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This is a sample set that includes function calculations for each Runtime combined with HTTP Trigger to achieve file upload and file download. Each example includes:

A public HTML page with a file selection box and upload button that lists uploaded files. Click on an uploaded file to download the file; support functions for file upload, download and enumeration.

We know that there are many methods and community libraries in different languages when dealing with HTTP protocol uploads and downloads, especially in the scenario of function calculation, developers often need to spend a lot of energy to learn and try. The purpose of this sample collection is to save developers' energy and time in screening and to provide each language with an effective and community best practice approach that can be put to use.

Currently supported Runtime include:

Nodejspythonphpjava

The Runtime supported by the program includes:

Dotnetcore

Runtime that you do not intend to support include:

Custom usage restrictions

Since the Body size limit of function calculation for both Request and Response of HTTP is 6m, this sample set is only suitable for scenarios where uploading and downloading files are less than 6m with the help of function calculation. For cases greater than 6m, you can consider the following methods:

Multipart upload, the file is divided into small pieces, and then spliced up after uploading; with the help of OSS, the file is uploaded to OSS first, the function downloads the file from OSS, and after processing, it is sent back to OSS; with the help of NAS, and the large file is placed on the NAS network disk, and the function can access the file of the NAS network disk just like reading and writing ordinary file system. Quickly start installing dependencies

Before you begin, make sure that the following tools are installed in the development environment:

Dockerfuncraftgitmake builds and starts the function

Clone the code:

Git clone https://github.com/vangie/fc-file-transfer

Local launch function:

$make start...HttpTrigger httpTrigger of file-transfer/nodejs was registered url: http://localhost:8000/2016-08-15/proxy/file-transfer/nodejs methods: ['GET',' POST'] authType: ANONYMOUSHttpTrigger httpTrigger of file-transfer/python was registered url: http://localhost:8000/2016-08-15/proxy/file-transfer/python methods: ['GET' 'POST'] authType: ANONYMOUSHttpTrigger httpTrigger of file-transfer/java was registered url: http://localhost:8000/2016-08-15/proxy/file-transfer/java methods: [' GET', 'POST'] authType: ANONYMOUSHttpTrigger httpTrigger of file-transfer/php was registered url: http://localhost:8000/2016-08-15/proxy/file-transfer/php methods: [' GET' 'POST'] authType: ANONYMOUSfunction compute app listening on port 8000!

The make start command invokes the instructions in the Makefile file to open the HTTP service on local port 8000 through fun local, and the console prints out the URL of each HTTP Trigger, the supported HTTP methods, and the authentication method.

Effect demonstration

Choose any of the above four URL addresses to open the sample page in the browser.

Interface description

All examples implement the following four HTTP interfaces:

GET / return the HTML page of the file upload Form GET / list returns the file list in the form of JSON array POST / upload uploads the file fileContent as the file field fileName as the file name field GET / download?filename=xxx returns the file content in application/octet-stream format.

In addition, in order to correctly calculate the relative path, if the access to the root path does not end with /, a 301 jump will be triggered, adding a / to the end of the URL.

The sample code nodejspythonphpjava in different languages has known problems with file size limits. There is a known problem with the fun local implementation. Files that are uploaded too large will automatically exit, and future versions will be fixed. To deploy online, you need to bind a custom domain name to use it, otherwise the HTML file will be forced to download in the browser instead of rendering directly.

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