// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.

package certificates

import (
	"bytes"
	"crypto/tls"
	"crypto/x509"
	"encoding/gob"
	"fmt"
	"net"
	"testing"
	"time"

	"github.com/btcsuite/btcutil/base58"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"github.com/zeebo/errs"
	"go.uber.org/zap"
	"google.golang.org/grpc/credentials"
	"google.golang.org/grpc/peer"

	"storj.io/storj/internal/testcontext"
	"storj.io/storj/internal/testidentity"
	"storj.io/storj/internal/testplanet"
	"storj.io/storj/pkg/identity"
	"storj.io/storj/pkg/pb"
	"storj.io/storj/pkg/peertls/tlsopts"
	"storj.io/storj/pkg/pkcrypto"
	"storj.io/storj/pkg/server"
	"storj.io/storj/pkg/transport"
	"storj.io/storj/pkg/utils"
	"storj.io/storj/storage"
)

var (
	idents = testplanet.NewPregeneratedIdentities()
	t1     = Token{
		UserID: "user@example.com",
		Data:   [tokenDataLength]byte{1, 2, 3},
	}
	t2 = Token{
		UserID: "user2@example.com",
		Data:   [tokenDataLength]byte{4, 5, 6},
	}
)

func TestCertSignerConfig_NewAuthDB(t *testing.T) {
	ctx := testcontext.New(t)
	defer ctx.Cleanup()

	authDB, err := newTestAuthDB(ctx)
	require.NoError(t, err)
	defer ctx.Check(authDB.Close)

	assert.NotNil(t, authDB)
	assert.NotNil(t, authDB.DB)
}

func TestAuthorizationDB_Create(t *testing.T) {
	ctx := testcontext.New(t)
	defer ctx.Cleanup()

	authDB, err := newTestAuthDB(ctx)
	require.NoError(t, err)
	defer ctx.Check(authDB.Close)

	cases := []struct {
		testID,
		email string
		startCount,
		incCount,
		newCount,
		endCount int
		errClass *errs.Class
		err      error
	}{
		{
			"first authorization",
			"user1@example.com",
			0, 1, 1, 1,
			nil, nil,
		},
		{
			"second authorization",
			"user1@example.com",
			1, 2, 2, 3,
			nil, nil,
		},
		{
			"large authorization",
			"user2@example.com",
			0, 5, 5, 5,
			nil, nil,
		},
		{
			"authorization error",
			"user2@example.com",
			5, -1, 0, 5,
			&ErrAuthorizationDB, ErrAuthorizationCount,
		},
	}

	for _, c := range cases {
		t.Run(c.testID, func(t *testing.T) {
			emailKey := storage.Key(c.email)

			if c.startCount == 0 {
				_, err = authDB.DB.Get(emailKey)
				assert.Error(t, err)
			} else {
				v, err := authDB.DB.Get(emailKey)
				assert.NoError(t, err)
				assert.NotEmpty(t, v)

				var existingAuths Authorizations
				err = existingAuths.Unmarshal(v)
				assert.NoError(t, err)
				require.Len(t, existingAuths, c.startCount)
			}

			expectedAuths, err := authDB.Create(c.email, c.incCount)
			if c.errClass != nil {
				assert.True(t, c.errClass.Has(err))
			}
			if c.err != nil {
				assert.Equal(t, c.err, err)
			}
			if c.errClass == nil && c.err == nil {
				assert.NoError(t, err)
			}
			assert.Len(t, expectedAuths, c.newCount)

			v, err := authDB.DB.Get(emailKey)
			assert.NoError(t, err)
			assert.NotEmpty(t, v)

			var actualAuths Authorizations
			err = actualAuths.Unmarshal(v)
			assert.NoError(t, err)
			assert.Len(t, actualAuths, c.endCount)
		})
	}
}

func TestAuthorizationDB_Get(t *testing.T) {
	ctx := testcontext.New(t)
	defer ctx.Cleanup()

