imageViewData.go

// Copyright 2020 The Moov Authors
// Use of this source code is governed by an Apache License
// license that can be found in the LICENSE file.

package imagecashletter

import (
	"encoding/base64"
	"encoding/json"
	"fmt"
	"strings"
	"time"
)

// Errors specific to a ImageViewData Record

// ImageViewData Record
type ImageViewData struct {
	// ID is a client defined string used as a reference to this record.
	ID string `json:"id"`
	// recordType defines the type of record.
	recordType string
	// EceInstitutionRoutingNumber contains the routing and transit number of the institution that that creates the
	// bundle header.  Format: TTTTAAAAC, where:
	// TTTT Federal Reserve Prefix
	// AAAA ABA Institution Identifier
	// C Check Digit
	// For a number that identifies a non-financial institution: NNNNNNNNN
	EceInstitutionRoutingNumber string `json:"eceInstitutionRoutingNumber"`
	// BundleBusinessDate is the business date of the bundle.
	// Values:
	// YYYY 1993 through 9999
	// MM 01 through 12
	// DD 01 through 31
	BundleBusinessDate time.Time `json:"bundleBusinessDate"`
	// CycleNumber is a code assigned by the institution that creates the bundle.  Denotes the cycle under which
	// the bundle is created.
	CycleNumber string `json:"cycleNumber"`
	// EceInstitutionItemSequenceNumber is a number assigned by the institution that creates the CheckDetail Record or
	// Return.  This number is imported from the CheckDetail.ECEInstitutionItemSequenceNumber or
	// Return.ECEInstitutionItemSequenceNumber associated with the image view conveyed in this Image View Data Record.
	// The ECE institution must construct the sequence number to guarantee uniqueness for a given routing number,
	// business day, and cycle number. Must contain a numeric value.
	EceInstitutionItemSequenceNumber string `json:"eceInstitutionItemSequenceNumber"`
	// SecurityOriginatorName is a unique name that creates the Digital Signature for data to be exchanged.
	// Shall be present only under clearing arrangements and when ImageViewDetail.DigitalSignatureIndicator is 1
	// Shall not be present when ImageViewDetail.ImageIndicator is 0.
	SecurityOriginatorName string `json:"securityOriginatorName"`
	// SecurityAuthenticatorName is the unique name that performs authentication on received data.
	// Shall be present only under clearing arrangements and when ImageViewDetail.DigitalSignatureIndicator is 1
	// Shall not be present when ImageViewDetail.ImageIndicator is 0.
	SecurityAuthenticatorName string `json:"securityAuthenticatorName"`
	// SecurityKeyName is a name or character sequence used by the signer (originator) to communicate a key identifier
	// to the recipient (authenticator) so the recipient can obtain the key needed to validate the signature. The name
	// is typically used as an identifier related to the key pair used to sign the image. The name is mutually known to
	// the security originator and the security authenticator and is unique to this relationship.
	// Shall be present only under clearing arrangements and when ImageViewDetail.DigitalSignatureIndicator is 1
	// Shall not be present when ImageViewDetail.ImageIndicator is 0.
	SecurityKeyName string `json:"securityKeyName"`
	// ClippingOrigin is a code that defines the corner of the conveyed image view that is taken as the reference point
	// for the clipping coordinates. Top, bottom, left, and right references apply to a view that presents a visually
	// correct orientation. When clipping information is present, the nature of the Area of Interest defined by the
	// clipping rectangle is determined by the value of the ImageViewDetail.ViewDescriptor. Primary front and rear
	// views shall only have a Defined Value of 0.  Can be blank.
	// Values:
	// 0: Clipping information is not present–full view present
	// 1: Clipping origin is top left corner of image view
	// 2: Clipping origin is top right corner of image view
	// 3: Clipping origin is bottom right corner of image view
	// 4: Clipping origin is bottom left corner of image view
	ClippingOrigin int `json:"clippingOrigin"`
	// ClippingCoordinateH1 is a number that represents the horizontal offset in pixels from the clipping origin to the
	// nearest vertical side of the clipping rectangle. The clipping coordinates (h1, h2, v1, v2) convey the clipping
	// rectangle’s offsets in both horizontal (h) and vertical (v) directions. The offset values collectively establish
	// the boundary sides of the clipping rectangle. Pixels on the boundary of the clipping rectangle are included in
	// the selected array of pixels. That is, the first pixel of the selected array is at offset (h1, v1) and the last
	// pixel of the selected array is at offset (h2, v2). The corner pixel at the origin of the image view is assumed
