Implementation
SessionStatus handleSession(SessionStatus session, OcrData ocr) {
try {
final List<String> lines = ocr.lines.map((a) => a.text).toList();
final List<String> baseLines = List<String>.of(ocr.lines.map((a) => a.text).toList());
SessionStatus updatedSession = session;
if (updatedSession.step == 0) {
updatedSession = updatedSession.copyWith(step: 1, dateTime: DateTime.now(), details: "Looking for BirthGenderExp", ocr: ocr);
}
// log("handleSession ${updatedSession.step}");
if (updatedSession.step == 1) {
String secondLineGuess = lines.firstWhere((a) => _dateSexRe.hasMatch(a), orElse: () => '');
if (secondLineGuess.isNotEmpty) {
final dateSexMatch = _dateSexRe.firstMatch(secondLineGuess);
String dateSexStr = dateSexMatch!.group(0)!;
final birthDateStr = dateSexMatch.group(1);
final birthCheck = dateSexMatch.group(2);
final sexStr = dateSexMatch.group(3);
final expiryDateStr = dateSexMatch.group(4);
final expiryCheck = dateSexMatch.group(5);
bool birthDateValid = _computeMrzCheckDigit(birthDateStr!) == birthCheck;
bool expDateValid = _computeMrzCheckDigit(expiryDateStr!) == expiryCheck;
bool sexValid = ["M", "F", "X", "<"].contains(sexStr);
var currentVal = updatedSession.validation ?? OcrMrzValidation();
currentVal.birthDateValid = birthDateValid;
currentVal.expiryDateValid = expDateValid;
currentVal.sexValid = sexValid;
if (birthDateValid && expDateValid) {
updatedSession = updatedSession.copyWith(
step: 2,
details: "Found Dates and Gender",
validation: currentVal,
birthDate: birthDateStr,
expiryDate: expiryDateStr,
sex: sexStr,
dateSexStr: dateSexStr,
line2: secondLineGuess,
birthCheck: birthCheck,
expCheck: expiryCheck,
logDetails: "Found Valid Birth Sex Gender => $dateSexStr",
);
} else {
updatedSession = updatedSession.copyWith(
step: 1,
details: "Looking for valid Dates",
validation: currentVal,
birthDate: birthDateStr,
expiryDate: expiryDateStr,
sex: sexStr,
dateSexStr: dateSexStr,
line2: secondLineGuess,
birthCheck: birthCheck,
expCheck: expiryCheck,
logDetails: "Found Invalid Birth Sex Gender => $dateSexStr",
);
}
}
}
if (updatedSession.step == 2) {
String? type;
final parts = updatedSession.dateSexStr!.split(RegExp(r'[^0-9]+'));
String? nationalityStr;
String birth = parts[0];
String exp = parts[1];
// log("look before $birth or after $exp ${updatedSession.line2??''}");
// final countryBeforeBirthReg = RegExp(r'[A-Za-z]{3}' + birth);
final countryBeforeBirthReg = RegExp(r'([A-Za-z0-9]{3})(?=' + RegExp.escape(birth) + r')');
final countryAfterExpReg = RegExp(RegExp.escape(exp) + r'([A-Za-z]{3})');
String line1 = "";
String? line3;
for (var l in lines) {
int index = lines.indexOf(l);
l = normalize(l);
final countryBeforeBirthMatch = countryBeforeBirthReg.firstMatch(normalize(l));
if (countryBeforeBirthMatch != null) {
// log("we have before ${countryBeforeBirthMatch.group(0)}");
type = l.length < 40 ? "td2" : "td3";
nationalityStr = countryBeforeBirthMatch.group(0)!;
if (index != 0) {
line1 = lines[index - 1];
}
updatedSession = updatedSession.copyWith(logDetails: "Found Valid Nationality ${nationalityStr} in ${countryBeforeBirthMatch.group(0)}$birth");
}
final countryAfterExpMatch = countryAfterExpReg.firstMatch(normalize(l));
if (countryAfterExpMatch != null && normalize(l).startsWith(birth)) {
// log("we have match after ${countryAfterExpMatch.group(1)}");
type = "td1";
nationalityStr = countryAfterExpMatch.group(1)!;
if (index != 0) {
line1 = lines[index - 1];
}
if (index != lines.length - 1) {
line3 = lines[index + 1];
}
updatedSession = updatedSession.copyWith(logDetails: "Found Valid Nationality ${nationalityStr} in $exp${countryAfterExpMatch.group(0)}");
