Add method to fetch remote image with AssetsInliner

lib/output/assets-inliner.js

@@ -3,7 +3,12 @@ var util = require('util');
 var path = require('path');
 
 var FolderOutput = require('./folder');
+var Promise = require('../utils/promise');
+var fs = require('../utils/fs');
 var imagesUtil = require('../utils/images');
+var location = require('../utils/location');
+
+var DEFAULT_ASSETS_FOLDER = 'assets';
 
 /*
 Utility mixin to inline all the assets in a book:
@@ -32,19 +37,45 @@ AssetsInliner.prototype.onOutputSVG = function(page, svg) {
 };
 
 // Output an image as a file
-AssetsInliner.prototype.onOutputImage = function(page, imgFile) {
-    if (path.extname(imgFile).toLowerCase() != '.svg') {
-        return imgFile;
+AssetsInliner.prototype.onOutputImage = function(page, src) {
+    var that = this;
+    var isSVG = false;
+    var ext = path.extname(src).toLowerCase();
+    if (ext == '.svg') {
+        isSVG = false;
+        ext = '.png';
     }
 
-    // Convert SVG to PNG
-    var filename = _.uniqueId('svg_') + '.png';
-    return imagesUtil.convertSVGToPNG(page.resolve(imgFile), this.resolve(filename))
+    return Promise()
 
-        // Return relative path from the page
-        .thenResolve(function() {
-            return page.relative('/' + filename);
-        });
+    // Allocate a new file
+    .then(function() {
+
+        return that.
+    })
+
+    // Download file if external
+    .then(function() {
+        if (!location.isExternal(src)) return;
+
+        return fs.download(src, )
+
+    })
+    .then(function() {
+        if (path.extname(src).toLowerCase() != '.svg') {
+            return src;
+        }
+
+        // Convert SVG to PNG
+        var filename = _.uniqueId('svg_') + '.png';
+        return imagesUtil.convertSVGToPNG(page.resolve(src), this.resolve(filename))
+            .thenResolve('/' + filename);
+    })
+
+    // Return relative path from the page
+    .thenResolve(function(filename) {
+        return page.relative('/' + filename);
+    });
 };
 
 

lib/output/base.js

@@ -106,9 +106,9 @@ Output.prototype.onOutputSVG = function(page, svg) {
 };
 
 // Output an image as a file
+// Normalize the relative link
 Output.prototype.onOutputImage = function(page, imgFile) {
-    // Don't replace it
-    return imgFile;
+    return page.relative(imgFile);
 };
 
 // Finish the generation

lib/output/folder.js

@@ -74,5 +74,11 @@ FolderOutput.prototype.writeFile = function(filename, buf) {
     });
 };
 
+// Create a new unique file
+// Returns its filename
+FolderOutput.prototype.createNewFile = function(base, filename) {
+
+};
+
 
 module.exports = FolderOutput;

lib/utils/fs.js

@@ -2,6 +2,8 @@ var fs = require('graceful-fs');
 var mkdirp = require('mkdirp');
 var destroy = require('destroy');
 var tmp = require('tmp');
+var request = require('request');
+var path = require('path');
 
 var Promise = require('./promise');
 
@@ -59,6 +61,28 @@ function genTmpFile(opts) {
         .get(0);
 }
 
+// Download an image
+function download(uri, dest) {
+    return writeStream(dest, request(uri));
+}
+
+// Find a filename available in a folder
+function uniqueFilename(base, filename) {
+    var ext = path.extname(filename);
+    filename = path.resolve(base, filename);
+    filename = path.join(path.dirname(filename), path.basename(filename, ext));
+
+    var _filename = filename+ext;
+
+    var i = 0;
+    while (fs.existsSync(filename)) {
+        _filename = filename + '_' + i + ext;
+        i = i + 1;
+    }
+
+    return path.relative(base, _filename);
+}
+
 module.exports = {
     exists: fileExists,
     existsSync: fs.existsSync,
@@ -70,5 +94,7 @@ module.exports = {
     readdir: Promise.nfbind(fs.readdir),
     writeStream: writeStream,
     copy: copyFile,
-    tmpFile: genTmpFile
+    tmpFile: genTmpFile,
+    download: download,
+    uniqueFilename: uniqueFilename
 };

package.json

@@ -32,7 +32,7 @@
         "crc": "3.2.1",
         "bash-color": "0.0.3",
         "urijs": "1.17.0",
-        "request": "2.51.0",
+        "request": "2.69.0",
         "npm": "2.4.1",
         "dom-serializer": "0.1.0",
         "spawn-cmd": "0.0.2",

test/assets-inliner.js

@@ -47,5 +47,9 @@ describe('Assets Inliner Output', function() {
             output.should.have.file(src);
         });
     });
+
+    describe('Remote Assets', function() {
+
+    });
 });