[v24.1.x] [CORE-60] Schema Registry: Support /mode

src/v/pandaproxy/api/api-doc/schema_registry.json

@@ -185,17 +185,210 @@
           "application/json"
         ],
         "parameters": [],
-        "produces": ["application/vnd.schemaregistry.v1+json"],
+        "produces": [
+          "application/vnd.schemaregistry.v1+json",
+          "application/vnd.schemaregistry+json",
+          "application/json"
+        ],
         "responses": {
           "200": {
             "description": "OK",
             "schema": {
-              "type": "object",
-              "properties": {
-                "mode": {
-                  "type": "string"
-                }
-              }
+              "$ref": "#/definitions/mode"
+            }
+          },
+          "500": {
+            "description": "Internal Server error",
+            "schema": {
+              "$ref": "#/definitions/error_body"
+            }
+          }
+        }
+      },
+      "put": {
+        "summary": "Set the global mode.",
+        "operationId": "put_mode",
+        "consumes": [
+          "application/vnd.schemaregistry.v1+json",
+          "application/vnd.schemaregistry+json",
+          "application/json"
+        ],
+        "parameters": [
+          {
+            "name": "mode",
+            "in": "body",
+            "schema": {
+              "$ref": "#/definitions/mode"
+            }
+          }
+        ],
+        "produces": [
+          "application/vnd.schemaregistry.v1+json",
+          "application/vnd.schemaregistry+json",
+          "application/json"
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "schema": {
+              "$ref": "#/definitions/mode"
+            }
+          },
+          "422": {
+            "description": "Unprocessable Entity",
+            "schema": {
+              "$ref": "#/definitions/error_body"
+            }
+          },
+          "500": {
+            "description": "Internal Server error",
+            "schema": {
+              "$ref": "#/definitions/error_body"
+            }
+          }
+        }
+      }
+    },
+    "/mode/{subject}": {
+      "get": {
+        "summary": "Get the mode for a subject.",
+        "operationId": "get_mode_subject",
+        "consumes": [
+          "application/vnd.schemaregistry.v1+json",
+          "application/vnd.schemaregistry+json",
+          "application/json"
+        ],
+        "parameters": [
+          {
+            "name": "subject",
+            "description": "The subject to get the mode for.",
+            "in": "path",
+            "required": true,
+            "type": "string"
+          },
+          {
+            "name": "defaultToGlobal",
+            "description": "If true, return the global mode if the subject doesn't have a mode set.",
+            "in": "query",
+            "required": false,
+            "type": "boolean"
+          }
+        ],
+        "produces": [
+          "application/vnd.schemaregistry.v1+json",
+          "application/vnd.schemaregistry+json",
+          "application/json"
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "schema": {
+              "$ref": "#/definitions/mode"
+            }
+          },
+          "404": {
+            "description": "Not Found",
+            "schema": {
+              "$ref": "#/definitions/error_body"
+            }
+          },
+          "500": {
+            "description": "Internal Server error",
+            "schema": {
+              "$ref": "#/definitions/error_body"
+            }
+          }
+        }
+      },
+      "put": {
+        "summary": "Set the mode for a subject.",
+        "operationId": "put_mode_subject",
+        "consumes": [
+          "application/vnd.schemaregistry.v1+json",
+          "application/vnd.schemaregistry+json",
+          "application/json"
+        ],
+        "parameters": [
+          {
+            "name": "subject",
+            "description": "The subject to set the mode for.",
+            "in": "path",
+            "required": true,
+            "type": "string"
+          },
+          {
+            "name": "mode",
+            "in": "body",
+            "schema": {
+              "$ref": "#/definitions/mode"
+            }
+          }
+        ],
+        "produces": [
+          "application/vnd.schemaregistry.v1+json",
+          "application/vnd.schemaregistry+json",
+          "application/json"
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "schema": {
+              "$ref": "#/definitions/mode"
+            }
+          },
+          "404": {
+            "description": "Not Found",
+            "schema": {
+              "$ref": "#/definitions/error_body"
+            }
+          },
+          "422": {
+            "description": "Unprocessable Entity",
+            "schema": {
+              "$ref": "#/definitions/error_body"
+            }
+          },
+          "500": {
+            "description": "Internal Server error",
+            "schema": {
+              "$ref": "#/definitions/error_body"
+            }
+          }
+        }
+      },
+      "delete": {
+        "summary": "Delete the mode for a subject.",
+        "operationId": "delete_mode_subject",
+        "consumes": [
+          "application/vnd.schemaregistry.v1+json",
+          "application/vnd.schemaregistry+json",
+          "application/json"
+        ],
+        "parameters": [
+          {
+            "name": "subject",
+            "description": "The subject to delete the mode for.",
+            "in": "path",
+            "required": true,
+            "type": "string"
+          }
+        ],
+        "produces": [
+          "application/vnd.schemaregistry.v1+json",
+          "application/vnd.schemaregistry+json",
+          "application/json"
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "schema": {
+              "$ref": "#/definitions/mode"
+            }
+          },
+          "404": {
+            "description": "Not Found",
+            "schema": {
+              "$ref": "#/definitions/error_body"
             }
           },
           "500": {
@@ -423,7 +616,7 @@
     },
     "/subjects/{subject}": {
       "post": {
-        "summary": "Check if a schema is already registred for the subject.",
+        "summary": "Check if a schema is already registered for the subject.",
         "operationId": "post_subject",
         "consumes": [
           "application/vnd.schemaregistry.v1+json",

