feat: add desktop bug report collection

server/internal/shared/middleware/rate_limit.go

@@ -0,0 +1,69 @@
+package middleware
+
+import (
+	"sync"
+	"time"
+
+	"github.com/gin-gonic/gin"
+
+	"github.com/geo-platform/tenant-api/internal/shared/response"
+)
+
+type rateLimitEntry struct {
+	windowStart time.Time
+	count       int
+}
+
+type inMemoryRateLimiter struct {
+	mu        sync.Mutex
+	entries   map[string]rateLimitEntry
+	max       int
+	window    time.Duration
+	lastSweep time.Time
+}
+
+func RateLimitByClientIP(max int, window time.Duration, code int, message, detail string) gin.HandlerFunc {
+	limiter := &inMemoryRateLimiter{
+		entries: make(map[string]rateLimitEntry),
+		max:     max,
+		window:  window,
+	}
+	return func(c *gin.Context) {
+		if !limiter.allow(c.ClientIP(), time.Now()) {
+			response.Error(c, response.ErrTooManyRequests(code, message, detail))
+			c.Abort()
+			return
+		}
+		c.Next()
+	}
+}
+
+func (l *inMemoryRateLimiter) allow(key string, now time.Time) bool {
+	if l == nil || l.max <= 0 || l.window <= 0 || key == "" {
+		return true
+	}
+
+	l.mu.Lock()
+	defer l.mu.Unlock()
+
+	if l.lastSweep.IsZero() || now.Sub(l.lastSweep) >= l.window {
+		l.lastSweep = now
+		for entryKey, entry := range l.entries {
+			if now.Sub(entry.windowStart) >= l.window {
+				delete(l.entries, entryKey)
+			}
+		}
+	}
+
+	entry, ok := l.entries[key]
+	if !ok || now.Sub(entry.windowStart) >= l.window {
+		l.entries[key] = rateLimitEntry{windowStart: now, count: 1}
+		return true
+	}
+	if entry.count >= l.max {
+		return false
+	}
+	entry.count++
+	l.entries[key] = entry
+	return true
+}