Add: endpoint files

+package endpoints
+
+import (
+	"classroom/functions"
+	"classroom/models"
+	"database/sql"
+	"net/http"
+
+	"github.com/julienschmidt/httprouter"
+)
+
+// GET /files
+func (e *Endpoints) FilesGet(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
+	// Get user email
+	var email string
+	if _email, ok := r.Header["X-User-Email"]; ok {
+		email = _email[0]
+	} else {
+		functions.ResponseError(w, 401, "X-User-Email 헤더를 보내세요.")
+		return
+	}
+
+	// Permission Check
+	var isSuper int
+	row := e.DB.QueryRow(`
+		SELECT is_super FROM users WHERE email=?;
+	`, email)
+	if err := row.Scan(&isSuper); err != nil {
+		if err == sql.ErrNoRows {
+			functions.ResponseError(w, 401, "해당 유저가 존재하지 않습니다.")
+			return
+		}
+		functions.ResponseError(w, 500, "예기치 못한 에러 : "+err.Error())
+		return
+	}
+	if isSuper == 0 {
+		functions.ResponseError(w, 403, "접근 권한 부족. 관리자만 허용된 기능입니다.")
+		return
+	}
+
+	// Result Resp
+	resp := models.FilesGetResponse{}
+	resp.Files = []models.FilesGetItem{}
+
+	// Querying
+	rows, err := e.DB.Query(`
+		SELECT id, name, created_at FROM files ORDER BY created_at DESC;`)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			resp.FilesCount = 0
+			functions.ResponseOK(w, "success", resp)
+			return
+		}
+		functions.ResponseError(w, 500, "예기치 못한 에러 : "+err.Error())
+		return
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var fileID, fileName, createdAtStr string
+		err := rows.Scan(&fileID, &fileName, &createdAtStr)
+		if err != nil {
+			continue
+		}
+
+		temp := models.FilesGetItem{
+			FileID:    fileID,
+			FileName:  fileName,
+			CreatedAt: functions.ToKST(createdAtStr),
+		}
+		resp.Files = append(resp.Files, temp)
+	}
+
+	// Struct for response
+	resp.FilesCount = len(resp.Files)
+
+	functions.ResponseOK(w, "success", resp)
+}

@@ -74,6 +74,7 @@ func main() {
 	router.GET("/api", ep.IndexGet)
 	router.GET("/api/users", ep.UsersGet)
 	router.POST("/api/users", ep.UsersPost)
+	router.GET("/api/files", ep.FilesGet)
 	router.GET("/api/files/:file_id/:sheet_id/cell", ep.CellGet)
 	router.POST("/api/files/:file_id/:sheet_id/reservation", ep.ReservationPost)
 	router.DELETE("/api/files/:file_id/:sheet_id/reservation/:reservation_id", ep.ReservationDelete)

+package models
+
+type FilesGetResponse struct {
+	FilesCount int            `json:"files_count"`
+	Files      []FilesGetItem `json:"files"`
+}
+
+type FilesGetItem struct {
+	FileID    string `json:"file_id"`
+	FileName  string `json:"file_name"`
+	CreatedAt string `json:"created_at"`
+}