I'm working (actually more like playing) around with the Bit.ly API, and keep getting the error in the title of this question. So I'm going to show you the code and hopefuly someone can help me resolve this. First the client side code.
var x = service.GetClicks(url, service.BitlyLogin, service.BitlyAPIKey);
Console.WriteLine(x);
Console.ReadLine();
And this is the code that's being called
public List<int> GetClicks(string url, string login, string key)
{
List<int> clicks = new List<int>();
url = Uri.EscapeUriString(url);
string reqUri =
String.Format("http://api.bit.ly/v3/clicks?" +
"login={0}&apiKey={1}&shortUrl={2}&format=xml" +
login, key, url);
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(reqUri);
req.Timeout = 10000; // 10 seconds
Stream stm = req.GetResponse().GetResponseStream();
XmlDocument doc = new XmlDocument();
doc.Load(stm);
// error checking for xml
if (doc["response"]["status_code"].InnerText != "200")
throw new WebException(doc["response"]["status_txt"].InnerText);
XmlElement el = doc["response"]["data"]["clicks"];
clicks.Add(int.Parse(el["global_clicks"].InnerText));
clicks.Add(int.Parse(el["user_clicks"].InnerText));
return clicks;
}
As you can see it's very simple code, nothing complicated, and I can see nothing that causes this error. Anyone out there who has worked with(the full error is Index (zero based) must be greater than or equal to zero and less than the size of the argument list.) the Bit.ly API and can lend a hand?
Instead this
string reqUri =
String.Format("http://api.bit.ly/v3/clicks?" +
"login={0}&apiKey={1}&shortUrl={2}&format=xml" + login, key, url);
Use this
string reqUri = String.Format("http://api.bit.ly/v3/clicks?login={0}&apiKey={1}&shortUrl={2}&format=xml", login, key, url);
Notice that I just changed the plus sign with the comma before "login, key, url);" at the end of the String.Format().
I narrowed it down to a place where I was using string.Format to build an array and has less in the string.Format than what was supposed to. I had it go to Index 3 but only filled to Index 2
Not for your specific case, but I ran into this: make sure that, if you have multiple parameters, you send them as an array of objects instead of an IEnumerable:
IEnumerable<object> myArgs = ...;
string toFormat = "{0} xyz {1}";
String.Format(toFormat, myArgs);
// ERROR, since myArgs is one argument whereas the string template requires two
String.Format(toFormat, myArgs.ToArray());
// Valid, as the Format() accepts an array of objects to fill all arguments in the string
Related
I prepared this small example to show you my problem (vb.net and Newtonsoft)
I would prefer that the solution be done with Newtonsoft.
Public Class Message
Property Emoji As String
End Class
Public Sub GetJson()
Dim msgObject As New Message With {.Emoji = "\uD83D\uDE00"}
'Option 1
Dim JsonSerializerSettings As New JsonSerializerSettings
JsonSerializerSettings.StringEscapeHandling = StringEscapeHandling.EscapeNonAscii
Dim msgJson_1 As String = Newtonsoft.Json.JsonConvert.SerializeObject(msgObject, JsonSerializerSettings)
'Option 2
Dim msgJson_2 As String = Newtonsoft.Json.JsonConvert.SerializeObject(msgObject, Newtonsoft.Json.Formatting.None)
'Option 3
Dim stringWriter As New StringWriter()
Using writer As New JsonTextWriter(stringWriter)
writer.Formatting = Formatting.None
Dim serializer As New JsonSerializer()
serializer.Serialize(writer, msgObject)
End Using
Dim msgJson_3 As String = stringWriter.ToString()
End Sub
with none of the three options works, it always results in
{
"Emoji": "\\uD83D\\uDE00"
}
The result I need is
{
"Emoji": "\uD83D\uDE00"
}
How do I set Newtonsoft to not take into account the backslash character, as an escaped character?
Another unorthodox way could be:
jsonString = jsonString.replace("\\","\")
I do not really like
Thanks!!!!
\ is an escape char in JSON hence if you try and serialise a \ it gets escaped as \\ then when you deserialise \\ you get \
My guess is you have been given an example asking you to send "Emoji": "\uD83D\uDE00"
In json (and C#) \u#### specifies a unicode character (usually for something not found on a keyboard) as you are using VB.NET instead you should use $"{ChrW(&HD83D)}{ChrW(&HDE00)}"
"jsonString = jsonString.replace("//","/") " will never work, this is more safe way
json = json.Replace("\\\\u","\\u");
or since you don't like old, good classical solutions
json = Regex.Replace(json, #"\\u", #"u");
//or
json = json.Replace(#"\\u", #"\u");
even this will work in your case ( but I will not recommend for another cases since it is not safe)
json = Regex.Unescape(json);
This is the response I'm getting: The request signature we calculated does not match the signature you provided.