} else {
// log("not countryAfterExpReg ${normalize(l)}");
}
if (nationalityStr != null) {
final fixedNationalityStr = fixAlphaOnlyField(nationalityStr);
if (isValidMrzCountry(nationalityStr) || isValidMrzCountry(fixedNationalityStr)) {
var currentVal = updatedSession.validation ?? OcrMrzValidation();
currentVal.nationalityValid = isValidMrzCountry(nationalityStr) || isValidMrzCountry(fixedNationalityStr);
updatedSession = updatedSession.copyWith(step: 3, details: 'Found nationality', nationality: nationalityStr, type: type, line1: line1, line2: normalize(l), line3: line3, validation: currentVal);
}
// final fixedNationalityStr = fixAlphaOnlyField(nationalityStr);
if (isValidMrzCountry(nationalityStr)) {
var currentVal = updatedSession.validation ?? OcrMrzValidation();
currentVal.nationalityValid = isValidMrzCountry(nationalityStr);
updatedSession = updatedSession.copyWith(step: 3, details: 'Found nationality', nationality: nationalityStr, type: type, line1: line1, line2: normalize(l), line3: line3, validation: currentVal);
}
} else {
updatedSession = updatedSession.copyWith(logDetails: "Did not found valid Nationality before $birth or after $exp in\n${lines.where((a) => a.contains(birth) || a.contains(exp)).map((b) => normalize(b)).join("\n")}");
// log("not valid nat ${nationalityStr} in ${lines.map((a) => normalize(a)).join("\n")}");
}
}
}
if (updatedSession.step == 3) {
String? numberStr;
if (updatedSession.type == "td1") {
String dateStart = updatedSession.birthDate!;
for (var l in lines) {
int index = lines.indexOf(l);
if (l.startsWith(dateStart)) {
// log("we have before ${countryBeforeBirthMatch.group(0)}");
// numberStr = numberBeforeNatMatch.group(1)!.replaceAll("O", '0').replaceAll("<", '');
// String numberStrCheck = numberBeforeNatMatch.group(2)!;
// bool docNumberValid = _computeMrzCheckDigit(numberStr!) == numberStrCheck;
// currentVal.docNumberValid = docNumberValid;
var currentVal = updatedSession.validation!;
String firstLineGuess = normalize(lines[index - 1]);
if (firstLineGuess.length >= 15) {
String firstFiveChars = firstLineGuess.substring(0, 5);
String docCode = firstFiveChars.substring(0, 2);
String countryCode = firstFiveChars.substring(2, 5);
bool validCode = DocumentCodeHelper.isValid(docCode);
log("valid code ${validCode} ==> ${docCode}");
bool validCountry = isValidMrzCountry(countryCode);
if (validCode && validCountry) {
numberStr = firstLineGuess.substring(5, 14);
final numberStrCheck = firstLineGuess[14];
bool validDocNumber = _computeMrzCheckDigit(numberStr) == numberStrCheck;
currentVal.countryValid = validCountry;
currentVal.docCodeValid = validCode;
updatedSession = updatedSession.copyWith(
step: 3,
line1: normalizeWithLength(normalize(firstLineGuess), len: 30),
line2: normalizeWithLength("${dateStart}${countryCode}", len: 30),
details: "Found Number Code Country : $numberStr",
countryCode: countryCode,
docCode: docCode,
validation: currentVal,
numberCheck: numberStrCheck,
logDetails: "Found valid $countryCode DocCode $docCode",
);
currentVal.docNumberValid = validDocNumber;
currentVal.linesLengthValid = true;
currentVal.finalCheckValid = true;
currentVal.personalNumberValid = true;
if (validDocNumber) {
updatedSession = updatedSession.copyWith(
step: 4,
line1: normalizeWithLength(normalize(firstLineGuess), len: 30),
line2: normalizeWithLength("${dateStart}${numberStr}${numberStrCheck}", len: 30),
details: "Found Number Code Country : $numberStr",
countryCode: countryCode,
docCode: docCode,
docNumber: numberStr,
