refactor (2) (#34)

move forward with refactoring:
 - initial implementation of a smal "gitea client for fasthttp"
 - move constant into const.go

Co-authored-by: 6543 <6543@obermui.de>
Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/34
Reviewed-by: Otto Richter <otto@codeberg.org>

server/upstream/gitea.go

@@ -0,0 +1,67 @@
+package upstream
+
+import (
+	"fmt"
+	"net/url"
+	"path"
+	"time"
+
+	"github.com/valyala/fasthttp"
+	"github.com/valyala/fastjson"
+)
+
+const giteaAPIRepos = "/api/v1/repos/"
+
+// TODOs:
+// * own client to store token & giteaRoot
+// * handle 404 -> page will show 500 atm
+
+func giteaRawContent(targetOwner, targetRepo, ref, giteaRoot, giteaAPIToken, resource string) ([]byte, error) {
+	req := fasthttp.AcquireRequest()
+
+	req.SetRequestURI(path.Join(giteaRoot, giteaAPIRepos, targetOwner, targetRepo, "raw", resource+"?ref="+url.QueryEscape(ref)))
+	req.Header.Set(fasthttp.HeaderAuthorization, giteaAPIToken)
+	res := fasthttp.AcquireResponse()
+
+	if err := getFastHTTPClient(10*time.Second).Do(req, res); err != nil {
+		return nil, err
+	}
+	if res.StatusCode() != fasthttp.StatusOK {
+		return nil, fmt.Errorf("unexpected status code '%d'", res.StatusCode())
+	}
+	return res.Body(), nil
+}
+
+func giteaGetRepoBranchTimestamp(giteaRoot, repoOwner, repoName, branchName, giteaAPIToken string) (time.Time, error) {
+	client := getFastHTTPClient(5 * time.Second)
+
+	req := fasthttp.AcquireRequest()
+	req.SetRequestURI(path.Join(giteaRoot, giteaAPIRepos, repoOwner, repoName, "branches", branchName))
+	req.Header.Set(fasthttp.HeaderAuthorization, giteaAPIToken)
+	res := fasthttp.AcquireResponse()
+
+	if err := client.Do(req, res); 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 giteaGetRepoDefaultBranch(giteaRoot, repoOwner, repoName, giteaAPIToken string) (string, error) {
+	client := getFastHTTPClient(5 * time.Second)
+
+	req := fasthttp.AcquireRequest()
+	req.SetRequestURI(path.Join(giteaRoot, giteaAPIRepos, repoOwner, repoName))
+	req.Header.Set(fasthttp.HeaderAuthorization, giteaAPIToken)
+	res := fasthttp.AcquireResponse()
+
+	if err := client.Do(req, res); 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
+}