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/
apikey.go
95 lines (79 loc) · 3.09 KB
/
apikey.go
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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package middleware contains application specific gin middleware functions.
package middleware
import (
"context"
"fmt"
"net/http"
"time"
"github.com/google/exposure-notifications-verification-server/pkg/cache"
"github.com/google/exposure-notifications-verification-server/pkg/controller"
"github.com/google/exposure-notifications-verification-server/pkg/database"
"github.com/google/exposure-notifications-verification-server/pkg/render"
"github.com/google/exposure-notifications-server/pkg/logging"
"github.com/gorilla/mux"
)
const (
// APIKeyHeader is the authorization header required for APIKey protected requests.
APIKeyHeader = "X-API-Key"
)
// RequireAPIKey reads the X-API-Key header and validates it is a real
// authorized app. It also ensures currentAuthorizedApp is set in the template
// map.
func RequireAPIKey(ctx context.Context, cacher cache.Cacher, db *database.Database, h *render.Renderer, allowedTypes []database.APIUserType) mux.MiddlewareFunc {
logger := logging.FromContext(ctx).Named("middleware.RequireAPIKey")
allowedTypesMap := make(map[database.APIUserType]struct{}, len(allowedTypes))
for _, t := range allowedTypes {
allowedTypesMap[t] = struct{}{}
}
cacheTTL := 5 * time.Minute
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
apiKey := r.Header.Get(APIKeyHeader)
if apiKey == "" {
logger.Debugw("missing API key in request")
controller.Unauthorized(w, r, h)
return
}
// Load the authorized app by using the cache to alleviate pressure on the
// database layer.
var authApp database.AuthorizedApp
cacheKey := fmt.Sprintf("authorized_apps:by_api_key:%s", apiKey)
if err := cacher.Fetch(ctx, cacheKey, &authApp, cacheTTL, func() (interface{}, error) {
return db.FindAuthorizedAppByAPIKey(apiKey)
}); err != nil {
if database.IsNotFound(err) {
logger.Debugw("invalid api key")
controller.Unauthorized(w, r, h)
return
}
logger.Errorw("failed to lookup authorized app", "error", err)
controller.InternalError(w, r, h, err)
return
}
// Verify this is an allowed type.
if _, ok := allowedTypesMap[authApp.APIKeyType]; !ok {
logger.Debugw("wrong request type", "got", authApp.APIKeyType, "allowed", allowedTypes)
controller.Unauthorized(w, r, h)
return
}
// Save the authorized app on the context.
ctx = controller.WithAuthorizedApp(ctx, &authApp)
*r = *r.WithContext(ctx)
next.ServeHTTP(w, r)
})
}
}