From cf9fe092d6e282bc32b135c3ad86fafcf3f8e6c0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=AB=8F=E8=A8=AA=E5=AD=90?= <suwako@076.moe>
Date: Wed, 17 May 2023 09:50:17 +0900
Subject: [PATCH] =?UTF-8?q?=E6=9C=80=E5=88=9D=E3=82=B3=E3=83=9F=E3=83=83?=
 =?UTF-8?q?=E3=83=88?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .gitignore |  1 +
 go.mod     |  3 +++
 main.go    | 42 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 46 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 go.mod
 create mode 100644 main.go

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..aa871a5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+imgproxy
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..e5de6c3
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module imgproxy
+
+go 1.20
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..82ebcde
--- /dev/null
+++ b/main.go
@@ -0,0 +1,42 @@
+package main
+
+import (
+  "fmt"
+  "net/http"
+  "io"
+  "log"
+)
+
+var client = http.Client{}
+
+func imgproxy (w http.ResponseWriter, r *http.Request) {
+  // r.URL.Pathは「/」で始まるから、「https://」じゃなくて、「https:/」となります。
+  img, err := client.Get("https:/" + r.URL.Path)
+  if err != nil {
+    fmt.Fprintf(w, "Error %d", err)
+    return
+  }
+
+  // 画像だけをプロクシーする様に
+  ctype := img.Header.Get("Content-Type")
+  if ctype != "image/jpeg" && ctype != "image/png" && ctype != "image/gif" && ctype != "image/tga" && ctype != "image/targa" && ctype != "image/webp" {
+    return
+  }
+
+  // ヘッダー
+  w.Header().Set("Content-Length", fmt.Sprint(img.ContentLength))
+  w.Header().Set("Content-Type", img.Header.Get("Content-Type"))
+
+  // 表示
+  if _, err = io.Copy(w, img.Body); err != nil {
+    log.Fatalf("ioエラー：%v", err)
+  }
+
+  // もう要らない
+  img.Body.Close()
+}
+
+func main () {
+  http.HandleFunc("/", imgproxy)
+  http.ListenAndServe(":9810", nil)
+}