Link to plugin page: https://zeroqode.com/plugin/aws-file-uploader-1533465056312x784389392881156100​

Introduction

AWS File Uploader Plugin is a powerful tool, that allows you or your users to upload files from Bubble apps directly to your AWS (Amazon Web Services) S3 Bucket without any file size limits.

Plugin comes with the multi-file uploader element as well as S3 objects element that returns a list of all the files uploaded to your AWS S3 bucket or a special folder on that bucket. The plugin also allows you to delete S3 objects from your bucket.

Each uploaded file has its own visual progress bar, so you or your users can see the upload progress. Plugin will also return a state with file URL(s), file size(s), last modified date(s), etc.

Prerequisites:

To run this plugin you need the following to set it up on AWS side:

1. AWS account

You can create the AWS account for free, just by visiting the following link:

​ https://aws.amazon.com/console/​

2. AWS Cognito Identity account

To create the AWS Cognito Identity, please follow the instructions below:

Now create IAM Roles for Cognito Identity (the values from inputs can be changed):

Once you have Created the IAM Roles, you will get the identity pool ID which will be used in the plugin settings(shown in red on the screenshot below)

3. IAM Security Roles

In Your IAM Dashboard, you will find two new roles:

You can edit policy details by clicking the "Edit policy" button to much desired requirements, please be sure to check AWS's documentation on this one.

By clicking each role name you will open the role settings, where you need to replace the default policy with the following lines* :

{
   "Version": "2012-10-17",
   "Statement": [
       {
           "Effect": "Allow",
           "Action": [
               "cognito-sync:*",
               "cognito-identity:*",
               "S3:*"
           ],
           "Resource": [
               "*"
           ]
       }
   ]
}

* If necessary, you can set your own rules to make your application more secure, check AWS's documentation for more details.

4. AWS S3 Bucket located on the desired Server

You can manage your S3 storage using the link below:

To create a new S3 Bucket, click the “Create Bucket” Button and follow the instructions.

The name and Region you choose on the first screen will then be used in plugin setup.

You need to set the S3 Bucket available to the public, so everyone can view your files.

Additional Security:

Add additional security to your AWS bucket by configuring policies on 'Permissions' tab:

In the next steps we'll show you how to set Access Control, Bucket Policy and CORS policy to get started with basic security restrictions.

1. In the 'Block public access' area unlock public access to all for time being.

2. In the 'Bucket Policy' area you can configure the rules for security and privacy via Bucket Policy. Take a look at the "Action", "Resource" and "Condition" fields where we grant access for reading the objects from our bucket. In this case, we are granting read file access only to users from our application domain, so if a user gets an image URL and tries to open it in a new tab or a new window, the bucket policy will block this request because we stated in the privacy rules that the link can be opened only from our domain:

Here's a code example (jSON):

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "AddPerm",
            "Effect": "Allow",
            "Principal": "*",
            "Action": "s3:GetObject",            
            "Resource": "arn:aws:s3:::YOUR-BUCKET-NAME/*",
            "Condition": {
                "StringLike": {
                    "aws:Referer": "https://zeroqode-demo-02.bubbleapps.io/*"
                }
            }
        },
        {
            "Sid": "AddPerm2",
            "Effect": "Allow",
            "Principal": "*",
            "Action": "*",
            "Resource": "arn:aws:s3:::YOUR-BUCKET-NAME/*"
        }
    ]
}

YOUR-BUCKET-NAME - should be your S3 bucket name (ex: zeroqodedemo02).

You can find more Bucket Policy examples here. Feel free to try out other rules in order to improve your bucket security.

3. In the Access control list (ACL) area make sure that all the options look like on the image below to match our configuration:

4. Use the 'Cross-origin resource sharing' area to configure CORS policy for S3 bucket.

To configure access from all domains, you can use the following JSON for CORS policy:

[
    {
        "AllowedHeaders": [
            "*"
        ],
        "AllowedMethods": [
            "GET",
            "PUT",
            "DELETE",
            "POST"
        ],
        "AllowedOrigins": [
            "*"
        ],
        "ExposeHeaders": [
            "ETag"
        ],
        "MaxAgeSeconds": 30000
    }
]

[
    {
        "AllowedHeaders": [
            "*"
        ],
        "AllowedMethods": [
            "GET",
            "PUT",
            "DELETE",
            "POST"
        ],
        "AllowedOrigins": [
            "https://yourdomain.com",
            "https://yourdomain.bubbleapps.io"
        ],
        "ExposeHeaders": [
            "ETag"
        ],
        "MaxAgeSeconds": 30000
    }
]

Example:

Here is an example of a successful image rendering in our application:

Trying to open the same image in another tab or window (incognito) by URL will now result in the following error as a restricted access to file:

How to Setup

On bubble side, in plugin settings.

