/src/Amptools/Public/blogs/michaelherndon/archives/2008_07_13_index.aspx
ASP.NET | 488 lines | 372 code | 116 blank | 0 comment | 30 complexity | b021e4de52dce8e89c9ee8c221ebe717 MD5 | raw file
1<%@ Page Title="amptools.net: 07.13.2008" Language="C#" MasterPageFile="~/App/Views/Layouts/Site.Master" AutoEventWireup="true" CodeBehind="Index.aspx.cs" Inherits="System.Web.Mvc.ViewPage" %> 2<asp:Content ID="Content2" ContentPlaceHolderID="Head" runat="server"> 3 <link href='/Content/default/css/syntax-highlighter.css' rel="stylesheet" type="text/css" /> 4 <link rel="alternate" type="application/rss+xml" title="amptools.net - RSS" href="http://feeds.feedburner.com/amptoolsnet" /> 5 <link rel="service.post" type="application/atom+xml" title="amptools.net - Atom" href="http://www.blogger.com/feeds/7043853799247804655/posts/default" /> 6 <link rel="EditURI" type="application/rsd+xml" title="RSD" href="http://www.blogger.com/rsd.g?blogID=7043853799247804655" /> 7 <style type="text/css"> 8 @import url("http://www.blogger.com/css/blog_controls.css"); 9 @import url("http://www.blogger.com/dyn-css/authorization.css?targetBlogID=7043853799247804655"); 10 </style> 11 12 <script type="text/javascript" src="http://www.blogger.com/js/backlink.js"></script> 13 <script type="text/javascript" src="http://www.blogger.com/js/backlink_control.js"></script> 14 <script type="text/javascript">var BL_backlinkURL = "http://www.blogger.com/dyn-js/backlink_count.js";var BL_blogId = "7043853799247804655";</script> 15</asp:Content> 16 17<asp:Content ID="Content3" ContentPlaceHolderID="Javascript" runat="server"> 18 <script type="text/javascript" src="~/javascripts/prototype.js"></script> 19 <script type="text/javascript" src="~/javascripts/syntax-highlighter/shCore.js"></script> 20 <script type="text/javascript" src="~/javascripts/syntax-highlighter/shBrushCSharp.js"></script> 21 <script type="text/javascript" src="~/javascripts/syntax-highlighter/shBrushRuby.js"></script> 22 <script type="text/javascript" src="~/javascripts/syntax-highlighter/shBrushJScript.js"></script> 23 <script type="text/javascript" src="~/javascripts/syntax-highlighter/shBrushCss.js"></script> 24 <script type="text/javascript" src="~/javascripts/syntax-highlighter/shBrushSql.js"></script> 25 <script type="text/javascript" src="~/javascripts/syntax-highlighter/shBrushXml.js"></script> 26 <script type="text/javascript"> 27 //<[CDATA[ 28 dp.SyntaxHighlighter.HighlightAll('code'); 29 //]]> 30 </script> 31</asp:Content> 32<asp:Content ID="Content1" ContentPlaceHolderID="main" runat="server"> 33 34 35 <div class="left"> 36 <h2 class="silver"> 37 "Working on the complexity that is always indirectly implied by simpilicity." 38 </h2> 39 40 41 42 <h2 class="blog-title"><a name="8164722880411458481"></a> 43 44 Using WCF to access the Flickr JSON API 45 46 <span class="blog-byline"> 47 by: michael herndon, at: 7/17/2008 06:40:00 AM 48 </span> 49 50 </h2> 51 <div class="blog-content"> 52 <p>Even though there are quite a few opensource .Net libraries REST API out there, and a really impressive one for Flickr, they tend to never evolve or fork to use the newer framework technologies.  I think its great that they support 1.0, 2.0, and mono, but why not fork and support WCF?  I think part of the problem that .Net 3.5 use is not wide spread as it should be is not only information overload and bad naming for extension libraries, but also lack of opensource support to provide libraries and basis for current technology.  </p> <p>Flickr tends to be a little more tricky to use when calling it than some other REST APIs. WCF is a cool technology, but needs to be massaged when using it with Flickr due to a couple of gotchas and not so obvious things about WCF. In order to use Flickr, you need to register for an api_key and a shared secret code which is used to create an MD5 hash. You also need to create that MD5 each time you call a method, using the url parameters in a certain way. </p> <p>There are also a few not so obvious factors about using the JSON part of Flickr. All of the .Net libraries I've seen so far, use XML. While C# is king of parsing  XML, JSON tends to be more compact, which means less expense over the wire, though it might mean more time parsing once on the developers end point. So there are tradeoffs to using it. </p> <p>When I created the classes needed to use WCF to call Flickr, I have the actual "DataContract" object (DTO, Data Transfer Object), A Hash (Dictionary<string, object>) for adding the parameters to create the MD5 signature, A base class for creating the WCF proxy, a custom "WebContentTypeMapper", The "ServiceContract" interface, the actual "Client class", and a mixins class for creating the MD5. </p> <p>Here are some of the gotchas that I ran into while getting WCF to work with Flickr. </p> <p></p> <ol> <li>Flickr makes you create a md5 hash to send with every call for ALL parameters in alphabetical order using your "Shared Secret" Code as part of the md5.   </li> <li>Flickr's Json response "Content-Type" header is sent not as "application/json" but as "text/plain" which equates to "Raw" in WCF lingo.  </li> <li>The response object is wrapped and not obvious when it comes to json how the DataContract object should be formed.  </li> <li>Flickr will wrap the json response in a javascript function unless you pass in the parameter "nojsoncallback=1" </li> </ol> <p>To get around number one, I created an extension method that takes a Hash (Dictionary<string, object>) and adds method that converts the parameters into a MD5 string. </p> <pre class="code csharp">namespace Amplify.Linq 53{ 54 using System; 55 using System.Collections.Generic; 56 using System.Linq; 57 using System.Text; 58 59#if STANDALONE 60 public class Hash : Dictionary<string, object> 61 { 62 63 64 65 66 } 67#endif 68} 69// different file 70 71namespace Amplify.Linq 72{ 73 using System; 74 using System.Collections.Generic; 75 using System.Linq; 76 using System.Security.Cryptography; 77 using System.Text; 78 79 using Amplify.Linq; 80 81 public static class Mixins 82 { 83 84 85 86 public static string ToMD5(this Hash obj, string secret) 87 { 88 var query = from item in obj 89 orderby item.Key ascending 90 select item.Key + item.Value.ToString(); 91 92 StringBuilder builder = new StringBuilder(secret, 2048); 93 94 foreach (string item in query) 95 builder.Append(item); 96 97 MD5CryptoServiceProvider crypto = new MD5CryptoServiceProvider(); 98 byte[] bytes = Encoding.UTF8.GetBytes(builder.ToString()); 99 byte[] hashedBytes = crypto.ComputeHash(bytes, 0, bytes.Length); 100 return BitConverter.ToString(hashedBytes).Replace("-", "").ToLower(); 101 } 102 103 } 104}</pre> 105 106<p>Well Gotcha number two, took a bit of research to figure it out. The error I got was that it was looking for Json or XML but could not do anything with "Raw". So the solution is to create a custom binding with a custom WebContentTypeManager. </p> 107 108<pre class="code csharp">namespace Amplify.Flickr 109{ 110 using System.ServiceModel; 111 using System.ServiceModel.Channels; 112 using System.Runtime.Serialization; 113 using System.ServiceModel.Web; 114 115 public class JsonContentMapper : WebContentTypeMapper 116 { 117 public override WebContentFormat GetMessageFormatForContentType(string contentType) 118 { 119 return WebContentFormat.Json; 120 } 121 } 122} 123 124// different file 125 126namespace Amplify.Flickr 127{ 128 using System; 129 using System.Collections.Generic; 130 using System.Linq; 131 using System.Text; 132 using System.ServiceModel; 133 using System.ServiceModel.Channels; 134 using System.ServiceModel.Description; 135 using