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//! [Slack API Client](https://api.slack.com)
//!
//! It supports [SocketMode](https://api.slack.com/apis/connections/socket), [Event API](https://api.slack.com/apis/connections/events-api), and [WEB API](https://api.slack.com/web).
//!
//! # Usage
//!
//! ## [Web API](https://api.slack.com/methods)
//!
//! ```no_run
//! use slack::chat::post_message::{post_message, PostMessageRequest};
//! use slack::http_client::default_client;
//! use slack_rust as slack;
//! use std::env;
//!
//! #[async_std::main]
//! async fn main() {
//! let slack_bot_token =
//! env::var("SLACK_BOT_TOKEN").unwrap_or_else(|_| panic!("slack bot token is not set."));
//!
//! let slack_api_client = default_client();
//! let param = PostMessageRequest {
//! channel: "channel_id".to_string(),
//! text: Some("Hello world!!".to_string()),
//! ..Default::default()
//! };
//!
//! let response = post_message(&slack_api_client, ¶m, &slack_bot_token)
//! .await
//! .expect("api call error");
//! println!("{:?}", response);
//! }
//! ```
//!
//! ### Builder
//!
//! ```ignore
//! let attachments = vec![Attachment::builder()
//! .color("#36a64f".to_string())
//! .author_name("slack-rust".to_string())
//! .author_icon("https://!2.bp.blogspot.com/-3o7K8_p8NNM/WGCRsl8GiCI/AAAAAAABAoc/XKnspjvc0YIoOiSRK9HW6wXhtlnZvHQ9QCLcB/s800/pyoko_hashiru.png".to_string())
//! .title("slack_rust_example".to_string())
//! .build()];
//! let param = PostMessageRequest::builder(slack_channel_id)
//! .text("Hello World!!".to_string())
//! .attachments(attachments)
//! .build();
//! ```
//!
//! ## [Socket Mode](https://api.slack.com/apis/connections/socket-implement)
//!
//! ```no_run
//! use async_trait::async_trait;
//! use slack::chat::post_message::{post_message, PostMessageRequest};
//! use slack::http_client::{default_client, SlackWebAPIClient};
//! use slack::socket::event::{HelloEvent, InteractiveEvent};
//! use slack::socket::socket_mode::{ack, EventHandler, SocketMode, Stream};
//! use slack::views::open::{open, OpenRequest};
//! use slack::views::view::{View, ViewType};
//! use slack_rust as slack;
//! use std::env;
//!
//! #[async_std::main]
//! async fn main() {
//! env_logger::init();
//!
//! let slack_app_token =
//! env::var("SLACK_APP_TOKEN").unwrap_or_else(|_| panic!("slack app token is not set."));
//! let slack_bot_token =
//! env::var("SLACK_BOT_TOKEN").unwrap_or_else(|_| panic!("slack bot token is not set."));
//! let api_client = default_client();
//!
//! SocketMode::new(api_client, slack_app_token, slack_bot_token)
//! .option_parameter("SLACK_CHANNEL_ID".to_string(), "channel_id".to_string())
//! .run(&mut Handler)
//! .await
//! .unwrap_or_else(|_| panic!("socket mode run error."));
//! }
//!
//! pub struct Handler;
//!
//! #[allow(unused_variables)]
//! #[async_trait]
//! impl<S> EventHandler<S> for Handler
//! where
//! S: SlackWebAPIClient,
//! {
//! async fn on_hello(&mut self, socket_mode: &SocketMode<S>, e: HelloEvent, s: &mut Stream) {
//! log::info!("hello event: {:?}", e);
//! }
//! async fn on_interactive(
//! &mut self,
//! socket_mode: &SocketMode<S>,
//! e: InteractiveEvent,
//! s: &mut Stream,
//! ) {
//! log::info!("interactive event: {:?}", e);
//! ack(&e.envelope_id, s)
//! .await
//! .expect("socket mode ack error.");
//!
//! let request = PostMessageRequest {
//! channel: socket_mode
//! .option_parameter
//! .get("SLACK_CHANNEL_ID")
//! .unwrap()
//! .to_string(),
//! text: Some("Hello World!!".to_string()),
//! ..Default::default()
//! };
//! let response = post_message(&socket_mode.api_client, &request, &socket_mode.bot_token)
//! .await
//! .expect("post message api error.");
//! log::info!("post message api response: {:?}", response);
//! }
//! }
//! ```