/
req.go
773 lines (629 loc) · 21 KB
/
req.go
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// Package req simplify working with an HTTP requests
package req
// ////////////////////////////////////////////////////////////////////////////////// //
// //
// Copyright (c) 2024 ESSENTIAL KAOS //
// Apache License, Version 2.0 <https://www.apache.org/licenses/LICENSE-2.0> //
// //
// ////////////////////////////////////////////////////////////////////////////////// //
import (
"bytes"
"encoding/json"
"fmt"
"io"
"mime/multipart"
"net"
"net/http"
"net/url"
"os"
"path/filepath"
"runtime"
"strings"
"time"
)
// ////////////////////////////////////////////////////////////////////////////////// //
// Error types
const (
ERROR_BODY_ENCODE = 1
ERROR_CREATE_REQUEST = 2
ERROR_SEND_REQUEST = 3
)
// Request method
const (
POST = "POST"
GET = "GET"
PUT = "PUT"
HEAD = "HEAD"
DELETE = "DELETE"
PATCH = "PATCH"
)
// Content types
const (
CONTENT_TYPE_ATOM = "application/atom+xml"
CONTENT_TYPE_EDI = "application/EDI-X12"
CONTENT_TYPE_EDIFACT = "application/EDIFACT"
CONTENT_TYPE_JSON = "application/json"
CONTENT_TYPE_JAVASCRIPT = "application/javascript"
CONTENT_TYPE_OCTET_STREAM = "application/octet-stream"
CONTENT_TYPE_PDF = "application/pdf"
CONTENT_TYPE_POSTSCRIPT = "application/postscript"
CONTENT_TYPE_SOAP = "application/soap+xml"
CONTENT_TYPE_WOFF = "application/font-woff"
CONTENT_TYPE_XHTML = "application/xhtml+xml"
CONTENT_TYPE_DTD = "application/xml-dtd"
CONTENT_TYPE_XOP = "application/xop+xml"
CONTENT_TYPE_ZIP = "application/zip"
CONTENT_TYPE_GZIP = "application/gzip"
CONTENT_TYPE_BITTORRENT = "application/x-bittorrent"
CONTENT_TYPE_TEX = "application/x-tex"
CONTENT_TYPE_BASIC = "audio/basic"
CONTENT_TYPE_L24 = "audio/L24"
CONTENT_TYPE_MP4_AUDIO = "audio/mp4"
CONTENT_TYPE_AAC = "audio/aac"
CONTENT_TYPE_MPEG_AUDIO = "audio/mpeg"
CONTENT_TYPE_OGG_AUDIO = "audio/ogg"
CONTENT_TYPE_VORBIS = "audio/vorbis"
CONTENT_TYPE_WMA = "audio/x-ms-wma"
CONTENT_TYPE_WAX = "audio/x-ms-wax"
CONTENT_TYPE_REALAUDIO = "audio/vnd.rn-realaudio"
CONTENT_TYPE_WAV = "audio/vnd.wave"
CONTENT_TYPE_WEBM_AUDIO = "audio/webm"
CONTENT_TYPE_GIF = "image/gif"
CONTENT_TYPE_JPEG = "image/jpeg"
CONTENT_TYPE_PJPEG = "image/pjpeg"
CONTENT_TYPE_PNG = "image/png"
CONTENT_TYPE_SVG = "image/svg+xml"
CONTENT_TYPE_TIFF = "image/tiff"
CONTENT_TYPE_ICON = "image/vnd.microsoft.icon"
CONTENT_TYPE_WBMP = "image/vnd.wap.wbmp"
CONTENT_TYPE_HTTP = "message/http"
CONTENT_TYPE_IMDN = "message/imdn+xml"
CONTENT_TYPE_PARTIAL = "message/partial"
CONTENT_TYPE_RFC822 = "message/rfc822"
CONTENT_TYPE_EXAMPLE = "model/example"
CONTENT_TYPE_IGES = "model/iges"
CONTENT_TYPE_MESH = "model/mesh"
CONTENT_TYPE_VRML = "model/vrml"
CONTENT_TYPE_MIXED = "multipart/mixed"
CONTENT_TYPE_ALTERNATIVE = "multipart/alternative"
CONTENT_TYPE_RELATED = "multipart/related"
CONTENT_TYPE_FORM_DATA = "multipart/form-data"
CONTENT_TYPE_SIGNED = "multipart/signed"
CONTENT_TYPE_ENCRYPTED = "multipart/encrypted"
CONTENT_TYPE_CSS = "text/css"
CONTENT_TYPE_CSV = "text/csv"
CONTENT_TYPE_HTML = "text/html"
CONTENT_TYPE_PLAIN = "text/plain"
CONTENT_TYPE_PHP = "text/php"
CONTENT_TYPE_XML = "text/xml"
CONTENT_TYPE_MPEG_VIDEO = "video/mpeg"
