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Utils.cs

using System;
using System.IO;
using System.Collections;
using System.Text;
using System.Text.RegularExpressions;
using System.Xml.Serialization;

namespace FlickrNet
{
      /// <summary>
      /// Internal class providing certain utility functions to other classes.
      /// </summary>
00013       internal sealed class Utils
      {
            private static readonly DateTime unixStartDate = new DateTime(1970, 1, 1, 0, 0, 0);

            private Utils()
            {
            }

#if !WindowsCE
            internal static string UrlEncode(string oldString)
            {
                  if( oldString == null ) return null;

                  string a = System.Web.HttpUtility.UrlEncode(oldString);
                  a = a.Replace("&", "%26");
                  a = a.Replace("=", "%3D");
                  a = a.Replace(" ", "%20");
                  return a;
            }
#else
        internal static string UrlEncode(string oldString)
        {
            if (oldString == null) return String.Empty;
            StringBuilder sb = new StringBuilder(oldString.Length * 2);
            Regex reg = new Regex("[a-zA-Z0-9$-_.+!*'(),]");

            foreach (char c in oldString)
            {
                if (reg.IsMatch(c.ToString()))
                {
                    sb.Append(c);
                }
                else
                {
                    sb.Append(ToHex(c));
                }
            }
            return sb.ToString();
        }

        private static string ToHex(char c)
        {
            return ((int)c).ToString("X");
        }
#endif

            /// <summary>
            /// Converts a <see cref="DateTime"/> object into a unix timestamp number.
            /// </summary>
            /// <param name="date">The date to convert.</param>
            /// <returns>A long for the number of seconds since 1st January 1970, as per unix specification.</returns>
00064             internal static long DateToUnixTimestamp(DateTime date)
            {
                  TimeSpan ts = date - unixStartDate;
                  return (long)ts.TotalSeconds;
            }

            /// <summary>
            /// Converts a string, representing a unix timestamp number into a <see cref="DateTime"/> object.
            /// </summary>
            /// <param name="timestamp">The timestamp, as a string.</param>
            /// <returns>The <see cref="DateTime"/> object the time represents.</returns>
00075             internal static DateTime UnixTimestampToDate(string timestamp)
            {
                  if( timestamp == null || timestamp.Length == 0 ) return DateTime.MinValue;

                  return UnixTimestampToDate(long.Parse(timestamp));
            }

            /// <summary>
            /// Converts a <see cref="long"/>, representing a unix timestamp number into a <see cref="DateTime"/> object.
            /// </summary>
            /// <param name="timestamp">The unix timestamp.</param>
            /// <returns>The <see cref="DateTime"/> object the time represents.</returns>
00087             internal static DateTime UnixTimestampToDate(long timestamp)
            {
                  return unixStartDate.AddSeconds(timestamp);
            }

            /// <summary>
            /// Utility method to convert the <see cref="PhotoSearchExtras"/> enum to a string.
            /// </summary>
            /// <example>
            /// <code>
            ///     PhotoSearchExtras extras = PhotoSearchExtras.DateTaken &amp; PhotoSearchExtras.IconServer;
            ///     string val = Utils.ExtrasToString(extras);
            ///     Console.WriteLine(val);
            /// </code>
            /// outputs: "date_taken,icon_server";
            /// </example>
            /// <param name="extras"></param>
            /// <returns></returns>
00105             internal static string ExtrasToString(PhotoSearchExtras extras)
            {
                  System.Text.StringBuilder sb = new System.Text.StringBuilder();
                  if( (extras & PhotoSearchExtras.DateTaken) == PhotoSearchExtras.DateTaken )
                        sb.Append("date_taken");
                  if( (extras & PhotoSearchExtras.DateUploaded) == PhotoSearchExtras.DateUploaded )
                  {
                        if( sb.Length>0 ) sb.Append(",");
                        sb.Append("date_upload");
                  }
                  if( (extras & PhotoSearchExtras.IconServer) == PhotoSearchExtras.IconServer )
                  {
                        if( sb.Length>0 ) sb.Append(",");
                        sb.Append("icon_server");
                  }
                  if( (extras & PhotoSearchExtras.License) == PhotoSearchExtras.License )
                  {
                        if( sb.Length>0 ) sb.Append(",");
                        sb.Append("license");
                  }
                  if( (extras & PhotoSearchExtras.OwnerName) == PhotoSearchExtras.OwnerName )
                  {
                        if( sb.Length>0 ) sb.Append(",");
                        sb.Append("owner_name");
                  }
                  if( (extras & PhotoSearchExtras.OriginalFormat) == PhotoSearchExtras.OriginalFormat )
                  {
                        if( sb.Length>0 ) sb.Append(",");
                        sb.Append("original_format");
                  }

