feat: add module contracts and discovery

packages/contracts/src/identifiers.ts

@@ -0,0 +1,60 @@
+import { z } from "zod";
+
+const localIdentifierPattern = /^[a-z][a-z0-9]*(?:-[a-z0-9]+)*$/u;
+const namespacedIdentifierPattern =
+  /^[a-z][a-z0-9]*(?:-[a-z0-9]+)*(?:\.[a-z][a-z0-9]*(?:-[a-z0-9]+)*)+$/u;
+
+export const moduleIdSchema = z
+  .string()
+  .min(1)
+  .max(64)
+  .regex(localIdentifierPattern, "Must be a lowercase kebab-case module identifier.");
+
+export const capabilityIdSchema = z
+  .string()
+  .min(3)
+  .max(160)
+  .regex(namespacedIdentifierPattern, "Must be a lowercase dot-namespaced capability identifier.");
+
+export const permissionIdSchema = z
+  .string()
+  .min(3)
+  .max(160)
+  .regex(namespacedIdentifierPattern, "Must be a lowercase dot-namespaced permission identifier.");
+
+export const logicalBucketIdSchema = z
+  .string()
+  .min(1)
+  .max(48)
+  .regex(localIdentifierPattern, "Must be a lowercase kebab-case logical bucket identifier.");
+
+export const packageRelativePathSchema = z.string().superRefine((value, context) => {
+  if (!value.startsWith("./")) {
+    context.addIssue({
+      code: "custom",
+      message: "Must begin with ./ and remain inside the module package.",
+    });
+    return;
+  }
+
+  if (value.includes("\\") || value.includes("\0") || value.includes("?") || value.includes("#")) {
+    context.addIssue({
+      code: "custom",
+      message: "Must be a portable package-relative path without URLs, queries, or fragments.",
+    });
+  }
+
+  const segments = value.slice(2).split("/");
+  if (segments.some((segment) => segment === "" || segment === "." || segment === "..")) {
+    context.addIssue({
+      code: "custom",
+      message: "Must not contain empty, current-directory, or parent-directory segments.",
+    });
+  }
+});
+
+export type ModuleId = z.infer<typeof moduleIdSchema>;
+export type CapabilityId = z.infer<typeof capabilityIdSchema>;
+export type PermissionId = z.infer<typeof permissionIdSchema>;
+export type LogicalBucketId = z.infer<typeof logicalBucketIdSchema>;
+export type PackageRelativePath = z.infer<typeof packageRelativePathSchema>;

packages/contracts/src/index.ts

@@ -0,0 +1,4 @@
+export * from "./identifiers.js";
+export * from "./module-lifecycle.js";
+export * from "./module-manifest.js";
+export * from "./versions.js";

packages/contracts/src/module-lifecycle.ts

@@ -0,0 +1,17 @@
+import { z } from "zod";
+
+export const MODULE_LIFECYCLE_STAGES = [
+  "discovered",
+  "validated",
+  "configured",
+  "registered",
+  "migrated",
+  "initialized",
+  "started",
+  "stopped",
+  "failed",
+] as const;
+
+export const moduleLifecycleStageSchema = z.enum(MODULE_LIFECYCLE_STAGES);
+
+export type ModuleLifecycleStage = z.infer<typeof moduleLifecycleStageSchema>;

