Merge pull request #17 from GotPPay/summarizer-feature

4b. Summarizer feature

backend/config/constants.js

@@ -1,9 +1,9 @@
 const constants = {};
 
 constants.skillStage = {
-  IN_DEVELOPMENT : 'development',
-  LIVE : 'live'
-}
+  IN_DEVELOPMENT: 'development',
+  LIVE: 'live',
+};
 
 constants.amazonResultCodes = {
   OK: 200,
@@ -36,12 +36,17 @@ constants.voiceResponseStrings = {
   QUESTION_NOT_FOUND: 'Sorry, I didnt understand',
   GENERIC_CONTINUE: 'Say something to continue',
   DIDNT_ASK_ANYTHING: 'There was no question to answer to',
+  ERROR_SUMMARIZING_CONTENT: 'Sorry, there was problem with summarizing news',
+  ERROR_FETCHING_CONTENT: 'Failed to get content',
 };
 
 //Timing is given in [ms]
 constants.voiceResponseTimings = {
   PAUSE_BETWEEN_QUESTIONS: 650,
   PAUSE_AFTER_WELCOME_MESSAGE: 650,
+  PAUSE_BETWEEN_TITLES: 500,
+  PAUSE_BETWEEN_TITLE_AND_CONTENT: 500,
+  PAUSE_BETWEEN_NEWS: 800,
 };
 
 constants.stringConstraints = {
@@ -65,8 +70,15 @@ constants.stringConstraints = {
 
 constants.answerType = {
   PREDEFINED: 0,
-  EXTERNAL_SOURCE_WP_TITLES : 1,
-  EXTERNAL_SOURCE_WP_NEWS : 2
-}
+  EXTERNAL_SOURCE_WP_TITLES: 1,
+  EXTERNAL_SOURCE_WP_NEWS: 2,
+};
+
+constants.contentType = {
+  TITLES: 0,
+  NEWS: 1,
+};
+
+constants.FIXED_SUMMARY_LENGTH = 3;
 
 module.exports = constants;

backend/helpers/externalSource.js

@@ -1,5 +1,8 @@
 let request = require ('request');
 let Parser = require ('rss-parser');
+let summarizer = require ('nodejs-text-summarizer');
+var htmlToText = require ('html-to-text');
+const constants = require ('../config/constants');
 
 let parser = new Parser ();
 
@@ -8,37 +11,102 @@ getDataFromWPJSON = function (sourceUrl, page = 1, maxPosts = 10) {
     var options = {
       method: 'GET',
       url: `${sourceUrl}/wp-json/wp/v2/posts`,
-      qs:{
-          page:page,
-          per_page:maxPosts
-      }
+      qs: {
+        page: page,
+        per_page: maxPosts,
+      },
     };
 
-    request (options, (error, response, body)=> {
+    request (options, (error, response, body) => {
       if (error) {
         reject (error);
       } else {
-        resolve(JSON.parse (body));
+        resolve (JSON.parse (body));
       }
     });
   });
-}
+};
 
-module.exports = {
-  getAnswerFromWP : function (sourceUrl){
-    //This function will extract needed data from JSON, which we got from getDataFromWPJSON
-    //At the moment, it's taking titles and creates answer
-    return new Promise((resolve,reject)=>{
-      getDataFromWPJSON(sourceUrl).then(rawData=>{
-        let result='';
-        rawData.forEach(post=>{
-          result += post.title.rendered + '<break time="300ms"/> '
-        });
-        resolve(result);
-      }).catch(err=>{
-        reject('Failed to get answer');
-      });
+summarizeText = function (text, length, clearText = true) {
+  let preparedText = text;
+  if (clearText) {
+    preparedText = htmlToText.fromString (text, {
+      wordwrap: false,
+      ignoreHref: true,
+      ignoreImage: true,
     });
   }
-}
 
