108 lines
2.7 KiB
Go
108 lines
2.7 KiB
Go
package gemini
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import (
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"bufio"
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"crypto/tls"
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"io"
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"net/url"
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)
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// A Request represents a Gemini request received by a server or to be sent
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// by a client.
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type Request struct {
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// URL specifies the URL being requested.
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URL *url.URL
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// For client requests, Host optionally specifies the server to
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// 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.
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// For international domain names, Host may be in Punycode or
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// Unicode form. Use golang.org/x/net/idna to convert it to
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// either format if needed.
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// This field is ignored by the Gemini server.
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Host string
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// For client requests, Certificate optionally specifies the
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// TLS certificate to present to the other side of the connection.
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// This field is ignored by the Gemini server.
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Certificate *tls.Certificate
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TLS *tls.ConnectionState
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}
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// NewRequest returns a new request.
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// The returned Request is suitable for use with Client.Do.
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//
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// Callers should be careful that the URL query is properly escaped.
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// See the documentation for QueryEscape for more information.
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func NewRequest(rawurl string) (*Request, error) {
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u, err := url.Parse(rawurl)
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if err != nil {
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return nil, err
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}
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return &Request{URL: u}, nil
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}
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// ReadRequest reads and parses an incoming request from r.
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//
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// ReadRequest is a low-level function and should only be used
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// for specialized applications; most code should use the Server
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// to read requests and handle them via the Handler interface.
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func ReadRequest(r io.Reader) (*Request, error) {
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// Limit request size
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r = io.LimitReader(r, 1026)
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br := bufio.NewReaderSize(r, 1026)
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b, err := br.ReadBytes('\n')
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if err != nil {
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if err == io.EOF {
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return nil, ErrInvalidRequest
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}
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return nil, err
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}
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// Read URL
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rawurl, ok := trimCRLF(b)
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if !ok {
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return nil, ErrInvalidRequest
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}
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if len(rawurl) == 0 {
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return nil, ErrInvalidRequest
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}
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u, err := url.Parse(string(rawurl))
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if err != nil {
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return nil, err
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}
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return &Request{URL: u}, nil
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}
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// WriteTo writes r to w in the Gemini request format.
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// This method consults the request URL only.
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func (r *Request) WriteTo(w io.Writer) (int64, error) {
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bw := bufio.NewWriterSize(w, 1026)
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url := r.URL.String()
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if len(url) > 1024 {
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return 0, ErrInvalidRequest
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}
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var wrote int64
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n, err := bw.WriteString(url)
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wrote += int64(n)
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if err != nil {
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return wrote, err
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}
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n, err = bw.Write(crlf)
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wrote += int64(n)
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if err != nil {
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return wrote, err
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}
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return wrote, bw.Flush()
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}
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// ServerName returns the value of the TLS Server Name Indication extension
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// sent by the client.
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// ServerName returns an empty string for client requests.
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func (r *Request) ServerName() string {
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if tls := r.TLS; tls != nil {
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return tls.ServerName
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}
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return ""
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}
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