public static FullStudent Map(BasicStudent basicStudent, string prevRecordHash, string currentNodeHash, string salt, int id = 1)
{
FullStudent fullStudent = new FullStudent
{
FirstName = basicStudent.FirstName,
MiddleName = basicStudent.MiddleName,
LastName = basicStudent.LastName,
DateOfBirth = basicStudent.DateOfBirth,
Organization = basicStudent.Organization,
SchoolDivision = basicStudent.SchoolDivision,
Degree = basicStudent.Degree,
Awarded = basicStudent.Awarded,
Major = basicStudent.Major,
RecordId = id,
PreviousRecordHash = prevRecordHash,
CurrentNodeHash = currentNodeHash,
Salt = salt
};
// set id,
// set previous recordhash
// set currentnodehash
return(fullStudent);
}
private static void InsertGenesisStudent(FullStudent fullStudent, IDatabaseConnector dbConnector)
{
// no record returned, add the genesis block
// generate previous node hash for genesis student
// generate genesis student hash, and salthash and combined hash
BasicStudent genesisStudent = StudentMapper.GenesisStudentNode();
// SHA512 hash of 512 for the previous for genesisStudent
string hashForGenesisStudentPrevious = Hash.GetHashString("Test");// Hash.GetBCryptHashAutoSalt("Test");
string genesisStudentSerialized = JsonConvert.SerializeObject(genesisStudent);
string genesisStudentHash = Hash.GetHashString(genesisStudentSerialized);
Console.WriteLine($"Genesis studnet");
Console.WriteLine(genesisStudentSerialized);
string[] genesissaltAndSaltHashArray = Hash.GetRandomSaltWithHash();
string genesissalt = genesissaltAndSaltHashArray[0];
string genesissaltHash = genesissaltAndSaltHashArray[1];
string genesisstudentHashPlusSaltHash = Hash.GetHashString(genesisStudentHash + genesissaltHash);
fullStudent = StudentMapper.Map(genesisStudent, hashForGenesisStudentPrevious, genesisstudentHashPlusSaltHash, genesissalt);
// add the full hash of the previous student
fullStudent.PreviousFullRecordHash = hashForGenesisStudentPrevious;
HttpStatusCode genesisrecordInsertedStatusCode = dbConnector.InsertStudentRecord(fullStudent);
}
public static BasicStudent FullStudentToBasicStudent(FullStudent fullStudent)
{
BasicStudent basicStudent = new BasicStudent()
{
FirstName = fullStudent.FirstName,
MiddleName = fullStudent.MiddleName,
LastName = fullStudent.LastName,
DateOfBirth = fullStudent.DateOfBirth,
Organization = fullStudent.Organization,
SchoolDivision = fullStudent.SchoolDivision,
Degree = fullStudent.Degree,
Awarded = fullStudent.Awarded,
Major = fullStudent.Major
};
return(basicStudent);
}
public static FullStudent DictionaryObjectToFullStudent(IDictionary <string, object> dict)
{
FullStudent fullStudent = new FullStudent()
{
FirstName = dict["FirstName"] as string,
MiddleName = dict["MiddleName"] as string,
LastName = dict["LastName"] as string,
DateOfBirth = (DateTime)dict["DateOfBirth"],
Organization = dict["Organization"] as string,
SchoolDivision = dict["SchoolDivision"] as string,
Degree = dict["Degree"] as string,
Awarded = (DateTime)dict["Awarded"],
Major = dict["Major"] as string,
PreviousRecordHash = dict["PreviousRecordHash"] as string,
CurrentNodeHash = dict["CurrentNodeHash"] as string,
Salt = dict["Salt"] as string,
IsValid = Convert.ToBoolean(dict["IsValid"]),
PreviousFullRecordHash = dict["PreviousFullRecordHash"] as string
};
return(fullStudent);
}
private async Task <HttpStatusCode> CreateStudentocumentIfNotExists(string databaseName, string collectionName, FullStudent student)
{
var response = await this.client.CreateDocumentAsync(UriFactory.CreateDocumentCollectionUri(databaseName, collectionName), student);
