add two middlewares - Authenticate and GinContextToContext

internal/gin/middleware/authenticate.go

@@ -0,0 +1,48 @@
+package middleware
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/gin-gonic/gin"
+	"github.com/zdam-egzamin-zawodowy/backend/internal/auth"
+	"github.com/zdam-egzamin-zawodowy/backend/internal/models"
+)
+
+const (
+	authorizationHeader = "Authorization"
+)
+
+var (
+	authenticateKey contextKey = "current_user"
+)
+
+func Authenticate(ucase auth.Usecase) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		token := extractToken(c.GetHeader(authorizationHeader))
+		if token != "" {
+			ctx := c.Request.Context()
+			user, err := ucase.ExtractAccessTokenMetadata(ctx, token)
+			if err == nil && user != nil {
+				ctx = context.WithValue(ctx, authenticateKey, user)
+				c.Request = c.Request.WithContext(ctx)
+			}
+		}
+		c.Next()
+	}
+}
+
+func UserFromContext(ctx context.Context) (*models.User, error) {
+	user := ctx.Value(authenticateKey)
+	if user == nil {
+		err := fmt.Errorf("Could not retrieve *models.User")
+		return nil, err
+	}
+
+	gc, ok := user.(*models.User)
+	if !ok {
+		err := fmt.Errorf("*models.User has wrong type")
+		return nil, err
+	}
+	return gc, nil
+}

internal/gin/middleware/context_key.go

@@ -0,0 +1,3 @@
+package middleware
+
+type contextKey string

internal/gin/middleware/gin_context_to_context.go

@@ -0,0 +1,35 @@
+package middleware
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/gin-gonic/gin"
+)
+
+var (
+	ginContextToContextKey contextKey = "gin_context"
+)
+
+func GinContextToContext() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		ctx := context.WithValue(c.Request.Context(), ginContextToContextKey, c)
+		c.Request = c.Request.WithContext(ctx)
+		c.Next()
+	}
+}
+
+func GinContextFromContext(ctx context.Context) (*gin.Context, error) {
+	ginContext := ctx.Value(ginContextToContextKey)
+	if ginContext == nil {
+		err := fmt.Errorf("could not retrieve gin.Context")
+		return nil, err
+	}
+
+	gc, ok := ginContext.(*gin.Context)
+	if !ok {
+		err := fmt.Errorf("gin.Context has wrong type")
+		return nil, err
+	}
+	return gc, nil
+}

internal/gin/middleware/helpers.go

@@ -0,0 +1,13 @@
+package middleware
+
+import (
+	"strings"
+)
+
+func extractToken(bearToken string) string {
+	strArr := strings.Split(bearToken, " ")
+	if len(strArr) == 2 {
+		return strArr[1]
+	}
+	return ""
+}