i want to download and save an HTML file from the Internet. In another activity, I want to take this file and open it with Webview. I tried to save the file to the external storage, but the Play Store does not allow the use of this permission. Manage the external storage unless you have a very good reason to do so. Thanks for your help
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I've been searching for weeks on stackoverflow and google, but I wasn't able to find any good results.
I have a pdf file on my computer and I want to access that pdf file from an ios app, by clicking a link which will take me to that pdf file.
And when I modify that pdf file on my computer I want the link in the app to update with the latest version of that pdf file.
I thought of using a backend for storage such as Firebase storage but I had some issues with that.
How can I access that pdf file from an app? It doesn't have to be through a link, anything that will allow access with the latest version of the file is fine.
I appreciate any suggestions.
Thank You
The simplest way may be using a cloud storage such as Dropbox, Google Drive, One Drive...etc and get the public share link to that file. Then you can load the PDF in your iOS app using this link.
You can do this using web services API, You need to create simple webservice in backend (in any language for example PHP) to get the list of file with path to access in mobile app, and configure backend webservice code to your server (your computer, wherever you want to update files), So you can get every time updated data (files path) using webservice.
I have an app in which the user should be able to get a txt file from there external storage in order to upload to firebase_storage. The thing is, I don't know the path of the file, so I want the user to be able to choose this like they would be able to choose a pdf using file_picker or pick an image using image_picker? How would I be able to do this?
I figured out that I can use the flutter_document_picker and specify in that that I want a txt file for the device to get.
I'm using NSURLSessionDownloadTask to download some .mov files from a web and storing them in my app.
Now what I'd like to achieve is to
download ALL files of certain type (in this case .mov) available on the page, without having to specify every file URL
download files ONLY if they are not already stored in my app.
Is there any way to achieve this?
You would have to scrape that html page to get all the urls (.mov) you are looking for. Either you can use NSXMLParser if you want to write your own or you can google some library.
When you download a file, persist some metadata (eg. name or some unique identifier) either in SQLite or CoreData, so that you can check if the file has already been downloaded.
I am developing an iOS app that uses a large amount of images that are needed for animations for short videos. I want to save my application assets as static files in cloud and once they are needed download them using secure API call (either JSON, XML or any other alternative for that matter).
What is the best option for that. I have checked Parse, Dropbox, iCloud, Google Drive, but I am puzzled since I see only instructions for dynamic data that lets users access content they have created and not static assets.
What would be best option for that?
If you just want an easy way to serve static files I would take a look at Amazon S3. You can just upload files through the online console and then get the public URL to those files to use in your app. You can also use the S3 API to upload files through your web service or iOS app.
Hope this helps!
I'd go for Parse (basically because it is fast to learn and develop), you can create a table with the images and change the writing permissions if you are afraid somebody could modify the table.
Another option that you can check it's the special Config table so you can upload custom files (zip files i.e.) and download them in demand.
I have a website that shows galleries. Users can upload their own content from the web (by entering a URL) or by uploading a picture from their computer.
I am storing the URL in the database which works fine for the first use case but I need to figure out where to store the actual images if a user does a upload from their computer.
Is there any recommendation here or best practice on where I should store these?
Should I save them in the appdata or content folders? Should they not be stored with the website at all because it's user content?
You should NOT store the user uploads anywhere they can be directly accessed by a known URL within your site structure. This is a security risk as users could upload .htm file and .js files. Even a file with the correct extension can contain malicious code that can be executed in the context of your site by an authenticated user allowing server-side or client-side attacks.
See for example http://www.acunetix.com/websitesecurity/upload-forms-threat.htm and What security issues appear when users can upload their own files? which mention some of the issues you need to be aware of before you allow users to upload files and then present them for download within your site.
Don't put the files within your normal web site directory structure
Don't use the original file name the user gave you. You can add a content disposition header with the original file name so they can download it again as the same file name but the path and file name on the server shouldn't be something the user can influence.
Don't trust image files - resize them and offer only the resized version for subsequent download
Don't trust mime types or file extensions, open the file and manipulate it to make sure it's what it claims to be.
Limit the upload size and time.
Depending on the resources you have to implement something like this, it is extremely beneficial to store all this stuff in Amazon S3.
Once you get the upload you simply push it over to Amazon and pop the URL in your database as you're doing with the other images. As mentioned above it would probably be wise to open up the image and resize it before sending it over. This both checks it is actually an image and makes sure you don't accidentally present a full camera resolution image to an end user.
Doing this now will make it much, much easier if you ever have to migrate/failover your site and don't want to sync gigabytes of image assets.
One way is to store the image in a database table with a varbinary field.
Another way would be to store the image in the App_Data folder, and create a subfolder for each user (~/App_Data/[userid]/myImage.png).
For both approaches you'd need to create a separate action method that makes it possible to access the images.
While uploading images you need to verify the content of the file before uploading it. The file extension method is not trustable.
Use magic number method to verify the file content which will be an easy way.
See the stackoverflow post and see the list of magic numbers
One way of saving the file is converting it to binary format and save in our database and next method is using App_Data folder.
The storage option is based on your requirement. See this post also
Set upload limit by setting maxRequestLength property to Web.Config like this, where the size of file is specified in KB
<httpRuntime maxRequestLength="51200" executionTimeout="3600" />
You can save your trusted data just in parallel of htdocs/www folder so that any user can not access that folder. Also you can add .htaccess authentication on your trusted data (for .htaccess you should kept your .htpasswd file in parallel of htdocs/www folder) if you are using apache.