api_op_DetectText.go

// Code generated by smithy-go-codegen DO NOT EDIT.

package rekognition

import (
	"context"
	"errors"
	"fmt"
	"github.com/aws/aws-sdk-go-v2/aws"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/aws-sdk-go-v2/aws/signer/v4"
	internalauth "github.com/aws/aws-sdk-go-v2/internal/auth"
	"github.com/aws/aws-sdk-go-v2/service/rekognition/types"
	smithyendpoints "github.com/aws/smithy-go/endpoints"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Detects text in the input image and converts it into machine-readable text.
// Pass the input image as base64-encoded image bytes or as a reference to an image
// in an Amazon S3 bucket. If you use the AWS CLI to call Amazon Rekognition
// operations, you must pass it as a reference to an image in an Amazon S3 bucket.
// For the AWS CLI, passing image bytes is not supported. The image must be either
// a .png or .jpeg formatted file. The DetectText operation returns text in an
// array of TextDetection elements, TextDetections . Each TextDetection element
// provides information about a single word or line of text that was detected in
// the image. A word is one or more script characters that are not separated by
// spaces. DetectText can detect up to 100 words in an image. A line is a string
// of equally spaced words. A line isn't necessarily a complete sentence. For
// example, a driver's license number is detected as a line. A line ends when there
// is no aligned text after it. Also, a line ends when there is a large gap between
// words, relative to the length of the words. This means, depending on the gap
// between words, Amazon Rekognition may detect multiple lines in text aligned in
// the same direction. Periods don't represent the end of a line. If a sentence
// spans multiple lines, the DetectText operation returns multiple lines. To
// determine whether a TextDetection element is a line of text or a word, use the
// TextDetection object Type field. To be detected, text must be within +/- 90
// degrees orientation of the horizontal axis. For more information, see Detecting
// text in the Amazon Rekognition Developer Guide.
func (c *Client) DetectText(ctx context.Context, params *DetectTextInput, optFns ...func(*Options)) (*DetectTextOutput, error) {
	if params == nil {
		params = &DetectTextInput{}
	}

	result, metadata, err := c.invokeOperation(ctx, "DetectText", params, optFns, c.addOperationDetectTextMiddlewares)
	if err != nil {
		return nil, err
	}

	out := result.(*DetectTextOutput)
	out.ResultMetadata = metadata
	return out, nil
}

type DetectTextInput struct {

	// The input image as base64-encoded bytes or an Amazon S3 object. If you use the
	// AWS CLI to call Amazon Rekognition operations, you can't pass image bytes. If
	// you are using an AWS SDK to call Amazon Rekognition, you might not need to
	// base64-encode image bytes passed using the Bytes field. For more information,
	// see Images in the Amazon Rekognition developer guide.
	//
	// This member is required.
	Image *types.Image

	// Optional parameters that let you set the criteria that the text must meet to be
	// included in your response.
	Filters *types.DetectTextFilters

	noSmithyDocumentSerde
}

type DetectTextOutput struct {

	// An array of text that was detected in the input image.
	TextDetections []types.TextDetection

	// The model version used to detect text.
	TextModelVersion *string

	// Metadata pertaining to the operation's result.
	ResultMetadata middleware.Metadata

	noSmithyDocumentSerde
}

func (c *Client) addOperationDetectTextMiddlewares(stack *middleware.Stack, options Options) (err error) {
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpDetectText{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpDetectText{}, middleware.After)
	if err != nil {
		return err
	}
	if err = addlegacyEndpointContextSetter(stack, options); err != nil {
		return err
	}
	if err = addSetLoggerMiddleware(stack, options); err != nil {
		return err
	}
	if err = awsmiddleware.AddClientRequestIDMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddComputeContentLengthMiddleware(stack); err != nil {
		return err
	}
	if err = addResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = v4.AddComputePayloadSHA256Middleware(stack); err != nil {
		return err
	}
	if err = addRetryMiddlewares(stack, options); err != nil {
		return err
	}
	if err = addHTTPSignerV4Middleware(stack, options); err != nil {
		return err
	}
	if err = awsmiddleware.AddRawResponseToMetadata(stack); err != nil {
		return err
	}
	if err = awsmiddleware.AddRecordResponseTiming(stack); err != nil {
		return err
	}
	if err = addClientUserAgent(stack, options); err != nil {
		return err
	}
	if err = smithyhttp.AddErrorCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = addDetectTextResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = addOpDetectTextValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opDetectText(options.Region), middleware.Before); err != nil {
		return err
	}
	if err = awsmiddleware.AddRecursionDetection(stack); err != nil {
		return err
	}
	if err = addRequestIDRetrieverMiddleware(stack); err != nil {
		return err
	}
	if err = addResponseErrorMiddleware(stack); err != nil {
		return err
	}
	if err = addRequestResponseLogging(stack, options); err != nil {
		return err
	}
	if err = addendpointDisableHTTPSMiddleware(stack, options); err != nil {
		return err
	}
	return nil
}

func newServiceMetadataMiddleware_opDetectText(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		SigningName:   "rekognition",
		OperationName: "DetectText",
	}
}

