Refactor how supply chain generation

src/__snapshots__/workflow.spec.ts.snap

@@ -377,24 +377,7 @@ jobs:
 "
 `;
 
-exports[`Workflow > supports supply chain attack, with writing the lock file 1`] = `
-"# Workflow automatically generated by gat
-# DO NOT CHANGE THIS FILE MANUALLY
-
-name: Supply chain attack
-on:
-  push: null
-jobs:
-  job1:
-    runs-on: ubuntu-22.04
-    timeout-minutes: 15
-    steps:
-      - name: Do something
-        uses: tj-actions/changed-files@a284dc1814e3fd07f2e34267fc8f81227ed29fb8
-"
-`;
-
-exports[`Workflow > supports supply chain attack, without writing the lock file 1`] = `
+exports[`Workflow > supports supply chain attack 1`] = `
 "# Workflow automatically generated by gat
 # DO NOT CHANGE THIS FILE MANUALLY
 

src/template.ts

@@ -0,0 +1,86 @@
+import fs from "fs";
+import { Octokit } from "@octokit/rest";
+
+import { Workflow } from "./workflow";
+
+interface CompileOptions {
+  templates: Record<string, Workflow>;
+  lockFilePath: string;
+  writeLockFile: boolean;
+}
+
+const createLockFile = async (
+  templates: Record<string, Workflow>,
+  lockFilePath: string,
+) => {
+  const actions = Object.values(templates).reduce<string[]>((acc, template) => {
+    template.jobs.forEach((job) => {
+      if ("steps" in job.options) {
+        job.options.steps.forEach((step) => {
+          if ("uses" in step) {
+            acc.push(step.uses);
+          }
+        });
+      }
+    });
+
+    return acc;
+  }, []);
+
+  const uniqueActions = [...new Set(actions)];
+
+  const octokit = process.env.GITHUB_TOKEN
+    ? new Octokit({
+        auth: process.env.GITHUB_TOKEN,
+      })
+    : new Octokit();
+
+  const resolvedActions: Record<string, string> = {};
+
+  await Promise.all(
+    uniqueActions.map(async (action) => {
+      const match = action.match(/(?<repository>.*)@(?<version>.*)/);
+
+      if (!match) return;
+
+      const { repository, version } = match.groups as {
+        repository: string;
+        version: string;
+      };
+
+      const [owner, repo] = repository.split("/");
+      const response = await octokit.rest.repos.listTags({
+        owner,
+        repo,
+      });
+
+      const tag = response.data.find((tag) => tag.name === version);
+
+      if (!tag) {
+        throw new Error(`Unable to retrieve ${action} from Github tags`);
+      }
+
+      resolvedActions[action] = `${repository}@${tag.commit.sha}`;
+    }),
+  );
+
+  fs.writeFileSync(lockFilePath, JSON.stringify(resolvedActions, null, 2));
+};
+
+export const compileTemplates = async (options: CompileOptions) => {
+  const { templates, lockFilePath, writeLockFile } = options;
+
+  if (writeLockFile) {
+    await createLockFile(templates, lockFilePath);
+  }
+
+  const resolvedActions = fs.existsSync(lockFilePath)
+    ? JSON.parse(fs.readFileSync(lockFilePath, "utf8"))
+    : {};
+
+  return Promise.all(
+    Object.entries(templates).map(([filePath, template]) =>
+      template.compile({ filePath, resolvedActions }),
+    ),
+  );
+};

src/workflow.spec.ts

@@ -1,7 +1,6 @@
-import { describe, it, expect } from "vitest";
+import { describe, expect, it } from "vitest";
 import { RunStep, UseStep } from "./step";
 import { Workflow } from "./workflow";
-import fs from "fs";
 
 describe("Workflow", () => {
   it("generates a simple workflow", async () => {
@@ -310,7 +309,7 @@ exit 0`,
     expect(await workflow.compile()).toMatchSnapshot();
   });
 
-  it("supports supply chain attack, without writing the lock file", async () => {
+  it("supports supply chain attack", async () => {
     const workflow = new Workflow("Supply chain attack");
 
     workflow.on("push").addJob("job1", {
@@ -319,39 +318,12 @@ exit 0`,
       ],
     });
 
