add ocis.yaml

ocis-pkg/config/config.go

@@ -1,6 +1,10 @@
 package config
 
 import (
+	"fmt"
+	"reflect"
+
+	gofig "github.com/gookit/config/v2"
 	accounts "github.com/owncloud/ocis/accounts/pkg/config"
 	glauth "github.com/owncloud/ocis/glauth/pkg/config"
 	graphExplorer "github.com/owncloud/ocis/graph-explorer/pkg/config"
@@ -124,3 +128,78 @@ func New() *Config {
 		WebDAV:        webdav.New(),
 	}
 }
+
+// TODO(refs) refactoir refactor this outside
+type mapping struct {
+	EnvVars     []string    // name of the EnvVars var.
+	Destination interface{} // memory address of the original config value to modify.
+}
+
+// GetEnv fetches a list of known env variables for this extension. It is to be used by gookit, as it provides a list
+// with all the environment variables an extension supports.
+func GetEnv() []string {
+	var r = make([]string, len(structMappings(&Config{})))
+	for i := range structMappings(&Config{}) {
+		r = append(r, structMappings(&Config{})[i].EnvVars...)
+	}
+
+	return r
+}
+
+// UnmapEnv loads values from the gooconf.Config argument and sets them in the expected destination.
+// TODO(refs) can we avoid repetition here?
+func (c *Config) UnmapEnv(gooconf *gofig.Config) error {
+	vals := structMappings(c)
+	for i := range vals {
+		for j := range vals[i].EnvVars {
+			// we need to guard against v != "" because this is the condition that checks that the value is set from the environment.
+			// the `ok` guard is not enough, apparently.
+			if v, ok := gooconf.GetValue(vals[i].EnvVars[j]); ok && v != "" {
+
+				// get the destination type from destination
+				switch reflect.ValueOf(vals[i].Destination).Type().String() {
+				case "*bool":
+					r := gooconf.Bool(vals[i].EnvVars[j])
+					*vals[i].Destination.(*bool) = r
+				case "*string":
+					r := gooconf.String(vals[i].EnvVars[j])
+					*vals[i].Destination.(*string) = r
+				case "*int":
+					r := gooconf.Int(vals[i].EnvVars[j])
+					*vals[i].Destination.(*int) = r
+				case "*float64":
+					// defaults to float64
+					r := gooconf.Float(vals[i].EnvVars[j])
+					*vals[i].Destination.(*float64) = r
+				default:
+					// it is unlikely we will ever get here. Let this serve more as a runtime check for when debugging.
+					return fmt.Errorf("invalid type for env var: `%v`", vals[i].EnvVars[j])
+				}
+			}
+		}
+	}
+
+	return nil
+}
+
+// structMappings binds a set of environment variables to a destination on cfg.
+func structMappings(cfg *Config) []mapping {
+	return []mapping{
+		{
+			EnvVars:     []string{"OCIS_LOG_FILE"},
+			Destination: &cfg.Log.Level,
+		},
+		{
+			EnvVars:     []string{"OCIS_LOG_LEVEL"},
+			Destination: &cfg.Log.Level,
+		},
+		{
+			EnvVars:     []string{"OCIS_LOG_COLOR"},
+			Destination: &cfg.Log.Color,
+		},
+		{
+			EnvVars:     []string{"OCIS_LOG_PRETTY"},
+			Destination: &cfg.Log.Pretty,
+		},
+	}
+}

ocis-pkg/config/helpers.go

@@ -67,7 +67,7 @@ func sanitizeExtensions(set []string, ext []string, f func(a, b string) bool) []
 // is to solely modify `dst`, not dealing with the config structs; and do so in a thread safe manner.
 func BindSourcesToStructs(extension string, dst interface{}) (*gofig.Config, error) {
 	sources := DefaultConfigSources(extension, supportedExtensions)
-	cnf := gofig.NewWithOptions("proxy", gofig.ParseEnv)
+	cnf := gofig.NewWithOptions(extension, gofig.ParseEnv)
 	cnf.AddDriver(gooyaml.Driver)
 	_ = cnf.LoadFiles(sources...)