package acl

import (
	"fmt"
	"testing"
	"time"

	"github.com/hashicorp/nomad/api"
	"github.com/hashicorp/nomad/e2e/e2eutil"
	"github.com/hashicorp/nomad/helper/uuid"
	"github.com/stretchr/testify/require"
)

var (
	minTokenExpiryDur = 1 * time.Second
	maxTokenExpiryDur = 24 * time.Hour
)

// testACLTokenExpiration tests tokens that have expiration values set.
// Expirations are timing based which makes this test sensitive to timing
// problems when running the E2E suite.
//
// When running the test, the Nomad server ACL config must have the
// token_min_expiration_ttl value set to minTokenExpiryDur. The
// token_min_expiration_ttl value must be set to maxTokenExpiryDur if this
// value differs from the default. This is so we can test expired tokens,
// without blocking for an extended period of time as well as other time
// related aspects.
func testACLTokenExpiration(t *testing.T) {

	nomadClient := e2eutil.NomadClient(t)

	// Create and defer the Cleanup process. This is used to remove all
	// resources created by this test and covers situations where the test
	// fails or during normal running.
	cleanUpProcess := NewCleanup()
	defer cleanUpProcess.Run(t, nomadClient)

	// Create an ACL policy which will be assigned to the created ACL tokens.
	customNamespacePolicy := api.ACLPolicy{
		Name:        "e2e-acl-" + uuid.Short(),
		Description: "E2E ACL Role Testing",
		Rules:       `namespace "default" {policy = "read"}`,
	}
	_, err := nomadClient.ACLPolicies().Upsert(&customNamespacePolicy, nil)
	require.NoError(t, err)

	cleanUpProcess.Add(customNamespacePolicy.Name, ACLPolicyTestResourceType)

	// Create our default query options which can be used when testing a token
	// against the API. The caller should update the auth token as needed.
	defaultNSQueryMeta := api.QueryOptions{Namespace: "default"}

	// Attempt to create a token with a lower than acceptable TTL and ensure we
	// get an error.
	tokenTTLLow := api.ACLToken{
		Name:          "e2e-acl-" + uuid.Short(),
		Type:          "client",
		Policies:      []string{customNamespacePolicy.Name},
		ExpirationTTL: minTokenExpiryDur / 2,
	}
	aclTokenCreateResp, _, err := nomadClient.ACLTokens().Create(&tokenTTLLow, nil)
	require.ErrorContains(t, err, fmt.Sprintf(
		"expiration time cannot be less than %s in the future", minTokenExpiryDur))
	require.Nil(t, aclTokenCreateResp)

	// Attempt to create a token with a higher than acceptable TTL and ensure
	// we get an error.
	tokenTTLHigh := api.ACLToken{
		Name:          "e2e-acl-" + uuid.Short(),
		Type:          "client",
		Policies:      []string{customNamespacePolicy.Name},
		ExpirationTTL: 8766 * time.Hour,
	}
	aclTokenCreateResp, _, err = nomadClient.ACLTokens().Create(&tokenTTLHigh, nil)
	require.ErrorContains(t, err, fmt.Sprintf(
		"expiration time cannot be more than %s in the future", maxTokenExpiryDur))
	require.Nil(t, aclTokenCreateResp)

	// Create an ACL token that has a fairly standard TTL that will allow us to
	// make successful calls without it expiring.
	tokenNormalExpiry := api.ACLToken{
		Name:          "e2e-acl-" + uuid.Short(),
		Type:          "client",
		Policies:      []string{customNamespacePolicy.Name},
		ExpirationTTL: 10 * time.Minute,
	}
	tokenNormalExpiryCreateResp, _, err := nomadClient.ACLTokens().Create(&tokenNormalExpiry, nil)
	require.NoError(t, err)
	require.NotNil(t, tokenNormalExpiryCreateResp)
	require.Equal(t,
		*tokenNormalExpiryCreateResp.ExpirationTime,
		tokenNormalExpiryCreateResp.CreateTime.Add(tokenNormalExpiryCreateResp.ExpirationTTL))

	cleanUpProcess.Add(tokenNormalExpiryCreateResp.AccessorID, ACLTokenTestResourceType)

	// Add the token to our query options and ensure we can now list jobs with
	// the default namespace.
	defaultNSQueryMeta.AuthToken = tokenNormalExpiryCreateResp.SecretID

	jobListResp, _, err := nomadClient.Jobs().List(&defaultNSQueryMeta)
	require.NoError(t, err)

	// Create an ACL token with the lowest expiry TTL possible, so it will
	// expire almost immediately.
	tokenQuickExpiry := api.ACLToken{
		Name:          "e2e-acl-" + uuid.Short(),
		Type:          "client",
		Policies:      []string{customNamespacePolicy.Name},
		ExpirationTTL: minTokenExpiryDur,
	}
	tokenQuickExpiryCreateResp, _, err := nomadClient.ACLTokens().Create(&tokenQuickExpiry, nil)
	require.NoError(t, err)
	require.NotNil(t, tokenQuickExpiryCreateResp)
	require.Equal(t,
		*tokenQuickExpiryCreateResp.ExpirationTime,
		tokenQuickExpiryCreateResp.CreateTime.Add(tokenQuickExpiryCreateResp.ExpirationTTL))

	cleanUpProcess.Add(tokenQuickExpiryCreateResp.AccessorID, ACLTokenTestResourceType)

