commit 0c796db854232e77ff7235654b6415e9585b04aa
Author: OverPoweredDev <omkar.prabhune19@vit.edu>
Date:   Sun Jul 11 17:12:03 2021 +0530

    added language pair verification

diff --git a/src/content/content.js b/src/content/content.js
index 06d388c..e0bd10c 100644
--- a/src/content/content.js
+++ b/src/content/content.js
@@ -23,8 +23,12 @@ browser.runtime.onMessage.addListener(async function(request, sender, sendRespon
         sourceLanguage = await getWebsiteLanguage();
     }
 
-    await translateWebpage(sourceLanguage, settings.defaultLanguage);
-    sendResponse({});
+    if(verifyLangPairs(sourceLanguage, settings.defaultLanguage)) {
+        await translateWebpage(sourceLanguage, settings.defaultLanguage);
+        sendResponse({translated: true});
+    } else {
+        sendResponse({translated: false, problem: 'Invalid Language Pair'});
+    }
 });
 
 async function addHoverElements(settings) {
diff --git a/src/lib/storage.js b/src/lib/storage.js
index 0eb8a8c..7b9cc4a 100644
--- a/src/lib/storage.js
+++ b/src/lib/storage.js
@@ -26,22 +26,27 @@ function saveGlobalSettings(settings) {
 function getLangPairs() {
     let langPairs = localStorage.getItem("apertium.langPairs");
 
-    if(langPairs === null) {
+    if (langPairs === null) {
         let languageList = fetchLanguageList(getLangPairsEndpoint());
-        console.log(languageList)
-        createLanguagePairs(languageList);
+        return createLanguagePairs(languageList);
     }
 
     return JSON.parse(langPairs);
 }
 
+function verifyLangPairs(sourceLang, targetLang) {
+    let langPairs = getLangPairs().langPairs;
+    let langPairExists = (pair) => pair.sourceLanguage === sourceLang && pair.targetLanguage === targetLang
+    return langPairs.some(langPairExists)
+}
+
 async function fetchLanguageList(listPairURL) {
     return fetch(listPairURL)
         .then(response => response.json())
         .then(data => data.responseData);
 }
 
-function createLanguagePairs(languageList){
+function createLanguagePairs(languageList) {
     let current = new Date();
 
     let langPairs = {
diff --git a/src/lib/translate.js b/src/lib/translate.js
index 2ccb3f0..f003c07 100644
--- a/src/lib/translate.js
+++ b/src/lib/translate.js
@@ -52,6 +52,7 @@ async function translateWebpage(sourceLanguage, targetLanguage) {
     let transportDocument = createNewDocument(textElements);
 
     let translatedDocument = await getTranslatedDocument(sourceLanguage, targetLanguage, transportDocument, 'transport.html');
+    console.log(translatedDocument);
 }
 
 function createNewDocument(nodeList) {
@@ -88,15 +89,13 @@ async function getTranslatedDocument(sourceLanguage, targetLanguage, file, filen
     formData.append('langpair', langPair);
     formData.append('file', file, filename)
 
-    fetch(getTranslateDocEndpoint(), {
+    let blob = await fetch(getTranslateDocEndpoint(), {
         method: 'POST',
         body: formData
-    })
-        .then(response => response.blob())
-        .then((blob) => {
-        console.log(blob);
-        download(blob, filename);
-    })
+    }).then(response => response.blob());
+
+    download(blob, filename);
+    return (await blob).text();
 }
 
 // everything below courtesy of https://gist.github.com/TinoDidriksen/c41c33ca5809ff297bf7b1608b3a41e2
diff --git a/src/popup/popup.js b/src/popup/popup.js
index d3d6ae5..6857d32 100644
--- a/src/popup/popup.js
+++ b/src/popup/popup.js
@@ -94,6 +94,8 @@ $("#translate-button").on('click', async function () {
     let targetLanguage = await getTargetLanguage();
     if (!targetLanguage || targetLanguage === 'select') return;
 
+    if(!verifyLangPairs(sourceLanguage, targetLanguage)) return;
+
     getTranslation(translateInput, sourceLanguage, targetLanguage).then(translateOutput => {
         $(".output-text-box").val(translateOutput);
     });