	authDB, err := newTestAuthDB(ctx)
	require.NoError(t, err)
	defer ctx.Check(authDB.Close)

	var expectedAuths Authorizations
	for i := 0; i < 5; i++ {
		expectedAuths = append(expectedAuths, &Authorization{
			Token: t1,
		})
	}

	authsBytes, err := expectedAuths.Marshal()
	require.NoError(t, err)

	err = authDB.DB.Put(storage.Key("user@example.com"), authsBytes)
	require.NoError(t, err)

	cases := []struct {
		testID,
		email string
		result Authorizations
	}{
		{
			"Non-existant email",
			"nouser@example.com",
			nil,
		},
		{
			"Exising email",
			"user@example.com",
			expectedAuths,
		},
	}

	for _, c := range cases {
		t.Run(c.testID, func(t *testing.T) {
			auths, err := authDB.Get(c.email)
			assert.NoError(t, err)
			if c.result != nil {
				assert.NotEmpty(t, auths)
				assert.Len(t, auths, len(c.result))
			} else {
				assert.Empty(t, auths)
			}
		})
	}
}

func TestAuthorizationDB_Claim_Valid(t *testing.T) {
	ctx := testcontext.New(t)
	defer ctx.Cleanup()

	authDB, err := newTestAuthDB(ctx)
	require.NoError(t, err)
	defer ctx.Check(authDB.Close)

	userID := "user@example.com"

	auths, err := authDB.Create(userID, 1)
	require.NoError(t, err)
	require.NotEmpty(t, auths)

	ident, err := testidentity.NewTestIdentity(ctx)
	require.NoError(t, err)
	require.NotNil(t, ident)

	addr := &net.TCPAddr{
		IP:   net.ParseIP("1.2.3.4"),
		Port: 5,
	}
	grpcPeer := &peer.Peer{
		Addr: addr,
		AuthInfo: credentials.TLSInfo{
			State: tls.ConnectionState{
				PeerCertificates: []*x509.Certificate{ident.Leaf, ident.CA},
			},
		},
	}

	now := time.Now().Unix()
	req := &pb.SigningRequest{
		AuthToken: auths[0].Token.String(),
		Timestamp: now,
	}
	difficulty, err := ident.ID.Difficulty()
	require.NoError(t, err)

	err = authDB.Claim(&ClaimOpts{
		Req:           req,
		Peer:          grpcPeer,
		ChainBytes:    [][]byte{ident.CA.Raw},
		MinDifficulty: difficulty,
	})
	require.NoError(t, err)

	updatedAuths, err := authDB.Get(userID)
	require.NoError(t, err)
	require.NotEmpty(t, updatedAuths)
	assert.Equal(t, auths[0].Token, updatedAuths[0].Token)

	require.NotNil(t, updatedAuths[0].Claim)

	claim := updatedAuths[0].Claim
	assert.Equal(t, grpcPeer.Addr.String(), claim.Addr)
	assert.Equal(t, [][]byte{ident.CA.Raw}, claim.SignedChainBytes)
	assert.Condition(t, func() bool {
		return now-MaxClaimDelaySeconds < claim.Timestamp &&
			claim.Timestamp < now+MaxClaimDelaySeconds
	})
}

func TestAuthorizationDB_Claim_Invalid(t *testing.T) {
	ctx := testcontext.New(t)
	defer ctx.Cleanup()

	authDB, err := newTestAuthDB(ctx)
	require.NoError(t, err)
	defer ctx.Check(authDB.Close)

	userID := "user@example.com"
	claimedTime := int64(1000000)
	claimedAddr := "6.7.8.9:0"

	ident1, err := testidentity.NewTestIdentity(ctx)
	require.NoError(t, err)
	require.NotNil(t, ident1)

	claimedIdent := &identity.PeerIdentity{
		CA:   ident1.CA,
		Leaf: ident1.Leaf,
	}

