Add an api endpoint to fetch git notes (#15373)

Author: nitul1991

Diff for: integrations/api_repo_git_notes_test.go

@@ -0,0 +1,39 @@
+// Copyright 2021 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 integrations
+
+import (
+	"net/http"
+	"net/url"
+	"testing"
+
+	"code.gitea.io/gitea/models"
+	api "code.gitea.io/gitea/modules/structs"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAPIReposGitNotes(t *testing.T) {
+	onGiteaRun(t, func(*testing.T, *url.URL) {
+		user := models.AssertExistsAndLoadBean(t, &models.User{ID: 2}).(*models.User)
+		// Login as User2.
+		session := loginUser(t, user.Name)
+		token := getTokenForLoggedInUser(t, session)
+
+		// check invalid requests
+		req := NewRequestf(t, "GET", "/api/v1/repos/%s/repo1/git/notes/12345?token=%s", user.Name, token)
+		session.MakeRequest(t, req, http.StatusNotFound)
+
+		req = NewRequestf(t, "GET", "/api/v1/repos/%s/repo1/git/notes/..?token=%s", user.Name, token)
+		session.MakeRequest(t, req, http.StatusUnprocessableEntity)
+
+		// check valid request
+		req = NewRequestf(t, "GET", "/api/v1/repos/%s/repo1/git/notes/65f1bf27bc3bf70f64657658635e66094edbcb4d?token=%s", user.Name, token)
+		resp := session.MakeRequest(t, req, http.StatusOK)
+
+		var apiData api.Note
+		DecodeJSON(t, resp, &apiData)
+		assert.Equal(t, "This is a test note\n", apiData.Message)
+	})
+}

Diff for: integrations/gitea-repositories-meta/user2/repo1.git/objects/3f/a2f829675543ecfc16b2891aebe8bf0608a8f4

@@ -0,0 +1 @@
+3fa2f829675543ecfc16b2891aebe8bf0608a8f4

Diff for: integrations/gitea-repositories-meta/user2/repo1.git/objects/d4/a1a6dcf7bd42891f264d484e80dac7e66b5410

@@ -10,19 +10,24 @@ import (
 	"context"
 	"io/ioutil"
 
+	"code.gitea.io/gitea/modules/log"
+
 	"github.com/go-git/go-git/v5/plumbing/object"
 )
 
 // GetNote retrieves the git-notes data for a given commit.
 func GetNote(ctx context.Context, repo *Repository, commitID string, note *Note) error {
+	log.Trace("Searching for git note corresponding to the commit %q in the repository %q", commitID, repo.Path)
 	notes, err := repo.GetCommit(NotesRef)
 	if err != nil {
+		log.Error("Unable to get commit from ref %q. Error: %v", NotesRef, err)
 		return err
 	}
 
 	remainingCommitID := commitID
 	path := ""
 	currentTree := notes.Tree.gogitTree
+	log.Trace("Found tree with ID %q while searching for git note corresponding to the commit %q", currentTree.Entries[0].Name, commitID)
 	var file *object.File
 	for len(remainingCommitID) > 2 {
 		file, err = currentTree.File(remainingCommitID)
@@ -39,19 +44,22 @@ func GetNote(ctx context.Context, repo *Repository, commitID string, note *Note)
 			if err == object.ErrDirectoryNotFound {
 				return ErrNotExist{ID: remainingCommitID, RelPath: path}
 			}
+			log.Error("Unable to find git note corresponding to the commit %q. Error: %v", commitID, err)
 			return err
 		}
 	}
 
 	blob := file.Blob
 	dataRc, err := blob.Reader()
 	if err != nil {
+		log.Error("Unable to read blob with ID %q. Error: %v", blob.ID, err)
 		return err
 	}
 
 	defer dataRc.Close()
 	d, err := ioutil.ReadAll(dataRc)
 	if err != nil {
+		log.Error("Unable to read blob with ID %q. Error: %v", blob.ID, err)
 		return err
 	}
 	note.Message = d
@@ -68,6 +76,7 @@ func GetNote(ctx context.Context, repo *Repository, commitID string, note *Note)
 
 	lastCommits, err := GetLastCommitForPaths(ctx, commitNode, "", []string{path})
 	if err != nil {
+		log.Error("Unable to get the commit for the path %q. Error: %v", path, err)
 		return err
 	}
 	note.Commit = convertCommit(lastCommits[path])

