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Generating pre-signed Url in .Net for AWS s3

Based on the documentation, with provided sample data, it should be possible to generate a signed key with value of:
aeeed9bbccd4d02ee5c0109b86d86835f995330da4c265957d157751f604d404
Here is my code in .Net:
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
namespace PlayingWithAmazonS3
{
public class ReadTextFilePerRest
{
private string _regionSample = "us-east-1";
private string _dateSample = "20130524";
private string _secretAccessKeySample = "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY";
private string _canonicalRequestPath = "..\\Files\\SampleFiles\\CanonicalRequest.txt";
private string _stringToSignPath = "..\\Files\\SampleFiles\\StringToSign.txt";
private string _canonicalRequest;
private string _stringToSign;
public void ReadPayloadFiles()
{
_stringToSign = File.ReadAllText(_stringToSignPath);
_canonicalRequest = File.ReadAllText(_canonicalRequestPath);
}
// it needs to return: aeeed9bbccd4d02ee5c0109b86d86835f995330da4c265957d157751f604d404
public string SigningKey()
{
var keyBytes = Encoding.ASCII.GetBytes("AWS4" + _secretAccessKeySample);
var dateBytes = Encoding.ASCII.GetBytes(_dateSample);
var regionBytes = Encoding.ASCII.GetBytes(_regionSample);
var serviceBytes = Encoding.ASCII.GetBytes("s3");
var requestBytes = Encoding.ASCII.GetBytes("aws4_request");
var stringToSignBytes = Encoding.ASCII.GetBytes(_stringToSign);
using (HMACSHA256 hmac = new HMACSHA256(dateBytes))
{
var dateKey = hmac.ComputeHash(keyBytes);
using (HMACSHA256 hmac2 = new HMACSHA256(regionBytes))
{
var dateRegionKey = hmac2.ComputeHash(dateKey);
using (HMACSHA256 hmac3 = new HMACSHA256(serviceBytes))
{
var dateRegionServiceKey = hmac3.ComputeHash(dateRegionKey);
using (HMACSHA256 hmac4 = new HMACSHA256(requestBytes))
{
var signingKey = hmac4.ComputeHash(dateRegionServiceKey);
using (HMACSHA256 hmac5 = new HMACSHA256(stringToSignBytes))
{
var signature = hmac5.ComputeHash(signingKey);
return ByteToString(signature);
}
}
}
}
}
}
private string ByteToString(IEnumerable<byte> buffer)
{
var sBinary = buffer.Aggregate("", (current, buff) => current + buff.ToString("X2"));
return sBinary;
}
}
}
However, my generated signed key is different. Can anybody tell me where is my mistake?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
namespace PlayingWithAmazonS3
{
/// <summary>
/// this class is only responsible for calculating the final signature for creating a pre-signed Url to
/// communicate through REST with iam service
/// </summary>
public class PreSignedUrlRestSignatureCal
{
private const string RegionSample = "us-east-1";
private const string DateSample = "20150830";
private const string ServiceSample = "iam";
// it is provided as an example by AWS
private const string SecretAccessKeySample = "wJalrXUtnFEMI/K7MDENG+bPxRfiCYEXAMPLEKEY";
/// <summary>
/// this method will be called in main
/// </summary>
public void ExecuteMethod()
{
var finalSignature = SigningKey();
Console.WriteLine("Final Signature: " + finalSignature);
}
private string SigningKey()
{
// generating derived signing key
var derivedSigningKey =
GetSignatureKey(SecretAccessKeySample, DateSample, RegionSample, ServiceSample);
// example signingKey provided by aws for test
var stringToSign = "AWS4-HMAC-SHA256" + "\n" +
"20150830T123600Z" + "\n" +
"20150830/us-east-1/iam/aws4_request" + "\n" +
"f536975d06c0309214f805bb90ccff089219ecd68b2577efef23edd43b7e1a59";
// generating the final signature
var signature = HmacSha256(stringToSign, derivedSigningKey);
// returning the hex value of the final signature
return ByteToString(signature);
}
/// <summary>
/// calculating hmac-sha256 in .Net
/// </summary>
/// <param name="data"></param>
/// <param name="key"></param>
/// <returns></returns>
private byte[] HmacSha256(string data, byte[] key)
{
const string algorithm = "HmacSHA256";
var kha = KeyedHashAlgorithm.Create(algorithm);
kha.Key = key;
return kha.ComputeHash(Encoding.UTF8.GetBytes(data));
}
/// <summary>
/// get derived signing key (not the final signature) from provided info
/// </summary>
/// <param name="key"></param>
/// <param name="dateStamp"></param>
/// <param name="regionName"></param>
/// <param name="serviceName"></param>
/// <returns></returns>
private byte[] GetSignatureKey(string key, string dateStamp, string regionName, string serviceName)
{
var kSecret = Encoding.UTF8.GetBytes(("AWS4" + key).ToCharArray());
var kDate = HmacSha256(dateStamp, kSecret);
var kRegion = HmacSha256(regionName, kDate);
var kService = HmacSha256(serviceName, kRegion);
var kSigning = HmacSha256("aws4_request", kService);
return kSigning;
}
/// <summary>
/// it returns the hex value of byte[]
/// </summary>
/// <param name="buffer"></param>
/// <returns></returns>
private string ByteToString(IEnumerable<byte> buffer)
{
var sBinary = buffer.Aggregate("", (current, buff) => current + buff.ToString("X2"));
return sBinary.ToLower();
}
}
}

