feat(tools): branch_list

internal/gitea/files.go

@@ -92,6 +92,28 @@ type FileWriteResult struct {
 	} `json:"commit"`
 }
 
+func (c *Client) ListBranches(ctx context.Context, owner, repo string, page, limit int) ([]Branch, error) {
+	if page < 1 {
+		page = 1
+	}
+	if limit < 1 {
+		limit = 30
+	}
+	p := fmt.Sprintf("/api/v1/repos/%s/%s/branches?page=%d&limit=%d", owner, repo, page, limit)
+	body, status, err := c.GetJSON(ctx, p)
+	if err != nil {
+		return nil, err
+	}
+	if err := MapStatus(status, body); err != nil {
+		return nil, err
+	}
+	var branches []Branch
+	if err := json.Unmarshal(body, &branches); err != nil {
+		return nil, err
+	}
+	return branches, nil
+}
+
 // UpsertFile creates a file when args.Sha is empty (POST) or updates an existing
 // file when args.Sha is set (PUT). Gitea routes both operations by HTTP method on
 // the same /contents/{path} URL, and rejects PUT without a sha.

internal/gitea/files_test.go

@@ -82,6 +82,28 @@ func TestCreateBranchSendsPayload(t *testing.T) {
 	assert.Equal(t, "main", payload["old_branch_name"])
 }
 
+func TestListBranches(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		assert.Equal(t, "/api/v1/repos/o/r/branches", r.URL.Path)
+		assert.Equal(t, "1", r.URL.Query().Get("page"))
+		assert.Equal(t, "30", r.URL.Query().Get("limit"))
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write([]byte(`[
+			{"name":"main","commit":{"id":"abc","url":"http://example.com"}},
+			{"name":"feat/x","commit":{"id":"def","url":"http://example.com"}}
+		]`))
+	}))
+	defer srv.Close()
+
+	c := gitea.NewClient(srv.URL, "tok")
+	branches, err := c.ListBranches(context.Background(), "o", "r", 0, 0)
+	require.NoError(t, err)
+	require.Len(t, branches, 2)
+	assert.Equal(t, "main", branches[0].Name)
+	assert.Equal(t, "abc", branches[0].Commit.ID)
+	assert.Equal(t, "feat/x", branches[1].Name)
+}
+
 func TestUpsertFileSendsPayloadAndDecodesResult(t *testing.T) {
 	var captured []byte
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {

internal/tools/branch_list.go

@@ -0,0 +1,67 @@
+package tools
+
+import (
+	"context"
+	"encoding/json"
+
+	"gitea.d-ma.be/mathias/gitea-mcp/internal/allowlist"
+	"gitea.d-ma.be/mathias/gitea-mcp/internal/gitea"
+	"gitea.d-ma.be/mathias/gitea-mcp/internal/registry"
+)
+
+type BranchList struct {
+	c *gitea.Client
+	a *allowlist.Allowlist
+}
+
+func NewBranchList(c *gitea.Client, a *allowlist.Allowlist) *BranchList {
+	return &BranchList{c: c, a: a}
+}
+
+func (t *BranchList) Descriptor() registry.ToolDescriptor {
+	return registry.ToolDescriptor{
+		Name:        "branch_list",
+		Description: "List branches in a repository.",
+		InputSchema: json.RawMessage(`{
+			"type":"object",
+			"properties":{
+				"owner":{"type":"string"},
+				"name":{"type":"string"},
+				"page":{"type":"integer"},
+				"limit":{"type":"integer"}
+			},
+			"required":["owner","name"]
+		}`),
+	}
+}
+
+type branchListArgs struct {
+	Owner string `json:"owner"`
+	Name  string `json:"name"`
+	Page  int    `json:"page"`
+	Limit int    `json:"limit"`
+}
+
+func (t *BranchList) Call(ctx context.Context, raw json.RawMessage) (json.RawMessage, error) {
+	var args branchListArgs
+	if err := parseArgs(raw, &args); err != nil {
+		return nil, err
+	}
+	if err := t.a.Check(args.Owner); err != nil {
+		return nil, err
+	}
+
+	branches, err := t.c.ListBranches(ctx, args.Owner, args.Name, args.Page, capLimit(args.Limit, 30))
+	if err != nil {
+		return nil, err
+	}
+
+	result := make([]map[string]any, len(branches))
+	for i, b := range branches {
+		result[i] = map[string]any{
+			"name": b.Name,
+			"sha":  b.Commit.ID,
+		}
+	}
+	return textOK(result)
+}

internal/tools/branch_list_test.go

@@ -0,0 +1,43 @@
+package tools_test
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"gitea.d-ma.be/mathias/gitea-mcp/internal/allowlist"
+	"gitea.d-ma.be/mathias/gitea-mcp/internal/gitea"
+	"gitea.d-ma.be/mathias/gitea-mcp/internal/tools"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestBranchListReturnsNames(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write([]byte(`[
+			{"name":"main","commit":{"id":"abc","url":""}},
+			{"name":"feat/x","commit":{"id":"def","url":""}}
+		]`))
+	}))
+	defer srv.Close()
+
+	tool := tools.NewBranchList(gitea.NewClient(srv.URL, "tok"), allowlist.New([]string{"owner"}))
+	out, err := tool.Call(context.Background(), json.RawMessage(`{"owner":"owner","name":"repo"}`))
+	require.NoError(t, err)
+
+	var result []map[string]any
+	require.NoError(t, json.Unmarshal(out, &result))
+	require.Len(t, result, 2)
+	assert.Equal(t, "main", result[0]["name"])
+	assert.Equal(t, "abc", result[0]["sha"])
+	assert.Equal(t, "feat/x", result[1]["name"])
+}
+
+func TestBranchListAllowlistRejects(t *testing.T) {
+	tool := tools.NewBranchList(gitea.NewClient("http://unused", ""), allowlist.New([]string{"allowed"}))
+	_, err := tool.Call(context.Background(), json.RawMessage(`{"owner":"evil","name":"repo"}`))
+	require.Error(t, err)
+}