System.ServiceModel.Web; 136 137 using Amplify.Linq; 138 139 public class FlickrClient<T> 140 { 141 protected string Secret { get; set; } 142 143 protected string Key { get; set; } 144 145 protected string Token { get; set; } 146 147 protected string Url { get; set; } 148 149 protected T Proxy { get; set; } 150 151 152 public FlickrClient(string key, string secret) 153 { 154 this.Key = key; 155 this.Secret = secret; 156 this.Url = "http://api.flickr.com/services/rest"; 157 this.Proxy = this.InitializeProxy(); 158 } 159 160 public FlickrClient(string key, string secret, string token) 161 :this(key, secret) 162 { 163 this.Token = token; 164 } 165 166 protected virtual T InitializeProxy() 167 { 168 // using custom wrapper 169 CustomBinding binding = new CustomBinding(new WebHttpBinding()); 170 WebMessageEncodingBindingElement property = binding.Elements.Find<WebMessageEncodingBindingElement>(); 171 property.ContentTypeMapper = new JsonContentMapper(); 172 173 174 ChannelFactory<T> channel = new ChannelFactory<T>( 175 binding, this.Url); 176 177 channel.Endpoint.Behaviors.Add( new WebHttpBehavior()); 178 return channel.CreateChannel(); 179 } 180 181 } 182}</pre> 183 184<p>The 3rd issue, to know that all objects are wrapped in a "Response" object. To create a DataContract for the getFrob method on flickr, it took looking at the json to see what it was returning. The object below is the basic form of the Json object that is returned, it also includes the properties in case an error object is returned. </p> 185 186<pre class="code csharp"> using System; 187 using System.Collections.Generic; 188 using System.Linq; 189 using System.Text; 190 using System.Runtime.Serialization; 191 192 [DataContract] 193 public class FrobResponse 194 { 195 [DataMember(Name = "frob")] 196 public JsonObject Frob { get; set; } 197 198 [DataContract(Name = "frob")] 199 public class JsonObject 200 { 201 [DataMember(Name = "_content")] 202 public string Content { get; set; } 203 204 } 205 206 [DataMember(Name = "stat")] 207 public string Status { get; set; } 208 209 [DataMember(Name = "code")] 210 public int Code { get; set; } 211 212 [DataMember(Name = "message")] 213 public string Message { get; set; } 214 } 215 216 // different file 217 218 219 using System; 220 using System.Collections.Generic; 221 using System.Linq; 222 using System.Text; 223 using System.ServiceModel; 224 using System.ServiceModel.Web; 225 226 [ServiceContract] 227 public interface IAuthClient 228 { 229 [OperationContract, 230 WebInvoke( 231 UriTemplate = "/?method=flickr.auth.getFrob&format=json&nojsoncallback=1&api_key={key}&api_sig={signature}", 232 ResponseFormat = WebMessageFormat.Json, 233 BodyStyle = WebMessageBodyStyle.Bare)] 234 FrobResponse GetFrob(string signature, string key); 235 236 [OperationContract, 237 WebInvoke( 238 UriTemplate = "/?method=flickr.auth.getToken&format=json&nojsoncallback=1&api_key={key}&frob={frob}&api_sig={signature}", 239 ResponseFormat = WebMessageFormat.Json, 240 BodyStyle = WebMessageBodyStyle.WrappedResponse)] 241 Auth GetToken(string signature, string key, string frob); 242 } 243 244 245 // the actual client class. 246 247 using System; 248 using System.Collections.Generic; 249 using System.Linq; 250 using System.Text; 251 252 using Amplify.Linq; 253 254 255 public class AuthClient : FlickrClient<IAuthClient> 256 { 257 258 public AuthClient(string key, string secret) 259 :base(key, secret) 260 { } 261 262 public AuthClient(string key, string secret, string token) 263 :base(key, secret, token) 264 { } 265 266 public string GetFrob() 267 { 268 string md5 = new Hash() { 269 {"api_key", this.Key}, 270 {"format", "json"}, 271 {"method", "flickr.auth.getFrob"}, 272 {"nojsoncallback", 1} 273 }.ToMD5(this.Secret); 274 275 FrobResponse response = this.Proxy.GetFrob(md5, this.Key); 276 if (response.Code > 0) 277 throw new Exception(response.Message); 278 279 return response.Frob.Content; 280 } 281 }</pre> <p class="blogger-labels">Labels: <a rel='tag' href="http://www.amptools.net/labels/Amplify.aspx">Amplify</a>, <a rel='tag' href="http://www.amptools.net/labels/C#.aspx">C#</a>, <a rel='tag' href="http://www.amptools.net/labels/Code.aspx">Code</a>, <a rel='tag' href="http://www.amptools.net/labels/CSharp.aspx">CSharp</a>, <a rel='tag' href="http://www.amptools.net/labels/Flickr.aspx">Flickr</a>, <a rel='tag' href="http://www.amptools.net/labels/JSON.aspx">JSON</a>, <a rel='tag' href="http://www.amptools.net/labels/REST.aspx">REST</a>, <a rel='tag' href="http://www.amptools.net/labels/WCF.aspx">WCF</a></p> 282 </div> 283 <div class="blog-footer"> 284 <a class="comment-link" href="http://www.blogger.com/comment.g?blogID=7043853799247804655&postID=8164722880411458481"location.href=http://www.blogger.com/comment.g?blogID=7043853799247804655&postID=8164722880411458481;><span style="text-transform:lowercase">0 Comments</span></a> 285 286 <a class="comment-link" href="http://www.amptools.net/2008/07/using-wcf-to-access-flickr-json-api.aspx#links"><span style="text-transform:lowercase">Links to this post</span></a> 287 <span class="item-action"><a href="http://www.blogger.com/email-post.g?blogID=7043853799247804655&postID=8164722880411458481" title="Email Post"><img class="icon-action" alt="" src="http://www.blogger.com:80/img/icon18_email.gif"/></a></span> 288 289 <script type="text/javascript" src="http://w.sharethis.com/widget/?tabs=web%2Cemail&charset=utf-8&services=reddit%2Cdigg%2Cfacebook%2Cmyspace%2Cdelicious%2Cstumbleupon%2Ctechnorati%2Cpropeller%2Cblinklist%2Cmixx%2Cnewsvine%2Cgoogle_bmarks%2Cyahoo_myweb%2Cwindows_live%2Cfurl&style=rotate&publisher=baa2824f-9291-46c0-87b4-6d5a72508a05&headerbg=%23dddddd&inactivebg=%231bb601&inactivefg=%2370eb00%09&linkfg=%231bb601"></script> 290 </div> 291 292 293 294 <h2 class="blog-title"><a name="1989566401714559482"></a> 295 296 Sample Mixins for HttpRequestBase to use with Asp.Net MVC 297 298 <span class="blog-byline"> 299 by: michael herndon, at: 7/16/2008 12:40:00 AM 300 </span> 301 302 </h2> 303 <div class="blog-content"> 304 <p>Being a semi avid user of rails for my day job, you tend to miss a couple of things that rails has that is not in Asp.Net's MVC framework. It is a great start and the control over the html (minus laziness of whoever ever developed their "Html.DropDownList" extension method, grrr INDENT YOUR NEW LINES!!), is much greater than what webforms gives you. One of the missing things that I miss is the request.xhr?, request.post?, etc methods that end to be helpful when deciding if this is an AJAX call or an actual action call to return the correct page. </p> <p>So how do you determine if the request is an ajax request or just a regular page request. What about enforcing that a page is SSL?  What about doing different things depending if the request is a GET or POST?  </p> <p>So after some googling about headers, rails, and such: here are the first go around of extension methods for HttpRequestBase that should come in handy. </p> <pre class="code csharp">public static class ControllerMixins 305{ 306 307 public static bool IsPost(this HttpRequestBase obj) 308 { 309 return obj.Headers["REQUEST_METHOD"].ToLower() == "post"; 310 } 311 312 public static bool IsGet(this HttpRequestBase obj) 313 { 314 return obj.Headers["REQUEST_METHOD"].ToLower() == "get"; 315 } 316 317 public static bool IsXhr(this HttpRequestBase obj) 318 { 319 string value = obj.Headers["HTTP_X_REQUESTED_WITH"]; 320 return (!string.IsNullOrEmpty(value) && value.ToLower() == "xmlhttprequest"); 321 } 322 323 public static bool IsSSL(this HttpRequestBase obj) 324 { 325 return obj.Headers["HTTPS"] == "on" || 326 