go-gemini/request.go

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package gemini
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import (
"bufio"
"crypto/tls"
"io"
"net"
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"net/url"
)
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// A Request represents a Gemini request received by a server or to be sent
// by a client.
//
// The field semantics differ slightly between client and server usage.
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type Request struct {
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// URL specifies the URL being requested (for server
// requests) or the URL to access (for client requests).
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URL *url.URL
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// For client requests, Host optionally specifies the server to
// connect to. It may be of the form "host" or "host:port".
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// If empty, the value of URL.Host is used.
// For international domain names, Host may be in Punycode or
// Unicode form. Use golang.org/x/net/idna to convert it to
// either format if needed.
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// This field is ignored by the Gemini server.
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Host string
// For client requests, Certificate optionally specifies the
// TLS certificate to present to the other side of the connection.
// This field is ignored by the Gemini server.
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Certificate *tls.Certificate
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// RemoteAddr allows Gemini servers and other software to record
// the network address that sent the request, usually for
// logging. This field is not filled in by ReadRequest.
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// This field is ignored by the Gemini client.
RemoteAddr net.Addr
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// TLS allows Gemini servers and other software to record
// information about the TLS connection on which the request
// was received. This field is not filled in by ReadRequest.
// The Gemini server in this package sets the field for
// TLS-enabled connections before invoking a handler;
// otherwise it leaves the field nil.
// This field is ignored by the Gemini client.
TLS *tls.ConnectionState
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}
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// NewRequest returns a new request.
//
// The returned Request is suitable for use with Client.Do.
//
// Callers should be careful that the URL query is properly escaped.
// See the documentation for QueryEscape for more information.
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func NewRequest(rawurl string) (*Request, error) {
u, err := url.Parse(rawurl)
if err != nil {
return nil, err
}
return &Request{URL: u}, nil
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}
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// ReadRequest reads and parses an incoming request from r.
//
// ReadRequest is a low-level function and should only be used
// for specialized applications; most code should use the Server
// to read requests and handle them via the Handler interface.
func ReadRequest(r io.Reader) (*Request, error) {
// Read URL
r = io.LimitReader(r, 1026)
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br := bufio.NewReaderSize(r, 1026)
rawurl, err := br.ReadString('\r')
if err != nil {
return nil, err
}
// Read terminating line feed
if b, err := br.ReadByte(); err != nil {
return nil, err
} else if b != '\n' {
return nil, ErrInvalidRequest
}
// Trim carriage return
rawurl = rawurl[:len(rawurl)-1]
// Validate URL
if len(rawurl) > 1024 {
return nil, ErrInvalidRequest
}
u, err := url.Parse(rawurl)
if err != nil {
return nil, err
}
return &Request{URL: u}, nil
}
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// Write writes a Gemini request in wire format.
// This method consults the request URL only.
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func (r *Request) Write(w io.Writer) error {
bw := bufio.NewWriterSize(w, 1026)
url := r.URL.String()
if len(url) > 1024 {
return ErrInvalidRequest
}
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if _, err := bw.WriteString(url); err != nil {
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return err
}
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if _, err := bw.Write(crlf); err != nil {
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return err
}
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return bw.Flush()
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}