Store hashed ips. Display unique ip count in catalog

internal/util/cooldowns.go

@@ -1,6 +1,8 @@
 package util
 
 import (
+	"crypto/sha256"
+	"encoding/hex"
 	"net"
 	"net/http"
 	"strings"
@@ -43,3 +45,8 @@ func GetIP(r *http.Request) string {
 	}
 	return ip
 }
+
+func HashIp(ip string) string {
+	checksum := sha256.Sum256([]byte(ip))
+	return hex.EncodeToString(checksum[:])
+}

internal/util/posts.go

@@ -12,6 +12,7 @@ import (
 	"strings"
 
 	"github.com/disintegration/imaging"
+	"github.com/dominicf2001/comfychan/internal/database"
 )
 
 // 10 MB memory limit
@@ -102,3 +103,11 @@ func SavePostFile(file *multipart.File, filename string) error {
 
 	return nil
 }
+
+func SumUniquePostIps(posts []database.Post) int {
+	uniqueIpHashes := map[string]bool{}
+	for _, post := range posts {
+		uniqueIpHashes[post.IpHash] = true
+	}
+	return len(uniqueIpHashes)
+}