Provide the S3 Bucket name, the region and the identity pool id in the plugin settings:

Plugin Elements Proprieties

The plugin has 3 visual elements: File uploader, S3 Objects and File Upload No GUI. In order to work with one of the elements, you have to add it to the page.

File uploader element

This element lets you easily upload files into your S3 Bucket using the User Interface.

Element properties:

1. Placeholder - default text description that will be displayed in the editor until there is something to preview

2. Max file size (mb) - maximum file size for each file (in MB)

3. Max timeout (s) - maximum time that the app will wait for a file to upload; if the file doesn't get uploaded during this time, the upload request will be canceled

4. Enable preview - checkbox; if checked, enables preview for the uploaded files

5. Create image thumbnails - checkbox; if checked, enables image thumbnail creation

6. Show remove/cancel button - checkbox; if checked, the Remove/Cancel button will appear for each of the uploaded files, so you can remove them

7. Folder structure - this defines the way the files are stored in the S3 bucket.

   Available values:

   "uuid_filename" - the Unique ID will be added to the file name;

   "uuid/filename" - the file will be added to a new folder that will have Unique ID as a name, while the file name will remain unchanged;

   "folder_name/uuid_filename" - the folder name indicated in the next property will be used, and the Unique ID will become part of the file name; if this value is selected, but the 'Folder name' property is not set or is set to a dynamic value that resolves to 'null', the folder name 'unknown' will be used

8. Folder name - folder name to be used for files upload; is used only if the above property is set to 'folder_name/uuid_filename'; if the folder name resolves to 'null', the name 'unknown' is used

9. Add prefix to filename - checkbox; if checked, file names will get custom prefixes to make it easier to locate them on S3 Bucket

10. Filenames prefix - custom prefix to add to file names; is applied only if the 'Add prefix to filename' checkbox is checked

11. Many files - checkbox; if checked, will allow users to upload multiple files at once

12. File extensions - used to specify allowed file extensions for the files to be uploaded to S3 bucket; to allow all file extensions, set it to 'all'

13. Thumbnail method - dropdown; available values: contain, crop.

    Method to be used when creating thumbnails; it defines how the overlapping parts of the image preview will be handled

14. Thumbnail width (px) - width of the image thumbnail (in px), to best fit your design

15. Thumbnail height (px) - height of the image thumbnail (in px), to best fit your design

16. Remove button caption - text that will be displayed on the Remove button

17. Cancel button caption - text that will be displayed on the Cancel button

18. Allow Image Cropping (Single File) - checkbox; if checked, will allow image cropping (use it only if Many Files checkbox is unchecked)

19. Aspect ratio - aspect ratio for cropping

20. Allow image processing - checkbox; if checked, will allow image processing

21. Image resize method - dropdown; available values: crop, contain.

    Method to be used when processing images

22. Image resize quality - dropdown; available values: 0.2,0.4,0.6,0.8,1

    Quality of the resized image

23. Image resize Height - resized image height

24. Image resize Width - resized image width

25. Crop if size is smaller than Image Resize Width or Height? - checkbox; if checked, will allow cropping even if the cropped image size is smaller than Image Resize Width or Height

26. Crop modal title - title of the Crop modal window

27. Crop Save Button Caption - text that will be displayed on the Save button in the Crop modal window

28. Crop Cancel Button Caption - text that will be displayed on the Cancel button in the Crop modal window

29. Initial Value - file to be uploaded to AWS initially, when the page with the plugin loads (optional)

Element actions:

1. Reset input - used to reset the user input in the uploader

Element events:

1. an error occurred - is triggered when an error occurs

2. uploading is finished - is triggered when file uploading is finished

3. initial value is set - is triggered if the initial value is set for this uploader element

Element states:

