117 lines
2.7 KiB
Go
117 lines
2.7 KiB
Go
package gemini
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import (
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"bufio"
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"context"
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"crypto/tls"
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"io"
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"net"
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"net/url"
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)
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// Request represents a Gemini request.
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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 specifies the host on which the URL is sought.
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// Host must contain a port.
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//
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// This field is ignored by the server.
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Host string
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// Certificate specifies the TLS certificate to use for the request.
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//
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// On the server side, if the client provided a certificate then
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// Certificate.Leaf is guaranteed to be non-nil.
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Certificate *tls.Certificate
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// RemoteAddr allows servers and other software to record the network
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// address that sent the request.
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//
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// This field is ignored by the client.
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RemoteAddr net.Addr
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// TLS allows servers and other software to record information about the TLS
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// connection on which the request was received.
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//
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// This field is ignored by the client.
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TLS *tls.ConnectionState
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// Context specifies the context to use for client requests.
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// If Context is nil, the background context will be used.
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Context context.Context
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}
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// NewRequest returns a new request. The host is inferred from the URL.
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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 NewRequestFromURL(u), nil
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}
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// NewRequestFromURL returns a new request for the given URL.
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// The host is inferred from the URL.
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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 NewRequestFromURL(url *url.URL) *Request {
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host := url.Host
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if url.Port() == "" {
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host += ":1965"
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}
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return &Request{
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URL: url,
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Host: host,
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}
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}
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// ReadRequest reads a Gemini request from the provided io.Reader
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func ReadRequest(r io.Reader) (*Request, error) {
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// Read URL
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br := bufio.NewReader(r)
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rawurl, err := br.ReadString('\r')
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if err != nil {
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return nil, err
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}
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// Read terminating line feed
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if b, err := br.ReadByte(); err != nil {
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return nil, err
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} else if b != '\n' {
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return nil, ErrInvalidRequest
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}
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// Trim carriage return
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rawurl = rawurl[:len(rawurl)-1]
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// Validate URL
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if len(rawurl) > 1024 {
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return nil, ErrInvalidRequest
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}
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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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if u.User != nil {
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// User is not allowed
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return nil, ErrInvalidURL
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}
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return &Request{URL: u}, nil
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}
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// Write writes the Gemini request to the provided buffered writer.
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func (r *Request) Write(w *bufio.Writer) error {
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url := r.URL.String()
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// User is invalid
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if r.URL.User != nil || len(url) > 1024 {
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return ErrInvalidURL
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}
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if _, err := w.WriteString(url); err != nil {
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return err
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}
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if _, err := w.Write(crlf); err != nil {
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return err
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}
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return nil
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}
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