feat: processed eMRTD parsed data (#31)

package.json

@@ -82,6 +82,7 @@
     "credo-ts-media-sharing": "^0.0.1-alpha.9",
     "credo-ts-receipts": "^0.0.1-alpha.5",
     "express": "^4.18.1",
+    "mrz": "^4.2.0",
     "qrcode": "^1.5.3",
     "reflect-metadata": "^0.1.13",
     "swagger-ui-express": "^4.4.0",

src/model/messages/mrtd/EMrtdDataSubmitMessage.ts

@@ -1,9 +1,37 @@
 import { EMrtdData } from '@2060.io/credo-ts-didcomm-mrtd'
 import { Expose } from 'class-transformer'
+import * as Mrz from 'mrz'
 
 import { BaseMessage, BaseMessageOptions } from '../BaseMessage'
 import { MessageType } from '../MessageType'
 
+export type EMrtdRawData = {
+  raw: Record<string, string>
+  processed: {
+    documentType: string
+    documentNumber?: string
+    issuingState?: string
+    dateOfBirth?: string
+    dateOfExpiry?: string
+    sex?: string
+    nationality?: string
+    lastName?: string
+    firstName?: string
+    mrzOptionalData?: string
+    faceImages: string[]
+    nameOfHolder?: string
+    otherNames?: string[]
+    personalNumber?: string
+    placeOfBirth?: string[]
+    permanentAddress?: string[]
+    telephone?: string
+    profession?: string
+    title?: string
+    personalSummary?: string
+    custodyInformation?: string
+  }
+}
+
 export interface EMrtdDataSubmitMessageOptions extends BaseMessageOptions {
   dataGroups: EMrtdData
 }
@@ -17,13 +45,74 @@ export class EMrtdDataSubmitMessage extends BaseMessage {
       this.threadId = options.threadId
       this.timestamp = options.timestamp ?? new Date()
       this.connectionId = options.connectionId
-      this.dataGroups = options.dataGroups
+      this.dataGroups = this.parseDataGroups(options.dataGroups)
     }
   }
 
   public readonly type = EMrtdDataSubmitMessage.type
   public static readonly type = MessageType.EMrtdDataSubmitMessage
 
   @Expose()
-  public dataGroups!: EMrtdData
+  public dataGroups!: EMrtdRawData
+
+  public parseDataGroups({ raw, parsed }: EMrtdData): EMrtdRawData {
+    if (!parsed || !parsed.fields) return this.dataGroups
+
+    const dataUrls = parsed.fields.images.map(image => {
+      const faceMimeType = image.imageType === 1 ? 'image/jp2' : 'image/jpeg'
+      return `data:${faceMimeType};base64,${image.imageData.toString('base64')}`
+    })
+
+    const mrzString = parsed.fields.mrzData
+    const formattedMrz = (len => {
+      switch (len) {
+        case 88:
+          return mrzString.slice(0, 44) + '\n' + mrzString.slice(44)
+        case 72:
+          return mrzString.slice(0, 36) + '\n' + mrzString.slice(36)
+        case 90:
+          return mrzString.slice(0, 30) + '\n' + mrzString.slice(30, 60) + '\n' + mrzString.slice(60)
+        case 30:
+          return mrzString
+        case 18:
+          return mrzString.slice(0, 9) + '\n' + mrzString.slice(9)
+        default:
+          throw new Error(`Unrecognized MRZ length: ${len}`)
+      }
+    })(mrzString.length)
+    const parsedMrz = Mrz.parse(formattedMrz)
+
+    const newEmrtdData: EMrtdRawData = {
+      raw: raw,
+      processed: {
+        documentType: parsedMrz.format,
+        documentNumber: parsedMrz.documentNumber ?? undefined,
+        issuingState: parsedMrz.fields.issuingState ?? undefined,
+        dateOfExpiry: parsedMrz.fields.expirationDate ?? undefined, // TODO: Check and specify date format
+        sex: parsedMrz.fields.sex ?? undefined,
+        nationality: parsedMrz.fields.nationality ?? undefined,
+        lastName: parsedMrz.fields.lastName ?? undefined,
+        firstName: parsedMrz.fields.firstName ?? undefined,
+        mrzOptionalData: parsedMrz.fields.optional1 ?? undefined,
+        faceImages: dataUrls,
+        nameOfHolder:
+          parsed.fields.additionalPersonalData?.nameOfHolder ??
+          `${parsedMrz.fields.lastName} ${parsedMrz.fields.firstName}`,
+        dateOfBirth:
+          parsed.fields.additionalPersonalData?.fullDateOfBirth.toString() ??
+          parsedMrz.fields.birthDate ??
+          undefined, // TODO: Check and specify date format
+        otherNames: parsed.fields.additionalPersonalData?.otherNames,
+        personalNumber: parsed.fields.additionalPersonalData?.personalNumber,
+        placeOfBirth: parsed.fields.additionalPersonalData?.placeOfBirth,
+        permanentAddress: parsed.fields.additionalPersonalData?.permanentAddress,
+        telephone: parsed.fields.additionalPersonalData?.telephone,
+        profession: parsed.fields.additionalPersonalData?.profession,
+        title: parsed.fields.additionalPersonalData?.title,
+        personalSummary: parsed.fields.additionalPersonalData?.personalSummary,
+        custodyInformation: parsed.fields.additionalPersonalData?.custodyInformation,
+      },
+    }
+    return newEmrtdData
+  }
 }