1 files changed, 209 insertions, 0 deletions
diff --git a/modules/repofiles/delete.go b/modules/repofiles/delete.go
new file mode 100644
index 0000000000..ce7993dc54
--- /dev/null
+++ b/modules/repofiles/delete.go
@@ -0,0 +1,209 @@
+// 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 (
+	"fmt"
+	"strings"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/git"
+	api "code.gitea.io/sdk/gitea"
+)
+
+// DeleteRepoFileOptions holds the repository delete file options
+type DeleteRepoFileOptions struct {
+	LastCommitID string
+	OldBranch    string
+	NewBranch    string
+	TreePath     string
+	Message      string
+	SHA          string
+	Author       *IdentityOptions
+	Committer    *IdentityOptions
+}
+
+// DeleteRepoFile deletes a file in the given repository
+func DeleteRepoFile(repo *models.Repository, doer *models.User, opts *DeleteRepoFileOptions) (*api.FileResponse, error) {
+	// If no branch name is set, assume the repo's default branch
+	if opts.OldBranch == "" {
+		opts.OldBranch = repo.DefaultBranch
+	}
+	if opts.NewBranch == "" {
+		opts.NewBranch = opts.OldBranch
+	}
+
+	// oldBranch must exist for this operation
+	if _, err := repo.GetBranch(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 {
+		newBranch, err := repo.GetBranch(opts.NewBranch)
+		if git.IsErrNotExist(err) {
+			return nil, err
+		}
+		if newBranch != nil {
+			return nil, models.ErrBranchAlreadyExists{
+				BranchName: opts.NewBranch,
+			}
+		}
+	} else {
+		if protected, _ := repo.IsProtectedBranchForPush(opts.OldBranch, doer); protected {
+			return nil, models.ErrUserCannotCommit{
+				UserName: doer.LowerName,
+			}
+		}
+	}
+
+	// Check that the path given in opts.treeName is valid (not a git path)
+	treePath := CleanUploadFileName(opts.TreePath)
+	if treePath == "" {
+		return nil, models.ErrFilenameInvalid{
+			Path: opts.TreePath,
+		}
+	}
+
+	message := strings.TrimSpace(opts.Message)
+
+	author, committer := GetAuthorAndCommitterUsers(opts.Committer, opts.Author, doer)
+
+	t, err := NewTemporaryUploadRepository(repo)
+	defer t.Close()
+	if err != nil {
+		return nil, err
+	}
+	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()
+	}
+
+	// Get the files in the index
+	filesInIndex, err := t.LsFiles(opts.TreePath)
+	if err != nil {
+		return nil, fmt.Errorf("DeleteRepoFile: %v", err)
+	}
+
+	// Find the file we want to delete in the index
+	inFilelist := false
+	for _, file := range filesInIndex {
+		if file == opts.TreePath {
+			inFilelist = true
+			break
+		}
+	}
+	if !inFilelist {
+		return nil, models.ErrRepoFileDoesNotExist{
+			Path: opts.TreePath,
+		}
+	}
+
+	// Get the entry of treePath and check if the SHA given is the same as the file
+	entry, err := commit.GetTreeEntryByPath(treePath)
+	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 != entry.ID.String() {
+			return nil, models.ErrSHADoesNotMatch{
+				Path:       treePath,
+				GivenSHA:   opts.SHA,
+				CurrentSHA: entry.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 {
+			// CommitIDs don't match, but we don't want to throw a ErrCommitIDDoesNotMatch unless
+			// this specific file has been edited since opts.LastCommitID
+			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 deleting 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{}
+	}
+
+	// Remove the file from the index
+	if err := t.RemoveFilesFromIndex(opts.TreePath); err != nil {
+		return nil, err
+	}
+
+	// Now write the tree
+	treeHash, err := t.WriteTree()
+	if err != nil {
+		return nil, err
+	}
+
+	// Now commit the tree
+	commitHash, err := t.CommitTree(author, committer, treeHash, message)
+	if err != nil {
+		return nil, err
+	}
+
+	// Then push this tree to NewBranch
+	if err := t.Push(doer, commitHash, opts.NewBranch); err != nil {
+		return nil, err
+	}
+
+	// Simulate push event.
+	oldCommitID := opts.LastCommitID
+	if opts.NewBranch != opts.OldBranch {
+		oldCommitID = git.EmptySHA
+	}
+
+	if err = repo.GetOwner(); err != nil {
+		return nil, fmt.Errorf("GetOwner: %v", err)
+	}
+	err = models.PushUpdate(
+		opts.NewBranch,
+		models.PushUpdateOptions{
+			PusherID:     doer.ID,
+			PusherName:   doer.Name,
+			RepoUserName: repo.Owner.Name,
+			RepoName:     repo.Name,
+			RefFullName:  git.BranchPrefix + opts.NewBranch,
+			OldCommitID:  oldCommitID,
+			NewCommitID:  commitHash,
+		},
+	)
+	if err != nil {
+		return nil, fmt.Errorf("PushUpdate: %v", err)
+	}
+
+	// FIXME: Should we UpdateRepoIndexer(repo) here?
+
+	file, err := GetFileResponseFromCommit(repo, commit, opts.NewBranch, treePath)
+	if err != nil {
+		return nil, err
+	}
+	return file, nil
+}