C# - Odd Null Reference Exception during testing, why does this happen?

This references my last question which appears to have been abandoned. I am experiencing an odd "bug" if you will with C# and MS VS 2015. To reproduce the error, follow the steps:
Open console app project and copy paste code below.
Set a break point here:
First run code past break point, it works! :D
Then run code again but this time STOP at the break point and DRAG the executing statement cursor INTO the if statement from here:
to here:
Hit Continue and an NRE exception is thrown. Why does this happen? Is it just me? What is the technical explination for this?
CODE:
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace testapp
{
class Program
{
static void Main(string[] args)
{
FILECollection randomCollection = new FILECollection();
// Fill with junk test data:
for(int i = 0; i<10; i++)
{
FILE junkfile = new FILE() { fileName = i.ToString(), folderName = i.ToString(), fileHashDigest = new byte[1] };
randomCollection.Add(junkfile);
}
if (true)
{
Console.WriteLine("testing this weird exception issue...");
FILE test;
test = new FILE();
test.fileName = "3";
test.folderName = "3";
test.fileHashDigest = new byte[1];
FILE exists = randomCollection.Where(f => f.fileName == test.fileName &&
f.fileHashDigest.SequenceEqual(test.fileHashDigest)).First();
}
}
}
public class FILE
{
public FILE() { _fileName = "";}
private string _fileName;
public string fileName
{
get
{
if (false)
return this._fileName.ToUpper();
else
return this._fileName;
}
set
{
if (false)
this._fileName = value.ToUpper();
else
this._fileName = value;
}
}
public string folderName { get; set; }
public byte[] fileHashDigest { get; set; }
}
public class FILECollection : IEnumerable<FILE>, ICollection<FILE>
{
private HashSet<FILE> svgHash;
private static List<FILE> PreallocationList;
public string FileName = "N/A";
/// <summary>
/// Default Constructor, will not
/// preallocate memory.
/// </summary>
/// <param name="PreallocationSize"></param>
public FILECollection()
{
this.svgHash = new HashSet<FILE>();
this.svgHash.Clear();
}
/// <summary>
/// Overload Constructor Preallocates
/// memory to be used for the new
/// FILE Collection.
/// </summary>
public FILECollection(int PreallocationSize, string fileName = "N/A", int fileHashDigestSize = 32)
{
FileName = fileName;
PreallocationList = new List<FILE>(PreallocationSize);
for (int i = 0; i <= PreallocationSize; i++)
{
byte[] buffer = new byte[fileHashDigestSize];
FILE preallocationSVG = new FILE()
{
fileName = "",
folderName = "",
fileHashDigest = buffer
};
PreallocationList.Add(preallocationSVG);
}
this.svgHash = new HashSet<FILE>(PreallocationList);
this.svgHash.Clear(); // Capacity remains unchanged until a call to TrimExcess is made.
}
/// <summary>
/// Add an FILE file to
/// the FILE Collection.
/// </summary>
/// <param name="svg"></param>
public void Add(FILE svg)
{
this.svgHash.Add(svg);
}
/// <summary>
/// Removes all elements
/// from the FILE Collection
/// </summary>
public void Clear()
{
svgHash.Clear();
}
/// <summary>
/// Determine if the FILE collection
/// contains the EXACT FILE file, folder,
/// and byte[] sequence. This guarantees
/// that the collection contains the EXACT
/// file you are looking for.
/// </summary>
/// <param name="item"></param>
/// <returns></returns>
public bool Contains(FILE item)
{
return svgHash.Any(f => f.fileHashDigest.SequenceEqual(item.fileHashDigest) &&
f.fileName == item.fileName &&
f.folderName == item.folderName);
}
/// <summary>
/// Determine if the FILE collection
/// contains the same file and folder name,
/// byte[] sequence is not compared. The file and folder
/// name may be the same but this does not guarantee the
/// file contents are exactly the same. Use Contains() instead.
/// </summary>
/// <param name="item"></param>
/// <returns></returns>
public bool ContainsPartially(FILE item)
{
return svgHash.Any(f => f.fileName == item.fileName &&
f.folderName == item.folderName);
}
/// <summary>
/// Returns the total number
/// of FILE files in the Collection.
/// </summary>
public int Count
{ get { return svgHash.Count(); } }
public bool IsReadOnly
{ get { return true; } }
public void CopyTo(FILE[] array, int arrayIndex)
{
svgHash.CopyTo(array, arrayIndex);
}
public bool Remove(FILE item)
{
return svgHash.Remove(item);
}
public IEnumerator<FILE> GetEnumerator()
{
return svgHash.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return svgHash.GetEnumerator();
}
}
}
I think either I am debugging in a terribly wrong way, or Microsoft should take a look at this. It's like future code is breaking current code...which is impossible!