Diff for: integrations/gitea-repositories-meta/user2/repo1.git/objects/d7/bd5b8cfb680f460e37b6fd7cf74c284e059118

@@ -10,20 +10,26 @@ import (
 	"context"
 	"io/ioutil"
 	"strings"
+
+	"code.gitea.io/gitea/modules/log"
 )
 
 // GetNote retrieves the git-notes data for a given commit.
 func GetNote(ctx context.Context, repo *Repository, commitID string, note *Note) error {
+	log.Trace("Searching for git note corresponding to the commit %q in the repository %q", commitID, repo.Path)
 	notes, err := repo.GetCommit(NotesRef)
 	if err != nil {
+		log.Error("Unable to get commit from ref %q. Error: %v", NotesRef, err)
 		return err
 	}
 
 	path := ""
 
 	tree := &notes.Tree
+	log.Trace("Found tree with ID %q while searching for git note corresponding to the commit %q", tree.ID, commitID)
 
 	var entry *TreeEntry
+	originalCommitID := commitID
 	for len(commitID) > 2 {
 		entry, err = tree.GetTreeEntryByPath(commitID)
 		if err == nil {
@@ -36,12 +42,15 @@ func GetNote(ctx context.Context, repo *Repository, commitID string, note *Note)
 			commitID = commitID[2:]
 		}
 		if err != nil {
+			log.Error("Unable to find git note corresponding to the commit %q. Error: %v", originalCommitID, err)
 			return err
 		}
 	}
 
-	dataRc, err := entry.Blob().DataAsync()
+	blob := entry.Blob()
+	dataRc, err := blob.DataAsync()
 	if err != nil {
+		log.Error("Unable to read blob with ID %q. Error: %v", blob.ID, err)
 		return err
 	}
 	closed := false
@@ -52,6 +61,7 @@ func GetNote(ctx context.Context, repo *Repository, commitID string, note *Note)
 	}()
 	d, err := ioutil.ReadAll(dataRc)
 	if err != nil {
+		log.Error("Unable to read blob with ID %q. Error: %v", blob.ID, err)
 		return err
 	}
 	_ = dataRc.Close()
@@ -66,6 +76,7 @@ func GetNote(ctx context.Context, repo *Repository, commitID string, note *Note)
 
 	lastCommits, err := GetLastCommitForPaths(ctx, notes, treePath, []string{path})
 	if err != nil {
+		log.Error("Unable to get the commit for the path %q. Error: %v", treePath, err)
 		return err
 	}
 	note.Commit = lastCommits[path]

Diff for: integrations/gitea-repositories-meta/user2/repo1.git/refs/notes/commits

@@ -0,0 +1,11 @@
+// Copyright 2021 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 structs
+
+// Note contains information related to a git note
+type Note struct {
+	Message string  `json:"message"`
+	Commit  *Commit `json:"commit"`
+}

Diff for: modules/git/notes_gogit.go

@@ -953,6 +953,7 @@ func Routes() *web.Route {
 					m.Get("/trees/{sha}", context.RepoRefForAPI, repo.GetTree)
 					m.Get("/blobs/{sha}", context.RepoRefForAPI, repo.GetBlob)
 					m.Get("/tags/{sha}", context.RepoRefForAPI, repo.GetAnnotatedTag)
+					m.Get("/notes/{sha}", repo.GetNote)
 				}, reqRepoReader(models.UnitTypeCode))
 				m.Group("/contents", func() {
 					m.Get("", repo.GetContentsList)

