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rpc.go
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rpc.go
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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cloudprint
import (
"bytes"
"crypto/rand"
"encoding/json"
"fmt"
"io"
"log"
"mime/multipart"
"net/http"
"net/http/httptest"
"os/exec"
"strings"
"code.google.com/p/goauth2/oauth"
)
const cloudprintURL = "https://www.google.com/cloudprint"
type multipartRequest struct {
buf bytes.Buffer
*multipart.Writer
}
func (mr *multipartRequest) init() {
mr.Writer = multipart.NewWriter(&mr.buf)
}
type jsonStatus struct {
Success bool
Message string
}
func jsonRPC(auth *Auth, verb, url string, mr *multipartRequest, dst interface{}) error {
var reader io.Reader
if mr != nil {
if auth.ProxyID != "" {
mr.WriteField("proxy", auth.ProxyID)
}
mr.Writer.Close()
reader = &mr.buf
}
req, err := http.NewRequest(verb, url, reader)
if err != nil {
return err
}
if i := strings.Index(url, "?"); i >= 0 {
url = url[:i]
}
if mr != nil {
req.Header.Set("Content-Type", mr.FormDataContentType())
}
if auth.ProxyID != "" {
req.Header.Set("X-CloudPrint-Proxy", auth.ProxyID)
}
var client *http.Client
if auth.Token.AccessToken != "" {
var tr oauth.Transport
tr.Config = &oauth.Config{
ClientId: auth.APIClientID,
ClientSecret: auth.APIClientSecret,
Scope: "https://www.googleapis.com/auth/cloudprint https://www.googleapis.com/auth/googletalk",
AuthURL: "https://accounts.google.com/o/oauth2/auth",
TokenURL: "https://accounts.google.com/o/oauth2/token",
RedirectURL: "oob",
}
tr.Token = &auth.Token
client = tr.Client()
} else {
client = http.DefaultClient
}
resp, err := client.Do(req)
if err != nil {
return fmt.Errorf("%s %s: %v", verb, url, err)
}
defer resp.Body.Close()
var buf bytes.Buffer
_, err = io.Copy(&buf, resp.Body)
if err != nil {
return fmt.Errorf("%s %s: reading HTTP response: %v", verb, url, err)
}
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("%s %s: %s\n%s", verb, url, resp.Status, buf.Bytes())
}
fmt.Printf("%s\n", buf.Bytes())
var js jsonStatus
if err := json.Unmarshal(buf.Bytes(), &js); err != nil {
return fmt.Errorf("%s %s: invalid JSON response: %v", verb, url, err)
}
if !js.Success {
suffix := ""
if js.Message != "" {
msg := js.Message
if len(msg) > 2 && 'A' <= msg[0] && msg[0] <= 'Z' && 'a' <= msg[1] && msg[1] <= 'z' {
msg = string(msg[0]+'a'-'A') + msg[1:]
}
suffix = ": " + msg
} else {
suffix = "\n" + buf.String()
}
return fmt.Errorf("%s %s: server rejected request%s", verb, url, suffix)
}
if dst != nil {
if err := json.Unmarshal(buf.Bytes(), dst); err != nil {
return fmt.Errorf("%s %s: invalid JSON response: %v", verb, url, err)
}
}
return nil
}
func httpGET(auth *Auth, url string) ([]byte, error) {
verb := "GET"
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return nil, err
}
if i := strings.Index(url, "?"); i >= 0 {
url = url[:i]
}
req.Header.Set("X-CloudPrint-Proxy", auth.ProxyID)
var client *http.Client
if auth.Token.AccessToken != "" {
var tr oauth.Transport
tr.Config = &oauth.Config{
ClientId: auth.APIClientID,
ClientSecret: auth.APIClientSecret,
Scope: "https://www.googleapis.com/auth/cloudprint https://www.googleapis.com/auth/googletalk",
AuthURL: "https://accounts.google.com/o/oauth2/auth",
TokenURL: "https://accounts.google.com/o/oauth2/token",
RedirectURL: "oob",
}
tr.Token = &auth.Token
client = tr.Client()
} else {
client = http.DefaultClient
}
resp, err := client.Do(req)
if err != nil {
return nil, fmt.Errorf("%s %s: %v", verb, url, err)
}
defer resp.Body.Close()
var buf bytes.Buffer
_, err = io.Copy(&buf, resp.Body)
if err != nil {
return nil, fmt.Errorf("%s %s: reading HTTP response: %v", verb, url, err)
}
// TODO: Check 200
return buf.Bytes(), nil
}
// RandomID returns a new random ID, for use as a proxy ID or printer ID.
func RandomID() (string, error) {
buf := make([]byte, 16)
_, err := io.ReadFull(rand.Reader, buf)
if err != nil {
return "", fmt.Errorf("RandomID: reading rand.Reader: %v", err)
}
return fmt.Sprintf("%x", buf), nil
}
// AuthUser launches a web browser to ask the user to authenticate
// and records the resulting token.
func AuthUser(auth Auth) (Auth, error) {
// TODO: Stop using package log, package httptest.
config := &oauth.Config{
ClientId: auth.APIClientID,
ClientSecret: auth.APIClientSecret,
Scope: "https://www.googleapis.com/auth/cloudprint https://www.googleapis.com/auth/googletalk",
AuthURL: "https://accounts.google.com/o/oauth2/auth",
TokenURL: "https://accounts.google.com/o/oauth2/token",
}
ch := make(chan string)
randState, err := RandomID()
if err != nil {
return Auth{}, err
}
ts := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
if req.URL.Path == "/favicon.ico" {
http.Error(rw, "", 404)
return
}
if req.FormValue("state") != randState {
log.Printf("State doesn't match: req = %#v", req)
http.Error(rw, "", 500)
return
}
if code := req.FormValue("code"); code != "" {
fmt.Fprintf(rw, "<h1>Success</h1>Authorized.")
rw.(http.Flusher).Flush()
ch <- code
return
}
log.Printf("no code")
http.Error(rw, "", 500)
}))
defer ts.Close()
config.RedirectURL = ts.URL
authURL := config.AuthCodeURL(randState)
go openURL(authURL)
log.Printf("Authorize this app at: %s", authURL)
code := <-ch
log.Printf("Got code: %s", code)
t := &oauth.Transport{
Config: config,
Transport: http.DefaultTransport,
}
_, err = t.Exchange(code)
if err != nil {
log.Fatalf("Token exchange error: %v", err)
}
auth.Token = *t.Token
return auth, nil
}
func openURL(url string) {
try := []string{"xdg-open", "google-chrome", "open"}
for _, bin := range try {
err := exec.Command(bin, url).Run()
if err == nil {
return
}
}
log.Printf("Error opening URL in browser.")
}
type JobStatus string
const (
JobQueued JobStatus = "QUEUED"
JobInProgress JobStatus = "IN_PROGRESS"
JobDone JobStatus = "DONE"
JobError JobStatus = "ERROR"
)
type PrinterStatus string
const (
PrinterOnline PrinterStatus = "ONLINE"
PrinterUnknown PrinterStatus = "UNKNOWN"
PrinterOffline PrinterStatus = "OFFLINE"
PrinterDormant PrinterStatus = "DORMANT"
)