OK here's my best guess..
First, as I mentioned in the comments, the exception doesn't occur if you comment out the line FILE exists = randomCollection.Where(f => f.fileName == test.fileName && f.fileHashDigest.SequenceEqual(test.fileHashDigest)).First()‌​;
Second, I noticed the same behavior can be reproduced with the following code:
if (true)
{
object o;
o = new object();
Func<bool> m = () => o == null;
}
i.e. the cause seems to be related to the variable being used in a lambda expression. So, looking at the same code snippet above in ILSpy I get the following:
Program.<>c__DisplayClass0_0 <>c__DisplayClass0_ = new Program.<>c__DisplayClass0_0();
<>c__DisplayClass0_.o = new object();
Func<bool> func = new Func<bool>(<>c__DisplayClass0_.<Main>b__0);
so my best guess is that the NullReferenceException refers to <>c__DisplayClass0_ intance being null - and I'm therefore inclined to believe that the stepping through the if(true) actually skipped the first line where <>c__DisplayClass0_ is instantiated

If there are Int32[] properties in user.config, I get an invalid cast exception when I use my CustomSettingsProvider

I followed this article and I created my CustomSettingsProvider in order to get rid of the "_url_somehash" part of the path where the user.config file is stored. Now my settings are stored in <LocalApplicationData>\CompanyName\ProductName\Version\user.config as I wanted.
My user.config file (written by my application before creating my CustomSettingsProvider) contains one Int32[] property that was stored and loaded correctly by the default SettingsProvider. When I use my CustomSettingsProvider I get the following exception:
Exception InvalidCastException
Source = mscorlib
Message = Invalid cast from 'System.String' to 'System.Int32[]'.
TargetSite = System.Object DefaultToType(System.IConvertible, System.Type, System.IFormatProvider)
Stack =
System.Convert.DefaultToType(IConvertible value, Type targetType, IFormatProvider provider)
System.String.System.IConvertible.ToType(Type type, IFormatProvider provider)
System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider)
System.Convert.ChangeType(Object value, Type conversionType)
MyApp.Interface.CustomSettingsProvider.GetPropertyValues(SettingsContext context, SettingsPropertyCollection collection) in d:\Users\angelo\Documents\Visual Studio 2013\Projects\MyApp\MyApp\Interface\CustomSettingsProvider.cs:line 112
System.Configuration.SettingsBase.GetPropertiesFromProvider(SettingsProvider provider)
System.Configuration.SettingsBase.GetPropertyValueByName(String propertyName)
System.Configuration.SettingsBase.get_Item(String propertyName)
System.Configuration.ApplicationSettingsBase.GetPropertyValue(String propertyName)
System.Configuration.ApplicationSettingsBase.get_Item(String propertyName)
MyApp.Properties.Settings.get_UpgradeRequired() in d:\Users\angelo\Documents\Visual Studio 2013\Projects\MyApp\MyApp\Properties\Settings.Designer.cs:line 31
MyApp.Interface.Program.Run() in d:\Users\angelo\Documents\Visual Studio 2013\Projects\MyApp\MyApp\Interface\Program.cs:line 51
MyApp.Interface.Program.Main() in d:\Users\angelo\Documents\Visual Studio 2013\Projects\MyApp\MyApp\Interface\Program.cs:line 34
How can I fix this problem? In a more general way, how can I store collections and classes in the same way I can do it with the default SettingsProvider?
This is the full code of my CustomSettingsProvider class:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration;
using System.Reflection;
using System.Xml.Linq;
using System.IO;
// ==>>>> https://stackoverflow.com/questions/2265271/custom-path-of-the-user-config
// https://stackoverflow.com/questions/1947185/c-sharp-get-special-folder
namespace MyApp.Interface
{
class CustomSettingsProvider : SettingsProvider
{
#region Helper struct
/// <summary>
/// Helper struct.
/// </summary>
internal struct SettingStruct
{
internal string name;
internal string serializeAs;
internal string value;
}
#endregion
#region Constants
const string NAME = "name";
const string SERIALIZE_AS = "serializeAs";
const string CONFIG = "configuration";
const string USER_SETTINGS = "userSettings";
const string SETTING = "setting";
#endregion
#region Fields
bool _loaded;
#endregion
#region Properties
/// <summary>
/// Override.
/// </summary>
public override string ApplicationName { get { return System.Reflection.Assembly.GetExecutingAssembly().ManifestModule.Name; } set { /*do nothing*/ } }
/// <summary>
/// The setting key this is returning must set before the settings are used.
/// e.g. <c>Properties.Settings.Default.SettingsKey = #"C:\temp\user.config";</c>
/// </summary>
private string UserConfigPath
{
get
{
System.Diagnostics.FileVersionInfo versionInfo;
string strUserConfigPath, strUserConfigFolder;
strUserConfigPath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData, Environment.SpecialFolderOption.Create);
versionInfo = System.Diagnostics.FileVersionInfo.GetVersionInfo(Assembly.GetEntryAssembly().Location);
strUserConfigPath = Path.Combine(strUserConfigPath, versionInfo.CompanyName, versionInfo.ProductName, versionInfo.ProductVersion, "user.config");
strUserConfigFolder = Path.GetDirectoryName(strUserConfigPath);
if(!Directory.Exists(strUserConfigFolder))
Directory.CreateDirectory(strUserConfigFolder);
return strUserConfigPath;
}
}
/// <summary>
/// In memory storage of the settings values
/// </summary>
private Dictionary<string, SettingStruct> SettingsDictionary { get; set; }
#endregion
#region Constructor
/// <summary>
/// Loads the file into memory.
/// </summary>
public CustomSettingsProvider()
{
SettingsDictionary = new Dictionary<string, SettingStruct>();
}
/// <summary>
/// Override.
/// </summary>
public override void Initialize(string name, System.Collections.Specialized.NameValueCollection config)
{
base.Initialize(ApplicationName, config);
}
#endregion
/// <summary>
/// Must override this, this is the bit that matches up the designer properties to the dictionary values