	// to have the offset value (0, 0).
	// Shall be present if Image View Data.ClippingOrigin is present and non-zero.
	// Shall not be present when ImageViewDetail.ImageIndicator is 0.
	// Values: 0000–9999
	ClippingCoordinateH1 string `json:"clippingCoordinateH1"`
	// ClippingCoordinateH2 is a number that represents the horizontal offset in pixels from the clipping origin to the
	// furthermost vertical side of the clipping rectangle.
	// Shall be present if Image View Data.ClippingOrigin is present and non-zero.
	// Shall not be present when ImageViewDetail.ImageIndicator is 0.
	// Values: 0000–9999
	ClippingCoordinateH2 string `json:"clippingCoordinateH2"`
	// ClippingCoordinateV1 is a number that represents the vertical offset in pixels from the clipping origin to the
	// nearest horizontal side of the clipping rectangle.
	// Shall be present if Image View Data.ClippingOrigin is present and non-zero.
	// Shall not be present when ImageViewDetail.ImageIndicator is 0.
	// Values: 0000–9999
	ClippingCoordinateV1 string `json:"clippingCoordinateV1"`
	// ClippingCoordinateV2 is number that represents the vertical offset in pixels from the clipping origin to the
	// furthermost horizontal side of the clipping rectangle.
	// Shall be present if Image View Data.ClippingOrigin is present and non-zero.
	// Shall not be present when ImageViewDetail.ImageIndicator is 0.
	// Values: 0000–9999
	ClippingCoordinateV2 string `json:"clippingCoordinateV2"`
	// LengthImageReferenceKey is the number of characters in the ImageViewData.ImageReferenceKey.
	// Shall not be present when ImageViewDetail.ImageIndicator is 0.
	// Values: 0000	ImageReferenceKey is not present
	// 0001–9999: Valid when ImageReferenceKey is present
	LengthImageReferenceKey string `json:"lengthImageReferenceKey"`
	// ImageReferenceKey is assigned by the ECE institution that creates the CheckDetail or Return, and the related
	// Image View Records. This designator, when used, shall uniquely identify the item image to the ECE institution.
	// This designator is a special key with significance to the creating institution. It is intended to be used to
	// locate within an archive the unique image associated with the item. The designator could be a full access path
	// and name that would allow direct look up and access to the image, for example a URL. This shall match
	// CheckDetailAddendumB.ImageReferenceKey, or ReturnAddendumCImageReferenceKey Record, if used.
	// Size: 0 – 9999
	ImageReferenceKey string `json:"imageReferenceKey"`
	// LengthDigitalSignature is the number of bytes in the Image View Data.DigitalSignature.
	// Shall not be present when ImageViewDetail.ImageIndicator is 0.
	LengthDigitalSignature string `json:"lengthDigitalSignature"`
	// DigitalSignature is created by applying the cryptographic algorithm and private/secret key against the data to
	// be protected. The Digital Signature provides user authentication and data integrity.
	// Shall be present only under clearing arrangements and when ImageViewDetail.DigitalSignatureIndicator is 1
	// Shall not be present when ImageViewDetail.ImageIndicator is 0.
	// Size: 0-99999
	DigitalSignature []byte `json:"digitalSignature"`
	// LengthImageData is the number of bytes in the ImageViewData.ImageData.
	// Shall be present when ImageViewDetail.ImageIndicator is NOT 0
	// Values: 0000001–99999999
	LengthImageData string `json:"lengthImageData"`
	// ImageData contains the image view. The Image Data generally consists of an image header and the image raster
	// data. The image header provides information that is required to interpret the image raster data. The image
	// raster data contains the scanned image of the physical item in raster (line by line) format. Each scan line
	// comprises a set of concatenated pixels. The image comprises a set of scan lines. The image raster data is
	// typically compressed to reduce the number of bytes needed to transmit and store the image. The header/image
	// format type is defined by the ImageViewDetail.ImageViewFormatIndicator . The syntax and semantics of the image
	// header/image format are understood by referring to the appropriate image format specification. The compression
	// scheme used to compress the image raster data is specified in the
	// ImageViewDetail.ImageViewCompressionAlgorithmIdentifier and in the image header portion of the Image Data or by
	// association with the selected image format.
	// Shall be present when ImageViewDetail.ImageIndicator Record is NOT 0.
	// Size: 0-9999999
	ImageData []byte `json:"imageData"`
	// validator is composed for image cash letter data validation
	validator
	// converters is composed for image cash letter to golang Converters
	converters
}

