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http-env.go
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http-env.go
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// Copyright 2020 Blues Inc. All rights reserved.
// Use of this source code is governed by licenses granted by the
// copyright holder including that found in the LICENSE file.
package main
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"time"
)
// Proxy handler so that we may make external references from local pages without CORS issues. Note that
// this ONLY is supported for JSON queries.
func inboundWebEnvHandler(httpRsp http.ResponseWriter, httpReq *http.Request) {
// Get the required args
_, args := HTTPArgs(httpReq, "")
product := args["product"]
if product == "" {
fmt.Fprintf(httpRsp, "product not specified")
return
}
device := args["device"]
if device == "" {
fmt.Fprintf(httpRsp, "device not specified")
return
}
switch httpReq.Method {
case "GET":
envJSON, statusCode, err := envGet(httpReq, product, device)
if err != nil {
fmt.Fprintf(httpRsp, "%s", err)
return
}
httpRsp.WriteHeader(statusCode)
httpRsp.Write(envJSON)
return
case "POST":
envJSON, err := ioutil.ReadAll(httpReq.Body)
if err != nil {
fmt.Fprintf(httpRsp, "%s", err)
return
}
statusCode, err := envSet(httpReq, product, device, envJSON)
if err != nil {
fmt.Fprintf(httpRsp, "%s", err)
return
}
httpRsp.WriteHeader(statusCode)
return
}
fmt.Fprintf(httpRsp, "only GET and POST methods are supported")
}
// Call the notehub to get env vars
func envGet(httpReq *http.Request, product string, device string) (rsp []byte, statusCode int, err error) {
// Formulate the request
req := map[string]interface{}{}
req["product"] = product
req["device"] = device
req["req"] = "hub.env.get"
req["scope"] = "device"
// Marshal the request
reqJSON, err := json.Marshal(req)
if err != nil {
return
}
// Create the new HTTP request
var httpreq *http.Request
httpreq, err = http.NewRequest("POST", notehubURL, bytes.NewBuffer(reqJSON))
if err != nil {
err = fmt.Errorf("nr err: %s", err)
return
}
// Perform the HTTP I/O
httpclient := &http.Client{Timeout: time.Second * 15}
httpresp, err := httpclient.Do(httpreq)
if err != nil {
err = fmt.Errorf("do err: %s", err)
return
}
statusCode = httpresp.StatusCode
// Read the response
rsp, err = ioutil.ReadAll(httpresp.Body)
// Done
return
}
// Call the notehub to set env vars
func envSet(httpReq *http.Request, product string, device string, reqJSON []byte) (statusCode int, err error) {
// Unmarshal the request
req := map[string]interface{}{}
err = json.Unmarshal(reqJSON, &req)
if err != nil {
return
}
// Re-formulate it with constraints
delete(req, "app")
req["product"] = product
req["device"] = device
req["req"] = "hub.env.set"
req["scope"] = "device"
// Marshal the request
reqJSON, err = json.Marshal(req)
if err != nil {
return
}
// Create the new HTTP request
var httpreq *http.Request
httpreq, err = http.NewRequest("POST", notehubURL, bytes.NewBuffer(reqJSON))
if err != nil {
err = fmt.Errorf("nr err: %s", err)
return
}
// Perform the HTTP I/O
httpclient := &http.Client{Timeout: time.Second * 15}
httpresp, err := httpclient.Do(httpreq)
if err != nil {
err = fmt.Errorf("do err: %s", err)
return
}
statusCode = httpresp.StatusCode
// Done
return
}