/// </summary>
/// <param name="context"></param>
/// <param name="collection"></param>
/// <returns></returns>
public override SettingsPropertyValueCollection GetPropertyValues(SettingsContext context, SettingsPropertyCollection collection)
{
//load the file
if(!_loaded)
{
_loaded = true;
LoadValuesFromFile();
}
//collection that will be returned.
SettingsPropertyValueCollection values = new SettingsPropertyValueCollection();
//iterate thought the properties we get from the designer, checking to see if the setting is in the dictionary
foreach(SettingsProperty setting in collection)
{
SettingsPropertyValue value = new SettingsPropertyValue(setting);
value.IsDirty = false;
//need the type of the value for the strong typing
var t = Type.GetType(setting.PropertyType.FullName);
if(SettingsDictionary.ContainsKey(setting.Name))
{
value.SerializedValue = SettingsDictionary[setting.Name].value;
value.PropertyValue = Convert.ChangeType(SettingsDictionary[setting.Name].value, t);
}
else //use defaults in the case where there are no settings yet
{
value.SerializedValue = setting.DefaultValue;
value.PropertyValue = Convert.ChangeType(setting.DefaultValue, t);
}
values.Add(value);
}
return values;
}
/// <summary>
/// Must override this, this is the bit that does the saving to file. Called when Settings.Save() is called
/// </summary>
/// <param name="context"></param>
/// <param name="collection"></param>
public override void SetPropertyValues(SettingsContext context, SettingsPropertyValueCollection collection)
{
//grab the values from the collection parameter and update the values in our dictionary.
foreach(SettingsPropertyValue value in collection)
{
var setting = new SettingStruct()
{
value = (value.PropertyValue == null ? String.Empty : value.PropertyValue.ToString()),
name = value.Name,
serializeAs = value.Property.SerializeAs.ToString()
};
if(!SettingsDictionary.ContainsKey(value.Name))
SettingsDictionary.Add(value.Name, setting);
else
SettingsDictionary[value.Name] = setting;
}
//now that our local dictionary is up-to-date, save it to disk.
SaveValuesToFile();
}
/// <summary>
/// Loads the values of the file into memory.
/// </summary>
private void LoadValuesFromFile()
{
string strUserConfigPath;
strUserConfigPath = UserConfigPath;
//if the config file is not where it's supposed to be create a new one.
if(!File.Exists(strUserConfigPath))
CreateEmptyConfig(strUserConfigPath);
//System.Security.Policy.StrongName strongName = new System.Security.Policy.StrongName(
//ClickOnce
//load the xml
var configXml = XDocument.Load(UserConfigPath);
//get all of the <setting name="..." serializeAs="..."> elements.
var settingElements = configXml.Element(CONFIG).Element(USER_SETTINGS).Element(typeof(Properties.Settings).FullName).Elements(SETTING);
//iterate through, adding them to the dictionary, (checking for nulls, xml no likey nulls)
//using "String" as default serializeAs...just in case, no real good reason.
foreach(var element in settingElements)
{
var newSetting = new SettingStruct()
{
name = element.Attribute(NAME) == null ? String.Empty : element.Attribute(NAME).Value,
serializeAs = element.Attribute(SERIALIZE_AS) == null ? "String" : element.Attribute(SERIALIZE_AS).Value,
value = element.Value ?? String.Empty
};
SettingsDictionary.Add(element.Attribute(NAME).Value, newSetting);
}
}
/// <summary>
/// Creates an empty user.config file...looks like the one MS creates.
/// This could be overkill a simple key/value pairing would probably do.
/// </summary>
private void CreateEmptyConfig(string strUserConfigPath)
{
Configuration config1;
config1 = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.PerUserRoamingAndLocal);
if(File.Exists(config1.FilePath))
{
File.Copy(config1.FilePath, strUserConfigPath);
}
else
{
string s = Properties.Settings.Default.LastLoadedImage;
var doc = new XDocument();
var declaration = new XDeclaration("1.0", "utf-8", "true");
var config = new XElement(CONFIG);
var userSettings = new XElement(USER_SETTINGS);
var group = new XElement(typeof(Properties.Settings).FullName);
userSettings.Add(group);
config.Add(userSettings);
doc.Add(config);
doc.Declaration = declaration;
doc.Save(strUserConfigPath);
}
}
/// <summary>
/// Saves the in memory dictionary to the user config file
/// </summary>
private void SaveValuesToFile()
{
//load the current xml from the file.
var import = XDocument.Load(UserConfigPath);
//get the settings group (e.g. <Company.Project.Desktop.Settings>)
var settingsSection = import.Element(CONFIG).Element(USER_SETTINGS).Element(typeof(Properties.Settings).FullName);
//iterate though the dictionary, either updating the value or adding the new setting.
foreach(var entry in SettingsDictionary)
{
var setting = settingsSection.Elements().FirstOrDefault(e => e.Attribute(NAME).Value == entry.Key);
if(setting == null) //this can happen if a new setting is added via the .settings designer.
{
var newSetting = new XElement(SETTING);
newSetting.Add(new XAttribute(NAME, entry.Value.name));
newSetting.Add(new XAttribute(SERIALIZE_AS, entry.Value.serializeAs));
newSetting.Value = (entry.Value.value ?? String.Empty);
settingsSection.Add(newSetting);
}
else //update the value if it exists.
{
setting.Value = (entry.Value.value ?? String.Empty);
}
}
import.Save(UserConfigPath);
}
#region Angelo
private object GetDefaultValue(SettingsProperty setting)
{
if (setting.PropertyType.IsEnum)
return Enum.Parse(setting.PropertyType, setting.DefaultValue.ToString());
// Return the default value if it is set
// Return the default value if it is set
if (setting.DefaultValue != null)
{
System.ComponentModel.TypeConverter tc = System.ComponentModel.TypeDescriptor.GetConverter(setting.PropertyType);
return tc.ConvertFromString(setting.DefaultValue.ToString());
}
else // If there is no default value return the default object
{
return Activator.CreateInstance(setting.PropertyType);
}
}
#endregion
}
}

