feat: add Spectral rules to validate required operation channe and ch…

…annel servers field (#913)

src/ruleset/v3/ruleset.ts

@@ -2,6 +2,7 @@
 
 import { AsyncAPIFormats } from '../formats';
 import { operationMessagesUnambiguity } from './functions/operationMessagesUnambiguity';
+import { pattern } from '@stoplight/spectral-functions';
 
 export const v3CoreRuleset = {
   description: 'Core AsyncAPI 3.x.x ruleset.',
@@ -24,5 +25,37 @@ export const v3CoreRuleset = {
         function: operationMessagesUnambiguity,
       },
     },
+    'asyncapi3-required-operation-channel-unambiguity': {
+      description: 'The "channel" field of an operation under the root "operations" object must always reference a channel under the root "channels" object.',
+      severity: 'error',
+      recommended: true,
+      resolved: false, // We use the JSON pointer to match the channel.
+      given: '$.operations.*',      
+      then: {
+        field: 'channel.$ref',
+        function: pattern,
+        functionOptions: {
+          match: '#\\/channels\\/', // If doesn't match, rule fails.
+        },
+      },
+    },
+
+    /**
+     * Channel Object rules
+     */
+    'asyncapi3-required-channel-servers-unambiguity': {
+      description: 'The "servers" field of a channel under the root "channels" object must always reference a subset of the servers under the root "servers" object.',
+      severity: 'error',
+      recommended: true,
+      resolved: false, // We use the JSON pointer to match the channel.
+      given: '$.channels.*',      
+      then: {
+        field: '$.servers.*.$ref',
+        function: pattern,
+        functionOptions: {
+          match: '#\\/servers\\/', // If doesn't match, rule fails.
+        },
+      },
+    }
   },
 };

test/ruleset/rules/v3/asyncapi3-required-channel-servers-unambiguity.spec.ts

@@ -0,0 +1,210 @@
+import { testRule, DiagnosticSeverity } from '../../tester';
+
+testRule('asyncapi3-required-channel-servers-unambiguity', [
+  {
+    name: 'valid case - required channel (under root) server field points to a subset of required servers (under root)',
+    document: {
+      asyncapi: '3.0.0',
+      info: {
+        title: 'Account Service',
+        version: '1.0.0'
+      },
+      servers: {
+        prod: {
+          host: 'my-api.com',
+          protocol: 'ws',
+        },
+        dev: {
+          host: 'localhost',
+          protocol: 'ws',
+        },
+      },
+      channels: {
+        UserSignedUp: {
+          servers: [
+            { $ref: '#/servers/prod' },
+            { $ref: '#/servers/dev' },
+          ]
+        }
+      },
+    },
+    errors: [],
+  },
+  {
+    name: 'valid case - required channel (under root) server field points to a subset of required servers (under root) from an external doc',
+    document: {
+      asyncapi: '3.0.0',
+      info: {
+        title: 'Account Service',
+        version: '1.0.0'
+      },
+      channels: {
+        UserSignedUp: {
+          servers: [
+            { $ref: 'http://foo.bar/components/file.yml#/servers/prod' },
+            { $ref: 'http://foo.bar/components/file.yml#/servers/dev' },
+          ]
+        }
+      },
+    },
+    errors: [],
+  },
+  {
+    name: 'valid case - optional channel (under components) server field points to a subset of required servers (under root)',
+    document: {
+      asyncapi: '3.0.0',
+      info: {
+        title: 'Account Service',
+        version: '1.0.0'
+      },
+      servers: {
+        prod: {
+          host: 'my-api.com',
+          protocol: 'ws',
+        },
+        dev: {
+          host: 'localhost',
+          protocol: 'ws',
+        },
+      },
+      components: {
+        channels: {
+          UserSignedUp: {
+            servers: [
+              { $ref: '#/servers/prod' },
+              { $ref: '#/servers/dev' },
+            ]
+          }
+        },
+      },
+    },
+    errors: [],
+  },
+  {
+    name: 'valid case - optional channel (under components) server field points to a subset of optional servers (under components)',
+    document: {
+      asyncapi: '3.0.0',
+      info: {
+        title: 'Account Service',
+        version: '1.0.0'
+      },
+      components: {
+        servers: {
+          prod: {
+            host: 'my-api.com',
+            protocol: 'ws',
+          },
+          dev: {
+            host: 'localhost',
+            protocol: 'ws',
+          },
+        },
+        channels: {
+          UserSignedUp: {
+            messages: {
+              UserSignedUp: {
+                payload: {
+                  type: 'object',
+                  properties: {
+                    displayName: {
+                      type: 'string'
+                    },
+                    email: {
+                      type: 'string'
+                    }
+                  }
+                }
+              }
+            }
+          }
+        },
+        operations: {
+          UserSignedUp: {
+            action: 'send',
+            channel: {
+              $ref: '#/components/channels/UserSignedUp'
+            },
+            messages: [
+              {
+                $ref: '#/components/channels/UserSignedUp/messages/UserSignedUp'
+              }
+            ]
+          }
+        }
+      }
+    },
+    errors: [],
+  },
+  {
+    name: 'invalid case - required channel (in root) servers field points to a subset of optional servers (under components)',
+    document: {
+      asyncapi: '3.0.0',
+      info: {
+        title: 'Account Service',
+        version: '1.0.0'
+      },
+      channels: {
+        UserSignedUp: {
+          servers: [
+            { $ref: '#/components/servers/prod' },
+            { $ref: '#/components/servers/dev' },
+          ]
+        }
+      },
+      components: {
+        servers: {
+          prod: {
+            host: 'my-api.com',
+            protocol: 'ws',
+          },
+          dev: {
+            host: 'localhost',
+            protocol: 'ws',
+          },
+        }
+      }
+    },
+    errors: [
+      {
+        message: 'The "servers" field of a channel under the root "channels" object must always reference a subset of the servers under the root "servers" object.',
+        path: ['channels', 'UserSignedUp', 'servers', '0', '$ref'],
+        severity: DiagnosticSeverity.Error,
+      },
+      {
+        message: 'The "servers" field of a channel under the root "channels" object must always reference a subset of the servers under the root "servers" object.',
+        path: ['channels', 'UserSignedUp', 'servers', '1', '$ref'],
+        severity: DiagnosticSeverity.Error,
+      }
+    ],
+  },
+  {
+    name: 'invalid case - required channel (in root) servers field points to a subset of optional servers (under components) from an external doc',
+    document: {
+      asyncapi: '3.0.0',
+      info: {
+        title: 'Account Service',
+        version: '1.0.0'
+      },
+      channels: {
+        UserSignedUp: {
+          servers: [
+            { $ref: 'http://foo.bar/components/file.yml#/components/servers/prod' },
+            { $ref: 'http://foo.bar/components/file.yml#/components/servers/dev' },
+          ]
+        }
+      }
+    },
+    errors: [
+      {
+        message: 'The "servers" field of a channel under the root "channels" object must always reference a subset of the servers under the root "servers" object.',
+        path: ['channels', 'UserSignedUp', 'servers', '0', '$ref'],
+        severity: DiagnosticSeverity.Error,
+      },
+      {
+        message: 'The "servers" field of a channel under the root "channels" object must always reference a subset of the servers under the root "servers" object.',
+        path: ['channels', 'UserSignedUp', 'servers', '1', '$ref'],
+        severity: DiagnosticSeverity.Error,
+      }
+    ],
+  },
+]);