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-rw-r--r--src/net/http/request.go920
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diff --git a/src/net/http/request.go b/src/net/http/request.go
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+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// HTTP Request reading and parsing.
+
+package http
+
+import (
+ "bufio"
+ "bytes"
+ "crypto/tls"
+ "encoding/base64"
+ "errors"
+ "fmt"
+ "io"
+ "io/ioutil"
+ "mime"
+ "mime/multipart"
+ "net/textproto"
+ "net/url"
+ "strconv"
+ "strings"
+ "sync"
+)
+
+const (
+ maxValueLength = 4096
+ maxHeaderLines = 1024
+ chunkSize = 4 << 10 // 4 KB chunks
+ defaultMaxMemory = 32 << 20 // 32 MB
+)
+
+// ErrMissingFile is returned by FormFile when the provided file field name
+// is either not present in the request or not a file field.
+var ErrMissingFile = errors.New("http: no such file")
+
+// HTTP request parsing errors.
+type ProtocolError struct {
+ ErrorString string
+}
+
+func (err *ProtocolError) Error() string { return err.ErrorString }
+
+var (
+ ErrHeaderTooLong = &ProtocolError{"header too long"}
+ ErrShortBody = &ProtocolError{"entity body too short"}
+ ErrNotSupported = &ProtocolError{"feature not supported"}
+ ErrUnexpectedTrailer = &ProtocolError{"trailer header without chunked transfer encoding"}
+ ErrMissingContentLength = &ProtocolError{"missing ContentLength in HEAD response"}
+ ErrNotMultipart = &ProtocolError{"request Content-Type isn't multipart/form-data"}
+ ErrMissingBoundary = &ProtocolError{"no multipart boundary param in Content-Type"}
+)
+
+type badStringError struct {
+ what string
+ str string
+}
+
+func (e *badStringError) Error() string { return fmt.Sprintf("%s %q", e.what, e.str) }
+
+// Headers that Request.Write handles itself and should be skipped.
+var reqWriteExcludeHeader = map[string]bool{
+ "Host": true, // not in Header map anyway
+ "User-Agent": true,
+ "Content-Length": true,
+ "Transfer-Encoding": true,
+ "Trailer": true,
+}
+
+// A Request represents an HTTP request received by a server
+// or to be sent by a client.
+//
+// The field semantics differ slightly between client and server
+// usage. In addition to the notes on the fields below, see the
+// documentation for Request.Write and RoundTripper.
+type Request struct {
+ // Method specifies the HTTP method (GET, POST, PUT, etc.).
+ // For client requests an empty string means GET.
+ Method string
+
+ // URL specifies either the URI being requested (for server
+ // requests) or the URL to access (for client requests).
+ //
+ // For server requests the URL is parsed from the URI
+ // supplied on the Request-Line as stored in RequestURI. For
+ // most requests, fields other than Path and RawQuery will be
+ // empty. (See RFC 2616, Section 5.1.2)
+ //
+ // For client requests, the URL's Host specifies the server to
+ // connect to, while the Request's Host field optionally
+ // specifies the Host header value to send in the HTTP
+ // request.
+ URL *url.URL
+
+ // The protocol version for incoming requests.
+ // Client requests always use HTTP/1.1.
+ Proto string // "HTTP/1.0"
+ ProtoMajor int // 1
+ ProtoMinor int // 0
+
+ // A header maps request lines to their values.
+ // If the header says
+ //
+ // accept-encoding: gzip, deflate
+ // Accept-Language: en-us
+ // Connection: keep-alive
+ //
+ // then
+ //
+ // Header = map[string][]string{
+ // "Accept-Encoding": {"gzip, deflate"},
+ // "Accept-Language": {"en-us"},
+ // "Connection": {"keep-alive"},
+ // }
+ //
+ // HTTP defines that header names are case-insensitive.
+ // The request parser implements this by canonicalizing the
+ // name, making the first character and any characters
+ // following a hyphen uppercase and the rest lowercase.