CONTENT_TYPE_MP4_VIDEO = "video/mp4"
CONTENT_TYPE_OGG_VIDEO = "video/ogg"
CONTENT_TYPE_QUICKTIME = "video/quicktime"
CONTENT_TYPE_WEBM_VIDEO = "video/webm"
CONTENT_TYPE_WMV = "video/x-ms-wmv"
CONTENT_TYPE_FLV = "video/x-flv"
CONTENT_TYPE_3GPP = "video/3gpp"
CONTENT_TYPE_3GPP2 = "video/3gpp2"
)
// Status codes
const (
STATUS_CONTINUE = 100 // RFC 7231, 6.2.1
STATUS_SWITCHING_PROTOCOLS = 101 // RFC 7231, 6.2.2
STATUS_PROCESSING = 102 // RFC 2518, 10.1
STATUS_OK = 200 // RFC 7231, 6.3.1
STATUS_CREATED = 201 // RFC 7231, 6.3.2
STATUS_ACCEPTED = 202 // RFC 7231, 6.3.3
STATUS_NON_AUTHORITATIVE_INFO = 203 // RFC 7231, 6.3.4
STATUS_NO_CONTENT = 204 // RFC 7231, 6.3.5
STATUS_RESET_CONTENT = 205 // RFC 7231, 6.3.6
STATUS_PARTIAL_CONTENT = 206 // RFC 7233, 4.1
STATUS_MULTI_STATUS = 207 // RFC 4918, 11.1
STATUS_ALREADY_REPORTED = 208 // RFC 5842, 7.1
STATUS_IMUSED = 226 // RFC 3229, 10.4.1
STATUS_MULTIPLE_CHOICES = 300 // RFC 7231, 6.4.1
STATUS_MOVED_PERMANENTLY = 301 // RFC 7231, 6.4.2
STATUS_FOUND = 302 // RFC 7231, 6.4.3
STATUS_SEE_OTHER = 303 // RFC 7231, 6.4.4
STATUS_NOT_MODIFIED = 304 // RFC 7232, 4.1
STATUS_USE_PROXY = 305 // RFC 7231, 6.4.5
STATUS_TEMPORARY_REDIRECT = 307 // RFC 7231, 6.4.7
STATUS_PERMANENT_REDIRECT = 308 // RFC 7538, 3
STATUS_BAD_REQUEST = 400 // RFC 7231, 6.5.1
STATUS_UNAUTHORIZED = 401 // RFC 7235, 3.1
STATUS_PAYMENT_REQUIRED = 402 // RFC 7231, 6.5.2
STATUS_FORBIDDEN = 403 // RFC 7231, 6.5.3
STATUS_NOT_FOUND = 404 // RFC 7231, 6.5.4
STATUS_METHOD_NOT_ALLOWED = 405 // RFC 7231, 6.5.5
STATUS_NOT_ACCEPTABLE = 406 // RFC 7231, 6.5.6
STATUS_PROXY_AUTH_REQUIRED = 407 // RFC 7235, 3.2
STATUS_REQUEST_TIMEOUT = 408 // RFC 7231, 6.5.7
STATUS_CONFLICT = 409 // RFC 7231, 6.5.8
STATUS_GONE = 410 // RFC 7231, 6.5.9
STATUS_LENGTH_REQUIRED = 411 // RFC 7231, 6.5.10
STATUS_PRECONDITION_FAILED = 412 // RFC 7232, 4.2
STATUS_REQUEST_ENTITY_TOO_LARGE = 413 // RFC 7231, 6.5.11
STATUS_REQUEST_URITOO_LONG = 414 // RFC 7231, 6.5.12
STATUS_UNSUPPORTED_MEDIA_TYPE = 415 // RFC 7231, 6.5.13
STATUS_REQUESTED_RANGE_NOT_SATISFIABLE = 416 // RFC 7233, 4.4
STATUS_EXPECTATION_FAILED = 417 // RFC 7231, 6.5.14
STATUS_TEAPOT = 418 // RFC 7168, 2.3.3
STATUS_UNPROCESSABLE_ENTITY = 422 // RFC 4918, 11.2
STATUS_LOCKED = 423 // RFC 4918, 11.3
STATUS_FAILED_DEPENDENCY = 424 // RFC 4918, 11.4
STATUS_UPGRADE_REQUIRED = 426 // RFC 7231, 6.5.15
STATUS_PRECONDITION_REQUIRED = 428 // RFC 6585, 3
STATUS_TOO_MANY_REQUESTS = 429 // RFC 6585, 4
STATUS_REQUEST_HEADER_FIELDS_TOO_LARGE = 431 // RFC 6585, 5
STATUS_UNAVAILABLE_FOR_LEGAL_REASONS = 451 // RFC 7725, 3
STATUS_INTERNAL_SERVER_ERROR = 500 // RFC 7231, 6.6.1
STATUS_NOT_IMPLEMENTED = 501 // RFC 7231, 6.6.2
STATUS_BAD_GATEWAY = 502 // RFC 7231, 6.6.3
STATUS_SERVICE_UNAVAILABLE = 503 // RFC 7231, 6.6.4
STATUS_GATEWAY_TIMEOUT = 504 // RFC 7231, 6.6.5
STATUS_HTTPVERSION_NOT_SUPPORTED = 505 // RFC 7231, 6.6.6
STATUS_VARIANT_ALSO_NEGOTIATES = 506 // RFC 2295, 8.1
STATUS_INSUFFICIENT_STORAGE = 507 // RFC 4918, 11.5
STATUS_LOOP_DETECTED = 508 // RFC 5842, 7.2
STATUS_NOT_EXTENDED = 510 // RFC 2774, 7
STATUS_NETWORK_AUTHENTICATION_REQUIRED = 511 // RFC 6585, 6
)
// USER_AGENT is default user agent
const USER_AGENT = "go-ek-req"
