commit 8e29aaaed23ebb08d50382f134a3d8c426450428 Author: Curle Date: Wed Mar 1 23:48:59 2023 +0000 Initial Commit. diff --git a/.gitattributes b/.gitattributes new file mode 100644 index 0000000..00a51af --- /dev/null +++ b/.gitattributes @@ -0,0 +1,6 @@ +# +# https://help.github.com/articles/dealing-with-line-endings/ +# +# These are explicitly windows files and should use crlf +*.bat text eol=crlf + diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..1b6985c --- /dev/null +++ b/.gitignore @@ -0,0 +1,5 @@ +# Ignore Gradle project-specific cache directory +.gradle + +# Ignore Gradle build output directory +build diff --git a/.vscode/launch.json b/.vscode/launch.json new file mode 100644 index 0000000..25658c4 --- /dev/null +++ b/.vscode/launch.json @@ -0,0 +1,21 @@ +{ + // Use IntelliSense to learn about possible attributes. + // Hover to view descriptions of existing attributes. + // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387 + "version": "0.2.0", + "configurations": [ + { + "type": "java", + "name": "Current File", + "request": "launch", + "mainClass": "${file}" + }, + { + "type": "java", + "name": "App", + "request": "launch", + "mainClass": "butler.App", + "projectName": "app" + } + ] +} \ No newline at end of file diff --git a/.vscode/settings.json b/.vscode/settings.json new file mode 100644 index 0000000..c5f3f6b --- /dev/null +++ b/.vscode/settings.json @@ -0,0 +1,3 @@ +{ + "java.configuration.updateBuildConfiguration": "interactive" +} \ No newline at end of file diff --git a/app/bin/main/butler/App$WebhookHandler.class b/app/bin/main/butler/App$WebhookHandler.class new file mode 100644 index 0000000..e22f47f Binary files /dev/null and b/app/bin/main/butler/App$WebhookHandler.class differ diff --git a/app/bin/main/butler/App.class b/app/bin/main/butler/App.class new file mode 100644 index 0000000..8c3fe07 Binary files /dev/null and b/app/bin/main/butler/App.class differ diff --git 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b/app/bin/main/butler/source/SourceData.class differ diff --git a/app/bin/test/butler/AppTest.class b/app/bin/test/butler/AppTest.class new file mode 100644 index 0000000..92f2d92 Binary files /dev/null and b/app/bin/test/butler/AppTest.class differ diff --git a/app/build.gradle b/app/build.gradle new file mode 100644 index 0000000..24e894e --- /dev/null +++ b/app/build.gradle @@ -0,0 +1,50 @@ +/* + * This file was generated by the Gradle 'init' task. + * + * This generated file contains a sample Java application project to get you started. + * For more details take a look at the 'Building Java & JVM projects' chapter in the Gradle + * User Manual available at https://docs.gradle.org/7.3/userguide/building_java_projects.html + */ + +plugins { + // Apply the application plugin to add support for building a CLI application in Java. + id 'application' +} + +java { + toolchain { + languageVersion = JavaLanguageVersion.of(17) + } +} + +repositories { + // Use Maven Central for resolving dependencies. + mavenCentral() + maven { + url 'https://dogforce-games.com/maven' + } +} + +dependencies { + // Use JUnit Jupiter for testing. + testImplementation 'org.junit.jupiter:junit-jupiter:5.7.2' + + // This dependency is used by the application. + implementation 'net.sf.jopt-simple:jopt-simple:5.0.4' + implementation 'org.apache.logging.log4j:log4j-api:2.20.0' + implementation 'org.apache.logging.log4j:log4j-core:2.20.0' + + implementation 'com.github.jgonian:commons-ip-math:1.32' + + implementation 'dev.gigaherz.util.gddl:gddl2:2.0.0-alpha.2' +} + +application { + // Define the main class for the application. + mainClass = 'butler.App' +} + +tasks.named('test') { + // Use JUnit Platform for unit tests. + useJUnitPlatform() +} diff --git a/app/src/main/java/butler/App.java b/app/src/main/java/butler/App.java new file mode 100644 index 0000000..1dd6f5c --- /dev/null +++ b/app/src/main/java/butler/App.java @@ -0,0 +1,321 @@ +package butler; + +import java.io.IOException; +import java.net.InetSocketAddress; +import java.util.ArrayList; +import java.util.List; +import java.util.concurrent.Executors; +import java.util.concurrent.ThreadPoolExecutor; + +import com.sun.net.httpserver.HttpServer; + +import butler.rule.Rule; +import butler.source.SourceData; +import joptsimple.OptionParser; +import joptsimple.OptionSet; + +import com.sun.net.httpserver.HttpExchange; +import com.sun.net.httpserver.HttpHandler; + +import org.apache.logging.log4j.Logger; +import org.apache.logging.log4j.core.config.Configurator; +import org.apache.logging.log4j.Level; +import org.apache.logging.log4j.LogManager; + +import dev.gigaherz.util.gddl2.GDDL; +import dev.gigaherz.util.gddl2.exceptions.ParserException; +import dev.gigaherz.util.gddl2.structure.GddlDocument; +import dev.gigaherz.util.gddl2.structure.GddlElement; +import dev.gigaherz.util.gddl2.structure.GddlList; +import dev.gigaherz.util.gddl2.structure.GddlMap; + +/**************** + * + * Butler + * A webhook filtering and forwarding tool + * + **************** + * + * Behaviour is completely configuration-driven. + * + * The configuration allows you to specify the listening port and URL, as well as an array of rules. + * Rules determine what to do when an incoming webhook is received. + * + * Rules have two components; a list of filters, and a list of actions. + * Filters: + * - Allow you to narrow rules down to their source + * - Allow you to narrow rules down by webhook content + * - Allow you to narrow rules down by (optionally) the context sent by a Github Hookshot. + * + * Actions: + * - Allow you to rewrite webhook content + * - Allow you to forward a webhook via a different URL + * - Allow you to block a webhook so that it is not sent on + * + * Combined, this means that you can create rules that separate organization-wide Github webhooks to multiple Discord channels + * (the reason this project exists) + * or to simply not allow certain webhooks to be sent. + * + **************** + * + * An example rule is provided that redirects Github Webhooks for the