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dynamic.go
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dynamic.go
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// Copyright 2019 The New York Times Company
//
// 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 main
import (
"fmt"
"github.com/nytimes/httptest/functions"
)
// ProcessDynamicHeaders creates headers based on the function and adds them to the map of all headers.
func ProcessDynamicHeaders(dynamicHeaders []DynamicHeader, allHeaders map[string]string) error {
for _, dynamicHeader := range dynamicHeaders {
if _, present := allHeaders[dynamicHeader.Name]; present {
return fmt.Errorf("cannot process dynamic header %s; a header with that name is already defined", dynamicHeader.Name)
}
if fn, ok := funcMap[dynamicHeader.Function]; !ok {
return fmt.Errorf("unknown function %s", dynamicHeader.Function)
} else {
var err error
allHeaders[dynamicHeader.Name], err = fn(allHeaders, dynamicHeader.Args)
if err != nil {
return err
}
}
}
return nil
}
// Generic signature for any function that can resolve a dynamic header value.
type resolveHeader func(existingHeaders map[string]string, args []string) (string, error)
// Map of strings to dynamic header functions.
var funcMap = map[string]resolveHeader{
"now": functions.Now,
"signStringRS256PKCS8": functions.SignStringRS256PKCS8,
"postFormURLEncoded": functions.PostFormURLEncoded,
"concat": functions.Concat,
}