/
get.go
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/
get.go
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// Steve Phillips / elimisteve
// 2017.01.14
package share
import (
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"log"
"net/http"
"strings"
"github.com/cryptag/cryptag/backend"
"github.com/cryptag/cryptag/types"
minilock "github.com/cryptag/go-minilock"
"github.com/cryptag/go-minilock/taber"
)
var (
ErrInvalidInviteURL = errors.New("share: invalid invite URL")
)
// Share represents a(n originally miniLock-encrypted) "share" --
// something that has been shared via a share server.
type Share struct {
SenderID string
Filename string
Contents []byte
}
func GetConfigsByInviteURL(url string) ([]*backend.Config, error) {
return toConfigs(GetSharesByInviteURL(url))
}
func GetSharesByInviteURL(inviteURL string) ([]*Share, error) {
serverBaseURL, passphrase, err := ParseInviteURL(inviteURL)
if err != nil {
return nil, err
}
client := NewClient(serverBaseURL)
return GetShares(client, EmailFromPassphrase(passphrase), passphrase)
}
func ParseInviteURL(url string) (serverBaseURL, passphrase string, err error) {
strs := strings.Split(url, "#")
if len(strs) != 2 {
return "", "", ErrInvalidInviteURL
}
// TODO: Consider doing more validity checks
serverBaseURL = strings.TrimRight(strs[0], "/")
passphrase = strs[1]
return serverBaseURL, passphrase, nil
}
// GetShares fetches all shares for the user with the given email and
// passphrase.
func GetShares(cl *Client, recipEmail, recipPassphrase string) ([]*Share, error) {
keypair, err := taber.FromEmailAndPassphrase(recipEmail, recipPassphrase)
if err != nil {
return nil, err
}
return GetSharesByKeypair(cl, keypair)
}
func GetConfigsByKeypair(cl *Client, keypair *taber.Keys) ([]*backend.Config, error) {
return toConfigs(GetSharesByKeypair(cl, keypair))
}
// GetShares fetches all shares for the user with the given keypair.
func GetSharesByKeypair(cl *Client, keypair *taber.Keys) ([]*Share, error) {
resp, err := Get(cl, "/shares/once", keypair)
if err != nil {
return nil, err
}
defer resp.Body.Close()
// TODO: Stream the response
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("Wanted HTTP %d, got %d; body: %s",
http.StatusOK, resp.StatusCode, body)
}
// Slice of miniLock-encrypted files
var allsharesb [][]byte
err = json.Unmarshal(body, &allsharesb)
if err != nil {
return nil, err
}
shares := make([]*Share, 0, len(allsharesb))
var errs []string
for _, shareb := range allsharesb {
senderID, filename, contents, err := minilock.DecryptFileContents(
shareb, keypair)
if err != nil {
errs = append(errs, err.Error())
continue
}
share := &Share{
SenderID: senderID,
Filename: filename,
Contents: contents,
}
shares = append(shares, share)
}
if len(errs) != 0 {
err = fmt.Errorf("share: %d error(s) decrypting shares: %s",
len(errs), strings.Join(errs, "; "))
}
return shares, err
}
// Get does an authenticated GET request to serverBaseURL+path. If
// authToken is empty or stale, this function will log into the server
// to get a new auth token, and _then_ execute the GET.
func Get(cl *Client, path string, keypair *taber.Keys) (*http.Response, error) {
if cl.AuthToken == "" {
token, err := Login(cl, keypair)
if err != nil {
return nil, err
}
if types.Debug {
log.Printf("Get: logged in; decrypted auth token: `%v`\n", token)
}
cl.AuthToken = token
}
req, err := http.NewRequest("GET", cl.ServerBaseURL+path, nil)
if err != nil {
return nil, err
}
req.Header.Add("Authorization", "Bearer "+cl.AuthToken)
resp, err := cl.Client.Do(req)
if err != nil {
return nil, err
}
if resp.StatusCode == http.StatusUnauthorized {
if types.Debug {
log.Println("Unauthorized GET; logging in again to get new auth token")
}
newAuthToken, err := Login(cl, keypair)
if err != nil {
return nil, err
}
cl.AuthToken = newAuthToken
req.Header["Authorization"] = []string{"Bearer " + newAuthToken}
return getErrChecks(cl.Client.Do(req))
}
return getErrChecks(resp, err)
}
func getErrChecks(resp *http.Response, err error) (*http.Response, error) {
if resp.StatusCode != http.StatusOK {
defer resp.Body.Close()
body, _ := ioutil.ReadAll(resp.Body)
if resp.StatusCode == http.StatusNotFound {
m := map[string]string{}
err = json.Unmarshal(body, &m)
if err != nil {
return nil, fmt.Errorf("Error parsing 404: %v", err)
}
return nil, errors.New(m["error"])
}
return nil, fmt.Errorf("Got HTTP %v, wanted %v; response: %s",
resp.StatusCode, http.StatusOK, body)
}
return resp, nil
}
func Login(cl *Client, keypair *taber.Keys) (authToken string, err error) {
if types.Debug {
log.Printf("Logging into server `%s`\n", cl.ServerBaseURL)
}
req, err := http.NewRequest("GET", cl.ServerBaseURL+"/login", nil)
if err != nil {
return "", err
}
mID, err := keypair.EncodeID()
if err != nil {
return "", err
}
req.Header.Add("X-Minilock-Id", mID)
resp, err := cl.Client.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
encAuthToken, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
_, _, contents, err := minilock.DecryptFileContents(encAuthToken, keypair)
if err != nil {
return "", err
}
return string(contents), nil
}
//
// Helpers
//
func ToConfigs(shares []*Share) ([]*backend.Config, error) {
configs := make([]*backend.Config, 0, len(shares))
var errs []string
for _, share := range shares {
cfg, err := ToConfig(share)
if err != nil {
errs = append(errs, err.Error())
continue
}
configs = append(configs, cfg)
}
var err error
if len(errs) != 0 {
err = fmt.Errorf("share: %d error(s) converting shares to configs: %s",
len(errs), strings.Join(errs, "; "))
}
return configs, err
}
func toConfigs(shares []*Share, err error) ([]*backend.Config, error) {
if err != nil {
return nil, err
}
return ToConfigs(shares)
}
func ToConfig(share *Share) (*backend.Config, error) {
cfg := &backend.Config{}
err := json.Unmarshal(share.Contents, cfg)
if err != nil {
return nil, err
}
return cfg, nil
}