                  if( (extras & PhotoSearchExtras.LastUpdated) == PhotoSearchExtras.LastUpdated )
                  {
                        if( sb.Length>0 ) sb.Append(",");
                        sb.Append("last_update");
                  }

                  if( (extras & PhotoSearchExtras.Tags) == PhotoSearchExtras.Tags )
                  {
                        if( sb.Length>0 ) sb.Append(",");
                        sb.Append("tags");
                  }

                  if( (extras & PhotoSearchExtras.Geo) == PhotoSearchExtras.Geo )
                  {
                        if( sb.Length>0 ) sb.Append(",");
                        sb.Append("geo");
                  }

                  return sb.ToString();
            }

            internal static string SortOrderToString(PhotoSearchSortOrder order)
            {
                  switch(order)
                  {
                        case PhotoSearchSortOrder.DatePostedAsc:
                              return "date-posted-asc";
                        case PhotoSearchSortOrder.DatePostedDesc:
                              return "date-posted-desc";
                        case PhotoSearchSortOrder.DateTakenAsc:
                              return "date-taken-asc";
                        case PhotoSearchSortOrder.DateTakenDesc:
                              return "date-taken-desc";
                        case PhotoSearchSortOrder.InterestingnessAsc:
                              return "interestingness-asc";
                        case PhotoSearchSortOrder.InterestingnessDesc:
                              return "interestingness-desc";
                        case PhotoSearchSortOrder.Relevance:
                              return "relevance";
                        default:
                              return null;
                  }
            }

            internal static void PartialOptionsIntoArray(PartialSearchOptions options, Hashtable parameters)
            {
                  if( options.MinUploadDate != DateTime.MinValue ) parameters.Add("min_uploaded_date", Utils.DateToUnixTimestamp(options.MinUploadDate).ToString());
                  if( options.MaxUploadDate != DateTime.MinValue ) parameters.Add("max_uploaded_date", Utils.DateToUnixTimestamp(options.MaxUploadDate).ToString());
                  if( options.MinTakenDate != DateTime.MinValue ) parameters.Add("min_taken_date", options.MinTakenDate.ToString("yyyy-MM-dd HH:mm:ss"));
                  if( options.MaxTakenDate != DateTime.MinValue ) parameters.Add("max_taken_date", options.MaxTakenDate.ToString("yyyy-MM-dd HH:mm:ss"));
                  if( options.Extras != PhotoSearchExtras.None ) parameters.Add("extras", options.ExtrasString);
                  if( options.SortOrder != PhotoSearchSortOrder.None ) parameters.Add("sort", options.SortOrderString);
                  if( options.PerPage > 0 ) parameters.Add("per_page", options.PerPage.ToString());
                  if( options.Page > 0 ) parameters.Add("page", options.Page.ToString());
                  if( options.PrivacyFilter != PrivacyFilter.None ) parameters.Add("privacy_filter", options.PrivacyFilter.ToString("d"));
            }

            internal static void WriteInt32(Stream s, int i)
            {
                  s.WriteByte((byte) (i & 0xFF));
                  s.WriteByte((byte) ((i >> 8) & 0xFF));
                  s.WriteByte((byte) ((i >> 16) & 0xFF));
                  s.WriteByte((byte) ((i >> 24) & 0xFF));
            }

            internal static void WriteString(Stream s, string str)
            {
                  WriteInt32(s, str.Length);
                  foreach (char c in str)
                  {
                        s.WriteByte((byte) (c & 0xFF));
                        s.WriteByte((byte) ((c >> 8) & 0xFF));
                  }
            }

            internal static void WriteAsciiString(Stream s, string str)
            {
                  WriteInt32(s, str.Length);
                  foreach (char c in str)
                  {
                        s.WriteByte((byte) (c & 0x7F));
                  }
            }

