Develop Reference

TinyMCE detect remote image dragged-in or uploaded

As documented, TinyMCE allows uploading images automatically: one defines an endpoint (images_upload_url), which is expected to upload the image and return the location for TinyMCE to use in markup.
However, when pasting, dragging or inserting an image from a URL — for example, https://somecdn.com/image.png — TinyMCE will simply embed the image tag with the somecdn.com source, instead of sending the URL to images_upload_url to be uploaded.
I've scoured through the docs here and haven't found any way to configure TinyMCE to do this. Is there a method I can override in order to upload images from URLs as well as local image uploads?
Summary
To clarify:
Current behavior with local image dragged in: TinyMCE sends the image to the URL specified in images_upload_url, then embeds the source returned.
Current behavior with remote image dragged in: TinyMCE embeds the remote image, sourced with its remote URL.
Desired behavior with remote image dragged in, similar to well established products like Microsoft's GroupMe: TinyMCE sends the image URL to the URL specified in images_upload_url, then embeds the source returned. I can figure out how to upload the URL & manually embed the image in TinyMCE, but I need to know what event to intercept to get the dragged-in image URL!

With some tinkering, I was able to figure out how to handle remote images in TinyMCE!
As I'm using TinyMCE with React, I added an onDrop event:
<Editor
onDrop={onDrop}
And here is my method implementation, with comments:
const onDrop = useCallback((e) => {
const image_url = e.dataTransfer.getData("URL");
/*
If this is a local file, use the default functionality
provided using images_upload_url
*/
if (!image_url) {
return;
}
/*
Otherwise, intercept the drop event, get the file URL,
send it to the API to be uploaded, then embed in content
*/
e.preventDefault();
filesAPI
.upload({
image_url,
})
.then((response) => {
const { location } = response.data;
editorRef.current.execCommand(
"mceInsertContent",
false,
`<img src='${location}' />`
);
});
return false;
}, []);
The implementation seems to work pretty well! When local images are dropped in, they're processed by the default handler; otherwise the onDrop method uploads the images & inserts a tag with their location. Note that filesAPI in this context is just my app's wrapper around an axios fetch call.

What you are wanting to do is not technically possible for a great many "remote" images as most sites won't have the appropriate CORS headers in place to allow for what you want to happen. You can fetch/proxy the image via some server side code and then do whatever you want with it once it is fetched server side.
All that being said you also enter a slippery slope of "taking" someone else's intellectual property and storing/serving it from your server which in many cases would be against copyright laws.
EDIT (based on your comments):
The images_upload_url feature is not designed to do what you want it to do. It is not that you cannot do what you are describing but images_upload_url won't do that for you. You can try to use some of TinyMCE's events to capture content insertion and trigger that sort of behavior or you could simply wait for the content to be saved to the server and perform that processing when the content is prepared for saving to your data store.
There are a whole host of events that TinyMCE provides along with some of the standard browser events:
https://www.tiny.cloud/docs/advanced/events/#handlingeditorevents

Ckeditor uploadimage 404 error / plugin setup

I'm trying to add the adding of images into with the editor, with drag 'n drop.
I wanted to update CK editor anyway, so after some reading I created a new CKeditor download via the package building, including the plugin uploadimage -
http://ckeditor.com/addon/uploadimage
When I try to drag 'n drop an image in it, I'll see a green bar saying upload succesful and for less then a second I see the image in the editor.
Then a red bar is showing. saying:
'HTTP error occurred during file upload (404: File not found).'
I have this in the ckeditor config.js:
config.uploadUrl = '/upload/';
As I assumed this was the path were the images are uploaded. The folder is created and for testing I have set its permissions to 777.
As this is not working I assume I did something wrong here, or that I'm missing something in the configuration. But via the documentation I don't see what it might be.
I hope someone can point me in the right direction.
On a side note, I do not need/want a file browser. A little context -> this editor will be used by logged in users. I do not want one user be able to see images from the other and the input text in only used once, so no need to find earlier images as for this particular use the user will only use this editor once for setup. This is why I tought the uploadimage plugin would fit best for my needs.
Kind regards,
Martijn

Based on the documentation of ckeditor:
The uploadUrl setting contains the location of a script that handles file uploads of pasted and dragged images
This is not the folder in your server that you want to upload the files to. This should be the script that handles the submit of the file that should be uploaded, and this script is the one who handle the saving of the file in the relevant folder on the server.
This plugin only covers the client side (what happen in the browser) and not the server side (which you need to implement by yourself).

