/*
Copyright 2020 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package plugin

import (
	"os"
	"reflect"
	"testing"
	"time"

	"github.com/google/go-cmp/cmp"

	"k8s.io/apimachinery/pkg/util/errors"
	utiltesting "k8s.io/client-go/util/testing"

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	kubeletconfig "k8s.io/kubernetes/pkg/kubelet/apis/config"
)

func Test_readCredentialProviderConfigFile(t *testing.T) {
	testcases := []struct {
		name       string
		configData string
		config     *kubeletconfig.CredentialProviderConfig
		expectErr  string
	}{
		{
			name: "config with 1 plugin and 1 image matcher",
			configData: `---
kind: CredentialProviderConfig
apiVersion: kubelet.config.k8s.io/v1alpha1
providers:
  - name: test
    matchImages:
    - "registry.io/foobar"
    defaultCacheDuration: 10m
    apiVersion: credentialprovider.kubelet.k8s.io/v1alpha1
    args:
    - --v=5
    env:
    - name: FOO
      value: BAR`,
			config: &kubeletconfig.CredentialProviderConfig{
				Providers: []kubeletconfig.CredentialProvider{
					{
						Name:                 "test",
						MatchImages:          []string{"registry.io/foobar"},
						DefaultCacheDuration: &metav1.Duration{Duration: 10 * time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1alpha1",
						Args:                 []string{"--v=5"},
						Env: []kubeletconfig.ExecEnvVar{
							{
								Name:  "FOO",
								Value: "BAR",
							},
						},
					},
				},
			},
		},
		{
			name: "config with 1 plugin and a wildcard image match",
			configData: `---
kind: CredentialProviderConfig
apiVersion: kubelet.config.k8s.io/v1alpha1
providers:
  - name: test
    matchImages:
    - "registry.io/*"
    defaultCacheDuration: 10m
    apiVersion: credentialprovider.kubelet.k8s.io/v1alpha1
    args:
    - --v=5
    env:
    - name: FOO
      value: BAR`,
			config: &kubeletconfig.CredentialProviderConfig{
				Providers: []kubeletconfig.CredentialProvider{
					{
						Name:                 "test",
						MatchImages:          []string{"registry.io/*"},
						DefaultCacheDuration: &metav1.Duration{Duration: 10 * time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1alpha1",
						Args:                 []string{"--v=5"},
						Env: []kubeletconfig.ExecEnvVar{
							{
								Name:  "FOO",
								Value: "BAR",
							},
						},
					},
				},
			},
		},
		{
			name: "config with 1 plugin and multiple image matchers",
			configData: `---
kind: CredentialProviderConfig
apiVersion: kubelet.config.k8s.io/v1alpha1
providers:
  - name: test
    matchImages:
    - "registry.io/*"
    - "foobar.registry.io/*"
    defaultCacheDuration: 10m
    apiVersion: credentialprovider.kubelet.k8s.io/v1alpha1
    args:
    - --v=5
    env:
    - name: FOO
      value: BAR`,
			config: &kubeletconfig.CredentialProviderConfig{
				Providers: []kubeletconfig.CredentialProvider{
					{
						Name:                 "test",
						MatchImages:          []string{"registry.io/*", "foobar.registry.io/*"},
						DefaultCacheDuration: &metav1.Duration{Duration: 10 * time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1alpha1",
						Args:                 []string{"--v=5"},
						Env: []kubeletconfig.ExecEnvVar{
							{
								Name:  "FOO",
								Value: "BAR",
							},
						},
					},
				},
			},
		},
		{
			name: "config with multiple providers",
			configData: `---
kind: CredentialProviderConfig
apiVersion: kubelet.config.k8s.io/v1alpha1
providers:
  - name: test1
    matchImages:
    - "registry.io/one"
    defaultCacheDuration: 10m
    apiVersion: credentialprovider.kubelet.k8s.io/v1alpha1
  - name: test2
    matchImages:
    - "registry.io/two"
    defaultCacheDuration: 10m
    apiVersion: credentialprovider.kubelet.k8s.io/v1alpha1
    args:
    - --v=5
    env:
    - name: FOO
      value: BAR`,

