1 files changed, 304 insertions, 0 deletions
diff --git a/libgo/go/net/http/client.go b/libgo/go/net/http/client.go
new file mode 100644
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+++ b/libgo/go/net/http/client.go
@@ -0,0 +1,304 @@
+// 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 client. See RFC 2616.
+// 
+// This is the high-level Client interface.
+// The low-level implementation is in transport.go.
+
+package http
+
+import (
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"io"
+	"net/url"
+	"strings"
+)
+
+// A Client is an HTTP client. Its zero value (DefaultClient) is a usable client
+// that uses DefaultTransport.
+//
+// The Client's Transport typically has internal state (cached
+// TCP connections), so Clients should be reused instead of created as
+// needed. Clients are safe for concurrent use by multiple goroutines.
+//
+// Client is not yet very configurable.
+type Client struct {
+	Transport RoundTripper // if nil, DefaultTransport is used
+
+	// If CheckRedirect is not nil, the client calls it before
+	// following an HTTP redirect. The arguments req and via
+	// are the upcoming request and the requests made already,
+	// oldest first. If CheckRedirect returns an error, the client
+	// returns that error instead of issue the Request req.
+	//
+	// If CheckRedirect is nil, the Client uses its default policy,
+	// which is to stop after 10 consecutive requests.
+	CheckRedirect func(req *Request, via []*Request) error
+}
+
+// DefaultClient is the default Client and is used by Get, Head, and Post.
+var DefaultClient = &Client{}
+
+// RoundTripper is an interface representing the ability to execute a
+// single HTTP transaction, obtaining the Response for a given Request.
+//
+// A RoundTripper must be safe for concurrent use by multiple
+// goroutines.
+type RoundTripper interface {
+	// RoundTrip executes a single HTTP transaction, returning
+	// the Response for the request req.  RoundTrip should not
+	// attempt to interpret the response.  In particular,
+	// RoundTrip must return err == nil if it obtained a response,
+	// regardless of the response's HTTP status code.  A non-nil
+	// err should be reserved for failure to obtain a response.
+	// Similarly, RoundTrip should not attempt to handle
+	// higher-level protocol details such as redirects,
+	// authentication, or cookies.
+	//
+	// RoundTrip should not modify the request, except for
+	// consuming the Body.  The request's URL and Header fields
+	// are guaranteed to be initialized.
+	RoundTrip(*Request) (*Response, error)
+}
+
+// Given a string of the form "host", "host:port", or "[ipv6::address]:port",
+// return true if the string includes a port.
+func hasPort(s string) bool { return strings.LastIndex(s, ":") > strings.LastIndex(s, "]") }
+
+// Used in Send to implement io.ReadCloser by bundling together the
+// bufio.Reader through which we read the response, and the underlying
+// network connection.
+type readClose struct {
+	io.Reader
+	io.Closer
+}
+
+// Do sends an HTTP request and returns an HTTP response, following
+// policy (e.g. redirects, cookies, auth) as configured on the client.
+//
+// A non-nil response always contains a non-nil resp.Body.
+//
+// Callers should close resp.Body when done reading from it. If
+// resp.Body is not closed, the Client's underlying RoundTripper
+// (typically Transport) may not be able to re-use a persistent TCP
+// connection to the server for a subsequent "keep-alive" request.
+//
+// Generally Get, Post, or PostForm will be used instead of Do.
+func (c *Client) Do(req *Request) (resp *Response, err error) {
+	if req.Method == "GET" || req.Method == "HEAD" {
+		return c.doFollowingRedirects(req)
+	}
+	return send(req, c.Transport)
+}
+
+// send issues an HTTP request.  Caller should close resp.Body when done reading from it.
+func send(req *Request, t RoundTripper) (resp *Response, err error) {
+	if t == nil {
+		t = DefaultTransport
+		if t == nil {
+			err = errors.New("http: no Client.Transport or DefaultTransport")
+			return
+		}
+	}
+
+	if req.URL == nil {
+		return nil, errors.New("http: nil Request.URL")
+	}
+
+	// Most the callers of send (Get, Post, et al) don't need
+	// Headers, leaving it uninitialized.  We guarantee to the
+	// Transport that this has been initialized, though.
+	if req.Header == nil {
+		req.Header = make(Header)
+	}
+
+	info := req.URL.RawUserinfo
+	if len(info) > 0 {
+		req.Header.Set("Authorization", "Basic "+base64.URLEncoding.EncodeToString([]byte(info)))
+	}
+	return t.RoundTrip(req)
+}
+
+// True if the specified HTTP status code is one for which the Get utility should
+// automatically redirect.
+func shouldRedirect(statusCode int) bool {
+	switch statusCode {
+	case StatusMovedPermanently, StatusFound, StatusSeeOther, StatusTemporaryRedirect:
+		return true
+	}
+	return false
+}
+
+// Get issues a GET to the specified URL.  If the response is one of the following
+// redirect codes, Get follows the redirect, up to a maximum of 10 redirects:
+//
+//    301 (Moved Permanently)
+//    302 (Found)
+//    303 (See Other)
+//    307 (Temporary Redirect)
+//
+// Caller should close r.Body when done reading from it.