// NewImageViewData returns a new ImageViewData with default values for non exported fields
func NewImageViewData() ImageViewData {
	ivData := ImageViewData{}
	ivData.setRecordType()
	return ivData
}

func (ivData *ImageViewData) setRecordType() {
	if ivData == nil {
		return
	}
	ivData.recordType = "52"
}

// ParseAndDecode takes the input record string, decodes all except image and parses the ImageViewData values
func (ivData *ImageViewData) ParseAndDecode(record string, decode DecodeLineFn) {
	// record contains binary data that may not map to UTF-8 charmap
	recordLength := len(record)
	if recordLength < 105 {
		return // line too short
	}
	// Character position 1-2, Always "52"
	ivData.setRecordType()
	// 03-11
	ivData.EceInstitutionRoutingNumber = ivData.parseStringField(decode(record[2:11]))
	// 12-19
	ivData.BundleBusinessDate = ivData.parseYYYYMMDDDate(decode(record[11:19]))
	// 20-21
	ivData.CycleNumber = ivData.parseStringField(decode(record[19:21]))
	// 22-36
	ivData.EceInstitutionItemSequenceNumber = ivData.parseStringField(decode(record[21:36]))
	// 37-52
	ivData.SecurityOriginatorName = ivData.parseStringField(decode(record[36:52]))
	// 53-68
	ivData.SecurityAuthenticatorName = ivData.parseStringField(decode(record[52:68]))
	// 69-84
	ivData.SecurityKeyName = ivData.parseStringField(decode(record[68:84]))
	// 85-85
	ivData.ClippingOrigin = ivData.parseNumField(decode(record[84:85]))
	// 86-89
	ivData.ClippingCoordinateH1 = ivData.parseStringField(decode(record[85:89]))
	// 90-93
	ivData.ClippingCoordinateH2 = ivData.parseStringField(decode(record[89:93]))
	// 94-97
	ivData.ClippingCoordinateV1 = ivData.parseStringField(decode(record[93:97]))
	// 98-101
	ivData.ClippingCoordinateV2 = ivData.parseStringField(decode(record[97:101]))
	// 102-105
	ivData.LengthImageReferenceKey = ivData.parseStringField(decode(record[101:105]))

	lirk := ivData.parseNumField(ivData.LengthImageReferenceKey)
	if lirk < 0 || recordLength < 110+lirk {
		return // line too short
	}

	// 106 - (105+X)
	ivData.ImageReferenceKey = ivData.parseStringField(decode(record[105 : 105+lirk]))
	// (106 + lirk) – (110 + lirk)
	ivData.LengthDigitalSignature = ivData.parseStringField(decode(record[105+lirk : 110+lirk]))

	lds := ivData.parseNumField(ivData.LengthDigitalSignature)
	if lds < 0 || recordLength < 117+lirk+lds {
		return // line too short
	}
	// (111 + lirk) – (110 + lirk + lds)
	ivData.DigitalSignature = ivData.stringToBytesField(decode(record[110+lirk : 110+lirk+lds]))
	// (111 + lirk + lds) – (117 + lirk + lds)
	ivData.LengthImageData = ivData.parseStringField(decode(record[110+lirk+lds : 117+lirk+lds]))

	lid := ivData.parseNumField(ivData.LengthImageData)
	if lid < 0 || recordLength < 117+lirk+lds+lid {
		return // line too short
	}
	// (118 + lirk + lds) – (117+lirk + lds + lid)
	ivData.ImageData = ivData.stringToBytesField(record[117+lirk+lds : 117+lirk+lds+lid])
}

// Parse takes the input record string and parses the ImageViewData values
func (ivData *ImageViewData) Parse(record string) {
	ivData.ParseAndDecode(record, Passthrough)
}

func (ivData *ImageViewData) UnmarshalJSON(data []byte) error {
	type Alias ImageViewData
	aux := struct {
		*Alias
	}{
		(*Alias)(ivData),
	}
	if err := json.Unmarshal(data, &aux); err != nil {
		return err
	}
	ivData.setRecordType()
	return nil
}

