model
should they wish to.

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Adjust locale strings

Signed-off-by: Andrew Thornton <art27@cantab.net>

* as per @6543

Co-authored-by: 6543 <6543@obermui.de>

* Update models/gpg_key.go

* Add migration for repository

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
2020-09-20 00:44:55 +08:00

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// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package repofiles
import (
"bytes"
"fmt"
"path"
"strings"
"time"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/charset"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/lfs"
"code.gitea.io/gitea/modules/log"
repo_module "code.gitea.io/gitea/modules/repository"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/storage"
"code.gitea.io/gitea/modules/structs"
stdcharset "golang.org/x/net/html/charset"
"golang.org/x/text/transform"
)
// IdentityOptions for a person's identity like an author or committer
type IdentityOptions struct {
Name string
Email string
}
// CommitDateOptions store dates for GIT_AUTHOR_DATE and GIT_COMMITTER_DATE
type CommitDateOptions struct {
Author time.Time
Committer time.Time
}
// UpdateRepoFileOptions holds the repository file update options
type UpdateRepoFileOptions struct {
LastCommitID string
OldBranch string
NewBranch string
TreePath string
FromTreePath string
Message string
Content string
SHA string
IsNewFile bool
Author *IdentityOptions
Committer *IdentityOptions
Dates *CommitDateOptions
}
func detectEncodingAndBOM(entry *git.TreeEntry, repo *models.Repository) (string, bool) {
reader, err := entry.Blob().DataAsync()
if err != nil {
// return default
return "UTF-8", false
}
defer reader.Close()
buf := make([]byte, 1024)
n, err := reader.Read(buf)
if err != nil {
// return default
return "UTF-8", false
}
buf = buf[:n]
if setting.LFS.StartServer {
meta := lfs.IsPointerFile(&buf)
if meta != nil {
meta, err = repo.GetLFSMetaObjectByOid(meta.Oid)
if err != nil && err != models.ErrLFSObjectNotExist {
// return default
return "UTF-8", false
}
}
if meta != nil {
dataRc, err := lfs.ReadMetaObject(meta)
if err != nil {
// return default
return "UTF-8", false
}
defer dataRc.Close()
buf = make([]byte, 1024)
n, err = dataRc.Read(buf)
if err != nil {
// return default
return "UTF-8", false
}
buf = buf[:n]
}
}
encoding, err := charset.DetectEncoding(buf)
if err != nil {
// just default to utf-8 and no bom
return "UTF-8", false
}
if encoding == "UTF-8" {
return encoding, bytes.Equal(buf[0:3], charset.UTF8BOM)
}
charsetEncoding, _ := stdcharset.Lookup(encoding)
if charsetEncoding == nil {
return "UTF-8", false
}
result, n, err := transform.String(charsetEncoding.NewDecoder(), string(buf))
if err != nil {
// return default
return "UTF-8", false
}
if n > 2 {
return encoding, bytes.Equal([]byte(result)[0:3], charset.UTF8BOM)
}
return encoding, false
}
// CreateOrUpdateRepoFile adds or updates a file in the given repository
func CreateOrUpdateRepoFile(repo *models.Repository, doer *models.User, opts *UpdateRepoFileOptions) (*structs.FileResponse, error) {
// If no branch name is set, assume master
if opts.OldBranch == "" {
opts.OldBranch = repo.DefaultBranch
}
if opts.NewBranch == "" {
opts.NewBranch = opts.OldBranch
}
// oldBranch must exist for this operation
if _, err := repo_module.GetBranch(repo, opts.OldBranch); err != nil {
return nil, err
}
// A NewBranch can be specified for the file to be created/updated in a new branch.
// Check to make sure the branch does not already exist, otherwise we can't proceed.
// If we aren't branching to a new branch, make sure user can commit to the given branch
if opts.NewBranch != opts.OldBranch {
existingBranch, err := repo_module.GetBranch(repo, opts.NewBranch)
if existingBranch != nil {
return nil, models.ErrBranchAlreadyExists{
BranchName: opts.NewBranch,
}
}
if err != nil && !git.IsErrBranchNotExist(err) {
return nil, err
}
} else {
protectedBranch, err := repo.GetBranchProtection(opts.OldBranch)
if err != nil {
return nil, err
}
if protectedBranch != nil {
if !protectedBranch.CanUserPush(doer.ID) {
return nil, models.ErrUserCannotCommit{
UserName: doer.LowerName,
}
}
if protectedBranch.RequireSignedCommits {
