From 075f1b5df4ce5df11848c5100f0e12719dbdba27 Mon Sep 17 00:00:00 2001
From: "Sam X. Chen" <sam.xi.chen@gmail.com>
Date: Mon, 15 Jul 2019 10:25:16 -0400
Subject: Add Feature: allow to shrink attached/pasted image if server has
 correponding settings

---
 client/components/cards/attachments.js | 125 +++++++++++++++++++++++++++++----
 1 file changed, 113 insertions(+), 12 deletions(-)

(limited to 'client/components/cards/attachments.js')

diff --git a/client/components/cards/attachments.js b/client/components/cards/attachments.js
index 6b3e38a5..f536a655 100644
--- a/client/components/cards/attachments.js
+++ b/client/components/cards/attachments.js
@@ -54,7 +54,7 @@ Template.previewAttachedImagePopup.events({
 Template.cardAttachmentsPopup.events({
   'change .js-attach-file'(event) {
     const card = this;
-    FS.Utility.eachFile(event, f => {
+    const processFile = f => {
       const file = new FS.File(f);
       if (card.isLinkedCard()) {
         file.boardId = Cards.findOne(card.linkedId).boardId;
@@ -66,7 +66,6 @@ Template.cardAttachmentsPopup.events({
         file.cardId = card._id;
       }
       file.userId = Meteor.userId();
-
       const attachment = Attachments.insert(file);
 
       if (attachment && attachment._id && attachment.isImage()) {
@@ -74,6 +73,42 @@ Template.cardAttachmentsPopup.events({
       }
 
       Popup.close();
+    };
+
+    FS.Utility.eachFile(event, f => {
+      if (
+        MAX_IMAGE_PIXEL > 0 &&
+        typeof f.type === 'string' &&
+        f.type.match(/^image/)
+      ) {
+        // is image
+        const reader = new FileReader();
+        reader.onload = function(e) {
+          const dataurl = e && e.target && e.target.result;
+          if (dataurl !== undefined) {
+            shrinkImage({
+              dataurl,
+              maxSize: MAX_IMAGE_PIXEL,
+              ratio: COMPRESS_RATIO,
+              toBlob: true,
+              callback(blob) {
+                if (blob === false) {
+                  processFile(f);
+                } else {
+                  blob.name = f.name;
+                  processFile(blob);
+                }
+              },
+            });
+          } else {
+            // couldn't process it let other function handle it?
+            processFile(f);
+          }
+        };
+        reader.readAsDataURL(f);
+      } else {
+        processFile(f);
+      }
     });
   },
   'click .js-computer-upload'(event, templateInstance) {
@@ -83,30 +118,96 @@ Template.cardAttachmentsPopup.events({
   'click .js-upload-clipboard-image': Popup.open('previewClipboardImage'),
 });
 
+const MAX_IMAGE_PIXEL = Meteor.settings.public.MAX_IMAGE_PIXEL;
+const COMPRESS_RATIO = Meteor.settings.public.IMAGE_COMPRESS_RATIO;
 let pastedResults = null;
+const shrinkImage = function(options) {
+  // shrink image to certain size
+  const dataurl = options.dataurl,
+    callback = options.callback,
+    toBlob = options.toBlob;
+  let canvas = document.createElement('canvas'),
+    image = document.createElement('img');
+  const maxSize = options.maxSize || 1024;
+  const ratio = options.ratio || 1.0;
+  const next = function(result) {
+    image = null;
+    canvas = null;
+    if (typeof callback === 'function') {
+      callback(result);
+    }
+  };
+  image.onload = function() {
+    let width = this.width,
+      height = this.height;
+    let changed = false;
+    if (width > height) {
+      if (width > maxSize) {
+        height *= maxSize / width;
+        width = maxSize;
+        changed = true;
+      }
+    } else if (height > maxSize) {
+      width *= maxSize / height;
+      height = maxSize;
+      changed = true;
+    }
+    canvas.width = width;
+    canvas.height = height;
+    canvas.getContext('2d').drawImage(this, 0, 0, width, height);
+    if (changed === true) {
+      const type = 'image/jpeg';
+      if (toBlob) {
+        canvas.toBlob(next, type, ratio);
+      } else {
+        next(canvas.toDataURL(type, ratio));
+      }
+    } else {
+      next(changed);
+    }
+  };
+  image.onerror = function() {
+    next(false);
+  };
+  image.src = dataurl;
+};
 
 Template.previewClipboardImagePopup.onRendered(() => {
   // we can paste image from clipboard
-  $(document.body).pasteImageReader(results => {
+  const handle = results => {
     if (results.dataURL.startsWith('data:image/')) {
-      $('img.preview-clipboard-image').attr('src', results.dataURL);
-      pastedResults = results;
+      const direct = results => {
+        $('img.preview-clipboard-image').attr('src', results.dataURL);
+        pastedResults = results;
+      };
+      if (MAX_IMAGE_PIXEL) {
+        // if has size limitation on image we shrink it before uploading
+        shrinkImage({
+          dataurl: results.dataURL,
+          maxSize: MAX_IMAGE_PIXEL,
+          ratio: COMPRESS_RATIO,
+          callback(changed) {
+            if (changed !== false && !!changed) {
+              results.dataURL = changed;
+            }
+            direct(results);
+          },
+        });
+      }
     }
-  });
+  };
+
+  $(document.body).pasteImageReader(handle);
 
   // we can also drag & drop image file to it
-  $(document.body).dropImageReader(results => {
-    if (results.dataURL.startsWith('data:image/')) {
-      $('img.preview-clipboard-image').attr('src', results.dataURL);
-      pastedResults = results;
-    }
-  });
+  $(document.body).dropImageReader(handle);
 });
 
 Template.previewClipboardImagePopup.events({
   'click .js-upload-pasted-image'() {
     const results = pastedResults;
     if (results && results.file) {
+      window.oPasted = pastedResults;
       const card = this;
       const file = new FS.File(results.file);
       if (!results.name) {
-- 
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