// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
//
// 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 crypto

import (
	"net/http"
	"testing"
)

var s3IsRequestedTests = []struct {
	Header   http.Header
	Expected bool
}{
	{Header: http.Header{"X-Amz-Server-Side-Encryption": []string{"AES256"}}, Expected: true},  // 0
	{Header: http.Header{"X-Amz-Server-Side-Encryption": []string{"AES-256"}}, Expected: true}, // 1
	{Header: http.Header{"X-Amz-Server-Side-Encryption": []string{""}}, Expected: true},        // 2
	{Header: http.Header{"X-Amz-Server-Side-Encryptio": []string{"AES256"}}, Expected: false},  // 3
}

func TestS3IsRequested(t *testing.T) {
	for i, test := range s3IsRequestedTests {
		if got := S3.IsRequested(test.Header); got != test.Expected {
			t.Errorf("Test %d: Wanted %v but got %v", i, test.Expected, got)
		}
	}
}

var s3ParseTests = []struct {
	Header      http.Header
	ExpectedErr error
}{
	{Header: http.Header{"X-Amz-Server-Side-Encryption": []string{"AES256"}}, ExpectedErr: nil},                         // 0
	{Header: http.Header{"X-Amz-Server-Side-Encryption": []string{"AES-256"}}, ExpectedErr: ErrInvalidEncryptionMethod}, // 1
	{Header: http.Header{"X-Amz-Server-Side-Encryption": []string{""}}, ExpectedErr: ErrInvalidEncryptionMethod},        // 2
	{Header: http.Header{"X-Amz-Server-Side-Encryptio": []string{"AES256"}}, ExpectedErr: ErrInvalidEncryptionMethod},   // 3
}

func TestS3Parse(t *testing.T) {
	for i, test := range s3ParseTests {
		if err := S3.Parse(test.Header); err != test.ExpectedErr {
			t.Errorf("Test %d: Wanted '%v' but got '%v'", i, test.ExpectedErr, err)
		}
	}
}

var ssecIsRequestedTests = []struct {
	Header   http.Header
	Expected bool
}{
	{Header: http.Header{}, Expected: false},                                                                                                     // 0
	{Header: http.Header{"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"}}, Expected: true},                                 // 1
	{Header: http.Header{"X-Amz-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="}}, Expected: true}, // 2
	{Header: http.Header{"X-Amz-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="}}, Expected: true},                 // 3
	{
		Header: http.Header{
			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{""},
			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{""},
			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{""},
		},
		Expected: true,
	}, // 4
	{
		Header: http.Header{
			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
		},
		Expected: true,
	}, // 5
	{
		Header: http.Header{
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
		},
		Expected: false,
	}, // 6
}

func TestSSECIsRequested(t *testing.T) {
	for i, test := range ssecIsRequestedTests {
		if got := SSEC.IsRequested(test.Header); got != test.Expected {
			t.Errorf("Test %d: Wanted %v but got %v", i, test.Expected, got)
		}
	}
}

var ssecCopyIsRequestedTests = []struct {
	Header   http.Header
	Expected bool
}{
	{Header: http.Header{}, Expected: false},                                                                                                                 // 0
	{Header: http.Header{"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"}}, Expected: true},                                 // 1
	{Header: http.Header{"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="}}, Expected: true}, // 2
	{Header: http.Header{"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="}}, Expected: true},                 // 3
	{
		Header: http.Header{
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{""},
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{""},
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{""},
		},
		Expected: true,
	}, // 4
	{
		Header: http.Header{
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
		},
		Expected: true,
	}, // 5
	{
		Header: http.Header{
			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
		},
		Expected: false,
	}, // 6
}

func TestSSECopyIsRequested(t *testing.T) {
	for i, test := range ssecCopyIsRequestedTests {
		if got := SSECopy.IsRequested(test.Header); got != test.Expected {
			t.Errorf("Test %d: Wanted %v but got %v", i, test.Expected, got)
		}
	}
}

