working commit

pkg/client/client.go

@@ -1,9 +1,103 @@
 package client
 
-type Client struct {
+import (
+	"context"
+	"crypto/tls"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+)
+
+type Client struct{}
+
+func NewClient() *Client {
+	return &Client{}
 }
 
-func (cli *Client) FileExists(path string) (bool, error) {
-	//reqPath = fmt.Sprintf("/v3/api/file/%s", path)
-	//request, err := http.NewRequest("HEAD", reqPath, nil)
+func (cli *Client) FileExists(ctx context.Context, reference string) (bool, error) {
+	var res bool
+	var err error
+
+	reqpath := fmt.Sprintf("/v3/api/file/%s", reference)
+
+	req, err := http.NewRequestWithContext(ctx, "HEAD", reqpath, nil)
+	if err != nil {
+		return res, err
+	}
+	transport := &http.Transport{
+		TLSClientConfig: &tls.Config{
+			InsecureSkipVerify: true,
+		},
+	}
+	client := &http.Client{
+		Transport: transport,
+	}
+	resp, err := client.Do(req)
+	if err != nil {
+		return res, err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode == http.StatusOK {
+		res = true
+	}
+	return res, err
+}
+
+func (cli *Client) GetFile(ctx context.Context, ref, filename string) error {
+	var err error
+
+	const api = "/v3/api/file/"
+
+	if !strings.Contains(ref, "://") {
+		ref = "https://" + ref
+	}
+	url, err := url.Parse(ref)
+	if err != nil {
+		return err
+	}
+	url.Path = path.Join(api, url.Path)
+	url.User = nil
+	ref = url.String()
+
+	req, err := http.NewRequestWithContext(ctx, "GET", ref, nil)
+	if err != nil {
+		return err
+	}
+	transport := &http.Transport{
+		TLSClientConfig: &tls.Config{
+			InsecureSkipVerify: true,
+		},
+	}
+	client := &http.Client{
+		Transport: transport,
+	}
+	resp, err := client.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		err := fmt.Errorf("Received wrong status code: %s", resp.StatusCode)
+		return err
+	}
+
+	dirname := filepath.Dir(filename)
+	err = os.MkdirAll(dirname, 0750)
+	if err != nil {
+		return err
+	}
+	file, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE, 0640)
+	if err != nil {
+		return err
+	}
+	_, err = io.Copy(file, resp.Body)
+	if err != nil {
+		return err
+	}
+	return err
 }