115 lines
3.6 KiB
Go
115 lines
3.6 KiB
Go
// Copyright (c) 2025 Probo Inc <hello@getprobo.com>.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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package mcp_v1
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import (
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"net/http"
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"strings"
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"go.gearno.de/kit/log"
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"go.probo.inc/probo/pkg/auth"
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"go.probo.inc/probo/pkg/authz"
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"go.probo.inc/probo/pkg/gid"
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)
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// WithMCPAuth wraps an HTTP handler with MCP authentication middleware
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// It authenticates using API keys from the Authorization header
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func WithMCPAuth(
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logger *log.Logger,
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authSvc *auth.Service,
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authzSvc *authz.Service,
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next http.Handler,
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) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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correlationID := r.Header.Get("X-Request-ID")
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if correlationID == "" {
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correlationID = r.Header.Get("X-Correlation-ID")
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}
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logger.InfoCtx(ctx, "MCP authentication attempt",
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log.String("correlation_id", correlationID),
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log.String("path", r.URL.Path),
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)
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// Extract API key from Authorization header
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authHeader := r.Header.Get("Authorization")
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if authHeader == "" {
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logger.WarnCtx(ctx, "MCP auth: missing Authorization header",
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log.String("correlation_id", correlationID),
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)
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http.Error(w, "authentication required", http.StatusUnauthorized)
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return
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}
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// Expect "Bearer <token>" format
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parts := strings.SplitN(authHeader, " ", 2)
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if len(parts) != 2 || strings.ToLower(parts[0]) != "bearer" {
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logger.WarnCtx(ctx, "MCP auth: invalid Authorization header format",
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log.String("correlation_id", correlationID),
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)
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http.Error(w, "invalid authorization header", http.StatusUnauthorized)
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return
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}
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apiKeyToken := parts[1]
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// Validate the API key
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user, userAPIKey, err := authSvc.ValidateUserAPIKey(ctx, apiKeyToken)
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if err != nil {
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logger.WarnCtx(ctx, "MCP auth: invalid API key",
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log.Error(err),
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log.String("correlation_id", correlationID),
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)
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http.Error(w, "invalid api key", http.StatusUnauthorized)
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return
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}
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// Get organizations for this API key through the service layer
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organizations, err := authzSvc.GetAllOrganizationsForUserAPIKeyId(ctx, userAPIKey.ID)
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if err != nil {
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logger.ErrorCtx(ctx, "MCP auth: failed to load API key organizations",
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log.Error(err),
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log.String("correlation_id", correlationID),
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)
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http.Error(w, "internal server error", http.StatusInternalServerError)
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return
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}
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// Extract tenant IDs from organizations
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tenantIDs := make([]gid.TenantID, 0, len(organizations))
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for _, org := range organizations {
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tenantIDs = append(tenantIDs, org.ID.TenantID())
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}
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// Create MCP context with user and accessible tenants
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mcpCtx := &MCPContext{
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UserID: user.ID,
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TenantIDs: tenantIDs,
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}
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ctx = ContextWithMCPContext(ctx, mcpCtx)
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logger.InfoCtx(ctx, "MCP authentication successful",
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log.String("correlation_id", correlationID),
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log.String("user_id", user.ID.String()),
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log.String("api_key_id", userAPIKey.ID.String()),
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log.Int("accessible_tenants", len(tenantIDs)),
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)
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next.ServeHTTP(w, r.WithContext(ctx))
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})
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}
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