packages/contracts/src/module-manifest.ts

@@ -0,0 +1,199 @@
+import { z } from "zod";
+import {
+  capabilityIdSchema,
+  logicalBucketIdSchema,
+  moduleIdSchema,
+  packageRelativePathSchema,
+  permissionIdSchema,
+} from "./identifiers.js";
+import { semanticVersionRangeSchema, semanticVersionSchema } from "./versions.js";
+
+const moduleVersionMapSchema = z.record(moduleIdSchema, semanticVersionRangeSchema);
+
+const moduleDependenciesSchema = z
+  .object({
+    required: moduleVersionMapSchema.default(() => ({})),
+    optional: moduleVersionMapSchema.default(() => ({})),
+  })
+  .strict()
+  .default(() => ({ required: {}, optional: {} }));
+
+const capabilityDependenciesSchema = z
+  .object({
+    required: z.array(capabilityIdSchema).default(() => []),
+    optional: z.array(capabilityIdSchema).default(() => []),
+  })
+  .strict()
+  .default(() => ({ required: [], optional: [] }));
+
+const dependenciesSchema = z
+  .object({
+    modules: moduleDependenciesSchema,
+    capabilities: capabilityDependenciesSchema,
+  })
+  .strict()
+  .default(() => ({
+    modules: { required: {}, optional: {} },
+    capabilities: { required: [], optional: [] },
+  }));
+
+export const moduleBucketDeclarationSchema = z
+  .object({
+    id: logicalBucketIdSchema,
+    description: z.string().trim().min(1).max(240).optional(),
+  })
+  .strict();
+
+const moduleStorageSchema = z
+  .object({
+    buckets: z.array(moduleBucketDeclarationSchema).default(() => []),
+  })
+  .strict()
+  .default(() => ({ buckets: [] }));
+
+const entrypointsSchema = z
+  .object({
+    server: packageRelativePathSchema,
+    schema: packageRelativePathSchema.optional(),
+    migrations: packageRelativePathSchema.optional(),
+    jobs: packageRelativePathSchema.optional(),
+  })
+  .strict();
+
+function reportDuplicates(
+  values: readonly string[],
+  path: readonly (string | number)[],
+  context: z.RefinementCtx,
+): void {
+  const seen = new Set<string>();
+  values.forEach((value, index) => {
+    if (seen.has(value)) {
+      context.addIssue({
+        code: "custom",
+        message: `${value} is declared more than once.`,
+        path: [...path, index],
+      });
+    }
+    seen.add(value);
+  });
+}
+
+export const moduleManifestSchema = z
+  .object({
+    manifestVersion: z.literal(1),
+    id: moduleIdSchema,
+    name: z.string().trim().min(1).max(120),
+    description: z.string().trim().min(1).max(500).optional(),
+    version: semanticVersionSchema,
+    compatibility: z
+      .object({
+        platform: semanticVersionRangeSchema,
+        moduleSdk: semanticVersionRangeSchema,
+      })
+      .strict(),
+    dependencies: dependenciesSchema,
+    capabilities: z.array(capabilityIdSchema).default(() => []),
+    permissions: z.array(permissionIdSchema).default(() => []),
+    storage: moduleStorageSchema,
+    entrypoints: entrypointsSchema,
+  })
+  .strict()
+  .superRefine((manifest, context) => {
+    reportDuplicates(manifest.capabilities, ["capabilities"], context);
+    reportDuplicates(manifest.permissions, ["permissions"], context);
+    reportDuplicates(
+      manifest.dependencies.capabilities.required,
+      ["dependencies", "capabilities", "required"],
+      context,
+    );
+    reportDuplicates(
+      manifest.dependencies.capabilities.optional,
+      ["dependencies", "capabilities", "optional"],
+      context,
+    );
+    reportDuplicates(
+      manifest.storage.buckets.map((bucket) => bucket.id),
+      ["storage", "buckets"],
+      context,
+    );
+
+    manifest.capabilities.forEach((capability, index) => {
+      if (!capability.startsWith(`${manifest.id}.`)) {
+        context.addIssue({
+          code: "custom",
+          message: `Capability identifiers owned by this module must begin with ${manifest.id}.`,
+          path: ["capabilities", index],
+        });
+      }
+    });
+
+    manifest.permissions.forEach((permission, index) => {
+      if (!permission.startsWith(`${manifest.id}.`)) {
+        context.addIssue({
+          code: "custom",
+          message: `Permission identifiers owned by this module must begin with ${manifest.id}.`,
+          path: ["permissions", index],
+        });
+      }
+    });
+
+    for (const dependencyKind of ["required", "optional"] as const) {
+      if (Object.hasOwn(manifest.dependencies.modules[dependencyKind], manifest.id)) {
+        context.addIssue({
+          code: "custom",
+          message: "A module cannot depend on itself.",
+          path: ["dependencies", "modules", dependencyKind, manifest.id],
+        });
+      }
+    }
+
+    for (const dependencyId of Object.keys(manifest.dependencies.modules.required)) {
+      if (Object.hasOwn(manifest.dependencies.modules.optional, dependencyId)) {
+        context.addIssue({
+          code: "custom",
+          message: `${dependencyId} cannot be both a required and optional module dependency.`,
+          path: ["dependencies", "modules", "optional", dependencyId],
+        });
+      }
+    }
+
+    const ownedCapabilities = new Set(manifest.capabilities);
+    const requiredCapabilities = new Set(manifest.dependencies.capabilities.required);
+    manifest.dependencies.capabilities.required.forEach((capability, index) => {
+      if (ownedCapabilities.has(capability)) {
+        context.addIssue({
+          code: "custom",
+          message: "A module does not need to depend on a capability it owns.",
+          path: ["dependencies", "capabilities", "required", index],
+        });
+      }
+    });
+    manifest.dependencies.capabilities.optional.forEach((capability, index) => {
+      if (ownedCapabilities.has(capability)) {
+        context.addIssue({
+          code: "custom",
+          message: "A module does not need to depend on a capability it owns.",
+          path: ["dependencies", "capabilities", "optional", index],
+        });
+      }
+      if (requiredCapabilities.has(capability)) {
+        context.addIssue({
+          code: "custom",
+          message: `${capability} cannot be both a required and optional capability dependency.`,
+          path: ["dependencies", "capabilities", "optional", index],
+        });
+      }
+    });
+  });
+
+export function parseModuleManifest(input: unknown): ModuleManifest {
+  return moduleManifestSchema.parse(input);
+}
+
+export function safeParseModuleManifest(input: unknown) {
+  return moduleManifestSchema.safeParse(input);
+}
+
+export type ModuleManifestInput = z.input<typeof moduleManifestSchema>;
+export type ModuleManifest = z.output<typeof moduleManifestSchema>;
+export type ModuleBucketDeclaration = z.output<typeof moduleBucketDeclarationSchema>;

packages/contracts/src/versions.ts

@@ -0,0 +1,20 @@
+import { satisfies, valid, validRange } from "semver";
+import { z } from "zod";
+
+export const semanticVersionSchema = z.string().refine((value) => valid(value) === value, {
+  message: "Must be a strict semantic version.",
+});
+
+export const semanticVersionRangeSchema = z
+  .string()
+  .min(1)
+  .refine((value) => validRange(value) !== null, {
+    message: "Must be a valid semantic version range.",
+  });
+
+export function isVersionCompatible(version: string, range: string): boolean {
+  return valid(version) === version && validRange(range) !== null && satisfies(version, range);
+}
+
+export type SemanticVersion = z.infer<typeof semanticVersionSchema>;
+export type SemanticVersionRange = z.infer<typeof semanticVersionRangeSchema>;