_, _, _, err := repo.SignCRUDAction(doer, repo.RepoPath(), opts.OldBranch)
if err != nil {
if !models.IsErrWontSign(err) {
return nil, err
}
return nil, models.ErrUserCannotCommit{
UserName: doer.LowerName,
}
}
}
patterns := protectedBranch.GetProtectedFilePatterns()
for _, pat := range patterns {
if pat.Match(strings.ToLower(opts.TreePath)) {
return nil, models.ErrFilePathProtected{
Path: opts.TreePath,
}
}
}
}
}
// If FromTreePath is not set, set it to the opts.TreePath
if opts.TreePath != "" && opts.FromTreePath == "" {
opts.FromTreePath = opts.TreePath
}
// Check that the path given in opts.treePath is valid (not a git path)
treePath := CleanUploadFileName(opts.TreePath)
if treePath == "" {
return nil, models.ErrFilenameInvalid{
Path: opts.TreePath,
}
}
// If there is a fromTreePath (we are copying it), also clean it up
fromTreePath := CleanUploadFileName(opts.FromTreePath)
if fromTreePath == "" && opts.FromTreePath != "" {
return nil, models.ErrFilenameInvalid{
Path: opts.FromTreePath,
}
}
message := strings.TrimSpace(opts.Message)
author, committer := GetAuthorAndCommitterUsers(opts.Author, opts.Committer, doer)
t, err := NewTemporaryUploadRepository(repo)
if err != nil {
log.Error("%v", err)
}
defer t.Close()
if err := t.Clone(opts.OldBranch); err != nil {
return nil, err
}
if err := t.SetDefaultIndex(); err != nil {
return nil, err
}
// Get the commit of the original branch
commit, err := t.GetBranchCommit(opts.OldBranch)
if err != nil {
return nil, err // Couldn't get a commit for the branch
}
// Assigned LastCommitID in opts if it hasn't been set
if opts.LastCommitID == "" {
opts.LastCommitID = commit.ID.String()
} else {
lastCommitID, err := t.gitRepo.ConvertToSHA1(opts.LastCommitID)
if err != nil {
return nil, fmt.Errorf("DeleteRepoFile: Invalid last commit ID: %v", err)
}
opts.LastCommitID = lastCommitID.String()
}
encoding := "UTF-8"
bom := false
executable := false
if !opts.IsNewFile {
fromEntry, err := commit.GetTreeEntryByPath(fromTreePath)
if err != nil {
return nil, err
}
if opts.SHA != "" {
// If a SHA was given and the SHA given doesn't match the SHA of the fromTreePath, throw error
if opts.SHA != fromEntry.ID.String() {
return nil, models.ErrSHADoesNotMatch{
Path: treePath,
GivenSHA: opts.SHA,
CurrentSHA: fromEntry.ID.String(),
}
}
} else if opts.LastCommitID != "" {
// If a lastCommitID was given and it doesn't match the commitID of the head of the branch throw
// an error, but only if we aren't creating a new branch.
if commit.ID.String() != opts.LastCommitID && opts.OldBranch == opts.NewBranch {
if changed, err := commit.FileChangedSinceCommit(treePath, opts.LastCommitID); err != nil {
return nil, err
} else if changed {
return nil, models.ErrCommitIDDoesNotMatch{
GivenCommitID: opts.LastCommitID,
CurrentCommitID: opts.LastCommitID,
}
}
// The file wasn't modified, so we are good to delete it
}
} else {
// When updating a file, a lastCommitID or SHA needs to be given to make sure other commits
// haven't been made. We throw an error if one wasn't provided.
return nil, models.ErrSHAOrCommitIDNotProvided{}
}
encoding, bom = detectEncodingAndBOM(fromEntry, repo)
executable = fromEntry.IsExecutable()
}
// For the path where this file will be created/updated, we need to make
// sure no parts of the path are existing files or links except for the last
// item in the path which is the file name, and that shouldn't exist IF it is
// a new file OR is being moved to a new path.
treePathParts := strings.Split(treePath, "/")
subTreePath := ""
for index, part := range treePathParts {
subTreePath = path.Join(subTreePath, part)
entry, err := commit.GetTreeEntryByPath(subTreePath)
if err != nil {
if git.IsErrNotExist(err) {
// Means there is no item with that name, so we're good
break
}
return nil, err
}
if index < len(treePathParts)-1 {
if !entry.IsDir() {
return nil, models.ErrFilePathInvalid{
Message: fmt.Sprintf("a file exists where you’re trying to create a subdirectory [path: %s]", subTreePath),
Path: subTreePath,
Name: part,
Type: git.EntryModeBlob,
}
}
} else if entry.IsLink() {
return nil, models.ErrFilePathInvalid{
Message: fmt.Sprintf("a symbolic link exists where you’re trying to create a subdirectory [path: %s]", subTreePath),
