// 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 repo import ( "bufio" "fmt" "html" "path" "strings" "code.gitea.io/gitea/models" "code.gitea.io/gitea/modules/base" "code.gitea.io/gitea/modules/context" "code.gitea.io/gitea/modules/git" "code.gitea.io/gitea/modules/log" "code.gitea.io/gitea/modules/setting" "code.gitea.io/gitea/modules/upload" "code.gitea.io/gitea/services/gitdiff" ) const ( tplCompare base.TplName = "repo/diff/compare" tplBlobExcerpt base.TplName = "repo/diff/blob_excerpt" ) // setPathsCompareContext sets context data for source and raw paths func setPathsCompareContext(ctx *context.Context, base *git.Commit, head *git.Commit, headTarget string) { sourcePath := setting.AppSubURL + "/%s/src/commit/%s" rawPath := setting.AppSubURL + "/%s/raw/commit/%s" ctx.Data["SourcePath"] = fmt.Sprintf(sourcePath, headTarget, head.ID) ctx.Data["RawPath"] = fmt.Sprintf(rawPath, headTarget, head.ID) if base != nil { baseTarget := path.Join(ctx.Repo.Owner.Name, ctx.Repo.Repository.Name) ctx.Data["BeforeSourcePath"] = fmt.Sprintf(sourcePath, baseTarget, base.ID) ctx.Data["BeforeRawPath"] = fmt.Sprintf(rawPath, baseTarget, base.ID) } } // setImageCompareContext sets context data that is required by image compare template func setImageCompareContext(ctx *context.Context, base *git.Commit, head *git.Commit) { ctx.Data["IsImageFileInHead"] = head.IsImageFile ctx.Data["IsImageFileInBase"] = base.IsImageFile ctx.Data["ImageInfoBase"] = func(name string) *git.ImageMetaData { if base == nil { return nil } result, err := base.ImageInfo(name) if err != nil { log.Error("ImageInfo failed: %v", err) return nil } return result } ctx.Data["ImageInfo"] = func(name string) *git.ImageMetaData { result, err := head.ImageInfo(name) if err != nil { log.Error("ImageInfo failed: %v", err) return nil } return result } } // ParseCompareInfo parse compare info between two commit for preparing comparing references func ParseCompareInfo(ctx *context.Context) (*models.User, *models.Repository, *git.Repository, *git.CompareInfo, string, string) { baseRepo := ctx.Repo.Repository // Get compared branches information // A full compare url is of the form: // // 1. /{:baseOwner}/{:baseRepoName}/compare/{:baseBranch}...{:headBranch} // 2. /{:baseOwner}/{:baseRepoName}/compare/{:baseBranch}...{:headOwner}:{:headBranch} // 3. /{:baseOwner}/{:baseRepoName}/compare/{:baseBranch}...{:headOwner}/{:headRepoName}:{:headBranch} // // Here we obtain the infoPath "{:baseBranch}...[{:headOwner}/{:headRepoName}:]{:headBranch}" as ctx.Params("*") // with the :baseRepo in ctx.Repo. // // Note: Generally :headRepoName is not provided here - we are only passed :headOwner. // // How do we determine the :headRepo? // // 1. If :headOwner is not set then the :headRepo = :baseRepo // 2. If :headOwner is set - then look for the fork of :baseRepo owned by :headOwner // 3. But... :baseRepo could be a fork of :headOwner's repo - so check that // 4. Now, :baseRepo and :headRepos could be forks of the same repo - so check that // // format: <base branch>...