// String writes the ImageViewData struct to a string.
func (ivData *ImageViewData) String() string {
	return ivData.toString(true)
}

func (ivData *ImageViewData) toString(inclImage bool) string {
	var buf strings.Builder
	buf.Grow(105)
	buf.WriteString(ivData.recordType)
	buf.WriteString(ivData.EceInstitutionRoutingNumberField())
	buf.WriteString(ivData.BundleBusinessDateField())
	buf.WriteString(ivData.CycleNumberField())
	buf.WriteString(ivData.EceInstitutionItemSequenceNumberField())
	buf.WriteString(ivData.SecurityOriginatorNameField())
	buf.WriteString(ivData.SecurityAuthenticatorNameField())
	buf.WriteString(ivData.SecurityKeyNameField())
	buf.WriteString(ivData.ClippingOriginField())
	buf.WriteString(ivData.ClippingCoordinateH1Field())
	buf.WriteString(ivData.ClippingCoordinateH2Field())
	buf.WriteString(ivData.ClippingCoordinateV1Field())
	buf.WriteString(ivData.ClippingCoordinateV2Field())
	buf.WriteString(ivData.LengthImageReferenceKeyField())
	buf.Grow(ivData.parseNumField(ivData.LengthImageReferenceKey))
	buf.WriteString(ivData.ImageReferenceKeyField())
	buf.WriteString(ivData.LengthDigitalSignatureField())
	buf.Grow(ivData.parseNumField(ivData.LengthDigitalSignature))
	buf.WriteString(ivData.DigitalSignatureField())
	buf.WriteString(ivData.LengthImageDataField())
	if inclImage {
		buf.Grow(ivData.parseNumField(ivData.LengthImageData))
		buf.WriteString(ivData.ImageDataField())
	}
	return buf.String()
}

// Validate performs image cash letter format rule checks on the record and returns an error if not Validated
// The first error encountered is returned and stops the parsing.
func (ivData *ImageViewData) Validate() error {
	if err := ivData.fieldInclusion(); err != nil {
		return err
	}
	// Mandatory
	if ivData.recordType != "52" {
		msg := fmt.Sprintf(msgRecordType, 52)
		return &FieldError{FieldName: "recordType", Value: ivData.recordType, Msg: msg}
	}
	if err := ivData.isAlphanumeric(ivData.CycleNumber); err != nil {
		return &FieldError{FieldName: "CycleNumber", Value: ivData.CycleNumber, Msg: err.Error()}
	}
	if err := ivData.isAlphanumericSpecial(ivData.SecurityOriginatorName); err != nil {
		return &FieldError{FieldName: "SecurityOriginatorName", Value: ivData.SecurityOriginatorName, Msg: err.Error()}
	}
	if err := ivData.isAlphanumericSpecial(ivData.SecurityAuthenticatorName); err != nil {
		return &FieldError{FieldName: "SecurityAuthenticatorName", Value: ivData.SecurityAuthenticatorName, Msg: err.Error()}
	}
	if err := ivData.isAlphanumericSpecial(ivData.SecurityKeyName); err != nil {
		return &FieldError{FieldName: "SecurityKeyName", Value: ivData.SecurityKeyName, Msg: err.Error()}
	}
	if err := ivData.isAlphanumericSpecial(ivData.ImageReferenceKey); err != nil {
		return &FieldError{FieldName: "ImageReferenceKey", Value: ivData.ImageReferenceKey, Msg: err.Error()}
	}
	return nil
}

// fieldInclusion validate mandatory fields are not default values. If fields are
// invalid the Electronic Exchange will be returned.
func (ivData *ImageViewData) fieldInclusion() error {
	if ivData.recordType == "" {
		return &FieldError{FieldName: "recordType",
			Value: ivData.recordType,
			Msg:   msgFieldInclusion + ", did you use ImageViewData()?"}
	}
	if ivData.EceInstitutionRoutingNumber == "" {
		return &FieldError{FieldName: "EceInstitutionRoutingNumber",
			Value: ivData.EceInstitutionRoutingNumber,
			Msg:   msgFieldInclusion + ", did you use ImageViewData()?"}
	}
	if ivData.EceInstitutionRoutingNumberField() == "000000000" {
		return &FieldError{FieldName: "EceInstitutionRoutingNumber",
			Value: ivData.EceInstitutionRoutingNumber,
			Msg:   msgFieldInclusion + ", did you use ImageViewData()?"}
	}
	if ivData.BundleBusinessDate.IsZero() {
		return &FieldError{FieldName: "BundleBusinessDate",
			Value: ivData.BundleBusinessDate.String(),
			Msg:   msgFieldInclusion + ", did you use ImageViewData()?"}
	}
	return nil
}

// EceInstitutionRoutingNumberField gets the EceInstitutionRoutingNumber field
func (ivData *ImageViewData) EceInstitutionRoutingNumberField() string {
	return ivData.stringField(ivData.EceInstitutionRoutingNumber, 9)
}

// BundleBusinessDateField gets the BundleBusinessDate field
func (ivData *ImageViewData) BundleBusinessDateField() string {
	return ivData.formatYYYYMMDDDate(ivData.BundleBusinessDate)
}

