Add additional validation to swarming v1 distributor.

dm/api/distributor/swarming/v1/normalize.go

Index: dm/api/distributor/swarming/v1/normalize.go
diff --git a/dm/api/distributor/swarming/v1/normalize.go b/dm/api/distributor/swarming/v1/normalize.go
index b72e2cecd9a271773effdb74bdc023379b64dfdc..f1bef718a92507775b4375a49fe69ff9d90bbf11 100644
--- a/dm/api/distributor/swarming/v1/normalize.go
+++ b/dm/api/distributor/swarming/v1/normalize.go
@@ -7,6 +7,9 @@ package swarmingV1
 import (
 	"errors"
 	"fmt"
+	"net/url"
+	"strings"
+	"unicode"
 )
 
 // DefaultSwarmingPriority is the priority used if
@@ -77,5 +80,65 @@ func (i *Parameters_Job_Inputs) Normalize() (err error) {
 		return errors.New(
 			"job.inputs: at least one of packages and isolated must be specified")
 	}
+	if len(i.Packages) > 0 {
+		if err = schemaHostURLValidate(i.CipdServer); err != nil {
+			return fmt.Errorf("job.inputs.cipd_server: %s", err)
+		}
+		for i, p := range i.Packages {
+			if p.Name == "" {
+				return fmt.Errorf("job.inputs.packages[%d]: missing name", i)
+			}
+			if p.Version == "" {
+				return fmt.Errorf("job.inputs.packages[%d]: missing version", i)
+			}
+		}
+	}
+	return
+}
+
+func schemaHostURLValidate(uStr string) error {
+	if uStr == "" {
+		return errors.New("required")
+	}
+	if strings.IndexFunc(uStr, unicode.IsUpper) != -1 {
+		return errors.New("must be lower-case")
+	}
+	u, err := url.Parse(uStr)
+	if err != nil {
+		return fmt.Errorf("invalid url: %s", err)
+	}
+	if u.Scheme != "http" && u.Scheme != "https" {
+		return fmt.Errorf("unsupported scheme: %s", u.Scheme)
+	}
+	if fmt.Sprintf("%s://%s", u.Scheme, u.Host) != uStr {
+		return fmt.Errorf("unsupported url: %s", uStr)
+	}
+	return nil
+}
+
+// Normalize normalizes and checks for input violations.
+func (c *Config) Normalize() (err error) {
+	if err = c.Swarming.Normalize(); err != nil {
+		return
+	}
+	if err = c.Isolate.Normalize(); err != nil {
+		return
+	}
+	return
+}
+
+// Normalize normalizes and checks for input violations.
+func (s *Config_Swarming) Normalize() (err error) {
+	if err = schemaHostURLValidate(s.Url); err != nil {
+		return fmt.Errorf("config.swarming.host: %s", err)
+	}
+	return
+}
+
+// Normalize normalizes and checks for input violations.
+func (i *Config_Isolate) Normalize() (err error) {
+	if err = schemaHostURLValidate(i.Url); err != nil {
+		return fmt.Errorf("config.isolate.host: %s", err)
+	}
 	return
 }