[<head repo>:]<head branch> // base<-head: master...head:feature // same repo: master...feature var ( headUser *models.User headRepo *models.Repository headBranch string isSameRepo bool infoPath string err error ) infoPath = ctx.Params("*") infos := strings.SplitN(infoPath, "...", 2) if len(infos) != 2 { log.Trace("ParseCompareInfo[%d]: not enough compared branches information %s", baseRepo.ID, infos) ctx.NotFound("CompareAndPullRequest", nil) return nil, nil, nil, nil, "", "" } ctx.Data["BaseName"] = baseRepo.OwnerName baseBranch := infos[0] ctx.Data["BaseBranch"] = baseBranch // If there is no head repository, it means compare between same repository. headInfos := strings.Split(infos[1], ":") if len(headInfos) == 1 { isSameRepo = true headUser = ctx.Repo.Owner headBranch = headInfos[0] } else if len(headInfos) == 2 { headInfosSplit := strings.Split(headInfos[0], "/") if len(headInfosSplit) == 1 { headUser, err = models.GetUserByName(headInfos[0]) if err != nil { if models.IsErrUserNotExist(err) { ctx.NotFound("GetUserByName", nil) } else { ctx.ServerError("GetUserByName", err) } return nil, nil, nil, nil, "", "" } headBranch = headInfos[1] isSameRepo = headUser.ID == ctx.Repo.Owner.ID if isSameRepo { headRepo = baseRepo } } else { headRepo, err = models.GetRepositoryByOwnerAndName(headInfosSplit[0], headInfosSplit[1]) if err != nil { if models.IsErrRepoNotExist(err) { ctx.NotFound("GetRepositoryByOwnerAndName", nil) } else { ctx.ServerError("GetRepositoryByOwnerAndName", err) } return nil, nil, nil, nil, "", "" } if err := headRepo.GetOwner(); err != nil { if models.IsErrUserNotExist(err) { ctx.NotFound("GetUserByName", nil) } else { ctx.ServerError("GetUserByName", err) } return nil, nil, nil, nil, "", "" } headBranch = headInfos[1] headUser = headRepo.Owner isSameRepo = headRepo.ID == ctx.Repo.Repository.ID } } else { ctx.NotFound("CompareAndPullRequest", nil) return nil, nil, nil, nil, "", "" } ctx.Data["HeadUser"] = headUser ctx.Data["HeadBranch"] = headBranch ctx.Repo.PullRequest.SameRepo = isSameRepo // Check if base branch is valid. baseIsCommit := ctx.Repo.GitRepo.IsCommitExist(baseBranch) baseIsBranch := ctx.Repo.GitRepo.IsBranchExist(baseBranch) baseIsTag := ctx.Repo.GitRepo.IsTagExist(baseBranch) if !baseIsCommit && !baseIsBranch && !baseIsTag { // Check if baseBranch is short sha commit hash if baseCommit, _ := ctx.Repo.GitRepo.GetCommit(baseBranch); baseCommit != nil { baseBranch = baseCommit.ID.String() ctx.Data["BaseBranch"] = baseBranch baseIsCommit = true } else { ctx.NotFound("IsRefExist", nil) return nil, nil, nil, nil, "", "" } } ctx.Data["BaseIsCommit"] = baseIsCommit ctx.Data["BaseIsBranch"] = baseIsBranch ctx.Data["BaseIsTag"] = baseIsTag ctx.Data["IsPull"] = true // Now we have the repository that represents the base // The current base and head repositories and branches may not // actually be the intended branches that the user wants to // create a pull-request from - but also determining the head // repo is difficult. // We will want therefore to offer a few repositories to set as // our base and head // 1. First if the baseRepo is a fork get the "RootRepo" it was // forked from var rootRepo *models.Repository if baseRepo.IsFork { err = baseRepo.GetBaseRepo() if err != nil { if !models.IsErrRepoNotExist(err) { ctx.ServerError("Unable to find root repo", err) return nil, nil, nil, nil, "", "" } } else { rootRepo = baseRepo.BaseRepo } } // 2. Now if the current user is not the owner of the baseRepo, // check if they have a fork of the base repo and offer that as // "OwnForkRepo" var ownForkRepo *models.Repository