To read properties that are serialized as XML, you first need to deserialize them.
Probably the easiest way is to add a new method called something like getPropertyValue, which determines whether it should return the string value directly or deserialize it first. Then, in your code shown below, you can just call this method instead of using Convert.ChangeType to set property values:
var t = Type.GetType(setting.PropertyType.FullName);
if (SettingsDictionary.ContainsKey(setting.Name))
{
value.SerializedValue = SettingsDictionary[setting.Name].value;
// value.PropertyValue = Convert.ChangeType(SettingsDictionary[setting.Name].value, t);
value.PropertyValue = getPropertyValue(SettingsDictionary[setting.Name].value, t, setting.SerializeAs);
}
else //use defaults in the case where there are no settings yet
{
value.SerializedValue = setting.DefaultValue;
// value.PropertyValue = Convert.ChangeType(setting.DefaultValue, t);
value.PropertyValue = getPropertyValue((string)setting.DefaultValue, t, setting.SerializeAs);
}
An example of how your new method getPropertyValue might work:
private object getPropertyValue(string settingValue, Type settingType, SettingsSerializeAs serializeAs)
{
switch (serializeAs)
{
case SettingsSerializeAs.String:
return settingValue;
case SettingsSerializeAs.Xml:
//for demo purposes, assumes this is your int array--otherwise do further checking to get the correct type
XmlSerializer serializer = new XmlSerializer(typeof(int[]));
return serializer.Deserialize(new StringReader(settingValue));
//implement further types as required
default:
throw new NotImplementedException(string.Format("Settings deserialization as {0} is not implemented", serializeAs));
}
}
This will resolve the invalid cast error and load your array of integers into the setting.
You'll need to apply the corresponding treatment when you save the settings. If you hit complications with that, I suggest you post a new question as the issues are somewhat different.