// ////////////////////////////////////////////////////////////////////////////////// //
// Query is a map[string]any used for query
type Query map[string]any
// Headers is a map[string]string used for headers
type Headers map[string]string
// Request is basic struct
type Request struct {
Method string // Request method
URL string // Request URL
Query Query // Map with query params
Body any // Request body
Headers Headers // Map with headers
ContentType string // Content type header
Accept string // Accept header
BasicAuthUsername string // Basic auth username
BasicAuthPassword string // Basic auth password
BearerAuth string // Bearer auth token
AutoDiscard bool // Automatically discard all responses with status code != 200
FollowRedirect bool // Follow redirect
Close bool // Close indicates whether to close the connection after sending request
}
// Response is struct contains response data and properties
type Response struct {
*http.Response
URL string
}
// RequestError is error struct
type RequestError struct {
class int
desc string
}
// Engine is request engine
type Engine struct {
UserAgent string // UserAgent is default user-agent used for all requests
Dialer *net.Dialer // Dialer is default dialer struct
Transport *http.Transport // Transport is default transport struct
Client *http.Client // Client is default client struct
dialTimeout float64 // dialTimeout is dial timeout in seconds
requestTimeout float64 // requestTimeout is request timeout in seconds
initialized bool
}
// ////////////////////////////////////////////////////////////////////////////////// //
var (
// ErrNilEngine is returned if engine struct is nil
ErrNilEngine = RequestError{ERROR_CREATE_REQUEST, "Engine is nil"}
// ErrNilClient is returned if client struct is nil
ErrNilClient = RequestError{ERROR_CREATE_REQUEST, "Engine.Client is nil"}
// ErrNilTransport is returned if transport is nil
ErrNilTransport = RequestError{ERROR_CREATE_REQUEST, "Engine.Transport is nil"}
// ErrNilDialer is returned if dialer is nil
ErrNilDialer = RequestError{ERROR_CREATE_REQUEST, "Engine.Dialer is nil"}
// ErrNilResponse is returned if response is nil
ErrNilResponse = RequestError{ERROR_CREATE_REQUEST, "Response is nil"}
// ErrEmptyURL is returned if given URL is empty
ErrEmptyURL = RequestError{ERROR_CREATE_REQUEST, "URL property can't be empty and must be set"}
// ErrUnsupportedScheme is returned if given URL contains unsupported scheme
ErrUnsupportedScheme = RequestError{ERROR_CREATE_REQUEST, "Unsupported scheme in URL"}
)
// Global is global engine used by default for Request.Do, Request.Get, Request.Post,
// Request.Put, Request.Patch, Request.Head and Request.Delete methods
var Global = &Engine{
dialTimeout: 10.0,
}
// ////////////////////////////////////////////////////////////////////////////////// //
var ioCopyFunc = io.Copy
var useFakeFormGenerator = false
// ////////////////////////////////////////////////////////////////////////////////// //
// SetUserAgent sets user agent based on app name and version for global engine
func SetUserAgent(app, version string, subs ...string) {
Global.SetUserAgent(app, version, subs...)
}
// SetDialTimeout sets dial timeout for global engine
