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https://github.com/MinnDevelopment/discord-webhooks

Provides easy to use bindings for the Discord Webhook API
https://github.com/MinnDevelopment/discord-webhooks

discord gradle hacktoberfest java webhooks

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Provides easy to use bindings for the Discord Webhook API

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[version]: https://img.shields.io/maven-central/v/club.minnced/discord-webhooks

[download]: https://mvnrepository.com/artifact/club.minnced/discord-webhooks/latest

[license]: https://img.shields.io/badge/License-Apache%202.0-lightgrey.svg

[license-file]: https://github.com/MinnDevelopment/discord-webhooks/blob/master/LICENSE



[WebhookClient#setErrorHandler]: https://minndevelopment.github.io/discord-webhooks/club/minnced/discord/webhook/WebhookClient.html#setErrorHandler(club.minnced.discord.webhook.util.WebhookErrorHandler)

[WebhookClient#setDefaultErrorHandler]: https://minndevelopment.github.io/discord-webhooks/club/minnced/discord/webhook/WebhookClient.html#setDefaultErrorHandler(club.minnced.discord.webhook.util.WebhookErrorHandler)



[ ![version] ][download]

[ ![license] ][license-file]



# Discord-Webhooks



Originally part of JDA, this library provides easy to use bindings for the

Discord Webhook API.



# Introduction



Here we will give a small overview of the proper usage and applicability of the resources provided by this library.



Documentation is available via the GitHub pages on this repository: [Javadoc](https://minndevelopment.github.io/discord-webhooks/overview-tree.html)



## Limitations



Webhooks on discord are only capable of sending messages, nothing more. For anything else you either have to use OAuth2 or a bot account. This library does not provide any functionality for creating or modifying webhooks.



## Getting Started



The first thing to do is to create either a `WebhookClient` or a `WebhookCluster`. The `WebhookClient` provides functionality to send messages to one webhook based on either a webhook URL or the ID and token of a webhook. It implements automatic rate-limit handling and can be configured to use a shared thread-pool.



### Creating a WebhookClient



```java

// Using the builder

WebhookClientBuilder builder = new WebhookClientBuilder(url); // or id, token

builder.setThreadFactory((job) -> {

    Thread thread = new Thread(job);

    thread.setName("Hello");

    thread.setDaemon(true);

    return thread;

});

builder.setWait(true);

WebhookClient client = builder.build();

```



```java

// Using the factory methods

WebhookClient client = WebhookClient.withUrl(url); // or withId(id, token)

```



### Creating a WebhookCluster



```java

// Create and initialize the cluster

WebhookCluster cluster = new WebhookCluster(5); // create an initial 5 slots (dynamic like lists)

cluster.setDefaultHttpClient(new OkHttpClient());

cluster.setDefaultDaemon(true);



// Create a webhook client

cluster.buildWebhook(id, token);



// Add an existing webhook client

cluster.addWebhook(client);

```



## Sending Messages



Sending messages happens in a background thread (configured through the pool/factory) and thus is async by default. To access the message you have to enable the `wait` mechanic (enabled by default). With this you can use the callbacks provided by `CompletableFuture`.



```java

// Send and forget

client.send("Hello World");



// Send and log (using embed)

WebhookEmbed embed = new WebhookEmbedBuilder()

        .setColor(0xFF00EE)

        .setDescription("Hello World")

        .build();



client.send(embed)

      .thenAccept((message) -> System.out.printf("Message with embed has been sent [%s]%n", message.getId()));



// Change appearance of webhook message

WebhookMessage message = new WebhookMessageBuilder()

        .setUsername("Minn") // use this username

        .setAvatarUrl(avatarUrl) // use this avatar

        .setContent("Hello World")

        .build();

client.send(message);

```



## Threads



You can use the webhook clients provided by this library to send messages in threads. There are two ways to accomplish this.



Set a thread id in the client builder to send all messages in that client to the thread:



```java

WebhookClient client = new WebhookClientBuilder(url)

        .setThreadId(threadId)

        .build();



client.send("Hello"); // appears in the thread

```



Use `onThread` to create a client with a thread id and all other settings inherited:



```java

try (WebhookClient client = WebhookClient.withUrl(url)) {

    WebhookClient thread = client.onThread(123L);

    thread.send("Hello"); // appears only in the thread with id 123

    client.send("Friend"); // appears in the channel instead

} // calls client.close() which automatically also closes all onThread clients as well.

