front: finish docx & back: init

backend/api/main.go

@@ -0,0 +1,15 @@
+package api
+
+import (
+	"net/http"
+
+	"github.com/fumiama/paper-manager/backend/utils"
+)
+
+// Handler serves all backend /api call
+func Handler(w http.ResponseWriter, r *http.Request) {
+	if !utils.IsMethod("GET", w, r) {
+		return
+	}
+	http.Error(w, "404 Not Found", http.StatusNotFound)
+}

backend/file/provider.go

@@ -0,0 +1,26 @@
+package file
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/fumiama/paper-manager/backend/global"
+	"github.com/fumiama/paper-manager/backend/utils"
+	"github.com/sirupsen/logrus"
+)
+
+// Handler serves contents in global.FileFolder
+func Handler(w http.ResponseWriter, r *http.Request) {
+	if !utils.IsMethod("GET", w, r) {
+		return
+	}
+	i := strings.LastIndex(r.URL.Path, "/")
+	fn := r.URL.Path[i+1:]
+	if fn == "" {
+		http.Error(w, "400 Bad Request: empty path", http.StatusBadRequest)
+		return
+	}
+	name := global.FileFolder + fn
+	logrus.Infoln("[file.Handler]\t serve", name)
+	http.ServeFile(w, r, name)
+}

backend/global/base.go

@@ -0,0 +1,36 @@
+package global
+
+import (
+	"os"
+	"runtime"
+
+	"github.com/sirupsen/logrus"
+)
+
+const (
+	// DataFolder stores all backend data in
+	DataFolder = "./data/"
+	// FileFolder stores all blob files
+	FileFolder = DataFolder + "file/"
+)
+
+func init() {
+	initdir(DataFolder)
+	initdir(FileFolder)
+}
+
+func initdir(folder string) {
+	err := os.MkdirAll(folder, 0755)
+	if err != nil {
+		logrus.Errorln("[os.MkdirAll]\t", err)
+		os.Exit(line())
+	}
+}
+
+func line() int {
+	_, _, fileLine, ok := runtime.Caller(2)
+	if ok {
+		return fileLine
+	}
+	return -1
+}

backend/utils/method.go

@@ -0,0 +1,27 @@
+package utils
+
+import (
+	"net/http"
+
+	"github.com/sirupsen/logrus"
+)
+
+// IP gets ip from r.Header's X-FORWARDED-FOR or r.RemoteAddr
+func IP(r *http.Request) string {
+	forwarded := r.Header.Get("X-FORWARDED-FOR")
+	if forwarded != "" {
+		return forwarded
+	}
+	return r.RemoteAddr
+}
+
+// IsMethod check if the method meets the requirement
+// and response 405 Method Not Allowed if not matched
+func IsMethod(m string, w http.ResponseWriter, r *http.Request) bool {
+	logrus.Infoln("[utils.IsMethod]\t accept", IP(r), r.Method, r.URL)
+	if r.Method != m {
+		http.Error(w, "405 Method Not Allowed", http.StatusMethodNotAllowed)
+		return false
+	}
+	return true
+}