// CycleNumberField gets the CycleNumber field
func (ivData *ImageViewData) CycleNumberField() string {
	return ivData.alphaField(ivData.CycleNumber, 2)
}

// EceInstitutionItemSequenceNumberField gets a string of the EceInstitutionItemSequenceNumber field
func (ivData *ImageViewData) EceInstitutionItemSequenceNumberField() string {
	return ivData.alphaField(ivData.EceInstitutionItemSequenceNumber, 15)
}

// SecurityOriginatorNameField gets the SecurityOriginatorName field
func (ivData *ImageViewData) SecurityOriginatorNameField() string {
	return ivData.alphaField(ivData.SecurityOriginatorName, 16)
}

// SecurityAuthenticatorNameField gets the SecurityAuthenticatorName field
func (ivData *ImageViewData) SecurityAuthenticatorNameField() string {
	return ivData.alphaField(ivData.SecurityAuthenticatorName, 16)
}

// SecurityKeyNameField gets the SecurityKeyName field
func (ivData *ImageViewData) SecurityKeyNameField() string {
	return ivData.alphaField(ivData.SecurityKeyName, 16)
}

// ClippingOriginField gets the ClippingOrigin field
func (ivData *ImageViewData) ClippingOriginField() string {
	return ivData.numericField(ivData.ClippingOrigin, 1)
}

// ClippingCoordinateH1Field gets the ClippingCoordinateH1 field
func (ivData *ImageViewData) ClippingCoordinateH1Field() string {
	return ivData.alphaField(ivData.ClippingCoordinateH1, 4)
}

// ClippingCoordinateH2Field gets the ClippingCoordinateH2 field
func (ivData *ImageViewData) ClippingCoordinateH2Field() string {
	return ivData.alphaField(ivData.ClippingCoordinateH2, 4)
}

// ClippingCoordinateV1Field gets the ClippingCoordinateV1 field
func (ivData *ImageViewData) ClippingCoordinateV1Field() string {
	return ivData.alphaField(ivData.ClippingCoordinateH1, 4)
}

// ClippingCoordinateV2Field gets the ClippingCoordinateH2 field
func (ivData *ImageViewData) ClippingCoordinateV2Field() string {
	return ivData.alphaField(ivData.ClippingCoordinateV2, 4)
}

// LengthImageReferenceKeyField gets the LengthImageReferenceKey field
func (ivData *ImageViewData) LengthImageReferenceKeyField() string {
	return ivData.stringField(ivData.LengthImageReferenceKey, 4)
}

// ImageReferenceKeyField gets the ImageReferenceKey field
func (ivData *ImageViewData) ImageReferenceKeyField() string {
	return ivData.alphaField(ivData.ImageReferenceKey, uint(ivData.parseNumField(ivData.LengthImageReferenceKey)))
}

// LengthDigitalSignatureField gets the LengthDigitalSignature field
func (ivData *ImageViewData) LengthDigitalSignatureField() string {
	return ivData.alphaField(ivData.LengthDigitalSignature, 5)
}

// DigitalSignatureField gets the DigitalSignature field []byte to string
func (ivData *ImageViewData) DigitalSignatureField() string {
	s := string(ivData.DigitalSignature[:])
	return ivData.alphaField(s, uint(ivData.parseNumField(ivData.LengthDigitalSignature)))
}

// LengthImageDataField gets the LengthImageData field
func (ivData *ImageViewData) LengthImageDataField() string {
	return ivData.alphaField(ivData.LengthImageData, 7)
}

// ImageDataField gets the ImageData field []byte to string
func (ivData *ImageViewData) ImageDataField() string {
	// Try and decode our image data, otherwise use the raw bytes.
	if decoded, err := ivData.DecodeImageData(); len(decoded) > 0 && err == nil {
		return ivData.alphaField(string(decoded[:]), uint(len(decoded)))
	}

	// Return the untouched image data padded according to the spec
	s := string(ivData.ImageData[:])
	return ivData.alphaField(s, uint(ivData.parseNumField(ivData.LengthImageData)))
}

// DecodeImageData attempts to read ImageData as a base64 blob. Other formats may be
// supported in the future.
func (ivData *ImageViewData) DecodeImageData() ([]byte, error) {
	if ivData == nil || len(ivData.ImageData) == 0 {
		return nil, nil
	}

	// Setup output buffer
	out := make([]byte, base64.StdEncoding.DecodedLen(len(ivData.ImageData)))

	// Decode the image data
	n, err := base64.StdEncoding.Decode(out, ivData.ImageData)
	if n == 0 || err != nil {
		return nil, err
	}
	return out, nil
}