Here is the code I'm using to generate the signature:
static byte[] HmacSHA256(String data, byte[] key)
{
String algorithm = "HmacSHA256";
KeyedHashAlgorithm kha = KeyedHashAlgorithm.Create(algorithm);
kha.Key = key;
return kha.ComputeHash(Encoding.UTF8.GetBytes(data));
}
static byte[] getSignatureKey(String key, String dateStamp, String regionName, String serviceName)
{
byte[] kSecret = Encoding.UTF8.GetBytes(("AWS4" + key).ToCharArray());
byte[] kDate = HmacSHA256(dateStamp, kSecret);
byte[] kRegion = HmacSHA256(regionName, kDate);
byte[] kService = HmacSHA256(serviceName, kRegion);
byte[] kSigning = HmacSHA256("aws4_request", kService);
return kSigning;
}
When I use Amazon's test settings, I get the correct signature
key = 'wJalrXUtnFEMI/K7MDENG+bPxRfiCYEXAMPLEKEY'
dateStamp = '20120215'
regionName = 'us-east-1'
serviceName = 'iam'
However, when I put my live settings in, I get the not matching error.
Here is what I'm using to get my signature:
var reqSig = getSignatureKey("[my secret key]", dateStamp, "us-west-2","AWSECommerceService");
This is what I'm submitting (I'm just testing it in a browser, for now):
ecs.amazonaws.com/onca/xml?Service=AWSECommerceService&AWSAccessKeyId=[my
access key that corresponds with the secret
key]&Operation=ItemLookup&IdType=UPC&ItemId=635753490879&Timestamp=2019-01-24T19:14:55.2644840Z&Signature=32BA07ECE67F3177BF2EA02923E624D612A45FAA144ED0E43BDDC0DF6574EAC3
I'm not sure if it has to do with the region -- us-west-2 in my case -- because there is no place on the request for a region. I'm not sure how Amazon can test my signature against my parameters if I can't specify what region it is and I've used the region to calculate the signature.
What am I missing?
Ok. After spending days going through this, here is what I had to do:
/*
DOCUMENTATION: https://docs.aws.amazon.com/AWSECommerceService/latest/DG/rest-signature.html#rest_detailedexample
*/
var itemID = "0679722769";
var accessKeyID = "AKIAIOSFODNN7EXAMPLE";
var timeStamp = DateTime.UtcNow.ToString("o");
var req = $"Service=AWSECommerceService&AWSAccessKeyId={accessKeyID}&Operation=ItemLookup&IdType=UPC&ItemId={itemID}&Version=2013-08-01&Timestamp={timeStamp}";
req = req.Replace(":", "%3A").Replace(",", "%2C"); //UrlDecode certain characters
var reqlist = req.Split('&').ToArray(); //we need to sort our key/value pairs
Array.Sort(reqlist);
req = String.Join("&", reqlist); //join everything back
var reqToSign = $#"GET
webservices.amazon.com
/onca/xml
{req}".Replace("\r", ""); //create the request for signing. We need to replace microsofts's crlf with just a lf; Make sure there are no leading spaces after the linefeeds.
var signage = getSignatureKey("1234567890",reqToSign);
req = $"http://webservices.amazon.com/onca/xml?{req}&Signature={signage}"; //create our request with the signature appended.
return req;
}
private static byte[] HmacSHA256(String data, byte[] key)
{
String algorithm = "HmacSHA256";
KeyedHashAlgorithm kha = KeyedHashAlgorithm.Create(algorithm);
kha.Key = key;
return kha.ComputeHash(Encoding.UTF8.GetBytes(data));
}
private static string getSignatureKey(string key, string stringToSign)
{
byte[] kSecret = Encoding.UTF8.GetBytes(key.ToCharArray());
byte[] kSigning = HmacSHA256(stringToSign, kSecret);
return WebUtility.UrlEncode(Convert.ToBase64String(kSigning));
}
Contrary to most of the answers found here and elsewhere, this is the only way that works. The entire request has to be hashed, not just particular parameters. I can't speak to other Amazon services, but the Commerce Service has to be done like this.
Quite a few answers referenced this: https://docs.aws.amazon.com/general/latest/gr/sigv4-calculate-signature.html or this: Amazon API generating a request signature in C# .NET
As I stated in my question, this is most certainly not correct. If you're not passing a region parameter, how can Amazon create the same signature since it doesn't have all the information.
