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/*
* bridge.go
* GoHue library for Philips Hue
* Copyright (C) 2016 Collin Guarino (Collinux) collin.guarino@gmail.com
* License: GPL version 2 or higher http://www.gnu.org/licenses/gpl.html
*/
package hue
import (
"log"
"encoding/xml"
"encoding/json"
"net/http"
"io/ioutil"
"runtime"
"fmt"
"strings"
"bytes"
"io"
"errors"
)
// Bridge struct defines hardware that is used to communicate with the lights.
type Bridge struct {
IPAddress string
Username string
Info BridgeInfo
}
// BridgeInfo struct is the outermost (root) structure
// for parsing xml from a bridge.
type BridgeInfo struct {
XMLName xml.Name `xml:"root"`
Device Device `xml:"device"`
}
// Device struct is the innermost (base) structure
// for parsing device info xml from a bridge.
type Device struct {
XMLName xml.Name `xml:"device"`
DeviceType string `xml:"deviceType"`
FriendlyName string `xml:"friendlyName"`
Manufacturer string `xml:"manufacturer"`
ManufacturerURL string `xml:"manufacturerURL"`
ModelDescription string `xml:"modelDescription"`
ModelName string `xml:"modelName"`
ModelNumber string `xml:"modelNumber"`
ModelURL string `xml:"modelURL"`
SerialNumber string `xml:"serialNumber"`
UDN string `xml:"UDN"`
}
// bridge.Get will send an http GET to the bridge
func (self *Bridge) Get(path string) ([]byte, io.Reader, error) {
resp, err := http.Get("http://" + self.IPAddress + path)
if self.Error(resp, err) {
return []byte{}, nil, err
}
return handleResponse(resp)
}
// bridge.Post will send an http POST to the bridge with
// a body formatted with parameters (in a generic interface)
func (self *Bridge) Post(path string, params interface{}) ([]byte, io.Reader, error) {
// Add the params to the request
request, err := json.Marshal(params)
if err != nil {
trace("", err)
return []byte{}, nil, nil
}
log.Println("\nSending POST body: ", string(request))
// Send the request and handle the response
uri := fmt.Sprintf("http://" + self.IPAddress + path)
resp, err := http.Post(uri, "text/json", bytes.NewReader(request))
if self.Error(resp, err) {
return []byte{}, nil, nil
}
return handleResponse(resp)
}
// Bridge.Put will send an http PUT to the bridge with
// a body formatted with parameters (in a generic interface)
func (self *Bridge) Put(path string, params interface{}) ([]byte, io.Reader, error) {
uri := fmt.Sprintf("http://" + self.IPAddress + path)
client := &http.Client{}
data, err := json.Marshal(params)
if err != nil {
return []byte{}, nil, err
}
//fmt.Println("\n\nPARAMS: ", params)
log.Println("\nSending PUT body: ", string(data))
request, err := http.NewRequest("PUT", uri, bytes.NewReader(data))
resp, err := client.Do(request)
if err != nil {
return []byte{}, nil, err
}
return handleResponse(resp)
}
// Bridge.Delete will send an http DELETE to the bridge
func (self *Bridge) Delete(path string) error {
uri := fmt.Sprintf("http://" + self.IPAddress + path)
client := &http.Client{}
req, err := http.NewRequest("DELETE", uri, nil)
resp, err := client.Do(req)
if err != nil {
return err
}
_, _, err := handleResponse(resp)
if err != nil {
return err
}
return nil
}
// HandleResponse manages the http.Response content from a
// bridge Get/Put/Post/Delete by checking it for errors
// and invalid return types.
func handleResponse(resp *http.Response) ([]byte, io.Reader, error) {
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
trace("Error parsing bridge description xml.", nil)
return []byte{}, nil, err
}
reader := bytes.NewReader(body)
log.Println("Handled response:\n--------------------\n", string(body) +
"\n--------------------\n")
return body, reader, nil
}
// bridge.Error handles all bridge response status errors
func (self *Bridge) Error(resp *http.Response, err error) (bool) {
if err != nil {
trace("", err)
return true
} else if resp.StatusCode != 200 {
// TODO: handle other status codes
log.Println(fmt.Sprintf("Bridge status error: %d", resp.StatusCode))
return true
}
return false
}
// NewBridge defines hardware that is compatible with Hue.
func NewBridge(ip string, username string) *Bridge {
bridge := Bridge {
IPAddress: ip,
Username: username,
}
GetBridgeInfo(&bridge)
return &bridge
}
// GetBridgeInfo retreives the description.xml file from the bridge.
func GetBridgeInfo(self *Bridge) error {
_, reader, err := self.Get("/description.xml")
if err != nil {
return err
}
data := BridgeInfo{}
err = xml.NewDecoder(reader).Decode(&data)
if err != nil {
return err
}
self.Info = data
return nil
}
// CreateUser posts to ./api on the bridge to create a new whitelisted user.
func CreateUser(bridge *Bridge, deviceType string) (string, error) {
// Send an HTTP POST with the body content
params := map[string]string{"devicetype": deviceType}
body, _, err := bridge.Post("/api", params)
if err != nil {
return "", err
}
// Parse the result and return it
result := string(body)
errFound := strings.Contains(result, "error")
noLink := strings.Contains(result, "link button not pressed")
if errFound && noLink {
return "", errors.New("Bridge link button not pressed.")
}
return "", nil
}
// Log the date, time, file location, line number, and function.
// Message can be "" or Err can be nil (not both)
func trace(message string, err error) {
pc := make([]uintptr, 10)
runtime.Callers(2, pc)
f := runtime.FuncForPC(pc[0])
file, line := f.FileLine(pc[0])
if err != nil {
log.Printf("%s:%d %s: %s\n", file, line, f.Name(), err)
} else {
log.Printf("%s:%d %s: %s\n", file, line, f.Name(), message)
}
}
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