Extend configuration

Resources/example_config.json

@@ -1,4 +1,6 @@
 {
+    "port" : 6001,
+    "maxBodySize" : "2mb",
     "logPath": "\/var\/log\/caps.log",
     "serveFiles": true,
     "writers" : [

Sources/App/Config.swift

@@ -2,6 +2,12 @@ import Foundation
 
 struct Config: Codable {
 
+    /// The port where the server runs
+    let port: Int
+
+    /// The maximum size of the request body
+    let maxBodySize: String
+
     /// The path to the log file
     let logPath: String
 
@@ -14,8 +20,47 @@ struct Config: Codable {
     var logURL: URL {
         .init(fileURLWithPath: logPath)
     }
+}
 
-    static var `default`: Config {
+extension Config {
-        .init(logPath: "/var/log/caps.log", serveFiles: true, writers: [])
+
+    private static func file(in directory: URL) -> URL {
+        directory.appendingPathComponent("config.json")
+    }
+
+    init(loadFrom directory: URL) {
+        let configFileUrl = Config.file(in: directory)
+
+        if FileManager.default.fileExists(atPath: configFileUrl.path) {
+            self.init(loadAt: configFileUrl)
+        } else {
+            self.init(standardIn: directory)
+
+        }
+    }
+
+    private init(loadAt url: URL) {
+        do {
+            let configData = try Data(contentsOf: url)
+            self = try JSONDecoder().decode(Config.self, from: configData)
+        } catch {
+            print("Failed to load configuration from \(url.path): \(error)")
+            print("Using default configuration")
+            self.init(standardIn: url.deletingLastPathComponent())
+        }
+    }
+
+    private init(standardIn directory: URL) {
+        let defaultLogPath = directory.appendingPathComponent("logs").path
+        self.init(port: 8000, maxBodySize: "2mb", logPath: defaultLogPath, serveFiles: true, writers: [])
+        
+        let configFileUrl = Config.file(in: directory)
+        do {
+            let configData = try JSONEncoder().encode(self)
+            try configData.write(to: configFileUrl)
+            print("Default configuration written at \(configFileUrl.path)")
+        } catch {
+            print("Failed to write default configuration to \(configFileUrl.path)")
+        }
     }
 }

Sources/App/configure.swift

@@ -6,21 +6,11 @@ private(set) var server: CapServer!
 
 public func configure(_ app: Application) throws {
 
-    app.http.server.configuration.port = 6001
-    app.routes.defaultMaxBodySize = "2mb"
-
-    let configFile = URL(fileURLWithPath: app.directory.resourcesDirectory)
-        .appendingPathComponent("config.json")
-    let config: Config
-    if !FileManager.default.fileExists(atPath: configFile.path) {
-        config = try writeDefaultCofig(to: configFile)
-    } else {
-        config = try loadConfig(at: configFile)
-    }
-
     try Log.set(logFile: config.logPath)
 
+    let resourceDirectory = URL(fileURLWithPath: app.directory.resourcesDirectory)
     let publicDirectory = app.directory.publicDirectory
+    let config = Config(loadFrom: resourceDirectory)
     if config.serveFiles {
         let middleware = FileMiddleware(publicDirectory: publicDirectory)
         app.middleware.use(middleware)