initial commit

.gitignore

@@ -19,3 +19,6 @@
 
 # Go workspace file
 go.work
+
+# Ignore dotenv files
+.env*

README.md

@@ -0,0 +1,22 @@
+# Echo
+
+Janus allows you to setup a simple file server for local testing.
+
+### Requirements
+
+- Go (any recent version should work, native to Go 1.21)
+
+## Usage
+
+1. Clone the project
+2. Create a `.env` file
+
+- Add `SERVER_PORT={PORT}`
+- Add `BASE_PATH={PATH}`
+
+3. Run the program with `go run .`
+
+## Notes
+
+Echo is intended for localhost testing ONLY and designed as a convenient alternative to spinning up a nginx webserver for serving files quickly.
+Do not use in a production environment, as no security features are implemented.

go.mod

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+module notashelf.dev/echo
+
+go 1.21.4
+
+require github.com/joho/godotenv v1.5.1

go.sum

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+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=

main.go

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+package main
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strconv"
+
+	"github.com/joho/godotenv"
+)
+
+func main() {
+	err := godotenv.Load()
+	if err != nil {
+		fmt.Println("Error loading .env file")
+	}
+
+	serverPort := os.Getenv("SERVER_PORT")
+	if serverPort == "" {
+		serverPort = "8080"
+	}
+
+	basePath := os.Getenv("BASE_PATH")
+	if basePath == "" {
+		basePath = "."
+	}
+
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		if regexp.MustCompile(`\.\.\/?`).MatchString(r.URL.Path) {
+			http.Error(w, "Forbidden", http.StatusForbidden)
+			return
+		}
+
+		filePath := filepath.Join(basePath, r.URL.Path)
+		http.ServeFile(w, r, filePath)
+	})
+
+	port, _ := strconv.Atoi(serverPort)
+	fmt.Printf("Echo started with base path %s on port %d\n", basePath, port)
+	http.ListenAndServe(":"+serverPort, nil)
+}