Webhook

Readme

Allows the sending of WebHooks. At the moment, only slack application/json format is supported. See https://api.slack.com/incoming-webhooks.Events exist for SUCCESS or FAILURE.

• Top tip: Append /slack to the end of a Discord webhook url for it to work.

Limitations

For added security, it is highly recommended to set your webhook path as an environment variable and use NWNX_Util_GetEnvironmentVariable() to construct your path.

Example usage

Example 1

The builder wants to be notified with a simple message when the module has completed start up

• At the end of the on_module_load script, add the following:

  #include "nwnx_webhook"
  ...
  NWNX_WebHook_SendWebHookHTTPS("discordapp.com", NWNX_Util_GetEnvironmentVariable("NWNX_WEBHOOK_DEVELOPER_CHANNEL"), "Module has completed start up.");
  ...

Example 2

The builder wishes to create a function to post a bug report to the Discord developer channel.

#include "nwnx_time"
#include "nwnx_util"
#include "nwnx_webhook_rch"
 
void ReportBug(string sMessage, object oReporter=OBJECT_INVALID)
{
    object oArea = GetArea(oReporter);
    struct NWNX_WebHook_Message stMessage;
    stMessage.sUsername = "NWN Reporter";
    stMessage.sText = "Bug Report";
    stMessage.sAvatarURL = "https://example.com/img/icon.png";
    stMessage.sTitle = "Add to Gitlab?";
    stMessage.sURL = "https://gitlab.example.com/nwn/module/issues/new?issue[title]="+
                     "NWN+Bug+Report&issue[description]="+NWNX_Util_EncodeStringForURL(sMessage);
    stMessage.sColor = "#FF0000";
    stMessage.sAuthorName = GetName(oReporter) + " ("+ GetPCPlayerName(oReporter)+")";
    stMessage.sAuthorIconURL = "https://example.com/img/portrait/" + GetStringLowerCase(GetPortraitResRef(oReporter)) + "t.png";
    stMessage.sThumbnailURL = "https://example.com/img/portrait/po_beetle_s.png";
    stMessage.sDescription = sMessage;
    stMessage.sFooterText = "My_Module_1.00";
    stMessage.sField1Name = "Area Name";
    stMessage.sField1Value = GetName(oArea);
    stMessage.iField1Inline = TRUE;
    stMessage.sField2Name = "Area Tag";
    stMessage.sField2Value = GetTag(oArea);
    stMessage.iField2Inline = TRUE;
    stMessage.sField3Name = "Location";
    stMessage.sField3Value = NWNXLocationToString(GetLocation(oReporter));
    stMessage.iTimestamp = NWNX_Time_GetTimeStamp();
    string sConstructedMsg = NWNX_WebHook_BuildMessageForWebHook("discordapp.com", NWNX_Util_GetEnvironmentVariable("NWNX_WEBHOOK_DEVELOPER_CHANNEL"), stMessage);
    NWNX_WebHook_SendWebHookHTTPS("discordapp.com", NWNX_Util_GetEnvironmentVariable("NWNX_WEBHOOK_DEVELOPER_CHANNEL"), sConstructedMsg);
}

Example 3

The builder wishes to resend a WebHook when one is disallowed due to rate limitations.

• In module OnModuleLoad add:

  NWNX_Events_SubscribeEvent("NWNX_ON_WEBHOOK_FAILED", "event_webhook");

• Create new event_webhook script and enter the following:

  #include "nwnx_events"
  #include "nwnx_webhook"
   
  void main()
  {
      object oModule = OBJECT_SELF;
      string sCurrentEvent = NWNX_Events_GetCurrentEvent();
      if (sCurrentEvent == "NWNX_ON_WEBHOOK_FAILED")
      {
          int iStatus = StringToInt(NWNX_Events_GetEventData("STATUS"));
          // Status 429 means it was Rate Limited
          if (iStatus == 429)
          {
              // Reset is sent in milliseconds
              float delayToSend = StringToFloat(NWNX_Events_GetEventData("RETRY_AFTER")) / 1000.0f;
              PrintString("WebHook rate limited, resending in "+FloatToString(delayToSend)+" seconds.");
              string sMessage = NWNX_Events_GetEventData("MESSAGE");
              string sHost = NWNX_Events_GetEventData("HOST");
              string sPath = NWNX_Events_GetEventData("PATH");
              NWNX_WebHook_ResendWebHookHTTPS(sHost, sPath, sMessage, delayToSend);
          }
      }
  }

Example 4

The builder wishes to notify the general discord channel when a PC reaches a new level.