C# & ASP.NET - Anyone create a library to talk to EdgeCast CDN via FTP?

For one of my projects we utilize a Content Delivery Network (EdgeCast) and I was wondering if anyone knew of an existing (open source) library for C# that we could leverage? In a nutshell, I am investigating the ability to create directories, upload files, and allow some general maintenance (rename files, delete files) via our admin panel. Any insight would be appreciated.
NOTE: My code to do this. I don't know if they have an updated API at this point so please check. This code is circa 2009 (as-is, no warranties, use at your own risk, etc).
EdgeCast.cs
using System;
using edgeCastWS = [DOMAIN].com.edgecast.api.EdgeCastWebServices;
namespace [DOMAIN].IO.ContentDeliveryNetwork
{
/// <summary>
/// <b>Authentication</b>
/// <para>Each web service call will include a string parameter called strCredential which will ensure that customers may only access data related to their own accounts. This credential is a string made up of a few separate pieces of information.</para>
/// <para>A typical credential a customer would use may look like: “c:bas:user#email.com:password”</para>
/// <para> * The field format of this string is delimited with a colon “:” character.</para>
/// <para> * The first field is the type of client which is calling the web service. “c” represents an individual customer.</para>
/// <para> * The second field is the security type. “bas” represents Basic Authentication.</para>
/// <para> * With basic authentication the third field is the username which is usually in email address notation.</para>
/// <para> * With basic authentication the fourth field is the password associated with the user.</para>
/// <para>If the username and password are not valid, then the credential will prevent the specified function from proceeding. A SOAP exception will be generated and sent back to the client that called the function. The message contained in the exception will contain the string “Access Denied.”</para>
/// </summary>
public class EdgeCast : IDisposable
{
#region Declarations
[ThreadStatic]
private static EdgeCast _current;
private static EdgeCastCredential _credential = null;
private static string _customerID = string.Empty;
private static edgeCastWS _edgeCastWS = null;
#endregion
#region Constructor
public EdgeCast()
{
if (_current != null)
{
throw new InvalidOperationException("Only one ContentDeliveryNetwork may be created on a given thread.");
}
_current = this;
_edgeCastWS = new edgeCastWS();
ConstructCredentials();
_customerID = AppSettings.EdgeCast_CustomerID;
}
#endregion
#region API Methods
/// <summary>
/// Purges a file from all of the EdgeCast caching servers. This process may take a few minutes to fully complete.
/// </summary>
/// <param name="Path">This is path of the file or folder to purge, in URL format. To specify a folder, please put a trailing slash at the end of the URL. All files under that folder will be purged</param>
/// <param name="MediaType">HTTP Large Object = 3, HTTP Small Object = 8, Flash = 2, Windows = 1</param>
/// <returns>An integer that indicates whether or not the transaction was successful. 0 represents yes, -1 represents no</returns>
internal static short PurgeFileFromEdge(string Path, int MediaType)
{
return _edgeCastWS.PurgeFileFromEdge(_credential.Credential, _customerID, Path, MediaType);
}
/// <summary>
/// Loads a file to disk on all of the EdgeCast caching servers. This process may take a few minutes to fully complete.
/// </summary>
/// <param name="Path">This is path of the file to load, in URL format. Folders may not be loaded and will be ignored</param>
/// <param name="MediaType">HTTP Large Object = 3, HTTP Small Object = 8</param>
/// <returns>An integer that indicates whether or not the transaction was successful. 0 represents yes, -1 represents no</returns>
internal static short LoadFileToEdge(string Path, int MediaType)
{
return _edgeCastWS.LoadFileToEdge(_credential.Credential, _customerID, Path, MediaType);
}
/// <summary>
/// This method call is used to add a token authentication directory. All additions and changes should be processed every 30 minutes
/// </summary>
/// <param name="Dir">Directory Path should be starting from the root. Example: /directory1/directory2</param>
/// <param name="MediaType">Use 1 for Windows, 2 for Flash, 3 for HTTP Caching / Progressive download.</param>
/// <returns></returns>
internal static short TokenDirAdd(string Dir, int MediaType)
{
return _edgeCastWS.TokenDirAdd(_credential.Credential, _customerID, Dir, MediaType);
}
internal static string TokenEncrypt(string Key, string Args)
{
return _edgeCastWS.TokenEncrypt(_credential.Credential, Key, Args);
}
internal static short TokenKeyUpdate(string Key, int MediaType)
{
return _edgeCastWS.TokenKeyUpdate(_credential.Credential, _customerID, Key, MediaType);
