From eab0a26cc07fc675fa01bec1ea0fdd1a0d37c6d3 Mon Sep 17 00:00:00 2001
From: Evgeniy Kulikov <kim@nspcc.ru>
Date: Mon, 16 Mar 2020 18:34:13 +0300
Subject: [PATCH 1/5] [NPE] check that header exists, otherwise return empty
 string

---
 object/service.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/object/service.go b/object/service.go
index b0afc55..e75c9f2 100644
--- a/object/service.go
+++ b/object/service.go
@@ -124,7 +124,12 @@ func (m *GetResponse) NotFull() bool { return checkIsNotFull(m) }
 func (m *PutRequest) NotFull() bool { return checkIsNotFull(m) }
 
 // CID returns container id value from object put request.
-func (m *PutRequest) CID() CID { return m.GetHeader().Object.SystemHeader.CID }
+func (m *PutRequest) CID() CID {
+	if header := m.GetHeader(); header != nil {
+		return header.Object.SystemHeader.CID
+	}
+	return refs.CID{}
+}
 
 // CID returns container id value from object get request.
 func (m *GetRequest) CID() CID { return m.Address.CID }

From ea0703e089f5df26b0b489f4e2335d0e9a2ad3a3 Mon Sep 17 00:00:00 2001
From: Evgeniy Kulikov <kim@nspcc.ru>
Date: Mon, 16 Mar 2020 18:34:56 +0300
Subject: [PATCH 2/5] add tests case to prevent npe

---
 object/service_test.go | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 object/service_test.go

diff --git a/object/service_test.go b/object/service_test.go
new file mode 100644
index 0000000..f06e557
--- /dev/null
+++ b/object/service_test.go
@@ -0,0 +1,28 @@
+package object
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestRequest(t *testing.T) {
+	cases := []Request{
+		&PutRequest{},
+		&GetRequest{},
+		&HeadRequest{},
+		&SearchRequest{},
+		&DeleteRequest{},
+		&GetRangeRequest{},
+		&GetRangeHashRequest{},
+	}
+
+	for i := range cases {
+		v := cases[i]
+
+		t.Run(fmt.Sprintf("%T", v), func(t *testing.T) {
+			require.NotPanics(t, func() { v.CID() })
+		})
+	}
+}

From 164897604764d2f6ac75d2b0e7adc4549643cf54 Mon Sep 17 00:00:00 2001
From: Evgeniy Kulikov <kim@nspcc.ru>
Date: Mon, 16 Mar 2020 18:37:57 +0300
Subject: [PATCH 3/5] drop go 1.11 from tests

---
 .github/workflows/go.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index d846055..77b6a5e 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: [ '1.11.x', '1.12.x', '1.13.x']
+        go: [ '1.12.x', '1.13.x', '1.14.x']
     steps:
 
     - name: Setup go

From 5a63112f5356b4f5de2bc7d59c761dedb26bc15f Mon Sep 17 00:00:00 2001
From: Evgeniy Kulikov <kim@nspcc.ru>
Date: Mon, 16 Mar 2020 18:43:48 +0300
Subject: [PATCH 4/5] ci cache modules

---
 .github/workflows/go.yml | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 77b6a5e..e74d31a 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -1,5 +1,17 @@
 name: Go
-on: [push]
+on:
+  push:
+    branches:
+      - master
+      - develop
+    paths-ignore:
+      - '*.md'
+  pull_request:
+    branches:
+      - master
+      - develop
+    paths-ignore:
+      - '*.md'
 jobs:
 
   test:
@@ -14,9 +26,10 @@ jobs:
       uses: actions/setup-go@v1
       with:
         go-version: ${{ matrix.go }}
+      id: go
 
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v1
+      uses: actions/checkout@v2
 
     - name: Set GOPATH
       # temporary fix
@@ -26,6 +39,13 @@ jobs:
         echo "##[add-path]$(dirname $GITHUB_WORKSPACE)/bin"
       shell: bash
 
+    - uses: actions/cache@v1
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: |
+          ${{ runner.os }}-go-
+
     - name: Get dependencies
       run: | 
         go get -u -v golang.org/x/lint/golint

From f3d0f43eb3107e03d1eaa0f793137f9a6a27a42a Mon Sep 17 00:00:00 2001
From: Evgeniy Kulikov <kim@nspcc.ru>
Date: Mon, 16 Mar 2020 18:58:27 +0300
Subject: [PATCH 5/5] CHANGELOG

---
 CHANGELOG.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index de5255e..f271707 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 # Changelog
 This is the changelog for NeoFS API
 
+## [0.4.2] - 2020-03-16
+
+### Fixed
+- NPE bug with CID method of object.PutRequest
+
 ## [0.4.1] - 2020-03-02
 
 ### Changed
@@ -204,3 +209,4 @@ Initial public release
 [0.3.2]: https://github.com/nspcc-dev/neofs-api/compare/v0.3.1...v0.3.2
 [0.4.0]: https://github.com/nspcc-dev/neofs-api/compare/v0.3.2...v0.4.0
 [0.4.1]: https://github.com/nspcc-dev/neofs-api/compare/v0.4.0...v0.4.1
+[0.4.2]: https://github.com/nspcc-dev/neofs-api/compare/v0.4.1...v0.4.2