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|
package http
import (
"bufio"
"encoding/base64"
"errors"
"fmt"
"io"
"net/textproto"
"regexp"
"strconv"
"strings"
)
type Header map[string]string
type Request struct {
Method string
URI string
Proto string
Header Header
}
type Response struct {
Code int
Desc string
Proto string
Header Header
}
type handler func(string) error
var version = "HTTP/[0-9]+\\.[0-9]+"
var requestLine = regexp.MustCompile("^([A-Z]+) +([^ ]+) +(" + version + ")$")
var statusLine = regexp.MustCompile("^(" + version + ") +([0-9]+) +(.*)$")
var header = regexp.MustCompile("^([^ ]+) *: *(.*)$")
const OK = 200
func parseHeader(s string) (key, value string, ok bool) {
if m := header.FindStringSubmatch(s); m == nil {
return
} else {
return m[1], m[2], true
}
}
func addHeader(m Header, k, v string) Header {
if m == nil {
m = make(Header)
}
m[strings.Title(k)] = v
return m
}
func parse(r *bufio.Reader, init handler, f handler) error {
proto := textproto.NewReader(r)
first := true
for {
line, err := proto.ReadLine()
if err != nil {
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
return err
}
if first {
if err := init(line); err != nil {
return err
}
first = false
continue
}
if line == "" {
return nil
}
if err := f(line); err != nil {
return err
}
}
return nil
}
func ParseRequestLine(s string) (method, uri, proto string, ok bool) {
if m := requestLine.FindStringSubmatch(s); m == nil {
return
} else {
return m[1], m[2], m[3], true
}
}
func (r *Request) parseRequestLine(s string) error {
if method, uri, proto, ok := ParseRequestLine(s); !ok {
return errors.New("request line parse failed")
} else {
r.Method, r.URI, r.Proto = method, uri, proto
return nil
}
}
func (r *Request) parseHeader(s string) error {
if k, v, ok := parseHeader(s); !ok {
return errors.New("header parse failed")
} else {
r.Header = addHeader(r.Header, k, v)
return nil
}
}
func ParseRequest(r *bufio.Reader) (*Request, error) {
req := new(Request)
if err := parse(r, req.parseRequestLine, req.parseHeader); err != nil {
return nil, fmt.Errorf("http: bad request: %w", err)
}
return req, nil
}
func ParseStatusLine(s string) (proto string, code int, desc string, ok bool) {
if m := statusLine.FindStringSubmatch(s); m == nil {
return
} else if n, err := strconv.Atoi(m[2]); err != nil {
return
} else {
return m[1], n, m[3], true
}
}
func (r *Response) parseStatusLine(s string) error {
if proto, code, desc, ok := ParseStatusLine(s); !ok {
return errors.New("status line parse failed")
} else {
r.Code, r.Desc, r.Proto = code, desc, proto
return nil
}
}
func (r *Response) parseHeader(s string) error {
if k, v, ok := parseHeader(s); !ok {
return errors.New("header parse failed")
} else {
r.Header = addHeader(r.Header, k, v)
return nil
}
}
func ParseResponse(r *bufio.Reader) (*Response, error) {
resp := new(Response)
if err := parse(r, resp.parseStatusLine, resp.parseHeader); err != nil {
return nil, fmt.Errorf("http: bad response: %w", err)
}
return resp, nil
}
func BasicAuthEncode(s string) string {
encoded := base64.StdEncoding.EncodeToString([]byte(s))
return "Basic " + encoded
}
func BasicAuthCheck(origin string, encoded string) bool {
return BasicAuthEncode(origin) == encoded
}
|