TheCurle/butler repository to example.com: + * ``` + * { + * rules: [ + * rule { + * name: "TheCurle/Butler to example.com", + * filters: [ + * source { origin: "github.com" } + * github { user: "TheCurle", repo: "butler" } + * ] + * actions: { + * forward { url: "example.com/" } + * } + * } + * ] + * } + * ``` + * + * An example rule is provided that prevents a custom webhook containing the word "milk" from being forwarded. + * ``` + * { + * rules: [ + * rule { + * name: "filter out milk", + * filters: [ + * content { str: "milk" } + * ] + * actions: [ + * reject {} + * ] + * } + * ] + * } + * ``` + * + **************** + * + * Rules and Names + * + * Rules are required to have names. + * This is an intentional decision designed to make it easier to navigate large configuration files with lots of rules. + * By string-searching the effect that a rule has, you can find the exact code that makes it happen. + * + * This is designed to put maintenance and longevity of the system first, though can seem like a strange and arbitrary decision at first. + * + **************** + * + * Filter and Action Types + * + * Since filters and actions can have different parameters depending on what the type is, the type must be specified before any further parsing. + * This allows for an interesting kind of "dynamic dispatch", where the rest of the rule is parsed based on the type given. + * + * Eventually this will allow for custom types to be specified in addon code, but this is a very far-future idea. + * + **************** + * + * Filtering Conditions + * + * Two "types" of filtering conditions are provided; source and content, with an extra GitHub integration provided. + * + * Source: + * - will attempt to match the URL where the webhook originated. + * the shortcut "github" is provided that matches a user-agent of "Github-Hookshot". + * other content is taken as a substring of the incoming URL. + * for example, if the remote IP has a R-DNS resolution, it will match that. + * Otherwise, the IP is matched directly. + * Content: + * - will attempt to match a substring of the webhook content. + * GitHub: + * github sources have a few shorthands: + * - "repository": matches the NAME of the repository that relates to this Github webhook + * - "user": matches the USER that OWNS THE REPOSITORY that relates to this Github webhook + * - "sender": matches the USER that TRIGGERED this Github webhook + * as an example, the user "octocat" pushing to "torvalds/linux" will have linux as the repository, torvalds as the user, and octocat as the sender. + * + **************** + * + * Actions + * + * There are three main types of action: rewrite, forward, reject. + * + * Rewrite: + * - will replace all instances of a string in the JSON body with another string. + * Forward: + * - will send the webhook as-is to another URL (with an X-Proxy header added) + * Reject: + * - will reject the webhook and close the connection with a 403. + * + */ + +public class App { + + public static String version = "1.0f"; + + private static int DEFAULT_PORT = 6000; + private static String DEFAULT_CONFIG_PATH = "./config.gddl"; + + // The Web server listening for incoming webhook requests + private HttpServer server; + private ThreadPoolExecutor executor; + + // The instance of the HttpHandler that actually redirects the webhooks. + private WebhookHandler handler; + + // The configuration file set by the user, read once at read. + private GddlDocument config; + // The list of rules that set how the program should react to an incoming webhook. + private List rules; + + // The logger for this class + private static Logger logger = LogManager.getLogger(App.class); + + public App(OptionSet options) { + int port = options.has("port") ? (int) options.valueOf("port") : + DEFAULT_PORT; + try { + server = HttpServer.create(new InetSocketAddress("localhost", port), 0); + } catch (IOException e) { + logger.error("[INIT] Failed to bind to port {}, aborting.", port); + System.exit(1); + } + + String path = options.has("config") ? (String) options.valueOf("config") : + DEFAULT_CONFIG_PATH; + try { + config = GDDL.fromFile(path); + parseConfig(); + } catch (ParserException | IOException e) { + logger.error("[INIT] Failed to load configuration file at path {}, aborting.", path); + System.exit(2); + } + + executor = (ThreadPoolExecutor) Executors.newFixedThreadPool(5); + handler = new WebhookHandler(); + + logger.info("[INIT] Registering handler for all incoming webhooks."); + server.createContext("/", handler); + server.setExecutor(executor); + } + + public void begin() { + server.start(); + } + + private void parseSources(List list, GddlElement entry) { + logger.info("[CONF] Reading Sources list.."); + if (!entry.isList()) { + logger.error("[CONF] Sources should be a list. Aborting.."); + System.exit(11); + } + + GddlList sources = entry.asList(); + sources.forEach(source -> { + if (!source.isMap() || source.asMap().hasTypeName() || source.asMap().getTypeName() != "source") { + logger.error("[CONF] Source entry should be a map with type \"source\". Aborting."); + System.exit(12); + } + + SourceData data = SourceData.from(source); + logger.info("[CONF] Adding source {} to list of known hosts.", data.host()); + list.add(data); + }); + } + + private void parseRules(List rules, List sources, GddlElement entry) { + logger.info("[CONF] Reading Rules list.."); + + if (!entry.isList()) { + logger.error("[CONF] Rules should be a list. Aborting..."); + System.exit(17); + } + + GddlList list = entry.asList(); + list.forEach(rule -> { + if (!rule.isMap() || !rule.asMap().hasTypeName() || !rule.asMap().getTypeName().equals("rule")) { + logger.error("[CONF] Rules entry should be a map with type \"rule\". Aborting."); + System.exit(18); + } + + Rule data = Rule.from(rule, sources); + logger.info("[CONF] Adding rule {} to list of active rules.", data.getName()); + rules.add(data); + }); + } + + private void parseConfig() { + GddlElement root = config.getRoot(); + if (!root.isMap() || !root.asMap().containsKey("rules") || !root.asMap().containsKey("sources")) { + logger.error("[INIT] Malformed configuration file! The root element should be a map of rules and sources."); + System.exit(3); + } + + GddlMap cfgList = root.asMap(); + rules = new ArrayList(); + + List sources = new ArrayList<>(); + cfgList.forEach((key, entry) -> { + if (key.equals("sources")) { + parseSources(sources, entry); + } else if (key.equals("rules")) { + parseRules(rules, sources, entry); + } else { + logger.error("[CONF] Unknown entry {} in configuration map. Aborting..", key); + System.exit(10); + } + }); + } + + public static void main(String[] args) { + Configurator.setAllLevels(LogManager.getRootLogger().getName(), Level.INFO); + logger.info("[INIT] Butler v{} starting.", version); + + OptionParser parser = new OptionParser(); + parser.accepts("port").withRequiredArg().ofType(Integer.class); + parser.accepts("config").withRequiredArg(); + + OptionSet opts = parser.parse(args); + + App app = new App(opts); + + int port = opts.has("port") ? (int) opts.valueOf("port") : + DEFAULT_PORT; + + logger.info("[CORE] Listening for webhooks on port {}.", port); + app.begin(); + } + + /** + * The class that actually handles redirecting the webhooks. + * When a new request is received, the handle method is called. + * If the request is a GET, a 403 is returned. + * If the request is a PUT, it is handled as per the config. + * Generally, the webhook is ignored unless a specific flag is set, in which case it is modified and redirected to another server. + * This allows for easy webhook filtering and querying. + */ + class WebhookHandler implements HttpHandler { + + @Override + public void handle(HttpExchange exchange) throws IOException { + logger.debug("[NETW] Incoming Request. {}:{}, from {}.", exchange.getRequestMethod(), exchange.getRequestURI(), exchange.getRemoteAddress()); + if (exchange.getRequestMethod().equals("GET")) { + logger.info("[NETW] Refusing GET request from {}.", exchange.getRemoteAddress()); + exchange.sendResponseHeaders(403, 0); + } else if (exchange.getRequestMethod().equals("POST")) { + logger.info("[NETW] POST from {}.", exchange.getRemoteAddress()); + + for (Rule rule : rules) { + logger.trace("[RULE] Testing rule {} against POST from {}.", rule.getName(), exchange.getRemoteAddress()); + if (rule.tryFilters(exchange)) { + logger.info("[RULE] Rule {} matched. Applying actions.", rule.getName()); + if (!rule.applyActions(exchange)) + return; + } + } + + exchange.sendResponseHeaders(200, 0); + exchange.close(); + } + } + } +} diff --git a/app/src/main/java/butler/action/Action.java b/app/src/main/java/butler/action/Action.java new file mode 100644 index 0000000..ea7b485 --- /dev/null +++ b/app/src/main/java/butler/action/Action.java @@ -0,0 +1,10 @@ +package butler.action; + +import com.sun.net.httpserver.HttpExchange; + +public interface Action { + /** + * Perform the given action against the given HttpExchange. + */ + boolean perform(HttpExchange exc); +} diff --git a/app/src/main/java/butler/action/ForwardAction.java b/app/src/main/java/butler/action/ForwardAction.java new file mode 100644 index 0000000..6b80715 --- /dev/null +++ b/app/src/main/java/butler/action/ForwardAction.java @@ -0,0 +1,109 @@ +package butler.action; + +import java.io.BufferedReader; +import java.io.ByteArrayOutputStream; +import java.io.DataOutputStream; +import java.io.IOException; +import java.io.InputStreamReader; +import java.io.UnsupportedEncodingException; +import java.net.HttpURLConnection; +import java.net.MalformedURLException; +import java.net.ProtocolException; +import java.net.URL; + +import org.apache.logging.log4j.LogManager; +import org.apache.logging.log4j.Logger; + +import com.sun.net.httpserver.HttpExchange; + +import butler.App; +import dev.gigaherz.util.gddl2.structure.GddlMap; + +/** + * Takes the webhook headers and content, and sends it on to another URL. + * An X-Proxy header is added with the value of "Butler" followed by the version number. + */ +public class ForwardAction implements Action { + private Logger logger = LogManager.getLogger(ForwardAction.class); + private String url; + + public ForwardAction(GddlMap map) { + url = map.values().stream().findFirst().get().stringValue(); + } + + @Override + public boolean perform(HttpExchange exc) { + + logger.info("[NETW] Redirecting request from {} (target {}) to {}.", exc.getRemoteAddress().getHostString(), exc.getLocalAddress().getHostName(), url); + + ByteArrayOutputStream result = new ByteArrayOutputStream(); + byte[] buffer = new byte[1024]; + + try { + for (int length; (length = exc.getRequestBody().read(buffer)) != -1; ) { + result.write(buffer, 0, length); + } + } catch (IOException e) { + logger.error("[NETW] Unable to read request body for request from {}. Aborting.", exc.getRemoteAddress().getHostString()); + return false; + } + String content; + try { + content = result.toString("UTF-8"); + } catch (UnsupportedEncodingException e) { + logger.error("[NETW] Unable to read request body for request from {}. Aborting.", exc.getRemoteAddress().getHostString()); + return false; + } + + URL req; + HttpURLConnection conn; + + try { + req = new URL(url); + } catch (MalformedURLException e) { + logger.error("[NETW] Unable to parse destination url {}. Aborting.", url); + return false; + } + + try { + conn = (HttpURLConnection) req.openConnection(); + } catch (IOException e) { + logger.error("[NETW] Unable to open a connection to {}. Aborting.", url); + return false; + } + + try { + conn.setRequestMethod("POST"); + exc.getRequestHeaders().forEach((name, val) -> conn.setRequestProperty(name, val.get(0))); + conn.setRequestProperty("X-Proxy", "Butler " + App.version); + } catch (ProtocolException e) { + logger.error("[NETW] Unable to set request method. Java is broken??"); + return false; + } + conn.setDoOutput(true); + + DataOutputStream out; + try { + conn.setFixedLengthStreamingMode(content.length()); + conn.connect(); + out = new DataOutputStream(conn.getOutputStream()); + out.write(content.getBytes()); + } catch (IOException e) { + logger.error("[NETW] Unable to send a request to target url {}. Aborting.", url); + return false; + } + + try (BufferedReader res = new BufferedReader(new InputStreamReader(conn.getInputStream()))) { + StringBuilder sb = new StringBuilder(); + String line; + while ((line = res.readLine()) != null) + sb.append(line); + + logger.trace("[NETW] POST to {} returned string {}.", url, sb.toString()); + } catch (IOException e) { + logger.error("[NETW] Failed to read response from {}. Aborting.", url); + System.exit(37); + } + return true; + } +} diff --git a/app/src/main/java/butler/action/RejectAction.java b/app/src/main/java/butler/action/RejectAction.java new file mode 100644 index 0000000..d83cdd6 --- /dev/null +++ b/app/src/main/java/butler/action/RejectAction.java @@ -0,0 +1,23 @@ +package butler.action; + +import com.sun.net.httpserver.HttpExchange; + +import butler.rule.Rule; +import dev.gigaherz.util.gddl2.structure.GddlMap; + +/** + * An action that rejects the given webhook. + * Allows active rejection (ie. block IP ranges from making otherwise valid requests). + */ +public class RejectAction implements Action { + + public RejectAction(GddlMap entry) { + } + + @Override + public boolean perform(HttpExchange exc) { + Rule.logger.info("[RULE] Rejecting POST from {}.", exc.getRemoteAddress()); + exc.close(); + return false; + } +} diff --git a/app/src/main/java/butler/filter/Filter.java b/app/src/main/java/butler/filter/Filter.java new file mode 100644 index 0000000..acf2ec9 --- /dev/null +++ b/app/src/main/java/butler/filter/Filter.java @@ -0,0 +1,13 @@ +package butler.filter; + +import com.sun.net.httpserver.HttpExchange; + +public interface Filter { + + /** + * Run the filter against the given HTTP request. + * @param exchange an in-progress HTTP request with all context given. + * @return whether or not the filter matched the request + */ + boolean test(HttpExchange exchange); +} diff --git a/app/src/main/java/butler/filter/FilterContent.java b/app/src/main/java/butler/filter/FilterContent.java new file mode 100644 index 0000000..a138831 --- /dev/null +++ b/app/src/main/java/butler/filter/FilterContent.java @@ -0,0 +1,32 @@ +package butler.filter; + +import java.io.BufferedReader; +import java.io.InputStreamReader; +import java.util.List; +import java.util.stream.Collectors; + +import com.sun.net.httpserver.HttpExchange; + +import butler.rule.Rule; +import butler.source.SourceData; +import dev.gigaherz.util.gddl2.structure.GddlMap; + +/** + * Matches the content of the request body against a given string. + */ +public class FilterContent implements Filter { + + private String content = ""; + + public FilterContent(GddlMap map, List sources) { + content = map.values().stream().findFirst().get().stringValue(); + } + + @Override + public boolean test(HttpExchange exchange) { + Rule.logger.trace("[RULE] Testing content of request against {}.", content); + String body = new BufferedReader(new InputStreamReader(exchange.getRequestBody())).lines().collect(Collectors.joining("\n")); + return body.contains(content); + } + +} diff --git a/app/src/main/java/butler/filter/FilterGithub.java b/app/src/main/java/butler/filter/FilterGithub.java new file mode 100644 index 0000000..7010397 --- /dev/null +++ b/app/src/main/java/butler/filter/FilterGithub.java @@ -0,0 +1,107 @@ +package butler.filter; + +import java.io.IOException; +import java.util.List; + +import org.apache.logging.log4j.LogManager; +import org.apache.logging.log4j.Logger; + +import com.sun.net.httpserver.HttpExchange; + +import butler.source.SourceData; +import dev.gigaherz.util.gddl2.GDDL; +import dev.gigaherz.util.gddl2.exceptions.ParserException; +import dev.gigaherz.util.gddl2.structure.GddlDocument; +import dev.gigaherz.util.gddl2.structure.GddlMap; + +/** + * A Github filter. + * Allows matching by user/repository, sender, and string content of the webhook. + */ +public class FilterGithub implements Filter { + private Logger logger = LogManager.getLogger(FilterGithub.class); + + private String user = ""; + private String sender = ""; + private String repo = ""; + private String action = ""; + private String content = ""; + + public FilterGithub(GddlMap map, List sources) { + if (map.containsKey("user")) + user = map.get("user").stringValue(); + if (map.containsKey("sender")) + sender = map.get("sender").stringValue(); + if (map.containsKey("repo")) + repo = map.get("repo").stringValue(); + if (map.containsKey("action")) + action = map.get("action").stringValue(); + if (map.containsKey("content")) + content = map.get("content").stringValue(); + } + + @Override + public boolean test(HttpExchange exc) { + GddlDocument gddl; + + try { + gddl = GDDL.fromStream(exc.getRequestBody()); + } catch (ParserException | IOException e) { + logger.error("[RULE] Unable to read JSON content for Github Filter on request from {}. Aborting.", exc.getRemoteAddress()); + return false; + } + + GddlMap map = gddl.getRoot().asMap(); + + if (action.length() > 0) { + logger.trace("[RULE] Testing GitHub webhook action.."); + List fields = List.of(action.split("/")[0].split(",")); + String ctx = action.split("/")[1]; + logger.trace("[RULE] Searching for an action {} on {}.", ctx, fields); + + for (String field : fields) { + if (!map.containsKey(field)) { + logger.trace("[RULE] Webhook does not contain field {}, skipping.", field); + return false; + } + } + + if (!map.get("action").stringValue().equals(ctx)) { + logger.trace("[RULE] Webhook is not applying to action {}, skipping.", ctx); + } + } + + if (sender.length() > 0) { + logger.trace("[RULE] Testing Github webhook user.."); + String senderLogin = map.get("sender").asMap().get("login").stringValue(); + if (!senderLogin.equals(sender)) { + logger.trace("[RULE] GitHub webhook sender {} does not match specified user {}, skipping..", senderLogin, sender); + return false; + } + } + + if (repo.length() > 0) { + logger.trace("[RULE] Testing Github webhook repository.."); + String repositoryName = map.get("repository").asMap().get("name").stringValue(); + if (!repositoryName.equals(repo)) { + logger.trace("[RULE] GitHub webhook repository {} does not match specified repo {}, skipping.", repositoryName, repo); + return false; + } + + if (user.length() > 0) { + String repositoryFullName = map.get("repository").asMap().get("full_name").stringValue(); + if (!