			config: &kubeletconfig.CredentialProviderConfig{
				Providers: []kubeletconfig.CredentialProvider{
					{
						Name:                 "test1",
						MatchImages:          []string{"registry.io/one"},
						DefaultCacheDuration: &metav1.Duration{Duration: 10 * time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1alpha1",
					},
					{
						Name:                 "test2",
						MatchImages:          []string{"registry.io/two"},
						DefaultCacheDuration: &metav1.Duration{Duration: 10 * time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1alpha1",
						Args:                 []string{"--v=5"},
						Env: []kubeletconfig.ExecEnvVar{
							{
								Name:  "FOO",
								Value: "BAR",
							},
						},
					},
				},
			},
		},
		{
			name: "v1beta1 config with multiple providers",
			configData: `---
kind: CredentialProviderConfig
apiVersion: kubelet.config.k8s.io/v1beta1
providers:
  - name: test1
    matchImages:
    - "registry.io/one"
    defaultCacheDuration: 10m
    apiVersion: credentialprovider.kubelet.k8s.io/v1beta1
  - name: test2
    matchImages:
    - "registry.io/two"
    defaultCacheDuration: 10m
    apiVersion: credentialprovider.kubelet.k8s.io/v1beta1
    args:
    - --v=5
    env:
    - name: FOO
      value: BAR`,

			config: &kubeletconfig.CredentialProviderConfig{
				Providers: []kubeletconfig.CredentialProvider{
					{
						Name:                 "test1",
						MatchImages:          []string{"registry.io/one"},
						DefaultCacheDuration: &metav1.Duration{Duration: 10 * time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1beta1",
					},
					{
						Name:                 "test2",
						MatchImages:          []string{"registry.io/two"},
						DefaultCacheDuration: &metav1.Duration{Duration: 10 * time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1beta1",
						Args:                 []string{"--v=5"},
						Env: []kubeletconfig.ExecEnvVar{
							{
								Name:  "FOO",
								Value: "BAR",
							},
						},
					},
				},
			},
		},
		{
			name: "v1 config with multiple providers",
			configData: `---
kind: CredentialProviderConfig
apiVersion: kubelet.config.k8s.io/v1
providers:
  - name: test1
    matchImages:
    - "registry.io/one"
    defaultCacheDuration: 10m
    apiVersion: credentialprovider.kubelet.k8s.io/v1
  - name: test2
    matchImages:
    - "registry.io/two"
    defaultCacheDuration: 10m
    apiVersion: credentialprovider.kubelet.k8s.io/v1
    args:
    - --v=5
    env:
    - name: FOO
      value: BAR`,

			config: &kubeletconfig.CredentialProviderConfig{
				Providers: []kubeletconfig.CredentialProvider{
					{
						Name:                 "test1",
						MatchImages:          []string{"registry.io/one"},
						DefaultCacheDuration: &metav1.Duration{Duration: 10 * time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1",
					},
					{
						Name:                 "test2",
						MatchImages:          []string{"registry.io/two"},
						DefaultCacheDuration: &metav1.Duration{Duration: 10 * time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1",
						Args:                 []string{"--v=5"},
						Env: []kubeletconfig.ExecEnvVar{
							{
								Name:  "FOO",
								Value: "BAR",
							},
						},
					},
				},
			},
		},
		{
			name: "config with wrong Kind",
			configData: `---
kind: WrongKind
apiVersion: kubelet.config.k8s.io/v1alpha1
providers:
  - name: test
    matchImages:
    - "registry.io/foobar"
    defaultCacheDuration: 10m
    apiVersion: credentialprovider.kubelet.k8s.io/v1alpha1
    args:
    - --v=5
    env:
    - name: FOO
      value: BAR`,
			config:    nil,
			expectErr: `no kind "WrongKind" is registered for version "kubelet.config.k8s.io/v1alpha1"`,
		},
		{
			name: "config with wrong apiversion",
			configData: `---
kind: CredentialProviderConfig
apiVersion: foobar/v1alpha1
providers:
  - name: test
    matchImages:
    - "registry.io/foobar"
    defaultCacheDuration: 10m
    apiVersion: credentialprovider.kubelet.k8s.io/v1alpha1
    args:
    - --v=5
    env:
    - name: FOO
      value: BAR`,
			config:    nil,
			expectErr: `no kind "CredentialProviderConfig" is registered for version "foobar/v1alpha1`,
		},
		{
			name: "config with invalid typo",
			configData: `---
kind: CredentialProviderConfig
apiVersion: kubelet.config.k8s.io/v1
providers:
  - name: test
    matchImages:
    - "registry.io/foobar"
    defaultCacheDuration: 10m
    unknownField: should not be here # this field should not be here
    apiVersion: credentialprovider.kubelet.k8s.io/v1alpha1
    args:
    - --v=5
    env:
    - name: FOO
      value: BAR`,
			config:    nil,
			expectErr: `strict decoding error: unknown field "providers[0].unknownField"`,
		},
	}