src/v/pandaproxy/api/api-doc/schema_registry_definitions.def.json

@@ -89,5 +89,17 @@
           "compatibility": {
             "type": "string"
           }
+        }
+      },
+      "mode": {
+      "type": "object",
+      "properties": {
+        "mode": {
+          "type": "string",
+          "enum": [
+            "READWRITE",
+            "READONLY"
+          ]
+        },
       }
     }

src/v/pandaproxy/api/api-doc/schema_registry_header.json

@@ -2,7 +2,7 @@
   "swagger": "2.0",
   "info": {
     "title": "Pandaproxy Schema Registry",
-    "version": "1.0.3"
+    "version": "1.0.4"
   },
   "host": "{{Host}}",
   "basePath": "/",

src/v/pandaproxy/auth_utils.h

@@ -39,4 +39,47 @@ inline credential_t maybe_authenticate_request(
 
     return user;
 }
+
+enum class auth_level {
+    // Unauthenticated endpoint (not a typo, 'public' is a keyword)
+    publik = 0,
+    // Requires authentication (if enabled) but not superuser status
+    user = 1,
+    // Requires authentication (if enabled) and superuser status
+    superuser = 2
+};
+
+inline credential_t maybe_authorize_request(
+  config::rest_authn_method authn_method,
+  auth_level lvl,
+  request_authenticator& authenticator,
+  const ss::http::request& req) {
+    credential_t user;
+
+    if (authn_method != config::rest_authn_method::none) {
+        // Will throw 400 & 401 if auth fails
+        auto auth_result = authenticator.authenticate(req);
+        // Will throw 403 if user enabled HTTP Basic Auth but
+        // did not give the authorization header.
+        switch (lvl) {
+        case auth_level::superuser:
+            auth_result.require_superuser();
+            break;
+        case auth_level::user:
+            auth_result.require_authenticated();
+            break;
+        case auth_level::publik:
+            auth_result.pass();
+            break;
+        }
+
+        user = credential_t{
+          auth_result.get_username(),
+          auth_result.get_password(),
+          auth_result.get_sasl_mechanism()};
+    }
+
+    return user;
+}
+
 } // namespace pandaproxy

src/v/pandaproxy/error.cc

@@ -129,6 +129,8 @@ struct reply_error_category final : std::error_category {
             return "subject_version_not_deleted";
         case reply_error_code::compatibility_not_found:
             return "compatibility_not_found";
+        case reply_error_code::mode_not_found:
+            return "mode_not_found";
         case reply_error_code::serialization_error:
             return "serialization_error";
         case reply_error_code::consumer_already_exists:
@@ -140,6 +142,8 @@ struct reply_error_category final : std::error_category {
             return "Invalid schema version";
         case reply_error_code::compatibility_level_invalid:
             return "Invalid compatibility level";
+        case reply_error_code::mode_invalid:
+            return "Invalid mode";
         case reply_error_code::subject_version_operaton_not_permitted:
             return "Overwrite new schema is not permitted.";
         case reply_error_code::subject_version_has_references:

