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/*
Package firego is a REST client for Firebase (https://firebase.com).
*/
package firego
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net"
"net/http"
_url "net/url"
"strings"
"sync"
"time"
)
// TimeoutDuration is the length of time any request will have to establish
// a connection and receive headers from Firebase before returning
// an ErrTimeout error.
var TimeoutDuration = 30 * time.Second
var defaultRedirectLimit = 30
// ErrTimeout is an error type is that is returned if a request
// exceeds the TimeoutDuration configured.
type ErrTimeout struct {
error
}
// query parameter constants
const (
authParam = "auth"
shallowParam = "shallow"
formatParam = "format"
formatVal = "export"
orderByParam = "orderBy"
limitToFirstParam = "limitToFirst"
limitToLastParam = "limitToLast"
startAtParam = "startAt"
endAtParam = "endAt"
equalToParam = "equalTo"
)
const defaultHeartbeat = 2 * time.Minute
// Firebase represents a location in the cloud.
type Firebase struct {
url string
client *http.Client
clientTimeout time.Duration
paramsMtx sync.RWMutex
params _url.Values
eventMtx sync.Mutex
eventFuncs map[string]chan struct{}
watchMtx sync.Mutex
watching bool
watchHeartbeat time.Duration
stopWatching chan struct{}
}
// New creates a new Firebase reference,
// if client is nil, http.DefaultClient is used.
func New(url string, client *http.Client) *Firebase {
fb := &Firebase{
url: sanitizeURL(url),
params: _url.Values{},
clientTimeout: TimeoutDuration,
stopWatching: make(chan struct{}),
watchHeartbeat: defaultHeartbeat,
eventFuncs: map[string]chan struct{}{},
}
if client == nil {
var tr *http.Transport
tr = &http.Transport{
Dial: func(network, address string) (net.Conn, error) {
start := time.Now()
c, err := net.DialTimeout(network, address, fb.clientTimeout)
tr.ResponseHeaderTimeout = fb.clientTimeout - time.Since(start)
return c, err
},
}
client = &http.Client{
Transport: tr,
CheckRedirect: redirectPreserveHeaders,
}
}
fb.client = client
return fb
}
// Auth sets the custom Firebase token used to authenticate to Firebase.
func (fb *Firebase) Auth(token string) {
fb.paramsMtx.Lock()
fb.params.Set(authParam, token)
fb.paramsMtx.Unlock()
}
// Unauth removes the current token being used to authenticate to Firebase.
func (fb *Firebase) Unauth() {
fb.paramsMtx.Lock()
fb.params.Del(authParam)
fb.paramsMtx.Unlock()
}
// Ref returns a copy of an existing Firebase reference with a new path.
func (fb *Firebase) Ref(path string) (*Firebase, error) {
newFB := fb.copy()
parsedURL, err := _url.Parse(fb.url)
if err != nil {
return newFB, err
}
newFB.url = parsedURL.Scheme + "://" + parsedURL.Host + "/" + strings.Trim(path, "/")
return newFB, nil
}
// SetURL changes the url for a firebase reference.
func (fb *Firebase) SetURL(url string) {
fb.url = sanitizeURL(url)
}
// URL returns firebase reference URL
func (fb *Firebase) URL() string {
return fb.url
}
// Push creates a reference to an auto-generated child location.
func (fb *Firebase) Push(v interface{}) (*Firebase, error) {
bytes, err := json.Marshal(v)
if err != nil {
return nil, err
}
_, bytes, err = fb.doRequest("POST", bytes)
if err != nil {
return nil, err
}
var m map[string]string
if err := json.Unmarshal(bytes, &m); err != nil {
return nil, err
}
newRef := fb.copy()
newRef.url = fb.url + "/" + m["name"]
return newRef, err
}
// Remove the Firebase reference from the cloud.
