feat: add ValidationException

package.json

@@ -11,8 +11,8 @@
     "lint": "eslint --ext .ts ./src",
     "lint:fix": "npm run lint -- --fix",
     "pretest": "echo ' 🔑 Creating valid keypair for testing' && sh test/make-private-keys.sh &> /dev/null",
-    "test:unit": "mocha -r dotenv/config -r ts-node/register ./src/**/*.spec.ts",
-    "test:integration": "mocha -r dotenv/config -r ts-node/register --timeout 10000 ./test/**/*.test.ts",
+    "test:unit": "mocha -r dotenv/config -r ts-node/register './src/**/*.spec.ts'",
+    "test:integration": "mocha -r dotenv/config -r ts-node/register --timeout 10000 './test/**/*.test.ts'",
     "test": "npm run test:unit && npm run test:integration",
     "build": "rm -rf lib && tsc",
     "build:docs": "typedoc --options .typedocrc.json src",

src/index.ts

@@ -1,5 +1,11 @@
 export { getManagementToken } from './keys'
-export { signRequest, verifyRequest, ContentfulHeader, ExpiredRequestException } from './requests'
+export {
+  signRequest,
+  verifyRequest,
+  ContentfulHeader,
+  ExpiredRequestException,
+  ValidationException,
+} from './requests'
 
 export type {
   AppActionCallContext,

src/requests/exceptions.ts

@@ -8,3 +8,15 @@ export class ExpiredRequestException extends Error {
     this.message = `[${this.constructor.name}]: Requests are expected to be verified within ${this.ttl}s from their signature.`
   }
 }
+
+export class ValidationException extends Error {
+  constructor(
+    message: string,
+    /* eslint-disable no-unused-vars */
+    readonly constraintName?: string,
+    readonly key?: string,
+    /* eslint-enable no-unused-vars */
+  ) {
+    super(message)
+  }
+}

src/requests/index.ts

@@ -1,4 +1,4 @@
-export { ExpiredRequestException } from './exceptions'
+export { ExpiredRequestException, ValidationException } from './exceptions'
 export { signRequest } from './sign-request'
 export { verifyRequest } from './verify-request'
 export { ContentfulHeader, ContentfulContextHeader } from './typings'

src/requests/sign-request.spec.ts

@@ -1,4 +1,5 @@
 import * as assert from 'assert'
+import { ValidationException } from './exceptions'
 import { CanonicalRequest, Secret } from './typings'
 import { signRequest } from './sign-request'
 
@@ -21,7 +22,7 @@ const assertThrowsForFieldInValues = (field: keyof CanonicalRequest, values: any
         },
         VALID_TIMESTAMP,
       )
-    }, `Did not throw for ${field.toString()}:${value}`)
+    }, ValidationException)
   }
 }
 
@@ -59,9 +60,9 @@ describe('create-signature', () => {
 
       for (const secret of invalidSecrets) {
         assert.throws(() => {
-          // @ts-ignore
+          // @ts-expect-error
           signRequest(secret, VALID_REQUEST, VALID_TIMESTAMP)
-        }, `Did not throw for ${secret}`)
+        }, ValidationException)
       }
     })
     it('does not throw if valid', () => {
@@ -77,9 +78,9 @@ describe('create-signature', () => {
 
       for (const timestamp of invalidTimestamps) {
         assert.throws(() => {
-          // @ts-ignore
+          // @ts-expect-error
           signRequest(VALID_SECRET, VALID_REQUEST, timestamp)
-        }, `Did not throw for ${timestamp}`)
+        }, ValidationException)
       }
     })
     it('does not throw if missing', () => {

