client: Remove GetInput and CheckRedirect callbacks

examples/client.go

@@ -9,6 +9,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"log"
+	"net/url"
 	"os"
 	"path/filepath"
 	"time"
@@ -17,6 +18,22 @@ import (
 	"git.sr.ht/~adnano/go-xdg"
 )
 
+var (
+	hosts   gemini.KnownHostsFile
+	scanner *bufio.Scanner
+)
+
+func init() {
+	// Load known hosts file
+	path := filepath.Join(xdg.DataHome(), "gemini", "known_hosts")
+	err := hosts.Load(path)
+	if err != nil {
+		log.Println(err)
+	}
+
+	scanner = bufio.NewScanner(os.Stdin)
+}
+
 const trustPrompt = `The certificate offered by %s is of unknown trust. Its fingerprint is:
 %s
 
@@ -26,49 +43,79 @@ Otherwise, this should be safe to trust.
 [t]rust always; trust [o]nce; [a]bort
 => `
 
+func trustCertificate(hostname string, cert *x509.Certificate) error {
+	knownHost, ok := hosts.Lookup(hostname)
+	if ok && time.Now().Before(knownHost.Expires) {
+		// Certificate is in known hosts file and is not expired
+		return nil
+	}
+
+	fingerprint := gemini.NewFingerprint(cert.Raw, cert.NotAfter)
+	fmt.Printf(trustPrompt, hostname, fingerprint.Hex)
+	scanner.Scan()
+	switch scanner.Text() {
+	case "t":
+		hosts.Add(hostname, fingerprint)
+		hosts.Write(hostname, fingerprint)
+		return nil
+	case "o":
+		hosts.Add(hostname, fingerprint)
+		return nil
+	default:
+		return errors.New("certificate not trusted")
+	}
+}
+
+func getInput(prompt string, sensitive bool) (input string, ok bool) {
+	fmt.Printf("%s ", prompt)
+	scanner.Scan()
+	return scanner.Text(), true
+}
+
+func do(req *gemini.Request, via []*gemini.Request) (*gemini.Response, error) {
+	client := gemini.Client{
+		TrustCertificate: trustCertificate,
+	}
+	resp, err := client.Do(req)
+	if err != nil {
+		return resp, err
+	}
+
+	switch resp.Status.Class() {
+	case gemini.StatusClassInput:
+		input, ok := getInput(resp.Meta, resp.Status == gemini.StatusSensitiveInput)
+		if !ok {
+			break
+		}
+		req.URL.ForceQuery = true
+		req.URL.RawQuery = gemini.QueryEscape(input)
+		return do(req, via)
+
+	case gemini.StatusClassRedirect:
+		via = append(via, req)
+		if len(via) > 5 {
+			return resp, errors.New("too many redirects")
+		}
+
+		target, err := url.Parse(resp.Meta)
+		if err != nil {
+			return resp, err
+		}
+		target = req.URL.ResolveReference(target)
+		redirect := *req
+		redirect.URL = target
+		return do(&redirect, via)
+	}
+
+	return resp, err
+}
+
 func main() {
 	if len(os.Args) < 2 {
-		fmt.Printf("usage: %s <url> [host]", os.Args[0])
+		fmt.Printf("usage: %s <url> [host]\n", os.Args[0])
 		os.Exit(1)
 	}
 
-	// Load known hosts file
-	var knownHosts gemini.KnownHostsFile
-	if err := knownHosts.Load(filepath.Join(xdg.DataHome(), "gemini", "known_hosts")); err != nil {
-		log.Println(err)
-	}
-
-	scanner := bufio.NewScanner(os.Stdin)
-
-	var client gemini.Client
-	client.TrustCertificate = func(hostname string, cert *x509.Certificate) error {
-		knownHost, ok := knownHosts.Lookup(hostname)
-		if ok && time.Now().Before(knownHost.Expires) {
-			// Certificate is in known hosts file and is not expired
-			return nil
-		}
-
-		fingerprint := gemini.NewFingerprint(cert.Raw, cert.NotAfter)
-		fmt.Printf(trustPrompt, hostname, fingerprint.Hex)
-		scanner.Scan()
-		switch scanner.Text() {
-		case "t":
-			knownHosts.Add(hostname, fingerprint)
-			knownHosts.Write(hostname, fingerprint)
-			return nil
-		case "o":
-			knownHosts.Add(hostname, fingerprint)
-			return nil
-		default:
-			return errors.New("certificate not trusted")
-		}
-	}
-	client.GetInput = func(prompt string, sensitive bool) (string, bool) {
-		fmt.Printf("%s ", prompt)
-		scanner.Scan()
-		return scanner.Text(), true
-	}
-
 	// Do the request
 	url := os.Args[1]
 	req, err := gemini.NewRequest(url)
@@ -79,7 +126,7 @@ func main() {
 	if len(os.Args) == 3 {
 		req.Host = os.Args[2]
 	}
-	resp, err := client.Do(req)
+	resp, err := do(req, nil)
 	if err != nil {
 		fmt.Println(err)
 		os.Exit(1)