validation: currentVal,
numberCheck: numberStrCheck,
logDetails: "Found valid Number: $numberStr Country: $countryCode DocCode $docCode",
);
} else {
// log("invalid doc number $numberStr checked $numberStrCheck\n${normalizeWithLength(normalize(firstLineGuess), len: 30)}");
}
}
}
// log("numberStr $numberStr");
// log("numberStrCheck $numberStrCheck");
}
// if (nationalityStr != null) {
// if (isValidMrzCountry(nationalityStr)) {
// var currentVal = updatedSession.validation ?? OcrMrzValidation();
// currentVal.nationalityValid = isValidMrzCountry(nationalityStr);
// updatedSession = updatedSession.copyWith(step: 3, details: 'Found nationality', nationality: nationalityStr, type: type, line1: line1, line2: normalize(l), line3: line3, validation: currentVal);
// }
// }
}
} else {
final parts = updatedSession.dateSexStr!.split(RegExp(r'[^0-9]+'));
String birth = parts[0];
String natBirth = "${updatedSession.nationality}$birth";
String natOnly = "${updatedSession.nationality}";
// final numberBeforeNatReg = RegExp(r'^(.*?)(?=' + RegExp.escape(natBirth) + r')');
final numberBeforeNatReg = RegExp(r'([A-Z0-9<]{9,12})(\d)(?=' + RegExp.escape(natOnly) + r')');
for (var l in lines) {
int index = lines.indexOf(l);
final numberBeforeNatMatch = numberBeforeNatReg.firstMatch(normalize(l));
if (numberBeforeNatMatch != null && index != 0) {
// log("we have before ${countryBeforeBirthMatch.group(0)}");
numberStr = numberBeforeNatMatch.group(1)!.replaceAll("O", '0').replaceAll("<", '');
String numberStrCheck = numberBeforeNatMatch.group(2)!;
bool docNumberValid = _computeMrzCheckDigit(numberStr!) == numberStrCheck;
var currentVal = updatedSession.validation!;
currentVal.docNumberValid = docNumberValid;
String firstLineGuess = lines[index - 1];
if (firstLineGuess.length > 5) {
String firstFiveChars = firstLineGuess.substring(0, 5);
String docCode = firstFiveChars.substring(0, 2);
String countryCode = firstFiveChars.substring(2, 5);
bool validCode = DocumentCodeHelper.isValid(docCode);
bool validCountry = isValidMrzCountry(countryCode);
if (validCode && validCountry) {
currentVal.countryValid = validCountry;
currentVal.docCodeValid = validCode;
currentVal.finalCheckValid = true;
currentVal.personalNumberValid = true;
currentVal.linesLengthValid = true;
updatedSession = updatedSession.copyWith(
step: 4,
details: "Found Number Code Country : $numberStr",
line2: normalizeWithLength('${updatedSession.docNumber}${numberStrCheck}${updatedSession.dateSexStr}${updatedSession.optional ?? ''}', len: 44),
countryCode: countryCode,
docCode: docCode,
docNumber: numberStr,
validation: currentVal,
nationality: fixAlphaOnlyField(natOnly),
numberCheck: numberStrCheck,
logDetails: "Found valid Number: $numberStr Country: $countryCode DocCode $docCode",
);
}
}
// log("numberStr $numberStr");
// log("numberStrCheck $numberStrCheck");
}
// if (nationalityStr != null) {
// if (isValidMrzCountry(nationalityStr)) {
// var currentVal = updatedSession.validation ?? OcrMrzValidation();
// currentVal.nationalityValid = isValidMrzCountry(nationalityStr);
// updatedSession = updatedSession.copyWith(step: 3, details: 'Found nationality', nationality: nationalityStr, type: type, line1: line1, line2: normalize(l), line3: line3, validation: currentVal);
// }
// }
}
}
}
// if (updatedSession.step == 4) {
// String? numberStr;
// if (updatedSession.type == DocumentStandardType.td1) {
// } else {
// for (var l in lines) {
// int index = lines.indexOf(l);
// if (l.startsWith(updatedSession.docNumber!) && index > 0) {
// String line1 = fixAlphaOnlyField(lines[index - 1]);