+ //
+ // For client requests certain headers are automatically
+ // added and may override values in Header.
+ //
+ // See the documentation for the Request.Write method.
+ Header Header
+
+ // Body is the request's body.
+ //
+ // For client requests a nil body means the request has no
+ // body, such as a GET request. The HTTP Client's Transport
+ // is responsible for calling the Close method.
+ //
+ // For server requests the Request Body is always non-nil
+ // but will return EOF immediately when no body is present.
+ // The Server will close the request body. The ServeHTTP
+ // Handler does not need to.
+ Body io.ReadCloser
+
+ // ContentLength records the length of the associated content.
+ // The value -1 indicates that the length is unknown.
+ // Values >= 0 indicate that the given number of bytes may
+ // be read from Body.
+ // For client requests, a value of 0 means unknown if Body is not nil.
+ ContentLength int64
+
+ // TransferEncoding lists the transfer encodings from outermost to
+ // innermost. An empty list denotes the "identity" encoding.
+ // TransferEncoding can usually be ignored; chunked encoding is
+ // automatically added and removed as necessary when sending and
+ // receiving requests.
+ TransferEncoding []string
+
+ // Close indicates whether to close the connection after
+ // replying to this request (for servers) or after sending
+ // the request (for clients).
+ Close bool
+
+ // For server requests Host specifies the host on which the
+ // URL is sought. Per RFC 2616, this is either the value of
+ // the "Host" header or the host name given in the URL itself.
+ // It may be of the form "host:port".
+ //
+ // For client requests Host optionally overrides the Host
+ // header to send. If empty, the Request.Write method uses
+ // the value of URL.Host.
+ Host string
+
+ // Form contains the parsed form data, including both the URL
+ // field's query parameters and the POST or PUT form data.
+ // This field is only available after ParseForm is called.
+ // The HTTP client ignores Form and uses Body instead.
+ Form url.Values
+
+ // PostForm contains the parsed form data from POST or PUT
+ // body parameters.
+ // This field is only available after ParseForm is called.
+ // The HTTP client ignores PostForm and uses Body instead.
+ PostForm url.Values
+
+ // MultipartForm is the parsed multipart form, including file uploads.
+ // This field is only available after ParseMultipartForm is called.
+ // The HTTP client ignores MultipartForm and uses Body instead.
+ MultipartForm *multipart.Form
+
+ // Trailer specifies additional headers that are sent after the request
+ // body.
+ //
+ // For server requests the Trailer map initially contains only the
+ // trailer keys, with nil values. (The client declares which trailers it
+ // will later send.) While the handler is reading from Body, it must
+ // not reference Trailer. After reading from Body returns EOF, Trailer
+ // can be read again and will contain non-nil values, if they were sent
+ // by the client.
+ //
+ // For client requests Trailer must be initialized to a map containing
+ // the trailer keys to later send. The values may be nil or their final
+ // values. The ContentLength must be 0 or -1, to send a chunked request.
+ // After the HTTP request is sent the map values can be updated while
+ // the request body is read. Once the body returns EOF, the caller must
+ // not mutate Trailer.
+ //
+ // Few HTTP clients, servers, or proxies support HTTP trailers.
+ Trailer Header
+
+ // RemoteAddr allows HTTP servers and other software to record
+ // the network address that sent the request, usually for
+ // logging. This field is not filled in by ReadRequest and
+ // has no defined format. The HTTP server in this package
+ // sets RemoteAddr to an "IP:port" address before invoking a
+ // handler.
+ // This field is ignored by the HTTP client.
+ RemoteAddr string
+
+ // RequestURI is the unmodified Request-URI of the
+ // Request-Line (RFC 2616, Section 5.1) as sent by the client
+ // to a server. Usually the URL field should be used instead.
+ // It is an error to set this field in an HTTP client request.
+ RequestURI string
+
+ // TLS allows HTTP servers and other software to record
+ // information about the TLS connection on which the request
+ // was received. This field is not filled in by ReadRequest.