src/requests/typings/validators/index.ts

@@ -0,0 +1,78 @@
+import * as runtypes from 'runtypes'
+import { proxyValidationError } from './proxy-validation-error'
+
+const MethodValidator = proxyValidationError(
+  runtypes.Union(
+    runtypes.Literal('GET'),
+    runtypes.Literal('PATCH'),
+    runtypes.Literal('HEAD'),
+    runtypes.Literal('POST'),
+    runtypes.Literal('DELETE'),
+    runtypes.Literal('OPTIONS'),
+    runtypes.Literal('PUT'),
+  ),
+)
+
+const PathValidator = proxyValidationError(
+  runtypes.String.withConstraint((s) => s.startsWith('/'), {
+    name: 'CanonicalURI',
+  }),
+)
+
+const SignatureValidator = proxyValidationError(
+  runtypes.String.withConstraint((s) => s.length === 64, {
+    name: 'SignatureLength',
+  }),
+)
+
+export const CanonicalRequestValidator = proxyValidationError(
+  runtypes
+    .Record({
+      method: MethodValidator,
+      path: PathValidator,
+    })
+    .And(
+      runtypes.Partial({
+        headers: runtypes.Dictionary(runtypes.String, 'string'),
+        body: runtypes.String,
+      }),
+    ),
+)
+export type CanonicalRequest = runtypes.Static<typeof CanonicalRequestValidator>
+
+export const SecretValidator = proxyValidationError(
+  runtypes.String.withConstraint((s) => s.length === 64, {
+    name: 'SecretLength',
+  }),
+)
+export type Secret = runtypes.Static<typeof SecretValidator>
+
+// Only dates after 01-01-2020
+export const TimestampValidator = proxyValidationError(
+  runtypes.Number.withConstraint((n) => n > 1577836800000, {
+    name: 'TimestampAge',
+  }),
+)
+export type Timestamp = runtypes.Static<typeof TimestampValidator>
+
+const SignedHeadersValidator = proxyValidationError(
+  runtypes
+    .Array(runtypes.String)
+    .withConstraint((l) => l.length >= 2, { name: 'MissingTimestampOrSignedHeaders' }),
+)
+
+export const RequestMetadataValidator = proxyValidationError(
+  runtypes.Record({
+    signature: SignatureValidator,
+    timestamp: TimestampValidator,
+    signedHeaders: SignedHeadersValidator,
+  }),
+)
+export type RequestMetadata = runtypes.Static<typeof RequestMetadataValidator>
+
+export const TimeToLiveValidator = proxyValidationError(
+  runtypes.Number.withConstraint((n) => n >= 0, {
+    name: 'PositiveNumber',
+  }),
+)
+export type TimeToLive = runtypes.Static<typeof TimeToLiveValidator>

src/requests/typings/validators/proxy-validation-error.spec.ts

@@ -0,0 +1,88 @@
+import * as assert from 'assert'
+import * as runtypes from 'runtypes'
+import { ValidationException } from '../../exceptions'
+import { proxyValidationError } from './proxy-validation-error'
+
+describe('proxyValidationError', () => {
+  describe('scalar without named constraint', () => {
+    it('converts to ValidationException', () => {
+      assert.throws(() => {
+        try {
+          proxyValidationError(
+            runtypes.Union(runtypes.Literal('val1'), runtypes.Literal('val2')),
+          ).check('invalid')
+        } catch (error) {
+          if (error instanceof ValidationException) {
+            assert.strictEqual(error.constraintName, undefined)
+            assert.strictEqual(error.key, undefined)
+          }
+
+          throw error
+        }
+      }, ValidationException)
+    })
+  })
+
+  describe('scalar with named constraint', () => {
+    it('converts to ValidationException without constraint name', () => {
+      assert.throws(() => {
+        try {
+          proxyValidationError(
+            runtypes.String.withConstraint((s) => s === 'value', { name: 'constraint-name' }),
+          ).check('invalid')
+        } catch (error) {
+          if (error instanceof ValidationException) {
+            assert.strictEqual(error.constraintName, 'constraint-name')
+            assert.strictEqual(error.key, undefined)
+          }
+
+          throw error
+        }
+      }, ValidationException)
+    })
+  })
+
+  describe('object without named constraint', () => {
+    it('converts to ValidationException with key', () => {
+      assert.throws(() => {
+        try {
+          proxyValidationError(
+            runtypes.Record({
+              field: runtypes.Union(runtypes.Literal('val1'), runtypes.Literal('val2')),
+            }),
+          ).check({ field: 'invalid' })
+        } catch (error) {
+          if (error instanceof ValidationException) {
+            assert.strictEqual(error.constraintName, undefined)
+            assert.strictEqual(error.key, 'field')
+          }
+
+          throw error
+        }
+      }, ValidationException)
+    })
+  })
+
+  describe('object with named constraint', () => {
+    it('converts to ValidationException with key and constraint name', () => {
+      assert.throws(() => {
+        try {
+          proxyValidationError(
+            runtypes.Record({
+              field: runtypes.String.withConstraint((s) => s === 'value', {
+                name: 'constraint-name',
+              }),
+            }),
+          ).check({ field: 'invalid' })
+        } catch (error) {
+          if (error instanceof ValidationException) {
+            assert.strictEqual(error.constraintName, 'constraint-name')
+            assert.strictEqual(error.key, 'field')
+          }
+
+          throw error
+        }
+      }, ValidationException)
+    })
+  })
+})

