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request.go
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request.go
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package stgin
import (
"encoding/json"
"encoding/xml"
"io"
"mime/multipart"
"net/http"
"time"
)
// RequestContext holds all the information about incoming http requests.
type RequestContext struct {
Url string
QueryParams Queries
PathParams PathParams
Headers http.Header
Trailer http.Header
Body func() *RequestBody
receivedAt time.Time
Method string
ContentLength int64
Host string
MultipartForm func() *multipart.Form
Scheme string
RemoteAddr string
underlying *http.Request
HttpPush Push
}
func (request RequestContext) ReceivedAt() time.Time {
return request.receivedAt
}
// Push is a struct that represents both the ability, and the functionality of http push inside this request.
type Push struct {
IsSupported bool
pusher http.Pusher
}
// Pusher returns the actual http.Pusher instance, only if it's supported.
// Note that this will panic if it's not supported, so make sure to use IsSupported field before calling this function.
func (p Push) Pusher() http.Pusher {
if !p.IsSupported {
panic("pusher is not supported in the request")
}
return p.pusher
}
// Cookies returns the cookies that are attached to the request.
func (request RequestContext) Cookies() []*http.Cookie {
return request.underlying.Cookies()
}
// Referer returns the value of referer header in http request, returns empty string if it does not exist.
func (request RequestContext) Referer() string { return request.underlying.Referer() }
// UserAgent returns the value of request's user agent, returns empty string if it does not exist.
func (request RequestContext) UserAgent() string { return request.underlying.UserAgent() }
// Cookie tries to find a cookie with the given name.
func (request RequestContext) Cookie(name string) (*http.Cookie, error) {
return request.underlying.Cookie(name)
}
// FormValue is a shortcut to get a value by name inside the request form instead of parsing the whole form.
func (request RequestContext) FormValue(key string) string {
return request.underlying.FormValue(key)
}
// FormFile is a shortcut to get a file with the given name from multipart form.
func (request RequestContext) FormFile(key string) (multipart.File, *multipart.FileHeader, error) {
return request.underlying.FormFile(key)
}
// PostFormValue can get a value by the given name from request post-form.
func (request RequestContext) PostFormValue(key string) string {
return request.underlying.PostFormValue(key)
}
// ParseMultipartForm is the manual approach to parse the request's entity to multipart form.
// Please read (*http.Request).ParseMultipartForm for more detailed information.
func (request RequestContext) ParseMultipartForm(maxMemory int64) error {
return request.underlying.ParseMultipartForm(maxMemory)
}
// Form returns all the key-values inside the given request.
// It calls ParseForm itself.
func (request RequestContext) Form() (map[string][]string, error) {
if err := request.underlying.ParseForm(); err != nil {
return nil, err
}
return request.underlying.Form, nil
}
// PostForm returns all the key-values inside the given request's post-form.
func (request RequestContext) PostForm() (map[string][]string, error) {
if err := request.underlying.ParseForm(); err != nil {
return nil, err
} else {
return request.underlying.PostForm, nil
}
}
// AddCookie adds the cookie to the request.
func (request RequestContext) AddCookie(cookie *http.Cookie) {
request.underlying.AddCookie(cookie)
}
// RequestBody holds the bytes of the request's body entity.
type RequestBody struct {
underlying io.Reader
underlyingBytes []byte
hasFilledBytes bool
}
func bodyFromBytes(bytes []byte) *RequestBody {
return &RequestBody{
underlying: nil,
underlyingBytes: bytes,
hasFilledBytes: true,
}
}
func bodyFromReadCloser(reader io.ReadCloser) (*RequestBody, error) {
defer func(r io.ReadCloser) {
err := r.Close()
if err != nil {
_ = stginLogger.Err("could not close reader stream from request")
}
}(reader)
bytes, err := io.ReadAll(reader)
if err != nil {
return nil, err
} else {
return bodyFromBytes(bytes), nil
}
}
func requestContextFromHttpRequest(request *http.Request, writer http.ResponseWriter, pathParams Params) RequestContext {
var pusher http.Pusher
var isSupported bool
if writer != nil {
pusher, isSupported = writer.(http.Pusher)
}
var headers http.Header
if request.Header == nil {
headers = emptyHeaders
} else {
headers = request.Header
}
return RequestContext{
Url: request.URL.Path,
QueryParams: Queries{request.URL.Query()},
PathParams: PathParams{pathParams},
Headers: headers,
Trailer: request.Trailer,
Body: func() *RequestBody {
var body *RequestBody
if request.Body != nil {
body, _ = bodyFromReadCloser(request.Body)
}
return body
},
receivedAt: time.Now(),
Method: request.Method,
ContentLength: request.ContentLength,
Host: request.Host,
MultipartForm: func() *multipart.Form {
return request.MultipartForm
},
Scheme: request.URL.Scheme,
RemoteAddr: request.RemoteAddr,
underlying: request,
HttpPush: Push{
IsSupported: isSupported,
pusher: pusher,
},
}
}
func (body *RequestBody) fillAndGetBytes() ([]byte, *MalformedRequestContext) {
if body.hasFilledBytes {
return body.underlyingBytes, nil
} else {
bytes, err := io.ReadAll(body.underlying)
if err != nil {
return []byte{}, &MalformedRequestContext{details: err.Error()}
}
body.underlyingBytes = bytes
body.hasFilledBytes = true
return bytes, nil
}
}
// SafeJSONInto receives a pointer to anything, and will try to parse the request bytes into it as JSON.
// if any error occurs, it is returned immediately by the function.
func (body *RequestBody) SafeJSONInto(a any) error {
bytes, err := body.fillAndGetBytes()
if err != nil {
return *err
}
if unmarshalErr := json.Unmarshal(bytes, a); unmarshalErr != nil {
return ParseError{
tpe: "JSON",
details: unmarshalErr.Error(),
}
} else {
return nil
}
}
// SafeXMLInto receives a pointer to anything, and will try to parse the request bytes into it as JSON.
// if any error occurs, it is returned immediately by the function.
func (body *RequestBody) SafeXMLInto(a any) error {
bytes, err := body.fillAndGetBytes()
if err != nil {
return *err
}
if unmarshalErr := xml.Unmarshal(bytes, a); unmarshalErr != nil {
return ParseError{
tpe: "XML",
details: unmarshalErr.Error(),
}
} else {
return nil
}
}
// JSONInto receives a pointer to anything, and will try to parse the request's JSON entity into it.
// It panics in case any error happens.
func (body *RequestBody) JSONInto(a any) {
bytes, err := body.fillAndGetBytes()
if err != nil {
panic(err)
}
if unmarshalErr := json.Unmarshal(bytes, a); unmarshalErr != nil {
panic(ParseError{details: err.Error(), tpe: "JSON"})
}
}
// XMLInto receives a pointer to anything, and will try to parse the request's XML entity into it.
// It panics in case any error happens.
func (body *RequestBody) XMLInto(a any) {
bytes, err := body.fillAndGetBytes()
if err != nil {
panic(err)
}
if unmarshalErr := xml.Unmarshal(bytes, a); unmarshalErr != nil {
panic(ParseError{
tpe: "XML",
details: err.Error(),
})
}
}