forked from edgexfoundry/app-functions-sdk-go
/
http.go
265 lines (228 loc) · 7.9 KB
/
http.go
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//
// Copyright (c) 2019 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package transforms
import (
"bytes"
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"io/ioutil"
"log"
"net/http"
"github.com/student3671/app-functions-sdk-go/pkg/util"
"github.com/edgexfoundry/go-mod-core-contracts/clients"
"github.com/student3671/app-functions-sdk-go/appcontext"
)
// HTTPSender ...
type HTTPSender struct {
URL string
MimeType string
PersistOnError bool
SecretHeaderName string
SecretPath string
certFile string
keyFile string
caFile string
}
// NewHTTPSender creates, initializes and returns a new instance of HTTPSender
func NewHTTPSender(url string, mimeType string, persistOnError bool) HTTPSender {
return HTTPSender{
URL: url,
MimeType: mimeType,
PersistOnError: persistOnError,
}
}
func NewHTTPSenderWithSecretHeader(url string, mimeType string, persistOnError bool, httpHeaderSecretName string, secretPath string) HTTPSender {
return HTTPSender{
URL: url,
MimeType: mimeType,
PersistOnError: persistOnError,
SecretHeaderName: httpHeaderSecretName,
SecretPath: secretPath,
}
}
// NewHTTPSender creates, initializes and returns a new instance of HTTPSender
func NewHTTPSSender(url string, mimeType string, persistOnError bool, certfile string, keyfile string, cafile string) HTTPSender {
return HTTPSender{
URL: url,
MimeType: mimeType,
PersistOnError: persistOnError,
certFile: certfile,
keyFile: keyfile,
caFile: cafile,
}
}
// HTTPPost will send data from the previous function to the specified Endpoint via http POST.
// If no previous function exists, then the event that triggered the pipeline will be used.
// An empty string for the mimetype will default to application/json.
func (sender HTTPSender) HTTPPost(edgexcontext *appcontext.Context, params ...interface{}) (bool, interface{}) {
if len(params) < 1 {
// We didn't receive a result
return false, errors.New("No Data Received")
}
if sender.MimeType == "" {
sender.MimeType = "application/json"
}
exportData, err := util.CoerceType(params[0])
if err != nil {
return false, err
}
usingSecrets, err := sender.determineIfUsingSecrets()
if err != nil {
return false, err
}
client := &http.Client{}
req, err := http.NewRequest(http.MethodPost, sender.URL, bytes.NewReader(exportData))
if err != nil {
return false, err
}
var theSecrets map[string]string
if usingSecrets {
theSecrets, err = edgexcontext.GetSecrets(sender.SecretPath, sender.SecretHeaderName)
if err != nil {
return false, err
}
req.Header.Set(sender.SecretHeaderName, theSecrets[sender.SecretHeaderName])
}
req.Header.Set("Content-Type", sender.MimeType)
edgexcontext.LoggingClient.Debug("POSTing data")
response, err := client.Do(req)
if err != nil {
sender.setRetryData(edgexcontext, exportData)
return false, err
}
defer response.Body.Close()
edgexcontext.LoggingClient.Debug(fmt.Sprintf("Response: %s", response.Status))
edgexcontext.LoggingClient.Debug(fmt.Sprintf("Sent data: %s", string(exportData)))
bodyBytes, errReadingBody := ioutil.ReadAll(response.Body)
if errReadingBody != nil {
sender.setRetryData(edgexcontext, exportData)
return false, errReadingBody
}
edgexcontext.LoggingClient.Trace("Data exported", "Transport", "HTTP", clients.CorrelationHeader, edgexcontext.CorrelationID)
// continues the pipeline if we get a 2xx response, stops pipeline if non-2xx response
if response.StatusCode < 200 || response.StatusCode >= 300 {
sender.setRetryData(edgexcontext, exportData)
return false, fmt.Errorf("export failed with %d HTTP status code", response.StatusCode)
}
return true, bodyBytes
}
func (sender HTTPSender) determineIfUsingSecrets() (bool, error) {
//check if one field but not others are provided for secrets
if sender.SecretPath != "" && sender.SecretHeaderName == "" {
return false, errors.New("SecretPath was specified but no header name was provided")
}
if sender.SecretHeaderName != "" && sender.SecretPath == "" {
return false, errors.New("HTTP Header Secret Name was provided but no SecretPath was provided")
}
// not using secrets if both are blank
if sender.SecretHeaderName == "" && sender.SecretPath == "" {
return false, nil
}
// using secrets, all required fields are provided
return true, nil
}
func (sender HTTPSender) setRetryData(ctx *appcontext.Context, exportData []byte) {
if sender.PersistOnError {
ctx.RetryData = exportData
}
}
// HTTPPost will send data from the previous function to the specified Endpoint via http POST.
