Added support for reddit preview fallback.

src/methods/imgurAlbum.js

@@ -11,7 +11,7 @@ function imgurAlbum(post) {
         }
     }).then(res => res.json()).then(res => {
         if(res.status !== 200) {
-            throw new Error(`Could not fetch info for imgur album '${post.host.id}': ${res.data.error}`);
+            throw new Error(`Could not fetch info for imgur album '${post.host.id}': '${res.data.error}'`);
         }
 
         const extract = config.library.album.extractSingleItem && res.data.images.length === 1;

src/methods/imgurImage.js

@@ -11,7 +11,7 @@ function imgurImage(post) {
         }
     }).then(res => res.json()).then(res => {
         if(res.status !== 200) {
-            throw new Error(`Could not fetch info for imgur image '${post.host.id}': ${res.data.error}`);
+            throw new Error(`Could not fetch info for imgur image '${post.host.id}': '${res.data.error}'`);
         }
 
         return {

src/methods/methods.js

@@ -3,6 +3,7 @@
 const self = require('./self.js');
 const redditImage = require('./redditImage.js');
 const redditVideo = require('./redditVideo.js');
+const redditPreview = require('./redditPreview.js');
 const imgurImage = require('./imgurImage.js');
 const imgurAlbum = require('./imgurAlbum.js');
 const gfycat = require('./gfycat.js');
@@ -12,6 +13,7 @@ module.exports = {
     self,
     redditImage,
     redditVideo,
+    redditPreview,
     imgurImage,
     imgurAlbum,
     gfycat,

src/methods/redditPreview.js

@@ -0,0 +1,40 @@
+ 'use strict';
+
+const util = require('util');
+const config = require('config');
+const path = require('path');
+const fetch = require('node-fetch');
+const urlPattern = require('url-pattern');
+
+const extensions = require('../extensions.json');
+
+function reverseLookup(extension) {
+    return Object.keys(extensions).find(mime => extensions[mime] === extension);
+};
+
+function redditPreview(post) {
+    return Promise.resolve({
+        album: post.preview.length > 1 ? {
+            id: post.host.id || post.id,
+            url: post.url,
+            title: post.title,
+            datetime: post.datetime,
+            original: post
+        } : null,
+        items: post.preview.map(image => {
+            const urlComponents = new urlPattern('http(s)\\://i.redditmedia.com/:id(.:ext)(?*)').match(image.url);
+
+            return {
+                id: post.host.id || post.id,
+                url: image.url,
+                title: post.title,
+                datetime: post.datetime,
+                type: reverseLookup(`.${urlComponents.ext}`),
+                preview: true,
+                original: post
+            };
+        })
+    });
+};
+
+module.exports = redditPreview;