	auths, err := authDB.Create(userID, 2)
	require.NoError(t, err)
	require.NotEmpty(t, auths)

	claimedIndex, unclaimedIndex := 0, 1

	auths[claimedIndex].Claim = &Claim{
		Timestamp:        claimedTime,
		Addr:             claimedAddr,
		Identity:         claimedIdent,
		SignedChainBytes: [][]byte{claimedIdent.CA.Raw},
	}
	err = authDB.put(userID, auths)
	require.NoError(t, err)

	ident2, err := testidentity.NewTestIdentity(ctx)
	require.NoError(t, err)
	require.NotNil(t, ident2)

	addr := &net.TCPAddr{
		IP:   net.ParseIP("1.2.3.4"),
		Port: 5,
	}
	grpcPeer := &peer.Peer{
		Addr: addr,
		AuthInfo: credentials.TLSInfo{
			State: tls.ConnectionState{
				PeerCertificates: []*x509.Certificate{ident2.Leaf, ident2.CA},
			},
		},
	}

	difficulty2, err := ident2.ID.Difficulty()
	require.NoError(t, err)

	t.Run("double claim", func(t *testing.T) {
		err = authDB.Claim(&ClaimOpts{
			Req: &pb.SigningRequest{
				AuthToken: auths[claimedIndex].Token.String(),
				Timestamp: time.Now().Unix(),
			},
			Peer:          grpcPeer,
			ChainBytes:    [][]byte{ident2.CA.Raw},
			MinDifficulty: difficulty2,
		})
		if assert.Error(t, err) {
			assert.True(t, ErrAuthorization.Has(err))
			// NB: token string shouldn't leak into error message
			assert.NotContains(t, err.Error(), auths[claimedIndex].Token.String())
		}

		updatedAuths, err := authDB.Get(userID)
		require.NoError(t, err)
		require.NotEmpty(t, updatedAuths)

		assert.Equal(t, auths[claimedIndex].Token, updatedAuths[claimedIndex].Token)

		claim := updatedAuths[claimedIndex].Claim
		assert.Equal(t, claimedAddr, claim.Addr)
		assert.Equal(t, [][]byte{ident1.CA.Raw}, claim.SignedChainBytes)
		assert.Equal(t, claimedTime, claim.Timestamp)
	})

	t.Run("invalid timestamp", func(t *testing.T) {
		err = authDB.Claim(&ClaimOpts{
			Req: &pb.SigningRequest{
				AuthToken: auths[unclaimedIndex].Token.String(),
				// NB: 1 day ago
				Timestamp: time.Now().Unix() - 86400,
			},
			Peer:          grpcPeer,
			ChainBytes:    [][]byte{ident2.CA.Raw},
			MinDifficulty: difficulty2,
		})
		if assert.Error(t, err) {
			assert.True(t, ErrAuthorization.Has(err))
			// NB: token string shouldn't leak into error message
			assert.NotContains(t, err.Error(), auths[unclaimedIndex].Token.String())
		}

		updatedAuths, err := authDB.Get(userID)
		require.NoError(t, err)
		require.NotEmpty(t, updatedAuths)

		assert.Equal(t, auths[unclaimedIndex].Token, updatedAuths[unclaimedIndex].Token)
		assert.Nil(t, updatedAuths[unclaimedIndex].Claim)
	})

	t.Run("invalid difficulty", func(t *testing.T) {
		err = authDB.Claim(&ClaimOpts{
			Req: &pb.SigningRequest{
				AuthToken: auths[unclaimedIndex].Token.String(),
				Timestamp: time.Now().Unix(),
			},
			Peer:          grpcPeer,
			ChainBytes:    [][]byte{ident2.CA.Raw},
			MinDifficulty: difficulty2 + 1,
		})
		if assert.Error(t, err) {
			assert.True(t, ErrAuthorization.Has(err))
			// NB: token string shouldn't leak into error message
			assert.NotContains(t, err.Error(), auths[unclaimedIndex].Token.String())
		}