```



All `WebhookClient` instances created with `onThread` will share the same thread pool used by the original client. This means that shutting down or closing any of the clients will also close all other clients associated with that underlying thread pool.



```java

WebhookClient thread = null;

try (WebhookClient client = WebhookClient.withUrl(url)) {

    thread = client.onThread(id);

} // closes client

thread.send("Hello"); // <- throws rejected execution due to pool being shutdown by client.close() above ^



WebhookClient client = WebhookClient.withUrl(url);

try (WebhookClient thread = client.onThread(id)) {

    thread.send("...");

} // closes thread

client.send("Hello");  // <- throws rejected execution due to pool being shutdown by thread.close() above ^

```



### Shutdown



Since the clients use threads for sending messages you should close the client to end the threads. This can be ignored if a shared thread-pool is used between multiple clients but that pool has to be shutdown by the user accordingly.



```java

try (WebhookClient client = WebhookClient.withUrl(url)) {

    client.send("Hello World");

} // client.close() automated



webhookCluster.close(); // closes each client and can be used again

```



## Error Handling



By default, this library will log every exception encountered when sending a message using the SLF4J logger implementation.

This can be configured using [WebhookClient#setErrorHandler] to custom behavior per client or [WebhookClient#setDefaultErrorHandler] for all clients.



### Example



```java

WebhookClient.setDefaultErrorHandler((client, message, throwable) -> {

    System.err.printf("[%s] %s%n", client.getId(), message);

    if (throwable != null)

        throwable.printStackTrace();

    // Shutdown the webhook client when you get 404 response (may also trigger for client#edit calls, be careful)

    if (throwable instanceof HttpException ex && ex.getCode() == 404) {

        client.close();

    }

});

```



## External Libraries



This library also supports sending webhook messages with integration from other libraries such as



- [JDA](/DV8FromTheWorld/JDA) (version 5.0.0-beta.12) with [JDAWebhookClient](https://github.com/MinnDevelopment/discord-webhooks/blob/master/src/main/java/club/minnced/discord/webhook/external/JDAWebhookClient.java)

- [Discord4J](/Discord4J/Discord4J) (version 3.2.5) with [D4JWebhookClient](https://github.com/MinnDevelopment/discord-webhooks/blob/master/src/main/java/club/minnced/discord/webhook/external/D4JWebhookClient.java)

- [Javacord](/Javacord/Javacord) (version 3.8.0) with [JavacordWebhookClient](https://github.com/MinnDevelopment/discord-webhooks/blob/master/src/main/java/club/minnced/discord/webhook/external/JavacordWebhookClient.java)



### Example JDA



```java

public void sendWebhook(Webhook webhook) {

    MessageCreateData message = new MessageCreateBuilder().setContent("Hello World").build();

    try (JDAWebhookClient client = JDAWebhookClient.from(webhook)) { // create a client instance from the JDA webhook

        client.send(message); // send a JDA message instance

    }

}

```



### Example Discord4J



```java

public void sendWebhook(Webhook webhook) {

    try (D4JWebhookClient client = D4JWebhookClient.from(webhook)) {

        client.send(MessageCreateSpec.create()

            .withContent("Hello World")

            .addFile("cat.png", new FileInputStream("cat.png"))

        );

    }

}

```



# Download



[ ![version] ][download]



Note: Replace `%VERSION%` below with the desired version.



## Gradle



```gradle

repositories {

    mavenCentral()

}

```



```gradle

dependencies {

    implementation("club.minnced:discord-webhooks:%VERSION%")

}

```



## Maven



```xml



    club.minnced

    discord-webhooks

    %VERSION%



```



## Compile Yourself



1. Clone repository

1. Run `gradlew shadowJar`

1. Use jar suffixed with `-all.jar` in `build/libs`



# Example



```java

class MyAppender extends AppenderBase {

    private final WebhookClient client;



    @Override

    protected void append(LoggingEvent eventObject) {

        if (client == null)

            return;

        WebhookEmbedBuilder builder = new WebhookEmbedBuilder();

        builder.setDescription(eventObject.getFormattedMessage());

        int color = -1;

        switch (eventObject.getLevel().toInt()) {

            case ERROR_INT:

                color = 0xFF0000;

                break;

            case INFO_INT:

                color = 0xF8F8FF;

                break;

        }

        if (color > 0)

            builder.setColor(color);

        builder.setTimestamp(Instant.ofEpochMilli(eventObject.getTimeStamp()));

        client.send(builder.build());

    }

}

```



> This is an example implementation of an Appender for logback-classic