Canvas API apparently doesn't like big images

[David Jones]

Word docx appears to bork at big images (e.g. first learning module from 1499EDN).

They just disappear -- when converted to HTML this is working, but when added to Canvas, it disappears

Cause is due to Canvas RCE deleteing base64 content

• is there an error being generated and which can be handled?
• is there a limit on the API
• is there a workaround for the limit
• ??? if not, what's the solution - warning, create image??

Solution

• Use Javascript to upload file
• Figure out python to upload a file

[David Jones]

Converting base64 images into files saved on Canvas files area

Keep Mammoth base64 images as is in WordConverter. Creating the module would need to

• detect any base64 images
• Convert to images and save to Canvas files
• UPdate the html to point to the URLs of the image files that were saved

The image URL is the full file url with "/preview" on the end

[David Jones]

Uploading a file via Canvas API

• ucfopen/canvaspi upload class
• OIT canvas git - docs/examples using CURL to explain the uploading files process - but uses a file on the file structure
• Canvas Dev and Friends - has ]lesson on file uploads](https://canvas.instructure.com/courses/785215/assignments/2241276?module_item_id=4783530)

ufcopen/canvasapi

This works fine it's process is

• start - open the file into python file handle
• request_upload_token
  • makes POST request to URL
  • "name" and "size" are the parameters
• upload
  • passed the response from request_upload_token
  • checks response for "upload_url" and "upload_params" if not there - there's an error
  • generates a new request using the upload_url and the upload_params

[David Jones]

Implement trial run

• Create HTML page with javascript in it that communicates with Canvas API
• Get it to upload a text file
• Get it to upload a base64 image