Move gemini code into its own module

3 files changed, 132 insertions, 0 deletions

diff --git a/gemini/gemini.go b/gemini/gemini.go
new file mode 100644
index 0000000..8f4c6ef
--- /dev/null
+++ b/gemini/gemini.go
@@ -0,0 +1,86 @@
+package gemini
+
+import (
+	"crypto/tls"
+	"fmt"
+	"net/url"
+	"os"
+	"strconv"
+	"strings"
+)
+
+const GeminiNetwork = "tcp"
+const GeminiPort = 1965
+const GeminiPrefix = "gemini://"
+
+func FormatRequest(request string) []byte {
+	if !strings.HasPrefix(request, GeminiPrefix) {
+		request = GeminiPrefix + request
+	}
+	request = request + "\r\n"
+	return []byte(request)
+}
+
+type GeminiConn struct {
+	host   string
+	config *tls.Config
+}
+
+func NewGeminiConn(host string, port int) *GeminiConn {
+	conf := tls.Config{
+		MinVersion:         tls.VersionTLS12,
+		InsecureSkipVerify: true,
+	}
+
+	if strings.Contains(host, ":") {
+		return &GeminiConn{host, &conf}
+	} else {
+		return &GeminiConn{host + ":" + strconv.Itoa(port), &conf}
+	}
+}
+
+func NewGeminiConnFromRequest(request string, port int) (*GeminiConn, error) {
+	if !strings.HasPrefix(request, GeminiPrefix) {
+		request = GeminiPrefix + request
+	}
+
+	u, err := url.Parse(request)
+	if err != nil {
+		return nil, err
+	}
+	return NewGeminiConn(u.Host, port), nil
+}
+
+func (c *GeminiConn) Get(request []byte, out *os.File) error {
+	conn, err := tls.Dial(GeminiNetwork, c.host, c.config)
+	if err != nil {
+		return err
+	}
+	defer conn.Close()
+
+	n, err := conn.Write(request)
+	if err != nil {
+		return err
+	}
+
+	buf := make([]byte, 1024)
+
+	for {
+		n, err = conn.Read(buf)
+		if err != nil {
+			return err
+		}
+		written, err := out.Write(buf[:n])
+		if written != n {
+			return fmt.Errorf("Got %d bytes, but only wrote %d bytes", n, written)
+		}
+		if err != nil {
+			return err
+		}
+
+		if n == 0 {
+			break
+		}
+	}
+	return nil
+}
diff --git a/gemini/gemini_test.go b/gemini/gemini_test.go
new file mode 100644
index 0000000..ffd2588
--- /dev/null
+++ b/gemini/gemini_test.go
@@ -0,0 +1,43 @@
+package gemini
+
+import (
+	"bytes"
+	"strconv"
+	"testing"
+)
+
+func TestNewGeminiConn(t *testing.T) {
+	tables := []struct {
+		url  string
+		port int
+		host string
+	}{
+		{"hostname.com", GeminiPort, "hostname.com:" + strconv.Itoa(GeminiPort)},
+		{"hostname.com", 1234, "hostname.com:1234"},
+	}
+
+	for _, table := range tables {
+		conn, err := NewGeminiConnFromRequest(table.url, table.port)
+		if err != nil {
+			t.Fatalf("NewGeminiConn error: %s", err.Error())
+		}
+		if conn.host != table.host {
+			t.Fatalf("NewGeminiConn error: wrong hostname %s", conn.host)
+		}
+	}
+}
+
+func TestFormatRequest(t *testing.T) {
+	tables := []struct {
+		input  string
+		output []byte
+	}{
+		{"hostname.com", []byte("gemini://hostname.com\r\n")},
+	}
+
+	for _, table := range tables {
+		if !bytes.Equal(FormatRequest(table.input), table.output) {
+			t.Fatalf("FormatRequest failed on: %s\n", table.input)
+		}
+	}
+}
diff --git a/gemini/go.mod b/gemini/go.mod
new file mode 100644
index 0000000..228a120
--- /dev/null
+++ b/gemini/go.mod
@@ -0,0 +1,3 @@
+module gemini
+
+go 1.16