if ctx.User != nil && baseRepo.OwnerID != ctx.User.ID { repo, has := models.HasForkedRepo(ctx.User.ID, baseRepo.ID) if has { ownForkRepo = repo ctx.Data["OwnForkRepo"] = ownForkRepo } } has := headRepo != nil // 3. If the base is a forked from "RootRepo" and the owner of // the "RootRepo" is the :headUser - set headRepo to that if !has && rootRepo != nil && rootRepo.OwnerID == headUser.ID { headRepo = rootRepo has = true } // 4. If the ctx.User has their own fork of the baseRepo and the headUser is the ctx.User // set the headRepo to the ownFork if !has && ownForkRepo != nil && ownForkRepo.OwnerID == headUser.ID { headRepo = ownForkRepo has = true } // 5. If the headOwner has a fork of the baseRepo - use that if !has { headRepo, has = models.HasForkedRepo(headUser.ID, baseRepo.ID) } // 6. If the baseRepo is a fork and the headUser has a fork of that use that if !has && baseRepo.IsFork { headRepo, has = models.HasForkedRepo(headUser.ID, baseRepo.ForkID) } // 7. Otherwise if we're not the same repo and haven't found a repo give up if !isSameRepo && !has { ctx.Data["PageIsComparePull"] = false } // 8. Finally open the git repo var headGitRepo *git.Repository if isSameRepo { headRepo = ctx.Repo.Repository headGitRepo = ctx.Repo.GitRepo } else if has { headGitRepo, err = git.OpenRepository(headRepo.RepoPath()) if err != nil { ctx.ServerError("OpenRepository", err) return nil, nil, nil, nil, "", "" } defer headGitRepo.Close() } ctx.Data["HeadRepo"] = headRepo // Now we need to assert that the ctx.User has permission to read // the baseRepo's code and pulls // (NOT headRepo's) permBase, err := models.GetUserRepoPermission(baseRepo, ctx.User) if err != nil { ctx.ServerError("GetUserRepoPermission", err) return nil, nil, nil, nil, "", "" } if !permBase.CanRead(models.UnitTypeCode) { if log.IsTrace() { log.Trace("Permission Denied: User: %-v cannot read code in Repo: %-v\nUser in baseRepo has Permissions: %-+v", ctx.User, baseRepo, permBase) } ctx.NotFound("ParseCompareInfo", nil) return nil, nil, nil, nil, "", "" } // If we're not merging from the same repo: if !isSameRepo { // Assert ctx.User has permission to read headRepo's codes permHead, err := models.GetUserRepoPermission(headRepo, ctx.User) if err != nil { ctx.ServerError("GetUserRepoPermission", err) return nil, nil, nil, nil, "", "" } if !permHead.CanRead(models.UnitTypeCode) { if log.IsTrace() { log.Trace("Permission Denied: User: %-v cannot read code in Repo: %-v\nUser in headRepo has Permissions: %-+v", ctx.User, headRepo, permHead) } ctx.NotFound("ParseCompareInfo", nil) return nil, nil, nil, nil, "", "" } } // If we have a rootRepo and it's different from: // 1. the computed base // 2. the computed head // then get the branches of it if rootRepo != nil && rootRepo.ID != headRepo.ID && rootRepo.ID != baseRepo.ID { perm, branches, err := getBranchesForRepo(ctx.User, rootRepo) if err != nil { ctx.ServerError("GetBranchesForRepo", err) return nil, nil, nil, nil, "", "" } if perm { ctx.Data["RootRepo"] = rootRepo ctx.Data["RootRepoBranches"] = branches } } // If we have a ownForkRepo and it's different from: // 1. The computed base // 2. The computed hea // 3. The rootRepo (if we have one) // then get the branches from it. if ownForkRepo != nil && ownForkRepo.ID != headRepo.ID && ownForkRepo.ID != baseRepo.ID && (rootRepo == nil || ownForkRepo.ID != rootRepo.ID) { perm, branches, err := getBranchesForRepo(ctx.User, ownForkRepo) if err != nil { ctx.ServerError("GetBranchesForRepo", err) return nil, nil, nil, nil, "", "" } if perm { ctx.Data["OwnForkRepo"] = ownForkRepo ctx.Data["OwnForkRepoBranches"] = branches } } // Check if head branch is valid. headIsCommit := headGitRepo.IsCommitExist(headBranch) headIsBranch := headGitRepo.IsBranchExist(headBranch) headIsTag := headGitRepo.IsTagExist(headBranch) if !headIsCommit && !headIsBranch && !headIsTag { // Check if headBranch is short sha commit hash if headCommit, _ := headGitRepo.GetCommit(headBranch); headCommit != nil { headBranch = headCommit.ID.String() ctx.Data["HeadBranch"] = headBranch headIsCommit = true } else { ctx.NotFound("IsRefExist", nil) return nil, nil, nil, nil, "", "" } } ctx.Data["HeadIsCommit"] = headIsCommit ctx.Data["HeadIsBranch"] = headIsBranch ctx.Data["HeadIsTag"] = headIsTag // Treat as pull request if both references are branches if ctx.Data["PageIsComparePull"] == nil { ctx.Data["PageIsComparePull"] = headIsBranch && baseIsBranch } if ctx.Data["PageIsComparePull"] == true && !permBase.CanReadIssuesOrPulls(true) { if log.IsTrace() { log.Trace("Permission Denied: User: %-v cannot create/read pull requests in Repo: %-v\nUser in baseRepo has Permissions: %-+v", ctx.User, baseRepo, permBase) } ctx.NotFound("ParseCompareInfo", nil) return nil, nil, nil, nil, "", "" } baseBranchRef := baseBranch if baseIsBranch { baseBranchRef = git.BranchPrefix + baseBranch } else if baseIsTag { baseBranchRef = git.TagPrefix + baseBranch } headBranchRef := headBranch if headIsBranch { headBranchRef = git.BranchPrefix + headBranch } else if headIsTag { headBranchRef = git.TagPrefix + headBranch } compareInfo, err := headGitRepo.GetCompareInfo(baseRepo.RepoPath(), baseBranchRef, headBranchRef) if err != nil { ctx.ServerError("GetCompareInfo", err) return nil, nil, nil, nil, "", "" } ctx.Data["BeforeCommitID"] = compareInfo.MergeBase return headUser, headRepo, headGitRepo, compareInfo, baseBranch, headBranch } // PrepareCompareDiff renders compare diff page func PrepareCompareDiff( ctx *context.Context, headUser *models.User, headRepo *models.Repository, headGitRepo *git.Repository, compareInfo *git.CompareInfo, baseBranch, headBranch string, whitespaceBehavior string) bool { var ( repo = ctx.Repo.Repository err error title string ) // Get diff information. ctx.Data["CommitRepoLink"] = headRepo.Link() headCommitID := compareInfo.HeadCommitID ctx.Data["AfterCommitID"] = headCommitID if headCommitID == compareInfo.MergeBase { ctx.Data["IsNothingToCompare"] = true if unit, err := repo.GetUnit(models.UnitTypePullRequests); err == nil { config := unit.PullRequestsConfig() if !config.AutodetectManualMerge { ctx.Data["AllowEmptyPr"] = !(baseBranch == headBranch && ctx.Repo.Repository.Name == headRepo.Name) } else { ctx.Data["AllowEmptyPr"] = false } } return true } diff, err := gitdiff.GetDiffRangeWithWhitespaceBehavior(models.RepoPath(headUser.Name, headRepo.Name), compareInfo.MergeBase, headCommitID, setting.Git.MaxGitDiffLines, setting.Git.MaxGitDiffLineCharacters, setting.Git.MaxGitDiffFiles, whitespaceBehavior) if err != nil { ctx.ServerError("GetDiffRangeWithWhitespaceBehavior", err) return false } ctx.Data["Diff"] = diff