+ // The HTTP server in this package sets the field for
+ // TLS-enabled connections before invoking a handler;
+ // otherwise it leaves the field nil.
+ // This field is ignored by the HTTP client.
+ TLS *tls.ConnectionState
+}
+
+// ProtoAtLeast reports whether the HTTP protocol used
+// in the request is at least major.minor.
+func (r *Request) ProtoAtLeast(major, minor int) bool {
+ return r.ProtoMajor > major ||
+ r.ProtoMajor == major && r.ProtoMinor >= minor
+}
+
+// UserAgent returns the client's User-Agent, if sent in the request.
+func (r *Request) UserAgent() string {
+ return r.Header.Get("User-Agent")
+}
+
+// Cookies parses and returns the HTTP cookies sent with the request.
+func (r *Request) Cookies() []*Cookie {
+ return readCookies(r.Header, "")
+}
+
+var ErrNoCookie = errors.New("http: named cookie not present")
+
+// Cookie returns the named cookie provided in the request or
+// ErrNoCookie if not found.
+func (r *Request) Cookie(name string) (*Cookie, error) {
+ for _, c := range readCookies(r.Header, name) {
+ return c, nil
+ }
+ return nil, ErrNoCookie
+}
+
+// AddCookie adds a cookie to the request. Per RFC 6265 section 5.4,
+// AddCookie does not attach more than one Cookie header field. That
+// means all cookies, if any, are written into the same line,
+// separated by semicolon.
+func (r *Request) AddCookie(c *Cookie) {
+ s := fmt.Sprintf("%s=%s", sanitizeCookieName(c.Name), sanitizeCookieValue(c.Value))
+ if c := r.Header.Get("Cookie"); c != "" {
+ r.Header.Set("Cookie", c+"; "+s)
+ } else {
+ r.Header.Set("Cookie", s)
+ }
+}
+
+// Referer returns the referring URL, if sent in the request.
+//
+// Referer is misspelled as in the request itself, a mistake from the
+// earliest days of HTTP. This value can also be fetched from the
+// Header map as Header["Referer"]; the benefit of making it available
+// as a method is that the compiler can diagnose programs that use the
+// alternate (correct English) spelling req.Referrer() but cannot
+// diagnose programs that use Header["Referrer"].
+func (r *Request) Referer() string {
+ return r.Header.Get("Referer")
+}
+
+// multipartByReader is a sentinel value.
+// Its presence in Request.MultipartForm indicates that parsing of the request
+// body has been handed off to a MultipartReader instead of ParseMultipartFrom.
+var multipartByReader = &multipart.Form{
+ Value: make(map[string][]string),
+ File: make(map[string][]*multipart.FileHeader),
+}
+
+// MultipartReader returns a MIME multipart reader if this is a
+// multipart/form-data POST request, else returns nil and an error.
+// Use this function instead of ParseMultipartForm to
+// process the request body as a stream.
+func (r *Request) MultipartReader() (*multipart.Reader, error) {
+ if r.MultipartForm == multipartByReader {
+ return nil, errors.New("http: MultipartReader called twice")
+ }
+ if r.MultipartForm != nil {
+ return nil, errors.New("http: multipart handled by ParseMultipartForm")
+ }
+ r.MultipartForm = multipartByReader
+ return r.multipartReader()
+}
+
+func (r *Request) multipartReader() (*multipart.Reader, error) {
+ v := r.Header.Get("Content-Type")
+ if v == "" {
+ return nil, ErrNotMultipart
+ }
+ d, params, err := mime.ParseMediaType(v)
+ if err != nil || d != "multipart/form-data" {
+ return nil, ErrNotMultipart
+ }
+ boundary, ok := params["boundary"]
+ if !ok {
+ return nil, ErrMissingBoundary
+ }
+ return multipart.NewReader(r.Body, boundary), nil
+}
+
+// Return value if nonempty, def otherwise.