func SetDialTimeout(timeout float64) {
Global.SetDialTimeout(timeout)
}
// SetRequestTimeout sets request timeout for global engine
func SetRequestTimeout(timeout float64) {
Global.SetRequestTimeout(timeout)
}
// ////////////////////////////////////////////////////////////////////////////////// //
// Init initializes engine
func (e *Engine) Init() *Engine {
if e.initialized {
return e
}
if e.Dialer == nil {
e.Dialer = &net.Dialer{}
}
if e.Transport == nil {
e.Transport = &http.Transport{
DialContext: e.Dialer.DialContext,
Proxy: http.ProxyFromEnvironment,
}
} else {
e.Transport.DialContext = e.Dialer.DialContext
}
if e.Client == nil {
e.Client = &http.Client{
Transport: e.Transport,
}
}
if e.dialTimeout > 0 {
e.SetDialTimeout(e.dialTimeout)
}
if e.requestTimeout > 0 {
e.SetRequestTimeout(e.requestTimeout)
}
if e.UserAgent == "" {
e.SetUserAgent(USER_AGENT, "10")
}
e.dialTimeout = 0
e.requestTimeout = 0
e.initialized = true
return e
}
// Do sends request and process response
func (e *Engine) Do(r Request) (*Response, error) {
return e.doRequest(r, "")
}
// Get sends GET request and process response
func (e *Engine) Get(r Request) (*Response, error) {
return e.doRequest(r, GET)
}
// Post sends POST request and process response
func (e *Engine) Post(r Request) (*Response, error) {
return e.doRequest(r, POST)
}
// Put sends PUT request and process response
func (e *Engine) Put(r Request) (*Response, error) {
return e.doRequest(r, PUT)
}
// Head sends HEAD request and process response
func (e *Engine) Head(r Request) (*Response, error) {
return e.doRequest(r, HEAD)
}
// Patch sends PATCH request and process response
func (e *Engine) Patch(r Request) (*Response, error) {
return e.doRequest(r, PATCH)
}
// PostFile sends multipart POST request with file data
func (e *Engine) PostFile(r Request, file, fieldName string, extraFields map[string]string) (*Response, error) {
err := configureMultipartRequest(&r, file, fieldName, extraFields)
if err != nil {
return nil, err
}
return e.doRequest(r, POST)
}
// Delete sends DELETE request and process response
func (e *Engine) Delete(r Request) (*Response, error) {
return e.doRequest(r, DELETE)
}
// SetUserAgent sets user agent based on app name and version
func (e *Engine) SetUserAgent(app, version string, subs ...string) {
if e == nil {
return
}
e.UserAgent = fmt.Sprintf(
"%s/%s (go; %s; %s-%s)",
app, version, runtime.Version(),
runtime.GOARCH, runtime.GOOS,
)
if len(subs) != 0 {
e.UserAgent += " " + strings.Join(subs, " ")
}
}
// SetDialTimeout sets dial timeout
func (e *Engine) SetDialTimeout(timeout float64) {
if e == nil {
return
}
if timeout > 0 {
if e.Dialer == nil {
e.dialTimeout = timeout
} else {
e.Dialer.Timeout = time.Duration(timeout * float64(time.Second))
}
}
}
// SetRequestTimeout sets request timeout
func (e *Engine) SetRequestTimeout(timeout float64) {
if e == nil {
return
}
if timeout > 0 {
if e.Dialer == nil {
e.requestTimeout = timeout
} else {
e.Client.Timeout = time.Duration(timeout * float64(time.Second))
}
}
}
// ////////////////////////////////////////////////////////////////////////////////// //
// Do sends request and process response
