iam_credentials_client.go

// Copyright 2023 Google LLC
//
// 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
//
//     https://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.

// Code generated by protoc-gen-go_gapic. DO NOT EDIT.

package credentials

import (
	"bytes"
	"context"
	"fmt"
	"io"
	"math"
	"net/http"
	"net/url"
	"time"

	credentialspb "cloud.google.com/go/iam/credentials/apiv1/credentialspb"
	gax "github.com/googleapis/gax-go/v2"
	"google.golang.org/api/googleapi"
	"google.golang.org/api/option"
	"google.golang.org/api/option/internaloption"
	gtransport "google.golang.org/api/transport/grpc"
	httptransport "google.golang.org/api/transport/http"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/protobuf/encoding/protojson"
)

var newIamCredentialsClientHook clientHook

// IamCredentialsCallOptions contains the retry settings for each method of IamCredentialsClient.
type IamCredentialsCallOptions struct {
	GenerateAccessToken []gax.CallOption
	GenerateIdToken     []gax.CallOption
	SignBlob            []gax.CallOption
	SignJwt             []gax.CallOption
}

func defaultIamCredentialsGRPCClientOptions() []option.ClientOption {
	return []option.ClientOption{
		internaloption.WithDefaultEndpoint("iamcredentials.googleapis.com:443"),
		internaloption.WithDefaultMTLSEndpoint("iamcredentials.mtls.googleapis.com:443"),
		internaloption.WithDefaultAudience("https://iamcredentials.googleapis.com/"),
		internaloption.WithDefaultScopes(DefaultAuthScopes()...),
		internaloption.EnableJwtWithScope(),
		option.WithGRPCDialOption(grpc.WithDefaultCallOptions(
			grpc.MaxCallRecvMsgSize(math.MaxInt32))),
	}
}

func defaultIamCredentialsCallOptions() *IamCredentialsCallOptions {
	return &IamCredentialsCallOptions{
		GenerateAccessToken: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
					codes.DeadlineExceeded,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		GenerateIdToken: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
					codes.DeadlineExceeded,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		SignBlob: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
					codes.DeadlineExceeded,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		SignJwt: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
					codes.DeadlineExceeded,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
	}
}

func defaultIamCredentialsRESTCallOptions() *IamCredentialsCallOptions {
	return &IamCredentialsCallOptions{
		GenerateAccessToken: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				},
					http.StatusServiceUnavailable,
					http.StatusGatewayTimeout)
			}),
		},
		GenerateIdToken: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				},
					http.StatusServiceUnavailable,
					http.StatusGatewayTimeout)
			}),
		},
		SignBlob: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				},
					http.StatusServiceUnavailable,
					http.StatusGatewayTimeout)
			}),
		},
		SignJwt: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				},
					http.StatusServiceUnavailable,
					http.StatusGatewayTimeout)
			}),
		},
	}
}

// internalIamCredentialsClient is an interface that defines the methods available from IAM Service Account Credentials API.
type internalIamCredentialsClient interface {
	Close() error
	setGoogleClientInfo(...string)
	Connection() *grpc.ClientConn
	GenerateAccessToken(context.Context, *credentialspb.GenerateAccessTokenRequest, ...gax.CallOption) (*credentialspb.GenerateAccessTokenResponse, error)
	GenerateIdToken(context.Context, *credentialspb.GenerateIdTokenRequest, ...gax.CallOption) (*credentialspb.GenerateIdTokenResponse, error)
	SignBlob(context.Context, *credentialspb.SignBlobRequest, ...gax.CallOption) (*credentialspb.SignBlobResponse, error)
	SignJwt(context.Context, *credentialspb.SignJwtRequest, ...gax.CallOption) (*credentialspb.SignJwtResponse, error)
}

// IamCredentialsClient is a client for interacting with IAM Service Account Credentials API.
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
//
// A service account is a special type of Google account that belongs to your
// application or a virtual machine (VM), instead of to an individual end user.
// Your application assumes the identity of the service account to call Google
// APIs, so that the users aren’t directly involved.
//
// Service account credentials are used to temporarily assume the identity
// of the service account. Supported credential types include OAuth 2.0 access
// tokens, OpenID Connect ID tokens, self-signed JSON Web Tokens (JWTs), and
// more.
type IamCredentialsClient struct {
	// The internal transport-dependent client.
	internalClient internalIamCredentialsClient

	// The call options for this service.
	CallOptions *IamCredentialsCallOptions
}

// Wrapper methods routed to the internal client.

// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *IamCredentialsClient) Close() error {
	return c.internalClient.Close()
}

// setGoogleClientInfo sets the name and version of the application in
// the `x-goog-api-client` header passed on each request. Intended for
// use by Google-written clients.
func (c *IamCredentialsClient) setGoogleClientInfo(keyval ...string) {
	c.internalClient.setGoogleClientInfo(keyval...)
}

// Connection returns a connection to the API service.
//
// Deprecated: Connections are now pooled so this method does not always
// return the same resource.
func (c *IamCredentialsClient) Connection() *grpc.ClientConn {
	return c.internalClient.Connection()
}

// GenerateAccessToken generates an OAuth 2.0 access token for a service account.
func (c *IamCredentialsClient) GenerateAccessToken(ctx context.Context, req *credentialspb.GenerateAccessTokenRequest, opts ...gax.CallOption) (*credentialspb.GenerateAccessTokenResponse, error) {
	return c.internalClient.GenerateAccessToken(ctx, req, opts...)
}

// GenerateIdToken generates an OpenID Connect ID token for a service account.
func (c *IamCredentialsClient) GenerateIdToken(ctx context.Context, req *credentialspb.GenerateIdTokenRequest, opts ...gax.CallOption) (*credentialspb.GenerateIdTokenResponse, error) {
	return c.internalClient.GenerateIdToken(ctx, req, opts...)
}

// SignBlob signs a blob using a service account’s system-managed private key.
func (c *IamCredentialsClient) SignBlob(ctx context.Context, req *credentialspb.SignBlobRequest, opts ...gax.CallOption) (*credentialspb.SignBlobResponse, error) {
	return c.internalClient.SignBlob(ctx, req, opts...)
}

// SignJwt signs a JWT using a service account’s system-managed private key.
func (c *IamCredentialsClient) SignJwt(ctx context.Context, req *credentialspb.SignJwtRequest, opts ...gax.CallOption) (*credentialspb.SignJwtResponse, error) {
	return c.internalClient.SignJwt(ctx, req, opts...)
}

// iamCredentialsGRPCClient is a client for interacting with IAM Service Account Credentials API over gRPC transport.
//
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
type iamCredentialsGRPCClient struct {
	// Connection pool of gRPC connections to the service.
	connPool gtransport.ConnPool

	// Points back to the CallOptions field of the containing IamCredentialsClient
	CallOptions **IamCredentialsCallOptions

	// The gRPC API client.
	iamCredentialsClient credentialspb.IAMCredentialsClient

	// The x-goog-* metadata to be sent with each request.
	xGoogHeaders []string
}

// NewIamCredentialsClient creates a new iam credentials client based on gRPC.
// The returned client must be Closed when it is done being used to clean up its underlying connections.
//
// A service account is a special type of Google account that belongs to your
// application or a virtual machine (VM), instead of to an individual end user.
// Your application assumes the identity of the service account to call Google
// APIs, so that the users aren’t directly involved.
//
// Service account credentials are used to temporarily assume the identity
// of the service account. Supported credential types include OAuth 2.0 access
// tokens, OpenID Connect ID tokens, self-signed JSON Web Tokens (JWTs), and
// more.
func NewIamCredentialsClient(ctx context.Context, opts ...option.ClientOption) (*IamCredentialsClient, error) {
	clientOpts := defaultIamCredentialsGRPCClientOptions()
	if newIamCredentialsClientHook != nil {
		hookOpts, err := newIamCredentialsClientHook(ctx, clientHookParams{})
		if err != nil {
			return nil, err
		}
		clientOpts = append(clientOpts, hookOpts...)
	}

	connPool, err := gtransport.DialPool(ctx, append(clientOpts, opts...)...)
	if err != nil {
		return nil, err
	}
	client := IamCredentialsClient{CallOptions: defaultIamCredentialsCallOptions()}

	c := &iamCredentialsGRPCClient{
		connPool:             connPool,
		iamCredentialsClient: credentialspb.NewIAMCredentialsClient(connPool),
		CallOptions:          &client.CallOptions,
	}
	c.setGoogleClientInfo()

	client.internalClient = c

	return &client, nil
}

// Connection returns a connection to the API service.
//
// Deprecated: Connections are now pooled so this method does not always
// return the same resource.
func (c *iamCredentialsGRPCClient) Connection() *grpc.ClientConn {
	return c.connPool.Conn()
}

// setGoogleClientInfo sets the name and version of the application in
// the `x-goog-api-client` header passed on each request. Intended for
// use by Google-written clients.
func (c *iamCredentialsGRPCClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", gax.GoVersion}, keyval...)
	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "grpc", grpc.Version)
	c.xGoogHeaders = []string{"x-goog-api-client", gax.XGoogHeader(kv...)}
}

// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *iamCredentialsGRPCClient) Close() error {
	return c.connPool.Close()
}

// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
type iamCredentialsRESTClient struct {
	// The http endpoint to connect to.
	endpoint string

	// The http client.
	httpClient *http.Client

	// The x-goog-* headers to be sent with each request.
	xGoogHeaders []string

	// Points back to the CallOptions field of the containing IamCredentialsClient
	CallOptions **IamCredentialsCallOptions
}

// NewIamCredentialsRESTClient creates a new iam credentials rest client.
//
// A service account is a special type of Google account that belongs to your
// application or a virtual machine (VM), instead of to an individual end user.
// Your application assumes the identity of the service account to call Google
// APIs, so that the users aren’t directly involved.
//
// Service account credentials are used to temporarily assume the identity
// of the service account. Supported credential types include OAuth 2.0 access
// tokens, OpenID Connect ID tokens, self-signed JSON Web Tokens (JWTs), and
// more.
func NewIamCredentialsRESTClient(ctx context.Context, opts ...option.ClientOption) (*IamCredentialsClient, error) {
	clientOpts := append(defaultIamCredentialsRESTClientOptions(), opts...)
	httpClient, endpoint, err := httptransport.NewClient(ctx, clientOpts...)
	if err != nil {
		return nil, err
	}

	callOpts := defaultIamCredentialsRESTCallOptions()
	c := &iamCredentialsRESTClient{
		endpoint:    endpoint,
		httpClient:  httpClient,
		CallOptions: &callOpts,
	}
	c.setGoogleClientInfo()

	return &IamCredentialsClient{internalClient: c, CallOptions: callOpts}, nil
}

func defaultIamCredentialsRESTClientOptions() []option.ClientOption {
	return []option.ClientOption{
		internaloption.WithDefaultEndpoint("https://iamcredentials.googleapis.com"),
		internaloption.WithDefaultMTLSEndpoint("https://iamcredentials.mtls.googleapis.com"),
		internaloption.WithDefaultAudience("https://iamcredentials.googleapis.com/"),
		internaloption.WithDefaultScopes(DefaultAuthScopes()...),
	}
}

// setGoogleClientInfo sets the name and version of the application in
// the `x-goog-api-client` header passed on each request. Intended for
// use by Google-written clients.
func (c *iamCredentialsRESTClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", gax.GoVersion}, keyval...)
	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "rest", "UNKNOWN")
	c.xGoogHeaders = []string{"x-goog-api-client", gax.XGoogHeader(kv...)}
}

// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *iamCredentialsRESTClient) Close() error {
	// Replace httpClient with nil to force cleanup.
	c.httpClient = nil
	return nil
}

// Connection returns a connection to the API service.
//
// Deprecated: This method always returns nil.
func (c *iamCredentialsRESTClient) Connection() *grpc.ClientConn {
	return nil
}
func (c *iamCredentialsGRPCClient) GenerateAccessToken(ctx context.Context, req *credentialspb.GenerateAccessTokenRequest, opts ...gax.CallOption) (*credentialspb.GenerateAccessTokenResponse, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).GenerateAccessToken[0:len((*c.CallOptions).GenerateAccessToken):len((*c.CallOptions).GenerateAccessToken)], opts...)
	var resp *credentialspb.GenerateAccessTokenResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamCredentialsClient.GenerateAccessToken(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *iamCredentialsGRPCClient) GenerateIdToken(ctx context.Context, req *credentialspb.GenerateIdTokenRequest, opts ...gax.CallOption) (*credentialspb.GenerateIdTokenResponse, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).GenerateIdToken[0:len((*c.CallOptions).GenerateIdToken):len((*c.CallOptions).GenerateIdToken)], opts...)
	var resp *credentialspb.GenerateIdTokenResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamCredentialsClient.GenerateIdToken(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *iamCredentialsGRPCClient) SignBlob(ctx context.Context, req *credentialspb.SignBlobRequest, opts ...gax.CallOption) (*credentialspb.SignBlobResponse, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).SignBlob[0:len((*c.CallOptions).SignBlob):len((*c.CallOptions).SignBlob)], opts...)
	var resp *credentialspb.SignBlobResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamCredentialsClient.SignBlob(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *iamCredentialsGRPCClient) SignJwt(ctx context.Context, req *credentialspb.SignJwtRequest, opts ...gax.CallOption) (*credentialspb.SignJwtResponse, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).SignJwt[0:len((*c.CallOptions).SignJwt):len((*c.CallOptions).SignJwt)], opts...)
	var resp *credentialspb.SignJwtResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamCredentialsClient.SignJwt(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// GenerateAccessToken generates an OAuth 2.0 access token for a service account.
func (c *iamCredentialsRESTClient) GenerateAccessToken(ctx context.Context, req *credentialspb.GenerateAccessTokenRequest, opts ...gax.CallOption) (*credentialspb.GenerateAccessTokenResponse, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	jsonReq, err := m.Marshal(req)
	if err != nil {
		return nil, err
	}

