feat: Add jwt token pkg

internal/pkg/middleware/authn.go

@@ -0,0 +1,56 @@
+// MIT License
+//
+// Copyright (c) 2024 vinchent <vinchent@vinchent.xyz>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package middleware
+
+import (
+	"net/http"
+
+	"git.vinchent.xyz/vinchent/howmuch/internal/pkg/core"
+	"git.vinchent.xyz/vinchent/howmuch/internal/pkg/errno"
+	"git.vinchent.xyz/vinchent/howmuch/internal/pkg/token"
+	"github.com/gin-gonic/gin"
+)
+
+var ErrTokenInvalid = &errno.Errno{
+	HTTP:    http.StatusUnauthorized,
+	Code:    errno.ErrorCode(errno.AuthFailureCode, "TokenInvalid"),
+	Message: "invalid token",
+}
+
+const XUserName = "X-Username"
+
+// Authn authenticates a user's access by validating their token.
+func Authn() gin.HandlerFunc {
+	return func(ctx *gin.Context) {
+		tk, err := token.ParseRequest(ctx)
+		if err != nil || tk == nil {
+			core.WriteResponse(ctx, ErrTokenInvalid, nil)
+			ctx.Abort()
+		}
+
+		// TODO: check if the key is on logout blacklist.
+
+		ctx.Header(XUserName, tk.Identity)
+		ctx.Next()
+	}
+}