Path: subTreePath,
Name: part,
Type: git.EntryModeSymlink,
}
} else if entry.IsDir() {
return nil, models.ErrFilePathInvalid{
Message: fmt.Sprintf("a directory exists where you’re trying to create a file [path: %s]", subTreePath),
Path: subTreePath,
Name: part,
Type: git.EntryModeTree,
}
} else if fromTreePath != treePath || opts.IsNewFile {
// The entry shouldn't exist if we are creating new file or moving to a new path
return nil, models.ErrRepoFileAlreadyExists{
Path: treePath,
}
}
}
// Get the two paths (might be the same if not moving) from the index if they exist
filesInIndex, err := t.LsFiles(opts.TreePath, opts.FromTreePath)
if err != nil {
return nil, fmt.Errorf("UpdateRepoFile: %v", err)
}
// If is a new file (not updating) then the given path shouldn't exist
if opts.IsNewFile {
for _, file := range filesInIndex {
if file == opts.TreePath {
return nil, models.ErrRepoFileAlreadyExists{
Path: opts.TreePath,
}
}
}
}
// Remove the old path from the tree
if fromTreePath != treePath && len(filesInIndex) > 0 {
for _, file := range filesInIndex {
if file == fromTreePath {
if err := t.RemoveFilesFromIndex(opts.FromTreePath); err != nil {
return nil, err
}
}
}
}
content := opts.Content
if bom {
content = string(charset.UTF8BOM) + content
}
if encoding != "UTF-8" {
charsetEncoding, _ := stdcharset.Lookup(encoding)
if charsetEncoding != nil {
result, _, err := transform.String(charsetEncoding.NewEncoder(), content)
if err != nil {
// Look if we can't encode back in to the original we should just stick with utf-8
log.Error("Error re-encoding %s (%s) as %s - will stay as UTF-8: %v", opts.TreePath, opts.FromTreePath, encoding, err)
result = content
}
content = result
} else {
log.Error("Unknown encoding: %s", encoding)
}
}
// Reset the opts.Content to our adjusted content to ensure that LFS gets the correct content
opts.Content = content
var lfsMetaObject *models.LFSMetaObject
if setting.LFS.StartServer {
// Check there is no way this can return multiple infos
filename2attribute2info, err := t.CheckAttribute("filter", treePath)
if err != nil {
return nil, err
}
if filename2attribute2info[treePath] != nil && filename2attribute2info[treePath]["filter"] == "lfs" {
// OK so we are supposed to LFS this data!
oid, err := models.GenerateLFSOid(strings.NewReader(opts.Content))
if err != nil {
return nil, err
}
lfsMetaObject = &models.LFSMetaObject{Oid: oid, Size: int64(len(opts.Content)), RepositoryID: repo.ID}
content = lfsMetaObject.Pointer()
}
}
// Add the object to the database
objectHash, err := t.HashObject(strings.NewReader(content))
if err != nil {
return nil, err
}
// Add the object to the index
if executable {
if err := t.AddObjectToIndex("100755", objectHash, treePath); err != nil {
return nil, err
}
} else {
if err := t.AddObjectToIndex("100644", objectHash, treePath); err != nil {
return nil, err
}
}
// Now write the tree
treeHash, err := t.WriteTree()
if err != nil {
return nil, err
}
// Now commit the tree
var commitHash string
if opts.Dates != nil {
commitHash, err = t.CommitTreeWithDate(author, committer, treeHash, message, opts.Dates.Author, opts.Dates.Committer)
} else {
commitHash, err = t.CommitTree(author, committer, treeHash, message)
}
if err != nil {
return nil, err
}
if lfsMetaObject != nil {
// We have an LFS object - create it
lfsMetaObject, err = models.NewLFSMetaObject(lfsMetaObject)
if err != nil {
return nil, err
}
contentStore := &lfs.ContentStore{ObjectStorage: storage.LFS}
exist, err := contentStore.Exists(lfsMetaObject)
if err != nil {
return nil, err
}
if !exist {
if err := contentStore.Put(lfsMetaObject, strings.NewReader(opts.Content)); err != nil {
if _, err2 := repo.RemoveLFSMetaObjectByOid(lfsMetaObject.Oid); err2 != nil {
return nil, fmt.Errorf("Error whilst removing failed inserted LFS object %s: %v (Prev Error: %v)", lfsMetaObject.Oid, err2, err)
}
return nil, err
}
}
}
// Then push this tree to NewBranch
if err := t.Push(doer, commitHash, opts.NewBranch); err != nil {
log.Error("%T %v", err, err)
return nil, err
}
commit, err = t.GetCommit(commitHash)
if err != nil {
return nil, err
}
file, err := GetFileResponseFromCommit(repo, commit, opts.NewBranch, treePath)
if err != nil {
return nil, err
}
return file, nil
}