// if (line1.length > 13) {
// String firstFiveChars = line1.substring(0, 5);
// String docCode = firstFiveChars.substring(0, 2);
// String countryCode = firstFiveChars.substring(2, 5);
// bool validCode = DocumentCodeHelper.isValid(docCode);
// bool validCountry = isValidMrzCountry(countryCode);
// var currentVal = updatedSession.validation!;
// currentVal.countryValid = validCountry;
// currentVal.docCodeValid = validCode;
//
// if (validCountry && validCode) {
// updatedSession = updatedSession.copyWith(step: 5, details: 'Found nationality', line1: normalize(line1), line2: l, countryCode: countryCode, docCode: docCode);
// }
// }
// }
// }
// }
// }
if (updatedSession.step == 4) {
if (updatedSession.type == "td1") {
if(lines.length>2){
String line3 = lines[2];
MrzName? name = parseNamesTd1(line3);
String firstName = name.givenNames.join(" ");
String lastName = name.surname;
List<String> otherLines = [...lines.where((a) => a != line3).map((a) => normalize(a))];
var currentVal = updatedSession.validation ?? OcrMrzValidation();
var(a,_,__) = name.validateNames(otherLines,OcrMrzSetting(nameValidationMode: NameValidationMode.exact),[]);
currentVal.nameValid = a;
updatedSession = updatedSession.copyWith(step: 5, details: 'Found names', line3: normalize(line3), firstName: firstName, lastName: lastName, validation: currentVal, logDetails: "Found Name: $firstName $lastName");
}
} else {
String line1Start = updatedSession.docCode! + updatedSession.countryCode!;
for (var l in lines) {
if (l.startsWith(line1Start)) {
MrzName? name = parseNamesTd3OrTd2(l);
String firstName = name.givenNames.join(" ");
String lastName = name.surname;
List<String> otherLines = [...lines.where((a) => a != l).map((a) => normalize(a))];
var currentVal = updatedSession.validation ?? OcrMrzValidation();
var(a,_,__)= name.validateNames(otherLines,OcrMrzSetting(nameValidationMode: NameValidationMode.exact),[]);
currentVal.nameValid = a;
updatedSession = updatedSession.copyWith(step: 5, details: 'Found names', line1: normalize(l), firstName: firstName, lastName: lastName, validation: currentVal, logDetails: "Found Name: $firstName $lastName");
}
}
}
}
// if (updatedSession.step == 6) {
// if (updatedSession.type == DocumentStandardType.td1) {
// } else {
// final optionalAndFinalCheckReg = RegExp(r'^(.*?<+)(\d{0,2})$');
// // String datesSex = updatedSession.dateSexStr!;
// String expWithCheck = updatedSession.expiryDate! + updatedSession.expCheck!;
// for (var l in baseLines) {
// l = normalize(l);
// if (l.length > 20) {
// List<String> parts = l.split(expWithCheck);
// if (parts.length > 1) {
// String optionalAndFinalGuess = parts[1];
// final optionalAndFinalCheckMatch = optionalAndFinalCheckReg.firstMatch(optionalAndFinalGuess);
// if (optionalAndFinalCheckMatch != null) {
// String optionalStr = optionalAndFinalCheckMatch.group(1)!;
// String finalCheckStr = optionalAndFinalCheckMatch.group(2)!;
//
// bool finalCheckValid = (updatedSession.getFinalCheckValue)==_computeMrzCheckDigit(finalCheckStr);
// var currentVal = updatedSession.validation!;
// currentVal.finalCheckValid = finalCheckValid;
// if(finalCheckValid) {
// updatedSession = updatedSession.copyWith(step: 7, details: 'Found Final Check', optional: optionalStr, finalCheck: finalCheckStr);
// }else{
// log("final check not valid ==> ${updatedSession.getFinalCheckValue} ${finalCheckStr}");
// }
//
// }
// }
// }
// }
// }
// }
// log("${updatedSession.step} ${updatedSession.logDetails??''}");
return updatedSession;
} catch (e) {
if (e is Error) {
log("$e\n${e.stackTrace}");
}
rethrow;
}
}