	// Block the test (sorry) until the token has expired.
	time.Sleep(tokenQuickExpiry.ExpirationTTL)

	// Update our query options and attempt to list the job using our expired
	// token.
	defaultNSQueryMeta.AuthToken = tokenQuickExpiryCreateResp.SecretID

	jobListResp, _, err = nomadClient.Jobs().List(&defaultNSQueryMeta)
	require.ErrorContains(t, err, "ACL token expired")
	require.Nil(t, jobListResp)

	cleanUpProcess.Remove(tokenQuickExpiryCreateResp.AccessorID, ACLTokenTestResourceType)

	// List the tokens to ensure the output correctly shows the token
	// expiration. Other tests may have left tokens in state, so do not perform
	// a length check.
	tokenListResp, _, err := nomadClient.ACLTokens().List(nil)
	require.NoError(t, err)

	var quickExpiryFound, normalExpiryFound bool

	for _, token := range tokenListResp {
		switch token.AccessorID {
		case tokenQuickExpiryCreateResp.AccessorID:
			quickExpiryFound = true
			require.NotNil(t, token.ExpirationTime)
		case tokenNormalExpiryCreateResp.AccessorID:
			normalExpiryFound = true
			require.NotNil(t, token.ExpirationTime)
		default:
			continue
		}
	}

	require.True(t, quickExpiryFound)
	require.True(t, normalExpiryFound)

	// Ensure we can manually delete unexpired tokens and that they are
	// immediately removed from state.
	_, err = nomadClient.ACLTokens().Delete(tokenNormalExpiryCreateResp.AccessorID, nil)
	require.NoError(t, err)

	tokenNormalExpiryReadResp, _, err := nomadClient.ACLTokens().Info(tokenNormalExpiryCreateResp.AccessorID, nil)
	require.ErrorContains(t, err, "ACL token not found")
	require.Nil(t, tokenNormalExpiryReadResp)

	cleanUpProcess.Remove(tokenNormalExpiryCreateResp.AccessorID, ACLTokenTestResourceType)
}

// testACLTokenRolePolicyAssignment tests that tokens allow and have the
// expected permissions when created or updated with a combination of role and
// policy assignments.
func testACLTokenRolePolicyAssignment(t *testing.T) {

	nomadClient := e2eutil.NomadClient(t)

	// Create and defer the Cleanup process. This is used to remove all
	// resources created by this test and covers situations where the test
	// fails or during normal running.
	cleanUpProcess := NewCleanup()
	defer cleanUpProcess.Run(t, nomadClient)

	// Create two ACL policies which will be used throughout this test. One
	// grants read access to the default namespace, the other grants read
	// access to node objects.
	defaultNamespacePolicy := api.ACLPolicy{
		Name:        "e2e-acl-" + uuid.Short(),
		Description: "E2E ACL Role Testing",
		Rules:       `namespace "default" {policy = "read"}`,
	}
	_, err := nomadClient.ACLPolicies().Upsert(&defaultNamespacePolicy, nil)
	require.NoError(t, err)

	cleanUpProcess.Add(defaultNamespacePolicy.Name, ACLPolicyTestResourceType)

	nodePolicy := api.ACLPolicy{
		Name:        "e2e-acl-" + uuid.Short(),
		Description: "E2E ACL Role Testing",
		Rules:       `node { policy = "read" }`,
	}
	_, err = nomadClient.ACLPolicies().Upsert(&nodePolicy, nil)
	require.NoError(t, err)

	cleanUpProcess.Add(nodePolicy.Name, ACLPolicyTestResourceType)

	// Create an ACL role that has the node read policy assigned.
	aclRole := api.ACLRole{
		Name:        "e2e-acl-" + uuid.Short(),
		Description: "E2E ACL Role Testing",
		Policies:    []*api.ACLRolePolicyLink{{Name: nodePolicy.Name}},
	}
	aclRoleCreateResp, _, err := nomadClient.ACLRoles().Create(&aclRole, nil)
	require.NoError(t, err)
	require.NotNil(t, aclRoleCreateResp)
	require.NotEmpty(t, aclRoleCreateResp.ID)

	cleanUpProcess.Add(aclRoleCreateResp.ID, ACLRoleTestResourceType)

	// Create an ACL token which only has the ACL policy which allows reading
	// the default namespace assigned.
	token := api.ACLToken{
		Name:     "e2e-acl-" + uuid.Short(),
		Type:     "client",
		Policies: []string{defaultNamespacePolicy.Name},
	}
	aclTokenCreateResp, _, err := nomadClient.ACLTokens().Create(&token, nil)
	require.NoError(t, err)
	require.NotNil(t, aclTokenCreateResp)
	require.NotEmpty(t, aclTokenCreateResp.SecretID)

	cleanUpProcess.Add(aclTokenCreateResp.AccessorID, ACLTokenTestResourceType)

