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// Copyright 2015 go-swagger maintainers
//
// 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 runtime
import (
"bufio"
"io"
"net/http"
"strings"
"github.com/go-openapi/swag"
)
// CanHaveBody returns true if this method can have a body
func CanHaveBody(method string) bool {
mn := strings.ToUpper(method)
return mn == "POST" || mn == "PUT" || mn == "PATCH" || mn == "DELETE"
}
// IsSafe returns true if this is a request with a safe method
func IsSafe(r *http.Request) bool {
mn := strings.ToUpper(r.Method)
return mn == "GET" || mn == "HEAD"
}
// AllowsBody returns true if the request allows for a body
func AllowsBody(r *http.Request) bool {
mn := strings.ToUpper(r.Method)
return mn != "HEAD"
}
// HasBody returns true if this method needs a content-type
func HasBody(r *http.Request) bool {
// happy case: we have a content length set
if r.ContentLength > 0 {
return true
}
if r.Header.Get(http.CanonicalHeaderKey("content-length")) != "" {
// in this case, no Transfer-Encoding should be present
// we have a header set but it was explicitly set to 0, so we assume no body
return false
}
rdr := newPeekingReader(r.Body)
r.Body = rdr
return rdr.HasContent()
}
func newPeekingReader(r io.ReadCloser) *peekingReader {
if r == nil {
return nil
}
return &peekingReader{
underlying: bufio.NewReader(r),
orig: r,
}
}
type peekingReader struct {
underlying interface {
Buffered() int
Peek(int) ([]byte, error)
Read([]byte) (int, error)
}
orig io.ReadCloser
}
func (p *peekingReader) HasContent() bool {
if p == nil {
return false
}
if p.underlying.Buffered() > 0 {
return true
}
b, err := p.underlying.Peek(1)
if err != nil {
return false
}
return len(b) > 0
}
func (p *peekingReader) Read(d []byte) (int, error) {
if p == nil {
return 0, io.EOF
}
return p.underlying.Read(d)
}
func (p *peekingReader) Close() error {
p.underlying = nil
if p.orig != nil {
return p.orig.Close()
}
return nil
}
// JSONRequest creates a new http request with json headers set
func JSONRequest(method, urlStr string, body io.Reader) (*http.Request, error) {
req, err := http.NewRequest(method, urlStr, body)
if err != nil {
return nil, err
}
req.Header.Add(HeaderContentType, JSONMime)
req.Header.Add(HeaderAccept, JSONMime)
return req, nil
}
// Gettable for things with a method GetOK(string) (data string, hasKey bool, hasValue bool)
type Gettable interface {
GetOK(string) ([]string, bool, bool)
}
// ReadSingleValue reads a single value from the source
func ReadSingleValue(values Gettable, name string) string {
vv, _, hv := values.GetOK(name)
if hv {
return vv[len(vv)-1]
}
return ""
}
// ReadCollectionValue reads a collection value from a string data source
func ReadCollectionValue(values Gettable, name, collectionFormat string) []string {
v := ReadSingleValue(values, name)
return swag.SplitByFormat(v, collectionFormat)
}
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