// If no previous function exists, then the event that triggered the pipeline will be used.
// An empty string for the mimetype will default to application/json.
func (sender HTTPSender) HTTPSPost(edgexcontext *appcontext.Context, params ...interface{}) (bool, interface{}) {
if len(params) < 1 {
// We didn't receive a result
return false, errors.New("No Data Received")
}
if sender.MimeType == "" {
sender.MimeType = "application/json"
}
exportData, err := util.CoerceType(params[0])
if err != nil {
return false, err
}
usingSecrets, err := sender.determineIfUsingSecrets()
if err != nil {
return false, err
}
// Load client cert
cert, err := tls.LoadX509KeyPair(sender.certFile, sender.keyFile)
if err != nil {
log.Fatal(err)
}
// Load CA cert
caCert, err := ioutil.ReadFile(sender.caFile)
if err != nil {
log.Fatal(err)
}
caCertPool := x509.NewCertPool()
caCertPool.AppendCertsFromPEM(caCert)
// Setup HTTPS client
tlsConfig := &tls.Config{
Certificates: []tls.Certificate{cert},
RootCAs: caCertPool,
}
tlsConfig.BuildNameToCertificate()
transport := &http.Transport{TLSClientConfig: tlsConfig}
client := &http.Client{Transport: transport}
// Do GET something
resp, err := client.Get("https://localhost:8443")
if err != nil {
log.Fatal(err)
}
defer resp.Body.Close()
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Fatal(err)
}
log.Println(string(data))
req, err := http.NewRequest(http.MethodPost, sender.URL, bytes.NewReader(exportData))
if err != nil {
return false, err
}
var theSecrets map[string]string
if usingSecrets {
theSecrets, err = edgexcontext.GetSecrets(sender.SecretPath, sender.SecretHeaderName)
if err != nil {
return false, err
}
req.Header.Set(sender.SecretHeaderName, theSecrets[sender.SecretHeaderName])
}
req.Header.Set("Content-Type", sender.MimeType)
edgexcontext.LoggingClient.Debug("POSTing data")
response, err := client.Do(req)
if err != nil {
sender.setRetryData(edgexcontext, exportData)
return false, err
}
defer response.Body.Close()
edgexcontext.LoggingClient.Debug(fmt.Sprintf("Response: %s", response.Status))
edgexcontext.LoggingClient.Debug(fmt.Sprintf("Sent data: %s", string(exportData)))
bodyBytes, errReadingBody := ioutil.ReadAll(response.Body)
if errReadingBody != nil {
sender.setRetryData(edgexcontext, exportData)
return false, errReadingBody
}
edgexcontext.LoggingClient.Trace("Data exported", "Transport", "HTTP", clients.CorrelationHeader, edgexcontext.CorrelationID)
// continues the pipeline if we get a 2xx response, stops pipeline if non-2xx response
if response.StatusCode < 200 || response.StatusCode >= 300 {
sender.setRetryData(edgexcontext, exportData)
return false, fmt.Errorf("export failed with %d HTTP status code", response.StatusCode)
}
return true, bodyBytes
}