+//
+// Get is a wrapper around DefaultClient.Get.
+func Get(url string) (r *Response, err error) {
+	return DefaultClient.Get(url)
+}
+
+// Get issues a GET to the specified URL.  If the response is one of the
+// following redirect codes, Get follows the redirect after calling the
+// Client's CheckRedirect function.
+//
+//    301 (Moved Permanently)
+//    302 (Found)
+//    303 (See Other)
+//    307 (Temporary Redirect)
+//
+// Caller should close r.Body when done reading from it.
+func (c *Client) Get(url string) (r *Response, err error) {
+	req, err := NewRequest("GET", url, nil)
+	if err != nil {
+		return nil, err
+	}
+	return c.doFollowingRedirects(req)
+}
+
+func (c *Client) doFollowingRedirects(ireq *Request) (r *Response, err error) {
+	// TODO: if/when we add cookie support, the redirected request shouldn't
+	// necessarily supply the same cookies as the original.
+	var base *url.URL
+	redirectChecker := c.CheckRedirect
+	if redirectChecker == nil {
+		redirectChecker = defaultCheckRedirect
+	}
+	var via []*Request
+
+	if ireq.URL == nil {
+		return nil, errors.New("http: nil Request.URL")
+	}
+
+	req := ireq
+	urlStr := "" // next relative or absolute URL to fetch (after first request)
+	for redirect := 0; ; redirect++ {
+		if redirect != 0 {
+			req = new(Request)
+			req.Method = ireq.Method
+			req.Header = make(Header)
+			req.URL, err = base.Parse(urlStr)
+			if err != nil {
+				break
+			}
+			if len(via) > 0 {
+				// Add the Referer header.
+				lastReq := via[len(via)-1]
+				if lastReq.URL.Scheme != "https" {
+					req.Header.Set("Referer", lastReq.URL.String())
+				}
+
+				err = redirectChecker(req, via)
+				if err != nil {
+					break
+				}
+			}
+		}
+
+		urlStr = req.URL.String()
+		if r, err = send(req, c.Transport); err != nil {
+			break
+		}
+		if shouldRedirect(r.StatusCode) {
+			r.Body.Close()
+			if urlStr = r.Header.Get("Location"); urlStr == "" {
+				err = errors.New(fmt.Sprintf("%d response missing Location header", r.StatusCode))
+				break
+			}
+			base = req.URL
+			via = append(via, req)
+			continue
+		}
+		return
+	}
+
+	method := ireq.Method
+	err = &url.Error{method[0:1] + strings.ToLower(method[1:]), urlStr, err}
+	return
+}
+
+func defaultCheckRedirect(req *Request, via []*Request) error {
+	if len(via) >= 10 {
+		return errors.New("stopped after 10 redirects")
+	}
+	return nil
+}
+
+// Post issues a POST to the specified URL.
+//
+// Caller should close r.Body when done reading from it.
+//
+// Post is a wrapper around DefaultClient.Post
+func Post(url string, bodyType string, body io.Reader) (r *Response, err error) {
+	return DefaultClient.Post(url, bodyType, body)
+}
+
+// Post issues a POST to the specified URL.
+//
+// Caller should close r.Body when done reading from it.
+func (c *Client) Post(url string, bodyType string, body io.Reader) (r *Response, err error) {
+	req, err := NewRequest("POST", url, body)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Content-Type", bodyType)
+	return send(req, c.Transport)
+}
+
+// PostForm issues a POST to the specified URL, 
+// with data's keys and values urlencoded as the request body.
+//
+// Caller should close r.Body when done reading from it.
+//
+// PostForm is a wrapper around DefaultClient.PostForm
+func PostForm(url string, data url.Values) (r *Response, err error) {
+	return DefaultClient.PostForm(url, data)
+}
+
+// PostForm issues a POST to the specified URL, 
+// with data's keys and values urlencoded as the request body.
+//
+// Caller should close r.Body when done reading from it.
+func (c *Client) PostForm(url string, data url.Values) (r *Response, err error) {
+	return c.Post(url, "application/x-www-form-urlencoded", strings.NewReader(data.Encode()))
+}
+
+// Head issues a HEAD to the specified URL.  If the response is one of the
+// following redirect codes, Head follows the redirect after calling the
+// Client's CheckRedirect function.
+//
+//    301 (Moved Permanently)
+//    302 (Found)
+//    303 (See Other)
+//    307 (Temporary Redirect)
+//
+// Head is a wrapper around DefaultClient.Head
+func Head(url string) (r *Response, err error) {
+	return DefaultClient.Head(url)
+}
+
+// Head issues a HEAD to the specified URL.  If the response is one of the
+// following redirect codes, Head follows the redirect after calling the
+// Client's CheckRedirect function.
+//
+//    301 (Moved Permanently)
+//    302 (Found)
+//    303 (See Other)
+//    307 (Temporary Redirect)
+func (c *Client) Head(url string) (r *Response, err error) {
+	req, err := NewRequest("HEAD", url, nil)
+	if err != nil {
+		return nil, err
+	}
+	return c.doFollowingRedirects(req)
+}