docs: add parameter descriptions and enhanced test coverage

Signed-off-by: weidongkl <[email protected]>

Author: weidongkl

README.md

@@ -213,7 +213,8 @@ scrape_configs:
 | max-distinct-key-groups             | REDIS_EXPORTER_MAX_DISTINCT_KEY_GROUPS           | Maximum number of distinct key groups that can be tracked independently *per Redis database*. If exceeded, only key groups with the highest memory consumption within the limit will be tracked separately, all remaining key groups will be tracked under a single `overflow` key group.                                                                                                                                                                                                                                                                                                                                                       |
 | config-command                      | REDIS_EXPORTER_CONFIG_COMMAND                    | What to use for the CONFIG command, defaults to `CONFIG`, , set to "-" to skip config metrics extraction.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
 | basic-auth-username                 | REDIS_EXPORTER_BASIC_AUTH_USERNAME               | Username for Basic Authentication with the redis exporter needs to be set together with basic-auth-password to be effective
-| basic-auth-password                 | REDIS_EXPORTER_BASIC_AUTH_PASSWORD               | Password for Basic Authentication with the redis exporter needs to be set together with basic-auth-username to be effective
+| basic-auth-password                 | REDIS_EXPORTER_BASIC_AUTH_PASSWORD               | Password for Basic Authentication with the redis exporter needs to be set together with basic-auth-username to be effective, conflicts with `basic-auth-hash-password`.
+| basic-auth-hash-password            | REDIS_EXPORTER_BASIC_AUTH_HASH_PASSWORD          | Bcrypt-hashed password for Basic Authentication with the redis exporter needs to be set together with basic-auth-username to be effective,  conflicts with `basic-auth-password`. 
 | include-metrics-for-empty-databases | REDIS_EXPORTER_INCL_METRICS_FOR_EMPTY_DATABASES  | Whether to emit db metrics (like db_keys) for empty databases
 
 Redis instance addresses can be tcp addresses: `redis://localhost:6379`, `redis.example.com:6379` or e.g. unix sockets: `unix:///tmp/redis.sock`.\

exporter/http_test.go

@@ -597,12 +597,13 @@ func TestBasicAuth(t *testing.T) {
 	}
 
 	tests := []struct {
-		name           string
-		username       string
-		password       string
-		configUsername string
-		configPassword string
-		wantStatusCode int
+		name               string
+		username           string
+		password           string
+		configUsername     string
+		configPassword     string
+		configHashPassword string
+		wantStatusCode     int
 	}{
 		{
 			name:           "No auth configured - no credentials provided",
@@ -644,6 +645,38 @@ func TestBasicAuth(t *testing.T) {
 			configPassword: "testpass",
 			wantStatusCode: http.StatusUnauthorized,
 		},
+		{
+			name:               "Auth configured with hash password - correct credentials",
+			username:           "testuser",
+			password:           "testpass",
+			configUsername:     "testuser",
+			configHashPassword: "$2a$12$ODSJd0tmxY7H/adgD7R5SO43d8nmhUsa8OM6Weo7VFs3MbrsEY7tu",
+			wantStatusCode:     http.StatusOK,
+		},
+		{
+			name:               "Auth configured with hash password - wrong password",
+			username:           "testuser",
+			password:           "wrongpass",
+			configUsername:     "testuser",
+			configHashPassword: "$2a$12$ODSJd0tmxY7H/adgD7R5SO43d8nmhUsa8OM6Weo7VFs3MbrsEY7tu",
+			wantStatusCode:     http.StatusUnauthorized,
+		},
+		{
+			name:               "Auth configured with hash password - wrong username",
+			username:           "wronguser",
+			password:           "testpass",
+			configUsername:     "testuser",
+			configHashPassword: "$2a$12$ODSJd0tmxY7H/adgD7R5SO43d8nmhUsa8OM6Weo7VFs3MbrsEY7tu",
+			wantStatusCode:     http.StatusUnauthorized,
+		},
+		{
+			name:               "Auth configured with hash password - no credentials provided",
+			username:           "",
+			password:           "",
+			configUsername:     "testuser",
+			configHashPassword: "$2a$12$ODSJd0tmxY7H/adgD7R5SO43d8nmhUsa8OM6Weo7VFs3MbrsEY7tu",
+			wantStatusCode:     http.StatusUnauthorized,
+		},
 	}
 
 	for _, tt := range tests {