}
#endregion
#region FTP Methods
/// <summary>
/// Does a FTP Upload of a file on the local system
/// </summary>
/// <param name="targetPath">The full path to save to on the FTP server (.\Campaigns\Prod\[Company GUID])</param>
/// <param name="sourceFileName">The full path and filename of the file to be uploaded (C:\[DOMAIN]\files\[filename])</param>
internal static void FTP_UploadFile(string targetPath, string sourceFileName)
{
string[] dirs = targetPath.Split(new char[] { '\\', '/' });
using (FTPFactory myFTP = new FTPFactory())
{
myFTP.login();
myFTP.setBinaryMode(true);
// Make sure the directories are there and change down to the bottom most directory...
foreach (string dirName in dirs)
{
bool dirExists = true;
try { myFTP.chdir(dirName); }
catch { dirExists = false; }
if (!dirExists)
{
myFTP.mkdir(dirName);
myFTP.chdir(dirName);
}
}
// upload the file now...
myFTP.upload(sourceFileName);
}
}
/// <summary>
/// Returns a string array of files in the target directory
/// </summary>
/// <param name="targetPath">The target directory</param>
/// <returns>string array or null if no files found</returns>
internal static string[] FTP_GetFileList(string targetPath)
{
string[] dirs = targetPath.Split(new char[] { '\\', '/' });
string[] files = null;
using (FTPFactory myFTP = new FTPFactory())
{
myFTP.login();
myFTP.setBinaryMode(true);
// Make sure the directories are there and change down to the bottom most directory...
foreach (string dirName in dirs)
{
bool dirExists = true;
try { myFTP.chdir(dirName); }
catch { dirExists = false; }
if (!dirExists)
{
myFTP.mkdir(dirName);
myFTP.chdir(dirName);
}
}
// get the list of files now...
files = myFTP.getFileList("*.*");
}
return files;
}
/// <summary>
/// Checks to see if a file exists
/// </summary>
/// <param name="targetPath">The CDN directory path to look in</param>
/// <param name="targetFile">The file to look for</param>
/// <returns>true = found, false = not found</returns>
internal static bool FTP_DoesFileExist(string targetPath, string targetFile)
{
bool retFlag = true;
string[] dirs = targetPath.Split(new char[] { '\\', '/' });
using (FTPFactory myFTP = new FTPFactory())
{
myFTP.login();
myFTP.setBinaryMode(true);
// change to the target directory - if it does not exists, neither does the file! simple...
foreach (string dirName in dirs)
{
try { myFTP.chdir(dirName); }
catch { retFlag = false; }
}
if (retFlag)
{
try { retFlag = myFTP.getFileSize(targetFile) > 0; }
catch { retFlag = false; }
}
}
return retFlag;
}
internal static bool FTP_DoesFileExist(string targetFile)
{
string targetPath = targetFile.Replace(#"http://", "");
targetPath = targetPath.Replace(#"https://", "");
targetPath = targetPath.Replace(#"cdn1.[DOMAIN].com/", "");
targetPath = targetPath.Replace(#"/", #"\");
targetPath = targetPath.Substring(0, targetPath.LastIndexOf(#"\"));
targetFile = targetFile.Substring(targetFile.LastIndexOf(#"/") + 1);
return FTP_DoesFileExist(targetPath, targetFile);
}
#endregion
#region Helper Methods
static private string ConstructCredentials()
{
_credential = new EdgeCastCredential();
return _credential.Credential;
}
static private string ConstructCredentials(string credentials)
{
_credential = new EdgeCastCredential(credentials);
return _credential.Credential;
}
static private string ConstructCredentials(string typeOfClient, string securityType, string userName, string password)
{
_credential = new EdgeCastCredential(typeOfClient, securityType, userName, password);
return _credential.Credential;
}
#endregion
#region IDisposable Members
public void Dispose()
{
_current = null;
}
#endregion
}
}
EdgeCastCredential.cs
using System;
using rivSecurity = [DOMAIN].Security.Cryptography.Internal;
namespace [DOMAIN].IO.ContentDeliveryNetwork
{
internal class EdgeCastCredential
{
#region Properties
public string TypeOfClient;
public string SecurityType;
public string UserName;
public string Password;
public string Credential { get { return String.Format("{0}:{1}:{2}:{3}", TypeOfClient, SecurityType, UserName, Password); } }
#endregion
#region Constructor
public EdgeCastCredential()
{
TypeOfClient = AppSettings.EdgeCast_TypeOfClient;
SecurityType = AppSettings.EdgeCast_SecurityType;
UserName = rivSecurity.Decrypt(AppSettings.EdgeCast_UserName);
Password = rivSecurity.Decrypt(AppSettings.EdgeCast_Password);
}
public EdgeCastCredential(string credentials)
{
string[] parts = credentials.Split(new char[] { ':' });
}
public EdgeCastCredential(string typeOfClient, string securityType, string userName, string password)
{
TypeOfClient = typeOfClient;
SecurityType = securityType;
UserName = userName;
Password = password;
}
#endregion
}
}

Never mind. I created a FTP library and used what little they had for an API. I can not now read/upload/delete files and purge the CDN.