src/v/pandaproxy/error.h

@@ -78,11 +78,13 @@ enum class reply_error_code : uint16_t {
     subject_version_soft_deleted = 40406,
     subject_version_not_deleted = 40407,
     compatibility_not_found = 40408,
+    mode_not_found = 40409,
     serialization_error = 40801,
     consumer_already_exists = 40902,
     schema_empty = 42201,
     schema_version_invalid = 42202,
     compatibility_level_invalid = 42203,
+    mode_invalid = 42204,
     subject_version_operaton_not_permitted = 42205,
     subject_version_has_references = 42206,
     subject_version_schema_id_already_exists = 42207,

src/v/pandaproxy/schema_registry/api.cc

@@ -45,7 +45,7 @@ api::~api() noexcept = default;
 
 ss::future<> api::start() {
     _store = std::make_unique<sharded_store>();
-    co_await _store->start(_sg);
+    co_await _store->start(is_mutable(_cfg.mode_mutability), _sg);
     co_await _schema_id_validation_probe.start();
     co_await _schema_id_validation_probe.invoke_on_all(
       &schema_id_validation_probe::setup_metrics);

src/v/pandaproxy/schema_registry/configuration.cc

@@ -32,6 +32,7 @@ configuration::configuration()
       {},
       {},
       config::endpoint_tls_config::validate_many)
+  , mode_mutability(*this, "mode_mutability", "Allow modifying mode", {}, false)
   , schema_registry_replication_factor(
       *this,
       "schema_registry_replication_factor",

src/v/pandaproxy/schema_registry/configuration.h

@@ -26,6 +26,7 @@ struct configuration final : public config::config_store {
       schema_registry_api;
     config::one_or_many_property<config::endpoint_tls_config>
       schema_registry_api_tls;
+    config::property<bool> mode_mutability;
     config::property<std::optional<int16_t>> schema_registry_replication_factor;
     config::property<ss::sstring> api_doc_dir;
 };

src/v/pandaproxy/schema_registry/error.cc

@@ -53,6 +53,8 @@ struct error_category final : std::error_category {
         case error_code::compatibility_not_found:
             return "Subject does not have subject-level compatibility "
                    "configured";
+        case error_code::mode_not_found:
+            return "Subject does not have subject-level mode configured";
         case error_code::subject_version_operaton_not_permitted:
             return "Overwrite new schema is not permitted.";
         case error_code::subject_version_has_references:
@@ -69,6 +71,8 @@ struct error_category final : std::error_category {
             return "Invalid compatibility level. Valid values are NONE, "
                    "BACKWARD, FORWARD, FULL, BACKWARD_TRANSITIVE, "
                    "FORWARD_TRANSITIVE, and FULL_TRANSITIVE";
+        case error_code::mode_invalid:
+            return "Invalid mode. Valid values are READWRITE, READONLY";
         }
         return "(unrecognized error)";
     }
@@ -93,6 +97,8 @@ struct error_category final : std::error_category {
             return reply_error_code::subject_version_not_deleted; // 40407
         case error_code::compatibility_not_found:
             return reply_error_code::compatibility_not_found; // 40408
+        case error_code::mode_not_found:
+            return reply_error_code::mode_not_found; // 40409
         case error_code::subject_schema_invalid:
             return reply_error_code::internal_server_error; // 500
         case error_code::write_collision:
@@ -117,6 +123,8 @@ struct error_category final : std::error_category {
             return reply_error_code::zookeeper_error; // 50001
         case error_code::compatibility_level_invalid:
             return reply_error_code::compatibility_level_invalid; // 42203
+        case error_code::mode_invalid:
+            return reply_error_code::mode_invalid; // 42204
         }
         return {};
     }