Refactor validation handling in apiMethods: Introduce strongly-typed ValidationException and ViolationFromMap. Replace generic validation logic with stricter, type-safe mappings. Update makeFetch to handle Symfony validation problems with enhanced error taxonomy.

src/Bundle/ChillMainBundle/Resources/public/lib/api/apiMethods.ts

@@ -2,7 +2,7 @@ import { Scope } from "../../types";
 
 export type body = Record<string, boolean | string | number | null>;
 export type fetchOption = Record<string, boolean | string | number | null>;
-
+export type Primitive = string | number | boolean | null;
 export type Params = Record<string, number | string>;
 
 export interface Pagination {
@@ -25,20 +25,128 @@ export interface TransportExceptionInterface {
   name: string;
 }
 
-export interface ValidationExceptionInterface
+// Strict : uniquement les clés déclarées dans M[K]
-  extends TransportExceptionInterface {
+export type ViolationFromMap<
+  M extends Record<string, Record<string, unknown>>,
+> = {
+  [K in Extract<keyof M, string>]: {
+    propertyPath: K;
+    title: string;
+    parameters?: M[K]; // ← uniquement ces clés (pas d’extras)
+    type?: string;
+  };
+}[Extract<keyof M, string>];
+
+export type ValidationProblemFromMap<
+  M extends Record<string, Record<string, unknown>>,
+> = {
+  type: string;
+  title: string;
+  detail?: string;
+  violations: ViolationFromMap<M>[];
+} & Record<string, unknown>;
+
+export interface ValidationExceptionInterface<
+  M extends Record<string, Record<string, unknown>> = Record<
+    string,
+    Record<string, unknown>
+  >,
+> extends Error {
   name: "ValidationException";
-  error: object;
+  /** Copie du payload serveur (utile pour logs/diagnostic) */
+  problem: ValidationProblemFromMap<M>;
+  /** Liste compacte "Titre: chemin" */
   violations: string[];
+  /** Uniquement les titres */
   titles: string[];
-  propertyPaths: string[];
+  /** Uniquement les chemins de propriété */
+  propertyPaths: Extract<keyof M, string>[];
+  /** Indexation par propriété (utile pour afficher par champ) */
+  byProperty: Record<Extract<keyof M, string>, string[]>;
 }
 
-export interface ValidationErrorResponse extends TransportExceptionInterface {
+export class ValidationException<
-  violations: {
+    M extends Record<string, Record<string, unknown>> = Record<
-    title: string;
+      string,
-    propertyPath: string;
+      Record<string, unknown>
-  }[];
+    >,
+  >
+  extends Error
+  implements ValidationExceptionInterface<M>
+{
+  public readonly name = "ValidationException" as const;
+  public readonly problem: ValidationProblemFromMap<M>;
+  public readonly violations: string[];
+  public readonly titles: string[];
+  public readonly propertyPaths: Extract<keyof M, string>[];
+  public readonly byProperty: Record<Extract<keyof M, string>, string[]>;
+
+  constructor(problem: ValidationProblemFromMap<M>) {
+    const message = [problem.title, problem.detail].filter(Boolean).join(" — ");
+    super(message);
+    Object.setPrototypeOf(this, new.target.prototype);
+
+    this.problem = problem;
+
+    this.violations = problem.violations.map(
+      (v) => `${v.title}: ${v.propertyPath}`,
+    );
+
+    this.titles = problem.violations.map((v) => v.title);
+
+    this.propertyPaths = problem.violations.map(
+      (v) => v.propertyPath,
+    ) as Extract<keyof M, string>[];
+
+    this.byProperty = problem.violations.reduce(
+      (acc, v) => {
+        const key = v.propertyPath as Extract<keyof M, string>;
+        (acc[key] ||= []).push(v.title);
+        return acc;
+      },
+      {} as Record<Extract<keyof M, string>, string[]>,
+    );
+
+    if (Error.captureStackTrace) {
+      Error.captureStackTrace(this, ValidationException);
+    }
+  }
+}
+
+/**
+ * Check that the exception is a ValidationExceptionInterface
+ * @param x
+ */
+export function isValidationException(
+  x: unknown,
+): x is ValidationExceptionInterface<Record<string, Record<string, unknown>>> {
+  return (
+    x instanceof ValidationException ||
+    (typeof x === "object" &&
+      x !== null &&
+      (x as any).name === "ValidationException")
+  );
+}
+
+export function isValidationProblem(x: unknown): x is {
+  type: string;
+  title: string;
+  violations: { propertyPath: string; title: string }[];
+} {
+  if (!x || typeof x !== "object") return false;
+  const o = x as any;
+  return (
+    typeof o.type === "string" &&
+    typeof o.title === "string" &&
+    Array.isArray(o.violations) &&
+    o.violations.every(
+      (v: any) =>
+        v &&
+        typeof v === "object" &&
+        typeof v.propertyPath === "string" &&
+        typeof v.title === "string",
+    )
+  );
 }
 
 export interface AccessExceptionInterface extends TransportExceptionInterface {
@@ -65,12 +173,151 @@ export interface ConflictHttpExceptionInterface
 }
 