		updatedAuths, err := authDB.Get(userID)
		require.NoError(t, err)
		require.NotEmpty(t, updatedAuths)

		assert.Equal(t, auths[unclaimedIndex].Token, updatedAuths[unclaimedIndex].Token)
		assert.Nil(t, updatedAuths[unclaimedIndex].Claim)
	})
}

func TestNewAuthorization(t *testing.T) {
	userID := "user@example.com"
	auth, err := NewAuthorization(userID)
	require.NoError(t, err)
	require.NotNil(t, auth)

	assert.NotZero(t, auth.Token)
	assert.Equal(t, userID, auth.Token.UserID)
	assert.NotEmpty(t, auth.Token.Data)
}

func TestAuthorizations_Marshal(t *testing.T) {
	expectedAuths := Authorizations{
		{Token: t1},
		{Token: t2},
	}

	authsBytes, err := expectedAuths.Marshal()
	assert.NoError(t, err)
	assert.NotEmpty(t, authsBytes)

	var actualAuths Authorizations
	decoder := gob.NewDecoder(bytes.NewBuffer(authsBytes))
	err = decoder.Decode(&actualAuths)
	assert.NoError(t, err)
	assert.NotNil(t, actualAuths)
	assert.Equal(t, expectedAuths, actualAuths)
}

func TestAuthorizations_Unmarshal(t *testing.T) {
	expectedAuths := Authorizations{
		{Token: t1},
		{Token: t2},
	}

	authsBytes, err := expectedAuths.Marshal()
	assert.NoError(t, err)
	assert.NotEmpty(t, authsBytes)

	var actualAuths Authorizations
	err = actualAuths.Unmarshal(authsBytes)
	assert.NoError(t, err)
	assert.NotNil(t, actualAuths)
	assert.Equal(t, expectedAuths, actualAuths)
}

func TestAuthorizations_Group(t *testing.T) {
	auths := make(Authorizations, 10)
	for i := 0; i < 10; i++ {
		if i%2 == 0 {
			auths[i] = &Authorization{
				Token: t1,
				Claim: &Claim{
					Timestamp: time.Now().Unix(),
				},
			}
		} else {
			auths[i] = &Authorization{
				Token: t2,
			}
		}
	}

	claimed, open := auths.Group()
	for _, a := range claimed {
		assert.NotNil(t, a.Claim)
	}
	for _, a := range open {
		assert.Nil(t, a.Claim)
	}
}

func TestAuthorizationDB_Emails(t *testing.T) {
	ctx := testcontext.New(t)
	defer ctx.Cleanup()

	authDB, err := newTestAuthDB(ctx)
	require.NoError(t, err)
	defer ctx.Check(authDB.Close)

	var authErrs utils.ErrorGroup
	for i := 0; i < 5; i++ {
		_, err := authDB.Create(fmt.Sprintf("user%d@example.com", i), 1)
		if err != nil {
			authErrs.Add(err)
		}
	}
	err = authErrs.Finish()
	require.NoError(t, err)

	userIDs, err := authDB.UserIDs()
	assert.NoError(t, err)
	assert.NotEmpty(t, userIDs)
}

func TestParseToken_Valid(t *testing.T) {
	userID := "user@example.com"
	data := [tokenDataLength]byte{1, 2, 3}

	cases := []struct {
		testID string
		userID string
	}{
		{
			"valid token",
			userID,
		},
		{
			"multiple delimiters",
			"us" + tokenDelimiter + "er@example.com",
		},
	}

	for _, c := range cases {
		t.Run(c.testID, func(t *testing.T) {
			b58Data := base58.CheckEncode(data[:], tokenVersion)
			tokenString := c.userID + tokenDelimiter + b58Data
			token, err := ParseToken(tokenString)
			require.NoError(t, err)
			require.NotNil(t, token)

			assert.Equal(t, c.userID, token.UserID)
			assert.Equal(t, data[:], token.Data[:])
		})
	}
}