(user + "/" + repositoryName).equals(repositoryFullName)) { + logger.trace("[RULE] GitHub webhook repository {} does not belong to specified user {}, skipping", repositoryFullName, user); + } + } + } + + if (content.length() > 0) { + logger.warn("[RULE] Github Content filter is unsupported. Skipping."); + } + + + return true; + } + +} diff --git a/app/src/main/java/butler/filter/FilterSource.java b/app/src/main/java/butler/filter/FilterSource.java new file mode 100644 index 0000000..c3d2a82 --- /dev/null +++ b/app/src/main/java/butler/filter/FilterSource.java @@ -0,0 +1,51 @@ +package butler.filter; + +import java.util.List; + +import com.sun.net.httpserver.HttpExchange; + +import butler.source.SourceData; +import dev.gigaherz.util.gddl2.structure.GddlMap; + +/** + * Filter by the source of the webhook. + * The remote address of the request is checked agains the content of the Source Filter. + * Optionally, if the source is a domain, then it is resolved and checked against the incoming URL. + * If a match is found, then the associated action is triggered. + */ +public class FilterSource implements Filter { + private String origin; + private List sources; + + public FilterSource(GddlMap data, List knownSources) { + // The origin can be under any name, but it must be the first (and only) entry in the filter. + origin = data.values().stream().findFirst().get().stringValue(); + sources = knownSources; + } + + public boolean test(HttpExchange exc) { + // Match the literal address, if given. + String addr = exc.getRemoteAddress().getAddress().getHostAddress(); + if (origin.equals(addr)) + return true; + + // If a Reverse DNS ip can be resolved, try that. + String host = exc.getRemoteAddress().getHostName(); + if (!host.equals(addr) && host.equals(origin)) + return true; + + // Also match the Host header. + if (exc.getRequestHeaders().get("Host").get(0).equals(origin)) + return true; + + for (SourceData source : sources) { + // If the literal address doesn't match, try it as a host/nickname in the list of known sources. + if (origin.equals(source.host())) { + return source.test(exc.getRemoteAddress().getHostName()); + } + } + + return false; + } + +} diff --git a/app/src/main/java/butler/rule/Rule.java b/app/src/main/java/butler/rule/Rule.java new file mode 100644 index 0000000..7e0434b --- /dev/null +++ b/app/src/main/java/butler/rule/Rule.java @@ -0,0 +1,190 @@ +package butler.rule; + +import java.lang.reflect.Constructor; +import java.lang.reflect.InvocationTargetException; +import java.util.ArrayList; +import java.util.List; + +import org.apache.logging.log4j.LogManager; +import org.apache.logging.log4j.Logger; + +import butler.action.Action; +import butler.filter.Filter; +import butler.source.SourceData; +import dev.gigaherz.util.gddl2.structure.GddlElement; +import dev.gigaherz.util.gddl2.structure.GddlList; +import dev.gigaherz.util.gddl2.structure.GddlMap; + +import com.sun.net.httpserver.HttpExchange; + +/** + * The core class that encodes the information of a redirect rule. + * A rule contains: + * - A name (for easy identification) + * - A set of conditions (if all are matched, the action is performed) + * - A set of actions + * + * Actions are performed in order; so if a request is dropped and then redirected, the redirect will fail. + * + */ +public class Rule { + // The name of this rule + private String name; + // The list of filters that specify whether the current rule should apply + private List filters; + // The list of actions that should be executed when the current rule applies + private List actions; + + public static Logger logger = LogManager.getLogger(Rule.class); + + public Rule(String name, List filters, List actions) { + this.name = name; + this.filters = filters; + this.actions = actions; + } + + public String getName() { + return name; + } + + /** + * Try all the filters in the rule against the given exchange. + * @param exc an active HttpExchange for an incoming webhook request. + * @return false if any filter failed, true if all filters matched. + */ + public boolean tryFilters(HttpExchange exc) { + for (Filter filter : filters) { + logger.trace("[RULE] ({}) Trying filter {} against {}.", name, filter.getClass().getSimpleName(), exc.getRemoteAddress()); + if (!filter.test(exc)) { + logger.trace("[RULE] Filter failed."); + return false; + } + } + + logger.trace("[RULE] All filters passed for rule {}.", name); + return true; + } + + /** + * Apply all relevant actions of the rule against the given exchange. + */ + public boolean applyActions(HttpExchange exc) { + for (Action action : actions) { + logger.trace("[RULE] ({}) Applying action {} for request from {}.", name, action.getClass().getSimpleName(), exc.getRemoteAddress().getHostName()); + // Terminal actions return false; stop processing if that happens. + if (!action.perform(exc)) + return false; + } + return true; + } + + public static Rule from(GddlElement entry, List sources) { + GddlMap map = entry.asMap(); + if (!map.containsKey("name")) { + Rule.logger.error("[CONF] Rules must have a name. Aborting.."); + System.exit(4); + } + + String name = map.get("name").asValue().stringValue(); + + if (!map.containsKey("filters") && !map.get("filters").isList() ) { + Rule.logger.error("[CONF] Rule {} must have a list of filters. Aborting..", name); + System.exit(5); + } + + List filters = new ArrayList<>(); + GddlList filterList = map.get("filters").asList(); + filterList.forEach(listEntry -> { + if (!listEntry.isMap()) { + Rule.logger.error("[CONF] Entry in the filters list is not a Map. Aborting.."); + System.exit(6); + } + + GddlMap eMap = listEntry.asMap(); + if (!eMap.hasTypeName()) { + Rule.logger.error("[CONF] Entry in the filters list does