obj.Headers["'HTTP_X_FORWARDED_PROTO'"] == "https"; 327 } 328}</pre> <p class="blogger-labels">Labels: <a rel='tag' href="http://www.amptools.net/labels/Asp.Net.aspx">Asp.Net</a>, <a rel='tag' href="http://www.amptools.net/labels/Asp.Net Mvc.aspx">Asp.Net Mvc</a>, <a rel='tag' href="http://www.amptools.net/labels/C#.aspx">C#</a>, <a rel='tag' href="http://www.amptools.net/labels/Code.aspx">Code</a>, <a rel='tag' href="http://www.amptools.net/labels/CSharp.aspx">CSharp</a>, <a rel='tag' href="http://www.amptools.net/labels/Mixins.aspx">Mixins</a></p> 329 </div> 330 <div class="blog-footer"> 331 <a class="comment-link" href="http://www.blogger.com/comment.g?blogID=7043853799247804655&postID=1989566401714559482"location.href=http://www.blogger.com/comment.g?blogID=7043853799247804655&postID=1989566401714559482;><span style="text-transform:lowercase">0 Comments</span></a> 332 333 <a class="comment-link" href="http://www.amptools.net/2008/07/sample-mixins-for-httprequestbase-to.aspx#links"><span style="text-transform:lowercase">Links to this post</span></a> 334 <span class="item-action"><a href="http://www.blogger.com/email-post.g?blogID=7043853799247804655&postID=1989566401714559482" title="Email Post"><img class="icon-action" alt="" src="http://www.blogger.com:80/img/icon18_email.gif"/></a></span> 335 336 <script type="text/javascript" src="http://w.sharethis.com/widget/?tabs=web%2Cemail&charset=utf-8&services=reddit%2Cdigg%2Cfacebook%2Cmyspace%2Cdelicious%2Cstumbleupon%2Ctechnorati%2Cpropeller%2Cblinklist%2Cmixx%2Cnewsvine%2Cgoogle_bmarks%2Cyahoo_myweb%2Cwindows_live%2Cfurl&style=rotate&publisher=baa2824f-9291-46c0-87b4-6d5a72508a05&headerbg=%23dddddd&inactivebg=%231bb601&inactivefg=%2370eb00%09&linkfg=%231bb601"></script> 337 </div> 338 339 340 341 <h2 class="blog-title"><a name="3907268195622759157"></a> 342 343 Amplify's TwitterN, Yet Another C# Twitter REST API Library 344 345 <span class="blog-byline"> 346 by: michael herndon, at: 7/13/2008 03:08:00 PM 347 </span> 348 349 </h2> 350 <div class="blog-content"> 351 <p><a href="http://code.google.com/p/twittern">http://code.google.com/p/twittern</a></p> <p>I put together a C# twitter library that uses WCF's <a href="http://msdn.microsoft.com/en-us/library/system.runtime.serialization.datacontractattribute.aspx">DataContract</a> & <a href="http://msdn.microsoft.com/en-us/library/system.runtime.serialization.datamemberattribute.aspx">DataMembers</a> and .Net 3.5's <a href="http://msdn.microsoft.com/en-us/library/system.runtime.serialization.json.datacontractjsonserializer.aspx">DataContractJsonSerializer</a>.  Its currently in alpha stage, as I need to finish writing the tests, documentation and make a simple WPF client for twitter.  I needed a twitter library for a personal "secret" project of mine and found that most twitter libraries do not keep up with the twitter API and break when using them. Plus they tend to go to great lengths when parsing the xml.  Unfortunately I do not know if this will work on mono yet. It seems that they have "<a href="http://www.mono-project.com/WCF">Olive</a>", which is mono's version of WCF and I've seen where they have a path for the "DataContractJsonSerializer".  If there are any one familiar enough with mono, please by all means use the code, join the project.  </p> <p>One design decision that I made was to use Json rather than xml as its more compact and less data to transfer.  