Native forgejo support (#3684)

Co-authored-by: Robert Kaussow <xoxys@rknet.org>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>

server/forge/forgejo/parse.go

@@ -0,0 +1,139 @@
+// Copyright 2024 Woodpecker Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package forgejo
+
+import (
+	"io"
+	"net/http"
+	"strings"
+
+	"github.com/rs/zerolog/log"
+
+	"go.woodpecker-ci.org/woodpecker/v2/server/forge/types"
+	"go.woodpecker-ci.org/woodpecker/v2/server/model"
+)
+
+const (
+	hookEvent       = "X-Forgejo-Event"
+	hookPush        = "push"
+	hookCreated     = "create"
+	hookPullRequest = "pull_request"
+	hookRelease     = "release"
+
+	actionOpen  = "opened"
+	actionSync  = "synchronized"
+	actionClose = "closed"
+
+	refBranch = "branch"
+	refTag    = "tag"
+)
+
+// parseHook parses a Forgejo hook from an http.Request and returns
+// Repo and Pipeline detail. If a hook type is unsupported nil values are returned.
+func parseHook(r *http.Request) (*model.Repo, *model.Pipeline, error) {
+	hookType := r.Header.Get(hookEvent)
+	switch hookType {
+	case hookPush:
+		return parsePushHook(r.Body)
+	case hookCreated:
+		return parseCreatedHook(r.Body)
+	case hookPullRequest:
+		return parsePullRequestHook(r.Body)
+	case hookRelease:
+		return parseReleaseHook(r.Body)
+	}
+	log.Debug().Msgf("unsupported hook type: '%s'", hookType)
+	return nil, nil, &types.ErrIgnoreEvent{Event: hookType}
+}
+
+// parsePushHook parses a push hook and returns the Repo and Pipeline details.
+// If the commit type is unsupported nil values are returned.
+func parsePushHook(payload io.Reader) (repo *model.Repo, pipeline *model.Pipeline, err error) {
+	push, err := parsePush(payload)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// ignore push events for tags
+	if strings.HasPrefix(push.Ref, "refs/tags/") {
+		return nil, nil, nil
+	}
+
+	// TODO is this even needed?
+	if push.RefType == refBranch {
+		return nil, nil, nil
+	}
+
+	repo = toRepo(push.Repo)
+	pipeline = pipelineFromPush(push)
+	return repo, pipeline, err
+}
+
+// parseCreatedHook parses a push hook and returns the Repo and Pipeline details.
+// If the commit type is unsupported nil values are returned.
+func parseCreatedHook(payload io.Reader) (repo *model.Repo, pipeline *model.Pipeline, err error) {
+	push, err := parsePush(payload)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	if push.RefType != refTag {
+		return nil, nil, nil
+	}
+
+	repo = toRepo(push.Repo)
+	pipeline = pipelineFromTag(push)
+	return repo, pipeline, nil
+}
+
+// parsePullRequestHook parses a pull_request hook and returns the Repo and Pipeline details.
+func parsePullRequestHook(payload io.Reader) (*model.Repo, *model.Pipeline, error) {
+	var (
+		repo     *model.Repo
+		pipeline *model.Pipeline
+	)
+
+	pr, err := parsePullRequest(payload)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// Don't trigger pipelines for non-code changes ...
+	if pr.Action != actionOpen && pr.Action != actionSync && pr.Action != actionClose {
+		log.Debug().Msgf("pull_request action is '%s' and no open or sync", pr.Action)
+		return nil, nil, nil
+	}
+
+	repo = toRepo(pr.Repo)
+	pipeline = pipelineFromPullRequest(pr)
+	return repo, pipeline, err
+}
+
+// parseReleaseHook parses a release hook and returns the Repo and Pipeline details.
+func parseReleaseHook(payload io.Reader) (*model.Repo, *model.Pipeline, error) {
+	var (
+		repo     *model.Repo
+		pipeline *model.Pipeline
+	)
+
+	release, err := parseRelease(payload)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	repo = toRepo(release.Repo)
+	pipeline = pipelineFromRelease(release)
+	return repo, pipeline, err
+}