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);
}
}