+func valueOrDefault(value, def string) string {
+ if value != "" {
+ return value
+ }
+ return def
+}
+
+// NOTE: This is not intended to reflect the actual Go version being used.
+// It was changed from "Go http package" to "Go 1.1 package http" at the
+// time of the Go 1.1 release because the former User-Agent had ended up
+// on a blacklist for some intrusion detection systems.
+// See https://codereview.appspot.com/7532043.
+const defaultUserAgent = "Go 1.1 package http"
+
+// Write writes an HTTP/1.1 request -- header and body -- in wire format.
+// This method consults the following fields of the request:
+// Host
+// URL
+// Method (defaults to "GET")
+// Header
+// ContentLength
+// TransferEncoding
+// Body
+//
+// If Body is present, Content-Length is <= 0 and TransferEncoding
+// hasn't been set to "identity", Write adds "Transfer-Encoding:
+// chunked" to the header. Body is closed after it is sent.
+func (r *Request) Write(w io.Writer) error {
+ return r.write(w, false, nil)
+}
+
+// WriteProxy is like Write but writes the request in the form
+// expected by an HTTP proxy. In particular, WriteProxy writes the
+// initial Request-URI line of the request with an absolute URI, per
+// section 5.1.2 of RFC 2616, including the scheme and host.
+// In either case, WriteProxy also writes a Host header, using
+// either r.Host or r.URL.Host.
+func (r *Request) WriteProxy(w io.Writer) error {
+ return r.write(w, true, nil)
+}
+
+// extraHeaders may be nil
+func (req *Request) write(w io.Writer, usingProxy bool, extraHeaders Header) error {
+ host := req.Host
+ if host == "" {
+ if req.URL == nil {
+ return errors.New("http: Request.Write on Request with no Host or URL set")
+ }
+ host = req.URL.Host
+ }
+
+ ruri := req.URL.RequestURI()
+ if usingProxy && req.URL.Scheme != "" && req.URL.Opaque == "" {
+ ruri = req.URL.Scheme + "://" + host + ruri
+ } else if req.Method == "CONNECT" && req.URL.Path == "" {
+ // CONNECT requests normally give just the host and port, not a full URL.
+ ruri = host
+ }
+ // TODO(bradfitz): escape at least newlines in ruri?
+
+ // Wrap the writer in a bufio Writer if it's not already buffered.
+ // Don't always call NewWriter, as that forces a bytes.Buffer
+ // and other small bufio Writers to have a minimum 4k buffer
+ // size.
+ var bw *bufio.Writer
+ if _, ok := w.(io.ByteWriter); !ok {
+ bw = bufio.NewWriter(w)
+ w = bw
+ }
+
+ _, err := fmt.Fprintf(w, "%s %s HTTP/1.1\r\n", valueOrDefault(req.Method, "GET"), ruri)
+ if err != nil {
+ return err
+ }
+
+ // Header lines
+ _, err = fmt.Fprintf(w, "Host: %s\r\n", host)
+ if err != nil {
+ return err
+ }
+
+ // Use the defaultUserAgent unless the Header contains one, which
+ // may be blank to not send the header.
+ userAgent := defaultUserAgent
+ if req.Header != nil {
+ if ua := req.Header["User-Agent"]; len(ua) > 0 {
+ userAgent = ua[0]
+ }
+ }
+ if userAgent != "" {
+ _, err = fmt.Fprintf(w, "User-Agent: %s\r\n", userAgent)
+ if err != nil {
+ return err
+ }
+ }
+
+ // Process Body,ContentLength,Close,Trailer
+ tw, err := newTransferWriter(req)
+ if err != nil {
+ return err
+ }
+ err = tw.WriteHeader(w)
+ if err != nil {
+ return err
+ }
+
+ err = req.Header.WriteSubset(w, reqWriteExcludeHeader)
+ if err != nil {
+ return err
+ }
+
+ if extraHeaders != nil {
+ err = extraHeaders.Write(w)
+ if err != nil {
+ return err
+ }
+ }
+
+ _, err = io.WriteString(w, "\r\n")
+ if err != nil {
+ return err
+ }
+
+ // Write body and trailer
+ err = tw.WriteBody(w)
+ if err != nil {
+ return err
+ }
+
+ if bw != nil {
+ return bw.Flush()
+ }
+ return nil
+}
+
+// ParseHTTPVersion parses a HTTP version string.