I used WCF because with DataContract & DataMembers you can parse Json and you can name your properties the property way with Pascal Case properties and then tell wcf what attributes of json they represent. This way you don't have properties that look like ruby like "screen_name" or  "profile_sidebar_border_color" in your <a href="http://martinfowler.com/eaaCatalog/dataTransferObject.html">Data Transfer Object</a> in order to deserialize the Json response from twitter. </p> <p> </p> <p>A basic sample of how to use the library is below. </p> <pre class="code csharp"> 352 353using Amplify.Twitter; 354using System.Security; 355 356// ... stuff 357 358public void Test() 359{ 360 SecureString password = new SecureString(); 361 string temp = "password"; 362 for (var i = 0; i < temp.Length; i++) 363 password.AppendChar(temp[i]); 364 365 password.MakeReadOnly(); 366 Twitter.SetCredentials("Username", password); 367 368 StatusService service = Twitter.CreateStatusService(); 369 // or StatusService service = new StatusService("Username", password); 370 371 List<Status> tweets = service.GetUserTimeline("MichaelHerndon"); 372} 373 374</pre> <p class="blogger-labels">Labels: <a rel='tag' href="http://www.amptools.net/labels/Amplify.aspx">Amplify</a>, <a rel='tag' href="http://www.amptools.net/labels/C#.aspx">C#</a>, <a rel='tag' href="http://www.amptools.net/labels/CSharp.aspx">CSharp</a>, <a rel='tag' href="http://www.amptools.net/labels/DataContractJsonSerializer.aspx">DataContractJsonSerializer</a>, <a rel='tag' href="http://www.amptools.net/labels/JSON.aspx">JSON</a>, <a rel='tag' href="http://www.amptools.net/labels/REST.aspx">REST</a>, <a rel='tag' href="http://www.amptools.net/labels/Twitter.aspx">Twitter</a>, <a rel='tag' href="http://www.amptools.net/labels/WCF.aspx">WCF</a></p> 375 </div> 376 <div class="blog-footer"> 377 <a class="comment-link" href="http://www.blogger.com/comment.g?blogID=7043853799247804655&postID=3907268195622759157"location.href=http://www.blogger.com/comment.g?blogID=7043853799247804655&postID=3907268195622759157;><span style="text-transform:lowercase">3 Comments</span></a> 378 379 <a class="comment-link" href="http://www.amptools.net/2008/07/amplify-twittern-yet-another-c-twitter.aspx#links"><span style="text-transform:lowercase">Links to this post</span></a> 380 <span class="item-action"><a href="http://www.blogger.com/email-post.g?blogID=7043853799247804655&postID=3907268195622759157" title="Email Post"><img class="icon-action" alt="" src="http://www.blogger.com:80/img/icon18_email.gif"/></a></span> 381 382 <script type="text/javascript" src="http://w.sharethis.com/widget/?tabs=web%2Cemail&charset=utf-8&services=reddit%2Cdigg%2Cfacebook%2Cmyspace%2Cdelicious%2Cstumbleupon%2Ctechnorati%2Cpropeller%2Cblinklist%2Cmixx%2Cnewsvine%2Cgoogle_bmarks%2Cyahoo_myweb%2Cwindows_live%2Cfurl&style=rotate&publisher=baa2824f-9291-46c0-87b4-6d5a72508a05&headerbg=%23dddddd&inactivebg=%231bb601&inactivefg=%2370eb00%09&linkfg=%231bb601"></script> 383 </div> 384 385 </div> 386 <div class="right"> 387 <h3> 388 Connect 389 </h3> 390 <ul> 391 <li> 392 <a href="http://www.twitter.com/michaelherndon"> 393 <img 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href="http://www.amptools.net/2008/06/pursuit-of-rails-like-active-record-for.aspx">Pursuit of Rails like Active Record for C#</a></li> 462 463 <li><a href="http://www.amptools.net/2008/04/thoughts-on-developing-linq-to-sql.aspx">Thoughts on Developing a Linq To SQL Layer</a></li> 464 465 <li><a href="http://www.amptools.net/2008/04/gallio-mb-unit-3-with-bdd-style-tests-i_05.aspx">Gallio & Mb-Unit 3 With BDD style tests, I mean sp...</a></li> 466 467 <li><a href="http://www.amptools.net/2008/04/test-posting.aspx">Simplicity</a></li> 468 469 </ul> 470 <h3 class="sidebar-title"> 471 Archives 472 </h3> 473 <ul class="archive-list"> 474 475 <li><a href="http://www.amptools.net/blogs/michaelherndon/archives/2008_03_30_index.aspx">03.30.2008</a></li> 476 477 <li><a href="http://www.amptools.net/blogs/michaelherndon/archives/2008_04_06_index.aspx">04.06.2008</a></li> 478 479 <li><a href="http://www.amptools.net/blogs/michaelherndon/archives/2008_06_08_index.aspx">06.08.2008</a></li> 480 481 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