Sitecore Pipeline Upload Processor

I'm using UploadProcessor to block specific file uploading into MediaLibrary.
Everything is working good and I can see the alert Sitecore's message. But, Sitecore's error message is not really user-friendly "One or more files could not be uploaded. See the Log file for more details"
So, I'd like to add extra alert box for users. Below is my code, but the javascript is not working.
Some people want me to use "SheerResponse", but Sitecore Document mentions that
The uiUpload pipeline is run not as part of the Sheer event, but as part of the form loading process in response to a post back. This is because the uploaded files are only available during the “real” post back, and not during a Sheer UI event. In this sense, the uiUpload pipeline has not been designed to provide UI. In order to provide feedback to a User, the processor should resort to some trick which emits the JScript code.
http://sdn.sitecore.net/Articles/Media/Prevent%20Files%20from%20Uploading/Pipeline%20upload.aspx
Do you have any idea how to implement alert box??

The Upload control in the Media Library uses flash to upload the files. As part of this upload process, the file sizes are checked using JavaScript and a client side validation is made before the upload.
There are a number of changes you need to make. I'm just going to list them here, you can find all the code in my Github Gists:
https://gist.github.com/jammykam/54d6af46593fa3b827b4
1) Extend and update the MediaFolder.js file to check the file size against the Image Size ONLY if the extension is one specified in config
if (file.size > this.uploadLimit() || this.uploadImageLimitReached(file)) {
...
}
2) Update MediaFolder.xml page to include the above JS. Amend the codebeside, inheriting from Sitecore.Shell.Applications.Media.MediaFolder.MediaFolderForm and overriding OnLoad and OnFilesCancelled, to render restricted extensions and max image size settings so these are passed to the Javascript and display friendly alert.
settings.Add("uploadImageLimit", ((long)System.Math.Min(ImageSettings.MaxImageSizeInDatabase, Settings.Runtime.EffectiveMaxRequestLengthBytes)).ToString());
settings.Add("uploadImageRestrictedExtensions", ImageSettings.RestrictedImageExtensions);
3) Update Attach.xaml.xml codebeside to check image size, inheriting from Sitecore.Shell.Applications.FlashUpload.Attach.AttachPage and overriding OnQueued method:
if (ImageSettings.IsRestrictedExtension(filename) && num > maximumImageUploadSize)
{
string text = Translate.Text("The image \"{0}\" is too big to be uploaded.\n\nThe maximum image size that can be uploaded is {1}.", new object[] { filename, MainUtil.FormatSize(maximumImageUploadSize) });
this.WarningMessage = text;
SheerResponse.Alert(text, new string[0]);
}
else
{
base.OnQueued(filename, lengthString);
}
4) Add a config include with the new settings.
<setting name="Media.MaxImageSizeInDatabase" value="1MB" />
<setting name="Media.RestrictedImageExtensions" value=".jpg|.jpeg|.png|.gif|.bmp|.tiff" />
You can still (and should) keep the pipelines in place, but note from my previous answer I gave the "Restricted Extension" config setting has now changed (into a single setting instead of passing it into the pipeline). The Gist contains the
NOTE that I have tested this using Sitecore 7.2 rev 140526, so the base code is taken from there. If you are using a different version then you should check the base C#, JS and XML code matches what I have provided. The code is commented to show you what has changed.
The above works in the Content Editor, it does not work in the Page Editor! Which in Sitecore 7.2+ uses SPEAK dialogs and it looks like they use a different set of pipelines. That would need more investigation (raise another question, and specify which version of Sitecore you are using).

Upload/download/save image to a local server from a remote server using an Image URL and PHP?

I am building a Discussion Forum as part of a bigger application I am building, the forum is just 1 section of the Application.
For my TextArea fields when posting a new Topic or a Post Reply, I have decided that nothing is as good as the PageDown Markdown Library. It is the same one that StackOverflow uses on all their sites and it works better than many of it's competitors.
The way the library ships though, I am not happy with the default Insert Image functionality. You hit the button to insert an image and it allows you to enter a URL for an Image and then it inserts the proper MarkDown syntax to show the linked image.
This just won't cut it. I need the functionality that you see on StackOverflow! Very similar anyways.
I need it to show a Dialog when you click the Insert Image button, like it does now, but instead of just an input field for a Image URL, it will have 2 filed options...
Upload image from your computer
Insert an Image URL and it will then DOWNLOAD the image from that URL and insert it into the post just as if you had uploaded it from your computer. This is important to not confuse this step. IT should not simply insert the Image linking it to the original Image URL. Instead it will take that URL and download/upload the Image to the same server that the upload from computer option does and then it will insert the NEW Image URL pointing to the newly uploaded image!
Based on some simple HTML like below for a Dialog window with a filed for my Upload from Computer functionality, which I already have working. I need to come up with some JavaScript and PHP that will download/save a remote image to my upload folder on my server when a button is clicked using only the URL that will be inside the URL text input field.
So it will need to do a few things...
Fetch and save an image file to my uploads folder using PHP when the only thing that the PHP function will receive is a URL of the image which could be on the same server or most likely a remote server.
After successfully saving/uploading an image from the URL, the PHP function will return a JSON string with the status/error and if successful then it will also return the actual URL and filename of where the new image is saved on the local server. The JavaScript/AJAX script will receive this JSON response and insert the Markdown syntax for the image into the PageDown editor.
The PHP function will need to ensure that the URL that it is trying to save/download is a valid image file and not some malicious file! Also not simply just some file of the wrong filetype like a non-image file unless we are allowing the file type.
It will be part of a module installed on many dinosaur servers so it needs to work on as many servers as possible too!
From the web
From your computer
I would be greatful of any help, tips, code snippets or anything to help with this. At this stage I really just need to build a nie PHP function that will upload images from a remote URL and also ensure that the URL passed in is a real image file or even better that it is in the allowed file types array!
A couple years ago I had started this but have now lost it and I am starting over and don't remeber much about how I went about doing it then.