ctx.Data["DiffNotAvailable"] = diff.NumFiles == 0 headCommit, err := headGitRepo.GetCommit(headCommitID) if err != nil { ctx.ServerError("GetCommit", err) return false } baseGitRepo := ctx.Repo.GitRepo baseCommitID := compareInfo.BaseCommitID baseCommit, err := baseGitRepo.GetCommit(baseCommitID) if err != nil { ctx.ServerError("GetCommit", err) return false } compareInfo.Commits = models.ValidateCommitsWithEmails(compareInfo.Commits) compareInfo.Commits = models.ParseCommitsWithSignature(compareInfo.Commits, headRepo) compareInfo.Commits = models.ParseCommitsWithStatus(compareInfo.Commits, headRepo) ctx.Data["Commits"] = compareInfo.Commits ctx.Data["CommitCount"] = compareInfo.Commits.Len() if compareInfo.Commits.Len() == 1 { c := compareInfo.Commits.Front().Value.(models.SignCommitWithStatuses) title = strings.TrimSpace(c.UserCommit.Summary()) body := strings.Split(strings.TrimSpace(c.UserCommit.Message()), "\n") if len(body) > 1 { ctx.Data["content"] = strings.Join(body[1:], "\n") } } else { title = headBranch } ctx.Data["title"] = title ctx.Data["Username"] = headUser.Name ctx.Data["Reponame"] = headRepo.Name setImageCompareContext(ctx, baseCommit, headCommit) headTarget := path.Join(headUser.Name, repo.Name) setPathsCompareContext(ctx, baseCommit, headCommit, headTarget) return false } func getBranchesForRepo(user *models.User, repo *models.Repository) (bool, []string, error) { perm, err := models.GetUserRepoPermission(repo, user) if err != nil { return false, nil, err } if !perm.CanRead(models.UnitTypeCode) { return false, nil, nil } gitRepo, err := git.OpenRepository(repo.RepoPath()) if err != nil { return false, nil, err } defer gitRepo.Close() branches, _, err := gitRepo.GetBranches(0, 0) if err != nil { return false, nil, err } return true, branches, nil } // CompareDiff show different from one commit to another commit func CompareDiff(ctx *context.Context) { headUser, headRepo, headGitRepo, compareInfo, baseBranch, headBranch := ParseCompareInfo(ctx) if ctx.Written() { return } defer headGitRepo.Close() nothingToCompare := PrepareCompareDiff(ctx, headUser, headRepo, headGitRepo, compareInfo, baseBranch, headBranch, gitdiff.GetWhitespaceFlag(ctx.Data["WhitespaceBehavior"].(string))) if ctx.Written() { return } if ctx.Data["PageIsComparePull"] == true { headBranches, _, err := headGitRepo.GetBranches(0, 0) if err != nil { ctx.ServerError("GetBranches", err) return } ctx.Data["HeadBranches"] = headBranches pr, err := models.GetUnmergedPullRequest(headRepo.ID, ctx.Repo.Repository.ID, headBranch, baseBranch) if err != nil { if !models.IsErrPullRequestNotExist(err) { ctx.ServerError("GetUnmergedPullRequest", err) return } } else { ctx.Data["HasPullRequest"] = true ctx.Data["PullRequest"] = pr ctx.HTML(200, tplCompareDiff) return } if !nothingToCompare { // Setup information for new form. RetrieveRepoMetas(ctx, ctx.Repo.Repository, true) if ctx.Written() { return } } } beforeCommitID := ctx.Data["BeforeCommitID"].(string) afterCommitID := ctx.Data["AfterCommitID"].