+// "HTTP/1.0" returns (1, 0, true).
+func ParseHTTPVersion(vers string) (major, minor int, ok bool) {
+ const Big = 1000000 // arbitrary upper bound
+ switch vers {
+ case "HTTP/1.1":
+ return 1, 1, true
+ case "HTTP/1.0":
+ return 1, 0, true
+ }
+ if !strings.HasPrefix(vers, "HTTP/") {
+ return 0, 0, false
+ }
+ dot := strings.Index(vers, ".")
+ if dot < 0 {
+ return 0, 0, false
+ }
+ major, err := strconv.Atoi(vers[5:dot])
+ if err != nil || major < 0 || major > Big {
+ return 0, 0, false
+ }
+ minor, err = strconv.Atoi(vers[dot+1:])
+ if err != nil || minor < 0 || minor > Big {
+ return 0, 0, false
+ }
+ return major, minor, true
+}
+
+// NewRequest returns a new Request given a method, URL, and optional body.
+//
+// If the provided body is also an io.Closer, the returned
+// Request.Body is set to body and will be closed by the Client
+// methods Do, Post, and PostForm, and Transport.RoundTrip.
+func NewRequest(method, urlStr string, body io.Reader) (*Request, error) {
+ u, err := url.Parse(urlStr)
+ if err != nil {
+ return nil, err
+ }
+ rc, ok := body.(io.ReadCloser)
+ if !ok && body != nil {
+ rc = ioutil.NopCloser(body)
+ }
+ req := &Request{
+ Method: method,
+ URL: u,
+ Proto: "HTTP/1.1",
+ ProtoMajor: 1,
+ ProtoMinor: 1,
+ Header: make(Header),
+ Body: rc,
+ Host: u.Host,
+ }
+ if body != nil {
+ switch v := body.(type) {
+ case *bytes.Buffer:
+ req.ContentLength = int64(v.Len())
+ case *bytes.Reader:
+ req.ContentLength = int64(v.Len())
+ case *strings.Reader:
+ req.ContentLength = int64(v.Len())
+ }
+ }
+
+ return req, nil
+}
+
+// BasicAuth returns the username and password provided in the request's
+// Authorization header, if the request uses HTTP Basic Authentication.
+// See RFC 2617, Section 2.
+func (r *Request) BasicAuth() (username, password string, ok bool) {
+ auth := r.Header.Get("Authorization")
+ if auth == "" {
+ return
+ }
+ return parseBasicAuth(auth)
+}
+
+// parseBasicAuth parses an HTTP Basic Authentication string.
+// "Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==" returns ("Aladdin", "open sesame", true).
+func parseBasicAuth(auth string) (username, password string, ok bool) {
+ if !strings.HasPrefix(auth, "Basic ") {
+ return
+ }
+ c, err := base64.StdEncoding.DecodeString(strings.TrimPrefix(auth, "Basic "))
+ if err != nil {
+ return
+ }
+ cs := string(c)
+ s := strings.IndexByte(cs, ':')
+ if s < 0 {
+ return
+ }
+ return cs[:s], cs[s+1:], true
+}
+
+// SetBasicAuth sets the request's Authorization header to use HTTP
+// Basic Authentication with the provided username and password.
+//
+// With HTTP Basic Authentication the provided username and password
+// are not encrypted.
+func (r *Request) SetBasicAuth(username, password string) {
+ r.Header.Set("Authorization", "Basic "+basicAuth(username, password))
+}
+
+// parseRequestLine parses "GET /foo HTTP/1.1" into its three parts.
