1 files changed, 99 insertions, 0 deletions
diff --git a/routers/api/v1/repo/compare.go b/routers/api/v1/repo/compare.go
new file mode 100644
index 0000000..429145c
--- /dev/null
+++ b/routers/api/v1/repo/compare.go
@@ -0,0 +1,99 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package repo
+
+import (
+	"net/http"
+	"strings"
+
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/gitrepo"
+	api "code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/services/context"
+	"code.gitea.io/gitea/services/convert"
+)
+
+// CompareDiff compare two branches or commits
+func CompareDiff(ctx *context.APIContext) {
+	// swagger:operation GET /repos/{owner}/{repo}/compare/{basehead} repository repoCompareDiff
+	// ---
+	// summary: Get commit comparison information
+	// produces:
+	// - application/json
+	// parameters:
+	// - name: owner
+	//   in: path
+	//   description: owner of the repo
+	//   type: string
+	//   required: true
+	// - name: repo
+	//   in: path
+	//   description: name of the repo
+	//   type: string
+	//   required: true
+	// - name: basehead
+	//   in: path
+	//   description: compare two branches or commits
+	//   type: string
+	//   required: true
+	// responses:
+	//   "200":
+	//     "$ref": "#/responses/Compare"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+
+	if ctx.Repo.GitRepo == nil {
+		gitRepo, err := gitrepo.OpenRepository(ctx, ctx.Repo.Repository)
+		if err != nil {
+			ctx.Error(http.StatusInternalServerError, "OpenRepository", err)
+			return
+		}
+		ctx.Repo.GitRepo = gitRepo
+		defer gitRepo.Close()
+	}
+
+	infoPath := ctx.Params("*")
+	infos := []string{ctx.Repo.Repository.DefaultBranch, ctx.Repo.Repository.DefaultBranch}
+	if infoPath != "" {
+		infos = strings.SplitN(infoPath, "...", 2)
+		if len(infos) != 2 {
+			if infos = strings.SplitN(infoPath, "..", 2); len(infos) != 2 {
+				infos = []string{ctx.Repo.Repository.DefaultBranch, infoPath}
+			}
+		}
+	}
+
+	_, headGitRepo, ci, _, _ := parseCompareInfo(ctx, api.CreatePullRequestOption{
+		Base: infos[0],
+		Head: infos[1],
+	})
+	if ctx.Written() {
+		return
+	}
+	defer headGitRepo.Close()
+
+	verification := ctx.FormString("verification") == "" || ctx.FormBool("verification")
+	files := ctx.FormString("files") == "" || ctx.FormBool("files")
+
+	apiCommits := make([]*api.Commit, 0, len(ci.Commits))
+	userCache := make(map[string]*user_model.User)
+	for i := 0; i < len(ci.Commits); i++ {
+		apiCommit, err := convert.ToCommit(ctx, ctx.Repo.Repository, ctx.Repo.GitRepo, ci.Commits[i], userCache,
+			convert.ToCommitOptions{
+				Stat:         true,
+				Verification: verification,
+				Files:        files,
+			})
+		if err != nil {
+			ctx.ServerError("toCommit", err)
+			return
+		}
+		apiCommits = append(apiCommits, apiCommit)
+	}
+
+	ctx.JSON(http.StatusOK, &api.Compare{
+		TotalCommits: len(ci.Commits),
+		Commits:      apiCommits,
+	})
+}