refactor actions to improve testability

actions/action.go

@@ -0,0 +1,80 @@
+package actions
+
+import (
+	"fmt"
+	"net/http"
+	"net/url"
+	"os"
+	"path/filepath"
+	"regexp"
+
+	"github.com/nektos/act/common"
+	log "github.com/sirupsen/logrus"
+)
+
+// imageURL is the directory where a `Dockerfile` should exist
+func parseImageLocal(workingDir string, contextDir string) (contextDirOut string, tag string, ok bool) {
+	if !filepath.IsAbs(contextDir) {
+		contextDir = filepath.Join(workingDir, contextDir)
+	}
+	if _, err := os.Stat(filepath.Join(contextDir, "Dockerfile")); os.IsNotExist(err) {
+		log.Debugf("Ignoring missing Dockerfile '%s/Dockerfile'", contextDir)
+		return "", "", false
+	}
+
+	sha, _, err := common.FindGitRevision(contextDir)
+	if err != nil {
+		log.Warnf("Unable to determine git revision: %v", err)
+		sha = "latest"
+	}
+	return contextDir, fmt.Sprintf("%s:%s", filepath.Base(contextDir), sha), true
+}
+
+// imageURL is the URL for a docker repo
+func parseImageReference(image string) (ref string, ok bool) {
+	imageURL, err := url.Parse(image)
+	if err != nil {
+		log.Debugf("Unable to parse image as url: %v", err)
+		return "", false
+	}
+	if imageURL.Scheme != "docker" {
+		log.Debugf("Ignoring non-docker ref '%s'", imageURL.String())
+		return "", false
+	}
+
+	return fmt.Sprintf("%s%s", imageURL.Host, imageURL.Path), true
+}
+
+// imageURL is the directory where a `Dockerfile` should exist
+func parseImageGithub(image string) (cloneURL *url.URL, ref string, path string, ok bool) {
+	re := regexp.MustCompile("^([^/@]+)/([^/@]+)(/([^@]*))?(@(.*))?$")
+	matches := re.FindStringSubmatch(image)
+
+	if matches == nil {
+		return nil, "", "", false
+	}
+
+	cloneURL, err := url.Parse(fmt.Sprintf("https://github.com/%s/%s", matches[1], matches[2]))
+	if err != nil {
+		log.Debugf("Unable to parse as URL: %v", err)
+		return nil, "", "", false
+	}
+
+	resp, err := http.Head(cloneURL.String())
+	if resp.StatusCode >= 400 || err != nil {
+		log.Debugf("Unable to HEAD URL %s status=%v err=%v", cloneURL.String(), resp.StatusCode, err)
+		return nil, "", "", false
+	}
+
+	ref = matches[6]
+	if ref == "" {
+		ref = "master"
+	}
+
+	path = matches[4]
+	if path == "" {
+		path = "."
+	}
+
+	return cloneURL, ref, path, true
+}