Pull request 1908: AG-23497-scripts-download-languages

Squashed commit of the following:

commit 874e847fc9bbfaeb8af1c02eb0ba1dbb98bd008f
Merge: 4becdd809 a79deda66
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Wed Jul 12 16:01:45 2023 +0300

    Merge branch 'master' into AG-23497-scripts-download-languages

commit 4becdd8092558b15d783674f5b9d1e9c151e3a8c
Merge: 1e5385c33 40884624c
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Wed Jul 12 13:34:34 2023 +0300

    Merge branch 'master' into AG-23497-scripts-download-languages

commit 1e5385c33a298b0b8563fee6704f6bb3ded12d60
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Tue Jul 11 19:56:29 2023 +0300

    all: upd golibs, imp code

commit 0498960b00be21b1294f8b71108b234554e5847f
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Fri Jul 7 19:05:58 2023 +0300

    scripts: imp naming

commit 6e36ed83c6bec2fe6159442a9e6805c0720e27f5
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Thu Jul 6 16:37:13 2023 +0300

    scripts: separate files

commit 55027cfa1c04b0a36e5267b024b53a45f26dd974
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Wed Jul 5 13:51:40 2023 +0300

    scripts: add download languages

scripts/translations/upload.go

@@ -0,0 +1,120 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"mime/multipart"
+	"net/http"
+	"net/textproto"
+	"os"
+	"path/filepath"
+
+	"github.com/AdguardTeam/AdGuardHome/internal/aghhttp"
+	"github.com/AdguardTeam/golibs/errors"
+	"github.com/AdguardTeam/golibs/httphdr"
+	"github.com/AdguardTeam/golibs/mapsutil"
+)
+
+// upload base translation.
+func (c *twoskyClient) upload() (err error) {
+	defer func() { err = errors.Annotate(err, "upload: %w") }()
+
+	uploadURI := c.uri.JoinPath("upload")
+	basePath := filepath.Join(localesDir, defaultBaseFile)
+
+	formData := map[string]string{
+		"format":   "json",
+		"language": string(c.baseLang),
+		"filename": defaultBaseFile,
+		"project":  c.projectID,
+	}
+
+	buf, cType, err := prepareMultipartMsg(formData, basePath)
+	if err != nil {
+		return fmt.Errorf("preparing multipart msg: %w", err)
+	}
+
+	err = send(uploadURI.String(), cType, buf)
+	if err != nil {
+		return fmt.Errorf("sending multipart msg: %w", err)
+	}
+
+	return nil
+}
+
+// prepareMultipartMsg prepares translation data for upload.
+func prepareMultipartMsg(
+	formData map[string]string,
+	basePath string,
+) (buf *bytes.Buffer, cType string, err error) {
+	buf = &bytes.Buffer{}
+	w := multipart.NewWriter(buf)
+	var fw io.Writer
+
+	err = mapsutil.OrderedRangeError(formData, w.WriteField)
+	if err != nil {
+		return nil, "", fmt.Errorf("writing field: %w", err)
+	}
+
+	file, err := os.Open(basePath)
+	if err != nil {
+		return nil, "", fmt.Errorf("opening file: %w", err)
+	}
+
+	defer func() {
+		err = errors.WithDeferred(err, file.Close())
+	}()
+
+	h := make(textproto.MIMEHeader)
+	h.Set(httphdr.ContentType, aghhttp.HdrValApplicationJSON)
+
+	d := fmt.Sprintf("form-data; name=%q; filename=%q", "file", defaultBaseFile)
+	h.Set(httphdr.ContentDisposition, d)
+
+	fw, err = w.CreatePart(h)
+	if err != nil {
+		return nil, "", fmt.Errorf("creating part: %w", err)
+	}
+
+	_, err = io.Copy(fw, file)
+	if err != nil {
+		return nil, "", fmt.Errorf("copying: %w", err)
+	}
+
+	err = w.Close()
+	if err != nil {
+		return nil, "", fmt.Errorf("closing writer: %w", err)
+	}
+
+	return buf, w.FormDataContentType(), nil
+}
+
+// send POST request to uriStr.
+func send(uriStr, cType string, buf *bytes.Buffer) (err error) {
+	client := http.Client{
+		Timeout: uploadTimeout,
+	}
+
+	req, err := http.NewRequest(http.MethodPost, uriStr, buf)
+	if err != nil {
+		return fmt.Errorf("bad request: %w", err)
+	}
+
+	req.Header.Set(httphdr.ContentType, cType)
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return fmt.Errorf("client post form: %w", err)
+	}
+
+	defer func() {
+		err = errors.WithDeferred(err, resp.Body.Close())
+	}()
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("status code is not ok: %q", http.StatusText(resp.StatusCode))
+	}
+
+	return nil
+}