not have a type. Aborting.."); + System.exit(7); + } + + String filterType = eMap.getTypeName(); + String filterClassName = "butler.filter.Filter" + filterType.substring(0, 1).toUpperCase() + filterType.substring(1); + try { + Class filterClass = Class.forName(filterClassName); + Constructor filterCtor = filterClass.getConstructor(GddlMap.class, List.class); + filters.add((Filter) filterCtor.newInstance(eMap, (List) sources)); + } catch (ClassNotFoundException e) { + Rule.logger.error("[CONF] Filter type {} resolves to {}.class, which does not exist. Aborting..", filterType, filterClassName); + System.exit(8); + } catch (NoSuchMethodException e) { + Rule.logger.error("[CONF] Filter type {} resolves to {}.class, which does not have the correct constructor (String,List). Aborting..", filterType, filterClassName); + System.exit(20); + } catch (SecurityException e) { + Rule.logger.error("[CONF] Filter type {} resolves to {}.class, which could not be instantiated ({}). Aborting..", filterType, filterClassName, e.getMessage()); + System.exit(21); + } catch (InstantiationException e) { + Rule.logger.error("[CONF] Filter type {} resolves to {}.class, which could not be instantiated ({}). Aborting..", filterType, filterClassName, e.getMessage()); + System.exit(22); + } catch (IllegalAccessException e) { + Rule.logger.error("[CONF] Filter type {} resolves to {}.class, which could not be instantiated ({}). Aborting..", filterType, filterClassName, e.getMessage()); + System.exit(23); + } catch (IllegalArgumentException e) { + Rule.logger.error("[CONF] Filter type {} resolves to {}.class, which could not be instantiated ({}). Aborting..", filterType, filterClassName, e.getMessage()); + System.exit(24); + } catch (InvocationTargetException e) { + Rule.logger.error("[CONF] Filter type {} resolves to {}.class, which could not be instantiated ({}). Aborting..", filterType, filterClassName, e.getMessage()); + System.exit(25); + } + }); + + if (!map.containsKey("actions") && !map.get("actions").isList() ) { + Rule.logger.error("[CONF] Rule {} must have a list of actions. Aborting.."); + System.exit(26); + } + + List actions = new ArrayList<>(); + GddlList actionList = map.get("actions").asList(); + actionList.forEach(listEntry -> { + if (!listEntry.isMap()) { + Rule.logger.error("[CONF] Entry in the actions list is not a Map. Aborting.."); + System.exit(27); + } + + GddlMap aMap = listEntry.asMap(); + if (!aMap.hasTypeName()) { + Rule.logger.error("[CONF] Entry in the actions list does not have a type. Aborting.."); + System.exit(28); + } + + String actionType = aMap.getTypeName(); + String actionClassName = "butler.action." + actionType.substring(0, 1).toUpperCase() + actionType.substring(1) + "Action"; + try { + Class actionClass = Class.forName(actionClassName); + Constructor actionCtor = actionClass.getConstructor(GddlMap.class); + actions.add((Action) actionCtor.newInstance(aMap)); + } catch (ClassNotFoundException e) { + Rule.logger.error("[CONF] Action type {} resolves to {}.class, which does not exist. Aborting..", actionType, actionClassName); + System.exit(29); + } catch (NoSuchMethodException e) { + Rule.logger.error("[CONF] Action type {} resolves to {}.class, which does not have the correct constructor (String). Aborting..", actionType, actionClassName); + System.exit(30); + } catch (SecurityException e) { + Rule.logger.error("[CONF] Action type {} resolves to {}.class, which could not be instantiated. Aborting..", actionType, actionClassName); + System.exit(31); + } catch (InstantiationException e) { + Rule.logger.error("[CONF] Action type {} resolves to {}.class, which could not be instantiated. Aborting..", actionType, actionClassName); + System.exit(32); + } catch (IllegalAccessException e) { + Rule.logger.error("[CONF] Action type {} resolves to {}.class, which could not be instantiated. Aborting..", actionType, actionClassName); + System.exit(33); + } catch (IllegalArgumentException e) { + Rule.logger.error("[CONF] Action type {} resolves to {}.class, which could not be instantiated. Aborting..", actionType, actionClassName); + System.exit(34); + } catch (InvocationTargetException e) { + Rule.logger.error("[CONF] Action type {} resolves to {}.class, which could not be instantiated. Aborting..", actionType, actionClassName); + System.exit(35); + } + }); + + return new Rule(name, filters, actions); + } +} diff --git a/app/src/main/java/butler/source/SourceData.java b/app/src/main/java/butler/source/SourceData.java new file mode 100644 index 0000000..b1b4ec0 --- /dev/null +++ b/app/src/main/java/butler/source/SourceData.java @@ -0,0 +1,74 @@ +package butler.source; + +import java.util.ArrayList; +import java.util.List; + +import com.github.jgonian.ipmath.Ipv4; +import com.github.jgonian.ipmath.Ipv4Range; + +import butler.rule.Rule; +import dev.gigaherz.util.gddl2.structure.GddlElement; +import dev.gigaherz.util.gddl2.structure.GddlList; +import dev.gigaherz.util.gddl2.structure.GddlMap; + +/** + * Provides a list of data that can be used to identify webhook sources. + * They are provided in config by a list of strings of form x.y.z.w/a, which encodes a subnet. + * These are mapped to a single domain by name, or alternatively to a nickname. + * + */ +public record SourceData(String host, List subnets) { + + public boolean test(String ip) { + for (String subnet : subnets) { + if (Ipv4Range.from(subnet.split("/")[0]).andPrefixLength(subnet.split("/")[1]).contains(Ipv4.of(ip))) + return true; + } + + return false; + } + + /** + * Create a SourceData from the given GddlMap. + * @param source the GddlMap of a single entry in the "sources" list of the configuration file. + * @return the SourceData representing the single entry given. + */ + public static SourceData from(GddlElement entry) { + if (!entry.isMap()) { + Rule.logger.error("Sources list entry is not a map. Aborting.."); + System.exit(36); + } + + GddlMap source = entry.asMap(); + + if (!source.containsKey("host") || source.containsKey("ranges")) { + Rule.logger.error("Source map should