Add identity gateway scaffold

identity-gateway/go.mod

@@ -0,0 +1,8 @@
+module identity-gateway
+
+go 1.22
+
+require (
+    github.com/appwrite/sdk-for-go v1.0.4
+    github.com/gin-gonic/gin v1.10.0
+)

identity-gateway/internal/auth/provider.go

@@ -0,0 +1,64 @@
+package auth
+
+import (
+    "database/sql"
+    "net/http"
+    "strings"
+
+    "github.com/appwrite/sdk-for-go/client"
+    "github.com/appwrite/sdk-for-go/users"
+    "github.com/gin-gonic/gin"
+)
+
+type MyUser struct {
+    ID   string
+    Role string
+}
+
+type AuthProvider struct {
+    AppwriteClient client.Client
+    DB             *sql.DB
+}
+
+func (p *AuthProvider) ValidateSession() gin.HandlerFunc {
+    return func(c *gin.Context) {
+        tokenHeader := c.GetHeader("Authorization")
+        token := strings.TrimSpace(strings.TrimPrefix(tokenHeader, "Bearer"))
+        if token == "" {
+            c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Token ausente"})
+            return
+        }
+
+        p.AppwriteClient.SetJWT(token)
+        appwriteUsers := users.New(p.AppwriteClient)
+        remoteUser, err := appwriteUsers.Get()
+        if err != nil {
+            c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Sessão inválida no IDP"})
+            return
+        }
+
+        var userLocal MyUser
+        err = p.DB.QueryRow(
+            "SELECT id, role FROM users WHERE appwrite_id = $1",
+            remoteUser.Id,
+        ).Scan(&userLocal.ID, &userLocal.Role)
+
+        if err == sql.ErrNoRows {
+            err = p.DB.QueryRow(
+                "INSERT INTO users (appwrite_id, email, full_name) VALUES ($1, $2, $3) RETURNING id, role",
+                remoteUser.Id,
+                remoteUser.Email,
+                remoteUser.Name,
+            ).Scan(&userLocal.ID, &userLocal.Role)
+        }
+
+        if err != nil {
+            c.AbortWithStatusJSON(http.StatusInternalServerError, gin.H{"error": "Erro ao sincronizar usuário"})
+            return
+        }
+
+        c.Set("user_id", userLocal.ID)
+        c.Set("user_role", userLocal.Role)
+        c.Next()
+    }
+}

identity-gateway/migrations/migration.sql

@@ -0,0 +1,17 @@
+CREATE TABLE users (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    appwrite_id VARCHAR(255) UNIQUE NOT NULL,
+    email VARCHAR(255) UNIQUE NOT NULL,
+    full_name VARCHAR(255),
+    role VARCHAR(20) DEFAULT 'user' CHECK (role IN ('admin', 'manager', 'user')),
+    is_active BOOLEAN DEFAULT true,
+    last_login TIMESTAMP WITH TIME ZONE,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE user_security_configs (
+    user_id UUID REFERENCES users(id) ON DELETE CASCADE,
+    master_key_hint VARCHAR(100),
+    encryption_version INT DEFAULT 1,
+    PRIMARY KEY (user_id)
+);