var ssecParseTests = []struct {
	Header      http.Header
	ExpectedErr error
}{
	{
		Header: http.Header{
			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
		},
		ExpectedErr: nil, // 0
	},
	{
		Header: http.Header{
			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES-256"}, // invalid algorithm
			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
		},
		ExpectedErr: ErrInvalidCustomerAlgorithm, // 1
	},
	{
		Header: http.Header{
			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{""}, // no client key
			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
		},
		ExpectedErr: ErrMissingCustomerKey, // 2
	},
	{
		Header: http.Header{
			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRr.ZXltdXN0cHJvdmlkZWQ="}, // invalid key
			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
		},
		ExpectedErr: ErrInvalidCustomerKey, // 3
	},
	{
		Header: http.Header{
			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{""}, // no key MD5
		},
		ExpectedErr: ErrMissingCustomerKeyMD5, // 4
	},
	{
		Header: http.Header{
			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{"DzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="}, // wrong client key
			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
		},
		ExpectedErr: ErrCustomerKeyMD5Mismatch, // 5
	},
	{
		Header: http.Header{
			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{".7PpPLAK26ONlVUGOWlusfg=="}, // wrong key MD5
		},
		ExpectedErr: ErrCustomerKeyMD5Mismatch, // 6
	},
}

func TestSSECParse(t *testing.T) {
	var zeroKey [32]byte
	for i, test := range ssecParseTests {
		key, err := SSEC.Parse(test.Header)
		if err != test.ExpectedErr {
			t.Errorf("Test %d: want error '%v' but got '%v'", i, test.ExpectedErr, err)
		}

		if err != nil && key != zeroKey {
			t.Errorf("Test %d: parsing failed and client key is not zero key", i)
		}
		if err == nil && key == zeroKey {
			t.Errorf("Test %d: parsed client key is zero key", i)
		}
		if _, ok := test.Header[SSECKey]; ok {
			t.Errorf("Test %d: client key is not removed from HTTP headers after parsing", i)
		}
	}
}

var ssecCopyParseTests = []struct {
	Header      http.Header
	ExpectedErr error
}{
	{
		Header: http.Header{
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
		},
		ExpectedErr: nil, // 0
	},
	{
		Header: http.Header{
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES-256"}, // invalid algorithm
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
		},
		ExpectedErr: ErrInvalidCustomerAlgorithm, // 1
	},
	{
		Header: http.Header{
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{""}, // no client key
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
		},
		ExpectedErr: ErrMissingCustomerKey, // 2
	},
	{
		Header: http.Header{
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRr.ZXltdXN0cHJvdmlkZWQ="}, // invalid key
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
		},
		ExpectedErr: ErrInvalidCustomerKey, // 3
	},
	{
		Header: http.Header{
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{""}, // no key MD5
		},
		ExpectedErr: ErrMissingCustomerKeyMD5, // 4
	},
	{
		Header: http.Header{
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{"DzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="}, // wrong client key
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
		},
		ExpectedErr: ErrCustomerKeyMD5Mismatch, // 5
	},
	{
		Header: http.Header{
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{".7PpPLAK26ONlVUGOWlusfg=="}, // wrong key MD5
		},
		ExpectedErr: ErrCustomerKeyMD5Mismatch, // 6
	},
}

func TestSSECopyParse(t *testing.T) {
	var zeroKey [32]byte
	for i, test := range ssecCopyParseTests {
		key, err := SSECopy.Parse(test.Header)
		if err != test.ExpectedErr {
			t.Errorf("Test %d: want error '%v' but got '%v'", i, test.ExpectedErr, err)
		}

		if err != nil && key != zeroKey {
			t.Errorf("Test %d: parsing failed and client key is not zero key", i)
		}
		if err == nil && key == zeroKey {
			t.Errorf("Test %d: parsed client key is zero key", i)
		}
		if _, ok := test.Header[SSECKey]; ok {
			t.Errorf("Test %d: client key is not removed from HTTP headers after parsing", i)
		}
	}
}