 /**
- * Generic api method that can be adapted to any fetch request
+ * Generic api method that can be adapted to any fetch request.
  *
- * This method is suitable make a single fetch. When performing a GET to fetch a list of elements, always consider pagination
+ * What this does
- * and use of the @link{fetchResults} method.
+ * - Performs a single HTTP request using fetch and returns the parsed JSON as Output.
+ * - Interprets common API errors and throws typed exceptions you can catch in your UI.
+ * - When the server returns a Symfony validation problem (HTTP 422), the error is
+ *   rethrown as a typed ValidationException that is aware of your Violation Map (see below).
+ *
+ * Important: For GET endpoints that return lists, prefer using fetchResults, which
+ * handles pagination and aggregation for you.
+ *
+ * Violation Map (M): make your 422 errors strongly typed
+ * ------------------------------------------------------
+ * Symfony’s validation problem+json payload looks like this (simplified):
+ *
+ *   {
+ *     "type": "https://symfony.com/errors/validation",
+ *     "title": "Validation Failed",
+ *     "violations": [
+ *       {
+ *         "propertyPath": "mobilenumber",
+ *         "title": "This value is not a valid phone number.",
+ *         "parameters": {
+ *           "{{ value }}": "+33 1 02 03 04 05",
+ *           "{{ types }}": "mobile number"
+ *         },
+ *         "type": "urn:uuid:..."
+ *       }
+ *     ]
+ *   }
+ *
+ * The makeFetch generic type parameter M lets you describe, field by field, which
+ * parameters may appear for each propertyPath. Doing so gives you full type-safety when
+ * consuming ValidationException in your UI code.
+ *
+ * How to build M (Violation Map)
+ * - M is a map where each key is a server-side propertyPath (string), and the value is a
+ *   record describing the allowed keys in the parameters object for that property.
+ * - Keys in parameters are the exact strings you receive from Symfony, including the
+ *   curly-braced placeholders such as "{{ value }}", "{{ types }}", etc.
+ *
+ * Example from Person creation (WritePersonViolationMap)
+ * -----------------------------------------------------
+ * In ChillPersonBundle/Resources/public/vuejs/_api/OnTheFly.ts you’ll find:
+ *
+ *   export type WritePersonViolationMap = {
+ *     gender: {
+ *       "{{ value }}": string | null;
+ *     };
+ *     mobilenumber: {
+ *       "{{ types }}": string;          // ex: "mobile number"
+ *       "{{ value }}": string;          // ex: "+33 1 02 03 04 05"
+ *     };
+ *   };
+ *
+ * This means:
+ * - If the server reports a violation for propertyPath "gender", the parameters object
+ *   is expected to contain a key "{{ value }}" with a string or null value.
+ * - If the server reports a violation for propertyPath "mobilenumber", the parameters
+ *   may include "{{ value }}" and "{{ types }}" as strings.
+ *
+ * How makeFetch uses M
+ * - When the response has status 422 and the payload matches a Symfony validation
+ *   problem, makeFetch casts it to ValidationProblemFromMap<M> and throws a
+ *   ValidationException<M>.
+ * - The ValidationException exposes helpful, pre-computed fields:
+ *   - exception.problem: the full typed payload
+ *   - exception.violations: ["Title: propertyPath", ...]
+ *   - exception.titles: ["Title 1", "Title 2", ...]
+ *   - exception.propertyPaths: ["gender", "mobilenumber", ...] (typed from M)
+ *   - exception.byProperty: { gender: [titles...], mobilenumber: [titles...] }
+ *
+ * Typical usage patterns
+ * ----------------------
+ * 1) GET without Validation Map (no 422 expected):
+ *
+ *   const centers = await makeFetch<null, { showCenters: boolean; centers: Center[] }>(
+ *     "GET",
+ *     "/api/1.0/person/creation/authorized-centers",
+ *     null
+ *   );
+ *
+ * 2) POST with body and Violation Map:
+ *
+ *   type WritePersonViolationMap = {
+ *     gender: { "{{ value }}": string | null };
+ *     mobilenumber: { "{{ types }}": string; "{{ value }}": string };
+ *   };
+ *
+ *   try {
+ *     const created = await makeFetch<PersonWrite, Person, WritePersonViolationMap>(
+ *       "POST",
+ *       "/api/1.0/person/person.json",
+ *       personPayload
+ *     );
+ *     // Success path
+ *   } catch (e) {
+ *     if (isValidationException(e)) {
+ *       // Fully typed:
+ *       e.propertyPaths.includes("mobilenumber");
+ *       const firstTitleForMobile = e.byProperty.mobilenumber?.[0];
+ *       // You can also inspect parameter values:
+ *       const v = e.problem.violations.find(v => v.propertyPath === "mobilenumber");
+ *       const rawValue = v?.parameters?.["{{ value }}"]; // typed as string
+ *     } else {
+ *       // Other error handling (AccessException, ConflictHttpException, etc.)
+ *     }
+ *   }
+ *
+ * Tips to design your Violation Map
+ * - Use exact propertyPath strings as exposed by the API (they usually match your
+ *   DTO field names or entity property paths used by the validator).
+ * - Inside each property, list only the placeholders that you actually read in the UI
+ *   (you can always add more later). This keeps your types strict but pragmatic.
+ * - If a field may not include parameters at all, you can set it to an empty object {}.
+ * - If you don’t care about parameter typing, you can omit M entirely and rely on the
+ *   default loose typing (Record<string, Primitive>), but you’ll lose safety.
+ *
+ * Error taxonomy thrown by makeFetch
+ * - ValidationException<M> when status = 422 and payload is a validation problem.
+ * - AccessException when status = 403.
+ * - ConflictHttpException when status = 409.
+ * - A generic error object for other non-ok statuses.
+ *
+ * @typeParam Input  - Shape of the request body you send (if any)
+ * @typeParam Output - Shape of the successful JSON response you expect
+ * @typeParam M      - Violation Map describing the per-field parameters you expect
+ *                     in Symfony validation violations. See examples above.
+ *
+ * @param method  The HTTP method to use (POST, GET, PUT, PATCH, DELETE)
+ * @param url     The absolute or relative URL to call
+ * @param body    The request payload. If null/undefined, no body is sent
+ * @param options Extra fetch options/headers merged into the request
+ *
+ * @returns The parsed JSON response typed as Output. For 204 No Content, resolves
+ *          with undefined (void).
  */
-export const makeFetch = <Input, Output>(
+export const makeFetch = async <
+  Input,
+  Output,
+  M extends Record<string, Record<string, unknown>> = Record<
+    string,
+    Record<string, Primitive>
+  >,
+>(
   method: "POST" | "GET" | "PUT" | "PATCH" | "DELETE",
   url: string,
   body?: body | Input | null,
@@ -90,7 +337,8 @@ export const makeFetch = <Input, Output>(
   if (typeof options !== "undefined") {
     opts = Object.assign(opts, options);
   }
-  return fetch(url, opts).then((response) => {
+
+  return fetch(url, opts).then(async (response) => {
     if (response.status === 204) {
       return Promise.resolve();
     }
@@ -100,9 +348,20 @@ export const makeFetch = <Input, Output>(
     }
 
