ходим на сайты в интернете

go.mod

@@ -1,3 +1,11 @@
 module git.3crabs.ru/VLADIMIR/net
 
 go 1.20
+
+require github.com/stretchr/testify v1.8.4
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -0,0 +1,9 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

http/client.go

@@ -2,15 +2,22 @@ package http
 
 import (
 	"bufio"
+	"crypto/tls"
 	"errors"
 	"fmt"
 	"io"
-	"net"
 	"strconv"
 	"strings"
 )
 
-func Do(method string, url string) (*Response, error) {
+var (
+	CRLF = []byte("\r\n")
+	SP   = []byte(" ")
+)
+
+func Do(method string, url string, headers []*Header) (*Response, error) {
+	url = strings.TrimPrefix(url, "http://")
+	url = strings.TrimPrefix(url, "https://")
 	path := "/"
 	arr := strings.Split(url, "/")
 	if len(arr) == 2 {
@@ -20,56 +27,93 @@ func Do(method string, url string) (*Response, error) {
 		path = "/" + path
 	}
 
-	conn, err := net.Dial("tcp", arr[0])
+	connectPath := arr[0]
+	// conn, err := net.Dial("tcp", connectPath)
+	conn, err := tls.Dial("tcp", connectPath, nil)
 	if err != nil {
-		return nil, errors.New("connect " + arr[0])
+		return nil, errors.New("connect " + connectPath)
 	}
 	defer conn.Close()
 
-	WriteRequest(conn, method, path, "HTTP/1.0")
+	WriteRequest(conn, method, arr[0], path, "HTTP/1.0", headers)
 	return ReadResponse(conn)
 }
 
-func WriteRequest(w io.Writer, method string, path string, httpVersion string) {
-	fmt.Fprintf(w, "%s %s %s\r\n\r\n", method, path, httpVersion)
+func WriteRequest(
+	w io.Writer,
+	method string,
+	host string,
+	path string,
+	httpVersion string,
+	headers []*Header,
+) {
+	io.WriteString(w, method)
+	w.Write(SP)
+	io.WriteString(w, path)
+	w.Write(SP)
+	io.WriteString(w, httpVersion)
+	w.Write(CRLF)
+
+	for _, header := range headers {
+		WriteHeader(w, header.Name, header.Value)
+	}
+
+	// headers end
+	w.Write(CRLF)
+
+	// todo: body
+}
+
+func WriteHeader(w io.Writer, name string, value string) {
+	fmt.Fprintf(w, "%s:%s", name, value)
+	w.Write(CRLF)
 }
 
 func ReadResponse(r io.Reader) (*Response, error) {
-	response := &Response{}
-
 	b := bufio.NewReader(r)
 
-	status, err := b.ReadString('\n')
-	if err != nil {
-		return response, errors.New("read status")
+	if _, err := b.ReadString(' '); err != nil {
+		return nil, errors.New("read httpVersion")
 	}
-	arr := strings.Split(status, " ")
-	response.StatusCode, err = strconv.Atoi(arr[1])
+	statusCodeStr, err := b.ReadString(' ')
 	if err != nil {
-		return response, errors.New("read status code")
+		return nil, errors.New("read statusCode")
+	}
+	if _, err := b.ReadString('\r'); err != nil {
+		return nil, errors.New("read statusName")
+	}
+	if _, err := b.ReadString('\n'); err != nil {
+		return nil, errors.New("read LF")
+	}
+
+	statusCode, err := strconv.Atoi(statusCodeStr[:len(statusCodeStr)-1])
+	if err != nil {
+		return nil, errors.New("read statusCode")
 	}
 
 	headerStr := ""
+	contentLengthStr := ""
+	headers := []*Header{}
 	for {
 		headerStr, err = b.ReadString('\n')
 		if err != nil {
-			return response, errors.New("read header")
+			return nil, errors.New("read header")
 		}
 		if headerStr == "\r\n" {
 			break
 		}
 		arr := strings.Split(headerStr, ": ")
 		value := strings.TrimSpace(arr[1])
-		response.Headers = append(response.Headers, &Header{Name: arr[0], Value: value})
+		header := &Header{Name: arr[0], Value: value}
+		if header.Name == "Content-Length" {
+			contentLengthStr = header.Value
+		}
+		headers = append(headers, header)
 	}
 
-	contentTypeHeader, err := response.GetHeader("Content-Length")
+	length, err := strconv.Atoi(contentLengthStr)
 	if err != nil {
-		return response, errors.New("get Content-Length")
-	}
-	length, err := strconv.Atoi(contentTypeHeader.Value)
-	if err != nil {
-		return response, errors.New("read Content-Length")
+		return nil, errors.New("read Content-Length")
 	}
 
 	body := make([]byte, 0, length)
@@ -77,11 +121,14 @@ func ReadResponse(r io.Reader) (*Response, error) {
 	for i := 0; i < length; i++ {
 		r, err := b.ReadByte()
 		if err != nil {
-			return response, errors.New("read body")
+			return nil, errors.New("read body")
 		}
 		body = append(body, r)
 	}
-	response.Body = body
 
-	return response, nil
+	return &Response{
+		StatusCode: statusCode,
+		Headers:    headers,
+		Body:       body,
+	}, nil
 }

http/client_test.go

@@ -0,0 +1,39 @@
+package http
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_WriteRequest(t *testing.T) {
+	b := &strings.Builder{}
+
+	WriteRequest(b, "GET", "example.ru", "/", "HTTP/1.0", nil)
+
+	assert.Equal(t, "GET / HTTP/1.0\r\n\r\n", b.String())
+}
+
+func Test_ReadResponse(t *testing.T) {
+	b := bytes.NewBuffer(
+		[]byte("HTTP/1.1 200 OK\r\nDate: Sat, 03 Feb 2024 16:40:29 GMT\r\nContent-Length: 12\r\nContent-Type: text/plain; charset=utf-8\r\n\r\nHello World!"),
+	)
+
+	r, err := ReadResponse(b)
+	assert.Nil(t, err)
+
+	assert.Equal(t, 200, r.StatusCode)
+
+	assert.Equal(t, "Date", r.Headers[0].Name)
+	assert.Equal(t, "Sat, 03 Feb 2024 16:40:29 GMT", r.Headers[0].Value)
+
+	assert.Equal(t, "Content-Length", r.Headers[1].Name)
+	assert.Equal(t, "12", r.Headers[1].Value)
+
+	assert.Equal(t, "Content-Type", r.Headers[2].Name)
+	assert.Equal(t, "text/plain; charset=utf-8", r.Headers[2].Value)
+
+	assert.Equal(t, []byte("Hello World!"), r.Body)
+}

test_client/main.go

@@ -7,9 +7,21 @@ import (
 )
 
 func main() {
-	r, err := http.Do("GET", "127.0.0.1:8081")
+	r, err := http.Do(
+		"GET",
+		"https://3crabs.ru:443",
+		[]*http.Header{
+			{Name: "Host", Value: "3crabs.ru"},
+			{Name: "User-Agent", Value: "3crabs/0.0.1"},
+			{Name: "Accept", Value: "*/*"},
+		},
+	)
 	if err != nil {
 		panic(err)
 	}
-	fmt.Println(r.StatusCode, string(r.Body))
+	fmt.Println(r.StatusCode)
+	for _, header := range r.Headers {
+		fmt.Println(header)
+	}
+	fmt.Println(string(r.Body))
 }

test_server/main.go

@@ -7,6 +7,7 @@ import (
 
 func main() {
 	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		fmt.Println(r.Header)
 		fmt.Fprintf(w, "Hello World!")
 		w.WriteHeader(200)
 	})