+func parseRequestLine(line string) (method, requestURI, proto string, ok bool) {
+ s1 := strings.Index(line, " ")
+ s2 := strings.Index(line[s1+1:], " ")
+ if s1 < 0 || s2 < 0 {
+ return
+ }
+ s2 += s1 + 1
+ return line[:s1], line[s1+1 : s2], line[s2+1:], true
+}
+
+var textprotoReaderPool sync.Pool
+
+func newTextprotoReader(br *bufio.Reader) *textproto.Reader {
+ if v := textprotoReaderPool.Get(); v != nil {
+ tr := v.(*textproto.Reader)
+ tr.R = br
+ return tr
+ }
+ return textproto.NewReader(br)
+}
+
+func putTextprotoReader(r *textproto.Reader) {
+ r.R = nil
+ textprotoReaderPool.Put(r)
+}
+
+// ReadRequest reads and parses a request from b.
+func ReadRequest(b *bufio.Reader) (req *Request, err error) {
+
+ tp := newTextprotoReader(b)
+ req = new(Request)
+
+ // First line: GET /index.html HTTP/1.0
+ var s string
+ if s, err = tp.ReadLine(); err != nil {
+ return nil, err
+ }
+ defer func() {
+ putTextprotoReader(tp)
+ if err == io.EOF {
+ err = io.ErrUnexpectedEOF
+ }
+ }()
+
+ var ok bool
+ req.Method, req.RequestURI, req.Proto, ok = parseRequestLine(s)
+ if !ok {
+ return nil, &badStringError{"malformed HTTP request", s}
+ }
+ rawurl := req.RequestURI
+ if req.ProtoMajor, req.ProtoMinor, ok = ParseHTTPVersion(req.Proto); !ok {
+ return nil, &badStringError{"malformed HTTP version", req.Proto}
+ }
+
+ // CONNECT requests are used two different ways, and neither uses a full URL:
+ // The standard use is to tunnel HTTPS through an HTTP proxy.
+ // It looks like "CONNECT www.google.com:443 HTTP/1.1", and the parameter is
+ // just the authority section of a URL. This information should go in req.URL.Host.
+ //
+ // The net/rpc package also uses CONNECT, but there the parameter is a path
+ // that starts with a slash. It can be parsed with the regular URL parser,
+ // and the path will end up in req.URL.Path, where it needs to be in order for
+ // RPC to work.
+ justAuthority := req.Method == "CONNECT" && !strings.HasPrefix(rawurl, "/")
+ if justAuthority {
+ rawurl = "http://" + rawurl
+ }
+
+ if req.URL, err = url.ParseRequestURI(rawurl); err != nil {
+ return nil, err
+ }
+
+ if justAuthority {
+ // Strip the bogus "http://" back off.
+ req.URL.Scheme = ""
+ }
+
+ // Subsequent lines: Key: value.
+ mimeHeader, err := tp.ReadMIMEHeader()
+ if err != nil {
+ return nil, err
+ }
+ req.Header = Header(mimeHeader)
+
+ // RFC2616: Must treat
+ // GET /index.html HTTP/1.1
+ // Host: www.google.com
+ // and
+ // GET http://www.google.com/index.html HTTP/1.1
+ // Host: doesntmatter
+ // the same. In the second case, any Host line is ignored.
+ req.Host = req.URL.Host
+ if req.Host == "" {
+ req.Host = req.Header.get("Host")
+ }
+ delete(req.Header, "Host")
+
+ fixPragmaCacheControl(req.Header)
+
+ err = readTransfer(req, b)
+ if err != nil {
+ return nil, err
+ }
+
+ req.Close = shouldClose(req.ProtoMajor, req.ProtoMinor, req.Header, false)
+ return req, nil
+}
+
+// MaxBytesReader is similar to io.LimitReader but is intended for
+// limiting the size of incoming request bodies. In contrast to
+// io.LimitReader, MaxBytesReader's result is a ReadCloser, returns a
+// non-EOF error for a Read beyond the limit, and Closes the
+// underlying reader when its Close method is called.