func TestParseToken_Invalid(t *testing.T) {
	userID := "user@example.com"
	data := [tokenDataLength]byte{1, 2, 3}

	cases := []struct {
		testID      string
		tokenString string
	}{
		{
			"no delimiter",
			userID + base58.CheckEncode(data[:], tokenVersion),
		},
		{
			"missing userID",
			tokenDelimiter + base58.CheckEncode(data[:], tokenVersion),
		},
		{
			"not enough data",
			userID + tokenDelimiter + base58.CheckEncode(data[:len(data)-10], tokenVersion),
		},
		{
			"too much data",
			userID + tokenDelimiter + base58.CheckEncode(append(data[:], []byte{0, 0, 0}...), tokenVersion),
		},
		{
			"data checksum/format error",
			userID + tokenDelimiter + base58.CheckEncode(data[:], tokenVersion)[:len(base58.CheckEncode(data[:], tokenVersion))-4] + "0000",
		},
	}

	for _, c := range cases {
		t.Run(c.testID, func(t *testing.T) {
			token, err := ParseToken(c.tokenString)
			assert.Nil(t, token)
			assert.True(t, ErrInvalidToken.Has(err))
		})
	}
}

func TestToken_Equal(t *testing.T) {
	assert.True(t, t1.Equal(&t1))
	assert.False(t, t1.Equal(&t2))
}

// TODO: test sad path
func TestCertificateSigner_Sign_E2E(t *testing.T) {
	ctx := testcontext.New(t)
	defer ctx.Cleanup()

	caCert := ctx.File("ca.cert")
	caKey := ctx.File("ca.key")
	userID := "user@example.com"
	caSetupConfig := identity.CASetupConfig{
		CertPath: caCert,
		KeyPath:  caKey,
	}
	caConfig := identity.FullCAConfig{
		CertPath: caCert,
		KeyPath:  caKey,
	}
	config := CertServerConfig{
		AuthorizationDBURL: "bolt://" + ctx.File("authorizations.db"),
		CA:                 caConfig,
	}
	signingCA, err := caSetupConfig.Create(ctx, nil)
	require.NoError(t, err)

	authDB, err := config.NewAuthDB()
	require.NoError(t, err)

	auths, err := authDB.Create("user@example.com", 1)
	require.NoError(t, err)
	require.NotEmpty(t, auths)

	err = authDB.Close()
	require.NoError(t, err)

	// TODO(bryanchriswhite): figure out why pregenerated
	//  identities change issuers when signed
	//
	//   Issuer: {
	//     Names: null => [],
	//     Organization: null => [],
	//   RawIssue": "MAA=" => "MBAxDjAMBgNVBAoTBVN0b3Jq",
	//------
	//serverIdent, err := idents.NewIdentity()
	//------
	serverCA, err := testidentity.NewTestCA(ctx)
	require.NoError(t, err)
	require.NotNil(t, serverCA)

	serverIdent, err := serverCA.NewIdentity()
	//------
	require.NoError(t, err)
	require.NotNil(t, serverIdent)

	sc := server.Config{Address: "127.0.0.1:0", PrivateAddress: "127.0.0.1:0"}
	opts, err := tlsopts.NewOptions(serverIdent, sc.Config)
	require.NoError(t, err)
	require.NotNil(t, opts)

	service, err := server.New(opts, sc.Address, sc.PrivateAddress, nil, config)
	require.NoError(t, err)
	require.NotNil(t, service)

	ctx.Go(func() error {
		err := service.Run(ctx)
		assert.NoError(t, err)
		return err
	})
	defer func() {
		err := service.Close()
		assert.NoError(t, err)
	}()