var statusCode = response.StatusCode;
return(statusCode);
}
public HttpStatusCode InsertStudentRecord(FullStudent student)
{
var response = this.CreateStudentocumentIfNotExists(PreviousDatabaseName, PreviousTableName, student).GetAwaiter().GetResult();
return(response);
}
public static async Task <HttpResponseMessage> Run(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
ILogger log)
{
log.LogInformation("C# HTTP trigger function processed a request.");
string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
BasicStudent studentToAdd = JsonConvert.DeserializeObject <BasicStudent>(requestBody);
// When returning, lets return the full student so that it may be tested further
var json = JsonConvert.SerializeObject(studentToAdd, Formatting.Indented);
var successMessageToReturn = new HttpResponseMessage(HttpStatusCode.Created)
{
Content = new StringContent(json, Encoding.UTF8, "application/json")
};
var failureMessageToReturn = new HttpResponseMessage(HttpStatusCode.NotFound);
var url = Environment.GetEnvironmentVariable("cosmosUrl");
var accessKey = Environment.GetEnvironmentVariable("cosmosAccesskey");
IDatabaseConnector dbConnector = new CosmosConnector(url, accessKey);
HttpStatusCode databaseCreatedSuccessfulyStatusCode = await dbConnector.CreateDataBase("StudentDatabase");
HttpStatusCode tableCreatedSuccessfullyStatusCode = await dbConnector.CreateTable(dbConnector.PreviousDatabaseName, "StudentRecords");
// last record holds the last inserted record
var lastRecord = await dbConnector.GetLastAddedStudentRecordByStudentId();
FullStudent fullStudentToAdd = null;
bool addingForFirstTime = false;
// if no record was retrieved (empty database, insert genesis block)
if (lastRecord.Count == 0)
{
InsertGenesisStudent(fullStudentToAdd, dbConnector);
addingForFirstTime = true;
}
if (addingForFirstTime)
{
// If we are adding for the first time, lets get the record of the last student added from the database
lastRecord = await dbConnector.GetLastAddedStudentRecordByStudentId();
}
string studentToAddSerialized = JsonConvert.SerializeObject(studentToAdd);
string studentToAddHash = Hash.GetHashString(studentToAddSerialized);
string[] saltAndSaltHashArray = Hash.GetRandomSaltWithHash();
string salt = saltAndSaltHashArray[0];
string saltHash = saltAndSaltHashArray[1];
string studentHashPlusSaltHash = Hash.GetHashString(studentToAddHash + saltHash);
dynamic previousRecord = lastRecord[0];
var dict = (IDictionary <string, object>)previousRecord;
string previousRecordHash = dict["CurrentNodeHash"] as string;
int previousRecordId = Convert.ToInt32(dict["RecordId"]);
fullStudentToAdd = StudentMapper.Map(studentToAdd, previousRecordHash, studentHashPlusSaltHash, salt, previousRecordId + 1);
//string previousstudentfullhash = dict["PreviousFullRecordHash"] as string;
// calculate out the full record hash of the previous full student
FullStudent previousFullStudent = StudentMapper.DictionaryObjectToFullStudent(dict);
string previousFullStudentSerialized = JsonConvert.SerializeObject(previousFullStudent);
Console.WriteLine(previousFullStudentSerialized);
string previousFullBCryptHash = Hash.GetHashString(previousFullStudentSerialized);//Hash.GetBCryptHashAutoSalt(previousFullStudentSerialized);
// save the full hash of the previous student
fullStudentToAdd.PreviousFullRecordHash = previousFullBCryptHash;
HttpStatusCode recordInsertedStatusCode = dbConnector.InsertStudentRecord(fullStudentToAdd);
if (recordInsertedStatusCode == HttpStatusCode.Created)
{
return(successMessageToReturn);
}
else
{
return(failureMessageToReturn);
}
}