• In module OnModuleLoad add:

  NWNX_Events_SubscribeEvent("NWNX_ON_LEVEL_UP_AFTER", "event_level");

• Create new event_level script and enter the following:

  #include "nwnx_events"
  #include "nwnx_time"
  #include "nwnx_util"
  #include "nwnx_webhook_rch"
   
  void main()
  {
      object oPC = OBJECT_SELF;
      string sCurrentEvent = NWNX_Events_GetCurrentEvent();
      if (sCurrentEvent == "NWNX_ON_LEVEL_UP_AFTER")
      {
          struct NWNX_WebHook_Message stMessage;
          stMessage.sUsername = "NWN Reporter";
          stMessage.sAvatarURL = "https://example.com/img/icon.png";
          stMessage.sTitle = "New Level!";
          stMessage.sColor = "#0000FF";
          stMessage.sAuthorName = GetName(oPC);
          stMessage.sAuthorIconURL = "https://example.com/img/portrait/" + GetStringLowerCase(GetPortraitResRef(oPC)) + "t.png";
          stMessage.sThumbnailURL = "https://example.com/img/portrait/" + GetStringLowerCase(GetPortraitResRef(oPC)) + "s.png";
          stMessage.sDescription = "**" + GetName(oPC) + "** has reached level **"+IntToString(GetHitDice(oPC))+"**! :tada:";
          stMessage.sFooterText = "My_Module_1.00";
          stMessage.iTimestamp = NWNX_Time_GetTimeStamp();
          string sConstructedMsg = NWNX_WebHook_BuildMessageForWebHook("hook.slack.com", NWNX_Util_GetEnvironmentVariable("NWNX_WEBHOOK_PUBLIC_CHANNEL"), stMessage);
          NWNX_WebHook_SendWebHookHTTPS("hook.slack.com", NWNX_Util_GetEnvironmentVariable("NWNX_WEBHOOK_PUBLIC_CHANNEL"), sConstructedMsg);
      }
  }

Note on Portraits as Images

You may have noticed in this example how portraits are being used in the WebHooks as images. If you want to know how I converted portraits to images to use for this, here were the commands used:

mkdir /tmp/tga
# From the top level you wish to search for your portraits
# Don't forget to include the stock portraits here as well!
find . \( -iname "*_t.tga" -o -iname "*_s.tga" \) -exec cp -- "{}" /tmp/tga \;
cd /tmp/tga
# Make them all lowercase
rename -f 'y/A-Z/a-z/' *
# Convert to png while cropping bottom unused portion of tga
for i in *_t.tga; do convert $i -crop 16x25+0+0 $i.png; done
for i in *_s.tga; do convert $i -crop 32x50+0+0 $i.png; done
# Rename from foo.tga.png to foo.png
rename s/tga.png/png/ *.tga.png
mkdir /tmp/png
mv *.png /tmp/png
# Now upload to your web server

Files
file	nwnx_webhook.nss
file	nwnx_webhook_rch.nss
	Create richer webhook messages suitable for Discord.

Classes
struct	NWNX_WebHook_Message
	For more information on these fields see https://birdie0.github.io/discord-webhooks-guide/. More...

Functions
void	NWNX_WebHook_SendWebHookHTTPS (string host, string path, string message, string username="", int mrkdwn=1)
	Send a slack compatible webhook. More...
void	NWNX_WebHook_ResendWebHookHTTPS (string host, string path, string sMessage, float delay=0.0f)
	Resends a webhook message after a defined delay. More...
string	NWNX_WebHook_BuildMessageForWebHook (string host, string path, struct NWNX_WebHook_Message stMessage, int mrkdwn=1)
	Builds and sends a rich webhook message based on the constructed NWNX_WebHook_Message. More...

Function Documentation

NWNX_WebHook_SendWebHookHTTPS()

void NWNX_WebHook_SendWebHookHTTPS	(	string	host,
		string	path,
		string	message,
		string	username = "",
		int	mrkdwn = 1
	)

Send a slack compatible webhook.

Parameters

host	The web server to send the hook.
path	The path to the hook.
message	The message to dispatch.
username	The username to display as the originator of the hook.
mrkdwn	Set to false if you do not wish your message's markdown be parsed.

Definition at line 29 of file nwnx_webhook.nss.

NWNX_WebHook_ResendWebHookHTTPS()

void NWNX_WebHook_ResendWebHookHTTPS	(	string	host,
		string	path,
		string	sMessage,
		float	delay = 0.0f
	)

Resends a webhook message after a defined delay.

Handy when a submission is rate limited, since the message that the event sends in NWNX_Events_GetEventData is already constructed. So it just resends the WebHook with an optional delay.

Parameters

host	The web server to send the hook.
path	The path to the hook.
sMessage	The message to dispatch.
delay	The delay in seconds to send the message again.

Definition at line 40 of file nwnx_webhook.nss.

NWNX_WebHook_BuildMessageForWebHook()

string NWNX_WebHook_BuildMessageForWebHook	(	string	host,
		string	path,
		struct NWNX_WebHook_Message	stMessage,
		int	mrkdwn = 1
	)

Builds and sends a rich webhook message based on the constructed NWNX_WebHook_Message.

Parameters

host	The web server to send the hook.
path	The path to the hook.
stMessage	A constructed NWNX_Webhook_Message.
mrkdwn	Set to false if you do not wish your message's markdown be parsed.

Warning

Your path must end with /slack if using a Discord webhook.

Definition at line 77 of file nwnx_webhook_rch.nss.