Make HTTP basic auth configurable for scrape targets.

config/config.go

@@ -182,6 +182,8 @@ type DefaultedScrapeConfig struct {
 	MetricsPath string `yaml:"metrics_path,omitempty"`
 	// The URL scheme with which to fetch metrics from targets.
 	Scheme string `yaml:"scheme,omitempty"`
+	// The HTTP basic authentication credentials for the targets.
+	BasicAuth *BasicAuth `yaml:"basic_auth"`
 
 	// List of labeled target groups for this job.
 	TargetGroups []*TargetGroup `yaml:"target_groups,omitempty"`
@@ -191,7 +193,13 @@ type DefaultedScrapeConfig struct {
 	RelabelConfigs []*RelabelConfig `yaml:"relabel_configs,omitempty"`
 }
 
-// A labeled group of targets to scrape for a job.
+// BasicAuth contains basic HTTP authentication credentials.
+type BasicAuth struct {
+	Username string `yaml:"username"`
+	Password string `yaml:"password"`
+}
+
+// TargetGroup is a set of targets with a common label set.
 type TargetGroup struct {
 	// Targets is a list of targets identified by a label set. Each target is
 	// uniquely identifiable in the group by its address label.

config/config_test.go

@@ -69,8 +69,12 @@ var expectedConf = &Config{DefaultedConfig{
 			ScrapeInterval: Duration(50 * time.Second),
 			ScrapeTimeout:  Duration(5 * time.Second),
 
+			BasicAuth: &BasicAuth{
+				Username: "admin",
+				Password: "password",
+			},
 			MetricsPath: "/my_path",
-			Scheme:      "http",
+			Scheme:      "https",
 
 			DNSSDConfigs: []*DNSSDConfig{
 				{DefaultedDNSSDConfig{

config/testdata/conf.good.yml

@@ -40,11 +40,15 @@ scrape_configs:
 
   - job_name: service-x
 
+    basic_auth:
+      username: admin
+      password: password
+
     scrape_interval: 50s
     scrape_timeout:  5s
 
     metrics_path: /my_path
-    # scheme defaults to 'http'.
+    scheme: https
 
     dns_sd_configs:
       - refresh_interval: 15s

retrieval/target.go

@@ -192,6 +192,9 @@ func (t *target) Update(cfg *config.ScrapeConfig, baseLabels clientmodel.LabelSe
 
 	t.url.Scheme = cfg.Scheme
 	t.url.Path = string(baseLabels[clientmodel.MetricsPathLabel])
+	if cfg.BasicAuth != nil {
+		t.url.User = url.UserPassword(cfg.BasicAuth.Username, cfg.BasicAuth.Password)
+	}
 
 	t.scrapeInterval = time.Duration(cfg.ScrapeInterval)
 	t.deadline = time.Duration(cfg.ScrapeTimeout)