-    fs.writeFileSync(
-      "/tmp/lockfile1.json",
-      JSON.stringify(
-        {
+    expect(
+      await workflow.compile({
+        resolvedActions: {
           "tj-actions/changed-files@v45.0.7":
             "tj-actions/changed-files@youhavebeenhacked",
         },
-        null,
-        2,
-      ),
-    );
-
-    expect(
-      await workflow.compile({
-        lockFilePath: "/tmp/lockfile1.json",
-        writeLockFile: false,
-      }),
-    ).toMatchSnapshot();
-  });
-
-  it("supports supply chain attack, with writing the lock file", async () => {
-    const workflow = new Workflow("Supply chain attack");
-
-    workflow.on("push").addJob("job1", {
-      steps: [
-        { name: "Do something", uses: "tj-actions/changed-files@v45.0.7" },
-      ],
-    });
-
-    expect(
-      await workflow.compile({
-        lockFilePath: "/tmp/lockfile2.json",
-        writeLockFile: true,
       }),
     ).toMatchSnapshot();
   });

src/workflow.ts

@@ -1,18 +1,17 @@
+import fs from "fs";
 import { dump } from "js-yaml";
 import kebabCase from "lodash/kebabCase";
-import fs from "fs";
 import path from "path";
 import { promisify } from "util";
-import { Octokit } from "@octokit/rest";
 
+import type { Event, EventName, EventOptions } from "./event";
 import {
   ConcurrencyGroup,
   Job,
   StepsJobOptions,
   StringWithNoSpaces,
   UsesJobOptions,
 } from "./job";
-import type { Event, EventName, EventOptions } from "./event";
 import { type Step, isUseStep } from "./step";
 
 const writeFilePromise = promisify(fs.writeFile);
@@ -26,88 +25,25 @@ interface EnvVar {
   value: string;
 }
 
-interface CompileOptions {
+interface WorkflowCompileOptions {
   filePath?: string;
-  lockFilePath?: string;
-  writeLockFile?: boolean;
+  resolvedActions?: Record<string, string>;
 }
 
 export type RunnerDefinition =
   | string
   | { group: string; labels?: string[] }
   | ["self-hosted", string];
 
-let firstCompileCall = true;
-
 const supplyChainAttack = async (
   step: Step,
-  compileOptions: CompileOptions,
+  resolvedActions: Record<string, string>,
 ) => {
-  const { lockFilePath, writeLockFile = false } = compileOptions;
-
   if (!isUseStep(step)) return;
 
-  // The user is not interested in frozen sha versions
-  if (!lockFilePath) return step.uses;
-
   const uses = step.uses;
 
-  const match = uses.match(/(?<repository>.*)@(?<version>.*)/);
-
-  // The uses is not a valid Github action with a tag
-  if (!match) return uses;
-
-  const { repository, version } = match.groups as {
-    repository: string;
-    version: string;
-  };
-
-  if (firstCompileCall && writeLockFile && fs.existsSync(lockFilePath)) {
-    firstCompileCall = false;
-
-    fs.rmSync(lockFilePath);
-  }
-
-  const chainAttackCache = fs.existsSync(lockFilePath)
-    ? JSON.parse(fs.readFileSync(lockFilePath, "utf8"))
-    : {};
-
-  if (chainAttackCache[uses]) return chainAttackCache[uses];
-
-  if (!writeLockFile) {
-    throw new Error(
-      `Unable to retrieve ${uses} from lock file and writeLockFile is false`,
-    );
-  }
-
-  const [owner, repo] = repository.split("/");
-
-  const octokit = process.env.GITHUB_TOKEN
-    ? new Octokit({
-        auth: process.env.GITHUB_TOKEN,
-      })
-    : new Octokit();
-
-  const response = await octokit.rest.repos.listTags({
-    owner,
-    repo,
-  });
-
-  const tag = response.data.find((tag) => tag.name === version);
-
-  if (!tag) {
-    throw new Error(`Unable to retrieve ${uses} from Github tags`);
-  }
-
-  const result = `${repository}@${tag.commit.sha}`;
-
-  chainAttackCache[uses] = result;
-
-  if (writeLockFile) {
-    fs.writeFileSync(lockFilePath, JSON.stringify(chainAttackCache, null, 2));
-  }
-
-  return result;
+  return resolvedActions[uses] ?? uses;
 };
 
 export class Workflow<
@@ -162,7 +98,7 @@ export class Workflow<
     return "ubuntu-22.04";
   }
 
-  async compile(compileOptions: CompileOptions = {}) {
+  async compile(compileOptions: WorkflowCompileOptions = {}) {
     const result = {
       name: this.name,
       on: Object.fromEntries(
@@ -284,7 +220,10 @@ export class Workflow<
                       "working-directory": workingDirectory,
                       "timeout-minutes": timeout,
                       ...options,
-                      uses: await supplyChainAttack(step, compileOptions),
+                      uses: await supplyChainAttack(
+                        step,
+                        compileOptions.resolvedActions ?? {},
+                      ),
                     };
                   }),
                 ),