Restructuring of from_data() and configuration

For better readability, correctness and maintainability the
body (which is still rather large, though) was restructured.

Regarding the signature, to be able to configure different fields in
the HTTP header the configuration parameter signature was added.

README.md

@@ -61,6 +61,7 @@ each hook has to be configured, It contains following fields:
   with `{{ /field/pointed/to }}`. Further `{{ event }}` and `{{
   signature }}` are valid variables as they contain the values from
   the regarding header fields of the http request.
+- signature: Name of the HTTP header field containing the signature.
 - secrets: List of secrets.
 - filters: List of filters.
 

src/main.rs

@@ -41,6 +41,7 @@ struct Config {
 #[derive(Debug, Deserialize, Serialize)]
 struct Hook {
     command: String,
+    signature: String,
     secrets: Vec<String>,
     filters: HashMap<String, Filter>,
 }
@@ -52,7 +53,7 @@ struct Filter {
 }
 
 #[derive(Debug)]
-struct Hooks(HashMap<String, Vec<String>>);
+struct Hooks(HashMap<String, String>);
 
 fn validate_request(secret: &str, signature: &str, data: &[u8]) -> Result<()> {
     let mut mac = Hmac::<Sha256>::new_varkey(&secret.as_bytes())
@@ -118,7 +119,7 @@ fn filter_match(
                 )?));
             }
         } else {
-            anyhow!(
+            bail!(
                 "Could not parse pointer in hook `{}` from filter `{}`",
                 hook_name,
                 filter_name
@@ -139,16 +140,9 @@ impl FromDataSimple for Hooks {
     type Error = anyhow::Error;
 
     fn from_data(request: &Request, data: Data) -> data::Outcome<Self, Self::Error> {
-        let config = request.guard::<State<Config>>().unwrap(); // should never fail
-
-        let mut hooks = HashMap::new();
-
-        if let Some(signature) = request.headers().get_one("X-Gitea-Signature") {
-            let mut data = data.open();
         let mut buffer = Vec::new();
-
-            match data.read_to_end(&mut buffer) {
-                Ok(_) => {}
+        match data.open().read_to_end(&mut buffer) {
+            Ok(size) => info!("Data of size {} received", size),
             Err(e) => {
                 error!("Could not read to end of data: {}", &e);
                 return Failure((
@@ -158,21 +152,16 @@ impl FromDataSimple for Hooks {
             }
         }
 
-            trace!("Data received: {:?}", from_utf8(&buffer));
-
+        let config = request.guard::<State<Config>>().unwrap(); // should never fail
         let mut valid = false;
+        let mut hooks = HashMap::new();
 
         for (hook_name, hook) in &config.hooks {
-                let mut commands = Vec::new();
-
+            if let Some(signature) = request.headers().get_one(&hook.signature) {
                 for secret in &hook.secrets {
                     match validate_request(&secret, &signature, &buffer) {
                         Ok(()) => {
-                            trace!(
-                                "Valid signature found for hook `{}`: {}",
-                                hook_name,
-                                signature
-                            );
+                            trace!("Valid signature found for hook `{}`", hook_name,);
 
                             valid = true;
 
@@ -196,7 +185,10 @@ impl FromDataSimple for Hooks {
                                     &request,
                                     &data,
                                 ) {
-                                    Ok(Some(command)) => commands.push(command),
+                                    Ok(Some(command)) => {
+                                        hooks.insert(hook_name.to_string(), command);
+                                        break;
+                                    }
                                     Ok(None) => {}
                                     Err(e) => error!("{}", e),
                                 }
@@ -211,52 +203,33 @@ impl FromDataSimple for Hooks {
                         }
                     }
                 }
-
-                if !commands.is_empty() {
-                    hooks.insert(hook_name.to_string(), commands);
+            } else {
+                error!("Could not extract signature from header");
+                return Failure((
+                    Status::BadRequest,
+                    anyhow!("Could not extract signature from header"),
+                ));
             }
         }
 
         if hooks.is_empty() {
             if valid {
-                    warn!(
-                        "Unmatched hook from {:?} with signature {:?}",
-                        &request.client_ip(),
-                        &request.headers().get_one("X-Gitea-Signature")
-                    );
-                    Failure((
+                warn!("Unmatched hook from {:?}", &request.client_ip());
+                return Failure((
                     Status::NotFound,
-                        anyhow!(
-                            "Unmatched hook from {:?} with signature {:?}",
-                            &request.client_ip(),
-                            &request.headers().get_one("X-Gitea-Signature")
-                        ),
-                    ))
+                    anyhow!("Unmatched hook from {:?}", &request.client_ip()),
+                ));
             } else {
-                    warn!(
-                        "Unauthorized request from {:?} with signature {:?}",
-                        &request.client_ip(),
-                        &request.headers().get_one("X-Gitea-Signature")
-                    );
-                    Failure((
+                error!("Unauthorized request from {:?}", &request.client_ip());
+                return Failure((
                     Status::Unauthorized,
-                        anyhow!(
-                            "Unauthorized request from {:?} with signature {:?}",
-                            &request.client_ip(),
-                            &request.headers().get_one("X-Gitea-Signature")
-                        ),
-                    ))
+                    anyhow!("Unauthorized request from {:?}", &request.client_ip()),
+                ));
             }
-            } else {
+        }
+
         Success(Hooks(hooks))
     }
-        } else {
-            Failure((
-                Status::BadRequest,
-                anyhow!("Could not extract signature from header"),
-            ))
-        }
-    }
 }
 
 #[get("/")]
@@ -269,10 +242,9 @@ fn receive_hook<'a>(address: SocketAddr, hooks: Hooks) -> Result<Response<'a>> {
     info!("Post request received from: {}", address);
 
     for hook in hooks.0 {
-        for command in hook.1 {
-            info!("Execute `{}` from hook `{}`", &command, &hook.0);
+        info!("Execute `{}` from hook `{}`", &hook.1, &hook.0);
 
-            let command = command.split(' ').collect::<Vec<&str>>();
+        let command = hook.1.split(' ').collect::<Vec<&str>>();
         match Command::new(&command[0]).args(&command[1..]).output() {
             Ok(executed) => {
                 info!(
@@ -295,7 +267,6 @@ fn receive_hook<'a>(address: SocketAddr, hooks: Hooks) -> Result<Response<'a>> {
             }
         }
     }
-    }
 
     Ok(Response::new())
 }
@@ -373,6 +344,7 @@ mod tests {
             "test_hook".to_string(),
             Hook {
                 command: "".to_string(),
+                signature: "X-Gitea-Signature".to_string(),
                 secrets: vec!["valid".to_string()],
                 filters: HashMap::new(),
             },
@@ -497,6 +469,14 @@ mod tests {
             "   bar   command"
         );
 
-        // Add tests with header fields
+        assert_eq!(
+            replace_parameter(
+                "   {{ event }}   command",
+                &map,
+                &json!({ "field1": { "foo": "bar" } })
+            )
+            .unwrap(),
+            "   something   command"
+        );
     }
 }