+//
+// MaxBytesReader prevents clients from accidentally or maliciously
+// sending a large request and wasting server resources.
+func MaxBytesReader(w ResponseWriter, r io.ReadCloser, n int64) io.ReadCloser {
+ return &maxBytesReader{w: w, r: r, n: n}
+}
+
+type maxBytesReader struct {
+ w ResponseWriter
+ r io.ReadCloser // underlying reader
+ n int64 // max bytes remaining
+ stopped bool
+}
+
+func (l *maxBytesReader) Read(p []byte) (n int, err error) {
+ if l.n <= 0 {
+ if !l.stopped {
+ l.stopped = true
+ if res, ok := l.w.(*response); ok {
+ res.requestTooLarge()
+ }
+ }
+ return 0, errors.New("http: request body too large")
+ }
+ if int64(len(p)) > l.n {
+ p = p[:l.n]
+ }
+ n, err = l.r.Read(p)
+ l.n -= int64(n)
+ return
+}
+
+func (l *maxBytesReader) Close() error {
+ return l.r.Close()
+}
+
+func copyValues(dst, src url.Values) {
+ for k, vs := range src {
+ for _, value := range vs {
+ dst.Add(k, value)
+ }
+ }
+}
+
+func parsePostForm(r *Request) (vs url.Values, err error) {
+ if r.Body == nil {
+ err = errors.New("missing form body")
+ return
+ }
+ ct := r.Header.Get("Content-Type")
+ // RFC 2616, section 7.2.1 - empty type
+ // SHOULD be treated as application/octet-stream
+ if ct == "" {
+ ct = "application/octet-stream"
+ }
+ ct, _, err = mime.ParseMediaType(ct)
+ switch {
+ case ct == "application/x-www-form-urlencoded":
+ var reader io.Reader = r.Body
+ maxFormSize := int64(1<<63 - 1)
+ if _, ok := r.Body.(*maxBytesReader); !ok {
+ maxFormSize = int64(10 << 20) // 10 MB is a lot of text.
+ reader = io.LimitReader(r.Body, maxFormSize+1)
+ }
+ b, e := ioutil.ReadAll(reader)
+ if e != nil {
+ if err == nil {
+ err = e
+ }
+ break
+ }
+ if int64(len(b)) > maxFormSize {
+ err = errors.New("http: POST too large")
+ return
+ }
+ vs, e = url.ParseQuery(string(b))
+ if err == nil {
+ err = e
+ }
+ case ct == "multipart/form-data":
+ // handled by ParseMultipartForm (which is calling us, or should be)
+ // TODO(bradfitz): there are too many possible
+ // orders to call too many functions here.
+ // Clean this up and write more tests.
+ // request_test.go contains the start of this,
+ // in TestParseMultipartFormOrder and others.
+ }
+ return
+}
+
+// ParseForm parses the raw query from the URL and updates r.Form.
+//
+// For POST or PUT requests, it also parses the request body as a form and
+// put the results into both r.PostForm and r.Form.
+// POST and PUT body parameters take precedence over URL query string values
+// in r.Form.
+//
+// If the request Body's size has not already been limited by MaxBytesReader,
+// the size is capped at 10MB.
+//
+// ParseMultipartForm calls ParseForm automatically.
+// It is idempotent.
+func (r *Request) ParseForm() error {
+ var err error
+ if r.PostForm == nil {
+ if r.Method == "POST" || r.Method == "PUT" || r.Method == "PATCH" {
+ r.PostForm, err = parsePostForm(r)
+ }
+ if r.PostForm == nil {
+ r.PostForm = make(url.Values)
+ }
+ }
+ if r.Form == nil {
+ if len(r.PostForm) > 0 {
+ r.Form = make(url.Values)
+ copyValues(r.Form, r.PostForm)
+ }
+ var newValues url.Values
+ if r.URL != nil {
+ var e error
+ newValues, e = url.ParseQuery(r.URL.RawQuery)
+ if err == nil {
+ err = e
+ }
+ }
+ if newValues == nil {
+ newValues = make(url.Values)
+ }
+ if r.Form == nil {
+ r.Form = newValues
+ } else {
+ copyValues(r.Form, newValues)
+ }
+ }
+ return err
+}
+
+// ParseMultipartForm parses a request body as multipart/form-data.