type opDetectTextResolveEndpointMiddleware struct {
	EndpointResolver EndpointResolverV2
	BuiltInResolver  builtInParameterResolver
}

func (*opDetectTextResolveEndpointMiddleware) ID() string {
	return "ResolveEndpointV2"
}

func (m *opDetectTextResolveEndpointMiddleware) HandleSerialize(ctx context.Context, in middleware.SerializeInput, next middleware.SerializeHandler) (
	out middleware.SerializeOutput, metadata middleware.Metadata, err error,
) {
	if awsmiddleware.GetRequiresLegacyEndpoints(ctx) {
		return next.HandleSerialize(ctx, in)
	}

	req, ok := in.Request.(*smithyhttp.Request)
	if !ok {
		return out, metadata, fmt.Errorf("unknown transport type %T", in.Request)
	}

	if m.EndpointResolver == nil {
		return out, metadata, fmt.Errorf("expected endpoint resolver to not be nil")
	}

	params := EndpointParameters{}

	m.BuiltInResolver.ResolveBuiltIns(&params)

	var resolvedEndpoint smithyendpoints.Endpoint
	resolvedEndpoint, err = m.EndpointResolver.ResolveEndpoint(ctx, params)
	if err != nil {
		return out, metadata, fmt.Errorf("failed to resolve service endpoint, %w", err)
	}

	req.URL = &resolvedEndpoint.URI

	for k := range resolvedEndpoint.Headers {
		req.Header.Set(
			k,
			resolvedEndpoint.Headers.Get(k),
		)
	}

	authSchemes, err := internalauth.GetAuthenticationSchemes(&resolvedEndpoint.Properties)
	if err != nil {
		var nfe *internalauth.NoAuthenticationSchemesFoundError
		if errors.As(err, &nfe) {
			// if no auth scheme is found, default to sigv4
			signingName := "rekognition"
			signingRegion := m.BuiltInResolver.(*builtInResolver).Region
			ctx = awsmiddleware.SetSigningName(ctx, signingName)
			ctx = awsmiddleware.SetSigningRegion(ctx, signingRegion)

		}
		var ue *internalauth.UnSupportedAuthenticationSchemeSpecifiedError
		if errors.As(err, &ue) {
			return out, metadata, fmt.Errorf(
				"This operation requests signer version(s) %v but the client only supports %v",
				ue.UnsupportedSchemes,
				internalauth.SupportedSchemes,
			)
		}
	}

	for _, authScheme := range authSchemes {
		switch authScheme.(type) {
		case *internalauth.AuthenticationSchemeV4:
			v4Scheme, _ := authScheme.(*internalauth.AuthenticationSchemeV4)
			var signingName, signingRegion string
			if v4Scheme.SigningName == nil {
				signingName = "rekognition"
			} else {
				signingName = *v4Scheme.SigningName
			}
			if v4Scheme.SigningRegion == nil {
				signingRegion = m.BuiltInResolver.(*builtInResolver).Region
			} else {
				signingRegion = *v4Scheme.SigningRegion
			}
			if v4Scheme.DisableDoubleEncoding != nil {
				// The signer sets an equivalent value at client initialization time.
				// Setting this context value will cause the signer to extract it
				// and override the value set at client initialization time.
				ctx = internalauth.SetDisableDoubleEncoding(ctx, *v4Scheme.DisableDoubleEncoding)
			}
			ctx = awsmiddleware.SetSigningName(ctx, signingName)
			ctx = awsmiddleware.SetSigningRegion(ctx, signingRegion)
			break
		case *internalauth.AuthenticationSchemeV4A:
			v4aScheme, _ := authScheme.(*internalauth.AuthenticationSchemeV4A)
			if v4aScheme.SigningName == nil {
				v4aScheme.SigningName = aws.String("rekognition")
			}
			if v4aScheme.DisableDoubleEncoding != nil {
				// The signer sets an equivalent value at client initialization time.
				// Setting this context value will cause the signer to extract it
				// and override the value set at client initialization time.
				ctx = internalauth.SetDisableDoubleEncoding(ctx, *v4aScheme.DisableDoubleEncoding)
			}
			ctx = awsmiddleware.SetSigningName(ctx, *v4aScheme.SigningName)
			ctx = awsmiddleware.SetSigningRegion(ctx, v4aScheme.SigningRegionSet[0])
			break
		case *internalauth.AuthenticationSchemeNone:
			break
		}
	}

	return next.HandleSerialize(ctx, in)
}

func addDetectTextResolveEndpointMiddleware(stack *middleware.Stack, options Options) error {
	return stack.Serialize.Insert(&opDetectTextResolveEndpointMiddleware{
		EndpointResolver: options.EndpointResolverV2,
		BuiltInResolver: &builtInResolver{
			Region:       options.Region,
			UseDualStack: options.EndpointOptions.UseDualStackEndpoint,
			UseFIPS:      options.EndpointOptions.UseFIPSEndpoint,
			Endpoint:     options.BaseEndpoint,
		},
	}, "ResolveEndpoint", middleware.After)
}