// sends a slack message asynchronous
// throws exception if message can not be sent
public static async Task SendMessageAsync(string token, SlackMessage msg)
{
// serialize method parameters to JSON
var content = JsonConvert.SerializeObject(msg);
var httpContent = new StringContent(
content,
Encoding.UTF8,
"application/json"
);
// set token in authorization header
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
// send message to API
var response = await client.PostAsync("https://slack.com/api/chat.postMessage", httpContent);
// fetch response from API
var responseJson = await response.Content.ReadAsStringAsync();
// convert JSON response to object
SlackMessageResponse messageResponse =
JsonConvert.DeserializeObject <SlackMessageResponse>(responseJson);
// throw exception if sending failed
if (messageResponse.ok == false)
{
throw new Exception(
"failed to send message. error: " + messageResponse.error
);
}
}
protected async virtual void OnMessageReceived(MessageSlackMessage messageSlackMessage)
{
if (messageSlackMessage != null)
{
WriteLineToConsole($"Message received");
string text = messageSlackMessage.Text;
if ((String.IsNullOrEmpty(text) == false) && ((text.StartsWith($"@{_name}") == true) || (text.StartsWith($"<@{_id}>") == true)))
{
string channelID = messageSlackMessage.ChannelID;
User user = _users.Where(m => (m.ID == messageSlackMessage.UserID)).FirstOrDefault();
SlackMessageContext slackMessageContext = new SlackMessageContext(channelID, user, text);
WriteLineToConsole($"Message for {_name} from {user.Name}");
foreach (MessageHandler messageHandler in _messageHandlers.Where(m => (m.IsHandle(slackMessageContext) == true)))
{
SlackMessageResponse oSlackMessageResponse = messageHandler.GetResponse(slackMessageContext);
await SendTypingResponse(slackMessageContext);
await Send(slackMessageContext, oSlackMessageResponse);
}
}
}
}
private async Task Send(SlackMessageContext slackMessageContext, SlackMessageResponse slackMessageResponse)
{
BotResponderSlackResponse oBotResponderSlackResponse = new BotResponderSlackResponse()
{
Channel = slackMessageContext.ChannelID,
ID = DateTime.Now.Ticks,
Text = slackMessageResponse.Text
};
await Send(oBotResponderSlackResponse);
}
// main method with logic
public static void Main()
{
String token = "xoxp-YOUR-TOKEN";
/////////////////////
// Step 1: Upload file to Slack
var parameters = new NameValueCollection();
// put your token here
parameters["token"] = token;
var client1 = new WebClient();
client1.QueryString = parameters;
byte[] responseBytes1 = client1.UploadFile(
"https://slack.com/api/files.upload",
"C:\\Temp\\Stratios_down.jpg"
);
String responseString1 = Encoding.UTF8.GetString(responseBytes1);
SlackFileResponse fileResponse1 =
JsonConvert.DeserializeObject <SlackFileResponse>(responseString1);
String fileId = fileResponse1.file.id;
/////////////////////
// Step 2: Make file public and get the URL
var parameters2 = new NameValueCollection();
parameters2["token"] = token;
parameters2["file"] = fileId;
var client2 = new WebClient();
byte[] responseBytes2 = client2.UploadValues("https://slack.com/api/files.sharedPublicURL", "POST", parameters2);
String responseString2 = Encoding.UTF8.GetString(responseBytes2);
SlackFileResponse fileResponse2 =
JsonConvert.DeserializeObject <SlackFileResponse>(responseString2);
String imageUrl = fileResponse2.file.permalink_public;
/////////////////////
// Step 3: Send message including freshly uploaded image as attachment
var parameters3 = new NameValueCollection();
parameters3["token"] = token;
parameters3["channel"] = "test_new";
parameters3["text"] = "test message 2";
// create attachment
SlackAttachment attachment = new SlackAttachment();
attachment.fallback = "this did not work";
attachment.text = "this is anattachment";
attachment.image_url = imageUrl;
SlackAttachment[] attachments = { attachment };
parameters3["attachments"] = JsonConvert.SerializeObject(attachments);
var client3 = new WebClient();
byte[] responseBytes3 = client3.UploadValues("https://slack.com/api/chat.postMessage", "POST", parameters3);
String responseString3 = Encoding.UTF8.GetString(responseBytes3);
SlackMessageResponse messageResponse =
JsonConvert.DeserializeObject <SlackMessageResponse>(responseString3);
}