	// TODO(bryanchriswhite): figure out why pregenerated
	//  identities change issuers when signed
	//
	//   Issuer: {
	//     Names: null => [],
	//     Organization: null => [],
	//   RawIssue": "MAA=" => "MBAxDjAMBgNVBAoTBVN0b3Jq",
	//------
	//clientIdent, err := idents.NewIdentity()
	//------
	clientCA, err := testidentity.NewTestCA(ctx)
	require.NoError(t, err)
	require.NotNil(t, clientCA)
	clientIdent, err := clientCA.NewIdentity()
	//------
	require.NoError(t, err)
	require.NotNil(t, clientIdent)

	tlsOptions, err := tlsopts.NewOptions(clientIdent, tlsopts.Config{})
	require.NoError(t, err)
	clientTransport := transport.NewClient(tlsOptions)

	client, err := NewClient(ctx, clientTransport, service.Addr().String())
	require.NoError(t, err)
	require.NotNil(t, client)

	signedChainBytes, err := client.Sign(ctx, auths[0].Token.String())
	require.NoError(t, err)
	require.NotEmpty(t, signedChainBytes)

	signedChain, err := pkcrypto.CertsFromDER(signedChainBytes)
	require.NoError(t, err)

	assert.Equal(t, clientIdent.CA.RawTBSCertificate, signedChain[0].RawTBSCertificate)
	assert.Equal(t, signingCA.Cert.Raw, signedChainBytes[1])
	// TODO: test scenario with rest chain
	//assert.Equal(t, signingCA.RawRestChain(), signedChainBytes[1:])

	err = signedChain[0].CheckSignatureFrom(signingCA.Cert)
	assert.NoError(t, err)

	err = service.Close()
	assert.NoError(t, err)

	// NB: re-open after closing for server
	authDB, err = config.NewAuthDB()
	require.NoError(t, err)
	require.NotNil(t, authDB)

	defer ctx.Check(authDB.Close)

	updatedAuths, err := authDB.Get(userID)
	require.NoError(t, err)
	require.NotEmpty(t, updatedAuths)
	require.NotNil(t, updatedAuths[0].Claim)

	now := time.Now().Unix()
	claim := updatedAuths[0].Claim

	listenerHost, _, err := net.SplitHostPort(service.Addr().String())
	require.NoError(t, err)
	claimHost, _, err := net.SplitHostPort(claim.Addr)
	require.NoError(t, err)

	assert.Equal(t, listenerHost, claimHost)
	assert.Equal(t, signedChainBytes, claim.SignedChainBytes)
	assert.Condition(t, func() bool {
		return now-10 < claim.Timestamp &&
			claim.Timestamp < now+10
	})
}

func TestNewClient(t *testing.T) {
	t.Skip("needs proper grpc listener to work")

	ctx := testcontext.New(t)
	defer ctx.Cleanup()

	ident, err := idents.NewIdentity()
	require.NoError(t, err)
	require.NotNil(t, ident)

	listener, err := net.Listen("tcp", "127.0.0.1:0")
	require.NoError(t, err)
	require.NotNil(t, listener)

	defer ctx.Check(listener.Close)
	ctx.Go(func() error {
		for {
			conn, err := listener.Accept()
			if err != nil {
				return nil
			}
			if err := conn.Close(); err != nil {
				return err
			}
		}
	})

	tlsOptions, err := tlsopts.NewOptions(ident, tlsopts.Config{})
	require.NoError(t, err)
	clientTransport := transport.NewClient(tlsOptions)

	t.Run("Basic", func(t *testing.T) {
		client, err := NewClient(ctx, clientTransport, listener.Addr().String())
		assert.NoError(t, err)
		assert.NotNil(t, client)

		defer ctx.Check(client.Close)
	})

	t.Run("ClientFrom", func(t *testing.T) {
		conn, err := clientTransport.DialAddress(ctx, listener.Addr().String())
		require.NoError(t, err)
		require.NotNil(t, conn)

		defer ctx.Check(conn.Close)

		pbClient := pb.NewCertificatesClient(conn)
		require.NotNil(t, pbClient)

		client, err := NewClientFrom(pbClient)
		assert.NoError(t, err)
		assert.NotNil(t, client)