The easiest way to download a file from a remote server would be to use copy (http://php.net/manual/en/function.copy.php):
copy('http://someurl.com/image.png', '/var/www/uploads/image.png');
As this function returns a bool, it is easy to determine whether the operation was successful and create a JSON response.
To verify that the file is an actual image, there is unfortunately no way that is 100% sure. It is probably enough to check the mimetype though. You can use finfo for that (http://php.net/manual/en/function.finfo-file.php):
$finfo = finfo_open(FILEINFO_MIME_TYPE);
echo finfo_file($finfo, $filename);
finfo_close($finfo);
For a gif, this would return image/gif for example. You will have to hardcode a list of all mimetypes you want to allow.

Get binary image data from input type "file" using JavaScript/jQuery for use with picture preview with AJAX in WebMatrix [duplicate]

This question already has answers here:
Closed 10 years ago.
I have had trouble when researching or otherwise trying to figure out how (if it's even possible) to get binary image data using JavaScript/jQuery from an html input element of type file.
I'm using WebMatrix (C#), but it may not be necessary to know that, if the purposes of this question can be answered using JavaScript/jQuery alone.
I can take the image, save it in the database (as binary data), then later show the pic on the page, from the binary data, after posting. This does, however, leave me without a pic preview, before uploading, for which I am almost certain I must use AJAX.
Again, this may not even be possible, but as long as I can get the binary image data, I believe I can push it to the server with AJAX and process the image the same way I would if I were taking it from a database (note that I don't save the image files themselves using GUID and all that,I just save the binary data).
If there is an easier way to show a pic preview using the input element, that would work fine, too, of course, as the whole idea behind me trying to do this is to show a pic preview before they hit the submit form button (or at least create that illusion).
**********UPDATE***********
I do not consider this a duplicate of another question because, my real question is:
How can I get image data from an input type "file", with JavaScript/jQuery?
If I can just get the data (in the right format) back to the server, I should be able to work with it there, and then return it with AJAX (although, I am absolutely no AJAX expert).
There is, according to the research that I have done, NO WAY to get picture previews in all IE versions using only javascript (this is because getting the full file path is seen, by them, as a potential security risk). I could ask my users to add the site to the trusted sites, but you don't usually ask users to tamper with those kinds of settings (not to mention the quickest way to make your site seem suspicious to users is to ask them to directly add your site to the trusted sites list. That's like sending an email and asking for a password. "Just trust me! I'm soooo safe!" :)

Short answer: Use the jQuery form plugin, it suports AJAX-like form submits even for file uploads.
tl;dr
Thumbnail preview is popular websites is usually done by a number of steps, basically the website do these steps:
upload the RAW image
Resize and optimise the image for data storage
Generate a temporary link to that file (usually stored in a server maintained HTTP session)
Send it back to the user, to enable a 'preview'
Actually store the image after user confirms the image
A few bad solutions are:
Most of the modern browsers has options to enable script access to local files, but usually you don't ask your users to tinker with those low level settings.
Earlier Internet Explorer (ah... yes it's a shame) and ancient versions of modern browsers will expose the full file path by reading the 'value' of file input box, which you can directly generates an tag and use that value. (Now it is replaced by some c:/fakepath/... thing.)
Use Adobe Flash to mimic the file selection panel, it can properly read local files. But passing it into JavaScript is another topic...
Hope these helps. ;)
UPDATE
I actually came across a situation that requires a preview before uploading, I'd like to also put it here. As I could recall, there were no transitional versions in modern browsers that do not implement FileReader before masking the real file path, but feel free to correct me if so. This solution should caters most of the browsers, as long as they are supported by jQuery.
// 1. Listen to change event
$(':file').change(function() {
// 2. Check if it has the FileReader class
if (!this.files) {
// 2.1. Old enough to assume a real path
setPreview(this.value);
}
else {
// 2.2. Read the file content.
var reader = new FileReader();
reader.onload = function() {
setPreview(reader.result);
};
reader.readAsDataURL();
}
});
function setPreview(url) {
// Do preview things.
$('.preview').attr('src', url);
}