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autoscan.go
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autoscan.go
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/*
Autoscan - Automate scanning from USB to Google Drive using a Raspberry Pi.
Example usage:
./autoscan \
-templates src/github.com/ThomasHabets/autoscan/web/templates/ \
-scanimage $(pwd)/src/github.com/ThomasHabets/autoscan/extra/scanimage-wrap \
-static src/github.com/ThomasHabets/autoscan/web/static/ \
-listen :8080
*/
package main
import (
"flag"
"fmt"
"io/ioutil"
"log"
"net"
"net/http"
"net/http/fcgi"
"os"
"path"
"strings"
"time"
drivedulib "github.com/ThomasHabets/drive-du/lib"
oauth "golang.org/x/oauth2"
drive "google.golang.org/api/drive/v2"
"github.com/ThomasHabets/autoscan/adafruit"
"github.com/ThomasHabets/autoscan/backend"
//"github.com/ThomasHabets/autoscan/backend/leds"
"github.com/ThomasHabets/autoscan/buttons"
"github.com/ThomasHabets/autoscan/web"
)
const (
// BasePath is where are the GPIO special files are.
BasePath = "/sys/class/gpio"
scope = "https://www.googleapis.com/auth/drive"
accessType = "offline"
)
var (
listen = flag.String("listen", "", "Address to listen to.")
listenFCGI = flag.String("listen_fcgi", "", "FCGI Address to listen to.")
socketPath = flag.String("socket", "", "UNIX socket to listen to for FCGI.")
logfile = flag.String("logfile", "", "Where to log. If not specified will log to stdout.")
configFile = flag.String("config", ".autoscan", "Config file.")
configure = flag.Bool("configure", false, "Create config file.")
tmplDir = flag.String("templates", "", "Directory with HTML templates.")
staticDir = flag.String("static", "", "Directory with static files.")
useButtons = flag.Bool("use_buttons", false, "Enable buttons.")
useLEDs = flag.Bool("use_leds", false, "Use LEDs.")
useAdafruit = flag.Bool("use_adafruit", false, "Use Adafruit 16x2 LCD display.")
// Externals
scanimage = flag.String("scanimage", "scanimage", "Scanimage binary from SANE.")
convert = flag.String("convert", "convert", "Convert binary from ImageMagick.")
pinButtonSingle = flag.Int("pin_single", 5, "GPIO PIN for 'scan single'.")
pinButtonDuplex = flag.Int("pin_duplex", 6, "GPIO PIN for 'scan duplex'.")
pinButton3 = flag.Int("pin_ack", 24, "GPIO PIN for 'ACK'.")
pinButton4 = flag.Int("pin_reboot", 25, "GPIO PIN for 'reboot'.")
pinLED1a = flag.Int("pin_led1_a", 27, "GPIO PIN for LED 1 PIN 1/2.")
pinLED1b = flag.Int("pin_led1_b", 23, "GPIO PIN for LED 1 PIN 2/2.")
pinLED2a = flag.Int("pin_led2_a", 17, "GPIO PIN for LED 2 PIN 1/2.")
pinLED2b = flag.Int("pin_led2_b", 22, "GPIO PIN for LED 2 PIN 2/2.")
)
type nullUI struct{}
func (*nullUI) Msg(status, msg string) {}
func (*nullUI) Run() {}
func oauthConfig(id, secret string) *oauth.Config {
return &oauth.Config{
ClientID: id,
ClientSecret: secret,
Endpoint: oauth.Endpoint{
AuthURL: "https://accounts.google.com/o/oauth2/auth",
TokenURL: "https://accounts.google.com/o/oauth2/token",
},
Scopes: []string{scope},
RedirectURL: "urn:ietf:wg:oauth:2.0:oob",
//AccessType: "offline",
}
}
func serveFCGI(m *http.ServeMux) error {
if err := os.Remove(*socketPath); err != nil {
log.Printf("Removing old socket %q: %v", *socketPath, err)
}
sock, err := net.Listen("unix", *socketPath)
if err != nil {
log.Fatal("Unable to listen to socket: ", err)
}
if err = os.Chmod(*socketPath, 0666); err != nil {
log.Fatal("Unable to chmod socket: ", err)
}
return fcgi.Serve(sock, m)
}
func serveFCGIPort(m *http.ServeMux) error {
sock, err := net.Listen("tcp", *listenFCGI)
if err != nil {
log.Fatalf("Unable to listen to socket %q: %v", *listenFCGI, err)
}
return fcgi.Serve(sock, m)
}
func servePort(m *http.ServeMux) error {
return http.ListenAndServe(*listen, m)
}
type config struct {
clientID, clientSecret, refreshToken string
parent string
}
func readConfig() (*config, error) {
b, err := ioutil.ReadFile(*configFile)
if err != nil {
return nil, err
}
s := strings.SplitN(strings.Trim(string(b), "\n\r "), "\n", 4)
return &config{
clientID: s[0],
clientSecret: s[1],
refreshToken: s[2],
parent: s[3],
}, nil
}
func export(n int) error {
if err := func() error {
f, err := os.OpenFile(path.Join(BasePath, "export"), os.O_WRONLY, 0660)
if err != nil {
return err
}
defer f.Close()
fmt.Fprintf(f, "%d\n", n)
return nil
}(); err != nil {
return err
}
start := time.Now()
for {
