E2E List cmd and added API calls (#3)

* Completed List cmd and added API calls

* Minor comments and add delete code to pass linting

* Typo in descriptions

* Minor comments

* Validations

* Validations-1

* improved branch flag validation

* removed build

* Minor comments and Readme

cmd/client.go

@@ -0,0 +1,88 @@
+package cmd
+
+import (
+	"fmt"
+	"log"
+	"net/url"
+
+	gh "github.com/cli/go-gh"
+	"github.com/cli/go-gh/pkg/api"
+	ghRepo "github.com/cli/go-gh/pkg/repository"
+)
+
+type cacheInfo struct {
+	Key            string
+	Ref            string
+	LastAccessedAt string
+	Size           float64
+}
+
+func getCacheUsage(repo ghRepo.Repository) float64 {
+	client, err := getRestClient(repo)
+	if err != nil {
+		log.Fatal(err)
+	}
+	pathComponent := fmt.Sprintf("repos/%s/%s/actions/cache/usage", repo.Owner(), repo.Name())
+	var apiResults map[string]interface{}
+	err = client.Get(pathComponent, &apiResults)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	cacheSizeResult := apiResults["active_caches_size_in_bytes"].(float64)
+	return cacheSizeResult
+}
+
+func listCaches(repo ghRepo.Repository, queryParams url.Values) []cacheInfo {
+	client, err := getRestClient(repo)
+	if err != nil {
+		log.Fatal(err)
+	}
+	pathComponent := fmt.Sprintf("repos/%s/%s/actions/caches", repo.Owner(), repo.Name())
+	var apiResults map[string]interface{}
+	err = client.Get(pathComponent+"?"+queryParams.Encode(), &apiResults)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	actionsCachesResult := apiResults["actions_caches"].([]interface{})
+
+	var caches []cacheInfo
+	for _, item := range actionsCachesResult {
+		caches = append(caches, cacheInfo{
+			Key:            item.(map[string]interface{})["key"].(string),
+			Ref:            item.(map[string]interface{})["ref"].(string),
+			LastAccessedAt: item.(map[string]interface{})["last_accessed_at"].(string),
+			Size:           item.(map[string]interface{})["size_in_bytes"].(float64),
+		})
+	}
+	return caches
+}
+
+func deleteCaches(repo ghRepo.Repository, queryParams url.Values) float64 {
+	client, err := getRestClient(repo)
+	if err != nil {
+		log.Fatal(err)
+	}
+	pathComponent := fmt.Sprintf("repos/%s/%s/actions/caches", repo.Owner(), repo.Name())
+	var apiResults map[string]interface{}
+	err = client.Delete(pathComponent+"?"+queryParams.Encode(), &apiResults)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	totalDeletedCachesResult := apiResults["total_count"].(float64)
+	return totalDeletedCachesResult
+}
+
+func getRestClient(repo ghRepo.Repository) (api.RESTClient, error) {
+	opts := api.ClientOptions{
+		Host:    repo.Host(),
+		Headers: map[string]string{"User-Agent": fmt.Sprintf("gh-actions-cache/%s/%s", VERSION, COMMAND) },
+	}
+	client, err := gh.RESTClient(&opts)
+	if err != nil {
+		return nil, err
+	}
+	return client, nil
+}