contain a host string and a list of ranges. Aborting.."); + System.exit(13); + } + + if (!source.get("host").isString()) { + Rule.logger.error("Source host should be a string. Aborting.."); + System.exit(14); + } + + if (!source.get("ranges").isList() || source.get("ranges").asList().size() == 0 || !source.get("ranges").asList().get(0).isString()) { + Rule.logger.error("Source ranges should be a non-empty list of Strings. Aborting.."); + System.exit(15); + } + + String host = source.get("host").stringValue(); + List addresses = new ArrayList<>(); + GddlList ranges = source.get("ranges").asList(); + ranges.forEach(range -> { + if (!range.isString()) { + Rule.logger.error("Source range entry should be a string. Aborting.."); + System.exit(16); + } + + addresses.add(range.stringValue()); + }); + + return new SourceData(host, addresses); + } + +} diff --git a/app/src/test/java/butler/AppTest.java b/app/src/test/java/butler/AppTest.java new file mode 100644 index 0000000..dbb0e7e --- /dev/null +++ b/app/src/test/java/butler/AppTest.java @@ -0,0 +1,12 @@ +/* + * This Java source file was generated by the Gradle 'init' task. + */ +package butler; + +import org.junit.jupiter.api.Test; +import static org.junit.jupiter.api.Assertions.*; + +class AppTest { + @Test void appHasAGreeting() { + } +} diff --git a/config.gddl b/config.gddl new file mode 100644 index 0000000..0da256e --- /dev/null +++ b/config.gddl @@ -0,0 +1,23 @@ +{ + sources: [] + rules: [ + rule { + name: "Not in my Christian Minecraft server!", + filters: [ + content { str: "poo" } + ] + actions: [ + reject {} + ] + } + rule { + name: "Test", + filters: [ + source { url: "127.0.0.1" } + ] + actions: [ + forward { url: "https://webhook.site/bd2e20cf-6b52-4134-8387-8b6107455b77" } + ] + } + ] +} \ No newline at end of file diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar new file mode 100644 index 0000000..7454180 Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties new file mode 100644 index 0000000..e750102 --- /dev/null +++ b/gradle/wrapper/gradle-wrapper.properties @@ -0,0 +1,5 @@ +distributionBase=GRADLE_USER_HOME +distributionPath=wrapper/dists +distributionUrl=https\://services.gradle.org/distributions/gradle-7.3-bin.zip +zipStoreBase=GRADLE_USER_HOME +zipStorePath=wrapper/dists diff --git a/gradlew b/gradlew new file mode 100755 index 0000000..1b6c787 --- /dev/null +++ b/gradlew @@ -0,0 +1,234 @@ +#!/bin/sh + +# +# Copyright © 2015-2021 the original authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# https://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# + +############################################################################## +# +# Gradle start up script for POSIX generated by Gradle. +# +# Important for running: +# +# (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is +# noncompliant, but you have some other compliant shell such as ksh or +# bash, then to run this script, type that shell name before the whole +# command line, like: +# +# ksh Gradle +# +# Busybox and similar reduced shells will NOT work, because this script +# requires all of these POSIX shell features: +# * functions; +# * expansions «$var», «${var}», «${var:-default}», «${var+SET}», +# «${var#prefix}», «${var%suffix}», and «$( cmd )»; +# * compound commands having a testable exit status, especially «case»; +# * various built-in commands including «command», «set», and «ulimit». +# +# Important for patching: +# +# (2) This script targets any POSIX shell, so it avoids extensions provided +# by Bash, Ksh, etc; in particular arrays are avoided. +# +# The "traditional" practice of packing multiple parameters into a +# space-separated string is a well documented source of bugs and security +# problems, so this is (mostly) avoided, by progressively accumulating +# options in "$@", and eventually passing that to Java. +# +# Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS, +# and GRADLE_OPTS) rely on word-splitting, this is performed explicitly; +# see the in-line comments for details. +# +# There are tweaks for specific operating systems such as AIX, CygWin, +# Darwin, MinGW, and NonStop. +# +# (3) This script is generated from the Groovy template +# https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt +# within the Gradle project. +# +# You can find Gradle at https://github.com/gradle/gradle/. +# +############################################################################## + +# Attempt to set APP_HOME + +# Resolve links: $0 may be a link +app_path=$0 + +# Need this for daisy-chained symlinks. +while + APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path + [ -h "$app_path" ] +do + ls=$( ls -ld "$app_path" ) + link=${ls#*' -> '} + case $link in #( + /*) app_path=$link ;; #( + *) app_path=$APP_HOME$link ;; + esac +done + +APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit + +APP_NAME="Gradle" +APP_BASE_NAME=${0##*/} + +# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' + +# Use the maximum available, or set MAX_FD != -1 to use that value. +MAX_FD=maximum + +warn () { + echo "$*" +} >&2 + +die () { + echo + echo "$*" + echo + exit 1 +} >&2 + +# OS specific support (must be 'true' or 'false'). +cygwin=false +msys=false +darwin=false +nonstop=false +case "$( uname )" in #( + CYGWIN* ) cygwin=true ;; #( + Darwin* ) darwin=true ;; #( + MSYS* | MINGW* ) msys=true ;; #( + NONSTOP* ) nonstop=true ;; +esac + +CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar + + +# Determine the Java command to use to start the JVM. +if [ -n "$JAVA_HOME" ] ; then + if [ -x "$JAVA_HOME/jre/sh/java" ] ; then + # IBM's JDK on AIX uses strange locations for the executables + JAVACMD=$JAVA_HOME/jre/sh/java + else + JAVACMD=$JAVA_HOME/bin/java + fi + if [ ! -x "$JAVACMD" ] ; then + die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." + fi +else + JAVACMD=java + which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." +fi + +# Increase the maximum file descriptors if we can. +if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then + case $MAX_FD in #( + max*) + MAX_FD=$( ulimit -H -n ) || + warn "Could not query maximum file descriptor limit" + esac + case $MAX_FD in #( + '' | soft) :;; #( + *) + ulimit -n "$MAX_FD" || + warn "Could not set maximum file descriptor limit to $MAX_FD" + esac +fi + +# Collect all arguments for the java command, stacking in reverse order: +# * args from the command line +# * the main class name +# * -classpath +# * -D...appname settings +# * --module-path (only if needed) +# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables. + +# For Cygwin or MSYS, switch paths to Windows format before running java +if "$cygwin" || "$msys" ; then + APP_HOME=$( cygpath --path --mixed "$APP_HOME" ) + CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" ) + + JAVACMD=$( cygpath --unix "$JAVACMD" ) + + # Now convert the arguments - kludge to limit ourselves to /bin/sh + for arg do + if + case $arg in #( + -*) false ;; # don't mess with options #( + /?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath + [ -e "$t" ] ;; #( + *) false ;; + esac + then + arg=$( cygpath --path --ignore --mixed "$arg" ) + fi + # Roll the args list around exactly as many times as the number of + # args, so each arg winds up back in the position where it started, but + # possibly modified. + # + # NB: a `for` loop captures its iteration list before it begins, so + # changing the positional parameters here affects neither the number of + # iterations, nor the values presented in `arg`. + shift # remove old arg + set -- "$@" "$arg" # push replacement arg + done +fi + +# Collect all arguments for the java command; +# * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of +# shell script including quotes and variable substitutions, so put them in +# double quotes to make sure that they get re-expanded; and +# * put everything else in single quotes, so that it's not re-expanded. + +set -- \ + "-Dorg.gradle.appname=$APP_BASE_NAME" \ + -classpath "$CLASSPATH" \ + org.gradle.wrapper.GradleWrapperMain \ + "$@" + +# Use "xargs" to parse quoted args. +# +# With -n1 it outputs one arg per line, with the quotes and backslashes removed. +# +# In Bash we could simply go: +# +# readarray ARGS < <( xargs -n1 <<<"$var" ) && +# set -- "${ARGS[@]}" "$@" +# +# but POSIX shell has neither arrays nor command substitution, so instead we +# post-process each arg (as a line of input to sed) to backslash-escape any +# character that might be a shell metacharacter, then use eval to reverse +# that process (while maintaining the separation between arguments), and wrap +# the whole thing up as a single "set" statement. +# +# This will of course break if any of these variables contains a newline or +# an unmatched quote. +# + +eval "set -- $( + printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" | + xargs -n1 | + sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' | + tr '\n' ' ' + )" '"$@"' + +exec "$JAVACMD" "$@" diff --git a/gradlew.bat b/gradlew.bat new file mode 100644 index 0000000..107acd3 --- /dev/null +++ b/gradlew.bat @@ -0,0 +1,89 @@ +@rem +@rem Copyright 2015 the original author or authors. +@rem +@rem Licensed under the Apache License, Version 2.0 (the "License"); +@rem you may not use this file except in compliance with the License. +@rem You may obtain a copy of the License at +@rem +@rem https://www.apache.org/licenses/LICENSE-2.0 +@rem +@rem Unless required by applicable law or agreed to in writing, software +@rem distributed under the License is distributed on an "AS IS" BASIS, +@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +@rem See the License for the specific language governing permissions and +@rem limitations under the License. +@rem + +@if "%DEBUG%" == "" @echo off +@rem ########################################################################## +@rem +@rem Gradle startup script for Windows +@rem +@rem ########################################################################## + +@rem Set local scope for the variables with windows NT shell +if "%OS%"=="Windows_NT" setlocal + +set DIRNAME=%~dp0 +if "%DIRNAME%" == "" set DIRNAME=. +set APP_BASE_NAME=%~n0 +set APP_HOME=%DIRNAME% + +@rem Resolve any "." and ".." in APP_HOME to make it shorter. +for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi + +@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m" + +@rem Find java.exe +if defined JAVA_HOME goto findJavaFromJavaHome + +set JAVA_EXE=java.exe +%JAVA_EXE% -version >NUL 2>&1 +if "%ERRORLEVEL%" == "0" goto execute + +echo. +echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. +echo. +echo Please set the JAVA_HOME variable in your environment to match the +echo location of your Java installation. + +goto fail + +:findJavaFromJavaHome +set JAVA_HOME=%JAVA_HOME:"=% +set JAVA_EXE=%JAVA_HOME%/bin/java.exe + +if exist "%JAVA_EXE%" goto execute + +echo. +echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% +echo. +echo Please set the JAVA_HOME variable in your environment to match the +echo location of your Java installation. + +goto fail + +:execute +@rem Setup the command line + +set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar + + +@rem Execute Gradle +"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %* + +:end +@rem End local scope for the variables with windows NT shell +if "%ERRORLEVEL%"=="0" goto mainEnd + +:fail +rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of +rem the _cmd.exe /c_ return code! +if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 +exit /b 1 + +:mainEnd +if "%OS%"=="Windows_NT" endlocal + +:omega diff --git a/settings.gradle b/settings.gradle new file mode 100644 index 0000000..fc747da --- /dev/null +++ b/settings.gradle @@ -0,0 +1,11 @@ +/* + * This file was generated by the Gradle 'init' task. + * + * The settings file is used to specify which projects to include in your build. + * + * Detailed information about configuring a multi-project build in Gradle can be found + * in the user manual at https://docs.gradle.org/7.3/userguide/multi_project_builds.html + */ + +rootProject.name = 'butler' +include('app')