src/requests/typings/validators/proxy-validation-error.ts

@@ -0,0 +1,37 @@
+import * as runtypes from 'runtypes'
+import { ValidationException } from '../../exceptions'
+
+const NAMED_CONSTRAINT_FAILURE_MSG = /^Failed (.+?) check/
+
+// eslint-disable-next-line no-unused-vars
+export function proxyValidationError<T extends object>(constraint: T): T {
+  // eslint-disable-next-line no-undef
+  return new Proxy(constraint, {
+    get(target, property) {
+      const value = target[property as keyof T]
+      if (typeof value !== 'function') {
+        return value
+      }
+
+      return (...args: unknown[]) => {
+        try {
+          return value(...args)
+        } catch (error) {
+          if (error instanceof runtypes.ValidationError) {
+            let constraintName = undefined
+            if ('name' in constraint && typeof constraint.name === 'string') {
+              constraintName = constraint.name
+            } else {
+              const result = NAMED_CONSTRAINT_FAILURE_MSG.exec(error.message)
+              constraintName = result ? result[1] : undefined
+            }
+
+            throw new ValidationException(error.message, constraintName, error.key)
+          }
+
+          throw error
+        }
+      }
+    },
+  })
+}

src/requests/verify-request.spec.ts

@@ -9,7 +9,7 @@ import {
   Context,
 } from './typings'
 import { signRequest } from './sign-request'
-import { ExpiredRequestException } from './exceptions'
+import { ExpiredRequestException, ValidationException } from './exceptions'
 
 const makeContextHeaders = (subject?: { appId: string } | { userId: string }) => {
   return subject
@@ -203,14 +203,14 @@ describe('verifyRequest', () => {
 
           delete incomingRequest.headers[ContentfulHeader.Signature]
 
-          assert.throws(() => verifyRequest(VALID_SECRET, incomingRequest))
+          assert.throws(() => verifyRequest(VALID_SECRET, incomingRequest), ValidationException)
         })
         it('throws when missing timestamp', () => {
           const incomingRequest = makeIncomingRequest({}, makeContextHeaders(contextHeaders))
 
           delete incomingRequest.headers[ContentfulHeader.Timestamp]
 
-          assert.throws(() => verifyRequest(VALID_SECRET, incomingRequest))
+          assert.throws(() => verifyRequest(VALID_SECRET, incomingRequest), ValidationException)
         })
         it('throws when missing signed headers', () => {
           const incomingRequest = makeIncomingRequest(
@@ -222,7 +222,7 @@ describe('verifyRequest', () => {
 
           delete incomingRequest.headers[ContentfulHeader.SignedHeaders]
 
-          assert.throws(() => verifyRequest(VALID_SECRET, incomingRequest))
+          assert.throws(() => verifyRequest(VALID_SECRET, incomingRequest), ValidationException)
         })
       })