func (r Request) Do() (*Response, error) {
return Global.doRequest(r, "")
}
// Get sends GET request and process response
func (r Request) Get() (*Response, error) {
return Global.Get(r)
}
// Post sends POST request and process response
func (r Request) Post() (*Response, error) {
return Global.Post(r)
}
// Put sends PUT request and process response
func (r Request) Put() (*Response, error) {
return Global.Put(r)
}
// Head sends HEAD request and process response
func (r Request) Head() (*Response, error) {
return Global.Head(r)
}
// Patch sends PATCH request and process response
func (r Request) Patch() (*Response, error) {
return Global.Patch(r)
}
// Delete sends DELETE request and process response
func (r Request) Delete() (*Response, error) {
return Global.Delete(r)
}
// PostFile sends multipart POST request with file data
func (r Request) PostFile(file, fieldName string, extraFields map[string]string) (*Response, error) {
return Global.PostFile(r, file, fieldName, extraFields)
}
// ////////////////////////////////////////////////////////////////////////////////// //
// Discard reads response body for closing connection
func (r *Response) Discard() {
if r == nil || r.Body == nil {
return
}
io.Copy(io.Discard, r.Body)
}
// JSON decodes json encoded body
func (r *Response) JSON(v any) error {
if r == nil || r.Body == nil {
return ErrNilResponse
}
defer r.Body.Close()
return json.NewDecoder(r.Body).Decode(v)
}
// Bytes reads response body as byte slice
func (r *Response) Bytes() []byte {
if r == nil || r.Body == nil {
return nil
}
defer r.Body.Close()
result, _ := io.ReadAll(r.Body)
return result
}
// String reads response body as string
func (r *Response) String() string {
if r == nil {
return ""
}
return string(r.Bytes())
}
// ////////////////////////////////////////////////////////////////////////////////// //
// Error shows error message
func (e RequestError) Error() string {
switch e.class {
case ERROR_BODY_ENCODE:
return fmt.Sprintf("Can't encode request body (%s)", e.desc)
case ERROR_SEND_REQUEST:
return fmt.Sprintf("Can't send request (%s)", e.desc)
default:
return fmt.Sprintf("Can't create request struct (%s)", e.desc)
}
}
// ////////////////////////////////////////////////////////////////////////////////// //
// Encode converts query struct to URL-encoded string
func (q Query) Encode() string {
var result strings.Builder
for k, v := range q {
switch u := v.(type) {
case string:
if v == "" {
result.WriteString(k)
} else {
result.WriteString(k)
result.WriteRune('=')
result.WriteString(url.QueryEscape(u))
}
case nil:
result.WriteString(k)
default:
result.WriteString(k)
result.WriteRune('=')
result.WriteString(url.QueryEscape(fmt.Sprintf("%v", v)))
}
result.WriteRune('&')
}
if result.Len() == 0 {
return ""
}
return result.String()[:result.Len()-1]
}
// ////////////////////////////////////////////////////////////////////////////////// //
// This method has a lot of actions to prepare request for executing, so it is ok to
// have so many conditions
// codebeat:disable[CYCLO,ABC]
func (e *Engine) doRequest(r Request, method string) (*Response, error) {
// Lazy engine initialization
if e != nil && !e.initialized {
e.Init()
}
err := checkEngine(e)
