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feat: cors support for gcp and for custom middleware
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| // Copyright 2021 Nitric Technologies Pty Ltd. | ||
| // | ||
| // 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 cors | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "os" | ||
| "strconv" | ||
| "strings" | ||
|
|
||
| "github.com/imdario/mergo" | ||
| "github.com/valyala/fasthttp" | ||
|
|
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| base_http "github.com/nitrictech/nitric/cloud/common/runtime/gateway" | ||
| v1 "github.com/nitrictech/nitric/core/pkg/api/nitric/v1" | ||
| "github.com/nitrictech/nitric/core/pkg/worker/pool" | ||
| ) | ||
|
|
||
| func GetCorsConfig(vals *v1.ApiCorsDefinition) (*v1.ApiCorsDefinition, error) { | ||
| defaultVal := &v1.ApiCorsDefinition{ | ||
| AllowCredentials: false, | ||
| AllowOrigins: []string{"*"}, | ||
| AllowHeaders: []string{"Content-Type", "Authorization"}, | ||
| AllowMethods: []string{"GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS"}, | ||
| ExposeHeaders: []string{}, | ||
| MaxAge: 300, | ||
| } | ||
|
|
||
| if err := mergo.Merge(defaultVal, vals, mergo.WithOverride); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| return defaultVal, nil | ||
| } | ||
|
|
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| // Used for GCP and Local CORs with fasthttp headers | ||
| func GetCorsHeaders(config *v1.ApiCorsDefinition) (*map[string]string, error) { | ||
| corsHeaders := map[string]string{} | ||
|
|
||
| corsConfig, err := GetCorsConfig(config) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| corsHeaders["Access-Control-Allow-Credentials"] = strconv.FormatBool(corsConfig.GetAllowCredentials()) | ||
|
|
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| if len(corsConfig.GetAllowOrigins()) > 0 { | ||
| corsHeaders["Access-Control-Allow-Origin"] = strings.Join(corsConfig.GetAllowOrigins(), ",") | ||
| } | ||
|
|
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| if len(corsConfig.GetAllowMethods()) > 0 { | ||
| corsHeaders["Access-Control-Allow-Methods"] = strings.Join(corsConfig.GetAllowMethods(), ",") | ||
| } | ||
|
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| if len(corsConfig.GetAllowHeaders()) > 0 { | ||
| corsHeaders["Access-Control-Allow-Headers"] = strings.Join(corsConfig.GetAllowHeaders(), ",") | ||
| } | ||
|
|
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| if len(corsConfig.GetExposeHeaders()) > 0 { | ||
| corsHeaders["Access-Control-Expose-Headers"] = strings.Join(corsConfig.GetExposeHeaders(), ",") | ||
| } | ||
|
|
||
| corsHeaders["Access-Control-Max-Age"] = strconv.FormatInt(int64(corsConfig.GetMaxAge()), 10) | ||
|
|
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| return &corsHeaders, nil | ||
| } | ||
|
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| func GetEnvKey(name string) string { | ||
| return fmt.Sprintf("NITRIC_CORS_%s", strings.ToUpper(name)) | ||
| } | ||
|
|
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| func CreateCorsMiddleware(cache map[string]map[string]string) base_http.HttpMiddleware { | ||
| return func(rc *fasthttp.RequestCtx, wp pool.WorkerPool) bool { | ||
| api := string(rc.Request.Header.Peek("x-nitric-api")) | ||
| method := string(rc.Request.Header.Method()) | ||
|
|
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| if cache[api] != nil { | ||
| applyCorsHeaders(rc, cache[api]) | ||
| return true | ||
| } | ||
|
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| corsHeaders, err := getCorsHeadersForAPI(api) | ||
| if err != nil { | ||
| if method == "OPTIONS" { | ||
| rc.Response.SetStatusCode(fasthttp.StatusMethodNotAllowed) | ||
| } | ||
|
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| return true | ||
| } | ||
|
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| cache[api] = corsHeaders | ||
|
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| applyCorsHeaders(rc, corsHeaders) | ||
|
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| return true | ||
| } | ||
| } | ||
|
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| func getCorsHeadersForAPI(name string) (map[string]string, error) { | ||
| env := os.Getenv(GetEnvKey(name)) | ||
|
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| if env == "" { | ||
| return nil, fmt.Errorf("no cors env var found for api %s", name) | ||
| } | ||
|
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| headers := make(map[string]string) | ||
|
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| // Unmarshal the JSON string into the map | ||
| err := json.Unmarshal([]byte(env), &headers) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| return headers, nil | ||
| } | ||
|
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| func applyCorsHeaders(rc *fasthttp.RequestCtx, corsHeaders map[string]string) { | ||
| for k, v := range corsHeaders { | ||
| rc.Response.Header.Add(k, v) | ||
| } | ||
| } |
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