Add plugin framework and settings UI

server/src/services/plugin-config-validator.ts

@@ -0,0 +1,50 @@
+/**
+ * @fileoverview Validates plugin instance configuration against its JSON Schema.
+ *
+ * Uses Ajv to validate `configJson` values against the `instanceConfigSchema`
+ * declared in a plugin's manifest. This ensures that invalid configuration is
+ * rejected at the API boundary, not discovered later at worker startup.
+ *
+ * @module server/services/plugin-config-validator
+ */
+
+import Ajv, { type ErrorObject } from "ajv";
+import addFormats from "ajv-formats";
+import type { JsonSchema } from "@paperclipai/shared";
+
+export interface ConfigValidationResult {
+  valid: boolean;
+  errors?: { field: string; message: string }[];
+}
+
+/**
+ * Validate a config object against a JSON Schema.
+ *
+ * @param configJson - The configuration values to validate.
+ * @param schema - The JSON Schema from the plugin manifest's `instanceConfigSchema`.
+ * @returns Validation result with structured field errors on failure.
+ */
+export function validateInstanceConfig(
+  configJson: Record<string, unknown>,
+  schema: JsonSchema,
+): ConfigValidationResult {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const AjvCtor = (Ajv as any).default ?? Ajv;
+  const ajv = new AjvCtor({ allErrors: true });
+  // ajv-formats v3 default export is a FormatsPlugin object; call it as a plugin.
+  const applyFormats = (addFormats as any).default ?? addFormats;
+  applyFormats(ajv);
+  const validate = ajv.compile(schema);
+  const valid = validate(configJson);
+
+  if (valid) {
+    return { valid: true };
+  }
+
+  const errors = (validate.errors ?? []).map((err: ErrorObject) => ({
+    field: err.instancePath || "/",
+    message: err.message ?? "validation failed",
+  }));
+
+  return { valid: false, errors };
+}