	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v1/%v:generateAccessToken", req.GetName())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	opts = append((*c.CallOptions).GenerateAccessToken[0:len((*c.CallOptions).GenerateAccessToken):len((*c.CallOptions).GenerateAccessToken)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &credentialspb.GenerateAccessTokenResponse{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("POST", baseUrl.String(), bytes.NewReader(jsonReq))
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		httpRsp, err := c.httpClient.Do(httpReq)
		if err != nil {
			return err
		}
		defer httpRsp.Body.Close()

		if err = googleapi.CheckResponse(httpRsp); err != nil {
			return err
		}

		buf, err := io.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

		if err := unm.Unmarshal(buf, resp); err != nil {
			return err
		}

		return nil
	}, opts...)
	if e != nil {
		return nil, e
	}
	return resp, nil
}

// GenerateIdToken generates an OpenID Connect ID token for a service account.
func (c *iamCredentialsRESTClient) GenerateIdToken(ctx context.Context, req *credentialspb.GenerateIdTokenRequest, opts ...gax.CallOption) (*credentialspb.GenerateIdTokenResponse, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	jsonReq, err := m.Marshal(req)
	if err != nil {
		return nil, err
	}

	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v1/%v:generateIdToken", req.GetName())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	opts = append((*c.CallOptions).GenerateIdToken[0:len((*c.CallOptions).GenerateIdToken):len((*c.CallOptions).GenerateIdToken)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &credentialspb.GenerateIdTokenResponse{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("POST", baseUrl.String(), bytes.NewReader(jsonReq))
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		httpRsp, err := c.httpClient.Do(httpReq)
		if err != nil {
			return err
		}
		defer httpRsp.Body.Close()

		if err = googleapi.CheckResponse(httpRsp); err != nil {
			return err
		}

		buf, err := io.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

		if err := unm.Unmarshal(buf, resp); err != nil {
			return err
		}

		return nil
	}, opts...)
	if e != nil {
		return nil, e
	}
	return resp, nil
}

// SignBlob signs a blob using a service account’s system-managed private key.
func (c *iamCredentialsRESTClient) SignBlob(ctx context.Context, req *credentialspb.SignBlobRequest, opts ...gax.CallOption) (*credentialspb.SignBlobResponse, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	jsonReq, err := m.Marshal(req)
	if err != nil {
		return nil, err
	}

	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v1/%v:signBlob", req.GetName())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	opts = append((*c.CallOptions).SignBlob[0:len((*c.CallOptions).SignBlob):len((*c.CallOptions).SignBlob)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &credentialspb.SignBlobResponse{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("POST", baseUrl.String(), bytes.NewReader(jsonReq))
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		httpRsp, err := c.httpClient.Do(httpReq)
		if err != nil {
			return err
		}
		defer httpRsp.Body.Close()

		if err = googleapi.CheckResponse(httpRsp); err != nil {
			return err
		}

		buf, err := io.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

		if err := unm.Unmarshal(buf, resp); err != nil {
			return err
		}

		return nil
	}, opts...)
	if e != nil {
		return nil, e
	}
	return resp, nil
}

// SignJwt signs a JWT using a service account’s system-managed private key.
func (c *iamCredentialsRESTClient) SignJwt(ctx context.Context, req *credentialspb.SignJwtRequest, opts ...gax.CallOption) (*credentialspb.SignJwtResponse, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	jsonReq, err := m.Marshal(req)
	if err != nil {
		return nil, err
	}

	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v1/%v:signJwt", req.GetName())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	opts = append((*c.CallOptions).SignJwt[0:len((*c.CallOptions).SignJwt):len((*c.CallOptions).SignJwt)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &credentialspb.SignJwtResponse{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("POST", baseUrl.String(), bytes.NewReader(jsonReq))
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		httpRsp, err := c.httpClient.Do(httpReq)
		if err != nil {
			return err
		}
		defer httpRsp.Body.Close()

		if err = googleapi.CheckResponse(httpRsp); err != nil {
			return err
		}

		buf, err := io.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

		if err := unm.Unmarshal(buf, resp); err != nil {
			return err
		}

		return nil
	}, opts...)
	if e != nil {
		return nil, e
	}
	return resp, nil
}