time.Sleep(50 * time.Millisecond)
_, err := os.Stat(path.Join(BasePath, fmt.Sprintf("gpio%d", n), "direction"))
if err != nil {
if time.Since(start) > 10*time.Second {
return err
}
continue
}
_, err = os.Stat(path.Join(BasePath, fmt.Sprintf("gpio%d", n), "value"))
if err != nil {
if time.Since(start) > 10*time.Second {
return err
}
continue
}
return nil
}
}
func setDirection(n int, dir string) error {
start := time.Now()
if err := func() error {
for {
f, err := os.OpenFile(path.Join(BasePath, fmt.Sprintf("gpio%d", n), "direction"), os.O_WRONLY, 0660)
if err != nil {
if time.Since(start) > 10*time.Second {
return err
}
time.Sleep(50 * time.Millisecond)
continue
}
defer f.Close()
fmt.Fprintf(f, dir+"\n")
return nil
}
}(); err != nil {
return err
}
for {
s, err := ioutil.ReadFile(path.Join(BasePath, fmt.Sprintf("gpio%d", n), "direction"))
if err != nil {
return err
}
if string(s) == dir+"\n" {
return nil
}
time.Sleep(50 * time.Millisecond)
}
}
func main() {
flag.Parse()
if *configFile == "" {
log.Fatalf("-config is mandatory")
}
if *configure {
conf, err := drivedulib.Configure(scope, "offline", "", "")
if err != nil {
log.Fatalf("Failed to configure: %v", err)
}
folder, err := drivedulib.ReadLine("Folder ID: ")
if err != nil {
log.Fatalf("Unable to read folder ID: %v", err)
}
if err := ioutil.WriteFile(*configFile, []byte(fmt.Sprintf("%s\n%s\n%s\n%s\n", conf.OAuth.ClientID, conf.OAuth.ClientSecret, conf.OAuth.RefreshToken, folder)), 0600); err != nil {
log.Fatalf("Failed to write config file: %v", err)
}
return
}
log.SetFlags(log.Ldate | log.Ltime | log.Lshortfile)
if *logfile != "" {
f, err := os.OpenFile(*logfile, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0660)
if err != nil {
log.Fatalf("Opening logfile %q: %v", *logfile, err)
}
log.SetOutput(f)
}
if *staticDir == "" {
log.Fatalf("-static is mandatory.")
}
if *tmplDir == "" {
log.Fatalf("-templates is mandatory.")
}
{
a, b, c := *listen != "", *listenFCGI != "", *socketPath != ""
if (a && (b || c)) || (b && (a || c)) || (c && (a || b)) {
log.Fatalf("Exactly one of -listen, listen_fcgi and -socket must be specified.")
}
}
if *useButtons || *useAdafruit || *useLEDs {
// Set up GPIO ports race-free.
for _, n := range []int{
*pinLED1a,
*pinLED1b,
*pinLED2a,
*pinLED2b,
} {
if err := export(n); err != nil {
log.Fatalf("export(%d): %v", n, err)
}
if err := setDirection(n, "out"); err != nil {
log.Fatalf("setDirection(%d, out): %v", n, err)
}
}
for _, n := range []int{
*pinButtonSingle,
*pinButtonDuplex,
*pinButton3,
*pinButton4,
} {
if err := export(n); err != nil {
log.Fatalf("export(%d): %v", n, err)
}
if err := setDirection(n, "in"); err != nil {
log.Fatalf("setDirection(%d, in): %v", n, err)
}
}
}
if *useLEDs {
/*
// Status LED: Blink when this daemon is running.
status := make(chan leds.LEDMode)
_, err := leds.LEDController(*pinLED1a, *pinLED1b, status)
if err != nil {
log.Fatalf("Status LED: %v", err)
}
status <- leds.GREEN
status <- leds.BLINK
// Progress LED:
// * Solid green or red showing last status, ready for new scan.
// * Blinking green while "in progress".
progress := make(chan leds.LEDMode)
_, err = leds.LEDController(*pinLED2a, *pinLED2b, progress)
if err != nil {
log.Fatalf("Progress LED: %v", err)
}
progress <- leds.GREEN
*/
}
cfg, err := readConfig()
if err != nil {
log.Fatal(err)
}
authedClient, err := drivedulib.Connect(drivedulib.ConfigOAuth{
ClientID: cfg.clientID,
ClientSecret: cfg.clientSecret,
RefreshToken: cfg.refreshToken,
}, scope, accessType)
if err != nil {
log.Fatal(err)
}
d, err := drive.New(authedClient)
if err != nil {
log.Fatalf("Creating Google Drive client: %v", err)
}
b := backend.Backend{
Scanimage: *scanimage,
Convert: *convert,
ParentDir: cfg.parent,
Drive: d,
UI: &nullUI{},
//Progress: progress,
}
f := web.New(d, cfg.parent, *tmplDir, *staticDir, &b)
if *useButtons {
btns, err := buttons.New(*pinButtonSingle, *pinButtonDuplex, *pinButton3, *pinButton4)
if err != nil {
log.Fatalf("Setting up buttons: %v", err)
}
btns.Backend = &b
//btns.Progress = progress
go btns.Run()
}
if *useAdafruit {
btns, err := adafruit.New(&b)
if err != nil {
log.Fatalf("Setting up adafruit: %v", err)
}
go btns.Run()
b.UI = btns
}
b.UI.Msg("IDLE", "Autoscan Ready.|Just started.")
log.Printf("Running.")
if *listen != "" {
servePort(f.Mux)
} else if *listenFCGI != "" {
serveFCGIPort(f.Mux)
} else {
serveFCGI(f.Mux)
}
}