1. File URL - URL of the uploaded file

2. List of file URL - list of uploaded files URLs

3. File Name - name of the uploaded file

4. List of file names - list of uploaded files names

5. File size (KB) - uploaded file size (in KB)

6. List of files sizes (KB) - list of uploaded file sizes (KB)

7. Progress of files upload (%) - progress of the total file upload

8. Upload progress of current file - progress of the current file upload

9. Images Width - width of the image (only for image files)

10. Images Height - height of the image (only for image files)

11. Too Big Files Names - names of the files that are too big for the current upload

12. Cropped image width - width of the cropped image (only if cropping is allowed)

13. Cropped image height - height of the cropped image (only if cropping is allowed)

14. Initial Value URL - URL of the file set as the plugin element Initial Value

15. Error message - error message in case of an error

File Upload No GUI element

This element lets you easily upload files into your S3 Bucket without a graphical user interface but should be placed on page in order to interact :

Element properties:

1. Title - title of the File Upload No GUI element

2. Unique file prefix format - dropdown; available values: uuid_, zq_random

   The unique prefix format you want to be used when adding a unique id to the file names when they are uploaded to the bucket.

Element actions:

1. Upload File - is used to upload a file.

Action property:

• file - indicate here the URL of the file to be uploaded

Element events:

1. Upload Start - is triggered when upload is started

2. Upload End - is triggered when upload is ended (whether successfully or with error)

3. Error - is triggered if an error occurs during upload

Element states:

1. URL - URL of the uploaded file

2. Name - name of the uploaded file

3. Size - size of the uploaded file

4. Type - file type of the uploaded file

5. Error - error message in case the file upload resulted in an error

S3 Objects

This element lets you get the list of files from the S3 Bucket. Should placed on page to get access to element actions, events and states.

Element properties:

This plugin element has no properties.

Element actions:

1. Get all files from s3 - is used to get information about all the files from an S3 bucket or all the files from a certain folder on the bucket

Action properties:

• Folder name - the name of the folder on the S3 bucket you want to get the files from. If left empty, the action will get all the files from the bucket

Element events:

1. bucket's objects are loaded - is triggered once the Get all files from s3 action finished execution

Element states:

1. List of file urls - list of URLs of all the files on S3 bucket

2. List of filenames - list of file names of all the files on S3 bucket

3. Last Modified - list of last modified dates for all the files from S3 bucket

4. List of file size (MB) - list of file sizes for all the files on S3 bucket

Plugin actions

1. Delete file

This action should be used in order to delete one file from an S3 Bucket

Action properties:

1. Key - URL of the file to be deleted

2. Delete Files

This action should be used in order to delete a list of files from an S3 Bucket

Action properties:

1. Files List - list of files to be deleted

2. Using URLs - checkbox, check it if you want to pass into the 'Files List' property a list of file URLs

Workflow/settings Example

1. File uploader element example

   To work with the 'File uploader' element, place it on the page and configure the settings according to your requirements. Here's just one of many possible examples:

2. S3 Objects element example

Example workflow with 'S3 Objects' element.

Place a button on the page and give it a name (for example, 'Get Files'). Then trigger the following workflow on this button click:

After this action has been run, you will have access to file information (in the element states: List of file urls, List of filenames, Last Modified, and List of file size (MB)) for all the files that are currently located on S3 in the folder with the name 'MY_FOLDER'.

3. File Upload No GUI element example

In order to work with the 'File Upload No GUI' element, place it on the page, and, optionally, use some Bubble or other User Interface element in combination with this plugin element to make your design more user friendly. As an example, on our demo page it is used in combination with the Bubble File Uploader element. Then choose the right settings for the 'Title' and 'Unique file prefix format', and start using it.

4. Delete Files plugin action example

Place a button on the page and give it a name (for example, 'Delete Files'). Then trigger the following workflow on this button click:

After workflow has run, the indicated files will be deleted from the S3 Bucket.

Changelogs

Update: 12/29/2020 –

1. Changes to File uploader element:

• Added 'Folder name' property

• Added 'folder_name/uuid_filename' value for the 'Folder structure' property

2. Changes to S3 Objects element:

• Added 'Folder name' property to 'Get all files from s3' element action

3. Changes to File Upload No GUI element:

• Added 'Unique file prefix format' property

4. Fixed issue with special characters in file names in Safari

Update: 12/01/2021 -

• Fixed 'File Upload No GUI' element bug in case of multiple visual elements on page

Demo to preview the settings