podman

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// Copyright 2015 go-swagger maintainers
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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//    http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package runtime
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import (
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	"bufio"
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	"io"
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	"net/http"
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	"strings"
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	"github.com/go-openapi/swag"
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)
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// CanHaveBody returns true if this method can have a body
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func CanHaveBody(method string) bool {
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	mn := strings.ToUpper(method)
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	return mn == "POST" || mn == "PUT" || mn == "PATCH" || mn == "DELETE"
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}
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// IsSafe returns true if this is a request with a safe method
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func IsSafe(r *http.Request) bool {
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	mn := strings.ToUpper(r.Method)
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	return mn == "GET" || mn == "HEAD"
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}
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// AllowsBody returns true if the request allows for a body
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func AllowsBody(r *http.Request) bool {
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	mn := strings.ToUpper(r.Method)
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	return mn != "HEAD"
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}
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// HasBody returns true if this method needs a content-type
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func HasBody(r *http.Request) bool {
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	// happy case: we have a content length set
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	if r.ContentLength > 0 {
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		return true
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	}
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	if r.Header.Get("content-length") != "" {
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		// in this case, no Transfer-Encoding should be present
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		// we have a header set but it was explicitly set to 0, so we assume no body
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		return false
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	}
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	rdr := newPeekingReader(r.Body)
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	r.Body = rdr
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	return rdr.HasContent()
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}
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func newPeekingReader(r io.ReadCloser) *peekingReader {
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	if r == nil {
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		return nil
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	}
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	return &peekingReader{
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		underlying: bufio.NewReader(r),
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		orig:       r,
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	}
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}
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type peekingReader struct {
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	underlying interface {
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		Buffered() int
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		Peek(int) ([]byte, error)
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		Read([]byte) (int, error)
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	}
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	orig io.ReadCloser
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}
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func (p *peekingReader) HasContent() bool {
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	if p == nil {
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		return false
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	}
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	if p.underlying.Buffered() > 0 {
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		return true
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	}
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	b, err := p.underlying.Peek(1)
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	if err != nil {
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		return false
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	}
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	return len(b) > 0
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}
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func (p *peekingReader) Read(d []byte) (int, error) {
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	if p == nil {
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		return 0, io.EOF
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	}
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	return p.underlying.Read(d)
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}
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func (p *peekingReader) Close() error {
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	p.underlying = nil
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	if p.orig != nil {
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		return p.orig.Close()
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	}
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	return nil
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}
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// JSONRequest creates a new http request with json headers set
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func JSONRequest(method, urlStr string, body io.Reader) (*http.Request, error) {
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	req, err := http.NewRequest(method, urlStr, body)
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	if err != nil {
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		return nil, err
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	}
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	req.Header.Add(HeaderContentType, JSONMime)
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	req.Header.Add(HeaderAccept, JSONMime)
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	return req, nil
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}
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// Gettable for things with a method GetOK(string) (data string, hasKey bool, hasValue bool)
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type Gettable interface {
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	GetOK(string) ([]string, bool, bool)
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}
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// ReadSingleValue reads a single value from the source
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func ReadSingleValue(values Gettable, name string) string {
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	vv, _, hv := values.GetOK(name)
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	if hv {
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		return vv[len(vv)-1]
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	}
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	return ""
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}
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// ReadCollectionValue reads a collection value from a string data source
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func ReadCollectionValue(values Gettable, name, collectionFormat string) []string {
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	v := ReadSingleValue(values, name)
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	return swag.SplitByFormat(v, collectionFormat)
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}
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