/
request.go
443 lines (378 loc) · 9.62 KB
/
request.go
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package sdk
import (
"bufio"
"bytes"
"crypto/tls"
"encoding/base64"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"path"
"strings"
"github.com/spf13/viper"
)
var (
verbose bool
// Host defines the endpoint for all SDK requests
Host string
user string
password string
token string
hash string
skipReadConfig bool
retry int
// AuthHeader is used as HTTP header
AuthHeader = "X_AUTH_HEADER"
// RequestedWithHeader is used as HTTP header
RequestedWithHeader = "X-Requested-With"
// RequestedWithValue is used as HTTP header
RequestedWithValue = "X-CDS-SDK"
//SessionTokenHeader is user as HTTP header
SessionTokenHeader = "Session-Token"
// HTTP client
client HTTPClient
// current agent calling
agent Agent
// CDSConfigFile is path to the default config file
CDSConfigFile = path.Join(os.Getenv("HOME"), ".cds", "config.json")
)
// InitEndpoint force sdk package request to given endpoint
func InitEndpoint(en string) {
Host = en
}
// Authorization set authorization header for all next call
func Authorization(h string) {
hash = h
}
// Agent describe the type of authentication method to use
type Agent string
// Different values of agent
const (
SDKAgent Agent = "CDS/sdk"
WorkerAgent = "CDS/worker"
HatcheryAgent = "CDS/hatchery"
)
//SetAgent set a agent value
func SetAgent(a Agent) {
agent = a
}
//SetRetry initialize number of http retry
func SetRetry(n int) {
retry = n
}
// If CDS_SKIP_VERIFY is present, use a specific http client
// with TLS InsecureSkipVerify enabled
func init() {
agent = SDKAgent
retry = 10
skip := os.Getenv("CDS_SKIP_VERIFY")
if skip != "" {
tr := &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
client = &http.Client{Transport: tr}
return
}
client = http.DefaultClient
}
func initRequest(req *http.Request) {
req.Header.Set("Content-Type", "application/json")
req.Header.Set("User-Agent", string(agent))
req.Header.Set("Connection", "close")
req.Header.Add(RequestedWithHeader, RequestedWithValue)
}
//ReadConfig read the specified config file
func ReadConfig() error {
if skipReadConfig {
return nil
}
skipReadConfig = true
viper.SetConfigFile(CDSConfigFile)
errReadConfigFile := viper.ReadInConfig()
if errReadConfigFile == nil {
if viper.GetString("host") != "" {
Host = viper.GetString("host")
}
if viper.GetString("user") != "" {
user = viper.GetString("user")
}
if viper.GetString("password") != "" {
password = viper.GetString("password")
}
if viper.GetString("token") != "" {
token = viper.GetString("token")
}
}
if val := os.Getenv("CDS_VERBOSE"); val == "true" {
verbose = true
}
if val := os.Getenv("CDS_USER"); val != "" {
user = val
}
if val := os.Getenv("CDS_PASSWORD"); val != "" {
password = val
}
if val := os.Getenv("CDS_TOKEN"); val != "" {
token = val
}
if user != "" && (password != "" || token != "") {
return nil
}
if hash != "" {
return nil
}
if errReadConfigFile != nil {
fmt.Printf("Warning: Invalid configuration file (%s)\n", errReadConfigFile)
}
return nil
}
// RequestModifier is used to modify behavior of Request and Steam functions
type RequestModifier func(req *http.Request)
// HTTPClient is a interface for HTTPClient mock
type HTTPClient interface {
Do(*http.Request) (*http.Response, error)
}
//SetHTTPClient aims to change the default http client of the sdk
func SetHTTPClient(c HTTPClient) {
client = c
}
//Options set authentication data
func Options(h, u, p, t string) {
Host = h
user = u
password = p
token = t
skipReadConfig = true
}
// SetHeader modify headers of http.Request
func SetHeader(key, value string) RequestModifier {
return func(req *http.Request) {
req.Header.Set(key, value)
}
}
// Request executes an authentificated HTTP request on $path given $method and $args
func Request(method string, path string, args []byte, mods ...RequestModifier) ([]byte, int, error) {
respBody, code, err := Stream(method, path, args, mods...)
