Move gitea api calls in own "client" package (#78)

continue #75
close #16
- fix regression (from #34) _thanks to @crystal_
- create own gitea client package
- more logging
- add mock impl of CertDB

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: crystal <crystal@noreply.codeberg.org>
Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/78
Reviewed-by: crapStone <crapstone@noreply.codeberg.org>

server/gitea/client.go

@@ -0,0 +1,119 @@
+package gitea
+
+import (
+	"errors"
+	"fmt"
+	"net/url"
+	"path"
+	"time"
+
+	"github.com/valyala/fasthttp"
+	"github.com/valyala/fastjson"
+)
+
+const giteaAPIRepos = "/api/v1/repos/"
+
+var ErrorNotFound = errors.New("not found")
+
+type Client struct {
+	giteaRoot      string
+	giteaAPIToken  string
+	fastClient     *fasthttp.Client
+	infoTimeout    time.Duration
+	contentTimeout time.Duration
+}
+
+type FileResponse struct {
+	Exists   bool
+	MimeType string
+	Body     []byte
+}
+
+func joinURL(giteaRoot string, paths ...string) string { return giteaRoot + path.Join(paths...) }
+
+func (f FileResponse) IsEmpty() bool { return len(f.Body) != 0 }
+
+func NewClient(giteaRoot, giteaAPIToken string) *Client {
+	return &Client{
+		giteaRoot:      giteaRoot,
+		giteaAPIToken:  giteaAPIToken,
+		infoTimeout:    5 * time.Second,
+		contentTimeout: 10 * time.Second,
+		fastClient:     getFastHTTPClient(),
+	}
+}
+
+func (client *Client) GiteaRawContent(targetOwner, targetRepo, ref, resource string) ([]byte, error) {
+	url := joinURL(client.giteaRoot, giteaAPIRepos, targetOwner, targetRepo, "raw", resource+"?ref="+url.QueryEscape(ref))
+	res, err := client.do(client.contentTimeout, url)
+	if err != nil {
+		return nil, err
+	}
+
+	switch res.StatusCode() {
+	case fasthttp.StatusOK:
+		return res.Body(), nil
+	case fasthttp.StatusNotFound:
+		return nil, ErrorNotFound
+	default:
+		return nil, fmt.Errorf("unexpected status code '%d'", res.StatusCode())
+	}
+}
+
+func (client *Client) ServeRawContent(uri string) (*fasthttp.Response, error) {
+	url := joinURL(client.giteaRoot, giteaAPIRepos, uri)
+	res, err := client.do(client.contentTimeout, url)
+	if err != nil {
+		return nil, err
+	}
+	// resp.SetBodyStream(&strings.Reader{}, -1)
+
+	if err != nil {
+		return nil, err
+	}
+
+	switch res.StatusCode() {
+	case fasthttp.StatusOK:
+		return res, nil
+	case fasthttp.StatusNotFound:
+		return nil, ErrorNotFound
+	default:
+		return nil, fmt.Errorf("unexpected status code '%d'", res.StatusCode())
+	}
+}
+
+func (client *Client) GiteaGetRepoBranchTimestamp(repoOwner, repoName, branchName string) (time.Time, error) {
+	url := joinURL(client.giteaRoot, giteaAPIRepos, repoOwner, repoName, "branches", branchName)
+	res, err := client.do(client.infoTimeout, url)
+	if err != nil {
+		return time.Time{}, err
+	}
+	if res.StatusCode() != fasthttp.StatusOK {
+		return time.Time{}, fmt.Errorf("unexpected status code '%d'", res.StatusCode())
+	}
+	return time.Parse(time.RFC3339, fastjson.GetString(res.Body(), "commit", "timestamp"))
+}
+
+func (client *Client) GiteaGetRepoDefaultBranch(repoOwner, repoName string) (string, error) {
+	url := joinURL(client.giteaRoot, giteaAPIRepos, repoOwner, repoName)
+	res, err := client.do(client.infoTimeout, url)
+	if err != nil {
+		return "", err
+	}
+	if res.StatusCode() != fasthttp.StatusOK {
+		return "", fmt.Errorf("unexpected status code '%d'", res.StatusCode())
+	}
+	return fastjson.GetString(res.Body(), "default_branch"), nil
+}
+
+func (client *Client) do(timeout time.Duration, url string) (*fasthttp.Response, error) {
+	req := fasthttp.AcquireRequest()
+
+	req.SetRequestURI(url)
+	req.Header.Set(fasthttp.HeaderAuthorization, "token "+client.giteaAPIToken)
+	res := fasthttp.AcquireResponse()
+
+	err := client.fastClient.DoTimeout(req, res, timeout)
+
+	return res, err
+}