	for _, testcase := range testcases {
		t.Run(testcase.name, func(t *testing.T) {
			file, err := os.CreateTemp("", "config.yaml")
			if err != nil {
				t.Fatal(err)
			}
			defer utiltesting.CloseAndRemove(t, file)

			_, err = file.WriteString(testcase.configData)
			if err != nil {
				t.Fatal(err)
			}

			authConfig, err := readCredentialProviderConfigFile(file.Name())
			if err != nil && len(testcase.expectErr) == 0 {
				t.Fatal(err)
			}

			if err == nil && len(testcase.expectErr) > 0 {
				t.Fatalf("expected error %q but got none", testcase.expectErr)
			}

			if !reflect.DeepEqual(authConfig, testcase.config) {
				t.Logf("actual auth config: %#v", authConfig)
				t.Logf("expected auth config: %#v", testcase.config)
				t.Error("credential provider config did not match")
			}
		})
	}
}

func Test_validateCredentialProviderConfig(t *testing.T) {
	testcases := []struct {
		name                          string
		config                        *kubeletconfig.CredentialProviderConfig
		saTokenForCredentialProviders bool
		expectErr                     string
	}{
		{
			name:      "no providers provided",
			config:    &kubeletconfig.CredentialProviderConfig{},
			expectErr: `providers: Required value: at least 1 item in plugins is required`,
		},
		{
			name: "no matchImages provided",
			config: &kubeletconfig.CredentialProviderConfig{
				Providers: []kubeletconfig.CredentialProvider{
					{
						Name:                 "foobar",
						MatchImages:          []string{},
						DefaultCacheDuration: &metav1.Duration{Duration: time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1alpha1",
					},
				},
			},
			expectErr: `providers.matchImages: Required value: at least 1 item in matchImages is required`,
		},
		{
			name: "no default cache duration provided",
			config: &kubeletconfig.CredentialProviderConfig{
				Providers: []kubeletconfig.CredentialProvider{
					{
						Name:        "foobar",
						MatchImages: []string{"foobar.registry.io"},
						APIVersion:  "credentialprovider.kubelet.k8s.io/v1alpha1",
					},
				},
			},
			expectErr: `providers.defaultCacheDuration: Required value: defaultCacheDuration is required`,
		},
		{
			name: "name contains '/'",
			config: &kubeletconfig.CredentialProviderConfig{
				Providers: []kubeletconfig.CredentialProvider{
					{
						Name:                 "foo/../bar",
						MatchImages:          []string{"foobar.registry.io"},
						DefaultCacheDuration: &metav1.Duration{Duration: time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1alpha1",
					},
				},
			},
			expectErr: `providers.name: Invalid value: "foo/../bar": provider name cannot contain '/'`,
		},
		{
			name: "name is '.'",
			config: &kubeletconfig.CredentialProviderConfig{
				Providers: []kubeletconfig.CredentialProvider{
					{
						Name:                 ".",
						MatchImages:          []string{"foobar.registry.io"},
						DefaultCacheDuration: &metav1.Duration{Duration: time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1alpha1",
					},
				},
			},
			expectErr: `providers.name: Invalid value: ".": provider name cannot be '.'`,
		},
		{
			name: "name is '..'",
			config: &kubeletconfig.CredentialProviderConfig{
				Providers: []kubeletconfig.CredentialProvider{
					{
						Name:                 "..",
						MatchImages:          []string{"foobar.registry.io"},
						DefaultCacheDuration: &metav1.Duration{Duration: time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1alpha1",
					},
				},
			},
			expectErr: `providers.name: Invalid value: "..": provider name cannot be '..'`,
		},
		{
			name: "name contains spaces",
			config: &kubeletconfig.CredentialProviderConfig{
				Providers: []kubeletconfig.CredentialProvider{
					{
						Name:                 "foo bar",
						MatchImages:          []string{"foobar.registry.io"},
