feat: wip casl policies (#334)

* feat: wip casl policies

* feat: add ability guard on pipeline resolvers

* fix: test

server/src/ability/handlers/pipeline.ability-handler.ts

@@ -0,0 +1,70 @@
+import { PrismaService } from 'src/database/prisma.service';
+import { AbilityAction } from '../ability.action';
+import { AppAbility } from '../ability.factory';
+import { IAbilityHandler } from '../interfaces/ability-handler.interface';
+import {
+  ExecutionContext,
+  Injectable,
+  NotFoundException,
+} from '@nestjs/common';
+import { PipelineWhereInput } from 'src/core/@generated/pipeline/pipeline-where.input';
+import { GqlExecutionContext } from '@nestjs/graphql';
+import { assert } from 'src/utils/assert';
+import { subject } from '@casl/ability';
+
+class PipelineArgs {
+  where?: PipelineWhereInput;
+}
+
+@Injectable()
+export class ManagePipelineAbilityHandler implements IAbilityHandler {
+  async handle(ability: AppAbility) {
+    return ability.can(AbilityAction.Manage, 'Pipeline');
+  }
+}
+
+@Injectable()
+export class ReadPipelineAbilityHandler implements IAbilityHandler {
+  handle(ability: AppAbility) {
+    return ability.can(AbilityAction.Read, 'Pipeline');
+  }
+}
+
+@Injectable()
+export class CreatePipelineAbilityHandler implements IAbilityHandler {
+  handle(ability: AppAbility) {
+    return ability.can(AbilityAction.Create, 'Pipeline');
+  }
+}
+
+@Injectable()
+export class UpdatePipelineAbilityHandler implements IAbilityHandler {
+  constructor(private readonly prismaService: PrismaService) {}
+
+  async handle(ability: AppAbility, context: ExecutionContext) {
+    const gqlContext = GqlExecutionContext.create(context);
+    const args = gqlContext.getArgs<PipelineArgs>();
+    const pipeline = await this.prismaService.pipeline.findFirst({
+      where: args.where,
+    });
+    assert(pipeline, '', NotFoundException);
+
+    return ability.can(AbilityAction.Update, subject('Pipeline', pipeline));
+  }
+}
+
+@Injectable()
+export class DeletePipelineAbilityHandler implements IAbilityHandler {
+  constructor(private readonly prismaService: PrismaService) {}
+
+  async handle(ability: AppAbility, context: ExecutionContext) {
+    const gqlContext = GqlExecutionContext.create(context);
+    const args = gqlContext.getArgs<PipelineArgs>();
+    const pipeline = await this.prismaService.pipeline.findFirst({
+      where: args.where,
+    });
+    assert(pipeline, '', NotFoundException);
+
+    return ability.can(AbilityAction.Delete, subject('Pipeline', pipeline));
+  }
+}