+// The whole request body is parsed and up to a total of maxMemory bytes of
+// its file parts are stored in memory, with the remainder stored on
+// disk in temporary files.
+// ParseMultipartForm calls ParseForm if necessary.
+// After one call to ParseMultipartForm, subsequent calls have no effect.
+func (r *Request) ParseMultipartForm(maxMemory int64) error {
+ if r.MultipartForm == multipartByReader {
+ return errors.New("http: multipart handled by MultipartReader")
+ }
+ if r.Form == nil {
+ err := r.ParseForm()
+ if err != nil {
+ return err
+ }
+ }
+ if r.MultipartForm != nil {
+ return nil
+ }
+
+ mr, err := r.multipartReader()
+ if err != nil {
+ return err
+ }
+
+ f, err := mr.ReadForm(maxMemory)
+ if err != nil {
+ return err
+ }
+ for k, v := range f.Value {
+ r.Form[k] = append(r.Form[k], v...)
+ }
+ r.MultipartForm = f
+
+ return nil
+}
+
+// FormValue returns the first value for the named component of the query.
+// POST and PUT body parameters take precedence over URL query string values.
+// FormValue calls ParseMultipartForm and ParseForm if necessary and ignores
+// any errors returned by these functions.
+// To access multiple values of the same key use ParseForm.
+func (r *Request) FormValue(key string) string {
+ if r.Form == nil {
+ r.ParseMultipartForm(defaultMaxMemory)
+ }
+ if vs := r.Form[key]; len(vs) > 0 {
+ return vs[0]
+ }
+ return ""
+}
+
+// PostFormValue returns the first value for the named component of the POST
+// or PUT request body. URL query parameters are ignored.
+// PostFormValue calls ParseMultipartForm and ParseForm if necessary and ignores
+// any errors returned by these functions.
+func (r *Request) PostFormValue(key string) string {
+ if r.PostForm == nil {
+ r.ParseMultipartForm(defaultMaxMemory)
+ }
+ if vs := r.PostForm[key]; len(vs) > 0 {
+ return vs[0]
+ }
+ return ""
+}
+
+// FormFile returns the first file for the provided form key.
+// FormFile calls ParseMultipartForm and ParseForm if necessary.
+func (r *Request) FormFile(key string) (multipart.File, *multipart.FileHeader, error) {
+ if r.MultipartForm == multipartByReader {
+ return nil, nil, errors.New("http: multipart handled by MultipartReader")
+ }
+ if r.MultipartForm == nil {
+ err := r.ParseMultipartForm(defaultMaxMemory)
+ if err != nil {
+ return nil, nil, err
+ }
+ }
+ if r.MultipartForm != nil && r.MultipartForm.File != nil {
+ if fhs := r.MultipartForm.File[key]; len(fhs) > 0 {
+ f, err := fhs[0].Open()
+ return f, fhs[0], err
+ }
+ }
+ return nil, nil, ErrMissingFile
+}
+
+func (r *Request) expectsContinue() bool {
+ return hasToken(r.Header.get("Expect"), "100-continue")
+}
+
+func (r *Request) wantsHttp10KeepAlive() bool {
+ if r.ProtoMajor != 1 || r.ProtoMinor != 0 {
+ return false
+ }
+ return hasToken(r.Header.get("Connection"), "keep-alive")
+}
+
+func (r *Request) wantsClose() bool {
+ return hasToken(r.Header.get("Connection"), "close")
+}
+
+func (r *Request) closeBody() {
+ if r.Body != nil {
+ r.Body.Close()
+ }
+}
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