implemented configuration from config.json file

.gitignore

@@ -0,0 +1 @@
+files

README.md

@@ -1,6 +1,16 @@
 # goImgCDN
 CDN for images, written in Go lang
 
+This is a server to post images and serve images.
+File type accepted:
+```
+- PNG
+- JPG
+- JPEG
+```
+All the files are converted to PNG, and resized to the configured sizes.
+
+## Use
 upload example (with curl):
 ```
 curl -F file=@./image1.png http://127.0.0.1:3050/image
@@ -10,3 +20,25 @@ to get image:
 ```
 http://127.0.0.1:3050/images/image1.png
 ```
+
+## Configuration
+Example configuration file (config.json):
+```
+{
+    "folder": "files",
+    "blockedIPs": [
+        "192.168.1.3",
+        "147.116.48.158"
+    ],
+    "allowedIPs": [
+        "127.0.0.1"
+    ],
+    "imgWidth": 200,
+    "imgHeigh": 0
+}
+```
+The "allowedIPs" are the IPs allowed to post images.
+
+"blockedIPs" are the IPs blocked from posting images.
+
+Also, all IPs not present in the "allowedIPs", will be blocked.

config.json

@@ -0,0 +1,12 @@
+{
+    "folder": "files",
+    "blockedIPs": [
+        "192.168.1.3",
+        "147.116.48.158"
+    ],
+    "allowedIPs": [
+        "127.0.0.1"
+    ],
+    "imgWidth": 200,
+    "imgHeigh": 0
+}

handlers.go

@@ -58,7 +58,7 @@ func NewImage(w http.ResponseWriter, r *http.Request) {
 	if err != nil {
 		fmt.Fprintln(w, "error al processar la imatge")
 	}
-	err = ioutil.WriteFile(fileName, data, 0777)
+	err = ioutil.WriteFile(config.Folder+"/"+fileName, data, 0777)
 	if err != nil {
 		fmt.Println(err)
 	}

imageOperations.go

@@ -59,6 +59,6 @@ func imageToPNG(img image.Image) ([]byte, error) {
 }
 
 func Resize(img image.Image) image.Image {
-	r := resize.Resize(160, 0, img, resize.Lanczos3)
+	r := resize.Resize(uint(config.ImgWidth), uint(config.ImgHeigh), img, resize.Lanczos3)
 	return r
 }

ipFilter.go

@@ -10,10 +10,17 @@ import (
 func ipFilter(r *http.Request) error {
 	var err error
 	fmt.Println(r.RemoteAddr)
-	ip := strings.Split(r.RemoteAddr, ":")[0]
-	if ip != "127.0.0.1" {
+	reqIP := strings.Split(r.RemoteAddr, ":")[0]
+	for _, ip := range config.BlockedIPs {
+		if reqIP == ip {
 			err = errors.New("ip not allowed to post images")
 		}
+	}
 
+	for _, ip := range config.AllowedIPs {
+		if reqIP != ip {
+			err = errors.New("ip not allowed to post images")
+		}
+	}
 	return err
 }

main.go

@@ -1,11 +1,14 @@
 package main
 
 import (
+	"fmt"
 	"log"
 	"net/http"
 )
 
 func main() {
+	readConfig("config.json")
+	fmt.Println(config)
 
 	router := NewRouter()
 

readConfig.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+)
+
+type Config struct {
+	Folder     string   `json:"foldIPs`
+	BlockedIPs []string `json:"blockedIPs"`
+	AllowedIPs []string `json:"allowedIPs"`
+	ImgWidth   int      `json:"imgWidth"`
+	ImgHeigh   int      `json:"imgHeigh"`
+}
+
+var config Config
+
+func readConfig(path string) {
+	file, err := ioutil.ReadFile(path)
+	if err != nil {
+		fmt.Println("error: ", err)
+	}
+	content := string(file)
+	json.Unmarshal([]byte(content), &config)
+}