if err != nil {
return nil, err
}
err = checkRequest(r)
if err != nil {
return nil, err
}
if method != "" {
r.Method = method
}
if r.Method == "" {
r.Method = GET
}
if r.Query != nil && len(r.Query) != 0 {
r.URL += "?" + r.Query.Encode()
}
bodyReader, err := getBodyReader(r.Body)
if err != nil {
return nil, RequestError{ERROR_BODY_ENCODE, err.Error()}
}
req, err := createRequest(e, r, bodyReader)
if err != nil {
return nil, err
}
resp, err := e.Client.Do(req)
if err != nil {
return nil, RequestError{ERROR_SEND_REQUEST, err.Error()}
}
result := &Response{resp, r.URL}
if resp.StatusCode != STATUS_OK && r.AutoDiscard {
result.Discard()
}
return result, nil
}
// codebeat:enable[CYCLO,ABC]
// ////////////////////////////////////////////////////////////////////////////////// //
func checkRequest(r Request) error {
if r.URL == "" {
return ErrEmptyURL
}
if !isURL(r.URL) {
return ErrUnsupportedScheme
}
return nil
}
func checkEngine(e *Engine) error {
if e == nil {
return ErrNilEngine
}
if e.Dialer == nil {
return ErrNilDialer
}
if e.Transport == nil {
return ErrNilTransport
}
if e.Client == nil {
return ErrNilClient
}
return nil
}
func createRequest(e *Engine, r Request, bodyReader io.Reader) (*http.Request, error) {
req, err := http.NewRequest(r.Method, r.URL, bodyReader)
if err != nil {
return nil, RequestError{ERROR_CREATE_REQUEST, err.Error()}
}
if r.Headers != nil && len(r.Headers) != 0 {
for k, v := range r.Headers {
req.Header.Add(k, v)
}
}
if r.ContentType != "" {
req.Header.Add("Content-Type", r.ContentType)
}
if r.Accept != "" {
req.Header.Add("Accept", r.Accept)
}
if e.UserAgent != "" {
req.Header.Add("User-Agent", e.UserAgent)
}
if r.BasicAuthUsername != "" && r.BasicAuthPassword != "" {
req.SetBasicAuth(r.BasicAuthUsername, r.BasicAuthPassword)
}
if r.BearerAuth != "" {
req.Header.Add("Authorization", "Bearer "+r.BearerAuth)
}
if r.Close {
req.Close = true
}
return req, nil
}
func configureMultipartRequest(r *Request, file, fieldName string, extraFields map[string]string) error {
fd, err := os.OpenFile(file, os.O_RDONLY, 0)
if err != nil {
return err
}
defer fd.Close()
buf := &bytes.Buffer{}
w := multipart.NewWriter(buf)
part, err := createFormFile(w, fieldName, file)
if err != nil {
return err
}
_, err = ioCopyFunc(part, fd)
if err != nil {
return err
}
for k, v := range extraFields {
w.WriteField(k, v)
}
w.Close()
r.ContentType = w.FormDataContentType()
r.Body = buf
return nil
}
func createFormFile(w *multipart.Writer, fieldName, file string) (io.Writer, error) {
if useFakeFormGenerator {
return nil, fmt.Errorf("")
}
return w.CreateFormFile(fieldName, filepath.Base(file))
}
func getBodyReader(body any) (io.Reader, error) {
switch u := body.(type) {
case nil:
return nil, nil
case string:
return strings.NewReader(u), nil
case io.Reader:
return u, nil
case []byte:
return bytes.NewReader(u), nil
default:
jsonBody, err := json.MarshalIndent(body, "", " ")
if err == nil {
return bytes.NewReader(jsonBody), nil
}
return nil, err
}
}
func isURL(url string) bool {
switch {
case len(url) < 10:
return false
case url[0:7] == "http://":
return true
case url[0:8] == "https://":
return true
case url[0:6] == "ftp://":
return true
}
return false
}