Anyway, this works now.
I'm trying to pass a string with special characters to your web api but is giving error.
Below the line where I pass the values pro web api:
string listaParcelaSeparadoVirgula = null;
foreach (var item in listaParcelas)
{
listaParcelaSeparadoVirgula = listaParcelaSeparadoVirgula + ";;" + item;
}
var result = HttpUtility.UrlEncode(listaParcelaSeparadoVirgula);
var response = client.PostAsJsonAsync("api/LancamentoReceitaDespesa/AddLancamentoParcelar/" + result, lancamentoReceitaDespesa).Result;
the result is a string variable with values separated by ";;". Below the contents of the string:
";;aaaaa 1/2||10/01/2014|100,00||;;aaaaa 2/2||10/02/2014|100,00||"
with UrlEncode:
"%3b%3baaaaa+1%2f2%7c%7c10%2f01%2f2014%7c100%2c00%7c%7c%3b%3baaaaa+2%2f2%7c%7c10%2f02%2f2014%7c100%2c00%7c%7c"
Error:
{"Error while copying content to a stream."}
How can I pass these values pro web api?
Well you could try encode value with base64 since in url you could have special symbols
var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(result);
var response = client.PostAsJsonAsync("api/LancamentoReceitaDespesa/AddLancamentoParcelar/" + System.Convert.ToBase64String(plainTextBytes), lancamentoReceitaDespesa).Result;
then in web
public void AddLancamentoParcelar(string base64EncodedData) {
var base64EncodedBytes = System.Convert.FromBase64String(base64EncodedData);
var result = System.Text.Encoding.UTF8.GetString(base64EncodedBytes);
}
I am not sure if its the best solution but as you could have any symbol in url then its could be an solution.
I'm using node js 0.10.12 to perform querys to postgreSQL 9.1.
I get the error error invalid input synatx for integer: "{39}" (39 is an example number) when I try to perform an update query
I cannot see what is going wrong. Any advise?
Here is my code (snippets) in the front-end
//this is global
var gid=0;
//set websockets to search - works fine
var sd = new WebSocket("ws://localhost:0000");
sd.onmessage = function (evt)
{
//get data, parse it, because there is more than one vars, pass id to gid
var received_msg = evt.data;
var packet = JSON.parse(received_msg);
var tid = packet['tid'];
gid=tid;
}
//when user clicks button, set websockets to send id and other data, to perform update query
var sa = new WebSocket("ws://localhost:0000");
sa.onopen = function(){
sa.send(JSON.stringify({
command:'typesave',
indi:gid,
name:document.getElementById("typename").value,
}));
sa.onmessage = function (evt) {
alert("Saved");
sa.close;
gid=0;//make gid 0 again, for re-use
}
And the back -end (query)
var query=client.query("UPDATE type SET t_name=$1,t_color=$2 WHERE t_id = $3 ",[name, color, indi])
query.on("row", function (row, result) {
result.addRow(row);
});
query.on("end", function (result) {
connection.send("o");
client.end();
});
Why this not work and the number does not get recognized?
Thanks in advance
As one would expect from the initial problem, your database driver is sending in an integer array of one member into a field for an integer. PostgreSQL rightly rejects the data and return an error. '{39}' in PostgreSQL terms is exactly equivalent to ARRAY[39] using an array constructor and [39] in JSON.
Now, obviously you can just change your query call to pull the first item out of the JSON array. and send that instead of the whole array, but I would be worried about what happens if things change and you get multiple values. You may want to look at separating that logic out for this data structure.
I am currently trying to retrieve a unique device identifier. Here is my code:
var token = Windows.System.Profile.HardwareIdentification.getPackageSpecificToken(null);
var reader = Windows.Storage.Streams.DataReader.fromBuffer(token.id);
reader.unicodeEncoding = true;
var identifier = reader.readString(reader.unconsumedBufferLength);
console.log(identifier);
But it raises following error:
The operation attempted to access data outside the valid range.
How can I retrieve the size of my token.id string? I also tried to use token.id.length, but result is the same.
I can't try to replicate what you're doing at the moment, but you might try reading it as bytes into array like this:
var array = new Array(token.id.length);
reader.readBytes(array);
And then convert the array to a string for the identifier.
See these posts for examples:
http://social.msdn.microsoft.com/Forums/en-US/winappswithhtml5/thread/1e2175e3-fe07-4094-9454-b3ecf1bf0381
http://social.msdn.microsoft.com/Forums/en-US/winappswithhtml5/thread/cdf72b9f-b3c0-488e-b607-b4445a5039b3