Implement secret functionality

In order to validate requests a field called `secret` has to be sent
containing a secret key which validates the request. A hook will be
executed only if the secret sent with the request matches the hook's
secret.

src/main.rs

@@ -1,7 +1,7 @@
 #![feature(proc_macro_hygiene, decl_macro)]
 
 use anyhow::{anyhow, bail, Result};
-use log::{debug, info, trace};
+use log::{debug, info, trace, warn};
 use regex::Regex;
 use rocket::{fairing::AdHoc, get, post, routes, State};
 use rocket_contrib::json::Json;
@@ -17,6 +17,7 @@ struct Config {
 #[derive(Debug, Deserialize, Serialize)]
 struct Hook {
     action: Option<String>,
+    secrets: Vec<String>,
     filters: HashMap<String, Filter>,
 }
 
@@ -61,7 +62,7 @@ fn execute_hook(name: &str, hook: &Hook, data: &serde_json::Value) -> Result<()>
     if let Some(action) = &hook.action {
         info!("Execute `{}` from hook `{}`", action, name);
 
-        let action = action.split(" ").collect::<Vec<&str>>();
+        let action = action.split(' ').collect::<Vec<&str>>();
 
         let command = Command::new(action[0]).args(&action[1..]).output()?;
 
@@ -91,8 +92,22 @@ fn receive_hook(address: SocketAddr, config: State<Config>, data: Json<Data>) ->
 
     trace!("Data received from: {}\n{}", address, data);
 
-    for (hook_name, hook) in config.hooks.iter() {
-        execute_hook(&hook_name, &hook, &data)?;
+    if let Some(secret) = data.pointer("secret") {
+        if let Some(secret) = secret.as_str() {
+            let hooks: HashMap<&String, &Hook> = config
+                .hooks
+                .iter()
+                .filter(|(_hook_name, hook)| hook.secrets.contains(&secret.to_string()))
+                .collect();
+
+            if hooks.is_empty() {
+                warn!("Secret did not match any hook");
+            } else {
+                for (hook_name, hook) in hooks {
+                    execute_hook(&hook_name, &hook, &data)?;
+                }
+            }
+        }
     }
 
     Ok("Request received.".to_string())