     if (response.status === 422) {
-      return response.json().then((response) => {
+      // Unprocessable Entity -> payload de validation Symfony
-        throw ValidationException(response);
+      const json = await response.json().catch(() => undefined);
-      });
+
+      if (isValidationProblem(json)) {
+        // On ré-interprète le payload selon M (ParamMap) pour typer les violations
+        const problem = json as unknown as ValidationProblemFromMap<M>;
+        throw new ValidationException<M>(problem);
+      }
+
+      const err = new Error(
+        "Validation failed but payload is not a ValidationProblem",
+      );
+      (err as any).raw = json;
+      throw err;
     }
 
     if (response.status === 403) {
@@ -167,12 +426,6 @@ function _fetchAction<T>(
         throw NotFoundException(response);
       }
 
-      if (response.status === 422) {
-        return response.json().then((response) => {
-          throw ValidationException(response);
-        });
-      }
-
       if (response.status === 403) {
         throw AccessException(response);
       }
@@ -231,24 +484,6 @@ export const fetchScopes = (): Promise<Scope[]> => {
   return fetchResults("/api/1.0/main/scope.json");
 };
 
-/**
- * Error objects to be thrown
- */
-const ValidationException = (
-  response: ValidationErrorResponse,
-): ValidationExceptionInterface => {
-  const error = {} as ValidationExceptionInterface;
-  error.name = "ValidationException";
-  error.violations = response.violations.map(
-    (violation) => `${violation.title}: ${violation.propertyPath}`,
-  );
-  error.titles = response.violations.map((violation) => violation.title);
-  error.propertyPaths = response.violations.map(
-    (violation) => violation.propertyPath,
-  );
-  return error;
-};
-
 // eslint-disable-next-line @typescript-eslint/no-unused-vars
 const AccessException = (response: Response): AccessExceptionInterface => {
   const error = {} as AccessExceptionInterface;