            internal static int ReadInt32(Stream s)
            {
                  int i = 0, b;
                  for (int j = 0; j < 4; j++)
                  {
                        b = s.ReadByte();
                        if (b == -1)
                              throw new IOException("Unexpected EOF encountered");
                        i |= (b << (j * 8));
                  }
                  return i;
            }

            internal static string ReadString(Stream s)
            {
                  int len = ReadInt32(s);
                  char[] chars = new char[len];
                  for (int i = 0; i < len; i++)
                  {
                        int hi, lo;
                        lo = s.ReadByte();
                        hi = s.ReadByte();
                        if (lo == -1 || hi == -1)
                              throw new IOException("Unexpected EOF encountered");
                        chars[i] = (char) (lo | (hi << 8));
                  }
                  return new string(chars);
            }

            internal static string ReadAsciiString(Stream s)
            {
                  int len = ReadInt32(s);
                  char[] chars = new char[len];
                  for (int i = 0; i < len; i++)
                  {
                        int c = s.ReadByte();
                        if (c == -1)
                              throw new IOException("Unexpected EOF encountered");
                        chars[i] = (char) (c & 0x7F);
                  }
                  return new string(chars);
            }

            private const string photoUrl = "http://farm{0}.static.flickr.com/{1}/{2}_{3}{4}.{5}";

            internal static string UrlFormat(Photo p, string size, string format)
            {
                  if( size == "_o" )
                        return UrlFormat(photoUrl, p.Farm, p.Server, p.PhotoId, p.OriginalSecret, size, format);
                  else
                        return UrlFormat(photoUrl, p.Farm, p.Server, p.PhotoId, p.Secret, size, format);
            }

            internal static string UrlFormat(PhotoInfo p, string size, string format)
            {
                  if( size == "_o" )
                        return UrlFormat(photoUrl, p.Farm, p.Server, p.PhotoId, p.OriginalSecret, size, format);
                  else
                        return UrlFormat(photoUrl, p.Farm, p.Server, p.PhotoId, p.Secret, size, format);
            }

            internal static string UrlFormat(Photoset p, string size, string format)
            {
                  return UrlFormat(photoUrl, p.Farm, p.Server, p.PrimaryPhotoId, p.Secret, size, format);
            }

            private static string UrlFormat(string format, params object[] parameters)
            {
                  return String.Format(format, parameters);
            }

            private static readonly Hashtable _serializers = new Hashtable();

            private static XmlSerializer GetSerializer(Type type)
            {
                  if( _serializers.ContainsKey(type.Name) )
                        return (XmlSerializer)_serializers[type.Name];
                  else
                  {
                        XmlSerializer s = new XmlSerializer(type);
                        _serializers.Add(type.Name, s);
                        return s;
                  }
            }
            /// <summary>
            /// Converts the response string (in XML) into the <see cref="Response"/> object.
            /// </summary>
            /// <param name="responseString">The response from Flickr.</param>
            /// <returns>A <see cref="Response"/> object containing the details of the </returns>
00309             internal static Response Deserialize(string responseString)
            {
                  XmlSerializer serializer = GetSerializer(typeof(FlickrNet.Response));
                  try
                  {
                        // Deserialise the web response into the Flickr response object
                        StringReader responseReader = new StringReader(responseString);
                        FlickrNet.Response response = (FlickrNet.Response)serializer.Deserialize(responseReader);
                        responseReader.Close();

                        return response;
                  }
                  catch(InvalidOperationException ex)
                  {
                        // Serialization error occurred!
                        throw new ResponseXmlException("Invalid response received from Flickr.", ex);
                  }
            }

            internal static object Deserialize(System.Xml.XmlNode node, Type type)
            {
                  XmlSerializer serializer = GetSerializer(type);
                  try
                  {
                        // Deserialise the web response into the Flickr response object
                        System.Xml.XmlNodeReader reader = new System.Xml.XmlNodeReader(node);
                        object o = serializer.Deserialize(reader);
                        reader.Close();

                        return o;
                  }
                  catch(InvalidOperationException ex)
                  {
                        // Serialization error occurred!
                        throw new ResponseXmlException("Invalid response received from Flickr.", ex);
                  }
            }



      }

}

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