		defer ctx.Check(client.Close)
	})
}

func TestCertificateSigner_Sign(t *testing.T) {
	ctx := testcontext.New(t)
	defer ctx.Cleanup()

	caCert := ctx.File("ca.cert")
	caKey := ctx.File("ca.key")
	userID := "user@example.com"
	caSetupConfig := identity.CASetupConfig{
		CertPath: caCert,
		KeyPath:  caKey,
	}
	config := CertServerConfig{
		AuthorizationDBURL: "bolt://" + ctx.File("authorizations.db"),
	}
	signingCA, err := caSetupConfig.Create(ctx, nil)
	require.NoError(t, err)

	authDB, err := config.NewAuthDB()
	require.NoError(t, err)
	require.NotNil(t, authDB)

	defer ctx.Check(authDB.Close)

	auths, err := authDB.Create(userID, 1)
	require.NoError(t, err)
	require.NotEmpty(t, auths)

	// TODO(bryanchriswhite): figure out why pregenerated
	//  identities change issuers when signed
	//
	//   Issuer: {
	//     Names: null => [],
	//     Organization: null => [],
	//   RawIssue": "MAA=" => "MBAxDjAMBgNVBAoTBVN0b3Jq",
	//------
	//clientIdent, err := idents.NewIdentity()
	//------
	clientCA, err := testidentity.NewTestCA(ctx)
	require.NoError(t, err)
	require.NotNil(t, clientCA)

	clientIdent, err := clientCA.NewIdentity()
	require.NoError(t, err)
	require.NotNil(t, clientIdent)
	//------

	expectedAddr := &net.TCPAddr{
		IP:   net.ParseIP("1.2.3.4"),
		Port: 5,
	}
	grpcPeer := &peer.Peer{
		Addr: expectedAddr,
		AuthInfo: credentials.TLSInfo{
			State: tls.ConnectionState{
				PeerCertificates: []*x509.Certificate{clientIdent.Leaf, clientIdent.CA},
			},
		},
	}
	peerCtx := peer.NewContext(ctx, grpcPeer)

	certSigner := NewServer(zap.L(), signingCA, authDB, 0)
	req := pb.SigningRequest{
		Timestamp: time.Now().Unix(),
		AuthToken: auths[0].Token.String(),
	}
	res, err := certSigner.Sign(peerCtx, &req)
	require.NoError(t, err)
	require.NotNil(t, res)
	require.NotEmpty(t, res.Chain)

	signedChain, err := pkcrypto.CertsFromDER(res.Chain)
	require.NoError(t, err)

	assert.Equal(t, clientIdent.CA.RawTBSCertificate, signedChain[0].RawTBSCertificate)
	assert.Equal(t, signingCA.Cert.Raw, signedChain[1].Raw)
	// TODO: test scenario with rest chain
	//assert.Equal(t, signingCA.RawRestChain(), res.Chain[1:])

	err = signedChain[0].CheckSignatureFrom(signingCA.Cert)
	assert.NoError(t, err)

	updatedAuths, err := authDB.Get(userID)
	require.NoError(t, err)
	require.NotEmpty(t, updatedAuths)
	require.NotNil(t, updatedAuths[0].Claim)

	now := time.Now().Unix()
	claim := updatedAuths[0].Claim
	assert.Equal(t, expectedAddr.String(), claim.Addr)
	assert.Equal(t, res.Chain, claim.SignedChainBytes)
	assert.Condition(t, func() bool {
		return now-MaxClaimDelaySeconds < claim.Timestamp &&
			claim.Timestamp < now+MaxClaimDelaySeconds
	})
}

func newTestAuthDB(ctx *testcontext.Context) (*AuthorizationDB, error) {
	dbPath := "bolt://" + ctx.File("authorizations.db")
	config := CertServerConfig{
		AuthorizationDBURL: dbPath,
	}
	return config.NewAuthDB()
}