(string) ctx.Data["Title"] = "Comparing " + base.ShortSha(beforeCommitID) + "..." + base.ShortSha(afterCommitID) ctx.Data["IsRepoToolbarCommits"] = true ctx.Data["IsDiffCompare"] = true ctx.Data["RequireTribute"] = true ctx.Data["RequireSimpleMDE"] = true ctx.Data["PullRequestWorkInProgressPrefixes"] = setting.Repository.PullRequest.WorkInProgressPrefixes setTemplateIfExists(ctx, pullRequestTemplateKey, nil, pullRequestTemplateCandidates) ctx.Data["IsAttachmentEnabled"] = setting.Attachment.Enabled upload.AddUploadContext(ctx, "comment") ctx.Data["HasIssuesOrPullsWritePermission"] = ctx.Repo.CanWrite(models.UnitTypePullRequests) ctx.HTML(200, tplCompare) } // ExcerptBlob render blob excerpt contents func ExcerptBlob(ctx *context.Context) { commitID := ctx.Params("sha") lastLeft := ctx.QueryInt("last_left") lastRight := ctx.QueryInt("last_right") idxLeft := ctx.QueryInt("left") idxRight := ctx.QueryInt("right") leftHunkSize := ctx.QueryInt("left_hunk_size") rightHunkSize := ctx.QueryInt("right_hunk_size") anchor := ctx.Query("anchor") direction := ctx.Query("direction") filePath := ctx.Query("path") gitRepo := ctx.Repo.GitRepo chunkSize := gitdiff.BlobExcerptChunkSize commit, err := gitRepo.GetCommit(commitID) if err != nil { ctx.Error(500, "GetCommit") return } section := &gitdiff.DiffSection{ FileName: filePath, Name: filePath, } if direction == "up" && (idxLeft-lastLeft) > chunkSize { idxLeft -= chunkSize idxRight -= chunkSize leftHunkSize += chunkSize rightHunkSize += chunkSize section.Lines, err = getExcerptLines(commit, filePath, idxLeft-1, idxRight-1, chunkSize) } else if direction == "down" && (idxLeft-lastLeft) > chunkSize { section.Lines, err = getExcerptLines(commit, filePath, lastLeft, lastRight, chunkSize) lastLeft += chunkSize lastRight += chunkSize } else { section.Lines, err = getExcerptLines(commit, filePath, lastLeft, lastRight, idxRight-lastRight-1) leftHunkSize = 0 rightHunkSize = 0 idxLeft = lastLeft idxRight = lastRight } if err != nil { ctx.Error(500, "getExcerptLines") return } if idxRight > lastRight { lineText := " " if rightHunkSize > 0 || leftHunkSize > 0 { lineText = fmt.Sprintf("@@ -%d,%d +%d,%d @@\n", idxLeft, leftHunkSize, idxRight, rightHunkSize) } lineText = html.EscapeString(lineText) lineSection := &gitdiff.DiffLine{ Type: gitdiff.DiffLineSection, Content: lineText, SectionInfo: &gitdiff.DiffLineSectionInfo{ Path: filePath, LastLeftIdx: lastLeft, LastRightIdx: lastRight, LeftIdx: idxLeft, RightIdx: idxRight, LeftHunkSize: leftHunkSize, RightHunkSize: rightHunkSize, }} if direction == "up" { section.Lines = append([]*gitdiff.DiffLine{lineSection}, section.Lines...) } else if direction == "down" { section.Lines = append(section.Lines, lineSection) } } ctx.Data["section"] = section ctx.Data["fileName"] = filePath ctx.Data["AfterCommitID"] = commitID ctx.Data["Anchor"] = anchor ctx.HTML(200, tplBlobExcerpt) } func getExcerptLines(commit *git.Commit, filePath string, idxLeft int, idxRight int, chunkSize int) ([]*gitdiff.DiffLine, error) { blob, err := commit.Tree.GetBlobByPath(filePath) if err != nil { return nil, err } reader, err := blob.DataAsync() if err != nil { return nil, err } defer reader.Close() scanner := bufio.NewScanner(reader) var diffLines []*gitdiff.DiffLine for line := 0; line < idxRight+chunkSize; line++ { if ok := scanner.Scan(); !ok { break } if line < idxRight { continue } lineText := scanner.Text() diffLine := &gitdiff.DiffLine{ LeftIdx: idxLeft + (line - idxRight) + 1, RightIdx: line + 1, Type: gitdiff.DiffLinePlain, Content: " " + lineText, } diffLines = append(diffLines, diffLine) } return diffLines, nil }