						DefaultCacheDuration: &metav1.Duration{Duration: time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1alpha1",
					},
				},
			},
			expectErr: `providers.name: Invalid value: "foo bar": provider name cannot contain spaces`,
		},
		{
			name: "duplicate names",
			config: &kubeletconfig.CredentialProviderConfig{
				Providers: []kubeletconfig.CredentialProvider{
					{
						Name:                 "foobar",
						MatchImages:          []string{"foobar.registry.io"},
						DefaultCacheDuration: &metav1.Duration{Duration: time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1alpha1",
					},
					{
						Name:                 "foobar",
						MatchImages:          []string{"bar.registry.io"},
						DefaultCacheDuration: &metav1.Duration{Duration: time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1alpha1",
					},
				},
			},
			expectErr: `providers.name: Duplicate value: "foobar"`,
		},
		{
			name: "no apiVersion",
			config: &kubeletconfig.CredentialProviderConfig{
				Providers: []kubeletconfig.CredentialProvider{
					{
						Name:                 "foobar",
						MatchImages:          []string{"foobar.registry.io"},
						DefaultCacheDuration: &metav1.Duration{Duration: time.Minute},
						APIVersion:           "",
					},
				},
			},
			expectErr: "providers.apiVersion: Required value: apiVersion is required",
		},
		{
			name: "invalid apiVersion",
			config: &kubeletconfig.CredentialProviderConfig{
				Providers: []kubeletconfig.CredentialProvider{
					{
						Name:                 "foobar",
						MatchImages:          []string{"foobar.registry.io"},
						DefaultCacheDuration: &metav1.Duration{Duration: time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1alpha0",
					},
				},
			},
			expectErr: `providers.apiVersion: Unsupported value: "credentialprovider.kubelet.k8s.io/v1alpha0": supported values: "credentialprovider.kubelet.k8s.io/v1", "credentialprovider.kubelet.k8s.io/v1alpha1", "credentialprovider.kubelet.k8s.io/v1beta1"`,
		},
		{
			name: "negative default cache duration",
			config: &kubeletconfig.CredentialProviderConfig{
				Providers: []kubeletconfig.CredentialProvider{
					{
						Name:                 "foobar",
						MatchImages:          []string{"foobar.registry.io"},
						DefaultCacheDuration: &metav1.Duration{Duration: -1 * time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1alpha1",
					},
				},
			},
			expectErr: "providers.defaultCacheDuration: Invalid value: -1m0s: defaultCacheDuration must be greater than or equal to 0",
		},
		{
			name: "invalid match image",
			config: &kubeletconfig.CredentialProviderConfig{
				Providers: []kubeletconfig.CredentialProvider{
					{
						Name:                 "foobar",
						MatchImages:          []string{"%invalid%"},
						DefaultCacheDuration: &metav1.Duration{Duration: time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1alpha1",
					},
				},
			},
			expectErr: `providers.matchImages: Invalid value: "%invalid%": match image is invalid: parse "https://%invalid%": invalid URL escape "%in"`,
		},
		{
			name: "valid config",
			config: &kubeletconfig.CredentialProviderConfig{
				Providers: []kubeletconfig.CredentialProvider{
					{
						Name:                 "foobar",
						MatchImages:          []string{"foobar.registry.io"},
						DefaultCacheDuration: &metav1.Duration{Duration: time.Minute},
						APIVersion:           "credentialprovider.kubelet.k8s.io/v1alpha1",
					},
				},
			},
		},
	}

	for _, testcase := range testcases {
		t.Run(testcase.name, func(t *testing.T) {
			errs := validateCredentialProviderConfig(testcase.config).ToAggregate()
			if d := cmp.Diff(testcase.expectErr, errString(errs)); d != "" {
				t.Fatalf("CredentialProviderConfig validation mismatch (-want +got):\n%s", d)
			}
		})
	}
}

func errString(errs errors.Aggregate) string {
	if errs != nil {
		return errs.Error()
	}
	return ""
}