go-gemini/response.go

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2020-10-24 13:15:32 -06:00
package gemini
2020-10-21 15:07:28 -06:00
import (
"bufio"
"crypto/tls"
"io/ioutil"
"strconv"
)
// Response is a Gemini response.
type Response struct {
// Status represents the response status.
Status int
// Meta contains more information related to the response status.
// For successful responses, Meta should contain the mimetype of the response.
// For failure responses, Meta should contain a short description of the failure.
// Meta should not be longer than 1024 bytes.
Meta string
// Body contains the response body.
Body []byte
// TLS contains information about the TLS connection on which the response
// was received.
TLS tls.ConnectionState
}
// read reads a Gemini response from the provided buffered reader.
func (resp *Response) read(r *bufio.Reader) error {
// Read the status
statusB := make([]byte, 2)
if _, err := r.Read(statusB); err != nil {
return err
}
status, err := strconv.Atoi(string(statusB))
if err != nil {
return err
}
resp.Status = status
// Disregard invalid status codes
const minStatus, maxStatus = 1, 6
statusClass := status / 10
if statusClass < minStatus || statusClass > maxStatus {
return ErrInvalidResponse
}
// Read one space
if b, err := r.ReadByte(); err != nil {
return err
} else if b != ' ' {
return ErrInvalidResponse
}
// Read the meta
meta, err := r.ReadString('\r')
if err != nil {
return err
}
// Trim carriage return
meta = meta[:len(meta)-1]
// Ensure meta is less than or equal to 1024 bytes
if len(meta) > 1024 {
return ErrInvalidResponse
}
resp.Meta = meta
// Read terminating newline
if b, err := r.ReadByte(); err != nil {
return err
} else if b != '\n' {
return ErrInvalidResponse
}
// Read response body
if status/10 == StatusClassSuccess {
var err error
resp.Body, err = ioutil.ReadAll(r)
if err != nil {
return err
}
}
return nil
}