1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http.Headers;
using System.Xml;
using System.Net.Http;
namespace SendGridMail.Transport
{
public class Web : ITransport
{
#region Properties
//TODO: Make this configurable
public const String BaseUrl = "sendgrid.com/api/";
public const String Endpoint = "/api/mail.send";
public const String JsonFormat = "json";
public const String XmlFormat = "xml";
private readonly NetworkCredential _credentials;
private readonly bool _https;
#endregion
/// <summary>
/// Factory method for Web transport of sendgrid messages
/// </summary>
/// <param name="credentials">SendGrid credentials for sending mail messages</param>
/// <param name="https">Use https?</param>
/// <returns>New instance of the transport mechanism</returns>
public static Web GetInstance(NetworkCredential credentials, bool https = true)
{
return new Web(credentials, https);
}
/// <summary>
/// Creates a new Web interface for sending mail. Preference is using the Factory method.
/// </summary>
/// <param name="credentials">SendGrid user parameters</param>
/// <param name="https">Use https?</param>
internal Web(NetworkCredential credentials, bool https = true)
{
_https = https;
_credentials = credentials;
}
/// <summary>
/// Delivers a message over SendGrid's Web interface
/// </summary>
/// <param name="message"></param>
public void Deliver(ISendGrid message)
{
var client = new HttpClient
{
BaseAddress = _https ? new Uri("https://" + BaseUrl) : new Uri("http://" + BaseUrl)
};
var content = new MultipartFormDataContent();
AttachFormParams(message, content);
AttachFiles(message, content);
var response = client.PostAsync(Endpoint + ".xml", content).Result;
CheckForErrors(response);
}
#region Support Methods
private void AttachFormParams(ISendGrid message, MultipartFormDataContent content)
{
var formParams = FetchFormParams(message);
foreach (var keyValuePair in formParams)
{
content.Add(new StringContent(keyValuePair.Value), keyValuePair.Key);
}
}
private void AttachFiles(ISendGrid message, MultipartFormDataContent content)
{
var files = FetchFileBodies (message);
foreach (var file in files)
{
var fs = new FileStream(file.Key, FileMode.Open, FileAccess.Read);
var fileContent = new StreamContent(fs);
fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data")
{
Name = "files[" + Path.GetFileName(file.Key) + "]",
FileName = Path.GetFileName(file.Key)
};
fileContent.Headers.ContentType = MediaTypeHeaderValue.Parse("application/octet-stream");
content.Add(fileContent);
}
var streamingFiles = FetchStreamingFileBodies(message);
foreach (KeyValuePair<string, MemoryStream> file in streamingFiles) {
var name = file.Key;
var stream = file.Value;
var fileContent = new StreamContent(stream);
fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data")
{
Name = "files[" + Path.GetFileName(file.Key) + "]",
FileName = Path.GetFileName(file.Key)
};
fileContent.Headers.ContentType = MediaTypeHeaderValue.Parse("application/octet-stream");
content.Add(fileContent);
}
}
private void CheckForErrors (HttpResponseMessage response)
{
//transport error
if (response.StatusCode != HttpStatusCode.OK) {
throw new Exception(response.ReasonPhrase);
}
//TODO: check for HTTP errors... don't throw exceptions just pass info along?
var content = response.Content.ReadAsStreamAsync().Result;
using (var reader = XmlReader.Create(content))
{
while (reader.Read())
{
if (reader.IsStartElement())
{
switch (reader.Name)
{
case "result":
break;
case "message": // success
bool errors = reader.ReadToNextSibling("errors");
if (errors)
throw new ProtocolViolationException();
return;
case "error": // failure
throw new ProtocolViolationException();
default:
throw new ArgumentException("Unknown element: " + reader.Name);
}
}
}
}
}
internal List<KeyValuePair<String, String>> FetchFormParams(ISendGrid message)
{
var result = new List<KeyValuePair<string, string>>
{
new KeyValuePair<String, String>("api_user", _credentials.UserName),
new KeyValuePair<String, String>("api_key", _credentials.Password),
new KeyValuePair<String, String>("headers", message.Headers.Count == 0 ? null : Utils.SerializeDictionary(message.Headers)),
new KeyValuePair<String, String>("replyto", message.ReplyTo.Length == 0 ? null : message.ReplyTo.ToList().First().Address),
new KeyValuePair<String, String>("from", message.From.Address),
new KeyValuePair<String, String>("fromname", message.From.DisplayName),
new KeyValuePair<String, String>("subject", message.Subject),
new KeyValuePair<String, String>("text", message.Text),
new KeyValuePair<String, String>("html", message.Html),
new KeyValuePair<String, String>("x-smtpapi", message.Header.AsJson())
};
if(message.To != null)
{
result = result.Concat(message.To.ToList().Select(a => new KeyValuePair<String, String>("to[]", a.Address)))
.Concat(message.To.ToList().Select(a => new KeyValuePair<String, String>("toname[]", a.DisplayName)))
.ToList();
}
if(message.Bcc != null)
{
result = result.Concat(message.Bcc.ToList().Select(a => new KeyValuePair<String, String>("bcc[]", a.Address)))
.ToList();
}
if(message.Cc != null)
{
result = result.Concat(message.Cc.ToList().Select(a => new KeyValuePair<String, String>("cc[]", a.Address)))
.ToList();
}
return result.Where(r => !String.IsNullOrEmpty(r.Value)).ToList();
}
internal List<KeyValuePair<String, MemoryStream>> FetchStreamingFileBodies(ISendGrid message)
{
return message.StreamedAttachments.Select(kvp => kvp).ToList();
}
internal List<KeyValuePair<String, FileInfo>> FetchFileBodies(ISendGrid message)
{
if(message.Attachments == null)
return new List<KeyValuePair<string, FileInfo>>();
return message.Attachments.Select(name => new KeyValuePair<String, FileInfo>(name, new FileInfo(name))).ToList();
}
#endregion
}
}
|
