fix: add newlines if they are missing (#50)

Author: rethab

src/index.ts

@@ -15,6 +15,9 @@ type Options = {
   cwd?: string;
 };
 
+const begin = "-----BEGIN RSA PRIVATE KEY-----";
+const end = "-----END RSA PRIVATE KEY-----";
+
 export function getPrivateKey(options: Options = {}): string | null {
   const env = options.env || process.env;
   const cwd = options.cwd || process.cwd();
@@ -31,11 +34,17 @@ export function getPrivateKey(options: Options = {}): string | null {
       privateKey = Buffer.from(privateKey, "base64").toString();
     }
 
-    const begin = "-----BEGIN RSA PRIVATE KEY-----";
-    const end = "-----END RSA PRIVATE KEY-----";
     if (privateKey.includes(begin) && privateKey.includes(end)) {
-      // Full key with new lines
-      return privateKey.replace(/\\n/g, "\n");
+      // newlines are escaped
+      if (privateKey.indexOf("\\n") !== -1) {
+        privateKey = privateKey.replace(/\\n/g, "\n");
+      }
+
+      // newlines are missing
+      if (privateKey.indexOf("\n") === -1) {
+        privateKey = addNewlines(privateKey);
+      }
+      return privateKey;
     }
 
     throw new Error(
@@ -65,4 +74,10 @@ export function getPrivateKey(options: Options = {}): string | null {
   return null;
 }
 
+function addNewlines(privateKey: string): string {
+  const middleLength = privateKey.length - begin.length - end.length - 2;
+  const middle = privateKey.substr(begin.length + 1, middleLength);
+  return `${begin}\n${middle.trim().replace(/\s+/g, "\n")}\n${end}`;
+}
+
 getPrivateKey.VERSION = VERSION;

test/get-private-key.test.ts

@@ -10,7 +10,16 @@ const readdirSync = fs.readdirSync as jest.Mock;
 const readFileSync = fs.readFileSync as jest.Mock;
 
 const PRIVATE_KEY =
-  "-----BEGIN RSA PRIVATE KEY-----\n ... \n-----END RSA PRIVATE KEY-----";
+  "-----BEGIN RSA PRIVATE KEY-----\n7HjkPK\nKLm395\nAIBII\n-----END RSA PRIVATE KEY-----";
+
+const PRIVATE_KEY_NO_NEWLINES =
+  "-----BEGIN RSA PRIVATE KEY----- 7HjkPK KLm395 AIBII -----END RSA PRIVATE KEY-----";
+
+const PRIVATE_KEY_NO_NEWLINES_MULTIPLE_SPACES =
+  "-----BEGIN RSA PRIVATE KEY----- 7HjkPK  KLm395 AIBII   -----END RSA PRIVATE KEY-----";
+
+const PRIVATE_KEY_ESCAPED_NEWLINES =
+  "-----BEGIN RSA PRIVATE KEY-----\\n7HjkPK\\nKLm395\\nAIBII\\n-----END RSA PRIVATE KEY-----";
 
 describe("getPrivateKey", () => {
   beforeEach(() => {
@@ -123,6 +132,24 @@ describe("getPrivateKey", () => {
       expect(result).toEqual(PRIVATE_KEY);
     });
 
+    it("PRIVATE_KEY contains no newlines", () => {
+      process.env.PRIVATE_KEY = PRIVATE_KEY_NO_NEWLINES;
+      const result = getPrivateKey();
+      expect(result).toEqual(PRIVATE_KEY);
+    });
+
+    it("PRIVATE_KEY contains consecutive spaces", () => {
+      process.env.PRIVATE_KEY = PRIVATE_KEY_NO_NEWLINES_MULTIPLE_SPACES;
+      const result = getPrivateKey();
+      expect(result).toEqual(PRIVATE_KEY);
+    });
+
+    it("PRIVATE_KEY contains escaped newlines", () => {
+      process.env.PRIVATE_KEY = PRIVATE_KEY_ESCAPED_NEWLINES;
+      const result = getPrivateKey();
+      expect(result).toEqual(PRIVATE_KEY);
+    });
+
     it("PRIVATE_KEY invalid", () => {
       process.env.PRIVATE_KEY = "invalid";
       expect(() => getPrivateKey()).toThrow(