	// Test that the token can read the default namespace, but that it cannot
	// read node objects.
	defaultNSQueryMeta := api.QueryOptions{Namespace: "default", AuthToken: aclTokenCreateResp.SecretID}
	jobListResp, _, err := nomadClient.Jobs().List(&defaultNSQueryMeta)
	require.NoError(t, err)

	nodeStubList, _, err := nomadClient.Nodes().List(&defaultNSQueryMeta)
	require.ErrorContains(t, err, "Permission denied")
	require.Nil(t, nodeStubList)

	// Update the token to also include the ACL role which will allow reading
	// node objects.
	newToken := aclTokenCreateResp
	newToken.Roles = []*api.ACLTokenRoleLink{{ID: aclRoleCreateResp.ID}}
	aclTokenUpdateResp, _, err := nomadClient.ACLTokens().Update(newToken, nil)
	require.NoError(t, err)
	require.Equal(t, aclTokenUpdateResp.SecretID, aclTokenCreateResp.SecretID)

	// Test that the token can now read the default namespace and node objects.
	jobListResp, _, err = nomadClient.Jobs().List(&defaultNSQueryMeta)
	require.NoError(t, err)

	nodeStubList, _, err = nomadClient.Nodes().List(&defaultNSQueryMeta)
	require.NoError(t, err)
	require.Greater(t, len(nodeStubList), 0)

	// Remove the policy assignment from the token.
	newToken.Policies = []string{}
	aclTokenUpdateResp, _, err = nomadClient.ACLTokens().Update(newToken, nil)
	require.NoError(t, err)
	require.Equal(t, aclTokenUpdateResp.SecretID, aclTokenCreateResp.SecretID)

	// Test that the token can now only read node objects and not the default
	// namespace.
	jobListResp, _, err = nomadClient.Jobs().List(&defaultNSQueryMeta)
	require.ErrorContains(t, err, "Permission denied")
	require.Nil(t, jobListResp)

	nodeStubList, _, err = nomadClient.Nodes().List(&defaultNSQueryMeta)
	require.NoError(t, err)
	require.Greater(t, len(nodeStubList), 0)

	// Try and remove the role assignment which should result in a validation
	// error as it needs to include either a policy or role linking.
	newToken.Roles = nil
	aclTokenUpdateResp, _, err = nomadClient.ACLTokens().Update(newToken, nil)
	require.ErrorContains(t, err, "client token missing policies or roles")
	require.Nil(t, aclTokenUpdateResp)

	// Create a new token that has both the role and policy linking in place.
	token = api.ACLToken{
		Name:     "e2e-acl-" + uuid.Short(),
		Type:     "client",
		Policies: []string{defaultNamespacePolicy.Name},
		Roles:    []*api.ACLTokenRoleLink{{ID: aclRoleCreateResp.ID}},
	}
	aclTokenCreateResp, _, err = nomadClient.ACLTokens().Create(&token, nil)
	require.NoError(t, err)
	require.NotNil(t, aclTokenCreateResp)
	require.NotEmpty(t, aclTokenCreateResp.SecretID)

	cleanUpProcess.Add(aclTokenCreateResp.AccessorID, ACLTokenTestResourceType)

	// Test that the token is working as expected.
	defaultNSQueryMeta.AuthToken = aclTokenCreateResp.SecretID

	jobListResp, _, err = nomadClient.Jobs().List(&defaultNSQueryMeta)
	require.NoError(t, err)

	nodeStubList, _, err = nomadClient.Nodes().List(&defaultNSQueryMeta)
	require.NoError(t, err)
	require.Greater(t, len(nodeStubList), 0)

	// Now delete both the policy and the role from underneath the token. This
	// differs to the graceful approaches above where the token was modified to
	// remove the assignment.
	_, err = nomadClient.ACLPolicies().Delete(defaultNamespacePolicy.Name, nil)
	require.NoError(t, err)
	cleanUpProcess.Remove(defaultNamespacePolicy.Name, ACLPolicyTestResourceType)

	_, err = nomadClient.ACLRoles().Delete(aclRoleCreateResp.ID, nil)
	require.NoError(t, err)
	cleanUpProcess.Remove(aclRoleCreateResp.ID, ACLRoleTestResourceType)

	// The token now should not have any power here; quite different to
	// Gandalf's power over the spell on King Theoden.
	jobListResp, _, err = nomadClient.Jobs().List(&defaultNSQueryMeta)
	require.ErrorContains(t, err, "Permission denied")
	require.Nil(t, jobListResp)

	nodeStubList, _, err = nomadClient.Nodes().List(&defaultNSQueryMeta)
	require.ErrorContains(t, err, "Permission denied")
	require.Nil(t, nodeStubList)
}