func (fb *Firebase) Remove() error {
_, _, err := fb.doRequest("DELETE", nil)
if err != nil {
return err
}
return nil
}
// Set the value of the Firebase reference.
func (fb *Firebase) Set(v interface{}) error {
bytes, err := json.Marshal(v)
if err != nil {
return err
}
_, _, err = fb.doRequest("PUT", bytes)
return err
}
// Update the specific child with the given value.
func (fb *Firebase) Update(v interface{}) error {
bytes, err := json.Marshal(v)
if err != nil {
return err
}
_, _, err = fb.doRequest("PATCH", bytes)
return err
}
// Value gets the value of the Firebase reference.
func (fb *Firebase) Value(v interface{}) error {
_, bytes, err := fb.doRequest("GET", nil)
if err != nil {
return err
}
return json.Unmarshal(bytes, v)
}
// String returns the string representation of the
// Firebase reference.
func (fb *Firebase) String() string {
path := fb.url + "/.json"
fb.paramsMtx.RLock()
if len(fb.params) > 0 {
path += "?" + fb.params.Encode()
}
fb.paramsMtx.RUnlock()
return path
}
// Child creates a new Firebase reference for the requested
// child with the same configuration as the parent.
func (fb *Firebase) Child(child string) *Firebase {
c := fb.copy()
c.url = c.url + "/" + child
return c
}
func (fb *Firebase) copy() *Firebase {
c := &Firebase{
url: fb.url,
params: _url.Values{},
client: fb.client,
clientTimeout: fb.clientTimeout,
stopWatching: make(chan struct{}),
watchHeartbeat: defaultHeartbeat,
eventFuncs: map[string]chan struct{}{},
}
// making sure to manually copy the map items into a new
// map to avoid modifying the map reference.
fb.paramsMtx.RLock()
for k, v := range fb.params {
c.params[k] = v
}
fb.paramsMtx.RUnlock()
return c
}
func sanitizeURL(url string) string {
if !strings.HasPrefix(url, "https://") && !strings.HasPrefix(url, "http://") {
url = "https://" + url
}
if strings.HasSuffix(url, "/") {
url = url[:len(url)-1]
}
return url
}
// Preserve headers on redirect.
//
// Reference https://github.com/golang/go/issues/4800
func redirectPreserveHeaders(req *http.Request, via []*http.Request) error {
if len(via) == 0 {
// No redirects
return nil
}
if len(via) > defaultRedirectLimit {
return fmt.Errorf("%d consecutive requests(redirects)", len(via))
}
// mutate the subsequent redirect requests with the first Header
for key, val := range via[0].Header {
req.Header[key] = val
}
return nil
}
func withHeader(key, value string) func(*http.Request) {
return func(req *http.Request) {
req.Header.Add(key, value)
}
}
func (fb *Firebase) doRequest(method string, body []byte, options ...func(*http.Request)) (http.Header, []byte, error) {
req, err := http.NewRequest(method, fb.String(), bytes.NewReader(body))
if err != nil {
return nil, nil, err
}
for _, opt := range options {
opt(req)
}
resp, err := fb.client.Do(req)
switch err := err.(type) {
default:
return nil, nil, err
case nil:
// carry on
case *_url.Error:
// `http.Client.Do` will return a `url.Error` that wraps a `net.Error`
// when exceeding it's `Transport`'s `ResponseHeadersTimeout`
e1, ok := err.Err.(net.Error)
if ok && e1.Timeout() {
return nil, nil, ErrTimeout{err}
}
return nil, nil, err
case net.Error:
// `http.Client.Do` will return a `net.Error` directly when Dial times
// out, or when the Client's RoundTripper otherwise returns an err
if err.Timeout() {
return nil, nil, ErrTimeout{err}
}
return nil, nil, err
}
defer resp.Body.Close()
respBody, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, nil, err
}
if resp.StatusCode/200 != 1 {
return resp.Header, respBody, errors.New(string(respBody))
}
return resp.Header, respBody, nil
}