if err != nil {
return nil, 0, err
}
defer func() {
// Drain and close the body to let the Transport reuse the connection
io.Copy(ioutil.Discard, respBody)
respBody.Close()
}()
var body []byte
body, err = ioutil.ReadAll(respBody)
if err != nil {
return nil, code, err
}
if verbose {
if len(body) > 0 {
log.Printf("Response Body: %s\n", body)
}
}
if err := DecodeError(body); err != nil {
return nil, code, err
}
return body, code, nil
}
// Stream makes an authenticated http request and return io.ReadCloser
func Stream(method string, path string, args []byte, mods ...RequestModifier) (io.ReadCloser, int, error) {
var savederror error
err := ReadConfig()
if err != nil {
fmt.Fprintf(os.Stderr, "Error reading configuration: %s\n", err)
os.Exit(1)
}
if verbose {
log.Printf("Call %s %s%s\n", method, Host, path)
}
for i := 0; i < retry; i++ {
var req *http.Request
if args != nil {
req, err = http.NewRequest(method, Host+path, bytes.NewReader(args))
} else {
req, err = http.NewRequest(method, Host+path, nil)
}
if err != nil {
savederror = err
continue
}
initRequest(req)
for i := range mods {
mods[i](req)
}
//No auth on /login route
if !strings.HasPrefix(path, "/login") {
if hash != "" {
basedHash := base64.StdEncoding.EncodeToString([]byte(hash))
req.Header.Set(AuthHeader, basedHash)
}
if user != "" && password != "" {
req.SetBasicAuth(user, password)
}
if user != "" && token != "" {
req.Header.Add(SessionTokenHeader, token)
req.SetBasicAuth(user, token)
}
}
resp, err := client.Do(req)
// if everything is fine, return body
if err == nil && resp.StatusCode < 500 {
return resp.Body, resp.StatusCode, nil
}
// if no request error by status > 500, check CDS error
// if there is a CDS errors, return it
if err == nil && resp.StatusCode == 500 {
var body []byte
body, err = ioutil.ReadAll(resp.Body)
if err != nil {
resp.Body.Close()
continue
}
cdserr := DecodeError(body)
if cdserr != nil {
resp.Body.Close()
return nil, resp.StatusCode, cdserr
}
}
if resp != nil && resp.StatusCode >= 500 {
savederror = fmt.Errorf("HTTP %d", resp.StatusCode)
if resp != nil && resp.Body != nil {
resp.Body.Close()
}
continue
}
if err != nil && (strings.Contains(err.Error(), "connection reset by peer") ||
strings.Contains(err.Error(), "unexpected EOF")) {
savederror = err
if resp != nil && resp.Body != nil {
resp.Body.Close()
}
continue
}
if err != nil {
return nil, 0, err
}
}
return nil, 0, fmt.Errorf("x%d: %s", retry, savederror)
}
// UploadMultiPart upload multipart
func UploadMultiPart(method string, path string, body *bytes.Buffer, mods ...RequestModifier) ([]byte, int, error) {
if verbose {
log.Printf("Starting UploadMultiPart %s %s", method, path)
}
if err := ReadConfig(); err != nil {
fmt.Fprintf(os.Stderr, "Error reading configuration: %s\n", err)
os.Exit(1)
}
var req *http.Request
req, errRequest := http.NewRequest(method, Host+path, body)
if errRequest != nil {
return nil, 0, errRequest
}
initRequest(req)
for i := range mods {
mods[i](req)
}
if hash != "" {
basedHash := base64.StdEncoding.EncodeToString([]byte(hash))
req.Header.Set(AuthHeader, basedHash)
}
if user != "" && password != "" {
req.SetBasicAuth(user, password)
}
if user != "" && token != "" {
req.Header.Add(SessionTokenHeader, token)
req.SetBasicAuth(user, token)
}
resp, err := client.Do(req)
if err != nil {
return nil, 0, err
}
defer resp.Body.Close()
if verbose {
log.Printf("Response Status: %s\n", resp.Status)
log.Printf("Request path: %s\n", Host+path)
log.Printf("Request Headers: %s\n", req.Header)
log.Printf("Response Headers: %s\n", resp.Header)
}
var respBody []byte
respBody, err = ioutil.ReadAll(resp.Body)
if err != nil {
return nil, resp.StatusCode, err
}
if verbose {
if len(body.Bytes()) > 0 {
log.Printf("Response Body: %s\n", body.String())
}
}
return respBody, resp.StatusCode, nil
}
// Upload upload content in given io.Reader to given HTTP endpoint
func Upload(method string, path string, body io.ReadCloser, mods ...RequestModifier) ([]byte, int, error) {
err := ReadConfig()
if err != nil {
fmt.Fprintf(os.Stderr, "Error reading configuration: %s\n", err)
os.Exit(1)
}
var req *http.Request
req, _ = http.NewRequest(method, Host+path, body)
if err != nil {
return nil, 0, err
}
initRequest(req)
for i := range mods {
mods[i](req)
}
if hash != "" {
basedHash := base64.StdEncoding.EncodeToString([]byte(hash))
req.Header.Set(AuthHeader, basedHash)
}
if user != "" && password != "" {
req.SetBasicAuth(user, password)
}
resp, err := client.Do(req)
if err != nil {
return nil, 0, err
}
defer resp.Body.Close()
if verbose {
log.Printf("Response Status: %s\n", resp.Status)
log.Printf("Request path: %s\n", Host+path)
log.Printf("Request Headers: %s\n", req.Header)
log.Printf("Response Headers: %s\n", resp.Header)
}
var respBody []byte
respBody, err = ioutil.ReadAll(resp.Body)
if err != nil {
return nil, resp.StatusCode, err
}
if verbose {
if len(respBody) > 0 {
log.Printf("Response Body: %s\n", respBody)
}
}
return respBody, resp.StatusCode, nil
}
// DisplayStream decode each line from http buffer and print either message or error
func DisplayStream(buffer io.ReadCloser) error {
reader := bufio.NewReader(buffer)
for {
line, err := reader.ReadBytes('\n')
e := DecodeError(line)
if e != nil {
return e
}
if err != nil && err == io.EOF {
return nil
}
if err != nil {
return err
}
fmt.Fprintf(os.Stderr, "%s", line)
}
}