Added checks to make sure the specified track exists

Added precondition checks to validate input files and paths to return more informative error messages as per #2

lib/edits.js

@@ -26,6 +26,11 @@ function uploadRelease(options, releaseFile) {
             auth: options.auth,
             packageName: options.applicationId
         });
+        const allTracks = yield getAllTracks(appEdit.data, options);
+        if (allTracks == undefined || allTracks.find(value => value.track == options.track) == undefined) {
+            core.setFailed(`Track "${options.track}" could not be found `);
+            return Promise.reject(`No track found for "${options.track}"`);
+        }
         let track = undefined;
         if (releaseFile.endsWith('.apk')) {
             const apk = yield uploadApk(appEdit.data, options, releaseFile);
@@ -51,6 +56,16 @@ function uploadRelease(options, releaseFile) {
     });
 }
 exports.uploadRelease = uploadRelease;
+function getAllTracks(appEdit, options) {
+    return __awaiter(this, void 0, void 0, function* () {
+        const res = yield androidPublisher.edits.tracks.list({
+            auth: options.auth,
+            editId: appEdit.id,
+            packageName: options.applicationId
+        });
+        return res.data.tracks;
+    });
+}
 function trackVersionCode(appEdit, options, versionCode) {
     return __awaiter(this, void 0, void 0, function* () {
         let status;

lib/main.js

@@ -16,6 +16,7 @@ var __importStar = (this && this.__importStar) || function (mod) {
 };
 Object.defineProperty(exports, "__esModule", { value: true });
 const core = __importStar(require("@actions/core"));
+const fs = __importStar(require("fs"));
 const edits_1 = require("./edits");
 const { google } = require('googleapis');
 const auth = new google.auth.GoogleAuth({
@@ -42,6 +43,19 @@ function run() {
             else {
                 userFractionFloat = undefined;
             }
+            // Check release file
+            if (!fs.existsSync(releaseFile)) {
+                core.setFailed(`Unable to find release file @ ${releaseFile}`);
+                return;
+            }
+            if (whatsNewDir != undefined && !fs.existsSync(whatsNewDir)) {
+                core.setFailed(`Unable to find 'whatsnew' directory @ ${whatsNewDir}`);
+                return;
+            }
+            if (mappingFile != undefined && !fs.existsSync(mappingFile)) {
+                core.setFailed(`Unable to find 'mappingFile' @ ${mappingFile}`);
+                return;
+            }
             // Insure that the api can find our service account credentials
             core.exportVariable("GOOGLE_APPLICATION_CREDENTIALS", serviceAccountJson);
             const authClient = yield auth.getClient();