Merge pull request #7 from JustKato/rate-limiting

Working on the API Rate limiting

go.mod

@@ -6,4 +6,5 @@ require (
 	github.com/gin-gonic/gin v1.7.7
 	github.com/joho/godotenv v1.4.0
 	github.com/mrz1836/go-sanitize v1.1.5
+	github.com/ulule/limiter/v3 v3.10.0
 )

go.sum

@@ -1,6 +1,11 @@
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@@ -13,13 +18,32 @@ github.com/go-playground/universal-translator v0.17.0 h1:icxd5fm+REJzpZx7ZfpaD87
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@@ -30,32 +54,100 @@ github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742 h1:Esafd1046DLD
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lib/controllers/controllers_ratelimiter.go

@@ -0,0 +1,34 @@
+package controllers
+
+import (
+	"time"
+
+	"github.com/JustKato/FreePad/lib/helper"
+	"github.com/gin-gonic/gin"
+	"github.com/ulule/limiter/v3"
+	"github.com/ulule/limiter/v3/drivers/store/memory"
+
+	mgin "github.com/ulule/limiter/v3/drivers/middleware/gin"
+)
+
+// Apply the rate limiter to the gin Engine
+func DoRateLimit(router *gin.Engine) {
+
+	// Initialize the rate limiter
+	rate := limiter.Rate{
+		Period: 5 * time.Minute,
+		Limit:  int64(helper.GetApiBanLimit()),
+	}
+
+	// Initialize the memory storage
+	store := memory.NewStore()
+
+	// Initialize the limiter instance
+	instance := limiter.New(store, rate)
+
+	// Create the gin middleware
+	middleWare := mgin.NewMiddleware(instance)
+
+	// use the middleware in gin
+	router.Use(middleWare)
+}

lib/helper/helper_main.go

@@ -16,6 +16,25 @@ func GetDomainBase() string {
 	return domainBase
 }
 
+func GetApiBanLimit() int {
+	banLimit, exists := os.LookupEnv("API_BAN_LIMIT")
+
+	if !exists {
+		os.Setenv("API_BAN_LIMIT", "300")
+		banLimit = "300"
+	}
+
+	// Try and convert the string into an integer
+	rez, err := strconv.Atoi(banLimit)
+	// Check if the conversion has failed
+	if err != nil {
+		// Simply return the default
+		return 300
+	}
+
+	return rez
+}
+
 func GetMaximumPadSize() int {
 	// Lookup if the maximum pad size variable exists.
 	maxPadSize, exists := os.LookupEnv("MAXIMUM_PAD_SIZE")

main.go

@@ -31,6 +31,9 @@ func main() {
 	// Load in static path
 	router.Static("/static", "static/")
 
+	// Implement the rate limiter
+	controllers.DoRateLimit(router)
+
 	// Add Routes
 	routes.HomeRoutes(router)