How to change XML Attribute

How can I change an attribute of an element in an XML file, using C#?

Mike;
Everytime I need to modify an XML document I work it this way:
//Here is the variable with which you assign a new value to the attribute
string newValue = string.Empty;
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(xmlFile);
XmlNode node = xmlDoc.SelectSingleNode("Root/Node/Element");
node.Attributes[0].Value = newValue;
xmlDoc.Save(xmlFile);
//xmlFile is the path of your file to be modified
I hope you find it useful

Using LINQ to xml if you are using framework 3.5:
using System.Xml.Linq;
XDocument xmlFile = XDocument.Load("books.xml");
var query = from c in xmlFile.Elements("catalog").Elements("book")
select c;
foreach (XElement book in query)
{
book.Attribute("attr1").Value = "MyNewValue";
}
xmlFile.Save("books.xml");

If the attribute you want to change doesn't exist or has been accidentally removed, then an exception occurs. I suggest you first create a new attribute and send it to a function like the following:
private void SetAttrSafe(XmlNode node,params XmlAttribute[] attrList)
{
foreach (var attr in attrList)
{
if (node.Attributes[attr.Name] != null)
{
node.Attributes[attr.Name].Value = attr.Value;
}
else
{
node.Attributes.Append(attr);
}
}
}
Usage:
XmlAttribute attr = dom.CreateAttribute("name");
attr.Value = value;
SetAttrSafe(node, attr);

Here's the beginnings of a parser class to get you started. This ended up being my solution to a similar problem:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;
namespace XML
{
public class Parser
{
private string _FilePath = string.Empty;
private XDocument _XML_Doc = null;
public Parser(string filePath)
{
_FilePath = filePath;
_XML_Doc = XDocument.Load(_FilePath);
}
/// <summary>
/// Replaces values of all attributes of a given name (attributeName) with the specified new value (newValue) in all elements.
/// </summary>
/// <param name="attributeName"></param>
/// <param name="newValue"></param>
public void ReplaceAtrribute(string attributeName, string newValue)
{
ReplaceAtrribute(string.Empty, attributeName, new List<string> { }, newValue);
}
/// <summary>
/// Replaces values of all attributes of a given name (attributeName) with the specified new value (newValue) in elements with a given name (elementName).
/// </summary>
/// <param name="elementName"></param>
/// <param name="attributeName"></param>
/// <param name="newValue"></param>
public void ReplaceAtrribute(string elementName, string attributeName, string newValue)
{
ReplaceAtrribute(elementName, attributeName, new List<string> { }, newValue);
}
/// <summary>
/// Replaces values of all attributes of a given name (attributeName) and value (oldValue)
/// with the specified new value (newValue) in elements with a given name (elementName).
/// </summary>
/// <param name="elementName"></param>
/// <param name="attributeName"></param>
/// <param name="oldValue"></param>
/// <param name="newValue"></param>
public void ReplaceAtrribute(string elementName, string attributeName, string oldValue, string newValue)
{
ReplaceAtrribute(elementName, attributeName, new List<string> { oldValue }, newValue);
}
/// <summary>
/// Replaces values of all attributes of a given name (attributeName), which has one of a list of values (oldValues),
/// with the specified new value (newValue) in elements with a given name (elementName).
/// If oldValues is empty then oldValues will be ignored.
/// </summary>
/// <param name="elementName"></param>
/// <param name="attributeName"></param>
/// <param name="oldValues"></param>
/// <param name="newValue"></param>
public void ReplaceAtrribute(string elementName, string attributeName, List<string> oldValues, string newValue)
{
List<XElement> elements = _XML_Doc.Elements().Descendants().ToList();
foreach (XElement element in elements)
{
if (elementName == string.Empty | element.Name.LocalName.ToString() == elementName)
{
if (element.Attribute(attributeName) != null)
{
if (oldValues.Count == 0 || oldValues.Contains(element.Attribute(attributeName).Value))
{ element.Attribute(attributeName).Value = newValue; }
}
}
}
}
public void SaveChangesToFile()
{
_XML_Doc.Save(_FilePath);
}
}
}