Diff for: modules/git/notes_nogogit.go

@@ -0,0 +1,82 @@
+// Copyright 2021 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 (
+	"fmt"
+	"net/http"
+
+	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/convert"
+	"code.gitea.io/gitea/modules/git"
+	api "code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/modules/validation"
+)
+
+// GetNote Get a note corresponding to a single commit from a repository
+func GetNote(ctx *context.APIContext) {
+	// swagger:operation GET /repos/{owner}/{repo}/git/notes/{sha} repository repoGetNote
+	// ---
+	// summary: Get a note corresponding to a single commit from a repository
+	// 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: sha
+	//   in: path
+	//   description: a git ref or commit sha
+	//   type: string
+	//   required: true
+	// responses:
+	//   "200":
+	//     "$ref": "#/responses/Note"
+	//   "422":
+	//     "$ref": "#/responses/validationError"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+
+	sha := ctx.Params(":sha")
+	if (validation.GitRefNamePatternInvalid.MatchString(sha) || !validation.CheckGitRefAdditionalRulesValid(sha)) && !git.SHAPattern.MatchString(sha) {
+		ctx.Error(http.StatusUnprocessableEntity, "no valid ref or sha", fmt.Sprintf("no valid ref or sha: %s", sha))
+		return
+	}
+	getNote(ctx, sha)
+}
+
+func getNote(ctx *context.APIContext, identifier string) {
+	gitRepo, err := git.OpenRepository(ctx.Repo.Repository.RepoPath())
+	if err != nil {
+		ctx.Error(http.StatusInternalServerError, "OpenRepository", err)
+		return
+	}
+	defer gitRepo.Close()
+	var note git.Note
+	err = git.GetNote(ctx, gitRepo, identifier, &note)
+	if err != nil {
+		if git.IsErrNotExist(err) {
+			ctx.NotFound(identifier)
+			return
+		}
+		ctx.Error(http.StatusInternalServerError, "GetNote", err)
+		return
+	}
+
+	cmt, err := convert.ToCommit(ctx.Repo.Repository, note.Commit, nil)
+	if err != nil {
+		ctx.Error(http.StatusInternalServerError, "ToCommit", err)
+		return
+	}
+	apiNote := api.Note{Message: string(note.Message), Commit: cmt}
+	ctx.JSON(http.StatusOK, apiNote)
+}

Diff for: modules/structs/repo_note.go

@@ -254,6 +254,13 @@ type swaggerCommitList struct {
 	Body []api.Commit `json:"body"`
 }
 
+// Note
+// swagger:response Note
+type swaggerNote struct {
+	// in: body
+	Body api.Note `json:"body"`
+}
+
 // EmptyRepository
 // swagger:response EmptyRepository
 type swaggerEmptyRepository struct {

Diff for: routers/api/v1/api.go

@@ -3569,6 +3569,52 @@
         }
       }
     },
+    "/repos/{owner}/{repo}/git/notes/{sha}": {
+      "get": {
+        "produces": [
+          "application/json"
+        ],
+        "tags": [
+          "repository"
+        ],
+        "summary": "Get a note corresponding to a single commit from a repository",
+        "operationId": "repoGetNote",
+        "parameters": [
+          {
+            "type": "string",
+            "description": "owner of the repo",
+            "name": "owner",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "string",
+            "description": "name of the repo",
+            "name": "repo",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "string",
+            "description": "a git ref or commit sha",
+            "name": "sha",
+            "in": "path",
+            "required": true
+          }
+        ],
+        "responses": {
+          "200": {
+            "$ref": "#/responses/Note"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
+          },
+          "422": {
+            "$ref": "#/responses/validationError"
+          }
+        }
+      }
+    },
     "/repos/{owner}/{repo}/git/refs": {
       "get": {
         "produces": [
@@ -15453,6 +15499,20 @@
       },
       "x-go-package": "code.gitea.io/gitea/modules/structs"
     },
+    "Note": {
+      "description": "Note contains information related to a git note",
+      "type": "object",
+      "properties": {
+        "commit": {
+          "$ref": "#/definitions/Commit"
+        },
+        "message": {
+          "type": "string",
+          "x-go-name": "Message"
+        }
+      },
+      "x-go-package": "code.gitea.io/gitea/modules/structs"
+    },
     "NotificationCount": {
       "description": "NotificationCount number of unread notifications",
       "type": "object",
@@ -17412,6 +17472,12 @@
         }
       }
     },
+    "Note": {
+      "description": "Note",
+      "schema": {
+        "$ref": "#/definitions/Note"
+      }
+    },
     "NotificationCount": {
       "description": "Number of unread notifications",
       "schema": {