113 lines
2.0 KiB
Go
113 lines
2.0 KiB
Go
package middleware
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import (
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"net/http"
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"os"
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"strings"
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"github.com/gin-gonic/gin"
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"github.com/golang-jwt/jwt/v4"
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)
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var jwtSecret = []byte(os.Getenv("JWT_SECRET"))
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type Claims struct {
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UserID string `json:"user_id"`
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Role string `json:"role"`
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jwt.RegisteredClaims
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}
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func AuthMiddleware() gin.HandlerFunc {
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return func(c *gin.Context) {
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var tokenString string
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cookie, err := c.Cookie("auth_token")
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if err == nil && cookie != "" {
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tokenString = cookie
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}
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if tokenString == "" {
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authHeader := c.GetHeader("Authorization")
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if authHeader != "" {
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parts := strings.Split(authHeader, " ")
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if len(parts) == 2 && parts[0] == "Bearer" {
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tokenString = parts[1]
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}
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}
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}
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if tokenString == "" {
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abortUnauthorized(c)
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return
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}
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claims := &Claims{}
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token, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
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if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, jwt.ErrTokenSignatureInvalid
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}
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return jwtSecret, nil
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})
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if err != nil || !token.Valid {
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abortUnauthorized(c)
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return
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}
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c.Set("user_id", claims.UserID)
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c.Set("role", claims.Role)
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c.Next()
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}
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}
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func abortUnauthorized(c *gin.Context) {
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if strings.Contains(c.GetHeader("Accept"), "text/html") {
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c.Redirect(http.StatusFound, "/login")
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} else {
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c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{
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"error": "unauthorized",
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})
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}
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c.Abort()
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}
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func RequireRole(roles ...string) gin.HandlerFunc {
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return func(c *gin.Context) {
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roleValue, exists := c.Get("role")
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if !exists {
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abortForbidden(c)
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return
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}
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userRole, ok := roleValue.(string)
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if !ok {
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abortForbidden(c)
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return
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}
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for _, allowed := range roles {
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if userRole == allowed {
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c.Next()
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return
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}
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}
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abortForbidden(c)
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}
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}
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func abortForbidden(c *gin.Context) {
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if strings.Contains(c.GetHeader("Accept"), "text/html") {
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c.Redirect(http.StatusFound, "/")
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} else {
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c.AbortWithStatusJSON(http.StatusForbidden, gin.H{
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"error": "forbidden",
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})
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}
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c.Abort()
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}
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