1 files changed, 93 insertions, 0 deletions
diff --git a/services/services.go b/services/services.go
new file mode 100644
index 0000000..b9e5693
--- /dev/null
+++ b/services/services.go
@@ -0,0 +1,93 @@
+package services
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+	"os"
+)
+
+var (
+	ServiceList []Service
+	FallbackMap map[string]string
+)
+
+const (
+	baseRepoLink = "https://git.sr.ht/~benbusby/farside/blob/main/"
+
+	noCFServicesJSON = "services.json"
+	fullServicesJSON = "services-full.json"
+)
+
+type Service struct {
+	Type      string   `json:"type"`
+	TestURL   string   `json:"test_url,omitempty"`
+	Fallback  string   `json:"fallback,omimtempty"`
+	Instances []string `json:"instances"`
+}
+
+func ingestServicesList(servicesBytes []byte) error {
+	err := json.Unmarshal(servicesBytes, &ServiceList)
+	return err
+}
+
+func GetServicesFileName() string {
+	cloudflareEnabled := false
+
+	cfEnabledVar := os.Getenv("FARSIDE_CF_ENABLED")
+	if len(cfEnabledVar) > 0 && cfEnabledVar == "1" {
+		cloudflareEnabled = true
+	}
+
+	serviceJSON := noCFServicesJSON
+	if cloudflareEnabled {
+		serviceJSON = fullServicesJSON
+	}
+
+	return serviceJSON
+}
+
+
+func FetchServicesFile(serviceJSON string) ([]byte, error) {
+	resp, err := http.Get(baseRepoLink + serviceJSON)
+	if err != nil {
+		return nil, err
+	}
+
+	defer resp.Body.Close()
+
+	bodyBytes, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	err = os.WriteFile(serviceJSON, bodyBytes, 0666)
+	if err != nil {
+		return nil, err
+	}
+
+	return bodyBytes, nil
+}
+
+func InitializeServices() error {
+	serviceJSON := GetServicesFileName()
+	fileBytes, err := os.ReadFile(serviceJSON)
+	if err != nil {
+		fileBytes, err = FetchServicesFile(serviceJSON)
+		if err != nil {
+			return err
+		}
+	}
+
+	err = ingestServicesList(fileBytes)
+	if err != nil {
+		return err
+	}
+
+	FallbackMap = make(map[string]string)
+	for _, serviceElement := range ServiceList {
+		FallbackMap[serviceElement.Type] = serviceElement.Fallback
+	}
+
+	return nil
+}