+  return summarizer (preparedText, {n: length});
+};
+
+getTitlesFromWP = function (sourceUrl) {
+  return new Promise ((resolve, reject) => {
+    getDataFromWPJSON (sourceUrl)
+      .then (rawData => {
+        let result = '';
+        rawData.forEach (post => {
+          result +=
+            post.title.rendered +
+            `<break time="${constants.voiceResponseTimings.PAUSE_BETWEEN_TITLES}ms"/> `;
+        });
+        resolve (result);
+      })
+      .catch (err => {
+        reject (constants.voiceResponseStrings.ERROR_FETCHING_CONTENT);
+      });
+  });
+};
+
+getLatestNewsFromWP = function (
+  sourceUrl,
+  postCount = 10,
+  includeTitle = false
+) {
+  return new Promise ((resolve, reject) => {
+    getDataFromWPJSON (sourceUrl, 1, postCount)
+      .then (rawData => {
+        let result = '';
+        let htmlToTextOptions = {
+          wordwrap: false,
+          ignoreHref: true,
+          ignoreImage: true,
+        };
+
+        try {
+          rawData.forEach (post => {
+            result += includeTitle ? post.title.rendered : '';
+            result += includeTitle
+              ? `<break time="${constants.voiceResponseTimings.PAUSE_BETWEEN_TITLE_AND_CONTENT}ms"/>`
+              : '';
+            result += summarizeText (
+              post.content.rendered,
+              constants.FIXED_SUMMARY_LENGTH
+            );
+            result += `<break time="${constants.voiceResponseTimings.PAUSE_BETWEEN_NEWS}ms"/>`;
+          });
+
+          resolve (result);
+        } catch (err) {
+          reject (constants.voiceResponseStrings.ERROR_SUMMARIZING_CONTENT);
+        }
+      })
+      .catch (err => {
+        reject (constants.voiceResponseStrings.ERROR_FETCHING_CONTENT);
+      });
+  });
+};
+
+module.exports = {
+  getAnswerFromWP: function (sourceUrl, contentType) {
+    //This function will extract needed data from JSON, which we got from getDataFromWPJSON
+    switch (contentType) {
+      case constants.contentType.TITLES:
+        return getTitlesFromWP (sourceUrl);
+        break;
+      case constants.contentType.NEWS:
+        return getLatestNewsFromWP (sourceUrl);
+        break;
+    }
+  },
+};

backend/models/alexa.js

@@ -76,30 +76,45 @@ module.exports = {
 
             let answerPromiseProps = {
               resolve: null,
-              reject: null
-            }
+              reject: null,
+            };
 
             let answerPromise = new Promise ((resolve, reject) => {
               answerPromiseProps = {
-                resolve:resolve,
-                reject:reject
-              }
+                resolve: resolve,
+                reject: reject,
+              };
             });
-            
-            switch (intent.answerType){
+
+            switch (intent.answerType) {
               case constants.answerType.PREDEFINED:
-                answerPromiseProps.resolve(intent.answer);
+                answerPromiseProps.resolve (intent.answer);
                 break;
               case constants.answerType.EXTERNAL_SOURCE_WP_TITLES:
-                predefinedSourceHelper.getAnswerFromWP(intent.externalAnswerSource).then(answer=>{
-                  answerPromiseProps.resolve(answer);
-                }).catch(error=>{
-                  answerPromiseProps.reject(error);
-                });
+                predefinedSourceHelper
+                  .getAnswerFromWP (
+                    intent.externalAnswerSource,
+                    constants.contentType.TITLES
+                  )
+                  .then (answer => {
+                    answerPromiseProps.resolve (answer);
+                  })
+                  .catch (error => {
+                    answerPromiseProps.reject (error);
+                  });
                 break;
               case constants.answerType.EXTERNAL_SOURCE_WP_NEWS:
-                answer = 'Not implemented yet'
-                answerPromiseProps.resolve(answer);
+                predefinedSourceHelper
+                  .getAnswerFromWP (
+                    intent.externalAnswerSource,
+                    constants.contentType.NEWS
+                  )
+                  .then (answer => {
+                    answerPromiseProps.resolve (answer);
+                  })
+                  .catch (error => {
+                    answerPromiseProps.reject (error);
+                  });
                 break;
             }
 

backend/package.json

@@ -8,9 +8,10 @@
     "body-parser": "^1.13.1",
     "ejs": "^2.5.7",
     "express": "^4.13.0",
+    "html-to-text": "^4.0.0",
     "isomorphic-fetch": "^2.2.1",
     "mongodb": "^2.2.33",
-    "nodejs-text-summarizer": "^2.0.3",
+    "nodejs-text-summarizer": "GotPPay/nodejs-text-summarizer",
     "nodemailer": "^4.4.1",
     "request": "^2.83.0",
     "rss-parser": "^3.1.1"